EWYD460BZSS - Air-conditioner DAIKIN - Free user manual and instructions

USER MANUAL EWYD460BZSS DAIKIN

Software version ASDU01C and later

D-EOMCP00104-14EN

TABLE OF CONTENTS

1 CONTENTS 5

1.1. Installation Precautions....5
1.2. Temperature and Humidity considerations 5

2. GENERAL DESCRIPTION......6

3. MAIN CONTROL SOFTWARE FEATURES....7

4. SYSTEM ARCHITECTURE 8

4.1. Control Panel 9
4.2. Main board....11
4.3. pCO ^e Expansion....12
4.4. EEXV Valve Driver 14

4.4.1. Meaning of the Driver EEXV status leds 14

4.5. Addressing of pLan/RS485 15
4.6. Software....15
4.6.1. Version identification.... 16

5. PHYSICAL INPUTS AND OUTPUTS ...... 18

5.1. ASDU01C controller #1 - Base unit and compressors #1 & #2 control .... 18
5.2. ASDU01C controller #2 - Compressors #3 & #4 control....19
5.3. pCO ^e expansion #1 – Additional hardware....20

5.3.1. Expansion connected to ASDU01C #1 20
5.3.2. Expansion connected to ASDU01C #2 20

5.4. pCO ^c expansion #2 – Heat recovery or heat pump control 20

5.4.1. Heat recovery option 20
5.4.2. Heat pump option 21

5.5. pCO ^e expansion #3 – Water pump control....21
5.6. pCO ^e expansion #4 – Fan step control.... 22

5.6.1. Expansion connected to ASDU01C #1 22
5.6.2. Expansion connected to ASDU01C #2 22
5.6.3. EXV Driver 22

6. MAIN CONTROLLER FEATURES 23

6.1. Controller purpose....23
6.2. Unit enabling.... 23
6.3. Unit modes....23

6.4. Setpoints management....24

6.4.1. 4-20mA setpoint override....25
6.4.2. OAT setpoint override.... 26
6.4.3. Return setpoint override 26

6.5. Compressors capacity control 27

6.5.1. Automatic Control....27
6.5.2. Manual Control 30

6.6. Compressors timing....33
6.7. Compressors protection 33

6.8. Compressors startup procedure....33

6.8.1. Fan pre-starting in heating mode....34
6.8.2. Prepurge procedure with electronic expansion 34
6.8.3. Prepurge procedure with thermostatic expansion 34
6.8.4. Oil heating 34

6.9. Pumpdown....34

6.10. Low ambient temperature start 35

6.11. Compressors and unit trips.... 35

6.11.1. Unit trips....35
6.11.2. Compressors trip 36
6.11.3. Other trips.... 39
6.11.4. Unit and compressors alarms and corresponding codes 39

6.12. Economizer valve 40

6.13. Switch between cooling and heating mode 40

6.13.1. Switching from cooling modes to eating mode 40
6.13.2. Switching from heating modes to cooling modes 41
6.13.3. Additional consideration 41

6.14. Defrost procedure 41

6.15. Liquid injection 42

6.16. Heat Recovery procedure.... 42

6.16.1. Recovery pump 42
6.16.2. Recovery control 43

6.17. Compressor limiting 43

6.18. Unit limiting 44

6.19. Evaporator pumps 45

6.19.1. Inverter pump 45

6.20. Fans control....46

6.20.1. Fantroll 47
6.20.2. Fan Modular 50
6.20.3. Variable Speed Driver 50
6.20.4. Speedtroll 52
6.20.5. Double VSD 52
6.20.6. Fans control at startup in heating mode 52

6.21. Other functions .... 52

6.21.1. Hot Chilled Water Start....52
6.21.2. Fan Silent Mode 52
6.21.3. Double evaporator units 52

7. UNIT AND COMPRESSORS STATUS....53

8. START-UP SEQUENCE ....55

8.1. Unit start-up and shut-down flowcharts.... 55

8.2. Heat recovery start-up and shut-down flowcharts....57

9. USER INTERFACE....59

9.1. Mask tree 61

9.1.1. Details on Human Machine Interface structure 61

9.2. Languages....62

9.3. Units 62

9.4. Default passwords....63

APPENDIX A: DEFAULT SETTINGS 64

APPENDIX B: SOFTWARE UPLOAD TO THE CONTROLLER 69

B.1. Direct upload from PC 69

B.2. Upload from programming key....70

APPENDIX C: PLAN SETTINGS....71

APPENDIX D: COMMUNICATION....72

APPENDIX E: PLANTVISOR MONITORING ACCESS ....79

1 CONTENTS

This manual provides installation, setup and troubleshooting information for the control panel for Air Cooled Chillers with screw compressor.

Any operational description contained in this manual is based on control software ver. ASDU01C and following revisions.

Chiller operating characteristics and menu selections may vary with other versions of control software. Contact Daikin for software update information

1.1. Installation Precautions

Warning

Electric shock hazard. It can cause personal injury or equipment damage. This equipment must be properly grounded. Connections and service of the control panel must be performed only by personnel that are knowledgeable in the operation of the equipment being controlled.

Caution

Static sensitive components. A static discharge while handling electronic circuit boards can cause damage to the components. Discharge any static electrical charge by touching the bare metal inside the control panel before performing any service work. Never unplug any cables, circuit board terminal blocks, or power plugs while power is applied to the panel.

1.2. Temperature and Humidity considerations

The controller is designed to operate within an ambient temperature range of -40^ to +65^ with a maximum relative humidity of 95% (non-condensing).

2. GENERAL DESCRIPTION

The Control panel contains a microprocessor based controller which provides all monitoring and control functions required for the safe, efficient operation of the Chiller. The operator can monitor all operating conditions by using the built in panel 4 line by 20 character display and a 6 keys keypad or using an additional remote semi-graphical display or an IBM compatible computer running a compatible Daikin monitor software.

If a fault condition develops, the controller will shut the system down and activate an alarm output. Important operating conditions at the time when an alarm condition occurs is retained in the controller's memory to aid in troubleshooting and fault analysis.

The system is protected by a password scheme, which allows access only by authorized personnel. The operator must enter a password into the panel keypad before any configuration may be altered.

3. MAIN CONTROL SOFTWARE FEATURES

• Management of air cooled screw chillers with stepless screw compressors
• Control of evaporator outlet temperature within ± 0.1 °C (with a quasi-steady load).
- Management of sudden load reduction up to 50% with max 3°C controlled temperature oscillation
- Readout of all unit operating main parameters (temperature, pressures, etc.)
- Condensation control with step logic, single or double fan speed controllers and mixed step + speed control (speedtroll)
- Setting of a double leaving water temperature setpoint with local or remote switch.
- Setpoint override using an external signal (4-20 mA), evaporator return temperature or outside ambient temperature.
- Adjustable max pull-down rate to reduce under-shoot during loop pull-down.
- Hot Chilled Water Start feature to allow to startup the unit also with high temperature evaporator water.
- SoftLoad feature to reduce electrical consumption and peak demand charges during loop pulldown.
- Unit Limiting feature to allow to limit electrical consumption based either on current absorption (current limit) or on demand capacity (demand limit).
- Fan Silent Mode feature to allow the reduction of unit noise limiting fans speed on the base of a time schedule
- Management of two evaporator water pumps
- 6 keys keypad for a rapid interface. Operator can log chiller operating conditions on the backlight display 4 lines by 20 columns.
- Three levels of security protection against unauthorized changing.
- Diagnostic system for compressors which stores last 10 alarms with date, time, and working conditions at the time the alarm occurred
• Weekly and yearly start-stop time schedule.
- Easy integration into building automation systems via separate digital connection for unit start/stop and 4-20 mA signals for chilled water reset and demand limiting.
- Communications capabilities for remote monitoring, changing of setpoint, trend logging, alarm and event detection, via a Windows compatible interface.
- BAS communication capability via selectable protocol (Protocol Selectability) or Communication Gateway.
- Remote communications capabilities via analog or GSM Modem.

4. SYSTEM ARCHITECTURE

The modular architecture is based on the use of the ASDU01C Series control.

In particular, a base controller (large version, built-in display, or, optionally, semi graphical additional display) is used to control the basic unit functions and to manage the first two compressors; a second controller (large version) is used to manage the third and fourth compressor if they are present.

Several, up to four for each controller, controller expansion board are used to add optional features to the control.

Drivers for electronic expansion valve are foreseen as an optional feature.

The overall architecture is shown in fig. 1

graph TD
    A["pLAN"] --> B["pCO controller #1"]
    B --> C["J23 port"]
    C --> D["Supervisory Systems"]
    D --> E["pCOe Expansion #1"]
    D --> F["pCOe Expansion #2"]
    D --> G["pCOe Expansion #3"]
    D --> H["pCOe Expansion #4"]
    I["pLAN"] --> J["pCO2 controller #2"]
    J --> K["J23 port"]
    K --> L["pCOe Expansion #1"]
    K --> M["pCOe Expansion #2"]
    K --> N["pCOe Expansion #4"]
    O["pLAN"] --> P["EEXV Driver #1"]
    O --> Q["EEXV Driver #2"]
    O --> R["EEXV Driver #3"]
    O --> S["EEXV Driver #4"]
    T["pLAN"] --> U["Additional Display"]
    style A fill:#f9f,stroke:#333
    style I fill:#f9f,stroke:#333
    style O fill:#f9f,stroke:#333

Fig. 1 - Architecture

Electronic expansion valves drivers and the additional display are connected using pLAN network of ASDU01C controls while pCO ^e expansion boards are connected to ASDU01C controllers using the RS485 network dedicated to expansion.

Hardware configuration

Board Type Function Mandatory
pCO ^c #1	LargeBuilt In display (*)	Unit controlCompressors #1 & #2 control	Y
pCO ^e #2 Large		Compressors #3 & #4 control Only on 3	& 4 compressors units
pCO ^e #1 -		Additional hardware for compressors #1 & 2 or for compressors #3 & #4 (**)	N
pCO ^e #2 -		Heat recovery or Heat pump control (***)	N
pCO ^c #3 - Water pump control N
pCO ^c #4 -		Additional fan steps for compressors #1 & #2 or for compressors #3 & #4 (**)	N
EEXV driver #1 EVD200		Electronic expansion valve control for compressor #1	N
EEXV driver #2 EVD200		Electronic expansion valve control for compressor #2	N
EEXV driver #3 EVD200		Electronic expansion valve control for compressor #3	N
EEXV driver #4 EVD200		Electronic expansion valve control for compressor #4	N
Additional display PGD	Special characters or additional display N

(*) The contemporaneous presence of built-in display and additional PGD may be accepted.

(**) Depending on the pLAN address of the controller where the expansion is connected

(***) pCO ^c #2 connected to ASDU01C #2 is foreseen only for heat pump control

Control Panel

Control Panel is constituted by a backlight display 4 lines by 20 characters with a 6 key keypad whose functions will be illustrated in the following.

This display can be built-in as a part of the master controller (standard option), or it can be optionally a separate device based on the control panel PGD serigraphic technology.

Three industrial control modules with digital displays and control panels (no visible text or symbols)

Figure 2 - Control panel - PGD and Built-in display option

No setting is required for the built in display, while PGD device require addressing based on a procedure through keypad (see plan appendix for details).

67 82 24.2° 20.6° ZONE:3 156

Fig. 3 - PGD Display

4.2. Main board

The control board contains the hardware and the software necessary to monitor and to control the unit.

1 J1 G G0 3 Fusps 15 4 J2 B2 B3 GND AADC 5 J3 BC4 BC5 BC6 2 J4 V30 V1 V2 V3 V4 J5 J6 BT BT CT0 CT10 CT11 CT12 CT13 CT14 CT15 CT16 CT17 J19 J20 J21 J22 J23 J24 J25 J26 J27 J28 J29 J30 J31 J32 J33 J34 J35 J36 J37 J38 J39 J40 J41 J42 J43 J44 J45 J46 J47 J48 J49 J50 J51 J52 J53 J54 J55 J56 J57 J58 J59 J60 J61 J62 J63 J64 J65 J66 J67 J68 J69 J70 J71 J72 J73 J74 J75 J76 J77 J78 J79 J80 J81 J82 J83 J84 J85 J86 J87 J88 J89 J90 J91 J92 J93 J94 J95 J96 J97 J98 J99 J100 J101 J102 J103 J104 J105 J106 J107 J108 J109 J110 J111 J112 J113 J114 J115

1. Power supply G (+), G0 (-)
2. Status LED
3. Fuse 250Vac
4. Universal an alog inputs (NTC, 0/1V, 0/10V, 0/20mA, 4/20mA)
5. Passive analog inputs (NTC, PT1000, On-off)
6. Analogic outputs 0/10V
7. 24Vac/Vdc Digital inputs
8. 230Vac or 24Vac/Vdc Digital inputs
9. Synoptic terminal connection
10. Standard terminal (and program download) connector
11. Digital outputs (relays)
12. Expansion board connection
13. pLAN connection and microswitches
14. Serial card connection
15. Printer card connection
16. Memory expansion connection
17. Built-in panel

ON OFF R G V

Address Microswitches
Fig. 4 - controller

4.3. pCO ^e Expansion

The introduction of additional (optional) functionality in controller architecture requires the use of expansion boards shown in figures 5-6.

MCO® expansion board ① ② ③ ④ ⑥ ⑦ ⑧

Key

1. power supply connector [G (+), G0 (-)];

2. analogue output 0 to 10 V

3. network connector for expansions in RS485 (GND, T+, T-) or LAN (GND, T+);

4. 24VacVdc digital inputs;

5. yellow LED showing power supply voltage and 3 signalling LEDs;

6. serial address;

7. analogue inputs and probe supply;

8. relay digital outputs.

Figure 5 - pCO^e expansion

This device needs to be addressed to ensure correct communication with controller via RS485 protocol. Addressing microswitches are placed nearby status leds (refer to key ⑥ in figure 5). Once the address is correctly set the expansion could be linked to ASDU01C board. The correct connection is achieved connecting J23 pin on ASDU01C with J3 pin on the expansion board (note that expansion board connector is different from the controller one, but wires must be placed in the same positions of connectors). Expansion boards are only I/O extensions for the controller and don’t need any software.

Esempio indirizzo 1 Example address 1 Serial Address J3 ILAN Address switches

Fig. 6-pCO ^e detail: switches

As shown in figure 6, expansion boards have only four microswitches to set the net address. For more details on microswitches configuration refer to next section.

Three status leds are present, their status represent different status of the expansion board.

RED	YELLOW	GREEN	Meaning
- -		ON	Active CAREL/tLAN supervisor protocol
-	ON	-	Probe error
ON	- - “I/O mismatch” error caused by the inhibition matrix
flashing	- - Lack of communication
- - -	Waiting for the system startup by the master (max. 30 s)

4.4. EEXV Valve Driver

The valve drivers contain the software for the control of the electronic expansion valve and are connected to the battery group that provides to close valve in case of power failure.

EV driver valent opening power valent closing alarm UAV EV driver with Address ing

Fig. 7 - EXV driver

4.4.1. Meaning of the Driver EEXV status leds

Under normal conditions five(5) LED indicates:

• POWER: (yellow) remains On in presence of supply. Remains Off in case of battery operation OPEN: (green) Flashing during the valve opening. On when valve is fully open.
• CLOSE: (green) Flashing during the valve closing. On when valve is fully close.
  • Alarm: (red) On or flashing in case of hardware alarm.
• pLAN: (green) On during the normal working of pLAN.

In presence of critical alarm situations, the combination of LED On identifies the alarm as shown below.

Highest priority is level 7. In the case more alarms occur is visualized that with higher priority.

Alarms that stops the system PRIORITY LED OPEN LED CLOSE LED POWER LED ALARM
Eprom reading error 7		Off Off	On	Flashing
Valve open in case of lack of supply	6	Flashing	Flashing	On	Flashing
At start up, wait for battery loading (parameter......)	5	Off	On	Flashing	Flashing
Other alarms	PRIORITY LED OPEN LED CLOSE			LED POWER	LED ERROR
Motor connection error	4	Flashing	Flashing	On	On
Probe error	3	Off	Flashing	On	On
Eeprom writing error	2	-	-	On	On
Battery error	1	-	-	Flashing	On
PL pLAN		LED pLAN
Connection OK		On
Driver connection or address error = 0 Off
The Pco3 Master doesn’t answer		Flashing

4.5. Addressing of pLan/RS485

To get the correct functionality of the pLAN net system, is necessary to address correctly all the installed components. Each component, as previously described, has a series of microswitch that must be settled as specified in the following table.

pLAN component Microswitches
1 2 3 4 5 6
COMP. BOARD #1 ON		OFF OFF OFF	OFF OFF
COMP. BOARD #2	OFF	ON	OFF OFF OFF	OFF
DRIVER EXV #1 ON ON			OFF OFF OFF	OFF
DRIVER EXV #2	OFF OFF		ON	OFF OFF OFF
DRIVER EXV #3 ON		OFF	ON	OFF OFF OFF
DRIVER EXV #4	OFF	ON ON		OFF OFF OFF
Additional DISPLAY ON	ON ON			OFF OFF OFF
RS485 component Microswitch
1 2 3 4
EXP. BOARD #1 ON		OFF OFF OFF
EXP. BOARD #2	OFF	ON	OFF OFF
EXP. BOARD #3 ON		ON	OFF OFF
EXP. BOARD #4	OFF OFF		ON	OFF

4.6. Software

A unique control software is installed on both ASDU01C controllers (if two are present), the unit controller is directly recognized on the basis of the pLAN address.

