EWYT390B-SSA2-VFDFAN - Air-conditioner DAIKIN - Free user manual and instructions

USER MANUAL EWYT390B-SSA2-VFDFAN DAIKIN

REV	07
Date	10-2024
Supersedes	D-EOMHP01302-20_06EN

Operating Manual D-EOMHP01302-20_07EN

Air Cooled chiller/heat pump with scroll compressors

EWYT_B

EWAT_B

TABLE OF CONTENTS

1 SAFETY CONSIDERATIONS....5

1.1 General 5
1.2 Before switching the unit....5
1.3 Avoid electrocution....5

2 GENERAL DESCRIPTION....6

2.1 Basic Information 6
2.2 Abbreviations used....6
2.3 Controller Operating Limits....6
2.4 Controller Architecture 6
2.5 Communication Modules....7

4 WORKING WITH THIS UNIT 13

4.1 Chiller On/Off 13

4.1.1 Keypad On/Off 13
4.1.2 Scheduler and Silent mode functionalities....14
4.1.3 Network On/Off 15

4.2 Water Setpoints....15

4.3 Unit Mode....15

4.3.1 Heat/Cool Switch (Heat Pump Only) 17
4.3.2 Energy Saving mode 17

4.4 Unit Status....17
4.5 Network Control 18
4.6 Thermostatic Control....19
4.7 Date/Time....20
4.8 Pumps....20
4.9 External Alarm....21
4.10 Power Conservation....21

4.10.1 Demand Limit....21
4.10.2 Setpoint Reset 22

4.10.2.1 Setpoint Reset by OAT (A/C units only) 23
4.10.2.2 Setpoint Reset by External 4-20Ma signal 24
4.10.2.3 Setpoint Reset by DT 24

4.11 Electrical Data 25
4.12 Controller IP Setup....26
4.13 Daikin On Site 27
4.14 Heat Recovery 28
4.15 Rapid Restart 28
4.16 FreeCooling (Cooling Only)....29

4.16.1 FreeCooling Switch....32
4.16.2 Network On/Off 32

4.17 Collective Housing (Changeover Function, Heat Pump only) 32
4.18 Domestic Hot Water 33
4.19 Bivalent Operations....34
4.20 Software Options....35

4.20.1 Changing the Password for buying new Software Options 35
4.20.2 Inserting the Password in a Spare Controller....35
4.20.3 Modbus MSTP Software Option 36
4.20.4 BACNET MSTP 37
4.20.5 BACNET IP 38
4.20.6 PERFORMANCE MONITORING....38
4.20.7 Cascade 40

