µchiller 3 - Refroidisseur Carel - Free user manual and instructions

USER MANUAL µchiller 3 Carel

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IMPORTANT WARNINGS

BEFORE INSTALLING OR HANDLING THE DEVICE PLEASE CAREFULLY READ AND FOLLOW THE INSTRUCTIONS DESCRIBED IN THIS MANUAL.

This device has been manufactured to operate risk-free for its specific purpose, as long as:

it is installed, operated and maintained according to the instructions contained in this manual;

the environmental conditions and the voltage of the power supply correspond to those specified.

All other uses and modifications made to the device that are not authorised by the manufacturer are considered incorrect.

Liability for injury or damage caused by the incorrect use of the device lies exclusively with the user.

Please note that this unit contains powered electrical devices and therefore all service and maintenance operations must be performed by specialist and qualified personnel who are aware of the necessary precautions.

Disconnect the unit from the mains power supply before accessing any internal parts.

INFORMATION FOR USERS ON THE CORRECT HANDLING OF WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)

In reference to European Union directive 2002/96/EC issued on 27 January 2003 and the related national legislation, please note that:

1. WEEE cannot be disposed of as municipal waste and such waste must be collected and disposed of separately;
2. The public or private waste collection systems defined by local legislation must be used. In addition, the equipment can be returned to the distributor at the end of its working life when buying new equipment.
3. The equipment may contain hazardous substances: the improper use or incorrect disposal of such may have negative effects on human health and on the environment;
4. The symbol (crossed-out wheeled bin) shown on the product or on the packaging and on the instruction sheet indicates that the equipment has been introduced onto the market after 13 August 2005 and that it must be disposed of separately;
5. In the event of illegal disposal of electrical and electronic waste, the penalties are specified by local waste disposal legislation.

CONTENTS

1. INTRODUCTION....5

1.1 General description .... 5
1.2 User interface 5
1.3 Programming procedure....6

2. PGDO TERMINAL 6

2.1 Passwords and levels of access....6
2.2 Type of connectors....6

3. APPLICATIONS....7

3.1 AIR/AIR units, single circuit 7
3.2 AIR/AIR units, two circuits 7
3.3 AIR/AIR units, two circuits, 1 condenser fan circuit ....8
3.4 AIR/AIR heat pumps, single circuit 8
3.5 AIR/AIR heat pumps, two circuits 9
3.6 AIR/AIR heat pumps, two circuits, 1 condenser fan circuit ....9
3.7 AIR/AIR chillers, single circuit....10
3.8 AIR/AIR chillers, two circuits, 2 condenser fan circuits and 2 evaporators 10
3.9 AIR/WATER chillers, two circuits, 1 condenser fan circuit....11
3.10 AIR/WATER heat pumps, single circuit 11
3.11 AIR/WATER heat pumps, 2 condenser fan circuits .... 12
3.12 AIR/WATER heat pumps, two circuits, 1 condenser fan circuit .... 12
3.13 WATER/WATER chillers, single circuit.... 13
3.14 WATER/WATER chillers, two circuits.... 13
3.15 WATER/WATER chillers, two circuits, 2 evaporators....14
3.16 WATER/WATER heat pumps with reversal on the refrigerant circuit, single circuit.... 14
3.17 WATER/WATER heat pumps with reversal on the refrigerant circuit, two circuits.... 15
3.18 WATER/WATER heat pumps with reversal on the refrigerant circuit, two circuits, 1 evaporator.... 15
3.19 WATER/WATER heat pumps with reversal on the water circuit, single circuit 16
3.20 WATER/WATER heat pumps with reversal on the water circuit, two circuits, H02=1 and H21=4 16
3.21 WATER/WATER heat pumps with reversal on the water circuit, two circuits, 1 evaporator H02= 1 and H21= 4 ...... 17
3.22 Air-cooled condensing unit without reverse cycle, single circuit 17
3.23 Air-cooled condensing unit without reverse cycle, two circuits 18
3.24 Reverse-cycle air-cooled condensing unit, single circuit 18
3.25 Reverse-cycle air-cooled condensing unit, two circuits with condenser fan circuit 19
3.26 Water-cooled condensing unit without reverse cycle, single circuit 19
3.27 Water-cooled condensing unit without reverse cycle, two circuits 20
3.28 Reverse-cycle water-cooled condensing unit, single circuit.... 20
3.29 Reverse-cycle water-cooled condensing unit, two circuits....21

4. PARAMETERS 22

4.1 Menu layout....22
4.2 List of parameters with the pLD user interface 23
4.3 List of parameters with the pGD user interface....25

5. CONNECTIONS 41

6. DESCRIPTION OF THE MAIN FUNCTIONS....43

6.1 Control set point 43
6.2 Inlet-room temperature control 44

7. DESCRIPTION OF OPERATION....45

7.1 Outlet temperature control 45
7.2 Differential Temperature Control 47
7.3 Condensing unit control 47
7.4 Compressor rotation....49
7.5 TANDEM - TRIO compressor rotation 50
7.6 Compressor safety times....50
7.7 Pumpdown management....52
7.8 Main pump management....53
7.9 Pump rotation 53
7.10 Electric heaters....54
7.11 Selecting the operating mode....55
7.12 ON/OFF time bands 55
7.13 Antifreeze control....56
7.14 Condenser - evaporator control 57
7.15 Prevent function....59
7.16 Low noise function....59
7.17 Start with hot condenser....59

7.18 Defrost control in air/water – Air/air units....60
7.19 Types of defrost....60
7.20 Defrosting a circuit with time / temperature control....61
7.21 Defrosting a circuit with control from external contact 62
7.22 Manual defrost....63
7.23 Defrost control ON REVERSE-CYCLE water/water units....63
7.24 Activating a defrost cycle....63
7.25 Running a defrost 63
7.26 Ending a defrost cycle 63

8. MAP OF OUTPUTS 64

8.1 Air / air units....64
8.2 Air / water units....66
8.3 Water / water units....68
8.4 Air-cooled condensing units 71

9. ALARMS....73

9.1 Table of alarms....73
9.2 Type of alarm reset....76
9.3 Alarm log 76
9.4 Flow switch alarm....76
9.5 Circulating pump thermal overload alarm....77
9.6 Condenser fan thermal overload alarm 77
9.7 Antifreeze alarm 77

10. CONNECTIONS, ACCESSORIES AND OPTIONS 78

1. CODES....78
2. TECHNICAL SPECIFICATIONS....78

1. Introduction

1.1 General description

The C^3 is a new compact CAREL electronic controller, measuring the size of a normal thermostat, for the complete management of chillers and heat pumps: it can control air-air, air-water, water-water and condensing units.

Main functions

• Temperature control for air/air units, air/water-cooled chillers/heat pumps, with two circuits and up to 6 steps, with and without reversal on the water/refrigerant circuit;
  • condenser control in two circuits with up to 6 steps on air/water-cooled units, with and without reversal on the water/refrigerant circuit;
  • defrost management by time and/or by temperature or pressure;
• fan speed control;
  • complete alarm management;
  • time band management;

Advanced functions

• sliding defrost
• functions to prevent high condensing pressure/temperature, low evaporator pressure/temperature, antifreeze
  • control
  • management of tandem, trio and semi-hermetic compressors
• pump-down
• part-winding start

Driver functions

• Electronic expansion valve management.

Devices controlled

• Compressor;
• condenser fans;
  • evaporator fan (air-source units)
• reversing valve;
• outlet fan (air-air);
• antifreeze heater;
• support heaters;
• alarm signal device;

• water pumps for the evaporator and/or condenser (water-source units);

Programming

CAREL offers the possibility to configure all the unit parameters not only from the keypad on the front panel, but also using a hardware key or via a serial line.

1.2 User interface

pLD large terminal

The display has 4 digits plus decimal point. In normal operation, the value shown on the display corresponds to the temperature read by the control probe, for example the evaporator water inlet temperature (on water chillers) or alternatively the room temperature, on direct expansion units.

Prg button: enters the parameters menu; if already in the menu goes back one level at a time until reaching the main screen Amber LED On - parameters menu Off - other menu Up button: enters the password-protected menu and scrolls the parameters Amber LED On - pump on Off - pump off Flashing - pump alarm Heat button: enters the parameters menu; if already in the menu goes back one level at a time until reaching the main screen Green LED On = parameters menu Off = other menu Alarm button: displays the alarm menu Red LED On = alarm active Off = no alarm Cool button: activates HP mode Green LED On - HP mode Off - chiller mode On/off button: switches the unit on/off Red LED On - unit on Off - unit off Sel button: selects the chosen parameter and confirms the changes Green LED On - main menu Off - other menu Down button: enters the password-protected menu and scrolls the parameters Green LED On - compressors on Off - compressors off Flashing = compressor alarm

Fig. 1.a

1.3 Programming procedure

1) press up or down
2) press Sel
3) enter the password using up or down
4) press Sel to confirm

If the password is correct, the parameters menu automatically appears; if the password is wrong, the value 0 is displayed.

Repeat the operation by repeating the procedure or press Prg to exit.

2. pGD0 terminal

The display covers 4 rows by 20 characters. In normal operation, the display shows the evaporator inlet and outlet temperatures, the unit status (ON/OFF) and the mode (cooling/heating).

The up and down buttons can be used to immediately enter in the user menu, set point, ON/OFF and COOLING/HEATING mode.

Entering the password in the screen following is possible enter in programming of all the parameters.

Alarm button: enters alarms menu with single-pressing; Red LED On — enable alarm Off — disable alarm Up button: enters the user menu and changes the selection Prg button: enters the parameters menu Amber LED On = main menu Off — other menu Enter button: confirms the selection or the settings Esc button: returns to the previous menu Green LED: always on Down button: enters the user menu and changes the selection

Fig. 1.b

2.1 Passwords and levels of access

The user interface has the parameters organised into three distinct levels of access, each of which containing a different number of visible parameters: free access: access to the screens displaying the inputs and outputs, unit on/off, set point, enter password to access the protected parameters. user level: (password 22), all the free access parameters plus the main control parameters, maintenance parameters, alarms. manufacturer level: (password 66), complete access to the unit configuration parameters, from the type of devices controlled to the definition of the control parameters.

The parameters are organised by uniform groups accessible from specific sliding menus.

The following diagram shows the method for accessing the various groups of parameters and their layout.

From inside a group of parameters, pressing [Esc] moves the cursor to the sliding menu for selecting the parameters, pressing [Prog] moves to the main menu.

2.2 Type of connectors

The connectors and the cables can be purchased separately from CAREL (MCH3CON**) or directly from the manufacturers, Molex and Phoenix. For the crimping of the contacts use the special Molex tool code 69008-0724.

Mini-fit terminals

Number of connectors	Molex code of the connector	Number of pins	Molex code of the contact	Cable cross-section allowed in AWG	Cable cross-section allowed in mm2
2	39-01-2140	14	39-00-003839-00-0046	AWG18 to 24AWG22 to 28	1.00 to 0.210.5 to 0.10
1	39-01-2060	6
1	39-01-2080	8
1	39-01-2100	10
1	39-01-2100	10	39-00-0077	AWG16	1.50
2	39-01-2120	12	39-00-0077	AWG16	1.50

Plug-in terminals

Number of connectors	Phoenix code of the connector	Number of pins	Cable cross-section allowed in AWG	Cable cross-section allowed in mm2
2 MC 1,5/3-ST-3,81 3	AWG18-24	1.00	to 0.21
1 MC 1,5/2-ST-3,81 2	AWG18-24	1.00	to 0.21

3. Applications

3.1 AIR/AIR units, single circuit

graph TD
    A["Termico ventilatore condensatore / Condenser fan overload"] --> B["Ventilatore/ Fan"]
    B --> C["Sonda condensatore Condenser probe"]
    C --> D["B3/4"]
    D --> E["Evaporatore Evaporator"]
    E --> F["Compressor 1 Circ.1"]
    F --> G["Alta pressione High pressure"]
    F --> H["Bassa pressione Low pressure"]
    F --> I["Termico compressore Compressor overload"]
    I --> J["Compressor 2 Circ.1 Compressor 2"]
    J --> K["Compressor 3 Circ.1 Compressor3"]
    K --> L["Sonda ambient Probe B1"]
    D --> M["Sonda mandata Supply probe B2"]
    E --> N["Resistenza di riscaldamento Electrical heater"]
    E --> O["Termico ventilatore di mandata Supply fan overload"]
    O --> P["Ventilatore di mandata Supply fan"]

Fig. 3.a.a

3.2 AIR/AIR units, two circuits

graph TD
    A["Termico ventilatore condensatore 1\nCondenser fan overload 1"] --> B["Ventilatore / Fan"]
    B --> C["Sonda condensatore\nCondenser probe"]
    C --> D["B3/4"]
    D --> E["Resistenze di riscaldamento 1 e 2\nAntifreeze heaters 1 and 2"]
    E --> F["Termico ventilatore condensatore 2\nCondenser fan overload 2"]
    F --> G["Sonda mandata\nSupply probe B2"]
    G --> H["B7/8"]
    H --> I["Ventilatore / Fan"]
    I --> J["Sonda condensatore\nCondenser probe"]
    J --> K["B7/8"]
    K --> L["Evaporatore 1\nEvaporator 1"]
    L --> M["Termico ventilatore di mandata\nSupply fan overload"]
    M --> N["Termico compressore 1\nCompressor 1 - Circ.1"]
    N --> O["Alta pressione 1\nHigh pressure 1"]
    N --> P["Bassa pressione 1\nLow pressure 1"]
    N --> Q["Termico compressore 1\nCompressor overload 1"]
    Q --> R["Compressor 2_Circ.1"]
    R --> S["Compressor 3_Circ.1"]
    S --> T["Compressor 3 Compressor3"]
    T --> U["B1"]
    U --> V["Sonda ambiente Ambient probe"]
    V --> W["Bassa pressione 2\nLow pressure 2"]
    V --> X["Termico compressore 2\nCompressor overload 2"]
    X --> Y["Compressor 2_Circ.2"]
    Y --> Z["Alta pressione 2\nHigh pressure 2"]
    Y --> AA["Compressor 3_Circ.2"]

Fig. 3.a.b

3.3 AIR/AIR units, two circuits, 1 condenser fan circuit

graph TD
    A["Sonda condensatore 1 Condenser 1 probe"] --> B["Termico ventilatore condensatore Condenser fan overload"]
    B --> C["Sonda condensatore 2 Condenser 2 probe"]
    C --> D["Condenser fan overload"]
    D --> E["B3/4"]
    D --> F["B7/8"]
    E --> G["Ventilatore / Fan"]
    F --> H["Sonda mandata Supply probe B2"]
    G --> I["Resistenze di riscaldamento 1 e 2 Antifreeze heaters 1 and 2"]
    H --> I
    I --> J["Evaporatore 1 Evaporator 1"]
    J --> K["Compressor 1_Circ. 1"]
    K --> L["Compressor 1_Circ. 1"]
    L --> M["Alta pressione 1 High pressure 1"]
    L --> N["Bassa pressione 1 Low pressure 1"]
    N --> O["Termico comp 1 Comp. 1 overload"]
    O --> P["Compressor 2_Circ. 1 Compressor 2"]
    P --> Q["Compressor 2_Circ. 1"]
    Q --> R["Alta pressione 2 High pressure 2"]
    R --> S["Termico comp 2 Comp. 2 overload"]
    S --> T["Compressor 2_Circ. 2 Compressor 2"]
    T --> U["B1"]
    U --> V["Sonda ambiente Ambient probe"]
    V --> W["Ventilatore di mandata Supply fan"]
    W --> X["Compressor 1 Compressor 1"]
    X --> Y["Bassa pressione 2 Low pressure 2"]
    Y --> Z["Compressor 1_Circ. 2"]
    Z --> AA["Alta pressione 2 High pressure 2"]
    AA --> AB["Termico comp 2 Compressor 2"]

Fig. 3.a.c

3.4 AIR/AIR heat pumps, single circuit

Termico ventilatore condensatore / Condenser fan overload

graph TD
    A["Ventilatore / Fan"] --> B["Sonda condensatore Condenser probe B3/4"]
    B --> C["Valvola inversione Reversing valve"]
    C --> D["Compressor 1 Circ. 1"]
    D --> E["Alta pressione High pressure"]
    D --> F["Bassa pressione Low pressure"]
    D --> G["Termico comp. Comp. overload"]
    G --> H["Compressor 2 Circ. 1"]
    H --> I["Compressor 2"]
    I --> J["Valvola inversione Reversing valve"]
    J --> K["Resistenze di riscaldamento Antifreeze heaters"]
    K --> L["Sonda manda Supply probe B2"]
    L --> M["Evaporatore Evaporator"]
    M --> N["Termico ventilatore di mandata Supply fan overload"]
    N --> O["Ventilatore di mandata Supply fan"]
    O --> P["Sonda ambiente Ambient probe B1"]

Fig. 3.a.d

3.5 AIR/AIR heat pumps, two circuits

graph TD
    A["Termico ventilatore condensatore 1\nCondenser fan overload 1"] --> B["Sonda condensatore\nCondenser probe"]
    B --> C["B3/4"]
    C --> D["Valvola inversione 1\nReversing valve 1"]
    D --> E["Compressor 1_Circ.1"]
    E --> F["Alta pressione 1\nHigh pressure 1"]
    E --> G["Bassa pressione 1\nLow pressure 1"]
    E --> H["Termico comp 1\nComp. 1 overload"]
    H --> I["Compressor 2_Circ.1"]
    I --> J["Valvola inversione 2\nReversing valve 2"]
    J --> K["Resistenze di riscaldamento 1 e 2\nAntifreeze heaters 1 and 2"]
    K --> L["Valvola inversione 1\nReversing valve 1"]
    L --> M["Compressor 1_Circ.1"]
    M --> N["B1"]
    N --> O["Sonda ambiente Ambient probe"]
    O --> P["Valvola inversione 2\nReversing valve 2"]
    P --> Q["Resistenze di riscaldamento 1 e 2\nAntifreeze heaters 1 and 2"]
    Q --> R["Valvola inversione 1\nReversing valve 1"]
    R --> S["Compressor 1_Circ.2"]
    S --> T["Bassa pressione 2\nLow pressure 2"]
    S --> U["Alta pressione 2\nHigh pressure 2"]
    S --> V["Termico comp 2\nComp. 2 overload"]
    V --> W["Compressor 2_Circ.2"]
    W --> X["B7/8"]
    X --> Y["Valvola inversione 2\nReversing valve 2"]
    Y --> Z["Resistenze di riscaldamento 1 e 2\nAntifreeze heaters 1 and 2"]
    Z --> AA["Valvola inversione 1\nReversing valve 1"]
    AA --> AB["Sonda mandata Supply probe B2"]
    AB --> AC["Valvola inversione 1\nReversing valve 1"]
    AC --> AD["Sonda mandata Supply probe B2"]

Fig. 3.a.e

3.6 AIR/AIR heat pumps, two circuits, 1 condenser fan circuit

graph TD
    A["Sonda condensatore 1\nCondenser 1 probe"] --> B["B3/4"]
    B --> C["Ventilatore Fan"]
    C --> D["Sonda mandata\nSupply probe\nB2"]
    D --> E["Resistenze di riscaldamento 1 e 2\nAntifreeze heaters 1 and 2"]
    E --> F["Evaporatore 1\nEvaporator 1"]
    F --> G["Valvola inversione 1\nReversing valve 1"]
    G --> H["Compressor 1\nCompressor 1 - Circ.1"]
    H --> I["Alta pressione 1\nHigh pressure 1"]
    H --> J["Bassa pressione 1\nLow pressure 1"]
    H --> K["Termico comp 1\nComp. 1 overload"]
    K --> L["Compressor 2\nCompressor 2 - Circ.1"]
    L --> M["B1"]
    M --> N["Sonda ambiente\nAmbient probe"]
    N --> O["Compressor 1\nCompressor 1 - Circ.2"]
    O --> P["Bassa pressione 2\nLow pressure 2"]
    O --> Q["Alta pressione 2\nHigh pressure 2"]
    O --> R["Termico comp 2\nComp. 2 overload"]
    R --> S["Compressor 2\nCompressor 2 - Circ.2"]

Fig. 3.a.f

+030220431 rel 1.7 03/06/2014 9

3.7 AIR/WATER chillers, single circuit

Termico ventilatore condensatore / Condenser fan overload

graph TD
    A["Ventilatore/Fan"] --> B["Sonda condensatore/Condenser probe B3/4"]
    B --> C["Flussostato Flow switch"]
    C --> D["Sonda uscita evaporatore Outlet evaporator probe B2"]
    D --> E["Evaporatore Evaporator"]
    E --> F["Resistenza antigelo Antifreeze heater"]
    F --> G["Sonda ingresso evaporatore Inlet evaporator probe B1"]
    G --> H["Pompa dell'acqua Water pump"]
    H --> I["Compressor 1 - Circ.1 Compressor 1"]
    I --> J["Alta pressione High pressure"]
    I --> K["Bassa pressione Low pressure"]
    K --> L["Termico comp. Comp. overload"]
    L --> M["Compressor 2 - Circ.1 Compressor 2"]

Fig. 3.a.g

3.8 AIR/WATER chillers, two circuits, 2 condenser fan circuits and 2 evaporators

graph TD
    A["Termico ventilatore condensatore 1\nCondenser fan overload 1"] --> B["Sonda condensatore1\nCondenser 1 probe"]
    B --> C["B3/4"]
    C --> D["Evaporatore 1\nEvaporator 1"]
    D --> E["Resistenza antigelo 1\nAntifreeze heater 1"]
    D --> F["Resistenza antigelo 2\nAntifreeze heater 2"]
    D --> G["Evaporatore 2\nEvaporator 2"]
    G --> H["Compressor 1_Circ.1"]
    H --> I["Alta pressione 1\nHigh pressure 1"]
    H --> J["Bassa pressione 1\nLow pressure 1"]
    H --> K["Termico comp.1\nComp.1 overload"]
    K --> L["Compressor 2_Circ.1"]
    L --> M["Flussostato\nFlow switch"]
    M --> N["Sonda temp. di mandata\nOutlet temp. probe\nB5"]
    N --> O["Sonda uscita evaporatore 1\nOutlet evaporator probe 1"]
    N --> P["Sonda uscita evaporatore 2\nOutlet evaporator probe 2"]
    P --> Q["Compressor 1_Circ.1"]
    Q --> R["B1"]
    R --> S["Pompa dell'acqua\nWater pump"]
    S --> T["Compressor 2_Circ.2"]
    T --> U["Bassia pressione 2\nLow pressure 2"]
    T --> V["Alta pressione 2\nHigh pressure 2"]
    V --> W["Termico comp. 2\nComp. 2 overload"]
    W --> X["Compressor 2_Circ.2"]
    X --> Y["B7/8"]
    Y --> Z["Compressor 1_Circ.2"]
    Z --> AA["Bassa pressione 2\nLow pressure 2"]
    Z --> AB["Alta pressione 2\nHigh pressure 2"]
    AB --> AC["Termico ventilatore condensatore 2\nCondenser fan overload 2"]

Fig. 3.a.h

3.9 AIR/WATER chillers, two circuits, 1 condenser fan circuit

graph TD
    A["Sonda condensatore 1 Condenser 1 probe"] --> B["Termico ventilatore condensatore 1 Condenser fan overload 1"]
    B --> C["Ventilatore/Fan 1"]
    C --> D["Flussostato Flow switch"]
    D --> E["Sonda temp. di mandata Outlet temp. probe B5"]
    E --> F["Sonda uscita evaporatore 1 Outlet evaporator probe 1"]
    F --> G["Sonda uscita evaporatore 2 Outlet evaporator probe 2"]
    G --> H["Evaporatore 1 Evaporator 1"]
    H --> I["Resistenza antigelo 1 Antifreeze heater 1"]
    I --> J["Resistenza antigelo 2 Antifreeze heater 2"]
    J --> K["Evaporatore 2 Evaporator 2"]
    K --> L["Compressor 1 Circ.1 Compressor 1"]
    L --> M["Alta pressione 1 High pressure 1"]
    M --> N["Bassa pressione 1 Low pressure 1"]
    N --> O["Termico comp. 1 Comp. 1 overload"]
    O --> P["Compressor 2 Circ.1 Compressor 2"]
    P --> Q["Compressor 3 Circ.1 Compressor 3"]
    Q --> R["Compressor 3 Compressor 3"]
    R --> S["Pompa dell'acqua Water pump"]
    S --> T["Sonda ingresso evaporatore Inlet evaporator probe B1"]
    T --> U["Sonda uscita evaporatore 1 Outlet evaporator probe 1"]
    U --> V["Sonda condensatore 2 Condenser 2 probe"]
    V --> W["Compressor 1 Circ.2 Compressor 1"]
    W --> X["Bassa pressione 2 Low pressure 2"]
    X --> Y["Alta pressione 2 High pressure 2"]
    Y --> Z["Termico comp. 2 Comp. 2 overload"]
    Z --> AA["Compressor 2 Circ.2 Compressor 2"]
    AA --> AB["Compressor 3 Circ.2 Compressor 3"]

Fig. 3.a.i

3.10 AIR/WATER heat pumps, single circuit

Fig. 3.a.l.

3.11 AIR/WATER heat pumps, 2 condenser fan circuits

graph TD
    A["Termico ventilatore condensatore 1\nCondenser fan overload 1"] --> B["Sonda condensatore 1/Condenser 1 probe"]
    B --> C["B3/4"]
    C --> D["Evaporatore 1\nEvaporator 1\nValvola inversionione 1\nReversing valve 1"]
    D --> E["Compressor 1"]
    E --> F["Alta pressione 1\nHigh pressure 1"]
    F --> G["Bassa pressione 1\nLow pressure 1"]
    G --> H["Termico comp. 1\nComp. 1 overload"]
    H --> I["Compressor 2_Circ.1\nCompressor 2"]
    I --> J["Compressor 3_Circ.1\nCompressor 3"]
    J --> K["Flussostato Flow switch"]
    K --> L["Sonda temp. di mandata\nOutlet temp. probe B5"]
    L --> M["Sonda uscita evaporatore 1\nOutlet evaporator probe 1"]
    M --> N["Sonda uscita evaporatore 2\nOutlet evaporator probe 2"]
    N --> O["Resistenza antigelo 1\nAntifreeze heater 1"]
    O --> P["Resistenza antigelo 2\nAntifreeze heater 2"]
    P --> Q["Pompa dell'acqua Water pump"]
    Q --> R["Sonda ingresso evaporatore Inlet evaporator probe B1"]
    R --> S["Compressor 1_Circ.2\nCompressor 1"]
    S --> T["Bassa pressione 2\nLow pressure 2"]
    T --> U["Alta pressione 2\nHigh pressure 2"]
    U --> V["Compressor 2_Circ.2\nCompressor 2"]
    V --> W["Compressor 3_Circ.2\nCompressor 3"]
    W --> X["Compressor 3_Circ.1\nCompressor 3"]
    X --> Y["Compressor 2_Circ.1\nCompressor 2"]
    Y --> Z["Compressor 2_Circ.2\nCompressor 2"]
    Z --> AA["Compressor 2_Circ.2\nCompressor 2"]
    AA --> AB["Compressor 2_Circ.2\nCompressor 2"]
    AB --> AC["Compressor 2_Circ.2\nCompressor 2"]
    AC --> AD["Compressor 2_Circ.2\nCompressor 2"]
    AD --> AE["Compressor 2_Circ.2\nCompressor 2"]
    AE --> AF["Compressor 2_Circ.2\nCompressor 2"]
    AF --> AG["Compressor 2_Circ.2\nCompressor 2"]
    AG --> AH["Compressor 2_Circ.2\nCompressor 2"]
    AH --> AI["Compressor 2_Circ.2\nCompressor 2"]
    AI --> AJ["Compressor 2_Circ.2\nCompressor 2"]
    AJ --> AK["Compressor 2_Circ.2\nCompressor 2"]
    AK --> AL["Compressor 2_Circ.2\nCompressor 2"]
    AL --> AM["Compressor 2_Circ.2\nCompressor 2"]
    AM --> AN["Compressor 2_Circ.2\nCompressor 2"]

Fig. 3.a.m.

3.12 AIR/WATER heat pumps, two circuits, 1 condenser fan circuit

graph TD
    A["Sonda condensatore 1/Condenser1 probe"] --> B["B3/4 Termico ventilatore condensatore 1 B7/8 Condenser fan overload"]
    B --> C["Flussostato Flow switch"]
    C --> D["Sonda temp. di mandata Outlet temp. probe"]
    D --> E["B5"]
    E --> F["Sonda uscita evaporatore 1 Outlet evaporator probe 1"]
    F --> G["B2"]
    G --> H["Sonda uscita evaporatore 2 Outlet evaporator probe 2"]
    H --> I["B6"]
    I --> J["Resistenza antigelo 1 Antifreeze heater 1"]
    J --> K["Resistenza antigelo 2 Antifreeze heater 2"]
    K --> L["Valvola inversione 1 Reversing valve 1"]
    L --> M["Compressor 1 Compressor 1 - Circ.1"]
    M --> N["Alta pressione 1 High pressure 1"]
    M --> O["Bassa pressione 1 Low pressure 1"]
    M --> P["Termico comp. 1 Comp. 1 overload"]
    P --> Q["Compressor 2 Compressor 2 - Circ.1"]
    Q --> R["Pompa dell'acqua Water pump"]
    R --> S["Sonda ingresso evaporatore inlet evaporator probe B1"]
    S --> T["Compressor 1 Compressor 1 - Circ.2"]
    T --> U["Bassa pressione 2 Low pressure 2"]
    T --> V["Alta pressione 2 High pressure 2"]
    V --> W["Termico comp. 2 Comp. 2 overload"]
    W --> X["Compressor 2 Compressor 2 - Circ.2"]

Fig. 3.a.n

3.13 WATER/WATER chillers, single circuit

graph TD
    A["Sonda temp. acqua cond. Water cond. temp. probe"] --> B["Condensatore Condenser"]
    B --> C["Avaporatore Evaporator"]
    C --> D["Flussostato Flow switch"]
    D --> E["Sonda uscita evaporatore Outlet evaporator probe B2"]
    C --> F["Resistenza antigelo Antifreeze heater"]
    F --> G["Sonda ingresso evaporatore Inlet evaporator probe B1"]
    G --> H["Pompa dell'acqua Water pump"]
    B --> I["Compressor 1_Circ.1 Compressor 1"]
    I --> J["Alta pressione High pressure Termico comp./Comp. overload"]
    I --> K["Bassa pressione Low pressure"]
    I --> L["Compressor 2_Circ.1 Compressor 2"]

Fig. 3.a.o.