No software is installed on pCO ^e boards and on EEXV drivers (a factory-installed software is used).

A pre-configuration procedure is available in each ASDU01C controller to recognize the whole network hardware configuration; the configuration is stored in the controller in a permanent memory and an alarm is generated if the hardware configuration would change during the operation (network or boards faults or added boards).

The pre-configuration procedure will automatically start at the first bootstrap of the unit (after the software is installed); it is possible to activate it manually (network refresh) if network configuration changes, either if an expansion is permanently removed or if a new expansion is linked after the first software bootstrap.

Changes in the network configuration without network refresh will generate alarms, either if an expansion is removed (or faulted) or if a new expansion is added.

The configuration of functions requiring expansion boards are allowed only if expansion boards have been recognized in the network configuration.

Network refresh is required in case of a substitution of a ASDU01C controller.

Network refresh is not required in case of a substitution of a fault expansion board already used in the system.

4.6.1. Version identification

To identify unambiguously the software class and version (also with respect to other Daikin control software) a string made of four fields is used:

C	C	C	F	M	M	m
1	2	3

A three-digit literal field (C_1C_2C_3) to identify the class of units for which the software is usable

The first digit C_1 is for chillers cooling type and will assume the following values:

• A : for air cooled chillers
• W : for water cooled chiller

The second digit C_2 is for compressor type and will assume the following values:

• S : for screw compressors
• R : for reciprocating compressors
• Z : for scroll compressors
• C : for centrifugal compressors
• T : for turbocor compressors

The third digit C_3 is for evaporator type and will assume the following values:

• D : for direct expansion evaporator
• R : for remote direct expansion evaporator
• F : for flooded evaporator

• A single-digit literal (F) field to identify the unit family

Within the scope of this document (screw chillers identified by C _2 field) it will assume the following values

• A : Frame 3100 family
• B : Frame 3200 family
• C : Frame 4 family
• U : when the software is applicable to all families within the class

• A major version two-digit numeric field (MM)
• A minor version single-digit literal field (m)

Within the scope of this document the first version is :

ASDU01C

Any version is also identified by a release date.

The first three digits of the version string will never be changed (otherwise a new unit class, and consequently a new software is released).

The fourth digit will change if a family-specific feature is added and it is not applicable to other families; in this case the U value may not be used anymore and a software for any family will be released. When this happens the versions digit is reset to the lower value.

The major version number (MM) will increase any time a completely new function is introduced in the software, or the minor version digit as reached the maximum allowed value (Z).

The minor version digit (m) is increased any time minor modification is introduced in the software without modifying its main working mode (this includes bugs fixing and minor interface modifications).

Engineering version, that meanings versions under tested, is identified adding to the version string the letter E followed by a number digit identifying the progression of engineering versions.

5. PHYSICAL INPUTS AND OUTPUTS

The following parameters are inputs and outputs of the electronic boards.

They are used internally and/or sent to pLAN and supervisory system according to software requirements and to the monitoring requirements

5.1. ASDU01C controller #1 - Base unit and compressors #1 & #2 control

Analog Input Digital Input
Ch.	Description Type			Ch.	Description
B1	Oil Pressure #1	4-20mA	DI1	On/Off Comp #1 (Cir. #1 Shut-off)
B2	Oil Pressure #2	4-20mA	DI2	On/Off Comp #2 (Cir. #2 Shut-off)
B3	Suction Pressure #1 (*)	4-20mA	DI3	Evaporator Flow Switch
B4	Discharge Temperature #1	PT1000	DI4	PVM or GPF Unit or #1 (**)
B5	Discharge Temperature #2	PT1000	DI5	Double setpoint
B6	Discharge Pressure #1	4-20mA	DI6	High Press. Switch #1
B7	Discharge Pressure #2	4-20mA	DI7	High Press. Switch #2
B8	Suction Pressure #2 (*)	4-20mA	DI8	Oil Level Switch #1 (**)
B9	Entering water Temp. Sensor	NTC	DI9	Oil Level Switch #2 (**)
B10	Leaving Water Temp. Sensor	NTC	DI10	Low Press. Switch #1
	DI11			Low Press. Switch #2
	DI12			Transition or Solid State Fault #1
	DI13			Transition or Solid State Fault #2
	DI14			Overload or Motor Protection #1
	DI15			Overload or Motor Protection #2
	DI16			Unit On/Off
	DI17			Remote On/Off
	DI18			PVM or GPF #2 (**)

Analog Output				Digital Output
Ch.	Description Type			Ch.	Description
AO1	Fan Speed control #1	0-10Vdc	DO1	Start Comp #1
	Second Fan Speed control #1 or Fan Modular output #1	0-10Vdc	DO2	Load Comp #1
AO2	SPARE		DO3	Unload Comp #1
AO3	Fan Speed control #2	0-10Vdc	DO4	Liquid Injection #1
AO4	Second Fan Speed control #2 or Fan Modular output #2	0-10Vdc	DO5	Liquid Line #1 (*)
AO5	SPARE	DO6	1	^st Fan step #1
		DO7	2	^nd Fan Step #1
		DO8	3	^rd Fan Step #1
		DO9	Start Comp #2
		DO10		Load Comp #2
		DO11		Unload Comp #2
		DO12		Evaporator Water Pump
		DO13		Unit Alarm
		DO14		Liquid Injection #2
		DO15		Liquid Line #2 (*)
		DO16		1^st Fan step #2
		DO17		2^nd Fan Step #2
		DO18		3^rd Fan Step #2

(*) In case EEXV driver is not installed. If EEXV driver is installed, low pressures should be detected through EEXV driver.
(**) Optional

5.2. ASDU01C controller #2 - Compressors #3 & #4 control

Analog Input				Digital Input
Ch.	Description Type			Ch.	Description
B1 Oil	Pressure #3	4-20mA	DI1 On	/Off Comp #3
B2 Oil	Pressure #4	4-20mA	DI2 On	/Off Comp #4
B3 Suction Pressure #3 (*)		4-20mA	DI3 SP	ARE
B4 Discharge Temperature #3		PT1000	DI4 PVM or GPF #3 (***)
B5 Discharge Temperature #4		PT1000	DI5 SP	ARE
B6 Discharge Pressure #3		4-20mA	DI6 High Press. Switch #3
B7 Discharge Pressure #4		4-20mA	DI7 High Press. Switch #4
B8 Suction Pressure #4 (*)		4-20mA	DI8 Oil	Level Switch #3 (***)
B9 Evap. # 2 Entering Water Temp. (**)		NTC	DI9 Oil	Level Switch #4 (***)
B10 Evap. # 2 Leaving Water Temp. (**)		NTC	DI10 Low Press. Switch #3 (***)
			DI11 Low Press. Switch #4 (***)
			DI12 Transition or Solid State Fault #3
			DI13 Transition or Solid State Fault #4
			DI14 Overload or Motor Protection #3
			DI15 Overload or Motor Protection #4
			DI16 1stor 2ndfan speed control fault #3 (**)
			DI17 1stor 2ndfan speed control fault #4 (**)
			DI18 PVM or GPF #4 (***)

Analog Output				Digital Output
Ch.	Description Type			Ch.	Description
AO1	Fan Speed control #3	0-10Vdc		DO1	Start Comp #3
AO2	Second Fan Speed control #3 or Fan Modular output #3	0-10Vdc		DO2	Load Comp #3
AO3	SPARE			DO3	Unload Comp #3
AO4	Fan Speed control #4	0-10Vdc		DO4	Liquid Injection #3
AO5	Second Fan Speed control #4 or Fan Modular output #4	0-10Vdc		DO5	Liquid Line #3 (*)
AO6	SPARE			DO6 1	^st Fan step #3
				DO7 2	^nd Fan Step #3
				DO8 3	^rd Fan Step #3
				DO9	Start Comp #4
				DO10	Load Comp #4
				DO11	Unload Comp #4
				DO12	SPARE
				DO13	SPARE
				DO14	Liquid Injection #4
				DO15	Liquid Line #4 (*)
				DO16	1^st Fan step #4
				DO17	2^nd Fan Step #4
				DO18	3^rd Fan Step #4

(*) In case EEXV driver is not installed. If EEXV driver is installed, low pressures are detected through EEXV driver.
(**) Only for units with 2 evaporators
(***) Optional

5.3. pCO ^e expansion #1 – Additional hardware

5.3.1. Expansion connected to ASDU01C #1

Analog Input				Digital Input
Ch.	Description Type			Ch.	Description
B1 Comp. Capacity Sensor #1 (*) 4-20mA DI1 SPARE
B2 Comp. Capacity Sensor #2 (*) 4-20mA DI2 SPARE
B3 Suction Temp #1 (**)		NTC DI3	Low Pressure Switch #1 (*)
B4 Suction Temp #2 (**)		NTC DI4	Low Pressure Switch #2 (*)

Analog Output				Digital Output
Ch.	Description Type			Ch.	Description
AO1	$PARE DO1 Compressor #1 alarm (*)
				DO2	Compressor #2 alarm (*)
				DO3	Economizer #1 (*)
				DO4	Economizer #2 (*)

(*) Optional

(**) In case EEXV driver is not installed. If EEXV driver is installed, suction temperature is detected through EEXV driver.

5.3.2. Expansion connected to ASDU01C #2

Analog Input				Digital Input
Ch.	Description Type			Ch.	Description
B1 Comp. Capacity Sensor #3 (*) 4-20mA DI		SPARE
B2 Comp. Capacity Sensor #4 (*) 4-20mA DI2		SPARE
B3 Suction Temp #3 (**)		NTC DI3	Low Pressure Switch #3 (*)
B4 Suction Temp #4 (**)		NTC DI4	Low Pressure Switch #4 (*)

Analog Output				Digital Output
Ch.	Description Type			Ch.	Description
AO1	$PARE DO1 Compressor #3 alarm (*)
				DO2	Compressor #4 alarm (*)
				DO3	Economizer #3 (*)
				DO4	Economizer #4 (*)

(*) Optional

(**) In case EEXV driver is not installed. If EEXV driver is installed, suction temperature is detected through EEXV driver.

5.4. pCO ^e expansion #2 – Heat recovery or heat pump control

The heat recovery and heat pump options will alternative; just one of them may be used and are specified in the manufacturer setup

5.4.1. Heat recovery option

Analog Input				Digital Input
Ch.	Description	Type		Ch.	Description
B1	Ambient temperature sensor			DI1	Heat Recovery switch
B2	SPARE			DI2	Heat Recovery Flow switch
B3	Entering HR water sensor	NTC DI3		SPARE
B4	Leaving HR water sensor	NTC DI4		SPARE
Analog Output				Digital Output
Ch.	Description Type			Ch.	Description
AO1	Heat Recovery Bypass valve (*) 4-20mA	DO1 4 Way		valve HR #1
	DO2 4 Way valve HR #2
	DO3 4 Way valve HR #3
	DO4 4 Way valve HR #4

(*) Optional

5.4.2. Heat pump option

5.4.2.1. Expansion connected to ASDU01C #1

Analog Input				Digital Input
Ch.	Description Type			Ch.	Description
B1	Ambient temperature sensor	NTC DI1	Heating	/Cooling Switch
B2	Defrost Sensor #1 (*)	NTC DI2	SPARE
B3	Defrost Sensor #2 (*)	NTC DI3	SPARE
B4	SPARE		DI4	SPARE

Analog Output			Digital Output
Ch.	Description	Type	Ch.	Description
AO1	Heat Pump Bypass valve 4-20mA DO1	4 Way valve	Comp	#1
		DO2 Suction liquid injection #1
		DO3 4 Way valve Comp #2
		DO4 Suction liquid injection #2

(*) In case EEXV driver is not installed. If EEXV driver is installed, defrost temperature should be detected through EEXV driver (suction temperature).
(**) Optional

5.4.2.2. Expansion connected to ASDU01C #2

Analog Input				Digital Input
Ch.	Description Type			Ch.	Description
B1	SPARE	NTC DI1	SPARE
B2	Defrost Sensor #3 (*)	NTC DI2	SPARE
B3	Defrost Sensor #4 (*)	NTC DI3	SPARE
B4	SPARE		DI4 SPARE

Analog Output				Digital Output
Ch.	Description	Type		Ch.	Description
AO1	SPARE	4-20mA	DO1 4 Way valve Comp #3
		DO2 Suction liquid injection #3
		DO3 4 Way valve Comp #4
		DO4 Suction liquid injection #4

(*) In case EEXV driver is not installed. If EEXV driver is installed, defrost temperature should be detected through EEXV driver (suction temperature).

5.5. pCO ^e expansion #3 – Water pump control

Analog Input				Digital Input
Ch.	Description	Type		Ch.	Description
B1	SPARE	DI1	First pump Alarm
B2	SPARE	DI2	Second pump Alarm
B3	SPARE		DI3	First HR pump Alarm (*)

B4 SPARE DI4 Second HR pump Alarm (*)

Analog Output				Digital Output
Ch.	Description Type			Ch.	Description
AO1	$PARE DO1 Second water pump
	DO2 SPARE
	DO3 First HR pump (*)
		DO4 Second HR pump (*)

(*) Optional

5.6. pCO ^e expansion #4 – Fan step control

5.6.1. Expansion connected to ASDU01C #1

Analog Input				Digital Input
Ch.	Description Type			Ch.	Description
B1	Setpoint Override	4-20mA		DI1	Current Limit Enable
B2	Demand Limit	4-20mA		DI2	External Alarm
B3	SPARE	DI3 SPARE		RE
B4	Unit Amps.	4-20mA		DI4	SPARE

Analog Output				Digital Output
Ch.	Description Type			Ch.	Description
AO1	SPARE			DO1 4°	Fan Step comp. #1
				DO2	5° Fan Step comp. #1
				DO3	4° Fan Step comp. #2
				DO4	5° Fan Step comp. #2

(*) Only if heat pump board is not present

5.6.2. Expansion connected to ASDU01C #2

Analog Input				Digital Input
Ch.	Description Type			Ch.	Description
B1	SPARE	DI1 SPARE
B2	SPARE	DI2 SPARE
B3	SPARE	4-20mA		DI3 SPARE
B4	SPARE	4-20mA		DI4 SPARE

Analog Output				Digital Output
Ch.	Description Type			Ch.	Description
AO1	SPARE			DO1 4°	Fan Step comp. #3
				DO2	5° Fan Step comp. #3
				DO3	4° Fan Step comp. #4
				DO4	5° Fan Step comp. #5

(*) Only if heat pump board is not present

5.6.3. EXV Driver

Analog Input
Ch.	Description Type
B1	Suction temperature #1, #2, #3, #4 (*)	NTC
B2	Suction pressure #1, #2, #3, #4 (*)	4-20mA

(*) Depending on pLan address of Driver

6. MAIN CONTROLLER FEATURES

In the following the main features of the control software are described

6.1. Controller purpose

Then system will control the evaporator leaving water temperature to keep it at a setpoint value.

The system operates to optimize components performances from the point of view of their efficiency and of their duration.

The system assures a safe operation of the unit and of all components and prevents dangerous situations.

6.2. Unit enabling

The control allows different ways to enable/disable the unit:

• Keypad : Enter key on the keypad allows to switch between “Power OFF” mode and “Unit On” if other signals allows this state
• Local Switch: when the digital input “Unit On/Off” is open the unit is in “Local switch Off”; when the digital input “Unit On/Off” is closed the unit may be in “Unit On” or “Remote switch Off” on the basis of the “Remote On/Off” digital input
• Remote Switch: when the local switch is On (“Unit On/Off” digital input closed) if the digital input “Remote On/Off” is closed the unit is in “Unit On”, when digital input “Remote On/Off” is open the unit is in “Remote switch Off”
• Network : a BAS or a Monitoring system may send an On/Off signal trough the serial line connection to put the unit on or in “Rem. Comm. Off”
• Time schedule : a timetable allows to program “Time Schedule Off” on a week base; several holiday days are include.
• Ambient LockOut : the unit is not enabled to operate unless the ambient temperature is higher than an adjustable value (default 15.0°C (59.0 F))

To be in “Unit On” all the allowed signals must enable the unit.

6.3. Unit modes

The unit is able to work in the following modes:

- Cooling:

When this mode is selected the control will operate to cool the evaporator water; the setpoint range is +4.0 | +14.0 °C, (39.2 | 57.2 F) a freeze alarm setpoint is set to 2 °C (34.6 F) (adjustable by the operator in the range +1 | +3 °C (33.8 | 37.4 F)) and a freeze prevent setpoint is set to 3 °C (37.4 F) (adjustable by the operator in the range: “freeze alarm setpoint” +1 | +3 °C (“freeze alarm setpoint” +1.8 F | 37.4 F)).

- Cooling/Glycol:

When this mode is selected the control will operate to cool the evaporator water; the setpoint range are -8^ +14.0^ (17.6 57.2 F), a freeze alarm setpoint are set to -10^ (14.0 F) (adjustable by the operator in the range -12^ -9^ (10.4 15.8 F)) and a freeze prevent setpoint are set to -9^ (15.8 F) (adjustable by the operator in the range “freeze alarm setpoint” + 1^ -9^ (“freeze alarm setpoint” + 1.8 F 15.8 F))

- Ice:

When this mode is selected the control will operate to cool the evaporator water; the setpoint range are -8^ +14.0^ (17.6 | 57.2 F), a freeze alarm setpoint are set to -10^ (14.0 F) (adjustable by the operator in the range -12^ -9^ (10.4 | 15.8 F)) and a freeze prevent setpoint are set to -9^ (15.8 F) (adjustable by the operator in the range “freeze alarm setpoint” + 1^ -9^ (“freeze alarm setpoint” + 1.8 F | 15.8 F))

While working in ice mode compressors are not be allowed to unload but are stopped using a step procedure (se § 6.5.1)

- Heating:

When this mode is selected the control will operate to heat the evaporator water; the setpoint range is +30 | +45°C (86 | 113°C), a hot water alarm setpoint are set to 50°C (adjustable by the operator in the range +46 | +55°C (114.8 | 131 F)) and a hot prevent setpoint are set to 48°C (118.4 F) (adjustable by the operator in the range +46°C | “hot water alarm setpoint” + 1°C (114.8 F | “hot water alarm setpoint” + 1.8 F)).

• Cooling + Heat Recovery:

Setpoints and freeze protection are managed as described in the cooling mode; in addition the control will enable the heat recovery input and outputs foreseen on the expansion #2

• Cooling/Glycol + Heat Recovery:

Setpoints and freeze protection are managed as described in the cooling/glycol mode; in addition the control will enable the heat recovery input and outputs foreseen on the expansion #2

- Ice + Heat Recovery:

Setpoints and freeze protection are managed as described in the ice mode; in addition the control will enable the heat recovery input and outputs foreseen on the expansion #2

The selection between cooling, cooling/glycol and ice mode are performed by the operator using the interface under password.

The switching between cooling and ice and heating modes will cause the unit shutdown and than the switching between the two modes.

6.4. Setpoints management

The control is able to manage the evaporator leaving water temperature on the base of several inputs:

- Changing the setpoint from the keypad

• Switching between the main setpoint (set by keypad) and an alternative value (set by keypad to) on the base of a digital input state (double setpoint function)
• Receiving a setpoint by a monitoring system or a BAS connected via serial line
• Resetting the setpoint of the base of analogic inputs

The control shows the source of the used (Actual) setpoint:

Local : the main setpoint set by keypad is being used

Double : the alternative setpoint set by keypad is being used

Reset : the setpoint is being reset by external input

The following setpoint reset methods are available to modify the local or double setpoint:

None : local or double setpoint are used on the base of the double setpoint digital input. This is called “base setpoint”

4-20mA : base setpoint is modified on the base of an user analog input

OAT : base setpoint is modified on the base of outside ambient temperature (if available)

Return : base setpoint is modified on the base of evaporator entering temperature

Network : the setpoint sent by serial line is used

In the case of a failure in the serial connection or in the 4-20mA input the base setpoint is used. In case of a setpoint reset, the system display will show the type of reset.

6.4.1. 4-20mA setpoint override

The base setpoint is modified on the base of the value of the analog input and of a max reset value, as shown in fig 8.

Fig.8 - 4-20mA setpoint override

6.4.2. OAT setpoint override

To enable the OAT setpoint override the unit limiting control expansion board pCO ^c #2 is required, with the ambient sensor installed.

The base setpoint is modified on the base of outside ambient temperature and of a max reset value, of a value of OAT to start reset and a value of OAT to apply max reset, as shown in fig 9

graph TD
    A["Base Setpoint"] --> B["Max Reset"]
    B --> C["Used Setpoint"]
    C --> D["Reset Delta T"]
    D --> E["Start Reset T"]
    E --> F["OAT"]

Fig. 9 - OAT setpoint override

6.4.3. Return setpoint override

The base setpoint is modified on the base of evaporator T and of a max reset value, of a value of OAT to start reset and a value of OAT to apply max reset, as shown in fig 10

graph TD
    A["Used Setpoint"] --> B["Max Reset"]
    B --> C["Base Setpoint"]
    C --> D["Evap ΔT"]
    D --> E["Start Reset T"]
    E --> F["Reset Delta T"]

Fig. 10 - Return setpoint override

6.5. Compressors capacity control

Two types of capacity control are implemented:

• Automatic: the compressor start/stop and its capacity are automatically managed by the software to allow the setpoint respect
• Manual: the compressor is started by the operator and its capacity is managed by the operator acting on the system terminal. In this case the compressor will not be used by the software to allow the setpoint respect.

Manual control is automatically switched to Automatic control if any safety action is required on the compressor (safety standby or unloading or safety shutdown). If this case the compressor remains in Automatic and must be re-switched to Manual by the operator if required.

Compressors in manual mode are automatically switched in automatic mode at their shutdown.

The compressor load by may be evaluated on the basis of:

• Calculation of loading and unloading pulses
- Analogic slide valve position signal (optional)

6.5.1. Automatic Control

A specialized PID algorithm is used to determine the magnitude of corrective action on capacity control solenoid.

The compressor loading or unloading is obtained keeping the loading or unloading solenoid energized for a fixed time (pulse duration), while the time interval between two subsequent pulses are evaluated by a PD controller (see fig. 11).

If the output of the PD algorithm doesn't change, the time interval among pulses is constant; this is the integral effect of the controller, at a constant error the action is repeated with a constant time (with the additional feature of a variable integral time).

The compressor load evaluation (based on analog slide valve position or calculation ^1 ) is used to allow the start of another computer or the stop of a running one.

It is required to define the proportional band and the derivative time of the PD control, together with the pulse duration and a minimum and maximum value for pulses interval.

The minimum pulse interval is applied when the maximum correction action is required, while the maximum interval is applied when the minimum correction action is required.

A dead band is introduced to allow to reach a stable compressor condition.

Fig. 12 shows the proportional action of the controller as a function of the input parameters.

The proportional gain of the PD controller is given by:

$$ K _ {p} \quad \text { Max } \cdot \frac {\text { RegBand }}{2} $$

The derivative gain of the PD controller is equal to:

$$ _ {d} \quad_ {p} T _ {\tilde {d}} K \cdot = $$

where T_d is the input derivative time.

In addition to the specialized PID controller, a max pull-down-rate is introduced in the control; this meanings that if the controlled temperature is approaching the setpoint with a rate greater than a set value, any loading action is inhibited, even if require by the PID algorithm. This makes the control slower but allows to avoid oscillations around setpoint.

The controller is designed to act both as a “chiller” and as a “heat pump”; when the “chiller” option is selected the controller will load the compressor if the measured temperature is above the setpoint and will unload the compressor if the measured temperature is below the setpoint.

When the “heat pump” option is selected the controller will load the compressor if the measured temperature is below the setpoint and will unload the compressor if the measured temperature is above the setpoint.

The starting sequence of compressors is selected on the base of lower working hours amount (it means that the first compressor that is started is the one with the lower amount of working hour); between two compressors with the same operating hours, the compressor with minimum number of starts will start first.

A manual sequencing of compressors is possible.

The start of the first compressor is allowed only if the absolute value of difference between the measured temperature and the setpoint exceeds a Startup T value.

The stop of the last compressor is allowed only if the absolute value of the difference between the measured temperature and the setpoint exceeds a Shutdown T value.

A FILO (First In - Last Off) logic is adopted.

The start/loading and unloading/stop sequence will follow the schemes in table 2 and table 3, where RDT is the Reload/Reunload T , a set value (that represent the minimum difference between the evaporator leaving water temperature and its setpoint) that will a running compressor to be reload when a compressor is shutdown or a running compressor to be unload when a new compressor is started.

This is made to keep the unit total capacity at the same level when the evaporator leaving water temperature is close to the setpoint and a compressor stops, or another compressor starts, is required.

In Ice mode, while the compressor loading is not affected, the compressors downloading is inhibited. When downloading is required compressors are shutdown on the basis of the evaporator leaving water temperature.

In particular, said Stp the evaporator leaving temperature setpoint, SDT the shutdown T value and n the number of compressors, the scheme in table 6 is used.

In addition when the heat pump option is installed, the compressor could be managed using a variable speed driver (inverter). An analog output of pCO^3 board is used to control the compressor speed with a 0-10V signal. Load management will still determine the time distance between load/unload pulses where pulse in this case means relative variation of the output voltage. The magnitude of the variation could be adjusted under manufacturer password.

When the unit is working in heating mode the maximum speed will be the nominal speed (default value 67Hz).

When the unit is working in cooling mode an overboost option (activated either with the digital input 2 on the expansion board #2 or automatically if the outside ambient temperature is greater than 35^ C and disabled when it falls below 34^ C) is managed. It allows the compressor to run at its full speed of 90Hz if the maximum available capacity is reached. When the overboost is disabled the valve opening (if the electronic expansion valve)

Fixed pulse duration Variable pulse interval

Fig. 11 - Loading or unloading pulses

Fig. 12 - PD controller proportional action

6.5.2. Manual Control

The control will apply a fixed duration pulse (the magnitude is the pulse duration set in the automatic control) for each manual (by keyboard) load or unload signal.

In the manual control the load/unload action follows any pressing of defined up/down keys. (see fig. 13).

Load/Unload key press Load/Unload pulse

Fig. 13 - Compressor manual control

Table 2 - Compressors startup and loading management (4 compressors unit)

Step n. Leader Comp. Lag 1 Comp. Lag 2 Comp. Lag 3 Comp.
0 Off Off Off Off
1	If (T-SetP) < Startup DT & Coolingor (SetP-T) < Startup DT & Heating... Waiting ...
2 Start Off Off	Off
3 Load up to 75% Off Off Off
4	If T in Regulation Band... Wait interstage time ...
5	If T is approaching SetP... Waiting ...
6aSetP-RDT<T< SetP-RDT6bSetP-RDT<T or T> SetP-RDT	Unload up to 50% Start Off Off
	Fixed at 75% Start Off Off
7	Fixed at 75% or 50%	Load up to 50% Off Off
8(if leader at 50%)	Load up to 75% Fixed at 50% Off Off
9 Fixed at 75%	Load up to 75% Off Off
10	If T in Regulation Band... Wait interstage time ...
11	If T is approaching SetP... Waiting ...
12aSetP-RDT<T< SetP-RDT12bSetP-RDT<T or T> SetP-RDT	Fixed at 75% Unload up to 50% Start		Off
	Fixed at 75%	Fixed at 75%	Start	Off
13	Fixed at 75%	Fixed at 75% or 50%	Load up to 50%	Off
14(if lag1 at 50%)	Fixed at 75%	Load up to 75%	Fixed at 50%	Off
15	Fixed at 75%	Fixed at 75%	Load up to 75%	Off
16	If T in Regulation Band... Wait interstage time ...
17	If T is approaching SetP... Waiting ...
18aSetP-RDT<T< SetP-RDT18bSetP-RDT<T or T> SetP-RDT	Fixed at 75% Fixed at 75% Unload up to 50% Start
	Fixed at 75% Fixed at 75% Fixed at 75% Start
17	Fixed at 75%	Fixed at 75%	Fixed at 75% or 50%	Load up to 50%
18(if lag2 at 50%)	Fixed at 75%	Fixed at 75%	Load up to 75%	Fixed at 50%
19	Fixed at 75%	Fixed at 75%	Fixed at 75%	Load up to 75%
20	Load up to 100%	Fixed at 75%	Fixed at 75%	Fixed at 75%
21	Fixed at 100%	Load up to 100%	Fixed at 75%	Fixed at 75%
22	Fixed at 100%	Fixed at 100%	Load up to 100%	Fixed at 75%
23	Fixed at 100%	Fixed at 100%	Fixed at 100%	Load up to 100%
24	Fixed at 100%	Fixed at 100%	Fixed at 100%	Fixed at 100%

Table 3 - Compressors unloading and shutdown management (4 compressors unit)

Step n. Leader Comp. Lag 1 Comp. Lag 2 Comp. Lag 3 Comp.
0 100% 100%	100% 100%
1 Fixed at 100%	Fixed at 100%	Fixed at 100%	Unload up to 75%
2 Fixed at 100%	Fixed at 100%	Unload up to 75%	Fixed at 75%
3 Fixed at 100%	Unload up to 75%	Fixed at 75%	Fixed at 75%
4 Unload up t75%	Fixed at 75%	Fixed at 75%	Fixed at 75%
5 Fixed at 75%	Fixed at 75%	Fixed at 75%	Unload up to 50%
6 Fixed at 75%	Fixed at 75%	Unload up to 50%	Fixed at 50%
7 Fixed at 75%	Fixed at 75%	Fixed at 50%	Unload up to 25%
8	If T is approaching SetP... Waiting ...
9aSetP-RDTFixed at 75% Fixed at 75% Load up to 75% Stop	Fixed at 75%	Fixed at 75%	Load up to 75%	Stop
9bSetP-RDTFixed at 75% Fixed at 75%Fixed at Stop	Fixed at 75%	Fixed at 75%	Fixed at	Stop
10(if lag2 at 75%)	Fixed at 75%	Fixed at 75%	Fixed at Off
11 Fixed at 75%	Unload up to 50%	Fixed at 50%	Off
12 Fixed at 75%	Fixed at 50%	Fixed at 25%	Off
13	If T is approaching SetP... Waiting ...
14aSetP-RDTFixed at 75% Load up to 75% StopOff	Fixed at 75%	Load up to 75%	Stop	Off
14bSetP-RDTFixed at 75% Fixed at 50%StopOff	Fixed at 75%	Fixed at 50%	Stop	Off
15(if lag1 at 75%)	Fixed at 75%	Unload up to 50%	Off	Off
16	Unload up to 50%	Fixed at 50%	Off Off
17 Fixed at 50%	Unload up to 25%	Off	Off
18	If T is approaching SetP... Waiting ...
19aSetP-RDTLoad up to 75% Stop Off Off	Load up to 75%	Stop	Off	Off
19bSetP-RDTFixed at 50%StopOffOff	Fixed at 50%	Stop	Off	Off
20	Unload up to 25%	Off	Off	Off
21	If T is approaching SetP... Waiting ...
22	If (SetP - T) < Shutdown DT & Coolingor (T - SetP) < Shutdown DT & Heating....Wait....
23	Stop	Off	Off	Off
24	Off	Off	Off	Off

Table 4 - Compressors shutdown scheme in Ice mode

Evap Lvg Temp Compressors status
< SetP> SetP – SDT/n	All compressors allowed to run
< SetP– SDT/n> SetP – 2*SDT/n	(n-1) compressors allowed to run
< SetP – 2*SDT/n> SetP – 3*SDT/n	(n-2) compressors allowed to run
< SetP – 3*SDT/n> SetP – 4*SDT/n	(n-3) compressors allowed to run
> SetP – 4*SDT/n No compressor allowed to run

6.6. Compressors timing

Compressors operation will meet four timer requirements:

• Minimum time between a same compressor starts (start to start timer): it is the minimum time between two starts of the same compressor
• Minimum time between different compressor starts : it is the minimum time between two starts of two different compressors
• Minimum time compressor on (start to stop timer): it is the minimum time the compressor may run; the compressor cannot be stopped (unless an alarm occurs) if this timer is not expired
• Minimum time compressor off (stop to start timer): it is the minimum time the compressor may be stopped; the compressor cannot be start if this timer is not expired

The minimum time compressor off (stop to start timer) will have two different settings; one applicable to cooling, cooling/glycol and heating mode and the other one applicable in ice mode.

6.7. Compressors protection

To protect compressor against loss of lubrication, the compressor pressure ratio is continuously checked; a minimum value is set for compressor minimum and maximum load; for intermediate compressor loads a linear interpolation are executed.

The low pressure ratio alarm will occur if pressure ratio remains lower than the minimum value at rated compressor capacity while a timer expiration.

At the startup the compressor is completely downloaded and its loading will not be enabled up to the pressure ratio exceeds a set value (default equal to 2).

6.8. Compressors startup procedure

Before to start compressors the unloading solenoid valve is energized up to a timer is expired (default 60 sec).

At compressor startup the control will be executed a series of prepurge procedure to evacuate evaporator; the prepurge procedure will depend on the expansion valve type.

Prepurge procedure will not be executed if the evaporating pressure is below the low pressure alarm setpoint (vacuum conditions inside the evaporator).