3.14 WATER/WATER chillers, two circuits

graph TD
    A["Sonda temp. acqua cond. 1 Water cond. 1 temp. probe"] --> B["Condensatore1 Condenser 1"]
    B --> C["Resistenza antigelo 1 Antifreeze heater 1"]
    C --> D["Evaporatore/Evaporator"]
    D --> E["Compressor 1 Circ.1"]
    E --> F["Alta pressione 1 High pressure 1"]
    E --> G["Bassa pres.1 Low pressure1"]
    G --> H["Termicocomp.1 Comp.1 overload"]
    H --> I["Compressor 2_Circ.1 Compressor 2"]
    I --> J["Pompa dell'acqua Water pump"]
    D --> K["Flussostato Flow switch"]
    K --> L["Sonda uscita evaporatore 1 Outlet evaporator probe 1"]
    L --> M["B2"]
    M --> N["Condensatore 2 Condenser 2"]
    N --> O["B7"]
    O --> P["Sonda temp. acqua cond. 2 Water cond. 2 temp. probe."]
    D --> Q["Compressor 1 Compressor 1 - Circ.2"]
    Q --> R["B1"]
    R --> S["Bassa pres. 2 Low pressure 2"]
    S --> T["Termico comp.2 Comp. 2 overload"]
    T --> U["Pompa dell'acqua Water pump"]
    Q --> V["Compressor 1 Compressor 1 - Circ.2"]
    V --> W["Alta pressione 2 High pressure 2"]

Fig. 3.a.p.

3.15 WATER/WATER chillers, two circuits, 2 evaporators

graph TD
    A["Sonda temp. acqua cond. 1\nWater cond. 1\ntemp. probe"] --> B["Condensatore 1\nCondenser 1"]
    B --> C["Compressor 1_Circ.1"]
    C --> D["Alta pressione 1\nHigh pressure 1"]
    D --> E["Bassa pres. 1\nLow pressure 1"]
    E --> F["Termico comp.1\nComp.1 overload"]
    F --> G["Compressor 2_Circ.1"]
    G --> H["Pompa dell'acqua\nWater pump"]
    H --> I["Flussostato Flow switch"]
    I --> J["Sonda temp. di mandata\nOutlet temp. probe\nB5"]
    J --> K["Sonda uscita evaporatore 1\nOutlet evaporator probe 1"]
    K --> L["Sonda uscita evaporatore 2\nOutlet evaporator probe 2"]
    L --> M["Resistenza antigelo 1\nAntifreeze heater 1"]
    M --> N["Resistenza antigelo 2\nAntifreeze heater 2"]
    N --> O["Condensatore 2\nCondenser 2"]
    O --> P["Compressor 1_Circ.2"]
    P --> Q["Bassa pres. 2\nLow pressure 2"]
    Q --> R["Alta pressione 2\nHigh pressure 2"]
    R --> S["Termico comp. 2\nComp. 2 overload"]
    S --> T["Compressor 2_Circ.2\nCompressor 2^-"]

Fig. 3.a.q.

3.16 WATER/WATER heat pumps with reversal on the refrigerant circuit, single circuit

graph TD
    A["Sonda condensatore Condenser probe"] --> B["Condensatore Condenser"]
    B --> C["Valvola inversione Reversing valve"]
    C --> D["Compressor 1_Circ.1 Compressor 1"]
    D --> E["Alta pressione High pressure"]
    D --> F["Bassa pressione Low pressure"]
    F --> G["Termico comp. Comp. overload"]
    G --> H["Compressor 2_Circ.1 Compressor 2"]
    H --> I["Pompa dell'acqua Water pump"]
    J["Flussostato Flow switch"] --> K["B2 Sonda uscita evaporatore Outlet evaporator probe"]
    L["Resistenza antigelo Antifeeze heater"] --> M["B1 Sonda ingresso evaporatore Inlet evaporator probe"]
    N["Pompa dell'acqua Water pump"] --> O["Pompa dell'acqua Water pump"]

Fig. 3.a.r.

3.17 WATER/WATER heat pumps with reversal on the refrigerant circuit, two circuits

graph TD
    A["Sonda temp. acqua cond. 1 Water cond. 1 temp. probe"] --> B["Condensatore 1 Condenser 1"]
    B --> C["Resistenza antigelo 1 Antifreeze heater 1"]
    C --> D["Valvola inversione 1 Reversing valve 1"]
    D --> E["Compressor 1_Circ.1"]
    E --> F["Alta pressione 1 High pressure 1"]
    E --> G["Bassa pressione 1 Low pressure 1"]
    G --> H["Termico comp. 1 Comp. 1 overload"]
    H --> I["Compressor 2_Circ.1"]
    I --> J["Pompa dell'acqua Water pump"]
    K["Flussostato Flow switch"] --> L["Sonda uscita evaporatore Outlet evaporator probe"]
    L --> M["Sonda uscita evaporatore 1 Outlet evaporator probe 1"]
    M --> N["Sonda uscita evaporatore 2 Outlet evaporator probe 2"]
    N --> O["Evaporatore 1 Evaporator 1"]
    O --> P["Valvola inversione 2 Reversing valve 2"]
    P --> Q["Sonda ingresso evaporatore inlet evaporator probe B1"]
    Q --> R["Compressor 1_Circ.2"]
    R --> S["Bassa pressione 2 Low pressure 2"]
    R --> T["Alta pressione 2 High pressure 2"]
    T --> U["Termico comp. 2 Comp. 2 overload"]
    U --> V["Compressor 2_Circ.2 Compressor 2"]
    V --> W["Pompa dell'acqua Water pump"]
    X["Sonda temp. acqua cond. 2 Water cond. 2 temp. probe"] --> Y["Sonda temp. acqua cond. 1 Water cond. 1 temp. probe"]
    Z["Sonda temp. acqua cond. 2 Water cond. 2 temp. probe"] --> AA["Sonda temp. acqua cond. 1 Water cond. 1 temp. probe"]

Fig. 3.a.s.

3.18 WATER/WATER heat pumps with reversal on the refrigerant circuit, two circuits, 1 evaporator

graph TD
    A["Sonda condensatore 1\nCondenser 1 probe\nB3"] --> B["Condensatore 1\nCondenser 1"]
    B --> C["Resistenza antigelo 1\nAntifreeze heater 1"]
    C --> D["Valvola inversione 1\nReversing valve 1"]
    D --> E["Compressor 1_Circ.1"]
    E --> F["Alta pressione 1\nHigh pressure 1"]
    E --> G["Bassa pressione 1\nLow pressure 1"]
    E --> H["Termico comp.1\nComp. 1 overload"]
    H --> I["Compressor 2_Circ.1"]
    I --> J["Pompa dell'acqua\nWater pump"]
    K["Sonda uscita evaporatore 1\nOutlet evaporator probe 1"] --> L["Flussostato\nFlow switch"]
    L --> M["Condensatore 2\nCondenser 2"]
    M --> N["Resistenza antigelo 2\nAntifreeze heater 2"]
    N --> O["Valvola inversione 2\nReversing valve 2"]
    O --> P["Compressor 1_Circ.2"]
    P --> Q["Bassa pressione 2\nLow pressure 2"]
    P --> R["Alta pressione 2\nHigh pressure 2"]
    P --> S["Termico comp. 2\nComp. 2 overload"]
    S --> T["Compressor 2_Circ.2\nCompressor 2^-"]

Fig. 3.a.t.

3.19 WATER/WATER heat pumps with reversal on the water circuit, single circuit

graph TD
    A["Esterno External"] --> B["Condenser"]
    B --> C["Compressor 1 - Circ.1"]
    C --> D["Valvola inversione Reversing valve"]
    D --> E["Valvola inversione Reversing valve"]
    E --> F["Valvola / External"]
    G["Condenser probe B3"] --> H["Compressor 1 - Circ.1"]
    H --> I["Alta pressione High pressure"]
    I --> J["Bassa pres. Low pressure"]
    J --> K["Termico comp. Comp. overload"]
    K --> L["Compressor 2 - Circ.1"]
    L --> M["Pompa dell'acqua Water pump"]
    N["Flussostato Flow switch"] --> O["Sonda uscita evaporatore Outlet evaporator probe B2"]
    O --> P["Resistenza antigelo Antifreeze heater"]
    Q["Sonda condensazione Condenser"] --> R["Condensatore Condenser"]
    S["Sonda ingresso evaporatore Inlet evaporator probe B1"] --> T["Resistenza antigelo Antifreeze heater"]
    U["Valvola inverseine Reversing valve"] --> V["Valvola inversione Reversing valve"]
    W["Interno (estate) Internal (cooling)"] --> X["Valvola inversione Reversing valve"]

Fig. 3.a.u.

3.20 WATER/WATER heat pumps with reversal on the water circuit, two circuits, H02=1 and H21=4

graph TD
    A["Condensatore 1"] --> B["Condenser 1"]
    B --> C["Compressor 1 - Circ.1"]
    C --> D["Alta pressione1 High pressure1 Termico comp. 1 Comp. 1 overload"]
    D --> E["Compressor 2 Compressor 2 _Circ.1"]
    F["Condensatore 2"] --> G["Condenser 2"]
    G --> H["Compressor 1 - Circ.2"]
    H --> I["Bassa pres. 2 Low pressure 2 Termico comp. 2 Comp. 2 overload"]
    I --> J["Pompa dell'acqua Water pump"]
    J --> K["Valvola inversionione 1 e 2 Reversing valve 1 and 2"]
    K --> L["Externo / External"]
    M["Sonda condensatore 1"] --> N["Condenser 1 probe B3"]
    O["Sonda uscita evaporatore 1"] --> P["Outlet evaporator probe 1"]
    Q["Sonda condensatore 2"] --> R["Condenser 2 probe B4"]
    S["Sonda condensatore 1"] --> T["Condenser 1 probe B2"]
    U["Sonda condensatore 2"] --> V["Condenser 2 probe B6"]
    W["Bassas pres. 1 Low pressure 1"] --> X["Sonda cond. Condenser probe"]
    Y["Bassas pres. 2 Low pressure 2"] --> Z["Sonda ingresso evaporatore Inlet evaporator probe B5"]
    AA["Bassas pres. 2 Low pressure 2"] --> AB["Bassa pres. 2 Low pressure 2"]
    AC["Bassas pres. 2 Low pressure 2"] --> AD["Alta pressione 2 High pressure 2"]
    AE["Bassas pres. 2 Low pressure 2"] --> AF["Alta pressione 2 High pressure 2"]

Fig. 3.a.v.

3.21 WATER/WATER heat pumps with reversal on the water circuit, two circuits, 1 evaporator H02=1 and H21=4

graph TD
    A["Condensatore 1"] --> B["Resistenza antigelo 1"]
    B --> C["Condenser 1"]
    C --> D["Evaporatore / Evaporator"]
    D --> E["Compressor 1"]
    E --> F["Alta pressione 1"]
    F --> G["High pressure 1"]
    G --> H["Termico comp. 1"]
    H --> I["Comp. 1 overload"]
    I --> J["Compressor 2"]
    J --> K["Valvola invers. 1 e 2"]
    K --> L["Revers. valve 1 and 2"]
    L --> M["Compressor 2"]
    M --> N["Externo / External"]
    N --> O["Condensatore 2"]
    O --> P["Condenser 2"]
    P --> Q["Flussostato Flow switch"]
    Q --> R["Uscita evaporatore 1"]
    R --> S["Output evaporator 1"]
    S --> T["B6"]
    T --> U["Sonda condensatore 2"]
    U --> V["Condenser 2 probe"]
    V --> W["B4"]
    W --> X["Sonda condensatore 2 Condenser 1 probe"]
    X --> Y["B3"]
    Y --> Z["Sonda condensatore 1 Condenser 1 probe"]
    Z --> AA["Condensatore 1"]
    AA --> AB["Resistenza antigelo 1 Antifreeze heater 1"]
    AB --> AC["Compressor 1"]
    AC --> AD["Alta pressione 1"]
    AD --> AE["Bassa pres. 1 Low pressure 1"]
    AE --> AF["Termico comp. 1"]
    AF --> AG["Comp. 1 overload"]
    AG --> AH["B1 Sonda cond. Condenser probe"]
    AH --> AI["Pompa dell'acqua Water pump"]
    AI --> AJ["Valvola invers. 1 e 2 Revers. valve 1 and 2"]
    AJ --> AK["Compressor 2"]
    AK --> AL["Externo / External"]
    AL --> AM["Condensatore 2 Condenser 2"]
    AM --> AN["Sonda condensatore 2 Condenser 2 probe"]
    AN --> AO["Sonda condensatore 1 Condenser 1 probe"]
    AO --> AP["B5"]
    AP --> AQ["Sonda ingresso evaporatore Inlet evaporator probe"]
    AQ --> AR["Bassa pres. 2 Low pressure 2"]
    AR --> AS["Alta pressione 2 High pressure 2"]
    AS --> AT["Termico comp. 2 Comp. 2 overload"]

Fig. 3.a.z.

3.22 Air-cooled condensing unit without reverse cycle, single circuit

graph TD
    A["Termico ventilatore condensatore / Condenser fan overload"] --> B["Ventilatore / Fan"]
    B --> C["Sonda condensatore Condenser probe"]
    C --> D["B3/4"]
    D --> E["Compressor 1_Circ.1 Compressor 1"]
    E --> F["Alta pressione High pressure"]
    E --> G["Bassa pressione Low pressure"]
    E --> H["Termico compressore / Compressor overload"]
    H --> I["Compressor 2_Circ.1 Compressor 2"]

Fig. 3.b.a.

3.23 Air-cooled condensing unit without reverse cycle, two circuits

graph TD
    A["Termico ventilatore condensatore / Condenser fan overload"] --> B["Sonda condensatore"]
    B --> C["Condenser probe"]
    C --> D["B3/4"]
    D --> E["Compressor 1_Circ.1"]
    E --> F["Alta pressione 1"]
    E --> G["Bassa pressione 1"]
    E --> H["Low pressure 1"]
    E --> I["Termico compressore 1 / Compressor 1 overload"]
    I --> J["Compressor 2_Circ.1"]
    J --> K["Compressor 2"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#cff,stroke:#333
    style F fill:#ffc,stroke:#333
    style G fill:#ffc,stroke:#333
    style H fill:#ffc,stroke:#333
    style I fill:#ffc,stroke:#333
    style J fill:#cfc,stroke:#333
    style K fill:#cfc,stroke:#333

graph TD
    A["Termico ventilatore condensatore / Condenser fan overload"] --> B["Sonda condensatore"]
    B --> C["Condenser probe"]
    C --> D["B7/B"]
    D --> E["Compressor 1 - Circ.2 Compressor 1"]
    E --> F["Alta pressione 2 - High pressure 2"]
    E --> G["Bassa pressione 2 - Low pressure 2"]
    E --> H["Termico compressore 2 / Compressor 2 overload"]
    H --> I["Compressor 2 - Circ.2 Compressor 2"]

Fig. 3.b.b.

3.24 Reverse-cycle air-cooled condensing unit, single circuit

graph TD
    A["Termico ventilatore condensatore / Condenser fan overload"] --> B["Sonda condensatore / Condenser probe"]
    B --> C["Valvola inversione Reversing valve"]
    C --> D["Compressor 1 Compressor 1 Circ.1"]
    D --> E["Alta pressione High pressure"]
    D --> F["Bassa pressione Low pressure"]
    D --> G["Termico comp. Comp. overload"]
    G --> H["Compressor 2 Compressor 2 Circ.1"]
    H --> I["Bassar component"]
    J["Ventilatore / Fan"] --> B

Fig. 3.b.c.

3.25 Reverse-cycle air-cooled condensing unit, two circuits with condenser fan circuit

graph TD
    A["Sonda condensatore Condenser probe"] --> B["B3/4"]
    B --> C["Valvola inversione Reversing valve"]
    C --> D["Compressor 1_Circ.1"]
    D --> E["Alta pressione 1 High pressure 1"]
    D --> F["Bassa pressione 1 Low pressure 1"]
    D --> G["Termico comp.1 Comp. 1 overload"]
    G --> H["Compressor 2_Circ.1"]
    H --> I["Valvola inversione Reversing valve"]
    I --> J["Compressor 1_Circ.2"]
    J --> K["Alta pressione 2 High pressure 2"]
    J --> L["Bassa pressione 2 Low pressure 2"]
    J --> M["Termico comp. 2 Comp. 2 overload"]
    M --> N["Compressor 2_Circ.2"]
    N --> O["Valvola inversione Reversing valve"]
    O --> P["Valvolatore / Fan"]
    P --> Q["Ventilatore / Fan Condenser fan overload"]

Fig. 3.b.d.

3.26 Water-cooled condensing unit without reverse cycle, single circuit

graph TD
    A["Condensatore Condenser"] --> B["Compressor 1_Circ.1"]
    A --> C["Compressor 2_Circ.1"]
    B --> D["Bassa pressione Low pressure"]
    C --> E["Compressor 2_Circ.1"]
    F["Sonda temp. acqua cond. Water cond. temp. probe"] --> G["Flussostato Flow switch"]
    H["Alta pressione High pressure"] --> I["Compressor 1"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#cff,stroke:#333
    style F fill:#ffc,stroke:#333
    style G fill:#fcc,stroke:#333
    style H fill:#ffc,stroke:#333

Fig. 3.b.e.

3.27 Water-cooled condensing unit without reverse cycle, two circuits

graph TD
    A["Flussostato Flow switch"] --> B["Condensatore Condenser"]
    B --> C["Compressor 1_Circ.1"]
    B --> D["Compressor 2_Circ.1"]
    B --> E["Pompa dell'acqua Water pump"]
    F["Sonda temp. acqua cond. Water cond. temp. probe"] --> B
    G["Sonda temp. acqua cond. Water cond. temp. probe"] --> B
    H["B3"] --> B
    I["B7"] --> B
    J["Alta pressione High pressure Termico comp./Comp.overload"] --> B
    K["Bassa pressione Low pressure"] --> B
    L["Compressor 1_Circ.2"] --> M["Compressor 1"]
    N["Compressor 2_Circ.2"] --> O["Compressor 1"]
    P["Alta pressione 2 High pressure Termico comp./Comp.overload"] --> M
    Q["Bassa pressione 2 Low pressure"] --> M

Fig. 3.b.f.

3.28 Reverse-cycle water-cooled condensing unit, single circuit

graph TD
    A["Sonda condensatore Condenser probe"] --> B["Condensatore Condenser"]
    B --> C["Resistenza antigelo Antifreeze heater"]
    C --> D["Valvola inversione Reversing valve"]
    D --> E["Compressor 1_Circ.1"]
    E --> F["Alta pressione High pressure"]
    E --> G["Bassa pressione Low pressure"]
    E --> H["Termico comp. Comp. overload"]
    H --> I["Compressor 2_Circ.1"]
    I --> J["Pompa dell'acqua Water pump"]
    J --> K["Bassera flow path"]

Fig. 3.b.g.

3.29 Reverse-cycle water-cooled condensing unit, two circuits

graph TD
    A["Sonda condensatore Condenser probe"] --> B["Condensatore 1 Condenser 1"]
    B --> C["Resistenza antigelo 1 Antifreeze heater 1"]
    C --> D["Valvola inversione Reversing valve"]
    D --> E["Compressor 1 Circ.1 Compressor 1"]
    E --> F["Alta pressione 1 High pressure1"]
    E --> G["Bassa pressione1 Low pressure1"]
    E --> H["Termico comp.1 Comp. overload 1"]
    H --> I["Compressor 2 Circ.1 Compressor 2"]
    I --> J["Flussostatb Fluxswitch"]
    J --> K["Pompa dell'acqua Water pump"]
    L["Sonda condensatore Condenser probe"] --> M["Condensatore 2 Condenser 2"]
    M --> N["Resistenza antigelo 2 Antifreeze heater 2"]
    N --> O["Valvola inversione Reversing valve"]
    O --> P["Compressor 1 Circ.2 Compressor 1"]
    P --> Q["Alta pressione 2 High pressure 2"]
    P --> R["Bassa pressione 2 Low pressure 2"]
    P --> S["Termico comp. 2 Comp. 2 overload"]
    S --> T["Compressor 2 Circ.2 Compressor 2"]

Fig. 3.b.h.

4. Parameters

4.1 Menu layout

graph TD
    A["Menù principale Main Menù"] --> B["Inserimento Password Setting Password"]
    B --> C["Parametri F-r* Parameters F-r* Software"]
    C --> D["Regolazione Regulation"]
    D --> E["Parametri P* Parameters P* Allarmi Alarm"]
    E --> F["Impostazione unità Unit setting"]
    F --> G["Ventilatori Fan"]
    G --> H["Valore parametri F1 Parameter Values F1"]
    H --> I["Per modificare to modify"]
    I --> J["Sel per selezionare to select"]
    J --> K["Per salvare la modifica to save the modification"]
    K --> L["Valore parametri F1 Parameters F1"]
    L --> M["Sel or Or"]
    M --> N["Parametri Fn Parameters Fn"]
    N --> O["Defrost"]
    O --> P["Compressor Compressor"]
    P --> Q["Sensori Probes"]
    Q --> R["Parameters b* Parameters b* Sensori"]
    R --> S["Antighiaccio Antifreeze"]
    S --> T["Parameters A* Parameters A* Software"]
    T --> U["Impostazione sonde Probe settings"]
    U --> V["Impostazione orologio Time settings"]
    V --> W["Parameters t* Parameters t* Regolazione Regulation"]
    W --> X["Parametri r* Parameters r* Software"]
    X --> Y["Inserimento Password Setting Password"]
    Y --> Z["Sel or Or"]

Fig. 4.a

- / - Probe configuration

- A - Antifreeze

- B - Input - Output

- C - Compressors

-d-Defrost

-F-Condenser

- H - Unit configuration

- P - Alarm configuration

- r - Control parameters

F-r Software version

- t - Clock

EVD Electronic valve driver

The various functions of the units are described below, with specific references to the parameters in the table according to the program menu codes.

4.2 List of parameters with the pLD user interface

pLD Extended description Min/max limits Unit of measure Default Access
/* parameters: probe settings
/1 Calibration offset for analogue input B1 -9.9 to 9.9 °C/bar 0		user
/2 Calibration offset for analogue input B2 -9.9 to 9.9 °C/bar 0		user
/3	Calibration offset for analogue input B3	-9.9 to 9.9	bar	0	user
/4	Calibration offset for analogue input B4	-9.9 to 9.9	bar	0	user
/5	Calibration offset for analogue input B5	-9.9 to 9.9	°C	0	user
/6	Calibration offset for analogue input B6	-9.9 to 9.9	°C	0	user
/7	Calibration offset for analogue input B7	-9.9 to 9.9	°C	0	user
/8	Calibration offset for analogue input B8	-9.9 to 9.9	%/°C	0	user
/9	Calibration offset for analogue input B9	-9.9 to 9.9	°C	0	user
/10	Calibration offset for analogue input B10	-9.9 to 9.9	°C	0	user
A* parameters: antifreeze
A1	Antifreeze alarm set point (chiller units)low room temperature (air/air units)	-99.9 to 99.9	°C	3.0	user
A2	Antifreeze alarm differential (chiller units)Low room temperature (air/air units)	-99.9 to 99.9	°C	1.0	user
A3	Antifreeze heater set point	-99.9 to 99.9	°C	5.0	user
A4	Antifreeze heater differential	-99.9 to 99.9	°C	1.0	user
A5	Support heater set point in cooling mode	-99.9 to 99.9	°C	30.0	user
A6	Heater differential support in cooling mode	-99.9 to 99.9	°C	1.0	user
A7	Support heater 1 set point in heating mode	15.0 to 50.0	°C	25.0	user
A8	Support heater 1 differential in heating mode	0.0 to 10.0	°C	5.0	user
A9	Support heater 2 set point in heating mode	15.0 to 50.0	°C	24.0	user
A10	Support heater 2 differential in heating mode	0.0 to 10.0	°C	5.0	user
A11	Support heater activation delay in heating	0 to 60	min	15	user
A12	Device start-up mode in antifreeze with unit off	DISABLEDHEAT & PUMP ONHEAT & UNIT ONHEATER ONLY ON		DISABLED	user
b* parameters: sensors
B1	Value of analogue input B1	-99.9 to 99.9	°C/bar
B2	Value of analogue input B2	-99.9 to 99.9	°C/bar
B3	Value of analogue input B3	-99.9 to 99.9	bar
B4	Value of analogue input B4	-99.9 to 99.9	bar
B5	Value of analogue input B5	-99.9 to 99.9	°C
B6	Value of analogue input B6	-99.9 to 99.9	°C
B7	Value of analogue input B7	-99.9 to 99.9	°C
B8	Value of analogue input B8	-99.9 to 99.9	%/°C
B9	Value of analogue input B9	-99.9 to 99.9	°C
B10	Value of analogue input B10	-99.9 to 99.9	°C
B11	Status of digital input 1
B12	Status of digital input 2
B14	Status of digital input 4
B15	Status of digital input 5
B16	Status of digital input 6
B17	Status of digital input 7
B18	Status of digital input 8
B19	Status of digital input 9
B20	Status of digital input 10
B21	Status of digital input 11
B22	Status of digital input 12
B23	Status of digital input 13
B24	Status of digital input 14
B25	Status of digital input 15
B26	Status of digital input 16
B27	Status of digital input 17
B28	Status of digital input 18
B29	Status of digital output 1
B30	Status of digital output 2
B31	Status of digital output 3
B32	Status of digital output 4
B33	Status of digital output 5
B34	Status of digital output 6
B35	Status of digital output 7
B36	Status of digital output 8
B37	Status of digital output 9
B38	Status of digital output 10
B39	Status of digital output 11
B40	Status of digital output 12
B41	Status of digital output 13				direct
B42	Status of digital output 14
B43	Status of analogue output 1	0.0	V
B44	Status of analogue output 2	0.0	V
B45	Status of analogue output 5	0.0	V
c* parameters: compressors
c1	Condenser pump operating hours x 1000	0 to 999	h
c2	Condenser pump operating hours	0 to 999	h
c3	Evaporator pump / main fan operating hours x 1000	0 to 999	h
c4	Evaporator pump / main fan operating hours	0 to 999	h
c5	Evaporator pump 2 operating hours x 1000	0 to 999	h
c6	Evaporator pump 2 operating hours	0 to 999	h
c7	Compressor 1 operating hours circuit 1 x 1000	0 to 999	h
c8	Compressor 1 operating hours circuit 1	0 to 999	h
c9	Compressor 2 operating hours circuit 1 x 1000	0 to 999	h
c10	Compressor 2 operating hours circuit 1	0 to 999	h

μC3

pLD Extended description Min/max limits Unit of measure Default Access
c11 Compressor 3 operating hours circuit 1 x 1000 0 to 999 h
c12 Compressor 3 operating hours circuit 1 0 to 999 h
c13 Compressor 1 operating hours circuit 2 x 1000 0 to 999 h
c14 Compressor 1 operating hours circuit 2 0 to 999 h
c15 Compressor 2 operating hours circuit 2 x 1000 0 to 999 h
c16 Compressor 2 operating hours circuit 2 0 to 999 h
c17 Compressor 3 operating hours circuit 2 x 1000 0 to 999 h
c18 Compressor 3 operating hours circuit 2 0 to 999 h
c19 Manually force compressor 1 circuit 1 N/Y N user
c20 Manually force compressor 2 circuit 1 N/Y N user
c21 Manually force compressor 3 circuit 1 N/Y N user
c22 Manually force compressor 1 circuit 2 N/Y N user
c23 Manually force compressor 2 circuit 2 N/Y N user
c24 Manually force compressor 3 circuit 2 N/Y N user

d* parameters: defrost

d1	Start defrost threshold	-99.9 to 99.9	°C/bar	2.0	user
d2	End defrost threshold	-99.9 to 99.9	°C/bar	12.0	user
d3	Enable sliding defrost function	N / Y N user
d4	Minim. set point to start defrost accessible with sliding defrost function	0.0 to 99.9	°C/bar	0.5	user
d5	Outside temperature threshold to start sliding defrost action	-99.9 to 99.9	°C	0.0	user
d6	Outside temperature threshold for maximum sliding defrost action	-99.9 to 99.9	°C	0.0	user

F* parameters: fans

F1	Start hour for low-noise operation	0 to 23	h	0	user
F2	Start minutes for low-noise operation	0 to 59	min	0	user
F3	End hour for low-noise operation	0 to 23	h	0	user
F4	End minutes for low-noise operation	0 to 59	min	0	user
F5	Low-noise set point in cooling	0.0 to 99.9	°C/bar	0.0	user
F6	Low-noise set point in heating	0.0 to 99.9	°C/bar	0.0	user

H* parameters: unit configuration

H1	Enable unit ON/OFF from digital input	N/Y N user
H2	Enable cooling/heating selection from digital input	N/Y		N	user
H3	Enable unit ON/OFF from supervisor	N/Y N user
H4	Enable cooling/heating selection from supervisor	N/Y		N	user
H5	Select type of serial protocol for supervisory network	CARELMODBUSLONWORKSRs232MODEM ANALOGUE.GSM MODEM		CAREL	user
H6	Serial port communication speed for supervisory network 1200 (RS485/RS422)	2400 (RS485/RS422)4800 (RS485/RS422)9600 (RS485/RS422)19200 (ONLY RS485)	19200 (ONLY RS485)	user
H7	Serial identification number for supervisory network	0 to 200		1	user