The compressor will not be allowed to load up to the discharge superheat exceeds a set value (default 12.2 °C, 22 F) for a time longer than a set value (default 30 sec).

6.8.1. Fan pre-starting in heating mode

When the unit is operated in heating mode, if the outside ambient temperature is lower than an fixed threshold of 10.0^ C (50.0F) before the compressor is started and the start-up procedure is initiated all fans are started with a constant delay between each other.

6.8.2. Prepurge procedure with electronic expansion

At the compressor start the EEXV are completely closed up to the saturated temperature at the evaporator pressure reaches the value of -10^ (14 F) (adjustable in the range -12 - 12 -4^ (10.4 | 24.8 F)), then the valve are opened at a fixed position (adjustable by the manufacturer with a default value equal to 20% ) up to a timer is expired (default 30 sec).

6.8.3. Prepurge procedure with thermostatic expansion

At the compressor start the liquid line solenoid is completely closed up to the saturated temperature at the evaporator pressure reaches the value of -10^ (14 F) (adjustable in the range -12 -4^ (10.4 24.8 F)), then the valve is opened up to a timer is expired; this procedure is repeated for a number of times adjustable by the operator (default is 1 time).

6.8.4. Oil heating

The startup of compressors will not be allowed if the following formula is not respected:

DischTemp - TOilPress > 5 °C

Where:

DischTemp is the compressor discharge temperature

TOilPress is the saturated temperature at the oil pressure

6.9. Pumpdown

As a compressor stop request is recorded (and if the request doesn't originate from an alarm), before to proceed, the compressor is fully discharged and operated for a certain amount of time with a closed expansion valve (in the case of electronic expansion valve) or closed liquid line valve (in the case of thermostatic expansion valve).

This operation, known as “pumpdown”, is used to evacuate the evaporator avoiding that in a following restart the compressor will such liquid.

Pumpdown procedure will end after a user defined timer is expired (adjustable, default 30 sec.) or the saturated temperature at the evaporator pressure reaches the value of -10^ (adjustable in the range -12 -4^ (10.4 | 24.8 F)).

After compressor stop the unloading solenoid valve are energized for a time equal to the minimum compressor off time to assure the complete unloading also in case of non-normal stop procedure completion.

6.10. Low ambient temperature start

Units working in cooling, cooling/glycol or ice mode has to manage start-up with low outside ambient temperature

A low OAT start is initiated if, at the compressor start up, the condenser saturated temperature is less than 15.5 ^ (60 F).

Once this happens, 3 seconds after the end compressor startup procedure (end of prepurge cycles) low pressure events are disabled for a time equal to the low OAT time (setpoint has an adjustable range from 20 to 120 seconds, defaults 120 sec.).

The absolute low pressure limit (the threshold which has no time delay) is still enforced. If this limit pressure is reached a Low Ambient Start-Up low pressure alarm is issued.

At the end of the low OAT start, the evaporator pressure is checked. If the pressure is greater than or equal to the evaporator pressure stage down setpoint, the start is considered successful. If the pressure is less than this, the start is not successful and the compressor shall stop. Three start attempts are allowed before tripping on the restart alarm.

The restart counter should be reset when either a start is successful or the circuit is off on an alarm.

6.11. Compressors and unit trips

6.11.1. Unit trips

Unit trips are caused by:

• Low evaporator flow rate

A “Low evaporator flow rate alarm” will trip the whole unit if the evaporator flow switch remains open for more than an adjustable value; the alarm are automatically reset for three times if the evaporator flow switch closes for more than 30 seconds. Starting from the fourth alarm it has to be reset manually.

• Low evaporator outlet temperature

A “Low evaporator outlet temperature alarm” will trip the whole unit as soon as the evaporator leaving water temperature (evaporator leaving temperature in the case of single evaporator units or manifold temperature in the case of a double evaporator unit) falls below the freeze alarm setpoint.

A manual reset of the alarm are required to restart the unit

• Phase-Voltage Monitor (PVM) or Ground Protection (GPF) failure

A “Bad phase/voltage or Ground protection failure alarm” will trip the whole unit as soon as the phase monitor switch opens (if a single phase monitor is used) after the unit start request.

A manual reset of the alarm will required to restart the unit

• Evaporator leaving water temperature fault

An “Evaporator leaving water temperature fault alarm” will trip the whole unit if the reading of evaporator leaving water temperature (evaporator leaving temperature in the case of

single evaporator units or manifold temperature in the case of a double evaporator unit) goes out of probe allowable range for a time longer than ten seconds.

A manual reset of the alarm will required to restart the unit

• External alarm (only if enabled)

A “External alarm” will trip the whole unit as soon as the external alarm switch closes after the unit start request, if the unit trip on external alarm has been set.

A manual reset of the alarm will required to restart the unit

- Probe failure

A “Probe failure” will trip the unit if the reading of one among the following probes goes out of probe allowable range for a time longer than ten seconds.

• Evaporator #1 leaving temperature probe (on 2 evaporators units)
• Evaporator #2 leaving temperature probe (on 2 evaporators units)

The controller display will show the faulted probe identification

6.11.2. Compressors trip

Compressor trips are caused by:

• Mechanical High pressure

A “High pressure switch alarm” will trip the compressor as soon as the high pressure switch opens.

A manual reset of the alarm is required to restart the unit (after the manual reset of the pressure switch).

• High discharge pressure

A “High discharge pressure alarm” will trip the compressor as soon as the compressor discharge pressure exceeds the adjustable high pressure setpoint.

A manual reset of the alarm are required to restart the unit

• High discharge temperature

A “High discharge temperature alarm” will trip the compressor as soon as the compressor discharge temperature exceeds the adjustable high temperature setpoint.

A manual reset of the alarm are required to restart the unit

• Low evaporator outlet temperature

A “Low evaporator outlet temperature alarm” will trip the two compressors connected to the same evaporator in the case of a double evaporator unit as soon as the evaporator leaving water temperature falls below the adjustable freeze threshold.

A manual reset of the alarm are required to restart the unit

• Mechanical Low pressure

A “Low pressure switch alarm” will trip the compressor if the low pressure switch opens for more than 40 seconds during compressor running. Five automatic reset alarms (both from transducers and switches) are managed in all modes (cooling, cooling glycol, ice, heat pump). These alarms switch off the compressor without signalling (alarm relay is not activated). Only the sixth will be a manual reset alarm.

The “Low pressure switch alarm” are disabled during prepurge cycles and during pumpdown.

At compressor startup (after the end of prepurge cycles) the “Low pressure switch alarm” is disabled if a low ambient start has been recognized otherwise are delayed by 120 sec.

A manual reset of the alarm are required to restart the unit

- Low suction pressure

A “Low suction pressure alarm” will trip the compressor if the compressor suction pressure remains below the adjustable low pressure alarm setpoint for a time longer than that listed in the following table.

Low suction pressure alarm delay

Low press setpoint – Suct press(bar / psi)	Alarm delay(seconds)
0.1 / 1.45 160
0.3 / 4.35 140
0.5 / 7.25 100
0.7 / 10.15 80
0.9 / 13.05 40
1.0 / 14.5 0

No delay is introduced if the suction pressure falls below the low pressure alarm setpoint by an amount greater or equal to 1 bar. Five automatic reset alarms (both from transducers and switches) are managed in all modes (cooling, cooling glycol, ice, heat pump). These alarms switch off the compressor without signalling (alarm relay is not activated). Only the sixth will be a manual reset alarm.

The “Low suction pressure alarm” are disabled during prepurge cycles and during pumpdown.

At compressor startup (after the end of prepurge cycles) the “Low suction pressure alarm” are disabled if a low ambient start has been recognized.

A manual reset of the alarm are required to restart the unit

- Low oil pressure

A “Low oil pressure alarm” will trip the compressor if the oil pressure remains below the following thresholds by a time longer than an adjustable value during compressors running and at compressor startup

Suction pressure*1.1 + 1 bar at compressor minimum load

Suction pressure*1.5 + 1 bar at compressor full load

Interpolated values at compressor intermediate load

A manual reset of the alarm are required to restart the unit

• High oil pressure difference

A “High oil pressure difference alarm” will trip the compressor if the difference between the discharge pressure and the oil pressure remains over an adjustable setpoint (default 2.5 bar) by a time longer than an adjustable value

A manual reset of the alarm are required to restart the unit

- Low pressure ratio

A “Low pressure ration alarm” will trip the compressor if the pressure ratio remains below the adjustable threshold at rated compressor load by a time longer than an adjustable value

A manual reset of the alarm are required to restart the unit

• Compressor Startup failure

A “Failed transition or starter alarm” will trip the compressor if the transition/starter switch remains open for more than 10 seconds from compressor start

A manual reset of the alarm are required to restart the unit

• Compressor overload or motor protection

A “Compressor overload alarm” will trip the compressor if the overload switch remains open for more than 5 seconds after the compressor start.

A manual reset of the alarm are required to restart the unit

- Slave board failure

A “Unit xx off-line alarm” will trip slave compressors if the master board cannot communicate with slave boards for a time longer than 30 seconds.

A manual reset of the alarm are required to restart the unit

• Master board failure or network communication

A “Master off-line alarm” will trip the slave compressors if slave board cannot communicate with master board for a time longer than 30 seconds.

- Probe failure

A “Probe failure” will trip the compressor if the reading of one among the following probes goes out of probe allowable range for a time longer than ten seconds.

• Oil Pressure probe
• Low Pressure probe
  – Suction temperature probe
• Discharge Temperature probe
• Discharge Pressure probe

The control display will show the faulted probe identification

• Auxiliaries signal failure

The compressor is tripped if one among the following digital inputs is opened for a timer greater than an adjustable value (default is 10 s).

• Compressor phase monitor or Ground protection failure
• Variable speed driver alarm

6.11.3. Other trips

Other trips may disable particular functions described in the following (e.g. heat recovery trips).

The addition of optional expansion boards will also activate the alarms related to communication with expansion boards and to probes connected to expansion boards.

For units with electronic expansion valve, all the drivers critical alarms will trip the compressors

6.11.4. Unit and compressors alarms and corresponding codes

In the following table the list of the managed alarms for both unit and compressors is shown.

Alarm code	Interface alarm label Details
0 -
1 Phase Alarm	Phase alarm (Unit or Circuit)
2 Freeze Alarm	Freeze alarm
3 Freeze Alarm	EV1 Freeze alarm on Evaporator 1
4 Freeze Alarm	EV2 Freeze alarm on Evaporator 2
5 Pump Alarm	Pump overload
6 Fan Overload	Fan overload
7 OAT Low	Pressure Low press alarm during low OAT start.
8 Low Amb	Start Fail Low OAT start-up failed
9 Unit 1 Offline	Board #1 offline (Master)
10	Unit 2 Offline Board #2 offline (Slave)
11	Evap. Flow Alarm	Evaporator flow switch alarm
12	Probe 9 Error	Inlet temperature probe fault
13	Probe 10 Error	Outlet temperature probe fault
14	- -
15	Prepurge #1 Timeout	Prepurge failed on circuit #1
16	Comp Overload #1	Compressor #1 overload
17	Low Press. Ratio #1	Low Pressure Ratio on circuit #1
18	High Press. Switch #1	High pressure switch alarm on circuit #1
19	High Press. Trans #1	High pressure transducer alarm on circuit #1
20	Low Press. Switch #1	Low pressure switch alarm on circuit #1
21	Low Press. Trans #1	Low pressure transducer alarm on circuit #1
22	High Disch Temp #1	High discharge temperature circuit #1
23	Probe Fault #1	Probes on circuit #1 failure
24	Transition Alarm #1	Transition alarm compressor #1
25	Low Oil Press #1	Low oil pressure on circuit #1
26	High Oil DP Alarm #1	High oil delta pressure alarm on circuit #1
27	Expansion Error	Expansion boards error
28	- -
29	EXV Driver Alarm #1	EXV Driver #1 Alarm
30	EXV Driver Alarm #2	EXV Driver #2 Alarm
31	Restart after PW Loss	Restart after power loss
32	- -
33	- -
34	Prepurge	#2 Timeout Prepurge failed on circuit #2
35	Comp Overload #2 Compressor overload #2
36	Low Press. Ratio #2 Low Pressure Ratio on circuit #2
37	High Press. Switch #2 High pressure switch alarm on circuit #2
38	High Press. Trans #2 High pressure transducer alarm on circuit #2
39	Low Press. Switch #2 Low pressure switch alarm on circuit #2
40	Low Press. Trans #2 Low pressure transducer alarm on circuit #2
41	High Disch Temp #2 High discharge temperature circuit #2
42	Maintenance Comp #2 Maintenance required on compressor #2
43	Probe Fault #2 Probes on circuit #1 failure
44	Transition Alarm #2 Transition alarm compressor #2
45	Low Oil Press #2 Low oil pressure on circuit #1
46	High Oil DP Alarm #2 High oil delta pressure alarm on circuit #1
47	Low Oil Level #2 Low oil level on circuit #2
48		PD #2 Timer Expired Pump down timer expired on circuit #2 (Warning not signalled as alarm condition)
49 -
50 -
51 -
52	Low Oil Level #1 Low oil level on circuit #1
53		PD #1 Timer Expired Pump down timer expired on circuit #1 (Warning not signalled as alarm condition)
54	HR Flow Switch Heat recovery flow switch alarm.

6.12. Economizer valve

If the option is present (expansion board 1) and enabled under manufacturer password, when the compressor's load percentage is greater than an adjustable threshold (default is 90%) and if the saturated condensing temperature is lesser than an adjustable setpoint (default is 65.0°C) the economizer valve is energized. The valve is deenergized if either the compressor's load percentage falls below another adjustable threshold (default is 75%) or if the saturated condensing temperature falls below the setpoint minus an adjustable differential (default is 5.0 °C).

6.13. Switch between cooling and heating mode

Any time the switching of a compressor between cooling (or cooling/glycol or ice) and heating mode is required, either if this is required by unit switching form one mode to other or to start defrost or to end defrost, the following procedures are followed.

6.13.1. Switching from cooling modes to eating mode

6.13.1.1. Compressor running in cooling mode

A compressor running in cooling mode (four-way valve de-energized) is switched off without executing pumpdown, the four-way valve is energized 5 seconds after the compressor has been switched off, than the compressor is switched on after the minimum time compressor off is expired and the standard prepurge procedure is executed.

6.13.1.2. Compressor stopped in cooling mode

If a compressor that was stopped in cooling mode is required to start in heating mode it is switched on in standard cooling mode (with four-way valve de-energized and executing the

standard prepurge procedure), it is kept running for 120 seconds in cooling mode and than is switched off without pumpdown, the four-way valve is energized 5 seconds after the compressor has been switched off, than the compressor is switched on after the minimum time compressor off is expired.

6.13.2. Switching from heating modes to cooling modes

6.13.2.1. Compressor running in heating mode

A compressor running in heating mode (four-way valve energized) is switched off without executing pumpdown, the four-way valve is de-energized 5 seconds after the compressor has been switched off, than the compressor is switched on after the minimum time compressor off is expired and the standard prepurge procedure is executed.

6.13.2.2. Compressor stopped in heating mode

If a compressor that was stopped in heating mode (four-way valve energized) is required to start than then four-way valve is de-energized and the compressor is switched on after the 20 sec.

6.13.3. Additional consideration

The previous procedures relay on the fact that the cooling or heating state is a property of the compressor regardless the fact it is switched on or off. This meanings that, if a compressor is switched of in heating mode its four-way valve remains energized (at the same manner a compressor switched off in cooling mode has the four-way valve de-energized).

If the unit power is removed the four-way valves are automatically de-energized (it is an hardware characteristic of the valves); this meanings that also compressors switched off in heating mode goes in cooling mode. So the heating mode of each compressor is reset if the unit power is removed.

6.14. Defrost procedure

In units configured as heat pumps running in heating mode a defrost procedure are executed.

Two compressors will not execute the defrost procedure at the same time.

A compressor will not execute the defrost procedure unless an adjustable timer (default 30 min) is expired since its startup and will not execute two defrost time before another adjustable timer (default 30 min) is expired (if this is required a warning message are generated).

The defrost procedure are based on the measure of ambient temperature (Ta) and the suction temperature measure by the defrost sensors (Ts). When the Ts remains below Ta by an amount greater than a value, depending from ambient temperature and coil design, for a time longer than an adjustable (default 5 min) value the defrost will start.

The formula to evaluate needs for defrost is:

$$ \mathrm{Ts} < 0. 7 \times \mathrm{Ta} - \Delta \mathrm{T} \& \text { Ssh } < 1 0 ^ {\circ} \mathrm{C} (\text { adjustable value }) $$

Where T is the adjustable coil design approach (default=12°C) and Ssh is the suction superheat.

Defrost procedure will never be executed if Ta > 7 °C (adjustable under maintenance password).

Defrost procedure will never be executed if T_s > 0 ^ (adjustable under maintenance password).

During defrost the circuit are switched in “cooling mode” for an adjustable time (default 10 min) if Ta < 2 °C (adjustable under maintenance password), otherwise the compressor are stopped and fans are kept at maximum speed for another adjustable time (default 15 min).

Defrost procedure are stopped if evaporator outlet temperature fall below a set value or if discharge pressure reaches a set value.

During defrost procedure “Low pressure switch alarm” and “Low suction pressure alarm” are disabled.

If the switch in “cooling mode” is required, it are executed only if the pressure difference between compressor discharge and suction exceeds 4 bar; if this isn’t the compressor are loaded to reach such a condition. After the switching compressor fans are switched off and a pre-purge procedure are executed (at minimum compressor load). After prepurge the compressor are loaded energizing the loading solenoid with an adjustable number of pulse (default 3).

At the end of defrost procedure executed in “cooling mode” compressor are switched off after its complete download without execution of pumpdown; than the 4-way valve are deenergized; than the compressor are available for temperature control system ignoring the start to start timer.

6.15. Liquid injection

Liquid injection in the discharge line is activated both in cooling/ice and heating mode if the discharge temperature exceeds an adjustable value (default 85^ C).

Liquid injection in the suction line are activated, only in heating mode, if the discharge superheat exceeds an adjustable value (default 35^ C).

6.16. Heat Recovery procedure

The heat recovery procedure is available only in units configured as chillers (not available for heat pumps).

The manufacturer will select the circuits equipped with heat recovers.

6.16.1. Recovery pump

When heat recovery is activated the control will start the recovery pump (if the second pump is foreseen the pump with low operating hours is selected, a manual pump sequencing is foreseen); within 30 sec a recovery flow switch must close otherwise and “Recovery Flow Alarm” will rise and the heat recovery function is disabled; the alarm is automatically reset for three times if the evaporator flow switch closes for more than 30 seconds. Starting from the fourth alarm it has to be reset manually.

No recovery circuit must be activated if a flow switch alarm occurs.

In case of a flow switch alarm during recovery circuit operation, the related compressor will trip and the alarm reset will not be allowed up to the flow is recovered (otherwise recover heat exchanger freeze will occur).

6.16.2. Recovery control

When heat recovery is activated the control will activate or deactivate recovery circuits with a step logic.

In particular a next heat recovery stage is activated (a new heat recovery circuit is inserted) if the heat recovery leaving water temperature remains below the setpoint by an amount greater than an adjustable regulation band for a timer greater than an adjustable value (heat recovery interstage). When a recovery stage is requested, the relative compressor is completely downloaded and then the recovery valve is energized. After recovery valve switches the compressor load is inhibited until the saturated condensing temperature is lower than an adjustable threshold (default is 30.0^ C).

At the same manner a heat recovery stage is deactivated (a heat recovery circuit is removed) if the heat recovery leaving water temperature remains above the setpoint by an amount greater than an adjustable dead regulation band for a timer greater than the previous defined value.

An high temperature setpoint is active in the recovery loop; it will disable all recovery circuits at the same time if the heat recovery water temperature rises above an adjustable threshold (default 50.0^ ).

A three-way valve is used to increase recovery water temperature at startup; a proportional control is used to establish valve position; at low temperature the valve will recirculate recovery water, while at temperature increasing the valve will bypass a portion of the flow.

Fig. 14 - Heat recovery interstage

6.17. Compressor limiting

Two levels of limits are included in the control:

- Load inhibit

The load is not allowed; another compressor may start or may be loaded

- Forced unload

The compressor is unloaded; another compressor may start or may be loaded

The parameters that may limit compressors are :

- Suction pressure

The compressor load is inhibited if the suction pressure is lower than a “stage-hold” setpoint

The compressor is unloaded if the suction pressure is lower than a “stage-down” setpoint

- Discharge pressure

The compressor load is inhibited if the discharge pressure is higher than a “stage-hold” setpoint

The compressor is unloaded if the discharge pressure is higher than a “stage-down” setpoint

• Evaporator outlet temperature

The compressor is unloaded if the evaporator outlet temperature is lower than a “stage-down” setpoint

- Discharge Superheat

The compressor load is inhibited if, the discharge superheat is below an adjustable threshold (default 1.0^ C) for an adjustable time (default 30s) from the compressor starts at the end of prepurge procedure.

• Absorbed inverter current

The compressor load is inhibited if, the absorbed inverter current is above an adjustable threshold.

The compressor is unloaded if the absorbed inverter current is above the inhibit threshold of an adjustable percentage.

6.18. Unit limiting

Unit load may be limited by the following inputs:

- Unit current

The unit load is inhibited if the absorbed current is near to a maximum current setpoint (within -5% from setpoint)

The unit is unloaded if the absorbed current is higher than a maximum current setpoint

- Demand limit

The unit load is inhibited if the unit load (measured by slide valve sensors or calculated as described) is near to a maximum load setpoint (within -5% from setpoint)

The unit is unloaded if the unit load is higher than the maximum load setpoint.

The maximum load setpoint may be derived by a 4-20 mA input (4mA → limit=100%; 20 mA → limit=0%); or from a numeric input coming from monitoring system (network demand limit).

- SoftLoad

At unit startup (when the first compressor stats) a temporary demand limit may be set up to a time expired.

6.19. Evaporator pumps

An evaporator pump is foreseen in the base configuration while a second pump is an optional.

When the two pumps are selected, the system will automatically start the pump with lower operating hours each time a pump has to be started. A fixed starting sequence may be set.

A pump is started when the unit is switched on; within 30 sec an evaporator flow switch must close otherwise and “Evaporator Flow Alarm” will rise. The alarm is automatically reset for three times if the evaporator flow switch closes for more than 30 seconds. Starting from the fourth alarm it has to be reset manually.

6.19.1. Inverter pump ^2

Inverter pump is used to modify water flow through the evaporator in order to keep evaporator water T at the rated value (or close to it) even if the required capacity is reduced due to the switching off of some terminals. In fact, in this case the water flow across the remaining ones increases as well as the pressure drops and the head required to the pump.

So the pump speed is reduced to reduce the water pressure drops across terminals at the rated value.

Since a minimum flow through the evaporator is required (about 50% of rated one) as well as inverter pumps may not run at low frequency, a minimum flow bypass is managed.

The flow control is based on the measurement of pressure difference across the pump (pump head) and will act on the pump speed and on the bypass valve position.

Both actions are executed by 0-10V analog output.

In particular, since pressure drops across evaporators and piping change with flow while pressure drops across terminal units are flow-independent, the pump required head (head setpoint) is a function of the flow:

$$ \Delta = (\Delta_ {r} - \Delta P _ {l} h \left(\frac {f}{f _ {r}}\right) ^ {2} \quad P _ {l} $$

being

h = required pump head at the supply frequency f (pump head target)

h_r = pump head at rated flow (pump head setpoint)

P_t = terminal units pressure drop at rated flow

f = pump required supply frequency

$$ f _ {r} = \text { pump supply frequency at rated flow } $$

A tuning procedure is available to allow the setting of h_r .

This procedure has to be activated with unit on, both compressors running at 100% and all terminal units on. When this procedure is active the pump speed may be adjusted manually from 70% to 100% (35 to 50Hz) and the they bypass valve is completely close (0V output) and the evaporator water T is shown. When the operator, changing the pump speed reaches the right water T will stop the setup procedure and the pump head is chosen as h_r (head setpoint).

If the setup procedure has not been executed the system will work with 100% pump speed and bypass valve completely closed and a “No pump VFD calibration alarm” will rise (delayed by 30 minutes) without stopping the unit.

During the operation a PID controller acts on the pump speed to keep the pump head to the target value h (reducing the speed as well as the head increases) and keeping the bypass valve completely close; the PID controller will never reduce the pump speed below 75% (35Hz) since this is the operating limit of inverter pump, if this set is reached and the head continues to increase a PID controller will start to open the bypass valve.

The reverse occurs when pump head decreases; the controller will start to close the valve and when it is completely closed it will start to speed-up the pump.

Pump speed and bypass valve will never move together (to avoid flow instability); pump will be adjusted from 100% to minim flow, valve will be used when required flow is below the minimum.

At the unit startup the pump will start at minimum frequency (35 Hz) and will accelerate up to 50 Hz in 10 sec. while the bypass valve is completely open (100% output).

Then it will start to regulate pump head accordingly to the previous procedure; the compressors start will be enabled once the target pump head is reached (within a 10% tolerance).

6.20. Fans control

Fans control is used to manage condensation pressure in cooling, cooling glycol or ice mode and evaporating pressure in heating mode.

In both cases the fans may be managed to control:

• Condensation or evaporation pressure,
- Pressure ratio,
• Pressure difference between condensation and evaporation.

Four control methods are available:

• Fantroll,
• Fan Modular,
  • Variable speed driver,
• Speedtroll.

6.20.1. Fantroll

A step control is used; fan steps are activated or deactivated to keep compressor operating conditions within the allowed envelope.

Fan steps are activated or deactivated keeping condensing (or evaporating pressure) change to a minimum; to do this one next fan is started or stopped at time.

Fans are connected to steps (digital outputs) according to the scheme in table below

Fans connection to steps

Fan steps are activated or deactivated on the base of the staging table below

Steps staging

Stage

2

3

4

N° of fans per circuit

5

6

7

8

9

1

1

1

1

1

1

1

1

1

1

Active step

2

1+2

1+2

1+2

1+2

1+2

1+2

1+2

1+2

1+2

1+2

1+2

3

1+2+3

1+3

1+3

1+3

1+3

1+3

1+3

1+3

1+3

1+3

4

1+2+3

1+2+3

1+2+3

1+2+3

1+2+3

1+2+3

1+2+3

1+2+3

1+2+3

5

1+2+3+4

1+3+4

1+3+4

1+3+4

1+3+4

1+3+4

1+3+4

1+3+4

6

1+2+3+4

1+2+3+4

1+2+3+4

1+2+3+4

1+2+3+4

1+2+3+4

1+2+3+4

7

1+2+3+4+5

1+3+4+5

1+2+3+4+5

1+2+3+4+5

1+2+3+4+5

8

1+2+3+4+5

1+3+4+5

1+3+4+5

9

1+2+3+4+5

1+2+3+4+5

6.20.1.1. Fanroll in cooling mode

6.20.1.1.1. Control of condensing pressure

A stage up is executed (the next stage is activated) if the condensing saturated temperature (saturated temperature at discharge pressure) exceeds the target setpoint (default 43.3 °C (110 F)) by an amount equal to a stage up dead band by a time depending by the difference between the reached values and the target setpoint plus stage up dead band (high condensing temperature error).

In particular the stage up is executed when the integral of the high condensing temperature error reaches the value 50 ^ x sec (90 Fxsec).

At the same manner a stage down is executed (the previous stage is activated) if the condensing saturated temperature falls below the target setpoint by an amount equal to a stage down dead band by a time depending by the difference between the reached the target setpoint minus the stage down dead band values and the reached value (low condensing temperature error).

In particular the stage down is executed when the integral of the low condensing temperature error reaches the value 14 ^ (25.2 Fxsec).

The condensing temperature error integral is reset to zero when condensing temperature is within the deadband or a new stage is activated.

Each fan stage will have its own adjustable stage up (default 4.5 °C (8.1F)) and stage down (default 6.0 °C (10.8 F)) deadband.

6.20.1.1.2. Control of pressure ratio

The control will operate to keep pressure ratio equal to a target adjustable value (default 2.8)

A stage up is executed (the next stage is activated) if the pressure ratio exceeds the target pressure ratio by an amount equal to an adjustable stage up dead band by a time depending by the difference between the reached values and the target value plus stage up dead band (high pressure ratio error).

In particular the stage up is executed when the integral of the pressure ratio error reaches the value 25 sec.

At the same manner a stage down is executed (the previous stage is activated) if the pressure ratio falls below the target setpoint by an amount equal to a stage down dead band depending by the difference between the target setpoint minus the stage down dead band values and the reached value (low pressure ratio error).

In particular the stage down is executed when the integral of the low pressure ratio error reaches the value 10 sec.

The pressure ratio error integral is reset to zero when condensing temperature is within the deadband or a new stage is activated.

Each fan stage will have its own adjustable stage up (default 0.2) and stage down (default 0.2) deadband.

6.20.1.1.3. Control of temperature difference

The control will operate to keep difference between the condensing temperature (saturated temperature at discharge pressure) and evaporating temperature (saturated temperature at suction pressure) equal to an adjustable target value (default 40^ C (72 F)).

A stage up is executed (the next stage is activated) if the pressure difference exceeds the target pressure difference by an amount equal to an adjustable stage up dead band by a time depending by the difference between the reached values and the target value plus a stage up dead band (high pressure difference error).

In particular the stage up is executed when the integral of the pressure difference error reaches the value 50 ^ x sec (90 Fxsec).

At the same manner a stage down is executed (the previous stage is activated) if the pressure difference falls below the target setpoint by an amount equal to a stage down dead band depending by the difference between the target setpoint minus the stage down dead band values and the reached value (low pressure difference error).

In particular the stage down is executed when the integral of the low pressure ratio error reaches the value 14 ^ x sec (25.2 Fxsec).

The pressure ratio error integral is reset to zero when condensing temperature is within the deadband or a new stage is activated.

Each fan stage will have its own adjustable stage up (default 4.5 °C (8.1F)) and stage down (default 6.0 °C (10.8 F)) deadband.

6.20.1.2. Fan troll in heating mode

6.20.1.2.1. Control of evaporation pressure

A stage up is executed (the next stage is activated) if the evaporating saturated temperature (saturated temperature at suction pressure) is below the target setpoint (default 0 ^ (32 F)) by an amount equal to a stage up dead band by a time depending by the difference between the reached values and the target setpoint plus stage up dead band (high condensing temperature error).

In particular the stage up is executed when the integral of the high condensing temperature error reaches the value 50 ^ x sec (90 F x sec).

At the same manner a stage down is executed (the previous stage is activated) if the evaporating saturated temperature exceeds the target setpoint by an amount equal to a stage down dead band by a time depending by the difference between the reached the target setpoint minus the stage down dead band values and the reached value (low condensing temperature error).

In particular the stage down is executed when the integral of the low condensing temperature error reaches the value 14 ^ x sec (25.2 Fxsec).

The condensing temperature error integral is reset to zero when condensing temperature is within the deadband or a new stage is activated.

Each fan stage will have its own adjustable stage up (default 3 °C (5.4F)) and stage down (default 3 °C (5.4 F)) deadband.

6.2.1.1.1. Control of pressure ratio

The control will operate to keep pressure ratio equal to a target adjustable value (default 3.5)

A stage up is executed (the next stage is activated) if the pressure ratio exceeds the target pressure ratio by an amount equal to an adjustable stage up dead band by a time depending by the difference between the reached values and the target value plus stage up dead band (high pressure ratio error).

In particular the stage up is executed when the integral of the pressure ratio error reaches the value 25 sec.

At the same manner a stage down is executed (the previous stage is activated) if the pressure ratio falls below the target setpoint by an amount equal to a stage down dead band depending by the difference between the target setpoint minus the stage down dead band values and the reached value (low pressure ratio error).

In particular the stage down is executed when the integral of the low pressure ratio error reaches the value 10 sec.

The pressure ratio error integral is reset to zero when condensing temperature is within the deadband or a new stage is activated.

Each fan stage will have its own adjustable stage up (default 0.2) and stage down (default 0.2) deadband.

6.2.1.1.2. Control of temperature difference

The control will operate to keep difference between the condensing temperature (saturated temperature at discharge pressure) and evaporating temperature (saturated temperature at suction pressure) equal to an adjustable target value (default 50^ C (90 F))

A stage up is executed (the next stage is activated) if the pressure difference exceeds the target pressure difference by an amount equal to an adjustable stage up dead band by a time depending by the difference between the reached values and the target value plus a stage up dead band (high pressure difference error).

In particular the stage up is executed when the integral of the pressure difference error reaches the value 50 ^ x sec (90 Fxsec).

At the same manner a stage down is executed (the previous stage is activated) if the pressure difference falls below the target setpoint by an amount equal to a stage down dead band depending by the difference between the target setpoint minus the stage down dead band values and the reached value (low pressure difference error).

In particular the stage down is executed when the integral of the low pressure ratio error reaches the value 14 ^ x sec (25.2 Fxsec)..

The pressure ratio error integral is reset to zero when condensing temperature is within the deadband.

6.20.2. Fan Modular

The Fan Modular method will work at the same way of Fantroll method (staging sequence), but instead of using digital outputs, it will use and analog output.

In particular the analog output will assume a value, in volts, equal to the stage number (at stage 2, 2V is output, at stage 3, 3V and so on).

6.20.3. Variable Speed Driver

A continuous control is used; fans speed is modulated to keep saturated condensation pressure at a setpoint; a PID control is used to allow a stable operation.

A Fan Silent Mode function (FSM) is implemented on unit with Variable Speed Driver (VSD) to keep fan speed below a set value during some periods.

6.2.1.2. VSD in cooling, cooling glycol or ice mode

When the system is operating in cooling mode, either if it is controlling the condensation pressure, the pressure ratio or the pressure difference, the PID proportional gain is positive (the higher the input the higher the output).