P* parameters: alarms

P1	Evaporator flow switch alarm delay at start-up	0 to 999	s	15	user
P2	Evaporator flow switch alarm delay in steady operation	0 to 999	s	3	user
P3	Condenser flow switch alarm delay at start-up	0 to 999	s	15	user
P4	Condenser flow switch alarm delay in steady operation	0 to 999	s	3	user

r* parameters: control

r1	Active set point		°C		direct
r2	Current outside temperature compensation value (B7)		°C		direct
r3	Current set point from analogue input B8		°C
r4	Cooling set point	-99.9 to 99.9	°C	12.0	direct
r5	Heating set point	-99.9 to 99.9	°C	45.0	direct
r6	Minimum set point value from probe B8 (cooling)	-99.9 to 99.9	°C	7.0	direct
r7	Maximum set point value from probe B8 (cooling)	-99.9 to 99.9	°C	17.0	direct
r8	Minimum set point value from probe B8 (heating)	-99.9 to 99.9	°C	40.0	direct
r9	Maximum set point value from probe B8 (heating)	-99.9 to 99.9	°C	50.0
r10	Temperature control band	0 to 99.9	°C	3.0	user
r11	Enable set point compensation	N/Y N user
r12	Maximum compensation value	-99.9 to 99.9	°C	5.0	user
r13	Minimum outside temperature for compensation in cooling	-99.9 to 99.9	°C	25.0	user
r14	Maximum outside temperature for compensation in cooling	-99.9 to 99.9	°C	35.0	user
r15	Minimum outside temperature for compensation in heating	-99.9 to 99.9	°C	10.0	user
r16	Maximum outside temperature for compensation in heating	-99.9 to 99.9	°C	0.0	user
r17	Outside temperature set point limit	-99.9 to 99.9	°C	-10.0	user
r18	Outside temperature differential limit	-9.9 to 9.9	°C	2.0	user

F-r* parameters: software

F1	Software version, first digit				direct
F1	Software version, second digit
F3	Software version day
F4	Software version month
F5	Software version year

t* parameters: clock setting

t1	Hour setting	0 to 23	h
t2	Minutes setting	0 to 59	min
t3	Day setting	1 to 31	day
t4	Month setting	1 to 12	month
t5	Year setting	0 to 99	year

4.3 List of parameters with the pGD user interface

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/Int/Dig	Supervisor address	R/R-W
Hour	System hours	h			I		N
Minutes	System minutes	m		INT		76	R
Day	System day
Month	System month
Year	System year
In. air.t.In. evap.t.In. cond.t.In. diff.t.	Ambient air temperature (air/air units)Evaporator water inlet temperatureCondenser water inlet temperature (water/water units)Differential between evaporator inlet temperature and outside temperature		°C
	Air outlet temperature (air/air units)Evaporator water outlet temperatureCondenser water outlet temperature (water/water units)Differential between evaporator outlet temperature and outside temperature		°C
Ext.control	External temp. control request percentage (condensing units)		%			INT	51	R
	Unit status	UNIT ONOFF FROM ALARMOFF FROM SUPERV.OFF FROM BANDSOFF FROM DIG.IN.OFF FROM BUTTONANTIFREEZE PROBEP/LOAD PREVENT HPDEFROST CIRC.1DEFROST CIRC.2				INT	50	R
CHHP	Active operating mode (chiller/heat pump)					DIG	46	R
On/Off unit	Unit ON/OFF from panel	UNIT OFFUNIT ON
Running mode	Cooling/Heating from panel	COOLINGHEATING
Insert password	User / Manufacturer access password	0 to 9999
Current language:ENGLISHpress [→]for change	Select pGD user interface language	ITALIANOENGLISHESPAÑOL		ENGLISH
Probe offset B1:	Calibration offset for analogue input B1	-9.9 to 9.9	°C/bar	0	user
Probe offset B2:	Calibration offset for analogue input B2	-9.9 to 9.9	°C/bar	0	user
Probe offset B3:	Calibration offset for analogue input B3	-9.9 to 9.9	bar	0	user
Probe offset B4:	Calibration offset for analogue input B4	-9.9 to 9.9	bar	0	user
Probe offset B5:	Calibration offset for analogue input B5	-9.9 to 9.9	°C	0	user
Probe offset B6:	Calibration offset for analogue input B6	-9.9 to 9.9	°C	0	user
Probe offset B7:	Calibration offset for analogue input B7	-9.9 to 9.9	°C	0	user
Probe offset B8:	Calibration offset for analogue input B8	-9.9 to 9.9	%/°C	0	user
Probe offset B9:	Calibration offset for analogue input B9	-9.9 to 9.9	°C	0	user
Probe offset B10:	Calibration offset for analogue input B10	-9.9 to 9.9	°C	0	user
Enable probeB1: Tank temp.B1: T.condens.1B1: P.evapor.1B1: T.in.cond	Enable analogue input B1Boiler temperatureCondensing temperature 1Evaporation pressure 1Condenser inlet temperature (water/water units)	N/Y		N	manufacturer	DIG	11	RW
Enable probeB2: Not usedB2: T.condens.2B2: P.evapor.2B2: T.out.cond	Enable analogue input B2Condensing temperature 2Evaporation pressure 2Condenser outlet temperature (water/water units)	N/Y		N	manufacturer	DIG	12	RW
Enable probeB3: P.condens.1	Enable analogue input B3Condensing pressure 1	N/Y		N	manufacturer	DIG	13	RW
Enable probeB4: P.condens.2	Enable analogue input B4Condensing pressure 2	N/Y		N	manufacturer	DIG	14	RW
Enable probeB5: Room temp.B5: T.in.evapB5: Not used	Enable analogue input B5Room temperature (air/air units)Evaporator water inlet temperature (chiller units)	N/Y		Y	manufacturer	DIG	15	RW
Enable probeB6: T.out.airB6: T.out.waterB6: Not used	Enable analogue input B6Evaporator air outlet temperatureEvaporator water outlet temperature	N/Y		Y	manufacturer	DIG	16	RW
Enable probeB7: External temp.	Enable analogue input B7Outside air temperature	N/Y		N	manufacturer	DIG	17	RW
Enable probeB8: External setB8: Ext.contr.	Enable analogue input B8External set pointExternal control unit (condensing units)	N/Y		N	manufacturer	DIG	18	RW
Enable probeB9: T.out.ev.1B9: Not used	Enable analogue input B9Evaporator 1 outlet temperature	N/Y		N	manufacturer	DIG	19	RW
Enable probeB10: T.out.ev.2B10: Not used	Enable analogue input B10Evaporator 2 outlet temperature	N/Y		N	manufacturer	DIG	20	RW

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
B1 probe config. Min.value	Minimum end scale configuration for analogue input B1	-30.0 to 150.0	bar	-0.5	manufacturer
B1 probe config. Max value	Maximum end scale configuration for analogue input B1 0.0 to 150.0 bar	7.0 manufacturer
B2 probe config. Min.value	Minimum end scale configuration for analogue input B2	-30.0 to 150.0	bar	-0.5	manufacturer
B2 probe config. Max value	Maximum end scale configuration for analogue input B2 0.0 to 150.0 bar	7.0 manufacturer
B3 probe config. Min.value	Minimum end scale configuration for analogue input B3	-30.0 to 150.0	bar	0.0	manufacturer
B3 probe config. Max value	Maximum end scale configuration for analogue input B3 0.0 to 150.0 bar	30.0 manufacturer
B4 probe config. Min.value	Minimum end scale configuration for analogue input B4	-30.0 to 150.0	bar	0.0	manufacturer
B4 probe config. Max value	Maximum end scale configuration for analogue input B4 0.0 to 150.0 bar	30.0 manufacturer
B8 probe config. Min.value	Minimum end scale configuration for analogue input B8	-30.0 to 150.0	%/°C	0.0	manufacturer
B8 probe config. Max value	Maximum end scale configuration for analogue input B8	0.0 to 150.0	%/°C	100.0	manufacturer
Analog inputs 1 & 2 configuration	Configuration of analogue inputs B1 and B2	BOILER TEMP. CONDENSE TEMP. EVAP, PRESS.		BOILER TEMPERAT URE	manufacturer	INT	1	RW
Reciprocating comp.	Type of semi-hermetic compressors controlled	PART LOAD ONLY WITH PUMP DOWN WITH PARTWINDING		PART LOAD ONLY.	manufacturer
Maximum time	Maximum pumpdown duration	1 to 999	s	60	manufacturer	INT	2	RW
PW time	Part-winding time	1 to 999	ms	1	manufacturer	INT	3	RW
Pump down config. End from:	Select end pumpdown mode	PRESS. SWITCH PRESSURE PROBE		PRESS. SWITCH	user
End set:	End pumpdown pressure (from low pressure transducer)	-99.9 to 99.9	bar	0.0	user	ANA	3	RW
Unload enabled	Enable compressor capacity control	N/Y		N	manufacturer
Type:	Configure compressor capacity-control relay operating logic	N.C. N.O.		N.C.	manufacturer
Unload time	Compressor capacity control deactivation delay	1 to 999	s	5	manufacturer	INT	4	RW
Compressors min. time ON	Minimum compressor on time	0 to 9999	s	60	manufacturer	INT	5	RW
Compressors min. time OFF	Minimum compressor off time	0 to 9999	s	360	manufacturer	INT	6	RW
Time between diff. comp.starts	Minimum time between starts of different compressors	0 to 9999	s	10	manufacturer	INT	7	RW
Time between same comp.starts	Minimum time between starts of the same compressor	0 to 9999	s	450	manufacturer	INT	8	RW
Min.time between pump/fan and compressors starting	Delay between start of pump/main fan and compressors	0 to 999	s	5	manufacturer	INT	107
Delay OFF main pump/fan	Delay for stopping the pump/main fan	0 to 999	s	5	manufacturer	INT	108
Hour meter Cond.pump	Condenser pump operating hours x 1000	0 to 999	h			INT	62	R
Hour meter Cond.pump	Condenser pump operating hours	0 to 999	h			INT	63	R
Hour meter Main pump Main fan	Evaporator pump / main fan operating hours x 1000	0 to 999	h			INT	58
Hour meter Main pump Main fan	Evaporator pump / main fan operating hours	0 to 999	h			INT	59
Hour meter Main pump 2	Evaporator pump 2 operating hours x 1000	0 to 999	h			INT	60
Hour meter Main pump 2	Evaporator pump 2 operating hours	0 to 999	h			INT	61
Hour meter Comp.1 circ.1	Compressor 1 operating hours circuit 1 x 1000	0 to 999	h			INT	64
Hour meter Comp.1 circ.1	Compressor 1 operating hours circuit 1	0 to 999	h			INT	65
Hour meter Comp.2 circ.1	Compressor 2 operating hours circuit 1 x 1000	0 to 999	h			INT	66
Hour meter Comp.2 circ.1	Compressor 2 operating hours circuit 1	0 to 999	h			INT	67
Hour meter Comp.3 circ.1	Compressor 3 operating hours circuit 1 x 1000	0 to 999	h			INT	68
Hour meter Comp.3 circ.1	Compressor 3 operating hours circuit 1	0 to 999	h			INT	69
Hour meter Comp.1 circ.2	Compressor 1 operating hours circuit 2 x 1000	0 to 999	h			INT	70
Hour meter Comp.1 circ.2	Compressor 1 operating hours circuit 2	0 to 999	h			INT	71
Hour meter Comp.2 circ.2	Compressor 2 operating hours circuit 2 x 1000	0 to 999	h			INT	72

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
Hour meter Comp.2 circ.2	Compressor 2 operating hours circuit 2 0 to 999 h INT 73
Hour meter Comp.3 circ.2	Compressor 3 operating hours circuit 2 x 1000 0 to 999 h INT 74
Hour meter Comp.3 circ.2	Compressor 3 operating hours circuit 2 0 to 999 h INT 75
Pump/Fan hour meter Threshold	Pump/main fan operating hour threshold alarm x 1000	0 to 999	h	10	user
Reset	Reset pump/main fan operating hours	0 to 1			user
	Evaporator pump / main fan operating hours x 1000	0 to 999	h		user	INT	58	R
	Evaporator main pump fan operating hours	0 to 999	h		user	INT	59	R
Pump 2 hour meter Threshold	Pump 2 operating hour threshold alarm x 1000	0 to 999	h	10	user
Reset	Reset pump 2 operating hours	0 to 1			user
	Evaporator pump 2 operating hours x 1000	0 to 999	h		user	INT	60	R
	Evaporator pump 2 operating hours	0 to 999	h		user	INT	61	R
Condenser pump hour meter Threshold	Condenser pump operating hour threshold alarm x 1000	0 to 999	h	10	user
Reset	Reset condenser pump operating hours	0 to 1			user
	Condenser pump operating hours x 1000	0 to 999	h		user	INT	62	R
	Condenser pump operating hours	0 to 999	h		user	INT	63	R
Comp.1 circ.1 hour meter Threshold	Operating hour threshold alarm, compressor 1 circuit 1 x 1000	0 to 999	h	10	user
Reset	Reset compressor 1 operating hours circuit 1	0 to 1			user
	Compressor 1 operating hours circuit 1 x 1000	0 to 999	h		user	INT	64	R
	Compressor 1 operating hours circuit 1	0 to 999	h		user	INT	65	R
Comp.2 circ.1 hour meter Threshold	Operating hour threshold alarm, compressor 2 circuit 1 x 1000	0 to 999	h	10	user
Reset	Reset compressor 2 operating hours circuit 1	0 to 1			user
	Compressor 2 operating hours circuit 1 x 1000	0 to 999	h		user	INT	66	R
	Compressor 2 operating hours circuit 1	0 to 999	h		user	INT	67	R
Comp.3 circ.1 hour meter Threshold	Operating hour threshold alarm, compressor 3 circuit 1 x 1000	0 to 999	h	10	user
Reset	Reset compressor 3 operating hours circuit 1	0 to 1			user
	Compressor 3 operating hours circuit 1 x 1000 0 to 999 h user INT 68 R
	Compressor 3 operating hours circuit 1	0 to 999	h		user	INT	69	R
Comp.1 circ.2 hour meter Threshold	Operating hour threshold alarm, compressor 1 circuit 2 x 1000	0 to 999	h	10	user
Reset	Reset compressor 1 operating hours circuit 2	0 to 1			user
	Compressor 1 operating hours circuit 2 x 1000	0 to 999	h		user	INT	70	R
	Compressor 1 operating hours circuit 2	0 to 999	h		user	INT	71	R
Comp.2 circ.2 hour meter Threshold	Operating hour threshold alarm, compressor 2 circuit 2 x 1000	0 to 999	h	10	user
Reset	Reset compressor 2 operating hours circuit 2	0 to 1			user
	Compressor 2 operating hours circuit 2 x 1000 0 to 999 h user INT 72 R
	Compressor 2 operating hours circuit 2	0 to 999	h		user	INT	73	R
Comp.3 circ.2 hour meter Threshold	Operating hour threshold alarm, compressor 3 circuit 2 x 1000	0 to 999	h	10	user
Reset	Reset compressor 3 operating hours circuit 2	0 to 1			user
	Compressor 3 operating hours circuit 2 x 1000	0 to 999	h		user	INT	74	R
	Compressor 3 operating hours circuit 2	0 to 999	h		user	INT	75	R
Rotation time with tandem/trio compressors:	Tandem/trio compressor rotation delay in part load operation	1 to 180	min	20	user
Compressors enabled C1/1	Enable operation of compressor 1 circuit 1	N/Y		Y	user	DIG	5	RW
Compressors enabled C2/1	Enable operation of compressor 2 circuit 1	N/Y		Y	user	DIG	6	RW
Compressors enabled C3/1	Enable operation of compressor 3 circuit 1	N/Y		Y	user	DIG	7	RW
Compressors enabled C1/2	Enable operation of compressor 1 circuit 2	N/Y		Y	user	DIG	8	RW
Compressors enabled C2/2	Enable operation of compressor 2 circuit 2	N/Y		Y	user	DIG	9	RW
Compressors enabled C3/2	Enable operation of compressor 3 circuit 2	N/Y		Y	user	DIG	10	RW

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
1-2 analog inputs:Tank temp.T.conders.1P.evapor.1T.in.cond	Value of analogue input B1Boiler temperatureCondensing temperature 1Evaporation pressure 1Condenser inlet temperature (water/water units)	99.9 to 99.9 °C/bar ANA	43 R
1-2 analog inputs:Not usedT.conders.2P.evapor.2T.out.cond	Value of analogue input B2Condensing temperature 2Evaporation pressure 2Condenser outlet temperature (water/water units)	99.9 to 99.9 °C/bar ANA	44 R
3-4 analog inputs:P.conders.1	Value of analogue input B3Condensing pressure 1	-99.9 to 99.9 bar ANA	45 R
3-4 analog inputs:P.conders.2	Value of analogue input B4Condensing pressure 2	-99.9 to 99.9 bar ANA	46 R
5-6 analog inputs:Room temp.T.in.evap.Not used	Value of analogue input B5Room temperature (air/air units)Evaporator water inlet temperature	-99.9 to 99.9 °C ANA	47 R
5-6 analog inputs:T.out airT.out.evap.Not used	Value of analogue input B6Air outlet temperature (air/air units)Evaporator water outlet temperature	-99.9 to 99.9 °C ANA	48 R
7-8 analog inputs:Ext.temp.	Value of analogue input B7Outside air temperature	-99.9 to 99.9 °C ANA	49 R
7-8 analog inputs:External setExt.contr.	Value of analogue input B8External set pointExternal control value (condensing units)	-99.9 to 99.9 %/°C ANA	50 R
9-10 analog inputs:T.out.ev.1Not used	Value of analogue input B9Evaporator 1 water outlet temperature	-99.9 to 99.9 °C ANA	51 R
9-10 analog inputs:T.out.ev.2Not used	Value of analogue input B10Evaporator 2 water outlet temperature	-99.9 to 99.9 °C ANA	52 R
1-3 dig.inputs:Serious alarmRemote On/Off	Status of digital input 1Serious alarm from digital inputON/OFF from digital input (condensing units with control from digital inputs)							DI
1-3 dig.inputs:Air flow stateEvap.flow stateControl step 1Not used	Status of digital input 2Air flow switch (air/air units)Evaporator water flow switchCondensing unit digital control 1							DI
1-3 dig.inputs:Remote On/OffControl step 2	Status of digital input 3Remote On/OffCondensing unit digital control 2							DI
4-6 dig.inputs:Overload main fanOverload ev.pumpNot used	Status of digital input 4Main fan thermal overloadEvaporator pump 1 thermal overloadCondensing unit digital control 3							DI
4-6 dig.inputs:Pressost.L.press.1	Status of digital input 5Low pressure switch circuit 1							DI
4-6 dig.inputs:Pressost.H.press.1	Status of digital input 6High pressure switch circuit 1							DI
7-9 dig.inputs:Over.comp.1 circ.1	Status of digital input 7Compressor 1 thermal overload circuit 1							DI
7-9 dig.inputs:Over.comp.2 circ.1	Status of digital input 8Compressor 2 thermal overload circuit 1							DI
7-9 dig.inputs:Over.fan 1 Circ.1Overload cond.pump	Status of digital input 9Condenser fan 1 thermal overload circuit 1Condenser pump thermal overload							DI
10-12 dig.inputs:Pressost.L.press.2	Status of digital input 10Low pressure switch circuit 2							DI
10-12 dig.inputs:Pressost.H.press.2	Status of digital input 11High pressure switch circuit 2							DI
10-12 dig.inputs:Over.comp.1 circ.2	Status of digital input 12Compressor 1 thermal overload circuit 2							DI
13-15 dig.inputs:Over.comp.2 circ.2	Status of digital input 13Compressor 2 thermal overload circuit 2							DI
13-15 dig.inputs:Over.fan 2 Circ.1Over.fan 1 Circ.2Cond. flow state	Status of digital input 14Condenser fan 2 thermal overload circuit 1 (1 condenser)Condenser fan 1 thermal overload circuit 2 (2 condensers)Condenser water flow switch(water/water units)							DI
13-15 dig.inputs:Not usedSummer/Winter	Status of digital input 15Select cooling/heating from digital input							DI

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/Int/Dig	Supervisor address	R/R-W
16-18 dig.inputs:Not usedOver.fan 2 Circ.1Over.comp.3 circ.1	Status of digital input 16Condenser fan 2 thermal overload circuit 1 (2 condensers, 4 fans)Compressor 3 thermal overload circuit 1 (units with trio compressors)
16-18 dig.inputs:Not usedOver.fan 2 Circ.2Over.comp.3 circ.2	Status of digital input 17Condenser fan 2 thermal overload circuit 2 (2 condensers, 4 fans)Compressor 3 thermal overload circuit 2 (units with trio compressors)
16-18 dig.inputs:Not usedOverload pump 2Control step 4	Status of digital input 18Evaporator pump 2 thermal overloadCondensing unit digital control 4
1-3 dig.outputs:Comp.1 circ.1Winding A comp.1	Status of digital output 1Compressor 1 circuit 1Winding A compressor 1
1-3 dig.outputs:Comp.2 circ.1Unload comp.1Winding B comp.1	Status of digital output 2Compressor 2 circuit 1Compressor 1 capacity controlWinding B compressor 1
1-3 dig.outputs:Not usedCond.fan 2 circ.1Comp.3 circ.1Solenoid circ.1Unload comp.1	Status of digital output 3Fan 2 circuit 1Compressor 3 circuit 1Liquid solenoid circuit 1Compressor 1 capacity control (if Part-Winding enabled)
4-6 dig.outputs:Cond.fan 1 circ.1Not usedDefrost res.circ.1	Status of digital output 4Fan 1 circuit 1Defrost heater circuit 1
4-6 dig.outputs:Main fanEvaporator pumpNot used	Status of digital output 5Main fan (air/air units)Evaporator pump 1
4-6 dig.outputs:Comp.1 circ.2Winding A comp.2	Status of digital output 6Compressor 1 circuit 2Winding A compressor 2
7-9 dig.outputs:Comp.2 circ.2Unload comp.2Winding B comp.2	Status of digital output 7Compressor 2 circuit 2Compressor 2 capacity controlWinding B compressor 2
7-9 dig.outputs:Not usedEvaporator pump 2Cond.fan 2 circ.2Comp.3 circ.2Solenoid circ.2Unload comp.2	Status of digital output 8Evaporator pump 2Fan 2 circuit 2Compressor 3 circuit 2Liquid solenoid circuit 2Compressor 2 capacity control (if Part-Winding enabled)
7-9 dig.outputs:Cond.fan 2 circ.1Cond.fan 1 circ.2Not usedDefrost res.circ.2	Status of digital output 9Fan 2 circuit 1 (single condenser)Fan 1 circuit 2 (2 condensers)Defrost heater circuit 2
10-12 dig.outputs:General alarm	Status of digital output 10Generic alarm
10-12 dig.outputs:Antifreeze heater1Not used	Status of digital output 11Heater 1
10-12 dig.outputs:Antifreeze heater2Not used	Status of digital output 12Heater 2
13-14 dig.outputs:Not usedValve 4way circ.1Water inv.valve	Status of digital output 134-way valve for reversing the refrigerant circuit in circuit 14-way valve for reversing the water circuit (water/water units)
13-14 dig.outputs:Not usedValve 4way circ.2Condenser pump	Status of digital output 144-way valve for reversing the refrigerant circuit in circuit 2Condenser pump (water/water units)
Analog outputs:Fan circuit 1	Status of analogue output 1Condenser fans circuit 1		V
Analog outputs:Fan circuit 2	Status of analogue output 2Condenser fans circuit 2		V
Analog outputs:Evap.pump 2	Status of analogue output 5Evaporator pump 2		V
Driver1 mode: Active operating mode circuit 1		COOLINGHEATINGDEFROST			direct		INT	105
EEV Mode	Activate manual control, driver 1 (reading)	0 to 1				DIG	160	RW
EEV Position	Read position of valve 1	0 to 9999				INT	97	R
Power request	Read capacity request for driver 1	0 to 100	%			INT	101	R

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
Driver2 mode: Active operating mode circuit 1 COOLING		HEATINGDEFROST				INT	105
EEV Mode Activate manual control, driver 2 (reading) 0 to 1 DIG 161 R								W
EEV Position Read position of valve 2 0 to 9999 INT 98 R
Power request	Read capacity request for driver 2	0 to 100	%			INT	102	R
Driver3 mode: Active operating mode circuit 2 COOLING		HEATINGDEFROST				INT	106
EEV Mode Activate manual control, driver 3 (reading) 0 to 1 DIG 162 R								W
EEV Position Read position of valve 3 0 to 9999 INT 99 R
Power request	Read capacity request for driver 3	0 to 100	%			INT	103	R
Driver4 mode: Active operating mode circuit 2 COOLING		HEATINGDEFROST				INT	106
EEV Mode Activate manual control, driver 4 (reading) 0 to 1 DIG 163 R								W
EEV Position Read position of valve 4 0 to 9999 INT 100 R
Power request	Read capacity request for driver 4	0 to 100	%			INT	104	R
Driver 1	Type of gas used	NoneR22R134aR404aR407cR410aR507cR290R600R600aR717R744				INT	81	W
SuperHeat	SuperHeat measured by driver 1	-999.9 to 999.9	°C			ANA	60	R
Saturated Temp.	Saturation temperature measured by driver 1	-999.9 to 999.9	°C			ANA	64	R
Suction Temp.	Suction temperature measured by driver 1	-999.9 to 999.9	°C			ANA	68	R
Driver 2	Display type of gas used in the refrigerant circuit	See Driver 1				INT	81	RW
Superheat	Superheat measured by driver 2	-999.9 to 999.9	°C			ANA	61	R
Saturated Temp.	Saturation temperature measured by driver 2	-999.9 to 999.9	°C			ANA	65	R
Suction Temp.	Suction temperature measured by driver 2	-999.9 to 999.9	°C			ANA	69	R
Driver 3	Display type of gas used in the refrigerant circuit	See Driver 1				INT	81	RW
SuperHeat	SuperHeat measured by driver 3	-999.9 to 999.9	°C			ANA	62	R
Saturated Temp.	Saturation temperature measured by driver 3	-999.9 to 999.9	°C			ANA	66	R
Suction Temp.	Suction temperature measured by driver 3	-999.9 to 999.9	°C			ANA	70	R
Driver 4	Display type of gas used in the refrigerant circuit	See Driver 1				INT	81	RW
SuperHeat	SuperHeat measured by driver 4	-999.9 to 999.9	°C			ANA	63	R
Saturated Temp.	Saturation temperature measured by driver 4	-999.9 to 999.9	°C			ANA	67	R
Suction Temp.	Suction temperature measured by driver 4	-999.9 to 999.9	°C			ANA	71	R
Driver 1	Display type of gas used in the refrigerant circuit	NoneR22R134aR404aR407cR410aR507cR290R600R600aR717R744				INT	81	W
Evap.press.	Evaporation pressure measured by driver 1	-99.9 to 99.9	barg			ANA	64	R
Evap.temp.	Evaporation temperature measured by driver 1	-99.9 to 99.9	°C			ANA	72	R
Cond.temp.	Condensing temperature measured by driver 1	-99.9 to 99.9	°C			ANA	76	R
Driver 2	Display type of gas used in the refrigerant circuit	See Driver 1				INT	81	RW
Evap.press.	Evaporation pressure measured by driver 2	-99.9 to 99.9	barg			ANA	65	R
Evap.temp.	Evaporation temperature measured by driver 2	-99.9 to 99.9	°C			ANA	73	R
Cond.temp.	Condensing temperature measured by driver 2	-99.9 to 99.9	°C			ANA	77	R
Driver 3	Display type of gas used in the refrigerant circuit	See Driver 1				INT	81	RW
Evap.press.	Evaporation pressure measured by driver 3	-99.9 to 99.9	barg			ANA	66	R
Evap.temp.	Evaporation temperature measured by driver 3	-99.9 to 99.9	°C			ANA	74	R
Cond.temp.	Condensing temperature measured by driver 3	-99.9 to 99.9	°C			ANA	78	R
Driver 4	Display type of gas used in the refrigerant circuit	See Driver 1				INT	81	RW
Evap.press.	Evaporation pressure measured by driver 4	-99.9 to 99.9	barg			ANA	67	R
Evap.temp.	Evaporation temperature measured by driver 4	-99.9 to 99.9	°C			ANA	75	R
Cond.temp.	Condensing temperature measured by driver 4	-99.9 to 99.9	°C			ANA	79	R
EVD1 version Firmware version H driver 1	0 to 999
EVD1 version Firmware version L driver 1	0 to 999
EVD2 version Firmware version H driver 2	0 to 999
EVD2 version Firmware version L driver 2	0 to 999
EVD3 version Firmware version H driver 3	0 to 999
EVD3 version Firmware version L driver 3	0 to 999
EVD4 version Firmware version H driver 4	0 to 999
EVD4 version Firmware version L driver 4	0 to 999
AntifreezeLow room temperaturealarm Setpoint	Antifreeze alarm set point (chiller units)low room temperature (air/air units)	-99.9 to 99.9	°C	3.0	user	ANA	13	RW