Fig. 15 - Proportional action of VSD PID in cooling/iced mode

6.2.1.3. VSD in heating mode

6.2.1.3.1. Control of evaporation temperature

When the system is operating in heating mode to control the evaporation temperature the proportional gain is negative (the higher the input the lower the output).

Fig. 16 - Proportional action of VSD PID in heating mode

6.2.1.3.2. Control of pressure ratio or temperature differences

When the system is operating in heating mode to control the pressure ration the proportional gain is positive (the higher the input the higher the output).

6.20.4. Speedtroll

A mixed step-VSD control are used; the first fans step are managed using a VSD (with related PID control), next steps are activated as in the step control, only if the cumulated stage-up and stage-down error is reached and the VSD output is at maximum or minimum respectively.

6.20.5. Double VSD

Two VSD are managed to keep controlled parameter at a setpoint; the second VSD are activated when the first one reaches the maximum speed and the PID control requires greater air flow

6.20.6. Fans control at startup in heating mode

At the compressors start in heating mode fans are started before that the compressors begin their normal start up sequence if the outside ambient temperature is below a fixed temperature of 10.0^ C (50.0F). If the condensation control is either speedtroll or fantroll each step is activated after a fixed delay of 6 seconds. The control is released to automatic control if the outside ambient temperature is greater than a fixed threshold of 15.0^ C (59.0F).

6.21. Other functions

The following functions are implemented.

6.21.1. Hot Chilled Water Start

This feature will allow the unit startup also in case of high evaporator outlet water temperature.

It will not allow the compressors loading above an adjustable percentage until the evaporator leaving water temperature falls below an adjustable threshold; another compressor is enabled to start when the others are limited.

6.21.2. Fan Silent Mode

This feature will allow to reduce unit noise limiting fans speed (only in case of VSD fan control) on the base of a time schedule. A maximum output voltage for the VSD could be set for FSM operations (default value 6.0V).

6.21.3. Double evaporator units

This feature will allow to limit freezing problems on units with two evaporators (3 and 4 compressors units).

In this case compressors are started alternatively on the two evaporators.

7. UNIT AND COMPRESSORS STATUS

In the following tables it will be possible to find all the configured unit and compressors status with some details explaining the status.

Status code	Interface status label Explanation
0	- Not reachable.
1	Off Alarm Unit is off due to a unit alarm.
2	Off Rem Comm Unit is off from Remote Supervisor.
3	Off Time Schedule Unit is off due to time schedule.
4	Off Remote Sw Unit is off from remote switch.
5	Pwr Loss Enter Start Power failure. Press Enter button to start the Unit.
6	Off Amb. Lockout Unit is off due to external temperature below ambient lockout threshold.
7	Waiting Flow Unit is verifying the flow switch status before temperature control start.
8	Waiting Load Waiting for thermal load on water circuit.
9	No Comp Available No compressor available (both off or in conditions that inhibits their start).
10	FSM Operation Unit is working in Fan Silent Mode.
11	Off Local Sw Unit is off from local switch.
12	Off Cool/Heat Switch Unit is in idle after a Cool/Heat switch.

Tab. 15 - Unit status

Status code	Interface status label Explanation
0	- Not reachable.
1	Off Alarm Compressor is off due to unit alarm.
2	Off Ready Compressor is ready but the Unit is off.
3	Off Ready
4	Off Ready
5	Off Ready
6	Off Ready
7	Off Switch	Compressor is off from switch.
8	Auto %	Automatic compressor load management.
9	Manual %	Manual compressor load management.
10	Oil Heating	Compressor is off due to Oil Heating.
11	Ready	Compressor is ready to start.
12	Recycle Time	Compressor is waiting for safety timers to expire before it could be kicked again.
13	Manual Off	Compressor is off from terminal.
14	Prepurge	Compressor is in pre-emptying evaporator before it could be automatically managed.
15	Pumping Down	Compressor is pre-emptying the evaporator before shut-down.
16	Downloading	Compressor is reaching its minimum load percentage.
17	Starting Compressor is starting.
18	Low Disch SH Discharge superheat is lower than a adjustable threshold
19	Defrost Compressor is in defrosting procedure.
20	Auto % Automatic compressor load management (Inverter).
21	Max VFD Load Maximum absorbed current reached compressor cannot load.
22	Off Rem SV Compressor is off from Remote Supervisor.

Tab. 16 - Compressors status

8. START-UP SEQUENCE

8.1. Unit start-up and shut-down flowcharts

Unit startup and shutdown will follow the sequence shown in fig. 16 and 17

graph TD
    A["Unit Start"] --> B["Evapot pump start"]
    B --> C["Evapot flow switch consensus within timer expiration"]
    C -->|No| D["Unit Trip"]
    C -->|Yes| E["Temperature control start"]
    E --> F["Temperature control stabilization"]
    F --> G["Compressors start enabled"]
    G --> H["Control requires unit loading"]
    G --> I["Control requires unit standby"]
    G --> J["Control requires unit unloading"]
    H --> K["New Compressor start required (see landing listing)"]
    K -->|No| L["Compressors loading"]
    K -->|Yes| M["New Compressors selection"]
    M --> N["Compressor line contactor closing"]
    N --> O["Transition confirmation within 10 sec"]
    O -->|No| P["Compressor Trip"]
    O -->|Yes| Q["Compressor complete unloading"]
    Q --> R["Prepurge procedure"]
    R --> S["Pressure ratio exceeds minimum load limit"]
    S -->|No| T["Alarm delay timer expired"]
    S -->|Yes| U["Compressor enabled to load"]
    T --> V["Compressor Trip"]
    U --> W["Compressor Trip"]
    I --> X["Compressor stop required (see unloading listing)"]
    X --> Y["Compressor complete unloading"]
    Y --> Z["Pumpdown procedure"]
    Z --> AA["Compressor line contactor opening"]
    AA --> AB["Compressors unloading"]

Fig. 17 - Unit startup sequence

graph TD
    A["Unit Stop"] --> B["Compressors shutdown procedure"]
    B --> C["Evap flow switch open within timer expiration"]
    C -->|Yes| D["Unit Trip"]
    C -->|No| E["Unit Off"]

Fig. 18 - Unit shutdown sequence

8.2. Heat recovery start-up and shut-down flowcharts

Unit startup and shutdown will follow the sequence shown in fig. 18 and 19

graph TD
    A["Heat recovery activation"] --> B["Heat recovery pump start"]
    B --> C["Recovery flow switch consensus within timer expiration"]
    C -->|Yes| D["HR temperature control start"]
    C -->|No| E["HR Trip"]
    D --> F["HR temperature control stabilization"]
    F --> G["HR circuits activation enabled"]
    G --> H["HR leaving temperature above limit"]
    H -->|Yes| I["HR 3Way valve complete opening"]
    H -->|No| J["HR 3Way valve modulating"]
    I --> K["Control requires loading"]
    I --> L["Control requires standby"]
    K --> M["Loading interstage timer expired (PID calculation)"]
    L --> N["System standby"]
    M --> O["New circuit activation"]
    N --> P["Control requires unloading"]
    P --> Q["Unloading interstage timer expired (PID calculation)"]
    Q --> R["Last circuit deactivation"]
    O --> S["No"]
    P --> T["No"]

Fig. 19 - Heat recovery startup sequence

graph TD
    A["Heat Recovery Stop"] --> B["Circuits deactivation procedure"]
    B --> C["3Way valve opening"]
    C --> D["Evap flow switch open within timer expiration"]
    D -->|Yes| E["HR Trip"]
    D -->|No| F["Haet Recovery Off"]

Fig. 20 - Heat recovery shutdown sequence

9. USER INTERFACE

Two types of user interface are implemented in the software: built-in display and PGD; the PGD display is used as optional remote display.

Both interfaces have a 4x20 LCD display and a 6 keys keypad.

Fig 21 - Built-In Display

In particular, from the main menu, that may be accessed using ☐ (MENU key), 4 different menu sections are addressable. Each section may be accessed using the related key:

(ENTER key) is used to access the Unit status loop from every menu mask.

(LEFT key) access the section listed on the first row of the list

(RIGTH key) access the section listed on the second row of the list

(UP key) access the section listed on the third row of the list

(DOWN key) access the section listed on the fourth row of the list

graph LR
    A["..."] --> B["< ALARM"]
    A --> C["< VIEW"]
    A --> D["< SET"]
    B --> E["←"]
    C --> F["↓"]
    D --> G["↑"]
    E --> H["→"]
    F --> I["←"]
    G --> J["→"]

graph TD
    A["ALARM"] --> B["VIEW"]
    B --> C["SET"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333

Fig 23 - Built-In & PGD navigation

In case of different key labels (this may happen if a standard Carel controller is used instead of one with personalized keypad) please refer to key position to access the same function.

Entering any other section different menus or mask loops are shown.

From every loop with MENU key it is possible to access the father menu and so on until main menu is reached.

In each loop horizontal navigation have been introduced. Using LEFT and RIGHT keys it is possible to move between masks of similar usage (i.e. from View Unit loop is possible to move to View Compressor #1 loop; from Unit Configuration loop is possible to move to Unit Setpoint loop and so on, refer to Masks Tree).

In a mask with different I/O fields, with ENTER key is possible to access the first one, then with UP and DOWN it is possible to increase and decrease respectively the value, with LEFT it is possible to reload the default value and with RIGHT it is possible to skip leaving the value unchanged.

The possibility of change values is subordinated to passwords of different levels depending on the sensibility of the value.

When a password is active, pressing UP+DOWN it is possible to reset all passwords (to make the access to protected values not accessible anymore without the re-insertion of the password).

In any main loops it is possible to change the password for the corresponding level (Unit Config for Tech password, User Setpoint for Operator password and Maint Setpoint for Manager password).

9.1. Mask tree

In fig 22 the structure of the mask tree beginning from the main menu is shown.

In violet the loop horizontally linked are shown.

graph TD
    A["Main Menu"] --> B["Alarms"]
    A --> C["Active"]
    B --> D["View"]
    B --> E["Settings"]
    B --> F["Maint"]
    C --> G["Log"]
    G --> H["Compressors"]
    H --> I["Unit"]
    H --> J["I/O"]
    H --> K["Compressor"]
    K --> L["Unit"]
    K --> M["User"]
    K --> N["Alarm Lims"]
    N --> O["View"]
    N --> P["Settings"]
    N --> Q["Debug"]
    H --> R["Compr. #1"]
    H --> S["Compr. #2"]
    H --> T["Status"]
    H --> U["Water"]
    H --> V["Evap"]
    H --> W["Board"]
    H --> X["Expansion"]
    W --> Y["Compressor"]
    Y --> Z["Setpoints"]
    Y --> AA["Condensation"]
    Y --> AB["Configuration"]
    Y --> AC["Valve Drv"]
    Y --> AD["Alarm Lims"]
    W --> AE["Setpoints"]
    AE --> AF["Time Sched."]
    AE --> AG["FSM Time Sched."]

Fig 24 - Mask tree

9.1.1. Details on Human Machine Interface structure

The HMI of the ASDU01C was developed trying to optimize its usability. This is the reason why masks loops of the same group of parameters could be accessed using left and right arrows creating also horizontal loops.

Parameters within a same horizontal loop could accessed with a unique password.

The structure of the interface assumes the layout of the following figure 24.

graph TD
    A["View Unit"] <--> B["View Compressor #1"]
    B <--> C["View Compressor #2"]
    C <--> D["View water"]
    D <--> E["View evaporator"]
    F["Unit Configuration"] --> G["Unit Setpoints"]
    G --> H["Unit Condensation"]
    H --> I["Compressor Setpoints"]
    I --> J["Unit Valve Driver"]
    K["User Setpoint"] --> L["User FSM Schedule"]
    L --> M["User Time Schedule"]
    M --> N["User Clock"]
    O["Maintenance View"] <--> P["Maintenance Settings"]
    P --> Q["Maintenance Debug"]
    R["Alarm Log"] --> S["Alarm Log"]

Fig 25 - HMI structure

All loops could be accessed directly from the main menu. Once in the selected loop the other loops, with the same colour in the previous scheme, could be reached with left and right arrows. This will mean for example that from the loop Unit Configuration it will be possible to move to Unit Setpoint pressing the right arrow.

Loops with no link with other loops could be accessed only from the menu.

9.2. Languages

User interface are Multilanguage; the user may select the language to be used.

The following language must be implemented in the base configuration ^3 :

• English
• Italian
• French
• German
• Spanish

Chinese language are implemented on additional display (semi-graphic display)

9.3. Units

The interface is able to work using SI and Imperial units.

In the SI system the following units are used:

Pressure : bar

Temperature : °C

Time : sec

In the Imperial system the following units are used:

Pressure : psi

Temperature : °F

Time : sec

As far as pressure is concerning, the interface shows if shown data are gauge or absolute using the postfix “g” or “a” respectively.

9.4. Default passwords

Several levels of passwords for each subsection are available. Subsections are listed in the table below.

Section Password
Super User Daikin Use Only
Technician Authorized Personnel can Contact Factory
Operator 0100

Menu Section	Subsection	Mask Parameter Value Notes
SETTINGS	UNIT	CONFIGURATION	Expansion valve	Expansion valve Electronic or Thermostatic	If electronic driver menu on
			Gas Type R134a
			Unit config	N. of comps 2
				N. of pump 2 Only if pCO	#3 is present
			Condensation fans number	Circuit #1 2 or 3 or 4 Real number of fans
				Circuit #2 2 or 3 or 4
			Low Press Transd limits	Min	-0.5 barg Only with thermostatic expansion valve on
				Max	7.0 barg
			Condensation	Control var.	Press PR not in use
				Type	Fantroll LN andd XN units
					VSD XXN units or optional
					SPEDTROLL When specified
					DOUBLE VSD When specified Not in use
				Update values	Y When values are changed
			Oil heating	Enable Y
			RS485 Net	time check	30 Y only if expansion boards are changed
				Refresh	N Exp Board 2 On
			Exp Board 2 Heat Recovery	Hr circuit recovery	C #1 N/Y C # 2 N/Y Recovery Type; tot / part
			Economizer	Enabled	Y (optional) Only on units with Economizer and expansion board 1
			Econ Settings	Econ thr	65°C Only on units with Economizer
				Econ diff	5 °C
				Econ On	90%
				Econ Off	75%
			Supervisory	Remote on/off	N
			Autorestart	Autorestart after power fail	Y
			Switch off	Switch off on ext alarm	N
			Communication	Communication	Supervisor
			Reset values	Reset all values to default	N Change to Y when replacing software/board
			Password Technician
SETTINGS	UNIT	SETPOINTS	Temperature regulation	Derivative time	60 s
			Prepurge	N. of prepurge cycles	1 When thermostatic valve
				Prep on time	2s
				Evap T Thr - 10 °C
			Prepurge	Prepurge time-out	120 s
				Downloading time	10 s
			Pumpdow config	Enable Y
				Max Time	30 s
				Min Press	1 bar
			Main pump	Off delay	180 s
			Liquid injection	LI Disc setp 85 °C
				LI Disc diff	10 °C
				LI Suct setp	035.0°C
				LI Suct diff	005.0°C Only in heating mode Only in heating mode
			Low ambient startup	Cond. Sat. T	-5.0 °C

SETTINGS
UNIT		CONDENSATION
VALVE DRIVER(Only Units with EEXV)		L.Amb.Timer	180 s
		Heat Rec. Param	02.0°C
		Dead Band	045 s
		Stage Time	030.0°C
		Cond T. thr	02 min
		HR Interstage	040.0°C
		HR Bypass Valve	030.0°C
		Max Temp.	02 min
		Pause Time	02 min
		Min Temp.	02 min
		Max Temp.	02 min
SETTINGS		Setpoint Setpoint 40.0 °C
		FanTroll setpoint	Stage UP Err 10 °Cs
		FanTroll dead band	Stage DW Err 10 °Cs
		n. 1	Stage up See fantoll table
		FanTroll dead band	Stage down
		n. 2	Stage down
		FanTroll dead band	Stage down
		n. 3	Stage down
		FanTroll dead band	Stage down
		n. 4	Stage down
		Inverter config (only for VSD, SpeedTroll or Double VSD config)	Max speed
			Min speed 0.0V units
			Speed up time 00s
		Cond regulation (only for VSD, SpeedTroll or Double VSD config)	Reg. Band 20 °C Speedtroll
			Neutral Band 1 °C
			Integral time 150 s
		Preopening	001 s
		EXV Settings #1	Valve Preopening
		EXV Settings #2	Warning
		EXV Settings #2	Warning
		EXV Settings #1	Act. Pos.
			Man. Posiz 0500
			En. EXV Man
		Valve Type	Act. Pos.
			Man. Posiz 0500
			En. EXV Man
		Settings	Opening
			Extrasteps
			Closing
			Extrasteps
		Settings	Proportional factor
			Integral factor
			Differential factor
		Low SH protection setpoint	-2.0 °C
			0 sec
		Low SH protection integral time	-30 °C
		LOP setpoint	0 sec
		MOP setpoint	12 °C
		MOP integral time	4 sec

			Settings	MOP startup delay	180 sec
			Settings	High Cond temp protection setpoint	90 °C
				High Cond temp protection Integral time	4 sec
			Settings	Suction temperature High limit	60 °C
			Pressure probe #1 settings	Min -0.5 bar
				Max 7.0 bar
			Pressure probe #2 settings	Min -0.5 bar
				Max 7.0 bar
			EXV settings #1	Battery present Y
				pLan present Y Output only
			EXV settings #2	Battery present Y
				pLan present Y Output only
SETTINGS	COMPRESSOR		Timing	Min T same comp starts	600 s
				Min time diff comp starts	120 s
			Timing	Min time comp on	30 s
				Min time comp off	180 s
			Timing Interstage time 120 s
			Press prot	Evap T hold -4.0 °C
				Evap T down -8.0 °C
				Down delay	020s
			High pressure	Hold T.	060.0 °C
				Down T.	065.0 °C
			Dish SH prot	Disc. SH thr 1 °C
				Disc SH Time	30 s
			Comp Loading/unloading	N load Pulse	6	Check on commissioning
				N unload Pulse 9	Check on commissioning
			Loading	Pulse time	0.2 s	Modify if necessary
				Min pulse period	30 s
				Max pulse period	150 s
			Unloading	Pulse time	0.4 s	Modify if necessary
				Min pulse period	1 s
				Max pulse period	150 s
			First pulse timing	Loading	1 s
				Unloading	0.8 s
SETTINGS	USER	Setpoints	Setpoints	Cooling setpoint	as required
			Double setpoint	Enabled	N
			Double setpoint	Cooling double setpoint	as required	Only if double setpoint enabled
			LWT reset	Ldg water temp setpoint reset	As required	Return, 4-20ma, OAT
			Heat Recovery	Setpoint	0045.0°C	Only heating mode
			Working mode	Working mode Cooling
			Softload	Enable Softload	N
			Demand limit	Enable supervisory demand limit	N
			Sequencing	Comp sequence	AUTO
			Supervisor	Protocol	LOCAL
				Comm Speed 19200
				Ident	001
			Units	Interface Units SI
				Supervisory units	SI
			Language	Choose language	English	Italian on separate file
			Passwords	Change passwords
SETTINGS	USER	Time Sch	Enable Enable Time Sch N
SETTINGS	USER	FSM	Enable	Enable Fan Silent ModeMax Inv. Out.	N06.0 v
SETTINGS	USER	Clock	Settings Set Clock
SETTINGS	ALARMS		AntiFreeze AlarmFreeze Prevent	Setpoint 2.0°C
				DiffSetpoint Diff.	1.4°C03.5 °C01.0 °C
			Oil Low pressure alarm delay	Startup delay 300 s
				Run delay 90 s
			Saturated disch temperature alarm	Setpoint 68.5 °CDiff 12.0 °C
			Saturated suction temperature alarm	Setpoint -10.0 °CDiff 2.0 °C
			Oil Press Diff.	Alarm Setp	2.5 bar
			Phase monitor type	PVM or GPF type	Unit
			Evap flow switch alarm delay	Startup delay 20 s
			HR high water Temp. alarm	Run delayThreshold	5 s050.0°C	Only heating mode
			Hr Flow switch Alarm delays	Start up delayRunning Delay	020 s005 s
MAINT	SETTING		Evap pump h. counter	Thresh	010x1000
				Reset	N
				Adjust		Current running hours
			Comp h. counter #1	Thresh	010x1000
				Reset	N
				Adjust		Current running hours
			Comp starts counter #1	Reset	N
				Adjust		Current running Starts
			Comp h. counter #2	Thresh	010x1000
				Reset	N
				Adjust		Current running hours
			Comp starts counter #2	Reset	N
				Adjust		Current running Starts
			Temp Regulation	Regul. Band	3.0 °C
				Neutr. Band	0.2 °C
				Max Pull Down rate	0.7 °C/min	For low inertia plants. It may be increased for high inertia plants
			StartUp/Shutdown	StartUp DT	2.6 °C
				Shutdown DT	1.5 °C	Relate to set-point
			High CLWT start	LWT	25 °C
				Max Comp Stage	70%
			Load management	Min load	40%
				Max load	100%
				En slides valve	N
			ChLWT limits	Low 4.0 °CCooling Mode
					-6.7 °C	Cooling/glycol or Ice mode
				high	15 °C
			Probes enable			Refer to wiring diagram
			Input probe offset			Depending on actual readings
			DT reload	Dt to reload comp	0.7 °C
			Reset Alarm Buffer	Reset	N
			Change password

Fantroll settings
		2 Fans circuit 3 Fans	circuit 4 Fan Circuit
FanTroll dead band n. 1 Stage Up 3 °C 3 °C 3 °C
FanTroll dead band n. 2 Stage Up 15 °C		6 °C 5 °C
FanTroll dead band n. 3 Stage Up			10 °C 8 °C
FanTroll dead band n. 4 Stage Up				10 °C

When speedtroll, do not consider the FanTroll Dead Band 1

APPENDIX B: SOFTWARE UPLOAD TO THE CONTROLLER

It is possible to upload the software into the controller using two different ways: using the direct download form a personal computer or using the Carel programming key.

B.1. Direct upload from PC

To upload the program, it is necessary:

- To install in the PC the program Winload supplied by Carel and available on the web site ksa.carel.com. It may also be required to Daikin.

- to connect the PC, by means of a RS232 serial cable, to the Carel RS232/RS485 adapter (code 98C425C001)

- to connect the RS485 adapter port to the controller terminal port (J10) using a 6 wire phone cable (terminal cable)

- to disconnect the controller from pLAN and to set the net address to 0.

- Switch on the controller and run Winload, select the correct serial port numer you are using and wait (some tenths of seconds) for the "ON LINE" status (this meanings the program is connected to the controller).

- Then select the "Upload" folder and the "Application" section and select al program files supplied by Daikin (one file in the "blb files" box and one or more files in the "iup files" box).

- Then press the “Upload” button and wait the transfer is completed; the program shows all transfer phase in a window and when the process is completed the “UPLOAD COMPLETED” message will appear.

- Finally turn off the controller, disconnect it from the PC, reconnect the pLAN and set the right net address.

This procedure has to be applied to all controllers on the unit with the exception of pCO ^e boards and EEXV drivers.

WinLoad32 Rel. 3.3 File Editors Upload Download System Information Hardware Information Application Bios Boot Public Variables Log Project C:\Controllers Carel ALS_NewDrv_10_F Lan backup Global c: [hpnotebook] iup files MscEN.iup blue files ALS-WHS 10_10 ALS-WHS 10_10 ALS-WHS 10_10 ALS-WHS 10_10 Eprom5.bin net128.bin NETM128BIN dev files enable enable enable Upload Serial Port 1 pCO address 0 OFF LINE

Fig 26 - WinLoad view

B.2. Upload from programming key

To upload the program using the Carel programming key it is necessary first to upload the program to the key and then to download it on one ore more controllers. The same procedure has to be used for both operations just selecting the right position on the key commuter:

Commuter position	Transfer type
1 (green light) key programming from pCO ^3
2 (red light) pCO ^3 programming from key

The procedure is described in the following.

– disconnect the controller from pLAN and to set the net address to 0
- select the right commuter position
- insert the key in the “expansion memory” connection (remove the cover if necessary)
- press "up" and "down" keys at the same time and switch on the controller
- press "enter" key to confirm the operation
- wait until the controller boot
- turn off the controller
- remove the key.

In the case no controller with the program installed is available, the key may be programmed using the same procedure described for the direct upload from a PC. In this case, with the key inserted in the controller and the commuter in position 2 (red light) the program will write on the key instead of on the controller.

APPENDIX C: PLAN SETTINGS

Such work must be made in case a terminal is added in the pLan or if settings are changed.

1. Keep pressed for at least 10 seconds the keys "Up", "Down" and "Enter"

Control panel interface with icons and a vertical navigation bar, showing function buttons and directional arrows

1. A screen will appear with the terminal address and with the address of the board in examination

Terminal Adr: 7

I/O Board Adr: n

Using the “Up” and “Down” keys is it possible choose the different board (1, 2, 3, 4 for the compressors and 5, 7, 9, 11 for the electronic valve drivers)

Select in correspondence of “I/O Board Adr” the number 1 (Board with address 1) and push “Enter”. In about two seconds the following screen will appear:

Terminal Config

Press ENTER

To continue

1. Push "Enter" again; the following screen will appear:

P:01 Adr Priv/Shared

Trm1 7 Sh

Trm2 None --

Trm3 None -- Ok? No

1. If you had to add a second terminal (remote terminal), change the line “Trm2 None – “with the line “Tmr2 17 sh”. To enable the new configuration put the pointer on “No” (using the key “Enter”) and with “Up” and “Down” change it in “Yes” and push “Enter”. The operations from 1. to 3. must be repeated for all the compressor boards (“I/O Board” from 1 to 4)

2. At the end of operations turn off and restart the system.

Remark: It is possible, after restart, that the terminal is stuck on a unit. This is due to the fact that the memory of the Drivers remains fed by the buffer battery and keeps on to contain the data of the preceding configuration. In this case, with the system not fed, is sufficient to disconnect batteries from all the drivers and then connect them again

APPENDIX D: COMMUNICATION

The control supports communication on the serial port with the following protocols :

• Carel Proprietary protocol (local and remote), and MODEM/GSM modem through it
• MODbus Standard RTU
• LONTalk FTT10A (chiller profile)
• BACnet MS/TP & IP (single master points list)
- EKCSCII communication over proprietary protocol for unit and site optimization, monitoring and sequencing

Your preferred protocol is Menu selectable under User Password (Protocol Selectability™)

Protocol Menu is reachable through the arrow keys under Settings/USER/Setpoints menu.

To perform the right communication the serial card inserted in the serial plug of the controller must comply with the protocol selected.

Close-up of a screwdriver inserted into a mechanical tool, with no visible text or symbols on the tool itself.

Two types of pliers shown above and below, no text or symbols visible

Two grayscale aerial views of a highway with vehicles and a truck in the distance (no visible text or symbols)

As per the pictures above, to properly plug-in the card, open the cover of the serial card plug at the bottom of the controller, securely plug-in the card and close it back.

D. 1 Supervisor List Maps

Supervisory System

Chiller Profile Units (4-Jul-2007)

For Daikin Aircooled Screw units based on Carel pCO3 technology This is the full list of variables managed by the supervisory system.

LEGENDA
Flow Type
I: Supervisor ➔ pCOO: Supervisor ← pCOI/O: Supervisor ↔ pCO	D: DigitalI: IntegerA Analog
Green Boxes : CHILLER PROFILE variables RED Lines: Not Available on all versions
Grey, Yellow, Blue boxes are local variables subject to modification on release base	Variable format b0b1...b15 refers to word of digitals to be interpreted bitwise
Variables with single location for multiple circuits (symbol #1234)are indexed through the COMPSELECT variable index I32

D. 1.1 Supervisor List: Digital Variables

PROGRAM VARIABLES	DESCRIPTION TYPE INDEX	I/O BAC	LON MODBUS COIL			NOTES
SUPERV_ONOFF Chiller Enable - Network D 1 I/O x						5	2	0=Chiller Enable1=Chiller Disable
Chiller On Off nvoOnOff D 2 O x						27	3	0=Chiller Off1=Chiller On
MAN_GLB_AL	Alarm Digital Output	D 3 O	x			5	4	0=NoAlarm1=Alarm
UNIT_AV	Chiller Run Enabled	D 4 O	x			5	5	0=NotEnabled1=Enabled
Chiller Local/Remote	Chiller Local/Remote	D 5 O	x			27	6	Local=1Remote=0
LIMITATED	Chiller Capacity Limited	D 6 I/O	x			27	7	Limited=1Not Limited=0
EVAPORATOR_FLOW	Evap Water Flow	D 7 I/O	x			5	8	0=No Flow1=Flow
PwrUpState	Status request	D	9	I/O		3	10	0=RequestChillerAuto (run)1=Request Chiller Off
CLS_AL	Clear Alarm (BAS)	D	24	I/O	x	5	25	0=Default1=Clear Alarm
MAIN_PUMP	Evap Pump #1 (BAS Request)	D	29	O	x	5	30	0=Pump Commanded Off1=Pump Commanded On
FAN1_STAT #1,2,3,4	Fan Stage 1 - Circuit #1, 2, 3, 4	D	33	O			34	0=Fan Stage Off1=Fan Stage On
FAN2_STAT #1,2,3,4	Fan Stage 2 - Circuit #1, 2, 3, 4	D	34	O			35
FAN3_STAT #1,2,3,4	Fan Stage 3 - Circuit #1, 2, 3, 4	D	35	O			36
FAN4_STAT #1,2,3,4	Fan Stage 4 - Circuit #1, 2, 3, 4	D	36	O			37
FAN5_STAT #1,2,3,4	Fan Stage 5 - Circuit #1, 2, 3, 4	D	37	O			38
Unit_USA_SV	Supervisor Metrics	D	54	I/O			55	0 = SI1 = IP
COMP_ENABLE #1,2,3,4	Comp Manual OFF #1, 2, 3, 4	D	58	O			59	0=CompressorOFFMan1=CompressorAutoEnable
COMP_PD #1,2,3,4	Pump Down #1,2,3,4	D	62	O			63	0=Not Pumpdown1=Pumpdown Active
LIQUID_INJ #1,2,3,4	Liquid Injection/Line #1, 2, 3, 4	D	114	O			115	0=Deenergized1=Energized
COMP_LOAD #1,2,3,4	Stage Up Now #1, 2, 3, 4	D	150	O			151	0=Compressor Not Loading1=Compressor Loading
COMP_UNLOAD #1,2,3,4	Stage Down Now #1, 2, 3, 4	D	154	O			155	0=Compressor Not Unloading1=Compressor Unloading

D. 1.2. Supervisor List : Analog Variables

PROGRAM VARIABLES	DESCRIPTION TYPE		INDEX	I/O BAC LON			MODBUS REGISTER
S_Temp_Setpoint Cool Setpoint - Network A 1 I/O x 105 40002
Cold_Setpoint_Active Leaving Water Target A 2 O x 105 40003
W_CapL	Network Capacity Limit Input (#1,2,3,4)	A	3	I/O	x	81	40004
InletTemp	Evap Entering Water Temp	A	4	O	x	105	40005
W_TEMP_SETPOINT	Heat Setpoint - Network	A	5	I/O	x	105	40006
OUTLET_TEMP	Evap LWT - Unit	A	6	O	x	105	40007
UNIT_LOAD_DISP	Actual Running Capacity	A	10	O	x	81	40011
SUCT_TEMP	Suction Temp #1,2,3,4	A	15	O	x	105	40016
EVAP_TEMP	Evap Sat Refr Temp #1,2,3,4	A	16	O	x	105	40017
LOW_PRESS_TR	Evap Pressure #1,2,3,4	A	17	O	x	30	40018
AIN_4	Discharge Temp #1,2,3,4	A	19	O	x	105	40020
COND_TEMP	Cond Sat Refr Temp #1,2,3,4	A	20	O	x	105	40021
AIN_7	Cond Pressure #1,2,3,4	A	21	O	x	30	40022
nvoEntHRWTemp	Heat Recovery Entering Water Temperature	A	22	O	x	105	40023
nvoLvgHRWTemp	Heat Recovery Leaving Water Temperature	A	23	O	x	105	40024
COMP_STAT_DISP	Comp Load #1,2,3,4	A	25	O	x	81	40026
AIN_8	Feed Oil Pressure #1,2,3,4	A	32	O	x	30	40033
AMB_TEMP_Outdoor Air Temp - Sensor A 39 O		x 105 40040
ACT_DEMAND	Active Capacity Limit	A	42	O	x	33	40043
AOUT_1_DISPLAY	VFD Fan Output Volt (#1,2,3,4 if available)	A	44	O		81	40045
AOUT_2_DISPLAY	VFD Comp Output Volt (#1,2,3,4 if available)	A	45	O		81	40046
VALVE_POS	EXV Position #1,2,3,4	A	46	O		8	40047
nviCoolSetpt	Cool Setpoint	A	47	I/O	x	105	40048
Sum_Double_Setp	Summer Double Setpoint	A	50	I/O	x	105	40051
Event Code_1	Alarm List codes master board	A 90	O		00 = NONE		40091
					01 = Phase Alarm
					02 = Freeze Alarm
					03 = Freeze Alarm EV1
					04 = Freeze Alarm EV2
					05 = Pump Alarm
					06 = Fan Overload
					07 = OAT Low Pressure
					08 = Low Amb Start Fail
					09 = Unit 1 Offline
					10 = Unit 2 Offline
					11 = Evap. flow Alarm
					12 = Probe 9 Error
					13 = Probe 10 Error
					14 = "
					15 = Prepurge #1 Timeout
					16 = Comp Overload #1
					17 = Low Press. Ratio #1
					18 = High Press. Switch #1
					19 = High Press. Trans #1
					20 = Low Press. Switch #1
					21 = Low Press. Trans #1
					22 = High Disch Temp #1
					23 = Probe Fault #1
					24 = Transition Alarm #1
					25 = Low Oil Press #1
					26 = High Oil DP Alarm #1
					27 = Expansion Error
Event Code_2	Allarm List codes slave board	A	91	O	28 = "		40092
					29 = EXV Driver Alarm #1
					30 = EXV Driver Alarm #2
					31 = Restart after PW loss
					32 = "
					33 = "
					34 = Prepurge #2 Timeout
					35 = Comp Overload #2
					36 = Low Press. Ratio #2
					37 = High Press. Switch #2
					38 = High Press. Trans #2
					39 = Low Press. Switch #2
					40 = Low Press. Trans #2
					41 = High Disch. Temp #2
					42 = Maintenance Comp #2
					43 = Probe Fault #2
					44 = Transition Alarm #2
					45 = Low Oil Press.. #2
					46 = High Oil DP #2
					47 = Low Oil Level #2
					48 = PD #2 Timer Expired
					49 = Maintenance Comp #1
					50 = Driver #1 offline
					51 = Driver #2 offline
					52 = Low Oil Level #1
					53 = PD #1 Timer Expired
					54 = HR Flow Switch