μC3

Menu description Extended description Min/max limits		Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
AntifreezeLow room temperature alarm Diff.	Antifreeze alarm differential (chiller units)Low room temperature (air/air units)	-99.9 to 99.9 °C 1.0 user ANA 14 R					W
Antifreeze alarmLow room temperature setpoint limitsLow	Minimum set point limit antifreeze/low room temperature -99.9 to 99.9 °C 0.0 manufacture			1		5
Antifreeze alarmLow room temperature setpoint limits High	Maximum set point limit antifreeze/low room temperature -99.9 to 99.9 °C 12.0 manufacture			1
Antifreeze alarmReset	Type of antifreeze alarm reset MANUALAUTOMATIC		MANUAL	user
Antifreeze alarmDelay	Antifreeze alarm delay when starting (manual reset)	0 to 540	min	0	user	INT	9
Antifreezeheaters Setpoint	Antifreeze heater set point	-99.9 to 99.9		5.0 user ANA 15 R
Antifreezeheaters Diff.	Antifreeze heater differential	-99.9 to 99.9		1.0 user ANA 16 R
Auxiliary heater in cooling mode Setpoint	Support heater set point in cooling mode	-99.9 to 99.9		30.0	user	ANA	17
Auxiliary heater in cooling mode Diff.	Heater differential support in cooling mode	-99.9 to 99.9		1.0	user	ANA	18
Auxiliary heater in heating mode Setpoint	Support heater 1 set point in heating mode	15.0 to 50.0		25.0	user	ANA	19
Auxiliary heater in heating mode Diff.	Support heater 1 differential in heating mode	0.0 to 10.0		5.0	user	ANA	20
Auxiliary heater in heating mode (2)Setpoint	Support heater 2 set point in heating mode	15.0 to 50.0		24.0	user	ANA	21
Auxiliary heater in heating mode (2) Diff.	Support heater 2 differential in heating mode	0.0 to 10.0		5.0	user	ANA	22
Aux.heater HP mode enable by tank Setpoint	Boiler temperature set point to enable support heater	-3.0 to 50.0	°C 10.0 user
Aux.heater HP mode enable by tank Diff.	Boiler temperature differential to enable support heater	0.0 to 10.0	°C	2.0	user
Aux.heater HP mode enable by ext.temp.Setpoint	Outside air set point to enable support heater	-30.0 to 30.0	°C	-7.0	user
Aux.heater HP mode enable by ext.temp. Diff.	Outside air differential to enable support heater	0.0 to 10.0	°C	2.0	user
Auxiliary heater activation delay on heating mode	Support heater 2 differential in heating mode	0 to 60	min	15	user	INT	10
AntifreezeProbe:	Select probe for cooling support control in air/air units	OUTLET TEMP. ROOM TEMP.		OUTLET TEMP.	user
Automatic turn ON in antifreeze	Device start-up mode in antifreeze with unit off	DISABLED ON RES & PUMP ON RES & UNIT ONLY RESISTANCE ON		DISABLED	user	INT	11 R
Defrost config.Start/End:	Select values for the start and end defrost control	TEMPERATURE PRESSURE EXTERNAL CONTACT PRESSURE/TEMP.		TEMPERATURE	user	INT	12 R
Defrost config.Type:	Type of defrost between circuits	SIMULTANEOUS SEPARATE		SIMULTANEOUS	user
Defrost end by threshold	Select end defrost mode	TIME TEMP/PRESSURE		TIME	user
Defrost Delay	Defrost activation delay	1 to 32000	s	1800	user	INT	13
Defrost Start	Start defrost threshold	-99.0 to 99.9	°C/bar	2.0	user	ANA	5
Defrost End	End defrost threshold	-99.0 to 99.9	°C/bar	12.0	user	ANA	6
Defrost Max.time	Maximum defrost duration	0 to 32000	s	300	user	INT	14
Defrost Min.time	Minimum defrost duration	0 to 32000	s	0	user	INT	15
Delay between defrost same circuit	Delay between defrosts in the same circuit	0 to 32000	s	0	user	INT	16
Delay between defrost differ.circ.	Delay between defrosts in different circuits	0 to 32000	s	0	user	INT	17
Defrost Compressor force OFF on start/end defrost	Forced compressor off time at start and end defrost	0 to 999	s	60	manufacturer	INT	18 R
Defrost Reversal cycle delay	Delay in reversing refrigerating cycle for defrost	0 to 999	s	30	manufacturer	INT	19 R
Sliding defrost Enable:	Enable sliding defrost function	N / Y		N	user
Sliding defrost Defrost start min.Set point	Minimum set point to start defrost accessible with sliding defrost function	0.0 to 99.9	°C/bar	0.5 user ANA 23 R

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
Sliding defrost External temperature Start	Outside temperature threshold to start sliding defrost action	99.9 to 99.9	°C	0.0	user
Sliding defrost External temperature End	Outside temperature threshold for maximum sliding defrost action -99.9 to 99.9 °C 0.0 user
Manual defrost Enable manual defrost operation DISABLED		ENABLED		DISABLED	user
Circuit 1: Request forced defrost in circuit 1 OFF		START		OFF	user
Circuit 2: Request forced defrost in circuit 2 OFF		START		OFF	user
Transducer high pressure alarm Se point	High pressure alarm set point from transducer	0 to 99.9	bar	21.0	manufacture	ANA	24	RW
Transducer high pressure alarm Diff.	High pressure alarm differential from transducer	0 to 99.9	bar	2.0	manufacture	ANA	25	RW
Low pressure alarm Summer set	Low pressure alarm set point from transducer (cooling)	0 to 99.9	bar	2.0	manufacture
Low pressure alarm Winter set	Low pressure alarm set point from transducer (heating)	0 to 99.9	bar	0.5	manufacture
Low pressure alarm Defrost set	Low pressure alarm set point from transducer (defrost)	0 to 99.9	bar	1.0	manufacture
LP delay switch-on Summer	Low pressure alarm delay when starting the compressors (cooling)	0 to 999	s	40	user	INT	20	RW
LP delay switch-on Winter	Low pressure alarm delay when starting the compressors (heating)	0 to 999	s	40	user	INT	21	RW
LP delay switch-on Defrost	Low pressure delay when starting the compressors (defrost)	0 to 999	s	40	user	INT	22	RW
Low pressure alarm Regime delay	Low pressure alarm delay in steady operation	0 to 999	s	0.0	user	INT	23	RW
Low pressure alarm Diff.	Low pressure alarm differential from transducer	0 to 99.9	bar	2.0	user
Evaporator flow alarm Start delay	Evaporator flow switch alarm delay at start-up	0 to 999	s	15	user	INT	24	RW
Evaporator flow alarm Regime delay	Evaporator flow switch alarm delay in steady operation	0 to 999	s	3	user	INT	25	RW
Condenser flow alarm Start delay	Condenser flow switch alarm delay at start-up	0 to 999	s	15	user	INT	26	RW
Condenser flow alarm Regime delay	Condenser flow switch alarm delay in steady operation	0 to 999	s	3	user	INT	27	RW
Automatic alarms reset Events n.	Number of alarm events to switch from automatic to manual reset	0 to 4		1	user	INT	28	RW
Automatic alarms reset Time	Period of repeated alarm events to switch from automatic to manual reset	1 to 99	min	60	user	INT	29	RW
Alarms reset selection Comp.overload	Select type of compressor thermal overload alarm reset	0 to 1		0	user
Alarms reset selection Fans overload	Select type of fan thermal overload alarm reset	0 to 1		0	user
Alarms reset selection Low pressure	Select type of low pressure alarm reset	0 to 1		0	user
Alarms reset selection High pressure	Select type of high pressure alarm reset	0 to 1		0	user
Configuration	Configure type of unit	AIR/AIR CHILLER AIR/AIR CHILLER+HEAT P. WATER/AIR CHILLER WATER/AIR CHILLER+HEAT P. WATER/WATER CHILLER WATER/WATER CHILLER+HEAT P. WATER/AIR CONDENSING WATER/AIR CONDENSING+HEAT P.		AIR/AIR CHILLER	manufacture
	Type of condensing unit control	ANALOGUE CONTROL DIGITAL CONTROL		ANALOGUE CONTROL	manufacture
Inv.selection:	Select type of reverse cycle for water/water units	WATER GAS		WATER	manufacture

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
Comp./circuits number:	Total number of compressors / number of refrigerant circuits on unit 1/1	2/13/12/24/26/2		1/1 manufacture
Rotation Select type of compressor / refrigerant circuit rotation L.I.F.O.		F.I.F.O.TIME		L.I.F.O. manufacture	INT	30 R	W
Evaporator number:	Select number of evaporators 1	2		1 manufacture
Remote compressor control management Type	Select type of condensing unit control from analogue input STEPS	PROPORTIONAL		STEPS manufacture
EVD400 drivers number:	Number of EVD400 drivers connected	0 to 4		0 manufacture	INT	31 R	W
Reversal cycle valve logic	4-way valve operating logic for the reversal of the refrigerant/water circuit	N.C.N.O.		N.O.	manufacture	DIG	4	RW
Pumps number:	Number of evaporator pumps 1 to 2	1 manufacture
Rotation type	Select type of evaporator pump rotation	STARTS TIME		STARTS	manufacture
Pumps/Fan running mode	Evaporator pump/main fan operating mode	ALWAYS OFF ALWAYS ON ON WITH COMP.ON ON/OFF BURST		ALWAYS ON	manufacture	INT	32 R	W
Condenser pump running mode	Condenser pump operating mode	ALWAYS OFF ALWAYS ON ON WITH COMP.ON		ALWAYS ON	manufacture
Pumps/Fan burst running Time ON:	ON time in burst operation	0 to 9999	s	60	user	INT	33	RW
Pumps/Fan burst running Time OFF:	OFF time in burst operation	0 to 9999	s	60	user	INT	34	RW
Pump rotation every (hours):	Operating hour threshold for the rotation of the evaporator pumps	0 to 9999	h	12	user	INT	35	RW
Enable on/off by digital input	Enable unit ON/OFF from digital input	N/Y		N	user
Enable sum/win by digital input	Enable cooling/heating selection from digital input	N/Y		N	user
Enable on/off by supervisor	Enable unit ON/OFF from supervisor	N/Y		N	user	INT	55	RW
Enable sum/win by supervisor	Enable cooling/heating selection from supervisor	N/Y		N	user	INT	45	RW
Auto reversRunning mode delay (summer/winter)	Force-off time device for change working mode (CH-HP)	0 to 999	s	0	user	INT	36	RW
Supervisor protocol type	Select type of serial protocol for supervisory network	CAREL MODBUS LONWORKS Rs232 MODEM ANALOGUE GSM MODEM		CAREL	user
Supervisor baud rate	Serial port communication speed for supervisory network	1200 (RS485/RS422)2400 (RS485/RS422)4800 (RS485/RS422)9600 (RS485/RS422)19200 (ONLY RS485)		19200(ONLY RS485)	user
Supervisor Ident N.:	Serial identification number for supervisory network	0 to 200		1	user
Max phone n.:	Phone book capacity (number of telephone numbers saved)	1 to 4		1	user
Phone book number:	Active telephone number in phone book	1 to 4			user
	Digits that make up the telephone number	0123456789#*,@^			user
Modem password:	Modem password	0 to 9999		0	user
Modem rings:	Number of rings	0 to 9		3	user
Modem type:	Type of modem	Tone Pulse		Tone	user

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
SMS send test: Send test SMS (an SMS is sent with a test message) N/Y user
SMS send enable: Enable send SMS in response to an alarm N/Y				Y	user
EXTERNAL MODEM GSM MODEM Status:	Status of the modem Ext. modem standby	Initialisation Search GSM network Modem standby Modem alarm Init. error Enable PIN GSM network not found SMS saturation Send SMS... Modem connected... Modem calling...
Field:	Percentage of signal reception for the GSM modem	0 to 100	%
	Temporary modem error	Temp. error
	Permanent modem error	Perm. error
Time next call	Waiting time for new call after failed attempt	0	s	0
Language mask visualization on start	Enable display of change language screen when starting unit	N/Y		Y	user
Reset event SMS	Delete list of SMS messages sent or to be sent	N/Y		N	manufacturer
Restore default values	Start board memory delete procedure and restore default values	N/Y		N	manufacturer
Condensation Regulation type	Type of condenser control	CIRC.ON/OFF STATUS PRESSURE TEMPERATURE		PRESSURE	manufacturer	INT	37	RW
Condensation Condenser number	Number of condensers installed	12		1 manufacture		DIG	3	RW
Condensation Devices type	Type of condensing devices controlled	INVERTER FANS		INVERTER	manufacturer	DIG	21	RW
Condensation Fans number	Total number of fans installed	1 to 4		1 manufacture
Fans type Frequency	Frequency of power supply for fan control by inverter	5060	Hz	50	manufacturer
Cond.fan forcing time on start	Forcing time when starting the condenser (temperature control)	0 to 999	s	0	manufacturer	INT	38	RW
PWM Phase cut Triac max.:	Maximum voltage threshold for Triac	0 to 100 % 75 manufacture
PWM Phase cut Triac min.:	Minimum voltage threshold for Triac	0 to 100 % 25 manufacture
PWM Phase cut Range wave:	Amplitude impulse for phase control	0.0 to 10.0	ms	2.5	manufacturer
Fan parameters summer Setpoint	Condensing set point (cooling)	0.0 to 99.9	°C/bar	14.0	user	ANA	11	RW
Fan parameters summer Diff.	Condenser differential (cooling)	-99.9 to 99.9	°C/bar	2.0	user	ANA	12	RW
Fan parameters winter Setpoint	Evaporation set point (heating)	0.0 to 99.9	°C/bar	14.0	user
Fan parameters winter Diff.	Evaporation differential (heating)	-99.9 to 99.9	°C/bar	2.0	user
Fan minimum speed diff.	Differential for fan operation at minimum speed	-99.9 to 99.9	°C/bar	5.0	user
Inverter Max.speed	Maximum fan speed with inverter	0.0 to 10.0	V	10.0	manufacturer
Inverter Min.speed	Minimum fan speed with inverter	0.0 to 10.0	V	0.0	manufacturer
Inverter Speed-up time	Speed-up time with inverter	0 to 999	s	30	manufacturer	INT	39	RW
HP prevent Enabled	Enable high pressure prevent	N/Y		N	manufacturer
HP prevent Probe	Select the prevent probe	PRESSURE TEMPERATURE		PRESSURE	manufacturer
HP prevent (cooling model) Setpoint	High pressure prevent set point (cooling)	-99.9 to 99.9	°C/bar	20.0	user
HP prevent (cooling mode) Diff.	High pressure prevent differential (cooling)	0 to 99.9	°C/bar	2.0	user
LP prevent (heating mode) Setpoint	Low pressure prevent set point (heating)	-99.9 to 99.9	°C/bar	3.0	user
LP prevent (heating mode) Diff.	Low pressure prevent differential (heating)	0 to 99.9	°C/bar	2.0	user

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
Fan run with condensation probe fault	Condenser operating mode in the event of probe fault FORCE OFF	FORCE ON WITH COMP ON		FORCE ON WITH COMP ON	user	INT	40	WR
Prevent output delay	Delay to exit the prevent function 0 to 999 s 0 user INT 41 R							W
Low-noise Start hour	Start hour for low-noise operation	0		0			23
Low-noise Start hour	Start minutes for low-noise operation	0 to 59 min 0 user
Low-noise End hour	End hour for low-noise operation	0 to 23 h 0 user
Low-noise End hour	End minutes for low-noise operation	0 to 59 min 0 user
Low-noise Setpoint Summer	Low-noise set point in cooling	0.0 to 99.9	°C/bar	0.0	user
Low-noise Setpoint Winter	Low-noise set point in heating	0.0 to 99.9	°C/bar	0.0	user
Actual setpoint	Active set point		°C		direct	ANA	57	R
Compens.B7	Current outside temperature compensation value (B7)		°C		direct	ANA	58	R
Ext.set.B8	Current set point from analogue input B8		°C			ANA	59	R
Summer setpoint	Cooling set point	-99.9 to 99.9	°C	12.0	direct	ANA	1	RW
Winter setpoint	Heating set point	-99.9 to 99.9	°C	45.0	direct	ANA	2	RW
BB external setpoint Summer min	Minimum set point value from probe BB (cooling)	-99.9 to 99.9	°C	7.0	direct
BB external setpoint Summer max	Maximum set point value from probe BB (cooling)	-99.9 to 99.9	°C	17.0	direct
BB external setpoint Winter min	Minimum set point value from probe BB (heating)	-99.9 to 99.9	°C	40.0	direct
BB external setpoint Winter max	Maximum set point value from probe BB (heating)	-99.9 to 99.9	°C	50.0
Temperature regulation band	Temperature control band	0 to 99.9	°C	3.0	user	ANA	4	RW
Summer temperature setpoint limits Low	Minimum limit for setting the set point in cooling	-99.9 to 99.9	°C	-12.2	user	ANA	7	RW
Summer temperature setpoint limits High	Maximum limit for setting the set point in cooling	-99.9 to 99.9	°C	48.9	user	ANA	8	RW
Winter temperature setpoint limits Low	Minimum limit for setting the set point in heating	-99.9 to 99.9	°C	10.0	user	ANA	9	RW
Winter temperature setpoint limits High	Maximum limit for setting the set point in heating	-99.9 to 99.9	°C	93.0	user	ANA	10	RW
Setpoint compensation enabled	Enable set point compensation	N/Y		N	user
Maximum compensation	Maximum compensation value	-99.9 to 99.9	°C	5.0	user	ANA	26	RW
Summer compens. Start temp.	Minimum outside temperature for compensation in cooling	-99.9 to 99.9	°C	25.0	user	ANA	27	RW
Summer compens. End temp.	Maximum outside temperature for compensation in cooling	-99.9 to 99.9	°C	35.0	user	ANA	28	RW
Winter compens. Start temp.	Minimum outside temperature for compensation in heating	-99.9 to 99.9	°C	10.0	user	ANA	29	RW
Winter compens. End temp.	Maximum outside temperature for compensation in heating	-99.9 to 99.9	°C	0.0	user	ANA	30	RW
Temperature regulation type	Type of temperature control	INLET (PROP.) OUTLET (DEAD ZONE)		INLET (PROP.)	manufacturer
Inlet Regulation Type	Proportional or proportional + integral inlet control	P P=1		P manufacture
Inlet Regulation Integratio	Integral time for proportional + integral control	0 to 9999	s	600	manufacturer	INT	42 R	W
Outlet regulation Max.time ON	Maximum time between starts with outlet control	0 to 9999	s	20	manufacturer	INT	43 R	W
Outlet regulation Min.time ON	Minimum time between starts with outlet control	0 to 9999	s	20	manufacturer	INT	44 R	W
Outlet regulation Max.time OFF	Maximum time between stops with outlet control	0 to 9999	s	10	manufacturer	INT	45 R	W
Outlet regulation Min.time OFF	Minimum time between stops with outlet control	0 to 9999	s	10	manufacturer	INT	46 R	W

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
Outlet regulation Request time variation differential	Differential for calculating the time between steps with outlet control	99.9 to 99.9	°C	2.0	manufacturer	ANA	31 R	W
Temperature regulation type	Select reference value for temperature control CONTROL PROBE	OUTSIDE TEMP. CONTROL		CONTROL PROBE	manufacturer	INT	47 R	W
Force OFF outlet regulation Summer	Forced shutdown threshold with outlet control (cooling) -99.9 to 99.9 °C	5.0 manufacture			1	ANA	32 R	W
Force OFF outlet regulation Winter	Forced shutdown threshold with outlet control (heating) -99.9 to 99.9 °C	47.0 manufacture			1
External temp.limit Setpoint	Outside temperature set point limit	-99.9 to 99.9	°C	-10.0	user	ANA	33	RW
External temp.limit Differential	Outside temperature differential limit	-9.9 to 9.9	°C	2.0	user	ANA	34	RW
Clock config. Hour	Hour setting	0 to 23	h			INT	49	RW
Clock config. Hour	Minutes setting	0 to 59	min			INT	48	RW
Clock config. Date	Day setting 1 to 31 day
Clock config. Date	Month setting	1 to 12	month
Clock config. Date	Year setting	0 to 99	year
Time-zones On-off unit	Enable unit ON-OFF time bands	0 to 1		0	user
Time-zones Temp.setpoint	Enable set point time bands	0 to 1		0	user
On-off unit F1-1 ON	Band 1. First on hour in the day	0 to 23	h	0	user
On-off unit F1-1 ON	Band 1. First on minutes in the day	0 to 59	min	0	user
On-off unit F1-1 OFF	Band 1. First off hour in the day	0 to 23	h	0	user
On-off unit F1-1 OFF	Band 1. First off minutes in the day	0 to 59	min	0	user
On-off unit F1-2 ON	Band 1. Second on hour in the day	0 to 23	h	0	user
On-off unit F1-2 ON	Band 1. Second on minutes in the day	0 to 59	min	0	user
On-off unit F1-2 OFF	Band 1. Second off hour in the day	0 to 23	h	0	user
On-off unit F1-2 OFF	Band 1. Second off minutes in the day	0 to 59	min	0	user
On-off unit F2 ON	Band 2. On hour in the day	0 to 23	h	0	user
On-off unit F2 ON	Band 2. On minutes in the day	0 to 59	min	0	user
On-off unit F2 OFF	Band 2. Off hour in the day	0 to 23	h	0	user
On-off unit F2 OFF	Band 2. Off minutes in the day	0 to 59	min	0	user
On-off unit Lun:	Select band F1, F2, F3 or F4 for Monday F1	F2F3F4		0	user
On-off unit Tue:	Select band F1, F2, F3 or F4 for Tuesday	F1,F2,F3,F4		0	user
On-off unit Wed:	Select band F1, F2, F3 or F4 for Wednesday	F1, F2, F3, F4		0	user
On-off unit Thu:	Select band F1, F2, F3 or F4 for Thursday	F1, F2, F3, F4		0	user
On-off unit Fri:	Select band F1, F2, F3 or F4 for Friday	F1, F2, F3, F4		0	user
On-off unit Sat:	Select band F1, F2, F3 or F4 for Saturday	F1, F2, F3, F4		0	user
On-off unit Sun:	Select band F1, F2, F3 or F4 for Sunday	F1, F2, F3, F4		0	user
Setpoint temp. Start Time-Z 1	Start hour for set point band 1	0 to 23	h	0	user
Setpoint temp. Start Time-Z 1	Start minutes for set point band 1	0 to 59	min	0	user
Setpoint temp. Summer	Cooling set point in band 1	-99.9 to 99.9	°C	0	user	ANA	35	RW
Setpoint temp. Winter	Heating set point in band 1	-99.9 to 99.9	°C	0	user	ANA	36	RW
Setpoint temp. Start Time-Z 2	Start hour for set point band 2	0 to 23	h	0	user
Setpoint temp. Start Time-Z 2	Start minutes for set point band 2	0 to 59	min	0	user
Setpoint temp. Summer	Cooling set point in band 2	-99.9 to 99.9	°C	0	user	ANA	37	RW

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/1 nt/Dig	Supervisor address	R/R-W
Setpoint temp.Winter	Heating set point in band 2 -99.9 to 99.9 °C 0 user ANA 38 R							W
Setpoint temp.Start Time-Z 3	Start hour for set point band 3 0 to 23 h 0 user
Setpoint temp.Start Time-Z 3	Start minutes for set point band 3 0 to 59 min 0 user
Setpoint temp.Summer	Cooling set point in band 3 -99.9 to 99.9 °C 0 user ANA 39 R							W
Setpoint temp.Winter	Heating set point in band 3 -99.9 to 99.9 °C 0 user ANA 40 R							W
Setpoint temp.Start Time-Z 4	Start hour for set point band 4 0 to 23 h 0 user
Setpoint temp.Start Time-Z 4	Start minutes for set point band 4 0 to 59 min 0 user
Setpoint temp.Summer	Cooling set point in band 4 -99.9 to 99.9 °C 0 user ANA 41 R							W
Setpoint temp.Winter	Heating set point in band 4 -99.9 to 99.9 °C 0 user ANA 42 R							W
Enable clock board	Enable control of the clock board	N/Y		N	manufacture:
EVD type	Type of EVD 400 driver connected to the uChiller3 board	EVD400 pLAN		EVD400 pLAN	manufacture:	INT	78 R	W
EVD probes type	Type of probes connected to the driver	Not selectedSHeat NTC P(4 20)mASHeat NTC-P(rat)SHeat NTC-NTCSHeat Pt1000-PSHeat NTCht-P(rat)PID PressPID NTCPID NTC HTPID Pt1000		Not selected	manufacture:	INT	79 R	W
PID direction	Direction of PID control (direct or reverse) DIR	REV		DIR manufacture	DIG	164	RW
step	Maximum number of steps displayed for the type of valve selected				manufacture:
Valve type	Type of valve selectable	Not selectedALCO EX5ALCO EX6ALCO EX7ALCO EX8SPORLAN 0.5-20tonsSPORLAN 25-30tonsSPORLAN 50-250tonsCAREL E2V**PCAREL E2V**ADANFOSS ETS50 AST-gDANFOSS ETS100 AST-gCUSTOM		Not selected	manufacture:	INT	80 R	W
Bi flow valve:	Enable bi-directional valve (chiller/heat pump operation on the same valve/driver)	N/Y		N	manufacture:	DIG	165	RW
Refrigerant	Set type of gas used	----R22R134aR404aR407cR410aR507cR290R600R600aR717R744		----	manufacture:	INT	81 R	W
Custom valve config.Minimum steps	Minimum number of steps for custom valve	0 to 8100		0	manufacture:
Custom valve config.Maximum steps	Maximum number of steps for custom valve	0 to 8100		0	manufacture:
Custom valve config.Closing steps	Total number of steps for custom valve	0 to 8100		0	manufacture:
Custom valve config.Opening EXTRAs	Use extra opening step on custom valve	N/Y		N	manufacture:	DIG	166	RW
Custom valve config.Closing EXTRAs	Use extra closing step on custom valve	N/Y		N	manufacture:	DIG	167	RW
Custom valve config.Phase current	Operating current of the custom valve	0 to 1000	mA	0	manufacture:
Custom valve config.Still current	Holding current of the custom valve	0 to 1000	mA	0	manufacture:
Custom valve config.Step rate	Impulse frequency of the custom valve	32 to 501	Hz	0	manufacture:
Custom valve config.Duty-cycle	Duty cycle of the custom valve	0 to 100	%	0	manufacture:
EEV stand-by stepsEEV position with0% power demand	Position valve with capacity request equal to 0%	0 to 8100		0	manufacture:	INT	82 R	W

μC3

Menu description Extended description Min/max limits		Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
S1 probe limits pressure limitsMin value	Minimum end scale of pressure probe S1 -9.9 to 99.9 barg -1.0 manufacture				ANA	80 R	W
S1 probe limits pressure limitsMax value	Maximum end scale of pressure probe S1 0.0 to 99.9 barg 9.3 manufacture				ANA	81 R	W
Alarms delayLow SuperHeat	Low SuperHeat alarm delay 0 to 3600 s 120 manufacture				INT	83 R	W
Alarms delayHigh SuperHeat	High SuperHeat alarm delay	0 to 500	min	20	manufacture:	INT	84 R
Alarms delayLOP	LOP alarm delay	0 to 3600 s 120 manufacture			INT	85 R	W
Alarms delayMOP	MOP alarm delay	0 to 3600 s 0 manufacture			INT	86 R	W
Alarms delayDelay probe error	Probe alarm signal delay	0 to 999	s	10	manufacture:	INT	87 R
CH-Circuit/EEV RatioAuto	Percentage of EEV opening from autosetup		%		manufacture:
CH-Circuit/EEV Ratio	Settable percentage of EEV opening in chiller mode	0 to 100	%		manufacture:
CH-Proportional gainAuto	Proportional gain from autosetup				manufacture:
CH-Proportional gain	Settable proportional gain in chiller mode	0 to 99.9			manufacture:
CH-Integral timeAuto	Integral time from autosetup in chiller mode		s		manufacture:
CH-Integral time	Settable integral time in chiller mode	0 to 999	s		manufacture:
CH-SuperHeat set C1Auto	SuperHeat set point from autosetup		°C		manufacture:
CH-SuperHeat set C1	Settable SuperHeat set point in chiller mode circuit 1	2.0 to 50.0	°C		manufacture:
CH-Low SuperHeat C1Auto	Low SuperHeat from autosetup		°C		manufacture:
CH-Low SuperHeat C1	Settable low SuperHeat in chiller mode circuit 1	-4.0 to 21.0	°C		manufacture:
CH-SuperHeat set C2Auto	SuperHeat set point from autosetup		°C		manufacture:
CH-SuperHeat set C2	Settable SuperHeat set point in chiller mode circuit 2	2.0 to 50.0	°C		manufacture:
CH-Low SuperHeat C2Auto	Low SuperHeat from autosetup		°C		manufacture:
CH-Low SuperHeat C2	Settable low SuperHeat in chiller mode circuit 2	-4.0 to 21.0	°C		manufacture:
HP-Circuit/EEV RatioAuto	Percentage of EEV opening from autosetup		%		manufacture:
HP-Circuit/EEV Ratio	Settable percentage of EEV opening in heat pump mode	0 to 100	%		manufacture:
HP-Proportional gainAuto	Proportional gain from autosetup				manufacture:
HP-Proportional gain	Settable proportional gain in heat pump mode	0 to 99.9			manufacture:
HP-Integral timeAuto	Integral time from autosetup in heat pump mode		s		manufacture:
HP-Integral time	Settable integral time in heat pump mode	0 to 999	s		manufacture:
HP-SuperHeat set C1Auto	SuperHeat set point from autosetup		°C		manufacture:
HP-SuperHeat set C1	Settable SuperHeat set point in heat pump mode circuit 1	2.0 to 50.0	°C		manufacture:
HP-Low SuperHeat C1Auto	Low SuperHeat from autosetup		°C		manufacture:
HP-Low SuperHeat C1	Settable low SuperHeat in heat pump mode circuit 1	-4.0 to 21.0	°C		manufacture:
HP-SuperHeat set C2Auto	SuperHeat set point from autosetup		°C		manufacture:
HP-SuperHeat set C2	Settable SuperHeat set point in heat pump mode circuit 2	2.0 to 50.0	°C		manufacture:
HP-Low SuperHeat C2Auto	Low SuperHeat from autosetup		°C		manufacture:
HP-Low SuperHeat C2	Settable low SuperHeat in heat pump mode circuit 2	-4.0 to 21.0	°C		manufacture:
DF-Circuit/EEV RatioAuto	Percentage of EEV opening from autosetup		%		manufacture:
DF-Circuit/EEV Ratio	Settable percentage of EEV opening in defrost mode	0 to 100	%		manufacture:
DF-Proportional gainAuto	Proportional gain from autosetup				manufacture:
DF-Proportional gain	Settable proportional gain in defrost mode	0 to 99.9			manufacture:
DF-Integral timeAuto	Integral time from autosetup in defrost mode		s		manufacture:
DF-Integral time	Settable integral time in defrost mode	0 to 999	s		manufacture:
DF-SuperHeat set C1Auto	SuperHeat set point from autosetup		°C		manufacture:
DF-SuperHeat set C1	Settable SuperHeat set point in defrost mode circuit 1	2.0 to 50.0	°C		manufacture:
DF-Low SuperHeat C1Auto	Low SuperHeat from autosetup		°C		manufacture:
DF-Low SuperHeat C1	Settable low SuperHeat in defrost mode circuit 1	-4.0 to 21.0	°C		manufacture:

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/nt/Dig	Supervisor address	R/R-W
DF-SuperHeat set C2 Auto	SuperHeat set point from autosetup °C manufacture
DF-SuperHeat set C2	Settable SuperHeat set point in defrost mode circuit 2	2.0 to 50.0	°C		manufacture:
DF-Low SuperHeat C2 Auto	Low SuperHeat from autosetup °C manufacture
DF-Low SuperHeat C2	Settable low SuperHeat in defrost mode circuit 2	-4.0 to 21.0	°C		manufacture:
SHeat dead zone +/- Auto	SuperHeat dead zone from autosetup °C manufacture
SHeat dead zone +/- Settable SuperHeat dead zone 0.0 to 9.9 °C manufacture
Derivative time Auto	Derivative time from autosetup		s		manufacture:
Derivative time	Settable derivative time	0 to 999	s		manufacture:
Low SHeat int.time Auto	Low SuperHeat integral time from autosetup		s		manufacture:
Low SHeat int.time	Settable integral time low SuperHeat	0.0 to 30.0	s		manufacture:
LOP integral time Auto	LOP integral time from autosetup		s		manufacture:
LOP integral time	Settable LOP integral time	0.0 to 25.5	s		manufacture:
MOP integral time Auto	MOP integral time from autosetup		s		manufacture:
MOP integral time	Settable MOP integral time	0.0 to 25.5	s		manufacture:
MOP startup delay Auto	Start MOP delay from autosetup		s		manufacture:
MOP startup delay	Settable start MOP delay	0 to 500	s		manufacture:
Dynamic proportional gain?	Select dynamic proportional control mode	0 to 1			manufacture:	DIG	168	RW
Blocked valve check Auto	EEV stop control from autosetup		s		manufacture:
Blocked valve check	Settable EEV stop control	0 to 999	s		manufacture:
Hi TCond.protection Auto	High condensing temperature alarm from autosetup		°C		manufacture:
Hi TCond.protection	Settable high condensing temperature alarm	0.0 to 99.9	°C		manufacture:
Hi TCond.int.time Auto	Condensing temperature integral time from autosetup		s		manufacture:
Hi TCond.int.time	Settable condensing temperature integral time	0.0 to 25.5	s		manufacture:
Manual mng.driverer 1 EEV Mode	Driver 1 management mode (automatic or manual)	AUTO MAN.			manufacture:	DIG	160	RW
Manual mng.driverer 1 Requested steps	Settable steps required with manual management on driver 1	0 to 8100			manufacture:
Manual mng.driverer 1 EEV Position	Current position read for valve 1				manufacture:	INT	97	R
Manual mng.driverer 2 EEV Mode	Driver 2 management mode (automatic or manual)	AUTO MAN.			manufacture:	DIG	161	RW
Manual mng.driverer 2 Requested steps	Settable steps required with manual management on driver 2	0 to 8100			manufacture:
Manual mng.driverer 2 EEV Position	Current position read for valve 2				manufacture:	INT	98	R
Manual mng.driverer 3 EEV Mode	Driver 3 management mode (automatic or manual)	AUTO MAN.			manufacture:	DIG	162	RW
Manual mng.driverer 3 Requested steps	Settable steps required with manual management on driver 3	0 to 8100			manufacture:
Manual mng.driverer 3 EEV Position	Current position read for valve 3				manufacture:	INT	99	R
Manual mng.driverer 4 EEV Mode	Driver 4 management mode (automatic or manual)	AUTO MAN.			manufacture:	DIG	163	RW
Manual mng.driverer 4 Requested steps	Settable steps required with manual management on driver 4	0 to 8100			manufacture:
Manual mng.driverer 4 EEV Position	Current position read for valve 4				manufacture:	INT	100	R
Driver 1 status System waiting for	Go ahead active, driver 1 status	NO FAULT VALVE NOT CLOSED BATT.CHARGING EEPROM ERROR			manufacture:	INT	93	RW
Go ahead? Ignore driver 1 status	0 to 1		manufacture			DIG	169	RW
Driver 2 status System waiting for	Go ahead active, driver 2 status	NO FAULT VALVE NOT CLOSED BATT.CHARGING EEPROM ERROR			manufacture:	INT	94	RW
Go ahead? Ignore driver 2 status	0 to 1		manufacture			DIG	170	RW
Driver 3 status System waiting for	Go ahead active, driver 3 status	NO FAULT VALVE NOT CLOSED BATT.CHARGING EEPROM ERROR			manufacture:	INT	95	RW
Go ahead? Ignore driver 3 status	0 to 1		manufacture			DIG	171	RW

μC3

Menu description Extended description Min/max limits			Unit of measure	Default	Access	Ana/Int/Dig	Supervisor address	R / R-W
Driver 4 status System waiting for	Go ahead active, driver 4 status NO FAULT	VALVE NOT CLOSEDBATT. CHARGINGEEPROM ERROR			manufacture:	INT	96 R	W
Go ahead? Ignore driver 4 status 0 to 1 manufacture					I	DIG	172 R	W
Drv 1 probes offset S1	Probe S1 offset, driver 1 -9.9 to 9.9 °C/barg manufacture				I
Drv 1 probes offset S2	Probe S2 offset, driver 1 -9.9 to 9.9 °C/barg manufacture				I
Drv 1 probes offset S3	Probe S3 offset, driver 1 -9.9 to 9.9 °C/barg manufacture				I
Drv 2 probes offset S1	Probe S1 offset, driver 2 -9.9 to 9.9 °C/barg manufacture				I
Drv 2 probes offset S2	Probe S2 offset, driver 2 -9.9 to 9.9 °C/barg manufacture				I
Drv 2 probes offset S3	Probe S3 offset, driver 2 -9.9 to 9.9 °C/barg manufacture				I
Drv 3 probes offset S1	Probe S1 offset, driver 3 -9.9 to 9.9 °C/barg manufacture				I
Drv 3 probes offset S2	Probe S2 offset, driver 3 -9.9 to 9.9 °C/barg manufacture				I
Drv 3 probes offset S3	Probe S3 offset, driver 3 -9.9 to 9.9 °C/barg manufacture				I
Drv 4 probes offset S1	Probe S1 offset, driver 4 -9.9 to 9.9 °C/barg manufacture				I
Drv 4 probes offset S2	Probe S2 offset, driver 4 -9.9 to 9.9 °C/barg manufacture				I
Drv 5 probes offset S3	Probe S3 offset, driver 4 -9.9 to 9.9 °C/barg manufacture				I
Circuit/EEV Ratio for startup opening	Valve opening percentage when starting 0 to 100 % manufacture				I	INT	88 R	W
Compressor or Unit	Type of compressor/unit Not selected	RECIPROCATINGSCREWSCROLLQUICK CASE/COLD RM.CASE/COLD ROOM			manufacture:	INT	89 R	W
Capacity control	Type of capacity-control (if present)	Not selectedNO/STEPSLOW CONTINUOUSFAST CONTINUOUS			manufacture:	INT	90 R	W
Evaporator type Cool	Type of evaporator used in chiller mode	Not selectedFINSPLATES/TUBESFAST FINNEDSLOW FINNED			manufacture:	INT	91 R	W
Evaporator type Heat	Type of evaporator used in heat pump mode	Not selectedFINSPLATES/TUBESFAST FINNEDSLOW FINNED			manufacture:	INT	92 R	W
Minimum saturated temp Cool mode	Minimum saturated temperature in chiller mode	-70.0 to 50.0	°C		manufacturer:	ANA	82 R	W
Minimum saturated temp Heat mode	Minimum saturated temperature in heat pump mode	-70.0 to 50.0	°C		manufacturer:	ANA	83 R	W
Minimum saturated temp Defr.Mode	Minimum saturated temperature in defrost mode	-70.0 to 50.0	°C		manufacturer:	ANA	84 R	W
Maximum saturated temp Cool mode	Maximum saturated temperature in chiller mode	-50.0 to 90.0	°C		manufacturer:	ANA	85 R	W
Maximum saturated temp Heat mode	Maximum saturated temperature in heat pump mode	-50.0 to 90.0	°C		manufacturer:	ANA	86 R	W
Maximum saturated temp Defr.Mode	Maximum saturated temperature in defrost mode	-50.0 to 90.0	°C		manufacturer:	ANA	87 R	W
High SuperHeat alarm threshold Auto	Current high SuperHeat alarm threshold		°C		manufacturer:
High SuperHeat alarm threshold	Settable high SuperHeat alarm threshold	0.0 to 100.0	°C		manufacturer:	ANA	88 R	W

5. Connections

Assembly instructions

Maximum NTC/ratiometric probe connection cable length: 10 m

Maximum digital input connection cable length: 10 m

Maximum power output connection cable length: 5 m

Maximum fan control output connection cable length: 5 m

Maximum power cable length: 3 m

Power supply

A Class II safety transformer with a minimum rating of 50 VA must be used in the installation to supply just one chiller ^3 . The power supply to the chiller ^3P controller (or chiller ^3 controllers) should be separated from the power supply to the other electrical devices (contactors and other electromechanical components) inside the electrical panel. If the secondary of the transformer is earthed, make sure that the earth wire is connected to terminal G0. This is true for all the devices connected to the chiller ^3P .

IMPORTANT

A fuse must be fitted in series with the power supply, with the following characteristics: 250 Vac 2 A slow-blow (2 AT).

\*Direct current connection

Warning, for DC power supply, follow the instructions as shown in the following figure:

graph TD
    A["DC power supply"] --> B["J1"]
    B --> C["Power supply for VZC synchronism"]
    C --> D["J5"]
    D --> E["N"]
    D --> F["L"]
    subgraph J1
        G0["G0"] & G1["B1"] & GND["GND"] & B2["B2"] & B8["B8"] & D5["D5"] & D3["D3"] & D1["D1"]
        G0 --> GND
        GND --> Y1["Y1"] & GND
        Y1 --> GND
        GND --> D4["D4"] & D2["D2"]
    end
    subgraph J5
        B9["B9"] & GND["GND"] & B10["B10"] & VZC["VZC"] & GND["VND"]
        B9 --> VDC["VDC"]
    end

Fig. 5.a

WARNINGS

• when programming the parameters with the key, the controller must be disconnected from the power supply and any other devices;
• the 24 Vdc available at the Vdc terminal can be used to supply an 4 to 20mA active probe; the maximum current is 100mA . The 5 Vdc available at the 5VR terminals can be used to supply to the 0 to 5V active ratiometric probes; the maximum total current is 50mA ;
• for applications subject to strong vibrations (1.5 mm pk-pk 10/55 Hz), secure the cables connected to the chiller ^3 using clamps placed around 3 cm from the connectors;
• for operation in domestic environments, shielded cables must be used (one wire + shield) for the tLAN connections (EN 55014-1);
• if a single power transformer is used for the chiller ^3 and the options, to avoid damaging the controller, all the G0 pins on the various controllers or the boards must be connected to the same terminal on the secondary, and all the G pins to the other terminal on the secondary, resetting the polarity of G and G0 for all the terminals;
• the system made up of the control board and the other optional boards represents a control device to be incorporated into class I or class II appliances.

Example of connection, as proposed by the default configuration.

graph TD
    subgraph PCO_100CLKD
        A["PCO 100CLKD"] --> B["PCO 100CLKD"]
        B --> C["PCO 100CLKD"]
        C --> D["PCO 100CLKD"]
        D --> E["PCO 100CLKD"]
        E --> F["PCO 100CLKD"]
        F --> G["PCO 100CLKD"]
        G --> H["PCO 100CLKD"]
        H --> I["PCO 100CLKD"]
        I --> J["PCO 100CLKD"]
        J --> K["PCO 100CLKD"]
        K --> L["PCO 100CLKD"]
        L --> M["PCO 100CLKD"]
        M --> N["PCO 100CLKD"]
        N --> O["PCO 100CLKD"]
        O --> P["PCO 100CLKD"]
        P --> Q["PCO 100CLKD"]
        Q --> R["PCO 100CLKD"]
        R --> S["PCO 100CLKD"]
        S --> T["PCO 100CLKD"]
        T --> U["PCO 100CLKD"]
        U --> V["PCO 100CLKD"]
        V --> W["PCO 100CLKD"]
        W --> X["PCO 100CLKD"]
        X --> Y["PCO 100CLKD"]
        Y --> Z["PCO 100CLKD"]
        Z --> AA["PCO 100CLKD"]
        AA --> AB["PCO 100CLKD"]
        AB --> AC["PCO 100CLKD"]
        AC --> AD["PCO 100CLKD"]
        AD --> AE["PCO 100CLKD"]
        AE --> AF["PCO 100CLKD"]
        AF --> AG["PCO 100CLKD"]
        AG --> AH["PCO 100CLKD"]
        AH --> AI["PCO 100CLKD"]
        AI --> AJ["PCO 100CLKD"]
        AJ --> AK["PCO 100CLKD"]
        AK --> AL["PCO 100CLKD"]
        AL --> AM["PCO 100CLKD"]
        AM --> AN["PCO 100CLKD"]
        AN --> AO["PCO 100CLKD"]
        AO --> AP["PCO 100CLKD"]
        AP --> AQ["PCO 100CLKD"]
        AQ --> AR["PCO 100CLKD"]
        AR --> AS["PCO 100CLKD"]
        AS --> AT["PCO 100CLKD"]
        AT --> AU["PCO 100CLKD"]
        AU --> AV["PCO 100CLKD"]
        AV --> AW["PCO 100CLKD"]
        AW --> AX["PCO 100CLKD"]
        AX --> AY["PCO 100CLKD"]
        AY --> AZ["PCO 100CLKD"]
        AZ --> BA["PCO 100CLKD"]
        BA --> BB["PCO 100CLKD"]
        BB --> BC["PCO 100CLKD"]
        BC --> BD["PCO 100CLKD"]
        BD --> BE["PCO 100CLKD"]
        BE --> BF["PCO 100CLKD"]
        BF --> BG["PCO 100CLKD"]
        BG --> BH["PCO 100CLKD"]
        BH --> BI["PCO 100CLKD"]
        BI --> BJ["PCO 100CLKD"]
        BJ --> BK["PCO 100CLKD"]
        BK --> BL["PCO 100CLKD"]
        BL --> BM["PCO 100CLKD"]
        BM --> BN["PCO 100CLKD"]
        BN --> BO["PCO 100CLKD"]
        BO --> BP["PCO 100CLKD"]
        BP --> BQ["PCO 100CLKD"]
        BQ --> BR["PCO 100CLKD"]
        BR --> BS["PCO 100CLKD"]
        BS --> BT["PCO 100CLKD"]
        BT --> BU["PCO 100CLKD"]
        BU --> BV["PCO 100CLKD"]
        BV --> BW["PCO 100CLKD"]
        BW --> BX["PCO 100CLKD"]
        BX --> BY["PCO 100CLKD"]
        BY --> BZ["PCO 100CLKD"]
        BZ --> CA["PCO 100CLKD"]
        CA --> CB["PCO 100CLKD"]
        CB --> CC["PCO 100CLKD"]
        CC --> CD["PCO 100CLKD"]
        CD --> CE["PCO 100CLKD"]
        CE --> CF["PCO 100CLKD"]
        CF --> CG["PCO 100CLKD"]
        CG --> CH["MCH33KKYAO: parameters programming key"]
        CH --> CI["MCH33KKYAO: parameters programming key"]
    end

    subgraph PCO_14
        CJ["MCH33KKYAO: parameters programming key"] --> CK["CNCLN+"]
    end

    subgraph PCO_24
        CR["MCH33KKYAO: parameters programming key"] --> CS["CNCLN+"]
    end

    subgraph PCO_34
        CT["MCH33KKYAO: parameters programming key"] --> CU["CNCLN+"]
    end

    subgraph PCO_44
        DV["MCH33KKYAO: parameters programming key"] --> DW["CNCLN+"]
    end

    subgraph PCO_54
        DU["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_64
        DV2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_74
        DV2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_84
        DV2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_94
        DV2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_16
        DV2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_24
        DV2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_34
        DV2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_44
        DV2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_54
        DV2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_64
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_74
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_84
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_94
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_16
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_24
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_34
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_44
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_54
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_64
        DV2M2M2M2M2M2M2["MCH33KKYAO: parameters programming key"] --> DW
    end

    subgraph PCO_74
        DV2M2M2M2M2M2M2["MCH33kYAO: parameters programming key"] --> DW
    end

    subgraph PCO_84
        DV2M2M2M2M2M2M2["MCH33kYAO: parameters programming key"] --> DW
    end

    subgraph PCO_94
        DV2M2M2M2M2M2M2["MCH33kYAO: parameters programming key"] --> DW
    end

    subgraph PCO_16
        DV2M2M2M2M2M2M2["MCH33kYAO: parameters programming key"] --> DW
    end

    subgraph PCO_24
        DV2M2M2M2M2M2M2["MCH33kYAO: parameters programming key"] --> DW
    end

    subgraph PCO_34
        DV2M2M2M2M2M2M2["MCH33kYAO: parameters programming key"] --> DW
    end

    subgraph PCO_44
        DV2M2M2M2M2M2M2["MCH33kYAO: parameters programming key"] --> DW
    end

    subgraph PCO_54
        DV2M2M2M2M2M2M2["MCH33kYAO: parameters programming key"] --> DW
    end

    subgraph PCO_64
        DV2M2M2M2M2M2M2["MCH33kYAO: parameters programming key"] --> DW
    end

    subgraph PCO_74
        DV2M2M2M2M2mUMBZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZLWZZ LRR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR_RR-RR_RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-RR-LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_LLR_TLR_LLR_TLR_LLR_TLR_LLR_TLR_LLR_TLR_LLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_TLR_HA Flow pump_circ.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc.1 low Pressure_dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (sw Congd.) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. (SW) dcc. DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DFF DPP EWRER CONC Cond. csc cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond Cond CondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondCondConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConcConCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCmCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnCnC n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n/C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n C n-C o l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l | 

    subgraph PCOLCKDL
            CX["X"] --> CPOLCKDL
            CPU["X"] --> CPU.KX["X"] & CPU.LX["X"] & CPU.MX["X"] & CPU.MX.X["X"] & CPU.MX.DX["X"] & CPU.MX.RX["X"] & CPU.MX.DX.XX["X"] & CPU.MX.DX.YX["X"] & CPU.MX.DX.ZX["X"] & CPU.MX.DX.ZX.XX["X"] & CPU.MX.DX.ZX.YX["X"] & CPU.MX.DX.ZX.ZX["X"] & CPU.MX.DX.ZX.DX.ZX.YX["X"] & CPU.MX.DX.ZX.DX.ZX.ZX["Y"] & CPU.MX.DX.ZX.DX.ZX.ZX["Y"] & CPU.MX.DX.ZX.DX.ZX.ZX["Y"] & CPU.MX.DX.ZX.DX.ZX.ZX["Y"] & CPU.MX.DX.ZX.DX.ZX.ZX["Y"] & CPU.MX.DX.ZX.Dx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx Zx B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B x B y z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z z |

    subgraph PCOLCKDL
            JCP["JCP"] --> JCP.KX["JCP"] = JCP.KX.KP["JCP"] = JCP.KX.KT["JCP"] = JCP.KX.KT.KP["KP"] = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP["JCP,KT"] = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KS["JCP,KT"] = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX.KT.KP.KP = JCP.KX .KPI["JCP,KT"] = JCP .KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI KPI LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTR LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LITH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH LTH<nl>

Assembly for the version without the plastic case

The chiller ^3 should be installed on a 0.5 to 2 mm thick metal panel using the special spacers.

The electrical damage that occurs to electronic components is almost always due to electrostatic discharges caused by the operator. Consequently, suitable precautions must be taken when handling these components, in particular:

• before handling any electronic component or board, touch an earthed object (avoiding contact with a component is not sufficient, as a 10,000 V discharge, a voltage that can easily be reached by static electricity, creates an arc of around 1 cm);
• the materials must remain as long as possible inside their original packages. If necessary, remove the board from the packing and then place the product in antistatic packaging without touching the rear of the board;
  • always avoid using plastic, polystyrene or non-antistatic materials;
  • always avoid passing the board between operators (to avoid the phenomena of electrostatic induction and consequent discharges).
• special care must be taken when fitting the optional boards on the main board, so as to avoid causing irreparable damage to the boards. Consequently, it is recommended to first secure the connection cables to the optional boards (using the plug-in terminals), and then insert the boards in the corresponding slots and finally secure the connection cables using cable clamps.

DRIVER ADRESSING IN pLAN NETWORK

The addressing of the EVD400 driver units that can be connected to the pLAN network must be set as following:

ADDRESS 2 -- > Circuit 1 Chiller Driver or Circuit 1 Bidirectional Driver

ADDRESS 3 -- > Circuit 1 Heat Pump Driver

ADDRESS 4 -- > Circuit 2 Chiller Driver or Circuit 2 Bidirectional Driver

ADDRESS 5 -- > Circuit 2 Heat Pump Driver

The driver should be configured using the serial addressing tool EVD4_UI Address that can be downloaded from CAREL website http://ksa.carel.com/.

For further details on the use of the Driver and its configuration please refer to the manual code +030220225.pdf (EVD4 - User manual)

6. Description of the main functions

6.1 Control set point

Inputs used

• Outside air temperature [B7]
• External set point [B8]
• Select cooling/heating from digital input [B25]

Parameters used

• Active operating mode (chiller/heat pump) [main]
- Cooling set point [r4]
- Heating set point [r5]
- Enable analogue probe 8 - External set point [-/-]
• Minimum set point value from probe B8 (cooling) [r6]
• Maximum set point value from probe B8 (cooling) [r7]
• Minimum set point value from probe B8 (heating) [r8]
• Maximum set point value from probe B8 (heating) [r9]
- Enable control of the clock board [t6]
- Enable set point time bands [-t-]
- Cooling set point in band 1 [-t-]
- Heating set point in band 1 [-t-]
- Cooling set point in band 2 [-t-]
- Heating set point in band 2 [-t-]
- Cooling set point in band 3 [-t-]
- Heating set point in band 3 [-t-]
- Cooling set point in band 4 [-t-]
- Heating set point in band 4 [-t-]
- Enable set point compensation [r11]
- Enable analogue probe 7 for outside air temperature [-/-]
• Maximum compensation value [r12]
• Minimum outside temperature for compensation in cooling [r13]
• Maximum outside temperature for compensation in cooling [r14]
• Minimum outside temperature for compensation in heating [r15]
• Maximum outside temperature for compensation in heating [r16]

Outputs used

Setting the control set point from the screen

The control set point can be set from the screen on the user interface.

Two distinct values need to be set, respectively for cooling and heating operation, if the unit features operation in chiller or heat pump mode.

Setting the remote analogue input set point

When enabling control of input B8 for the management of the remote set point, the setting made on the screen can be replaced with a set point calculated based on the 4 to 20 mA signal at the input to the board.

The lower and upper limits must be set for calculating the remote set point in cooling and/or heating operation.

Based on the 4 to 20 mA input signal, linear conversion will be performed between the end values set.

Remote set point for analogue input B8

The limits for calculating the remote set point will be the minimum and maximum values set for the corresponding password-protected parameter on set point screen.

MaxSTP Maximum remote set point limit

MinSTP Minimum remote set point limit

Fig. 6.a

Time bands for varying the set point

By enabling control of the clock board, the management of 4 daily set point time bands can be configured.

Each time band features the start and end time and the associated set point.

When the time band starts, the active set point is replaced by the value set for the active time band, irrespective of whether the analogue input for the remote set point is activated.

Set point compensation for outside air temperature

The working set point can be adjusted according to the outside air temperature.

Normally this function is used in installations where greater priority is given to comfort; for example, in a shop where people enter and exit frequently, an excessive temperature difference between the inside and outside may be annoying to users and negative to their health.

This function increases or decreases the unit set point according to the outside temperature measured, adding an offset to set point set as described above that is directly proportional to the difference between the minimum and maximum limits.

The parameters for setting the operating limits are different for cooling and heating operation, without any restrictions regarding the setting of the limits for calculating the compensation offset.

6.1.1 Minimum outside temperature limit

Inputs used

- Outside air temperature [B7]

Parameters used

• Enable analogue probe 7 Outside air temperature [-/-]
• Outside temperature set point limit [r17]
• Outside temperature differential limit [r18]

Outputs used

• Compressor 1 circuit 1 [B29]
  Winding A compressor 1
• Compressor 2 circuit 1 [B30]
  Winding B compressor 1
• Compressor 3 circuit 1 [B31]
• Compressor 1 circuit 2. Winding A compressor 2 [B34]
• Compressor 2 circuit 2. Winding B compressor 2 [B35]
• Compressor 3 circuit 2 [B36]

If the probe for measuring the outside air temperature is enabled, a temperature threshold is activated below which the compressors are forced off. Temperature control only starts again when the outside air temperature is above the set point + a differential.

On units in chiller operation, this is done to prevent the operation of the unit in ambient conditions that would cause an excessively low condensing pressure.

On units in heat pump operation, this is done to prevent the operation of the unit in ambient conditions that would cause the rapid formation of frost on the outdoor exchanger. To disable the function, simply set the value of the control differential to 0.

6.2 Inlet-room temperature control

Inputs used

• Room temperature (air/air units) [B5]
  Evaporator water inlet temperature

Parameters used

• Active operating mode (chiller/heat pump) [main]
- Configure type of unit [-H-]
• Total number of compressors / number of refrigerant circuits on unit [-H-]
- Enable compressor capacity control [-c-]
- Type of temperature control [-r-]
• Active set point [r1]
- Temperature control band [r10]
- Proportional or proportional + integral · Inlet control [-r-]
- Integral time for proportional + integral control [-r-]

Outputs used

• Liquid solenoid circuit 1 [B31]
• Liquid solenoid circuit 2 [B36]
• Compressor 1 circuit 1. Winding A compressor 1 [B29]
• Compressor 2 circuit 1. Compressor 1 capacity control. Winding B compressor 1 [B30]
• Compressor 3 circuit 1. Compressor 1 capacity control (if Part-Winding enabled) [B31]
• Compressor 1 circuit 2. Winding A compressor 2 [B34]
• Compressor 2 circuit 2. Compressor 2 capacity control [B35]
  Winding B compressor 2
• Compressor 3 circuit 2. Compressor 2 capacity control (if Part-Winding enabled) [B36]

7. Description of operation

Temperature control proportional to the reading of the evaporator inlet probe

graph TD
    A["STPM"] --> B["S1"]
    B --> C["S2"]
    C --> D["S3"]
    D --> E["S4"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#ccf,stroke:#333
    style D fill:#ccf,stroke:#333
    style E fill:#ccf,stroke:#333
    note right of A "RBM"
    note right of E "EIWT["°C"]"

Fig. 7.a

STPM Control set point

RBM Control band

EIWT Evaporator water inlet temperature

S 1...4 Control steps

The temperature control depends on the values measured by the temperature probe located at the evaporator inlet (air/water – water/water units), or by the room probe (air/air units), and follows proportional logic.

Depending on the total number of compressors configured and the number of load steps per compressor, the control band set will be divided into a number of steps of the same amplitude.

When the various thresholds are exceeded, a compressor or load step will be activated.

The following relationships are applied to determine of the activation thresholds:

Total number of control steps = Number of compressors + (Number of compressors * Number load steps/compressor).

Proportional step amplitude = Proportional control band / Total number of control steps

Step activation threshold = Control set point + (Proportional step amplitude * Progressive step [1,2,3,...]).

EXAMPLE OF TEMPERATURE CONTROL ON CHILLER UNITS WITH 4 COMPRESSORS

Semi-hermetic compressors with proportional control

C1 C2 C4C3 STPM EIWT [°C]RBM

Fig. 7.b

STPM Control set point

RBM Control band

EIWT Evaporator water inlet temperature

C 1...4 Compressor steps

7.1 Outlet temperature control

Inputs used

- Evaporator water outlet temperature [B6]

Parameters used

• Active operating mode (chiller/heat pump) [main]

- Configure type of unit [-H-]

• Total number of compressors / number of refrigerant circuits on unit [-H-]

- Enable compressor capacity control [-c-]

- Type of temperature control [-r-]

• Active set point [r1]

• Temperature control band [r10]

• Maximum time between starts with outlet control [-r-]

- Minimum time between starts with outlet control [-r-]

• Maximum time between stops with outlet control [-r-]

• Minimum time between stops with outlet control [-r-]

- Differential for calculating the time between steps with outlet control [-r-]

- Forced shutdown threshold with outlet control (cooling) [-r-]

- Forced shutdown threshold with outlet control (heating) [-r-]

Outputs used

• Liquid solenoid circuit 1 [B31]
• Liquid solenoid circuit 2 [B36]
• Compressor 1 circuit 1 Winding A compressor 1 [B29]
• Compressor 2 circuit 1 Compressor 1 capacity control Winding B compressor 1 [B30]
• Compressor 3 circuit 1 Compressor 1 capacity control (if Part-Winding enabled) [B31]
• Compressor 1 circuit 2 Winding A compressor 2 [B34]
• Compressor 2 circuit 2 Compressor 2 capacity control Winding B compressor 2 [B35]
• Compressor 3 circuit 2 Compressor 2 capacity control (if Part-Winding enabled) [B36]

EXAMPLE OF CONTROL IN THE DEAD ZONE ON CHILLER UNITS

Temperature control with dead zone based on the reading of the outlet probe

Fig. 7.c

STPM Control set point

RBM Control band

NZ Dead zone

TVD Time variation differential for activation/deactivation steps

EOWT Evaporator water outlet temperature

t Time

DonZ Device start zone

HTON Maximum time delay for activation of steps

LTON Minimum time delay for activation for steps

DoffZ Device stop zone

HTOFF Maximum time delay for deactivation of steps

LTOFF Minimum time delay for deactivation for steps

Temperature control is based on the temperature measured by probe B6 on units with one or two evaporators; in the latter the water temperature of mixture is used.

A temperature dead band is identified based on the set point and band.

Temperature values between the set point and set point + band (STPM < Temperature < STPM + RBM) will not switch any compressors On/Off.

Temperature values above set point + band (Temperature > STPM + RBM) will activate the compressors

Temperature values below the set point (Temperature < STPM) will deactivate the compressors

The compressor start/stop procedures are controlled by variable delay times.

With a differential set for calculating the delay time, the activation/deactivation of the devices is modulated according to the temperature measured.

Setting to 0 the minimum delay times upon an increase and/or decrease in the demand, disables the corresponding calculation functions.

A temperature threshold is envisaged, for both cooling operation and heating operation, below/above which the devices installed will in any case be stopped, in order to avoid excessive cooling/heating output produced by the unit.

7.2 Differential Temperature Control

Inputs used

• Evaporator inlet temperature

• Evaporator outlet temperature

• Outside air temperature

• Room temperature (acqua terminal)

Parameters used

- Type of unit

• Total number of compressors

• Number of load steps

• Type of temperature control

• Proportional band for inlet control or Dead zone for outlet control

• Temperature difference (delta) between reference and controlled value.

Outputs used

- Liquid solenoid

- Compressor start relay

- Compressor capacity control relay

Description of operation

The temperature control differential is based on the difference between a reference temperature and a controlled temperature.

calculated = Reference temperature - Controlled temperature

The value calculated in this way is compared against the rated value.

Depending on the unit operating mode, cooling or heating, the following situations may occur.

Cooling	Heating
calculated ≥ rated	---	Compressors On
calculated ≤ rated	Compressors On	---

The purpose of this function is to maintain a constant temperature difference between two components in a system, with different thermal inertia, by acting on only one of the values measured.

The controlled temperature is defined as the component with the lower thermal inertia.

The reference temperature is defined as the component with the higher thermal inertia.

As the unit can operate in cooling or heating mode as selected from the screen on the user interface or by the digital input, if the reference temperature equals or exceeds the controlled temperature (i.e. opposite to the unit operating mode), the operation of the controller switches from error correction to amplification; consequently, the application of this type of control is designed for systems in which the variation in controlled values occurs within certain limits dictated by the operating mode of the active unit.

Control is proportional, according to the control band set.

The proportional control band is divided into a number of uniform steps, equal to the total number of compressors and load steps installed (as for inlet temperature control). The control set point is the rated temperature difference set.

The value controlled is the difference calculated between the reference temperature and the controlled temperature.

To select this type of control, a special parameter is provided that indicates which signal is used by the temperature control functions:

• Evaporator inlet-outlet control probe

- Reference temperature—Controlled temperature

7.3 Condensing unit control

Inputs used

• External control value (condensing units) [B8]
• Condensing unit digital control 1 [B12]
• Condensing unit digital control 2 [B13]
• Condensing unit digital control 3 [B14]
• Condensing unit digital control 4 [B28]

Parameters used

• Configure type of unit [-H-]
• Type of condensing unit control [-H-]
• Select proportional or step condensing unit control [-H-]

Outputs used

- Compressor 1 circuit 1. Winding A compressor 1 [B29]

- Compressor 2 circuit 1. Compressor 1 capacity control. [B30]

Winding B compressor 1

• Compressor 3 circuit 1. Liquid solenoid circuit 1. Compressor 1 capacity control (if Part-Winding enabled) [B31]
• Compressor 1 circuit 2. Winding A compressor 2 [B34]
• Compressor 2 circuit 2. Compressor 2 capacity control [B35] Winding B compressor 2
• Compressor 3 circuit 2. Liquid solenoid circuit 2 Compressor 2 capacity control (if Part-Winding enabled) [B36]

Description of operation

Condensing unit control involves the devices being called by a proportional voltage or current signal supplied by an external controller, or alternatively a series of electromechanical contacts via digital input. As the compressors are called by an external controller, the corresponding control probes and parameters are not used.

Control with analogue input

The signal acquired by analogue input B8 is 4 to 20mA.

There are two control modes: proportional or steps, these can be selected via the dedicated user parameter.

Proportional control

Below is a description of the operation of proportional control when a 4 to 20 mA analogue input is used.

The compressor requests depend on the analogue input B8, with continuous variation of the input signal, the board calculates the number of steps required based on the value of the signal:

Analogue input 4mA 0% request (no compressor on)

Analogue input 20mA 100% request (all the compressors on)

EXAMPLE OF CONTROL ON A UNIT WITH 6 HERMETIC COMPRESSORS:

Condensing units with proportional control

Fig. 7.d

FSC Analogue input end scale

THR S1...5 Activation threshold for step 1 to 5

RC Remote control signal

C 1...6 Compressor steps

Total number of compressors = 6

Number of load steps per compressor = 0

Total number of steps = Total number of compressors + ( Total number of compressors * Number of load steps per compressor ) = 6 + 6 * 0 = 6 Amplitude of each step = Operating current range / Total number of steps = ( 20 - 4 ) / 6 = 2.666 mA

If the analogue input B8 measures 9.35 mA, two steps will be requested, therefore two compressors will be activated.

Two safety thresholds are calculated for the total activation or deactivation of the compressors, if exceeded.

These thresholds are calculated according to the following relationships.

Forced shutdown threshold = (Amplitude of each step / 2) + Analogue input lower end scale = (2.666 / 2) + 4 = 1.333 mA → 5.3 mA

Forced start threshold = Analogue input upper end scale - Forced shutdown threshold = 20 - 1.333 = 18.667 mA → 18.6 mA

If the reading of the analogue input B8 is less than the value of the forced shutdown threshold calculated, the devices will be stopped unconditionally.

If the reading of the analogue input B8 is greater than the value of the forced start threshold calculated, the devices will be started unconditionally.

Stepped control

Below is a description of the operation of stepped control steps when a 4 to 20 mA analogue input is used.

The compressor requests depend on the analogue input B8, using a current divider or equivalent circuit to supply precise signals that correspond to the activation or deactivation of the compressors and the relative load steps.

Analogue input 4 mA 100% request (all compressors on)

Analogue input 20 mA 0% request (no compressor on)

EXAMPLE OF CONTROL ON A UNIT WITH 6 HERMETIC COMPRESSORS:

Condensing units with stepped control

C5 C6 C4 C3 C1C2 THRS1THRS5 THRS4 THRS3 THRS20 RC [V/mA] FSC

Fig. 7.e

FSC Analogue input end scale

THR S1...5 Activation threshold for step 1 to 5

RC Remote control signal

C 1...6 Compressor steps

Total number of compressors = 6

Number of load steps per compressor = 0

Total number of steps = Total number of compressors + ( Total number of compressors * Number of load steps per compressor ) = 6 + 6 * 0 = 6

Amplitude of each step = Operating current range / Total number of steps = (20 - 4) / 6 = 2.666 mA.

If analogue input B8 measures 14.65 mA, two steps will be required, and consequently two compressors will be started.

Control with digital inputs

A number of digital inputs equal to the number of compressors installed on the unit are provided to start the devices.

There is no direct correspondence between the digital input and the compressor on, however the number of inputs closed at the same time will determine the number of compressors that are on. The compressor activation sequence is in any case defined according to rotation, as enabled by the corresponding parameter.

Only in the case of units with six compressors in two refrigerant circuits, in trio configuration, is there an exception to the compressor control mode; digital inputs 4 and 18 activate two load steps in response to just one input signal.

Considering this characteristic, the cooling capacity of the unit can still be modulated by uniformly increasing the capacity one step at a time; the digital inputs must be switched in such a way as to ensure that the difference in the number of requests between two consecutive input control sequences is equal to one step.

7.4 Compressor rotation

Inputs used

Compressor 1 thermal overload circuit 1	[B17]
Compressor 2 thermal overload circuit 1	[B18]
Compressor 3 thermal overload circuit 1 (units with trio compressors)	[B26]
Compressor 1 thermal overload circuit 2	[B22]
Compressor 2 thermal overload circuit 2	[B23]
Compressor 3 thermal overload circuit 2 (units with trio compressors)	[B27]

Parameters used

Configure type of unit	[-H-]
Type of semi-hermetic compressors controlled	[-c-]
Total number of compressors / number of refrigerant circuits on unit	[-H-]
Enable compressor capacity control	[-c-]
Select type of compressor / refrigerant circuit rotation	[-H-]
Enable operation of compressor 1 circuit 1	[-c-]
Enable operation of compressor 2 circuit 1	[-c-]
Enable operation of compressor 3 circuit 1	[-c-]
Enable operation of compressor 1 circuit 2	[-c-]
Enable operation of compressor 2 circuit 2	[-c-]
Enable operation of compressor 3 circuit 2	[-c-]
Manually force compressor 1 circuit 1	[-c-]
Manually force compressor 2 circuit 1	[-c-]
Manually force compressor 3 circuit 1	[-c-]
Manually force compressor 1 circuit 2	[-c-]
Manually force compressor 2 circuit 2	[-c-]
Manually force compressor 3 circuit 2	[-c-]

Outputs used

Liquid solenoid circuit 1	[B31]
Liquid solenoid circuit 2	[B36]
Compressor 1 circuit 1	[B29]
Winding A compressor 1
Compressor 2 circuit 1. Compressor 1 capacity control	[B30]
Winding B compressor 1

• Compressor 3 circuit 1 [B31]
  Compressor 1 capacity control (if Part-Winding enabled)
• Compressor 1 circuit 2. Winding A compressor 2 [B34]
• Compressor 2 circuit 2. Compressor 2 capacity control Winding B compressor 2 [B35]
• Compressor 3 circuit 2 [B36]
  Compressor 2 capacity control (if Part-Winding enabled)

The compressor calls are rotated so as to balance out the number of operating hours and starts of the devices.

There are three different types of rotation available:

• L.I.F.O.

• F.I.F.O.

- By time

- L.I.F.O. - F.I.F.O. - By time

Rotation is only performed between the compressors, and not between the capacity steps.

LIFO rotation

The first compressor to start will be the last to stop. The device activation sequence on a unit with 4 compressors is: C1, C2, C3, C4

The device deactivation sequence on a unit with 4 compressors is: C4, C3, C2, C1

FIFO rotation

The first compressor to start will be the first to stop. The device activation sequence on a unit with 4 compressors is: C1, C2, C3, C4.

The device deactivation sequence on a unit with 4 compressors is: C1, C2, C3, C4

Rotation by time

This type of rotation is based on the count of the device operating hours. The compressor with the least number of operating hours will always start first. The active compressor with the highest number of operating hours will always stop first.

The activation of one or more than one alarm that causes one or more compressors to shutdown requires the activation of an equivalent number of devices, from those available, so as to make up for the variation in active cooling capacity.

7.5 TANDEM - TRIO compressor rotation

Rotation between circuits

In the units with tandem or trio compressors in two refrigerant circuits, the circuit rotation described is incorporated into the rotation between compressors, for the purpose of balancing the quantity of oil in each.

Whenever the unit is started, and the compressors are completely off, rotation is performed that involves the alternating start-up of the two circuits.

Force tandem - trio compressors in FIFO rotation

For these types of compressors, the aim is to avoid the operation of circuits at part load for excessive periods (affecting the operation of the compressors that are off).

A maximum part load operating time has been introduced, after which the active compressor is stopped, and the demand is transferred to another compressor in the same circuit.

If no compressors are available when the exchange in condition occurs, the operation of the circuit remains unchanged.

The activation of an alarm on the compressor being forced on will involve a return to the previous operating conditions.

The count time for forcing the compressor on is reset whenever an alarm occurs in the circuit.

7.6 Compressor safety times

Inputs used

• Compressor 1 thermal overload circuit 1 [B17]
• Compressor 2 thermal overload circuit 1 [B18]
• Compressor 3 thermal overload circuit 1 (units with trio compressors) [B26]
• Compressor 1 thermal overload circuit 2 [B22]
• Compressor 2 thermal overload circuit 2 [B23]
• Compressor 3 thermal overload circuit 2 (units with trio compressors) [B27]

Parameters used

• Minimum compressor on time [-c-]
• Minimum compressor off time [-c-]
• Minimum time between starts of different compressors [-c-]
• Minimum time between starts of the same compressor [-c-]

Outputs used

• Liquid solenoid circuit 1 [B31]
• Liquid solenoid circuit 2 [B36]
• Compressor 1 circuit 1. Winding A compressor 1 [B29]
• Compressor 2 circuit 1. Compressor 1 capacity control [B30] Winding B compressor 1
• Compressor 3 circuit 1. [B31]
  Compressor 1 capacity control (if Part-Winding enabled)
• Compressor 1 circuit 2. Winding A compressor 2 [B34]
• Compressor 2 circuit 2. Compressor 2 capacity control [B35]
  Winding B compressor 2
• Compressor 3 circuit 2. [B36]
  Compressor 2 capacity control (if Part-Winding enabled)

Minimum compressor on time

This defines a guaranteed minimum ON time for the compressors; once activated, the compressors will operate for this time, irrespective of the temperature control request status. Only the activation of a protector will cause the device to shutdown earlier.

CREQ Compressor request

CMP Compressor status

MONT Minimum compressor on time

t Time

Fig. 7.f

Minimum compressor off time

This defines the minimum guaranteed OFF time for the compressors, in response to any shutdown signal due to the temperature conditions or an alarm. Even if called to start, a compressor cannot be switched on before this time elapses.

CREQ Compressor request

CMP Compressor status

MOFFT Minimum compressor off time

t Time

Fig. 7.g

Minimum time between starts of different compressors

This defines the minimum guaranteed time between the starts of two different compressors; this prevents simultaneous starts of multiple devices

C1REQ Compressor 1 request

C2REQ Compressor 2 request

CMP1 Compressor 1 status

CMP2 Compressor 2 status

CMPST Minimum time between starts of different compressors

t Time

Fig. 7.h

Minimum time between starts of the same compressor

This defines the minimum guaranteed time between two successive starts of the same compressor.

Even if called to start, the compressor will not be able to switch on before this times elapses.

Setting this parameter suitably can limit the number of starts/hour according to the specific instructions of the manufacturer of the compressor.

CREQ Compressor request

CMP Compressor status

CST Minimum time between starts of the same compressor

t Time

CREQ CMP t[s] CST t[s]

Fig. 7.i

7.7 Pumpdown management

Inputs used

Low pressure switch circuit 1	[B15]
Low pressure switch circuit 2	[B20]
Evaporation pressure 1	[B1]
Evaporation pressure 2	[B2]
ON/OFF from digital input (air/air units and chillers)	[B13]

Parameters used

Type of semi-hermetic compressors controlled	[-c-]
Maximum pumpdown duration	[-c-]
Select end pumpdown mode	[-c-]
End pumpdown pressure from probe	[-c-]
Unit ON/OFF from panel	[main]
Unit ON/OFF from supervisor	[]

Outputs used

Liquid solenoid circuit 1	[B31]
Liquid solenoid circuit 2	[B36]
Winding A compressor 1	[B29]
Winding B compressor 1	[B30]
Winding A compressor 2	[B34]
Winding B compressor 2	[B35]

The pumpdown procedure is performed for the purpose of completely emptying the residual freon from the evaporator in a refrigerant circuit during shutdown.

The following conditions can cause a refrigerant circuit to shutdown:

Remote ON/OFF: unit shutdown from remote contact

ON/OFF from keypad: unit shutdown from display with specific procedure

ON/OFF from supervisor: unit shutdown on signal from supervisory system

Thermostat: circuit shutdown when temperature set point reached

The pumpdown procedure involves the operation of a certain circuit with the liquid solenoid valve de-energised (closed).

The pumpdown procedure ends when:

• the low pressure transducer is activated, according to the set end pumpdown threshold
  • the low pressure switch is activated
  • the maximum time limit is reached

During the pumpdown procedure, the low pressure alarm, both from transducer and from pressure switch, is disabled.

CMPR	Compressor	request
PDS	Pumpdown	status
LP	Low	pressure
CMPS	Compressor	status
LPSTOP End due to low pressure
TIMESTOP End on reaching maximum time t [s] Time

CMPR PDS LP CMPS t [s] t [s] t [s] t [s] LP STOP TIMESTOP

7.8 Main pump management

Inputs used

• Evaporator water flow switch [B12]
  • Evaporator pump 1 thermal overload [B14]
• Evaporator pump 2 thermal overload [B28]

Parameters used

• Number of evaporator pumps [-H-]
• Evaporator pump/main fan operating mode [-H-]
• Delay between start of pump/main fan and compressors [-c-]
• Delay for stopping the pump/main fan [-c-]
• ON time in burst operation [-H-]
• OFF time in burst operation [-H-]

Outputs used

• Evaporator pump 1 [B33]
• Evaporator pump 2 [B36]

The main circulating pump can be managed in four different operating modes:

• Always on: the pump is activated when the unit is started and remains active while the unit is operating; if there are two pumps, the devices will be rotated according to the specific settings
• On according to the status of the compressor: the pump is on according to the compressor call status; consequently, when the set point has been reached, the circulating pump and compressors, excepting in the case of safety times, are off
• Burst operation: normally the circulating pump is off, and is activated periodically for a set time; the unit temperature conditions are constantly monitored and the compressors are started if necessary; when the control set point is reached the pump is switched off
  • Always off: the main circulating pump is not managed, whatever the operating conditions of the unit

Two safety times are observed, respectively a compressor activation delay after the circulating pump starts, and pump shutdown delay after the compressors stop when having reached the control set point or the unit is shutdown.

7.9 Pump rotation

Inputs used

• Evaporator water flow switch [B12]
• Evaporator pump 1 thermal overload [B14]
• Evaporator pump 2 thermal overload [B28]

Parameters used

• Number of evaporator pumps [-H-]
- Select type of evaporator pump rotation [-H-]
- Operating hour threshold for the rotation of the evaporator pumps [-H-]

Outputs used

• Evaporator pump 1 [B33]
• Evaporator pump 2 [B36]

If there are two circulating pumps on the unit, the operation of these can be rotated in the following modes:

• Rotation at start: when the unit is started, the operation of the pumps is rotated, so as to balance the number of starts-stops of the devices
- Rotation by time: a rotation time is established (expressed in hours), which when reached the devices are rotated, so as to balance the number of operating hours of the devices.

Control of the second circulating pump in any case involves forced rotation in the event of an alarm event of one of the devices, to ensure maximum continuity of operation.

Pump thermal overload alarm

If a thermal overload alarm is activated on the active circulating pump, the pump is stopped and the devices are rotated.

A further activation of the thermal overload alarm on the active reserve pump causes the total shutdown of the unit due to no other pump being available on power-up, and a new rotation is forced.

Evaporator flow switch alarm

The activation of the evaporator flow switch alarm forces the rotation of the devices and the activation of the reserve pump; in this condition, the alarm signal delay time in steady operation is re-activated, after which, with the alarm active, the unit is switched off.

Evaporator flow switch alarm/intervention

The evaporator flow switch intervention generates the EVAPORATOR FLOW SWITCH ALARM respecting the following time:

• Evaporator flow switch alarm delay at start-up
• Evaporator flow switch alarm delay in steady operation

If there are 2 evaporator pumps, the intervention of the flow switch causes the startup of the backup pump. If after the "Evaporator flow switch alarm delay at start-up" the flow switch signal is still present, the EVAPORATOR FLOW SWITCH ALARM occurs and the unit is turned off.

The compressors, after the startup of the backup pump, remain still ON for a delay time in steady operation.

7.10 Electric heaters

Inputs used

• Room temperature (air/air units) Evaporator water inlet temperature [B5]
• Air outlet temperature (air/air units) Evaporator water outlet temperature [B6]
- Evaporator 1 water outlet temperature [B9]
- Evaporator 2 water outlet temperature [B10]
- Outside air temperature [B7]
- Boiler temperature [B1]

Parameters used

• Select number of evaporators [-H-]
• Type of temperature control [-r-]
• Enable analogue probe 7 Outside air temperature [-/-]
• Enable analogue probe 1 Boiler temperature [-/-]
• Configuration of analogue inputs 1 and 2 [-/-]
• Antifreeze heater set point [A3]
• Antifreeze heater differential [A4]
  • Support heater set point in cooling mode [A5]
  • Support heater differential in cooling mode [A6]
  • Support heater set point 1 in heating mode [A7]
  • Support heater differential 1 in heating mode [A8]
  • Support heater set point 2 in heating mode [A9]
  • Support heater differential 1 in heating mode [A10]
• Delay in activation of the support heater in heating mode [A11]
• Select probe for cooling support control in air/air units [-A-]
• Outside air set point to enable support heater [-A-]
• Outside air differential to enable support heater [-A-]
• Boiler temperature set point to enable support heater [-A-]
• Boiler temperature differential to enable support heater [-A-]
  • Active operating mode (chiller/heat pump) [main]

Outputs used

• Status of digital output 11. Heater 1 [B39]
• Status of digital output 12. Heater 2 [B40]

Antifreeze heater

To prevent the activation of the antifreeze protection one or more electric heaters are used, immersed in the flow of water at the evaporator and controlled based on by a set point and differential. The activation of the antifreeze heater causes the total shutdown of the compressors, or in any case disables the cooling devices, until the temperature returns above the heater set point + differential.

Support heater in cooling

To prevent the activation of the minimum room temperature limit protection in air/air units, an electric heater is activated, immersed in the main air flow, controlled based on a set point and differential.

The activation of the support heater in cooling causes the total shutdown of the compressors, or in any case disables the cooling devices, until the temperature returns above the heater set point + differential.

SUPPORT HEATERS IN HEATING

Heating support function on water/air – water/water units

In units operating in heating mode with reversal on the refrigerant circuit, electric heaters (used in cooling mode as evaporator antifreeze heaters) are used to support the heating function, if the operation of the unit cannot satisfy the thermal load of the installation. These heaters are controlled based on the unit temperature control probe (inlet or outlet, according to the setting made), while two separate set points and differentials are set for the activation of the devices. In the event of control based on the temperature measured at the evaporator outlet, in units with one and two evaporators, the heaters will be controlled based on the values measured by analogue input B6.

Heating support function on air/air units

In units operating in heating mode with reversal on the refrigerant circuit, electric heaters are used to support the heating function, if the operation of the unit cannot satisfy the thermal load of the installation.

The user can set whether the heater is activated based on the room temperature or the outlet temperature.

The support heaters are managed by setting an activation delay time, calculated from when the circulating pump starts, so as to give the unit time to reach steady operation. Enabling the control set point compensation function will also cause the compensation of the heater set point, according to the same temperature difference calculated.

Boiler function

If the reading of analogue input B1 is enabled and configured as the boiler temperature, the operation of the heaters can be managed based on the outside temperature conditions and the water temperature in the storage cylinder.

Once having set a control set point and differential for both readings, the support heaters will be activated based on the control temperature measured (inlet or outlet, according to the specific setting) in reference to specific set points and differentials, only if the outside temperature conditions and boiler conditions allow.

7.11 Selecting the operating mode

Inputs used

- Select cooling/heating from digital input [B25]

Parameters used

• Configure type of unit [-H-]
• Cooling/Heating from panel [main]
• Enable cooling/heating selection from digital input [H2]
• Enable cooling/heating selection from supervisor [H4]
• Select cooling/heating from supervisor
• Logic of the 4-way reversing valve [-H-]
• Force devices OFF for automatic reversal of the refrigerant circuit [-H-]

Outputs used

• 4-way valve for reversing the refrigerant circuit in circuit 1 [B41]
• 4-way valve for reversing the refrigerant circuit in circuit 2 [B42]

In general, if the unit configured features operation in both chiller mode (cooling) and heat pump mode (heating), the operating mode can be changed with the unit on or off, depending on the type of selection.

There are three different ways to change the operating mode:

Keypad: a parameter is set on the menu. The operating mode can only be changed if the unit is off and the circulating pump has stopped

Supervisor: this can be enabled, with a switching signal received from the supervisor serial network. The operating mode can only be changed if the unit is off and the circulating pump has stopped

Digital input: this can be enabled, with the switching of the enabled digital input, by an external controller. A delay must be set for switching the reversing valves in the refrigerant circuit, if equal to zero the mode is switched immediately, otherwise the unit is switched off according to the procedure shown in the figure

Switching Cooling-heating from digital input

SWDIN Status of the digital input for Cooling-heating selection

USTAT Unit operating status

4WAY Operating status of 4 way reversing valves

(possibly depending on the operating logic)

SWD Cooling-heating switching delay

t[s] Time

Fig. 7.m

The keypad and supervisor have equal priority in setting the operating mode, the most recent variation determines the actual status; if enabled, the digital input has absolute priority over the other two.

7.12 ON/OFF time bands

Inputs used

• System hours [main]
• System minutes [main]
• System day [main]
• System month [main]
• System year [main]

Parameters used

• Enable control of the clock board [t6]
• Hour setting [t1]
• Minutes setting [t2]
• Day setting [t3]
  • Month setting [t4]
  • Year setting [t5]
• Enable unit ON-OFF time bands [-t-]
• Enable set point time bands [-t-]
• Configure time band parameters – day [-t-]

Outputs used

ON-OFF time bands

If control of the clock board is enabled, and the board is fitted and operating, the program can control 4 different types of time band, with separate application on each day of the week.

The time bands set only take effect if the unit has been switched on from the button.

Band 1

Four values are set, respectively the start and end times for two periods, within which the unit is on.

OFF

ON

OFF

ON

OFF

Band 2

Two values are set, respectively the start and end time band, within which the unit is on.

OFF

ON

OFF

Band 3

The unit is forced ON without time limits

Band 4

The unit is forced OFF without time limits

Set point time bands

If control of the clock board is enabled, and the board is fitted and operating, the program can control 4 different types of time band with changes in the set point, applied on each day of the week.

A different cooling and heating set point must be set for each period (total of 8 parameters) plus the start and end times of the bands.

Setting the same start and end times is equivalent to disabling the function for that period of time.

7.13 Antifreeze control

Inputs used

Evaporator water outlet temperature	[B6]
Evaporator 1 water outlet temperature	[B9]
Evaporator 2 water outlet temperature	[B10]

Parameters used

Enable analogue probe 6. Evaporator water outlet temperature	[-/-]
Antifreeze alarm set point (chiller units)	[A1]
Antifreeze alarm differential (chiller units)	[A2]
Minimum antifreeze/low room temperature set point limit	[-A-]
Maximum antifreeze/low room temperature set point limit	[-A-]
Type of antifreeze alarm reset	[-A-]
Antifreeze alarm delay when starting (manual reset)	[-A-]
Device start mode in antifreeze with unit off	[A12]

Outputs used

• Generic alarm

[B38]

General information

The antifreeze function is based on the reading made by the temperature probes located on the evaporator outlet.

The function is different for units with one or two water circuits, with the antifreeze control based on the readings of the following inputs respectively:

• B6 single circuit units
• B9-B10 two circuit units

graph LR
    A["FA"] --> B["THRA_F"]
    B --> C["DIFF_AF"]
    C --> D["AFH"]
    D --> E["THR_AFH"]
    E --> F["DIFF_AFH"]
    F --> G["EOWT [°C"]]

Fig. 7.n

THRA F Antifreeze alarm set point

DIFF AF Antifreeze alarm differential

FA Antifreeze alarm

THR AFH Antifreeze heater set point

DIFF AFH Antifreeze heater differential

AFH Antifreeze heater

EOWT Evaporator water outlet temperature

Antifreeze alarm

See the antifreeze alarm in the chapter on the alarms.

+030220431 rel 1.7 03/06/2014 56

7.14 Condenser - evaporator control

Inputs used

• Condensing temperature 1 [B1]
• Condensing temperature 2 [B2]
• Outside air temperature [B7]
• Condensing pressure 1 [B3]
• Condensing pressure 2 [B4]

Parameters used

• Type of condenser control [-F-]
• Number of condensers installed [-F-]
• Type of condensing devices controlled [-F-]
• Total number of fans installed [-F-]
• Forcing time when starting the condenser (control by temperature) [-F-]
  • Maximum voltage threshold for Triac [-F-]
• Minimum voltage threshold for Triac [-F-]
• Amplitude impulse for phase control [-F-]
• Condenser control set point (cooling) [-F-]
• Condenser differential (cooling) [-F-]
• Evaporator set point (heating) [-F-]
• Evaporator differential (heating) [-F-]
• Fan operation differential at minimum speed [-F-]
  • Maximum fan speed with inverter [-F-]
• Minimum fan speed with inverter [-F-]
• Speed-up time with inverter [-F-]
• Enable high pressure prevent [-F-]

[-F-] [-F-]

- High pressure prevent set point(cooling) [-F-]

- High pressure prevent differential(cooling) [-F-]

- Low pressure prevent set point(heating) [-F-]

- Low pressure prevent differential(heating) [-F-]

- Condenser operating mode in the event of probe fault [-F-]

- End prevent delay [-F-]

- Start hour for low-noise operation [F1]

- Start minutes for low-noise operation [F2]

- End hour for low-noise operation [F3]

- End minutes for low-noise operation [F4]

- Low-noise set point in cooling [F5]

- Low-noise set point in heating [F6]

- Enable control of the clock board [t6]

• Active operating mode (chiller/heat pump) [main]

Outputs used

• Fan 1 circuit 1 [B32]
• Fan 2 circuit 1 [B31]
• Fan 2 circuit 1 (1 condenser) [B37]
• Fan 1 circuit 2 (2 condensers) [B37]
• Fan 2 circuit 2 [B36]
• Status of analogue output 1 Condenser fans circuit 1 [B43]
• Status of analogue output 2 [B44]
  Condenser fans circuit 2

Condenser-evaporator on/off linked to compressor operation

The operation of the fans will be slaved exclusively to the operation of the compressors:

Compressor off = fan off

Compressor on = fan on

No pressure or temperature transducers need to be installed

On/off condenser-evaporator operation linked to the pressure or temperature sensor reading

The operation of the fans will be slaved to the operation of the compressors and the value read by the pressure or temperature sensors, according to a set point and band, with proportional control.