D. 1.3 Supervisor List: Integer Variables

PROGRAM VARIABLES	DESCRIPTION TYPE		INDEX #	I/O	BAC	LON	MODBUS REGISTER	Notes
Active_Alarms_1 Active Alarms (1-16) I 1 O x 8 40130								b0 Reservedb1 Not usedb2 Not usedb3 Not usedb4 Not usedb5 Not usedb6 Not usedb7 Not usedb8 Not usedb9 Not usedb10 NO START - Ambient Temp Lowb11 NO LOAD - Cond Press High #1b12 NO LOAD - Cond Press High #2b13 NO LOAD - Cond Press High #3b14 NO LOAD - Cond Press High #4b15 Not used
Active_Alarms_2 Active Alarms (17-32) I 2 O x 8 40131								b0 UNLOAD - Cond Press High #1b1 UNLOAD - Cond Press High #2b2 UNLOAD - Cond Press High #3b3 UNLOAD - Cond Press High #4b4 Not usedb5 Not usedb6 Not usedb7 Not usedb8 Not usedb9 Not usedb10 Not usedb11 Not usedb12 Not usedb13 Not usedb14 NO RESET-Evap EWT Sensor Failb15 Not used
Active_Alarms_3 Active Alarms (33-48) I 3 O x 8 40132								b0 NO LOAD - Evap Press Low #1b1 NO LOAD - Evap Press Low #2b2 NO LOAD - Evap Press Low #3b3 NO LOAD - Evap Press Low #4b4 Not usedb5 UNLOAD - Evap Press Low #1b6 UNLOAD - Evap Press Low #2b7 UNLOAD - Evap Press Low #3b8 UNLOAD - Evap Press Low #4b9 Not usedb10 Not usedb11 Not usedb12 Not usedb13 PUMP ON - Evap Water Freeze #1b14 PUMP ON - Evap Water Freeze #2b15 PUMP ON - Evap Water Freeze #3
Active_Alarms_4 Active Alarms (49-64) I 4 O x 8 40133								b0 PUMP ON - Evap Water Freeze #4b1 START#2 - Evap Pump Fail #1b2 START#1 - Evap Pump Fail #2b3 Not usedb4 UNIT STOP-AmbAirTempSensorFailb5 Not usedb6 Not usedb7 Not usedb8 Not usedb9 Not usedb10 Not usedb11 Not usedb12 Not usedb13 Not usedb14 Not usedb15 Not used
Active_Alarms_5 Active Alarms (65-80) I 5 O x 8 40134								b0 Not usedb1 Not usedb2 Not usedb3 Not usedb4 COMP STOP - Motor Temp High #1b5 COMP STOP - Motor Temp High #2b6 COMP STOP - Motor Temp High #3b7 COMP STOP - Motor Temp High #4b8 COMP STOP - Phase Loss #1b9 COMP STOP - Phase Loss #2b10 COMP STOP - Phase Loss #3b11 COMP STOP - Phase Loss #4b12 Not usedb13 Not usedb14 Not usedb15 Not used
Active_Alarms_6 Active Alarms (81-96) I 6 O x 8 40135								b0 Not usedb1 Not usedb2 Not usedb3 Not usedb4 Not usedb5 Not usedb6 Not usedb7 Not usedb8 Not usedb9 COMP STOP-CondPressSensFail #1b10 COMP STOP-CondPressSensFail #2b11 COMP STOP-CondPressSensFail #3b12 COMP STOP-CondPressSensFail #4b13 Not usedb14 Not usedb15 COMP STOP - Cond Press High #1
Active_Alarms_7 Active Alarms (97 – 112) I 7 O x 8 40136								b0 COMP STOP - Cond Press High #2b1 COMP STOP - Cond Press High #3b2 COMP STOP - Cond Press High #4b3 Not usedb4 Not usedb5 Not usedb6 Not usedb7 COMP STOP-DischTempSensFail #1b8 COMP STOP-DischTempSensFail #2b9 COMP STOP-DischTempSensFail #3b10 COMP STOP-DischTempSensFail #4b11 COMP STOP-DischargeTempHigh #1b12 COMP STOP-DischargeTempHigh #2b13 COMP STOP-DischargeTempHigh #3b14 COMP STOP-DischargeTempHigh #4b15 Not used
Active_Alarms_8 Active Alarms (113 – 128) I 8 O x 8 40137								b0 COMP STOP-Evap Water Flow Lossb1 COMP STOP - Evap Water Freezeb2 Not usedb3 COMP STOP - Evap Press Low #1b4 COMP STOP - Evap Press Low #2b5 COMP STOP - Evap Press Low #3b6 COMP STOP - Evap Press Low #4b7 Not usedb8 COMP STOP-EvapPressSensFail #1b9 COMP STOP-EvapPressSensFail #2b10 COMP STOP-EvapPressSensFail #3b11 COMP STOP-EvapPressSensFail #4b12 Not usedb13 Not usedb14 Not usedb15 Not used
Active_Alarms_9 Active Alarms (129 – 144) I 9 O x 8 40138								b0 COMP STOP- Pressure Ratio Low #1b1 COMP STOP- Pressure Ratio Low #2b2 COMP STOP- Pressure Ratio Low #3b3 COMP STOP- Pressure Ratio Low #4b4 Not usedb5 Not usedb6 Not usedb7 Not usedb8 Not usedb9 Not usedb10 Not usedb11 Not usedb12 Not usedb13 Not usedb14 Not usedb15 Not used
Active_Alarms_10	Active Alarms (145 – 160)	I	10	O	x	8	40139	b0 Not usedb1 UNIT STOP-Evap LWT Sensor Failb2 COMP STOP-EvapLWT SensFail #1b3 COMP STOP-EvapLWT SensFail #2b4 Not usedb5 Not usedb6 Not usedb7 COMP STOP-MechHighPressTrip #1b8 COMP STOP-MechHighPressTrip #2b9 COMP STOP-MechHighPressTrip #3b10 COMP STOP-MechLowPress Trip #1b11 COMP STOP-MechLowPress Trip #2b12 COMP STOP-MechLowPress Trip #2b13 COMP STOP-MechLowPress Trip #3b14 COMP STOP-MechLowPress Trip #4b15 Not used
Active_Alarms_11	Active Alarms (161– 176)	I	11	O	x	8	40140	b0 Not usedb1 Not usedb2 Not usedb3 Not usedb4 Not usedb5 Not usedb6 Not usedb7 Not usedb8 Not usedb9 Not usedb10 Not usedb11 COMP STOP - Oil Level Low #1b12 COMP STOP - Oil Level Low #2b13 COMP STOP - Oil Level Low #3b14 COMP STOP - Oil Level Low #4b15 COMP STOP-Oil Filter DP High#1
Active_Alarms_12	Active Alarms (177 – 192)	I	12	O	x	8	40141	b0 COMP STOP-Oil Filter DP High#2b1 COMP STOP-Oil Filter DP High#3b2 COMP STOP-Oil Filter DP High#4b3 COMP STOP-OilFeedPrsSensFail#1b4 COMP STOP-OilFeedPrsSensFail#2b5 COMP STOP-OilFeedPrsSensFail#3b6 COMP STOP-OilFeedPrsSensFail#4b7 Not usedb8 Not usedb9 Not usedb10 Not usedb11 Not usedb12 Not usedb13 Not usedb14 Not used
								b15 Not used
Active_Alarms_13 Active Alarms (193-208) I 13 O x 8 40142								b0 Not usedb1 Not usedb2 Not usedb3 Not usedb4 COMP STOP-NoStartnTransition#1b5 COMP STOP-NoStartnTransition#2b6 COMP STOP-NoStartnTransition#3b7 COMP STOP-NoStartnTransition#4b8 COMP STOP-OilPressLow/Start #1b9 COMP STOP-OilPressLow/Start #2b10 COMP STOP-OilPressLow/Start #3b11 COMP STOP-OilPressLow/Start #4b12 Not usedb13 Not usedb14 Not usedb15 Not used
Active_Alarms_14 Active Alarms (209-224) I 14 O x 8 40143								b0 Not usedb1 Not usedb2 Not usedb3 Not usedb4 Not usedb5 Not usedb6 Not usedb7 Not usedb8 COMP STOP-SuctnTmpSensorFail#1b9 COMP STOP-SuctnTmpSensorFail#2b10 COMP STOP-SuctnTmpSensorFail#3b11 COMP STOP-SuctnTmpSensorFail#4b12 Not usedb13 Not usedb14 Not usedb15 Not used
Active_Alarms_15 Active Alarms (225-240) I 15 O x 8 40144								b0 FAULT (Check Unit for Detail)b1 COMP SHUTDOWN-Comp Fault #1b2 COMP SHUTDOWN-Comp Fault #2b3 COMP SHUTDOWN-Comp Fault #3b4 COMP SHUTDOWN-Comp Fault #4b5 Not usedb6 Not usedb7 Not usedb8 Not usedb9 Not usedb10 Not usedb11 Not usedb12 Not usedb13 Not usedb14 Not usedb15 Not used
nvi_mode Chiller Mode Sepoint I 17 I x 108 40146									01 = HVAC HEAT03 = HVAC_COOL (default)11 = HVAC_ICE
UNIT_STAT	LON Chiller Run Mode	I	18	O		8	40147		1 = Off: CSM2 = Start3 = Run4 = Pre Shutdown5 = Service6 = Communication Loss7 = Off: Local
chlr_op_mode	Chiller Operating Mode	I	19	O	x	127	40148	b0b1b2b3b4b5b6b7b8b9b10b11b12b13b14b15	00 = Auto01 = Heat03 = Cool06 = Off11 = IceUnit AlarmUnit OnChiller Local or RemoteLimited Flow Switch Status
nvoSequenceStat	Sequence Status	I	22	O	x	165	40151	b0b1b2b3b4b5b6b7b8	Chiller Full LoadCircuit1 AvailabilityCircuit 2 AvailabilityCircuit 3 AvailabilityCircuit 4 Availability-
COMP_SELECTED	Compressor Select	I	32	I	x	8	40161	1, 2, 3, 4
UNIT_STATUS_GLOB	Unit Status Display	I 34 O x 8 40163						00 = RUNNING OK01 = OFF ALARM02 = OFF REM COMM03 = OFF TIME SCHEDULE04 = OFF REM SWITCH05 = PWR LOSS ENTER START06 = OFF AMB.LOCKOUT

								07 = WAITING FLOW
								08 = WAITING LOAD
								09 = NO COMP AVAILABLE
								10 = FSM OPERATION
								11= OFF LOCAL SWITCH
								12 = OFF COOL / HEAT SWITCH
								13 = WAITING HR FLOW
Circuit Status #1,2,3,4 Circuit Status Display #1,2,3,4 I 44 O x 8 40 173								01 = OFF ALARM
								02 = OFF READY
								03 = OFF READY
								04 = OFF READY
								05 = OFF READY
								06 = OFF READY
								07 = OFF SWITCH
								08 = AUTO %
								09 = MANUAL %
								10 = OIL HEATING
								11 = READY
								12 = RECYCLE TIME
								13 = MANUAL OFF
								14 = PREPURGE
								15 = PUMPING DOWN
								16 = DOWNLOADING
								17 = STARTING
								18 = LOW DISCH SH
								19 = DEFROSTING
								20 = AUTO HEATING %
								21 = MAX VFD LOAD
								22 = OFF REM SV
N_START	Comp # of Starts #1,2,3,4 I 45 O x					8	40174
T_16_COMPRESSOR	Comp Operating Hours #1,2,3,4 I 46 O x					8	40175
T_16_PUMP_EVAP	Evap Pump Oper Hrs #1,2 I 47 O x					8	40176
MIN_T_BT_S_C	Start-Start Time I 94 O					8	40223
MIN_OFF	Stop-Start Time I 95 O					8	40224

APPENDIX E: PLANTVISOR MONITORING ACCESS

Pl@ntVisor Configuration.

PlantVisor is a proprietary software. It can be purchased as a part of a installation kit for Monitoring and Telemaintenance of your unit and system. Original PlantVisor is provided in for of a CD and a dedicated protection dongle.

Once installed, the product is already configured to operate with a 485 network with two units (one based on Ir32 freddo and one Ir32). To configure the product for your network, proceed as follows.

a. Connect to the supervisor using the browser. Example:

http://localhost

b. The following screen will be displayed

Alumis 1 Login guest Pass word: Ok Fbd PlantVisor CAREL

Click the "Ok" button to enter the site Home page. Note that initially "Guest" and "Administrator" are the only users defined, and therefore you do not need to access Pl@ntVisor as the Administrator in order to perform the initial configuration. No password is required.

The Pl@ntVisor Home page will then be displayed:

PentVisor NodoLocale Units Table Alarms/Events Report Service Layout Help Nodo Locale Devices list: ○ cela1 ○ cela2 Click here to change displayed v

d. Click the "Service" menu on the left and then select "Network".
e. The following page will be displayed:

Nodo Locale General Line 1 Line 2 Line 3 Line 4 Line 5 Line 6 Site configuration In this section, you can configure the description of the site, telephone number and other site information. Site description Site name: Nodo Locale Site ID number: 0 (must be different for each site) Site telephone #: 3 Save & Exit Exit

The first operation required is to enter the fields with the information on the installation:

a) Site name : name of the installation (node).
b) Site ID number : progressive identification number of the node (the installation cannot have two systems with the same ID).
c) Site telephone #: telephone number of the node (as a memo).

• All the instruments in the RS485 network must have been set with an address (see the corresponding parameter for the various models). The address, which is unique for each line, must be between 1 and 200
• Click the Line1, Line2, ..Line6 button (according to the number of lines being configured)
• Access the instruments in the network, as follows: first select the address or the series of addresses for the units, then assign a type of instrument (Device Type). In the Device Type menu list, all the options related to units
• “Daikin MSC” is the right Device Type option for units, EWAD AJ, EWAP AJ, EWAD BJ To delete an already configured unit, select the address in the From and To fields and assign type "----". To save the settings, click the Save&Exit button. To disable a unit, check the corresponding box in the Disabled column (then save the configuration).
  • Each unit can be assigned a customised description in the Device Description column.

General Line 1 Line 2 Line 3 Line 4 Line 5 Line 6 Devices configuration In this section, you can configure the devices connected to your line, the COM port where the line is connected and the line's protocol type. To add devices, select the serial address (or the serial address range if you want to add more than one device the same type) and define the type of device connected. To remove a device from the list, select the address (or address range) and select the ---- type. Serial configuration COM2 19200* RS485* Devices configuration Serial address Device Type Device Description Disabled 1 IR 32 cells1 2 IR 32 UN Temperatura cells2 From: 1 To: 1 Type: R32

After having done this, set the serial configuration in the "Serial Configuration" table.

- Select the communication port that the converter is connected to, the speed and the type of connection for each line in the network. The values displayed with the asterisk "*" are compatible with the Carel RS485 network.

- To save the configuration, click the Save&Exit button

For additional details, advanced management and troubleshooting refer to the PlantVisor User Manual and Online Help.

The present publication is drawn up by of information only and does not constitute an offer binding upon Daikin Applied Europe S.p.A.. Daikin Applied Europe S.p.A. has compiled the content of this publication to the best of its knowledge. No express or implied warranty is given for the completeness, accuracy, reliability or fitness for particular purpose of its content, and the products and services presented therein. Specification are subject to change without prior notice. Refer to the data communicated at the time of the order. Daikin Applied Europe S.p.A. explicitly rejects any liability for any direct or indirect damage, in the broadest sense, arising from or related to the use and/or interpretation of this publication. All content is copyrighted by Daikin Applied Europe S.p.A..