In cooling operation, when the pressure/temperature is less than or equal to the set point, all the fans will be off; when the pressure/temperature rises to the set point + band, all the fans will be on.

In heating operation, when the pressure/temperature is greater than or equal to the set point, all the fans will be off; when the pressure/temperature falls to the set point - band, all the fans will be on.

The control band is divided into a uniform number of steps, equal to the number of fans installed for the circuit in question.

Single or separate condensers/evaporators can be chosen; with single coils, the fans will be controlled by the higher/lower pressure/temperature, with the second separate coil, each pressure sensor/temperature controls its own fan or group of fans.

Modulating condenser-evaporator operation linked to the pressure or temperature sensor reading

The fans will be controlled by a 0 to 10 V or PWM analogue output, in proportion to the request from the pressure / temperature sensors.

Single or separate condensers/evaporators can be chosen; with single coils, the fans will be controlled by the higher/lower pressure/temperature, with the second separate coil, each pressure sensor/temperature controls its own fan or group of fans.

Condenser fan control in chiller operation

Fig. 7.0 Condenser control devices and alarms

STPC Condenser control set point

RBC Condenser control band

OFFD Deactivation differential

HYST Deactivation hysteresis (0.5bar/1°C)

MINV Minimum fan speed threshold

MAXV Maximum fan speed threshold

CPT Condensing pressure / temperature

With reference to the previous graph:

o pressure/temperature values between STPC and STPC+RBC cause the modulation of the condenser fan speed with proportional control between the minimum and maximum voltage set
o pressure/temperature values between STPC and STPC-OFFD cause the operation of the condenser fans at the minimum speed set
o pressure/temperature values below STPC-OFFD cause the total shutdown of the fans and the analogue output signal is set to 0 Volt. A fixed hysteresis of 0.5 bar or 1.0°C is featured to prevent swings in the controlled value around the threshold STPC-OFFD from causing repeated starts and stops of the controlled devices.

In the activation phase with increasing pressure/temperature, as soon as the value exceeds the threshold STPC-OFFD, the fan is operated at maximum speed for a period equal to the set speed-up time.

If condenser control is based on the condenser temperature reading, when the liquid solenoid valve opens (refrigerant circuit activated), if the outside air temperature is above STPC-OFFD, the fan is operated at maximum speed for a period equal to the set speed-up time.

This function aims to prevent high pressure in the refrigerant circuit when starting the compressors, caused by an incorrect measurement of the condenser temperature due to the thermal inertia of the control probe.

Fig. 7.p Condenser control devices and alarms

STPC Evaporator control set point RBC Evaporator control band OFFD Deactivation differential HYST Deactivation hysteresis (0.5bar/1°C) MINV Minimum fan speed threshold MAXV Maximum fan speed threshold CPT Evaporation pressure / temperature

In heat pump operation, the previous observations concerning cooling operation are still valid; the function simply operates in the diametrically opposite manner, given the different unit operating mode.

7.15 Prevent function

This function can be enabled in the manufacturer branch, and prevents the circuits from being shutdown due to a high pressure alarm. When the compressors are on, once reaching the set threshold, the capacity of the compressor is controlled until the pressure returns below or above the set point by a set differential, in cooling or heating mode respectively.

When the compressors are off, once having reached the set threshold, the fans are started at maximum speed until the pressure returns to acceptable values for the operation of the unit.

In units with tandem or trio hermetic compressors, the prevent function stops one of the active compressors, performing a rotation so as to shutdown a different device each time.

The compressor shutdown procedure is repeated whenever the pressure/temperature exceeds the set prevent threshold, or alternatively waits a fixed time of 10 seconds with high/low pressure before repeating the shutdown. The procedure stops when reaching the minimum number of devices on per circuit. In units with capacity-controlled semi-hermetic compressors, the prevent function activates the load steps, with the aim of preventing the compressor from shutting down.

7.16 Low noise function

This function is used to reduce the noise generated by the unit, due to the condenser/evaporator fans, at specific times.

Once the start and end times have been defined for the Low Noise function, the unit control set point will be modified in such period by a set value.

A set point is defined for cooling operation and another for heating operation, applied according to the set time band, in relation to the operating mode that is active on the unit.

Setting the same start and end times disables the function.

7.17 Start with hot condenser

This function only applies to air/water units in cooling operation with condenser control based on the temperature of the coil.

When activating a refrigerant circuit, if the temperature measured at the condenser is above 20.0^ C (when starting, the condenser temperature corresponds to the outside air temperature), the condenser fans are forced on at the maximum speed for a time equal to the set forcing time when starting.

7.18 Defrost control in air/water - Air/air units

Inputs used

• Condensing temperature 1 [B1]
• Condensing temperature 2 [B2]
• Outside air temperature [B7]
• Condensing pressure 1 [B3]
• Condensing pressure 2 [B4]

Parameters used

• Select values for start and end defrost control [-d-]
• Type of defrost between circuits [-d-]
• Select end defrost mode [-d-]
• Start defrost threshold [d1]
  • End defrost threshold [d2]
• Defrost activation delay [-d-]
  • Maximum defrost duration [-d-]
• Minimum defrost duration [-d-]
• Delay between defrosts on same circuit [-d-]
• Delay between defrosts on different circuits [-d-]
• Forced compressor off time at start and end defrost [-d-]
• Delay in reversing refrigerant circuit for defrost [-d-]
• Enable sliding defrost function [d3]
  • Minimum start defrost set point allowed with sliding defrost function [d4]
  • Outside temperature threshold to start sliding defrost action [d5]
  • Outside temperature threshold for maximum sliding defrost action [d6]
• Enable manual defrost actuator [-d-]
• Manual defrost on circuit 1 [-d-]
• Manual defrost on circuit 2 [-d-]

Outputs used

• Compressor 1 circuit 1 [B29] Winding A compressor 1
• Compressor 2 circuit 1 [B30] Winding B compressor 1
• Compressor 3 circuit 1 [B31]
• Compressor 1 circuit 2 [B34] Winding A compressor 2
• Compressor 2 circuit 2 Winding B compressor 2 [B35]

- Compressor 3 circuit 2 [B36]

- 4-way reversing valve circuit 1 [B41]

- 4-way reversing valve circuit 2 [B42]

- Fan 1 circuit 1 [B32]

- Fan 2 circuit 1 [B31]

- Fan 2 circuit 1 (single condenser) [B37]

- Fan 1 circuit 2 (2 condensers) [B37]

- Fan 2 circuit 2 [B36]

- Analogue output 1 status Condenser fans circuit 1 [B43]

- Analogue output 2 status Condenser fans circuit 2 [B44]

7.19 Types of defrost

Simultaneous

Only one circuit needs a defrost request (temperature/pressure below the start defrost threshold) for all the circuits to be forced to defrost. The circuits which do not require defrosting (temperature/pressure above the end defrost threshold) stop and go to standby; as soon as all the circuits end their defrost cycle the compressors can start again in heat pump operation.

Separate

The circuits are defrosted separately by the circuits. The first circuit that requires defrosting starts the procedure, while the others wait for the end defrost (heat pump operation) before reversing the cycle and sequentially performing the defrost.

7.20 Defrosting a circuit with time / temperature control

DefrOffTHR End defrost threshold

DefrOnTHR Start defrost threshold

CPT Condensing pressure/temperature

☐t Duration of the pressure/temperature inside the defrost activation zone

DefrAct Defrost active

t Time

Fig. 7-1 Defrost control

7.20.1 Description of operation

If the temperature/pressure of a coil remains continuously below the start defrost threshold for the defrost delay time set, the circuit in question will start a defrost cycle:

• the compressor/compressors in the circuit stop for a set time
• the refrigerant circuit is reversed using the 4-way valve after a set delay
- the fan in question is switched off (if the pressure probes are present, the high condensing pressure prevention function will be active)

If the compressor off time at start and end defrost is set to 0, then the 4-way reversing valve is switched with the compressors on.

The circuit exits the defrost cycle if the temperature/pressure exceeds the end defrost threshold, or after a maximum time, if the defrost cycle exceeds the maximum set threshold time.

7.20.2 Start defrost threshold automatic (sliding defrost)

In the event of very low outside temperatures, the pressure or temperature of the evaporator (outdoor exchanger) may fall below the start defrost threshold, even when there is no actual frost on the heat exchanger. In this case, a procedure has been implemented for automatically calculating the start defrost threshold, based on the outside air temperature probe reading.

The purpose of this function is to avoid unneeded defrosts due to outside conditions that are nonetheless favourable for heat pump operation, despite the low air temperature.

The user can thus set, in addition to the start defrost set point, an even lower threshold can be set that corresponds to the minimum temperature or pressure value for performing the defrost, thus avoiding the unit stopping due to low pressure. Within this interval, the start defrost threshold varies depending on the outside temperature, compensated proportionally. In this case too, a start compensation threshold and a limit threshold (minimum allowed) are used to lower the start defrost threshold within acceptable values and according to a certain proportionality.

Fig. 7-2 Sliding defrost

CPT Condensing pressure/temperature T.Ext Outside temperature

DefrOnTHR Start defrost threshold

MinDOnTHR Minimum start defrost threshold

MinSDOnTHR Sliding Defrost start threshold

MaxSDOffTHR Sliding Defrost limit threshold

7.20.3 Start and end defrost mode

Two distinct start and end defrost modes can be defined by suitably combining the settings of two parameters.

In particular, the values that determine the start and end defrost can be selected:

o Start-end by temperature: condenser temperature probe readings
o Start-end by pressure: condensing pressure probe readings
Start by pressure – end by temperature: condenser temperature probe reading for start defrost and fan control throughout the defrost phase, condenser temperature probe reading to end the procedure

The end defrost can also be selected as follows:

o Time : the defrost only ends when reaching the maximum time
o Pressure/temperature : the defrost ends when reaching the set end defrost thresholds, or alternatively after the maximum time

7.20.4 Dripping

The coil dripping phase is the period in which, with the refrigerant circuit in heating mode and the compressors off, the heat of the accumulated on the exchanger is exploited to remove any condensate.

This phase occurs at the end of the defrost cycle, from when the compressors stop to when the 4-way reversing valve switches to heat pump mode.

7.21 Defrosting a circuit with control from external contact

The activation / deactivation of the defrost cycle depends on the status an external contact, controlled by a differential pressure switch or outside temperature thermostat for the circuit in question.

For this purpose, the analogue input used to measure the temperature of the condenser coil will be used as a digital input for reading of the status of the pressure switch.

A voltage-free contact is thus required, which, if open, starts the defrost procedure, vice-versa if closed.

For this type of procedure the duration is also monitored and compared against the maximum time set.

7.22 Manual defrost

A circuit can also be defrosted manually using of a specific parameter with manufacturer password protection.

Based on the type of defrost configured (simultaneous or separate), the circuits can be defrosted at the same time or separately.

The manual defrost follows the settings of the normal defrost, as described in the previous paragraphs.

7.23 Defrost control ON REVERSE-CYCLE water/water units

Inputs used

Condensing temperature 1	[B1]
Condensing temperature 2	[B2]
Outside air temperature	[B7]
Condensing pressure 1	[B3]
Condensing pressure 2	[B4]

Parameters used

Select values for start and end defrost control	[-d-]
Type of defrost between circuits	[-d-]
Select end defrost mode	[-d-]
Start defrost threshold	[d1]
End defrost threshold	[d2]
Defrost activation delay	[-d-]
Maximum defrost duration	[-d-]
Minimum defrost duration	[-d-]
Delay between defrosts on same circuit	[-d-]
Delay between defrosts on different circuits	[-d-]
Enable sliding defrost function	[d3]
Minimum start defrost set point allowed with sliding defrost function	[d4]
Outside temperature threshold to start sliding defrost action	[d5]
Outside temperature threshold for maximum sliding defrost action	[d6]
Enable manual defrost actuator	[-d-]
Manual defrost on circuit 1	[-d-]
Manual defrost on circuit 2	[-d-]

Outputs used

Defrost heater circuit 1	[B32]
Defrost heater circuit 2	[B37]

Operation

On reverse-cycle water/water units, the defrost is performed using electric heaters immersed in the flow of water in the cooling coil.

7.24 Activating a defrost cycle

A configuration parameter is available for setting the measurement used to control the activation of the defrost, temperature or pressure; the threshold below which the defrost procedure starts then needs to be set.

The temperature or pressure must remain below this threshold for a continuous time equal to set defrost activation delay before the procedure can start.

In the event of consecutive defrosts on the same refrigerant circuit, the times between defrosts on the same circuit and between different circuits are also monitored, the latter applied only in the event of separate defrosts.

7.25 Running a defrost

The defrost phase is performed by switching off the compressors and activating the defrost heaters with the circulating pump on. The duration of the defrost cycle is monitored from the activation of the heaters and compared against the minimum threshold set; irrespective of pressure or temperature values measured, the defrost cannot end before the set time.

7.26 Ending a defrost cycle

Two parameters are available for setting the type of measurement controlled and the end defrost mode.

Based on the selection, pressure or temperature, a threshold must be set above which the defrost procedure ends.

The end defrost can be selected by maximum time or maximum time and temperature/pressure; in the latter mode the duration of the defrost cycle is monitored and compared against the maximum value set, once the maximum time threshold is exceeded the defrost ends immediately.

8. Map of outputs

8.1 Air / air units

8.1.1 Cooling only
DIGITAL INPUTS

ID 1 Serious alarm

ID 2 Air flow switch

ID 3 Remote ON/OFF

ID 4 Main fan thermal overload

ID 5 Low pressure switch circuit 1

ID 6 High pressure switch circuit 1

ID 7 Compressor 1 thermal overload circuit 1

ID 8 Compressor 2 thermal overload circuit 1

ID 9 Condenser fan 1 thermal overload circuit 1

ID10 Low pressure switch circuit 2

ID11 High pressure switch circuit 2

ID12 Compressor 1 thermal overload circuit 2

ID13 Compressor 2 thermal overload circuit 2

ID14 Condenser fan 1 thermal overload circuit 2

ID15

ID16 Compressor 3 thermal overload circuit 1 / Condenser fan 2 thermal overload circuit 1

ID17 Compressor 3 thermal overload circuit 2 / Condenser fan 2 thermal overload circuit 2

ID18

ANALOGUE INPUTS

B1 Condensing temperature circuit 1/ Evaporation pressure circuit 1/ External water storage temperature
B2 Condensing temperature circuit 2 / Evaporation pressure circuit 2
B3 Condensing pressure circuit 1
B4 Condensing pressure circuit 2
B5	Room temperature
B6 Air outlet temp.
B7	Outside temperature
B8 Remote set point
B9
B10

DIGITAL OUTPUTS

NO1 Compressor 1 circuit 1 / Winding A compressor 1 circuit 1
NO2 Compressor 2 circuit 1 / Winding B compressor 1 circuit 1 / Part load compressor 1 circuit 1
NO3 Liquid solenoid circuit 1 / Compressor 3 circuit 1/ Part load compressor 1 circuit 1 / Condenser fan 2 circuit 1
NO 4 Condenser fan 1 circuit 1
NO 5 Circulating fan
NO 6 Compressor 1 circuit 2 / Winding A compressor 1 circuit 2
NO 7 Compressor 2 circuit 2 / Winding B compressor 1 circuit 2 / Compressor 1 capacity control circuit 2
NO 8 Liquid solenoid circuit 2 / Compressor 3 circuit 2/ Compressor 1 capacity control circuit 2 / Condenser fan 2 circuit 2
NO 9 Condenser fan 1 circuit 2 / Condenser fan 2 circuit 1
NO10 General alarm
NO11 Antifreeze heater circuit 1
NO12 Antifreeze heater circuit 2
NO13
NO14

ANALOGUE OUTPUTS

Y1 0 to 10 V condenser fan inverter circuit 1
Y2 0 to 10 V condenser fan inverter circuit 2
Y3 PWM condenser fan inverter circuit 1
Y4 PWM condenser fan inverter circuit 2
Y5
Y6

Important:
If using a single condenser, with 2 fans configured and 3 compressors configured, in the event of step control, the dedicated outputs will be number 4 and number 9.

8.1.2 Cooling + Heat pump

DIGITAL INPUTS

ID 1 Serious alarm

ID 2 Air flow switch

ID 3 Remote ON/OFF

ID 4 Main fan thermal overload

ID 5 Low pressure switch circuit 1

ID 6 High pressure switch circuit 1

ID 7 Compressor 1 thermal overload circuit 1

ID 8 Compressor 2 thermal overload circuit 1

ID 9 Condenser fan 1 thermal overload circuit 1

ID10 Low pressure switch circuit 2

ID11 High pressure switch circuit 2

ID12 Compressor 1 thermal overload circuit 2

ID13 Compressor 2 thermal overload circuit 2

ID14 Condenser fan 1 thermal overload circuit 2

ID15

ID16 Compressor 3 thermal overload circuit 1 / Condenser fan 2 thermal overload circuit 1

ID17 Compressor 3 thermal overload circuit 2 / Condenser fan 2 thermal overload circuit 2

ID18

ANALOGUE INPUTS

B1 Condensing temperature circuit 1/ Evaporation pressure circuit 1/ External water storage temperature
B2 Condensing temperature circuit 2 / Evaporation pressure circuit 2
B3 Condensing pressure circuit 1
B4 Condensing pressure circuit 2
B5	Room temperature
B6 Air outlet temp.
B7	Outside temperature
B8 Remote set point
B9
B10

DIGITAL OUTPUTS

NO1 Compressor 1 circuit 1 / Winding A compressor 1 circuit 1

NO2 Compressor 2 circuit 1 / Winding B compressor 1 circuit 1 / Part load compressor 1 circuit 1

NO3 Liquid solenoid circuit 1 / Compressor 3 circuit 1/ Part load compressor 1 circuit 1 (if PART-WINDING enabled) / condenser fan 2 circuit 1

NO 4 Condenser fan 1 circuit 1

NO 5 Circulating fan

NO 6 Compressor 1 circuit 2 / Winding A compressor 1 circuit 2

NO 7 Compressor 2 circuit 2 / Winding B compressor 1 circuit 2 / Compressor 1 capacity control circuit 2

NO 8 Liquid solenoid circuit 2 / Compressor 3 circuit 2/ Compressor 1 capacity control circuit 2 Condenser fan 2 circuit 2

NO 9 Condenser fan 1 circuit 2/ Condenser fan 2 circuit 1

NO10 General alarm

NO11 Antifreeze heater circuit 1

NO12 Antifreeze heater circuit 2/ Support heater in heating operation

NO13 4-way valve circuit 1

NO14 4-way valve circuit 2

ANALOGUE OUTPUTS

Y1 0 to 10 V condenser fan inverter circuit 1

Y2 0 to 10 V condenser fan inverter circuit 2

Y3 PWM condenser fan inverter circuit 1

Y4 PWM condenser fan inverter circuit 2

Y5

Y6

Important:

If using a single condenser, with 2 fans configured and 3 compressors configured, in the event of step control, the dedicated outputs will be number 4 and number 9.

8.2 Air / water units

8.2.1 Cooling only

DIGITAL INPUTS

ID 1 Serious alarm

ID 2 Evaporator flow switch

ID 3 Remote ON/OFF

ID 4 Main pump thermal overload

ID 5 Low pressure switch circuit 1

ID 6 High pressure switch circuit 1

ID 7 Compressor 1 thermal overload circuit 1

ID 8 Compressor 2 thermal overload circuit 1

ID 9 Condenser fan 1 thermal overload circuit 1

ID10 Low pressure switch circuit 2

ID11 High pressure switch circuit 2

ID12 Compressor 1 thermal overload circuit 2

ID13 Compressor 2 thermal overload circuit 2

ID14 Condenser fan 1 thermal overload circuit 2

ID15

ID16 Compressor 3 thermal overload circuit 1 / Condenser fan 2 thermal overload circuit 1

ID17 Compressor 3 thermal overload circuit 2 /Condenser fan 2 thermal overload circuit 2

ID18 Evaporator pump 2 thermal overload

ANALOGUE INPUTS

B1 Condensing temperature circuit 1/Evaporation pressure circuit 1/External water storage temperature
B2 Condensing temperature circuit 2 /Evaporation pressure circuit 2
B3 Condensing pressure circuit 1
B4 Condensing pressure circuit 2
B5 Evaporator water inlet temperature
B6 Water outlet temperature
B7	Outside temperature
B8 Remote set point
B9 Evaporator 1 water outlet temperature
B10 Evaporator 2 water outlet temperature

DIGITAL OUTPUTS

NO1 Compressor 1 circuit 1 / Winding A compressor 1 circuit 1

NO2 Compressor 2 circuit 1 / Winding B compressor 1 circuit 1 / Part load compressor 1 circuit 1

NO3 Liquid solenoid circuit 1 / Compressor 3 circuit 1/ Part load compressor 1 circuit 1 / Condenser fan 2 circuit 1

NO 4 Condenser fan 1 circuit 1

NO 5 Pump

NO 6 Compressor 1 circuit 2 / Winding A compressor 1 circuit 2

NO 7 Compressor 2 circuit 2 / Winding B compressor 1 circuit 2 / Compressor 1 capacity control circuit 2

NO 8 Liquid solenoid circuit 2 / Compressor 3 circuit 2/ Compressor 1 capacity control circuit 2 / Condenser fan 2 circuit 2

NO 9 Condenser fan 1 circuit 2/ Condenser fan 2 circuit 1

NO10 General alarm

NO11 Antifreeze heater circuit 1

NO12 Antifreeze heater circuit 2

NO13

NO14

ANALOGUE OUTPUTS

Y1 0 to 10 V condenser fan inverter circuit 1
Y2 0 to 10 V condenser fan inverter circuit 2
Y3 PWM condenser fan inverter circuit 1
Y4 PWM condenser fan inverter circuit 2
Y5	Pump 2
Y6

Important:
If using a single condenser, with 2 fans configured and 3 compressors configured, in the event of step control, the dedicated outputs will be number 4 and number 9.

DIGITAL INPUTS

ID 1 Serious alarm

ID 2 Evaporator flow switch

ID 3 Remote ON/OFF

ID 4 Main pump thermal overload

ID 5 Low pressure switch circuit 1

ID 6 High pressure switch circuit 1

ID 7 Compressor 1 thermal overload circuit 1

ID 8 Compressor 2 thermal overload circuit 1

ID 9 Condenser fan 1 thermal overload circuit 1

ID10 Low pressure switch circuit 2

ID11 High pressure switch circuit 2

ID12 Compressor 1 thermal overload circuit 2

ID13 Compressor 2 thermal overload circuit 2

ID14 Condenser fan 1 thermal overload circuit 2

ID15 Select cooling/heating

ID16 Compressor 3 thermal overload circuit 1 / Condenser fan 2 thermal overload circuit 1

ID17 Compressor 3 thermal overload circuit 2 /Condenser fan 2 thermal overload circuit 2

ID18 Evaporator pump 2 thermal overload

ANALOGUE INPUTS

B1 Condensing temperature circuit 1/Evaporation pressure circuit 1/External water storage temperature
B2 Condensing temperature circuit 2 /Evaporation pressure circuit 2
B3 Condensing pressure circuit 1
B4 Condensing pressure circuit 2
B5 Evaporator water inlet temperature
B6 Water outlet temperature
B7	Outside temperature
B8 Remote set point
B9 Evaporator 1 water outlet temperature
B10 Evaporator 2 water outlet temperature

DIGITAL OUTPUTS

NO1 Compressor 1 circuit 1 / Winding A compressor 1 circuit 1

NO2 Compressor 2 circuit 1 / Winding B compressor 1 circuit 1 / Part load compressor 1 circuit 1

NO3 Liquid solenoid circuit 1 / Compressor 3 circuit 1/ Part load compressor 1 circuit 1 condenser fan 2 circuit 1

NO 4 Condenser fan 1 circuit 1

NO 5 Pump

NO 6 Compressor 1 circuit 2 / Winding A compressor 1 circuit 2

NO 7 Compressor 2 circuit 2 / Winding B compressor 1 circuit 2 / Compressor 1 capacity control circuit 2

NO 8 Liquid solenoid circuit 2 / Compressor 3 circuit 2/ Compressor 1 capacity control circuit 2Condenser fan 2 circuit 2 / Pump 2

NO 9 Condenser fan 1 circuit 2 / Condenser fan 2 circuit 1

NO10 General alarm

NO11 Antifreeze heater circuit 1

NO12 Antifreeze heater circuit 2 / Support heater in heating operation

NO13 4-way valve circuit 1

NO14 4-way valve circuit 2

ANALOGUE OUTPUTS

Y1 0 to 10 V condenser fan inverter circuit 1
Y2 0 to 10 V condenser fan inverter circuit 2
Y3 PWM condenser fan inverter circuit 1
Y4 PWM condenser fan inverter circuit 2
Y5	Pump 2
Y6

Important:

If using a single condenser, with 2 fans configured and 3 compressors configured, in the event of step control, the dedicated outputs will be number 4 and number 9.

8.3 Water / water units

8.3.1 Cooling only

DIGITAL INPUTS

ID 1 Serious alarm

ID 2 Evaporator flow switch

ID 3 Remote ON/OFF

ID 4 Main pump thermal overload

ID 5 Low pressure switch circuit 1

ID 6 High pressure switch circuit 1

ID 7 Compressor 1 thermal overload circuit 1

ID 8 Compressor 2 thermal overload circuit 1

ID 9 Condenser pump thermal overload

ID10 Low pressure switch circuit 2

ID11 High pressure switch circuit 2

ID12 Compressor 1 thermal overload circuit 2

ID13 Compressor 2 thermal overload circuit 2

ID14 Condenser flow switch

ID15

ID16 Compressor 3 thermal overload circuit 1

ID17 Compressor 3 thermal overload circuit 2

ID18 Evaporator pump 2 thermal overload

ANALOGUE INPUTS

B1 Condensing temperature circuit 1/Evaporation pressure circuit 1
B2 Condensing temperature circuit 2 /Evaporation pressure circuit 2
B3 Condensing pressure circuit 1
B4 Condensing pressure circuit 2
B5 Evaporator water inlet temperature
B6 Water outlet temperature
B7	Outside temperature
B8 Remote set point
B9 Evaporator 1 water outlet temperature
B10 Evaporator 2 water outlet temperature

DIGITAL OUTPUTS

NO1 Compressor 1 circuit 1 / Winding A compressor 1 circuit 1
NO2 Compressor 2 circuit 1 / Winding B compressor 1 circuit 1 / Part load compressor 1 circuit 1
NO3 Liquid solenoid circuit 1 / Compressor 3 circuit 1/ Part load compressor 1 circuit 1
NO 4
NO 5 Pump
NO 6 Compressor 1 circuit 2 / Winding A compressor 1 circuit 2
NO 7 Compressor 2 circuit 2 / Winding B compressor 1 circuit 2 / Compressor 1 capacity control circuit 2
NO 8 Liquid solenoid circuit 2 / Compressor 3 circuit 2 / Compressor 1 capacity control circuit 2 / Pump 2
NO 9
NO10 General alarm
NO11 Antifreeze heater circuit 1
NO12 Antifreeze heater circuit 2
NO13
NO14 Condenser pump

ANALOGUE OUTPUTS

Y1
Y2
Y3
Y4
Y5	Pump 2
Y6

DIGITAL INPUTS

ID 1 Serious alarm

ID 2 Evaporator flow switch

ID 3 Remote ON/OFF

ID 4 Main pump thermal overload

ID 5 Low pressure switch circuit 1

ID 6 High pressure switch circuit 1

ID 7 Compressor 1 thermal overload circuit 1

ID 8 Compressor 2 thermal overload circuit 1

ID 9 Condenser pump thermal overload

ID10 Low pressure switch circuit 2

ID11 High pressure switch circuit 2

ID12 Compressor 1 thermal overload circuit 2

ID13 Compressor 2 thermal overload circuit 2

ID14 Condenser flow switch

ID15 Cooling/ heating selection

ID16 Compressor 3 thermal overload circuit 1

ID17 Compressor 3 thermal overload circuit 2

ID18 Evaporator pump 2 thermal overload

ANALOGUE INPUTS

B1 Condenser inlet temperature
B2	Condenser outlet temperature
B3 Condensing pressure circuit 1
B4 Condensing pressure circuit 2
B5 Evaporator water inlet temperature
B6 Water outlet temperature
B7	Outside temperature
B8 Remote set point
B9 Evaporator 1 water outlet temperature
B10 Evaporator 2 water outlet temperature

DIGITAL OUTPUTS

NO1 Compressor 1 circuit 1 /Winding A compressor 1 circuit 1
NO2 Compressor 2 circuit 1 / Winding B compressor 1 circuit 1 /Part load compressor 1 circuit 1
NO3 Liquid solenoid circuit 1 / Compressor 3 circuit 1Part load compressor 1 circuit 1
NO 4
NO 5 Pump
NO 6 Compressor 1 circuit 2 / Winding A compressor 1 circuit 2
NO 7 Compressor 2 circuit 2 / Winding B compressor 1 circuit 2 /Compressor 1 capacity control circuit 2
NO 8 Liquid solenoid circuit 2 / Compressor 3 circuit 2/Compressor 1 capacity control circuit 2 / Pump 2
NO 9
NO10 General alarm
NO11 Antifreeze heater circuit 1
NO12 Antifreeze heater circuit 2 / Support heater in heating operation
NO13 Reversing valve
NO14 Condenser pump

ANALOGUE OUTPUTS

Y1
Y2
Y3
Y4
Y5	Pump 2
Y6

DIGITAL INPUTS

ID 1 Serious alarm

ID 2 Evaporator flow switch

ID 3 Remote ON/OFF

ID 4 Main pump thermal overload

ID 5 Low pressure switch circuit 1

ID 6 High pressure switch circuit 1

ID 7 Compressor 1 thermal overload circuit 1

ID 8 Compressor 2 thermal overload circuit 1

ID 9 Condenser pump thermal overload

ID10 Low pressure switch circuit 2

ID11 High pressure switch circuit 2

ID12 Compressor 1 thermal overload circuit 2

ID13 Compressor 2 thermal overload circuit 2

ID14 Condenser flow switch

ID15 Cooling/ heating selection

ID16 Compressor 3 thermal overload circuit 1

ID17 Compressor 3 thermal overload circuit 2

ID18 Evaporator pump 2 thermal overload

ANALOGUE INPUTS

B1 Condensing temperature circuit 1/Evaporation pressure circuit 1
B2 Condensing temperature circuit 2 /Evaporation pressure circuit 2
B3 Condensing pressure circuit 1
B4 Condensing pressure circuit 2
B5 Evaporator water inlet temperature
B6 Water outlet temperature
B7	Outside temperature
B8 Remote set point
B9 Evaporator 1 water outlet temperature
B10 Evaporator 2 water outlet temperature

DIGITAL OUTPUTS

NO1 Compressor 1 circuit 1 / Winding A compressor 1 circuit 1
NO2 Compressor 2 circuit 1 / Winding B compressor 1 circuit 1 / Part load compressor 1 circuit 1
NO3 Liquid solenoid circuit 1 / Compressor 3 circuit 1 Part load compressor 1 circuit 1
NO 4 Defrost heater circuit 1
NO 5 Pump
NO 6 Compressor 1 circuit 2 / Winding A compressor 1 circuit 2
NO 7 Compressor 2 circuit 2 / Winding B compressor 1 circuit 2 / Compressor 1 capacity control circuit 2
NO 8 Liquid solenoid circuit 2 /Compressor 3 circuit 2/ Compressor 1 capacity control circuit 2 Pump 2
NO 9 Defrost heater circuit 2
NO10 General alarm
NO11 Antifreeze heater circuit 1
NO12 Antifreeze heater circuit 2 / Support heater in heating operation
NO13 Reversing valve
NO14 Condenser pump

ANALOGUE OUTPUTS

Y1
Y2
Y3
Y4
Y5	Pump 2
Y6

8.4 Air-cooled condensing units

8.4.1 Cooling only

DIGITAL INPUTS

ID 1	Serious alarm / Remote ON/OFF (with digital controls). Serious alarm (with analogue control)
ID 2 Compressor 1 control (with digital controls) Not used (with analogue control)
ID 3	Compressor 2 control (with digital controls) Remote ON/OFF (with analogue control)
ID 4 Compressor 3 control (with tandem circuits and with digital controls)Compressor 3 and 4 control (with trio circuits and with digital controls)Not used (with analogue control)
ID 5 Low pressure switch circuit 1
ID 6 High pressure switch circuit 1
ID 7 Compressor 1 thermal overload circuit 1
ID 8 Compressor 2 thermal overload circuit 1
ID 9 Condenser fan 1 thermal overload circuit 1
ID10 Low pressure switch circuit 2
ID11 High pressure switch circuit 2
ID12 Compressor 1 thermal overload circuit 2
ID13 Compressor 2 thermal overload circuit 2
ID14 Condenser fan 1 thermal overload circuit 2
ID15
ID16 Compressor 3 thermal overload circuit 1 / Condenser fan 2 thermal overload circuit 1
ID17 Compressor 3 thermal overload circuit 2 / Condenser fan 2 thermal overload circuit 2
ID18 Compressor 4 control (with tandem circuits and with digital controls)Compressor 5 and 6 control (with trio circuits and with digital controls)Not used (with analogue control)

ANALOGUE INPUTS

B1 Condensing temperature circuit 1/Evaporation pressure circuit 1
B2 Condensing temperature circuit 2 /Evaporation pressure circuit 2
B3 Condensing pressure circuit 1
B4 Condensing pressure circuit 2
B5
B6
B7	Outside temperature
B8 Remote set point
B9
B10

DIGITAL OUTPUTS

NO1 Compressor 1 circuit 1 / Winding A compressor 1 circuit 1
NO2 Compressor 2 circuit 1 / Winding B compressor 1 circuit 1 / Part load compressor 1 circuit 1
NO3 Liquid solenoid circuit 1 / Compressor 3 circuit 1/ Part load compressor 1 circuit 1 / Condenser fan 2 circuit 1
NO 4 Condenser fan 1 circuit 1
NO 5
NO 6 Compressor 1 circuit 2 / Winding A compressor 1 circuit 2
NO 7 Compressor 2 circuit 2 / Winding B compressor 1 circuit 2 / Compressor 1 capacity control circuit 2
NO 8 Liquid solenoid circuit 2 / Compressor 3 circuit 2/ Compressor 1 capacity control circuit 2 / Condenser fan 2 circuit 2
NO 9 Condenser fan 1 circuit 2 / Condenser fan 2 circuit 1
NO10	General alarm
NO11
NO12
NO13
NO14

ANALOGUE OUTPUTS

Y1 0 to 10 V condenser fan inverter circuit 1

Y2 0 to 10 V condenser fan inverter circuit 2

Y3 PWM condenser fan inverter circuit 1

Y4 PWM condenser fan inverter circuit 2

Y5

Y6

Important:
If using a single condenser, with 2 fans configured and 3 compressors configured, in the event of step control, the dedicated outputs will be number 4 and number 9.
+030220431 rel 1.7 03/06/2014 71

8.4.2 Cooling + Heat pump

DIGITAL INPUTS

ID 1	Serious alarm / Remote ON/OFF (with digital controls) Serious alarm (with analogue control)
ID 2 Compressor 1 control (with digital controls) Not used (with analogue control)
ID 3 Compressor 2 control (with digital controls) Remote ON/OFF (with analogue control)
ID 4 Compressor 3 control (with tandem circuits and with digital controls)Compressor 3 and 4 control (with trio circuits and with digital controls)Not used (with analogue control)
ID 5 Low pressure switch circuit 1
ID 6 High pressure switch circuit 1
ID 7 Compressor 1 thermal overload circuit 1
ID 8 Compressor 2 thermal overload circuit 1
ID 9 Condenser fan 1 thermal overload circuit 1
ID10 Low pressure switch circuit 2
ID11 High pressure switch circuit 2
ID12 Compressor 1 thermal overload circuit 2
ID13 Compressor 2 thermal overload circuit 2
ID14 Condenser fan 1 thermal overload circuit 2
ID15 Cooling / heating selection
ID16 Compressor 3 thermal overload circuit 1 / Condenser fan 2 thermal overload circuit 1
ID17 Compressor 3 thermal overload circuit 2 /Condenser fan 2 thermal overload circuit 2
ID18 Compressor 4 control (with tandem circuits and with digital controls)Compressor 5 and 6 control (with trio circuits and with digital controls)Not used (with analogue control)

ANALOGUE INPUTS

B1 Condensing temperature circuit 1/Evaporation pressure circuit 1
B2 Condensing temperature circuit 2 /Evaporation pressure circuit 2
B3 Condensing pressure circuit 1
B4 Condensing pressure circuit 2
B5
B6
B7	Outside temperature
B8 Remote set pointl
B9
B10

DIGITAL OUTPUTS

NO1 Compressor 1 circuit 1 / Winding A compressor 1 circuit 1
NO2 Compressor 2 circuit 1 / Winding B compressor 1 circuit 1 / Part load compressor 1 circuit 1
NO3 Liquid solenoid circuit 1 / Compressor 3 circuit 1 / Part load compressor 1 circuit 1 condenser fan 2 circuit 1
NO 4 Condenser fan 1 circuit 1
NO 5
NO 6 Compressor 1 circuit 2 / Winding A compressor 1 circuit 2
NO 7 Compressor 2 circuit 2 / Winding B compressor 1 circuit 2 / Compressor 1 capacity control circuit 2
NO 8 Liquid solenoid circuit 2 / Compressor 3 circuit 2 / Compressor 1 capacity control circuit 2 Condenser fan 2 circuit 2
NO 9 Condenser fan 1 circuit 2 / Condenser fan 2 circuit 1
NO10 General alarm
NO11
NO12
NO13 4-way valve circuit 1
NO14 4-way valve circuit 2

ANALOGUE OUTPUTS

Y1 0 to 10 V condenser fan inverter circuit 1
Y2 0 to 10 V condenser fan inverter circuit 2
Y3 PWM condenser fan inverter circuit 1
Y4 PWM condenser fan inverter circuit 2
Y5
Y6

Important:

If using a single condenser, with 2 fans configured and 3 compressors configured, in the event of step control, the dedicated outputs will be number 4 and number 9.

Note

Part Winding management has been added to all unit configurations, together with the management of semi hermetic compressors with a single unloader valve.

9. ALARMS

9.1 Table of alarms

The following table describes all the alarms managed by the unit, indicating the type of devices disabled for each.

Code: this is the alarm ID code, which is shown cyclically on the PLD display

Description: this is the description of the type of alarm activated, as shown in the alarm log on the PGDO display

Type: this indicates the source of the alarm

DIN = digital input

AIN = analogue input

SYS = system

DRV = electronic expansion valve driver

Reset: this indicates the type of reset featured for the alarm

A = automatic

M = manual

S = selectable

Code	Description	Type		Reset	Delay	Pump/ Fan	C compressors	Notes
A001 Antifreeze alarm 1 DIN M / X X			X
A002	Antifreeze alarm 2	AIN	S	/	X
A003 Evaporator pump thermal overload		DIN M /		X	^1	X	X^*1	^1 If alarm on all the pumps
A004	Condenser pump thermal overload	DIN	M	/	X	X	X
A005 Evaporator flow switch alarm		DIN M		Start Steady operation	X^*1	X	X^*1	^1 If alarm on all the pumps
A006 Condenser flow switch alarm		DIN M		Start Steady operation	X	X	X	Total unit shutdown due to serious alarm
A007	Main fan thermal overload	DIN	M	/
A008 Evaporator pump 2 thermal overload		DIN M /		X	^1	X	X^*1	^1 If alarm on all the pumps
A009 Low pressure circ.1 (Pressure switch)		DIN S		Start Steady operation	X
A010 Low pressure circ. 2 (Pressure switch)		DIN S		Start Steady operation	X
A011	High pressure circ.1 (Pressure switch)	DIN	S	/	X
A012	High pressure circ. 2 (Pressure switch)	DIN	S	/	X
A013	Compressor 1 thermal overload circuit 1	DIN	S	/	X
A014	Compressor 2 thermal overload circuit 1	DIN	S	/	X
A015	Compressor 3 thermal overload circuit 1	DIN	S	/	X
A016	Compressor 1 thermal overload circuit 2	DIN	S	/	X
A017	Compressor 2 thermal overload circuit 2	DIN	S	/	X
A018	Compressor 3 thermal overload circuit 2	DIN	S	/	X
A019	Fan 1 thermal overload circuit 1	DIN	S	/	X^*1		X	^1 If alarm on all the fans
A020	Fan 2 thermal overload circuit 1	DIN	S	/	X^*1		X	^1 If alarm on all the fans
A021	Fan 1 thermal overload circuit 2	DIN	S	/	X^*1		X	^1 If alarm on all the fans
A022	Fan 2 thermal overload circuit 2	DIN	S	/	X^*1		X	^1 If alarm on all the fans
A023	High pressure circ. 1 (Transducer)	AIN	M	/	X		X^*1	^1 If high pressure prevent disabled
A024	High pressure circ. 2 (Transducer)	AIN	M	/	X		X^*1	^1 If high pressure prevent disabled
A025	Probe B1 faulty or disconnected	AIN	M	60s	X^*1		X^*1	^1 Operating mode can be configured if used as condensing temperature
A026	Probe B2 faulty or disconnected	AIN	M	60s	X^*1		X^*1	^1 Operating mode can be configured if used as condensing temperature
A027	Probe B3 faulty or disconnected	AIN	M	60s			X^*1	^1 Operating mode can be configured
A028	Probe B4 faulty or disconnected	AIN	M	60s			X^*1	^1 Operating mode can be configured
A029	Probe B5 faulty or disconnected	AIN	M	60s	X	X	X
A030	Probe B6 faulty or disconnected	AIN	M	60s	X	X	X
A031	Probe B7 faulty or disconnected	AIN	M	60s	X^*1		X^*1
A032	Probe B8 faulty or disconnected	AIN	M	60s	X^*1		X^*1	^1 In condensing units if used as control input
A033	Probe B9 faulty or disconnected	AIN	M	60s
A034	Probe B10 faulty or disconnected	AIN	M	60s
A035	Fan/main pump operating hour threshold	SYS	M	/
A036	Compressor 1 operating hour threshold circuit 1	SYS	M	/
A037	Compressor 2 operating hour threshold circuit 1	SYS	M	/
A038	Compressor 3 operating hour threshold circuit 1	SYS	M	/
A039	Compressor 1 operating hour threshold circuit 2	SYS	M	/
A040	Compressor 2 operating hour threshold circuit 2	SYS	M	/
A041	Compressor 3 operating hour threshold circuit 2	SYS	M	/

μC3

A042	Main pump 2 operating hour threshold SYS M /
A043	Clock board broken or not connected SYS S 5m (approx.)							Disables all the functions relating to the system clock
A044	Low pressure circ. 1 (Transducer) AIN S			Start(*) Steady operation	X		X	(*)Different delays and thresholds for chiller-heat pump-defrost
A045	Low pressure circ. 2 (Transducer) AIN S			Start(*) Steady operation	X		X	(*)Different delays and thresholds for chiller-heat pump-defrost
A046	Low room temperature alarm AIN M
A047	Condenser pump operating hour threshold	SYS	M
A048	Serious alarm from digital input	DIN	M	/	X	X	X
A059	Test SMS on alarm sent successfully	SYS	M
A060	Driver 1 EEPROM error	DRV M /			X		X	Prevents the corresponding circuit from starting
A061	Driver 2 EEPROM error	DRV M /			X		X	Prevents the corresponding circuit from starting
A062	Driver 3 EEPROM error	DRV M /			X		X	Prevents the corresponding circuit from starting
A063	Driver 4 EEPROM error	DRV M /			X		X	Prevents the corresponding circuit from starting
A064	Driver 1 EEV motor error	DRV M 10s			X			Prevents the corresponding circuit from starting
A065	Driver 2 EEV motor error	DRV M 10s			X			Prevents the corresponding circuit from starting
A066	Driver 3 EEV motor error	DRV M 10s			X			Prevents the corresponding circuit from starting
A067	Driver 4 EEV motor error	DRV M 10s			X			Prevents the corresponding circuit from starting
A068	Driver 1 MOP timeout	DRV	M	Settable	X			Stops the corresponding circuit
A069	Driver 2 MOP timeout	DRV	M	Settable	X			Stops the corresponding circuit
A070	Driver 3 MOP timeout	DRV	M	Settable	X			Stops the corresponding circuit
A071	Driver 4 MOP timeout	DRV	M	Settable	X			Stops the corresponding circuit
A072	Driver 1 LOP timeout	DRV	M	Settable	X			Stops the corresponding circuit
A073	Driver 2 LOP timeout	DRV	M	Settable	X			Stops the corresponding circuit
A074	Driver 3 LOP timeout	DRV	M	Settable	X			Stops the corresponding circuit
A075	Driver 4 LOP timeout	DRV	M	Settable	X			Stops the corresponding circuit
A076	Driver 1 low superheat	DRV	M	Settable	X			Stops the corresponding circuit
A077	Driver 2 low superheat	DRV	M	Settable	X			Stops the corresponding circuit
A078	Driver 3 low superheat	DRV	M	Settable	X			Stops the corresponding circuit
A079	Driver 4 low superheat	DRV	M	Settable	X			Stops the corresponding circuit
A080	Driver 1 EEV not closed when power OFF	DRV M /			X			Prevents the corresponding circuit from starting
A081	Driver 2 EEV not closed when power OFF	DRV M /			X			Prevents the corresponding circuit from starting
A082	Driver 3 EEV not closed when power OFF	DRV M /			X			Prevents the corresponding circuit from starting
A083	Driver 4 EEV not closed when power OFF	DRV M /			X			Prevents the corresponding circuit from starting
A084	Driver 1 high superheat	DRV	M	Settable	X			Stops the corresponding circuit
A085	Driver 2 high superheat	DRV	M	Settable	X			Stops the corresponding circuit
A086	Driver 3 high superheat	DRV	M	Settable	X			Stops the corresponding circuit
A087	Driver 4 high superheat	DRV	M	Settable	X			Stops the corresponding circuit
A088	Driver 1 probe S1 fault	DRV	M	/	X			Stops the corresponding circuit
A089	Driver 2 probe S1 fault	DRV	M	/	X			Stops the corresponding circuit
A090	Driver 3 probe S1 fault	DRV	M	/	X			Stops the corresponding circuit
A091	Driver 4 probe S1 fault	DRV	M	/	X			Stops the corresponding circuit
A092	Driver 1 probe S2 fault	DRV	M	/	X			Stops the corresponding circuit
A093	Driver 2 probe S2 fault	DRV	M	/	X			Stops the corresponding circuit
A094	Driver 3 probe S2 fault	DRV	M	/	X			Stops the corresponding circuit
A095	Driver 4 probe S2 fault	DRV	M	/	X			Stops the corresponding circuit
A096	Driver 1 probe S3 fault	DRV	M	/	X			Stops the corresponding circuit
A097	Driver 2 probe S3 fault	DRV	M	/	X			Stops the corresponding circuit
A098	Driver 3 probe S3 fault	DRV	M	/	X			Stops the corresponding circuit
A099	Driver 4 probe S3 fault	DRV	M	/	X
A100	Driver 1 Go Ahead request	DRV	M /		X			Prevents the corresponding circuit from starting
A101	Driver 2 Go Ahead request	DRV	M /		X			Prevents the corresponding circuit from starting
A102	Driver 3 Go Ahead request	DRV	M /		X			Prevents the corresponding circuit from starting
A103	Driver 4 Go Ahead request	DRV	M /		X			Prevents the corresponding circuit from starting
A104	Driver 1 LAN disconnected	SYS	M	30s	X		X	Stops the corresponding circuit
A105	Driver 2 LAN disconnected	SYS	M	30s	X		X	Stops the corresponding circuit
A106	Driver 3 LAN disconnected	SYS	M	30s	X		X	Stops the corresponding circuit

μC3

A107 Driver 4 LAN disconnected SYS M 30s X X	Stops the corresponding circuit
A108 Driver 1 autosetup not completed SYS M /
A109 Driver 2 autosetup not completed SYS M /
A110 Driver 3 autosetup not completed SYS M /
A111 Driver 4 autosetup not completed SYS M /

9.2 Type of alarm reset

The reset mode can be set for some of the alarms listed in the table, choosing between automatic and manual:

o Compressor thermal overload
o Fan thermal overload
o Low pressure from transducer and/or pressure switch
o High pressure from transducer and/or pressure switch

If automatic reset is selected, a maximum number of events with automatic reset and maximum period of validity can be set, with the time counted from the activation of the first alarm.

If after this period the maximum number of repeats of a certain event is not reached, the timer is reset and the next alarm will start a new count.

If the maximum number N of repeats set is reached within the set time, then the next event (N+1) will be with manual reset, requiring the operator to intervene to restore the operation of the unit.

If manual reset is set, then each alarm event requires the intervention of the operator to restore the operation of the unit.

9.3 Alarm log

The alarm log is included to save the fundamental unit operating values in response to certain events.

9.4 Flow switch alarm

Inputs used

• Air flow switch (air/air units) [B12]
  Evaporator water flow switch

Parameters used

• Number of evaporator pumps [-H-]
- Evaporator flow switch alarm delay at start-up [P1]
• Evaporator flow switch alarm delay in steady operation [P2]

Outputs used

• Evaporator pump 1 [B33]
• Evaporator pump 2 [B36]
• Generic alarm [B38]

The evaporator flow switch alarm disables the operation of the unit if there is no water or air in the main exchanger, so as to prevent dangerous operating conditions with the compressors on and no water or air flow.

In Air/water or Water/water units, if control of the second circulating pump is enabled, as the flow switch alarm will cause the rotation of the pump in operation, the program will attempt to recover the situation by starting the reserve device.

The alarm management features two delay times before activation:

• when the water circuit is first started
• when the unit is in steady operation

The activation of the reserve pump to restore an alarm situation resets the delay in steady operation, after which any new alarm condition will cause the unit to shut down due to a serious water flow problem.

In general, with the reserve circulating pump enabled, the flow switch alarm can be activated two times in a row, after which the unit is switched off due to the alarm.

9.5 Circulating pump thermal overload alarm

Inputs used

• Evaporator pump 1 thermal overload [B14]
• Evaporator pump 2 thermal overload [B28]

Parameters used

- Number evaporator pumps [-H-]

Outputs used

• Evaporator pump 1 [B33]
• Evaporator pump 2 [B36]
• Generic alarm [B38]

The circulating pump thermal overload alarm disables the operation of the device, causing the unit to shutdown immediately, so as to prevent dangerous operating conditions with the compressors on and no water flow.

If control of the second circulating pump is enabled, as the thermal alarm will cause the rotation of the pump in operation, the program will attempt to recover the situation by starting the reserve device. Should there also be a thermal overload alarm on this device too, the unit will shutdown immediately.

In general, if in response to a thermal overload alarm a different pump cannot be started as support, the unit is switched off.

9.6 Condenser fan thermal overload alarm

Inputs used

• Condenser fan 1 thermal overload circuit 1 [B19]
• Condenser fan 2 thermal overload circuit 1 (1 condenser) [B24]
  • Condenser fan 2 thermal overload circuit 1 (2 condensers, 4 fans) [B26]
• Condenser fan 1 thermal overload circuit 2 (2 condensers) [B24]
• Condenser fan 2 thermal overload circuit 2 (2 condensers, 4 fans) [B27]

Parameters used

• Number of condensers installed [-F-]
- Total number of fans installed [-F-]

Outputs used

• Fan 1 circuit 1 [B32]
• Fan 2 circuit 1 [B31]
• Fan 2 circuit 1 (single condenser) [B37]
• Fan 1 circuit 2 (2 condensers) [B37]
• Fan 2 circuit 2 [B36]

The purpose of an individual thermal overload alarm is to prevent the operation of the corresponding device.

The alarm affects the operation of the refrigerant circuit in different ways.

In general, if in a certain refrigerant circuit, due to one or more alarms the condenser fans are no longer available, then the compressors are also switched off, thus stopping the circuit, so as to avoid dangerous situations of high pressure in the condenser.

9.7 Antifreeze alarm

The activation of the antifreeze alarm is based on a set point and differential; if the water temperature falls below the set point, the compressors are stopped immediately, while the pump remains on to prevent the formation of ice.

The devices can only be restarted if the water temperature rises above the alarm set point + differential.

The set point for the antifreeze alarm is limited by minimum and maximum values, protected by manufacturer password, so as to prevent the values being set at dangerous extreme unit operating conditions.

The alarm reset can be defined as manual or automatic:

Manual reset: the activation of the antifreeze protection is delayed by a set time (in minutes) from when the unit starts, to allow the unit time to move the water and reach steady operation; the alarm causes the devices to shutdown as described and requires the operator to reset the unit from the user terminal; the unit will only restart if the temperature has returned above the alarm set point + differential.

Automatic reset: the activation of the antifreeze protection causes the devices to shutdown as described, and does not require any action by the operator to reset the operation of the unit; as soon as the temperature rises above the alarm set point + differential, the unit will restart automatically.

A start-up configuration can be defined for the devices in the event of antifreeze alarms when the unit is off.

This function applies only to air/water and water/water units, with the following options:

DISABLED: the function is disabled, consequently no load switches in response to an antifreeze alarm

HEAT & PUMP ON: in response to an antifreeze alarm, the antifreeze heater and the circulating pump are started

HEAT & UNIT ON: in response to an antifreeze alarm, the antifreeze heater and the entire unit are started in heat pump mode, if operation in heating mode is featured

HEATER ONLY ON: in response to an antifreeze alarm, the antifreeze heater/heaters are started.

10. Connections, accessories and options

Dimensioni (mm) / Dimensions (mm)

μC³ 227.5 60 Fig. 1 111

μC3 in plastic case, complete (single package)	MCH3010020
μC3 without plastic case (multiple packs of 18 boards)	MCH3010001
μC3 connector kit (single package)	MCH3CON000
μC3 connector kit (multiple packs of 18 boards)	MCH3CON001
μC3 cable kit 2 m (single package)	MCH300CAB0
parameter programming key with external power supply	MCH300KYA0
clock board PCO100CLK0
optically-isolated RS485 serial board PCOS004850
RS232 serial board for modems PCO100MDM0
LON FTT10 STD serial board with LonMark chiller profile	PCO10001F0
120x32 semi-graphic terminal, panel installation	PGD0000F00

12. Technical specifications

Plastic case material technopolymer
flame retardancy	V0 (UL94) and 960°C (IEC 695)
ball pressure test	125°C
resistance to creeping current	≥250 V
colour	grey RAL7035
type of assembly	mounted on DIN rail, as per DIN 43880 and CEI EN 50022 standards

Electrical specifications

Power supply (controller with standard terminal connected): 22 to 38 Vdc or 24 Vac ±15% 50/60 Hz - Maximum power input P=14 W.
Analogue inputs

analogue conversion	10-bit A/D converter, built-in CPU
type	5 inputs: B5, B6, B7, B9 and B10; CAREL NTC temperature sensors (-50T90°C; R/T 10 kΩ 25°C)2 inputs: B3 and B4; sensors with 0 to 5 Vdc ratiometric signal1 input: B8; sensor with 4 to 20 mA current signal2 inputs: B1 and B2; NTC or 0 to 5 V, can be configured by software
maximum number	10
input time constant	1 s
internal resistance of 4 to 20 mA inputs	100 Ω

Analogue outputs

type and max. no.	4 x 0 to 10 Vdc outputs (Y1, Y2, Y5 and Y6);2 PWM phase control outputs (Y3 and Y4) with a 5 V impulse of programmable duration;
resolution 8 bit
maximum load	1 kΩ (10 mA) for 0 to 10 V and 470 Ω (10 mA) for PWM

Digital outputs

maximum number	14 (electromechanical relays)
N5 Signal relay 1: C5N6, N7, N8, N9 GROUP B:N10 Signal relay 2: C10	N1, N2, N3, N4	GROUP A: C1-2, C3-4
	C6-7, C8-9
	N11, N12, N13, N14	GROUP C: C11-12, C13-14
current limits max current 2	A for each relayoutput, extendable to 3A for a single output

Some outputs are grouped in twos, with two common terminals so as to ensure easy assembly of the common pins. Make sure that the current running through the common terminals does not exceed the rated current of each individual terminal, that is: 6 A for the Mini-fit terminals.

Type of relay	1250 VA, 250Vac, 5 A resistive
EN approval	EN60730: 3 A resistive, 2 A inductive, 3(2) A (100,000 cycles)
UL approval	UL: 3 A resistive, 1 A FLA, 6 A LRA, 250 Vac, =0.4 , C300 (30,000 cycles)

All the relays must have the common in the same group [C1-2, C3-4], [C6-7, C8-9], [C11-12, C13-C14] connected together externally.

Power

G(+), G0(-)	Power supply to μchiller3 + 24 Vdc/Vac
VDC	Power output for 24 Vdc active probes
5VR	Power output for 5 Vdc ratiometric probes
VZC	24 Vac zero crossing for the PWM phase control analogue outputs

The use of some inputs/outputs depends on the configuration of the parameters.

Other specifications

storage conditions	-20T70, 90 % RH non-condensing
operating conditions	-10T55, 90 % RH non-condensing
index of protection	IP20 or IP00 (version without plastic case)
environmental pollution	normal
class of protection against electric shock	to be integrated in Class I and/or II appliances
PTI of the insulating materials	250 V
period of stress across the insulating parts	long
type of action	1C
type of disconnection or microswitching	microswitching
category of resistance to heat and fire	category D (UL94 - V0)
immunity against voltage surges	category 1
no. of automatic operating cycles	100,000 (EN 60730-1); 30,000 (UL 873)
software class and structure	Class A

The device is not designed to be he-held.

WARNINGS

• when programming the parameters with the key, the controller must be disconnected from the power supply and any other devices;
• the 24 Vdc available at the Vdc terminal can be used to supply an 4 to 20mA active probe; the maximum current is 100mA . The 5 Vdc available at the 5VR terminals can be used to supply to the 0 to 5V active ratiometric probes; the maximum total current is 50mA ;
• for applications subject to strong vibrations (1.5 mm pk-pk 10/55 Hz), secure the cables connected to the chiller3 using clamps placed around 3 cm from the connectors;
• for operation in domestic environments, shielded cables must be used (one wire + shield) for the tLAN connections (EN 55014-1);
• If a single power transformer is used for the chiller3 and the options, to avoid damaging the controller, all the G0 pins on the various controllers or the boards must be connected to the same terminal on the secondary, and all the G pins to the other terminal on the secondary, resetting the polarity of G and G0 for all the terminals;
• the system made up of the control board and the other optional boards represents a control device to be incorporated into class I or class II appliances.

CAREL

CAREL HQs