4.21 Smart Grid Application 40

5 ALARMS AND TROUBLESHOOTING....41

5.1 Unit Alerts....41

5.1.1 BadLWTReset - Bad Leaving Water Temperature Reset Input 41

5.1.2 EnergyMeterComm - Energy Meter Communication Fail 41

5.1.3 SmartGridComm – Smart Grid Communication Fail 41

5.1.4 EvapPump1Fault - Evaporator Pump #1 Failure 42

5.1.5 BadDemandLimit - Bad Demand Limit Input 42

5.1.6 EvapPump2Fault - Evaporator Pump #2 Failure 42

5.1.7 Switch Box Temperature sensor fault 43

5.1.8 ExternalEvent - External Event 43

5.1.9 HeatRec EntWTempSen - Heat Recovery Entering Water Temperature sensor fault 43

5.1.10 HeatRec LvgWTempSen - Heat Recovery Leaving Water Temperature sensor fault 44

5.1.11 HeatRec FreezeAlm - Heat Recovery Water Freeze Protect alarm 44

5.1.12 Option1BoardComm – Optional board 1 communication fail 44

5.1.13 Option2BoardComm – Optional board 2 communication fail 44

5.1.14 Option3BoardComm – Optional board 3 communication fail 45

5.1.15 EvapPDSen - Evaporator Pressure Drop sensor fault 45

5.1.16 LoadPDSen – Load Pressure Drop sensor fault 46

5.1.17 DHW WaterTmpSen – Domestic Hot Water Temperature sensor fault (Heat Pump Only) 46

5.1.18 BivSystLwtRemAlm-Bivalent System LWT Remote Alarm (Heat Pump Only) 46

5.2 Unit Pumpdown Alarms....47

5.2.1 UnitOff EvpEntWTempSen - Evaporator Entering Water Temperature (EWT) sensor fault 47

5.2.2 UnitOffLvgEntWTempSen - Evaporator Leaving Water Temperature (LWT) sensor fault 47

5.2.3 UnitOffAmbTempSen - Outside Air Temperature sensor fault 47

5.2.4 OAT:Lockout - Outside Air Temperature (OAT) Lockout (only in Cooling Mode)....48

5.2.5 UnitOff CollHsngWTempSen – Collective Housing Water Temperature (LWT) sensor fault (Heat Pump Only) 48

5.3 Unit Rapid Stop Alarms 48

5.3.1 Power Failure - Power Failure (only for units with the UPS option) 48

5.3.2 UnitOff EvapFreeze - Evaporator Water Temperature Low alarm 49

5.3.3 UnitOff ExternalAlarm - External alarm 49

5.3.4 UnitOff PVM - PVM 49

5.3.5 UnitOff EvapWaterFlow - Evaporator Water Flow Loss alarm 50

5.3.6 UnitOff EXVDriverComm - EXV Driver Extension Communication Error 50

5.3.7 UnitOff Option4BoardComm – Optional board 4 communication fail....50

5.3.8 DHW 3WVAlarm – Domestic Hot Water 3 Way Valve Alarm (Heat pump only) ....51

5.3.9 UnitOff WaterOverHeat–Water Over Temperature Alarm....51

5.4 Circuit Events....51

5.4.1 Cx CompXStartFail – Compressor starting fail event....51

5.4.2 Cx DischTempUnload – High Discharge Temperature Unload event.... 52

5.4.3 Cx EvapPressUnload – Low Evaporator Pressure Unload event 52

5.4.4 Cx CondPressUnload – High Condenser Pressure Unload event 52

5.4.5 Cx HighPressPd – High Pressure during Pumpdown event 53

5.4.6 DischTmp CompxSenf – Discharge Temperature of compressor sensor fault 53

5.4.7 CxStartFail - Start Fail 53

5.5 Circuit Pumpdown Stop Alarms....54

5.5.1 Cx Off DischTmpSen - Discharge Temperature Sensor fault 54

5.5.2 CxOff OffSuctTempSen - Suction Temperature Sensor fault (Heating Only) 54

5.5.3 CxOff GasLeakage - Gas Leakage fault 55

5.6 Circuit Rapid Stop alarms....55

5.6.1 CxOff CondPressSen - Condensing Pressure sensor fault 55

5.6.2 CxOff EvapPressSen - Evaporating Pressure sensor fault 55

5.6.3 CxOff DischTmpHigh - High Discharge Temperature Alarm 56

5.6.4 CxOff CondPressHigh – High Condensing Pressure alarm 56

5.6.5 CxOff EvapPressLow - Low Pressure alarm....57

5.6.6 CxOff RestartFault - Restart Fault 57

5.6.7 CxOff MechHighPress - Mechanical High Pressure Alarm 58

5.6.8 CxOff NoPressChange - No Pressure Change At Start Alarm....58

5.6.9 CompXAlm – Compressor starting fail alarm....59

5.6.10 Cx FailedPumpdown - Failed Pumpdown procedure....59

5.6.11 CmpX Protection – Compressor Protection 59

5.6.12 CxOff SSH LowLimit – SSH too low 60

5.6.13 CxOff Low DSH – DSH too low....60

5.6.14 CxOff Drift Suct temp....60

5.6.15 CxOff LowPrRatio - Low Pressure Ratio Alarm 60

5.6.16 CxEXVDriverFailure - EXV Driver Failure (mono unit) 61

5.6.17 CxOff BadFeedbackVlv – Bad Feedback from Valves Alarm (Cooling Only) 61

5.6.18 Cx BadFeedbackVlvFC – Bad Feedback from Valves in FreeCooling mode Alarm (Cooling Only) ...... 61

5.6.19 CxOff BadFeedbackVlvMech – Bad Feedback from Valves in Mechanical mode Alarm (Cooling Only) .... 62

5.6.20 CxOff BadFeedbackVlvMechPd - Bad Feedback from Valves in Mechanical PumpDown mode Alarm (Cooling Only) 62

5.6.21 CxOff BadFeedbackVlvFCPd – Bad Feedback from Valves in FreeCooling PumpDown mode Alarm (Cooling Only) 62

5.6.22 CxOff BadFeedbackVlvOnTransition – Bad Feedback from Valves in Transition state Alarm (Cooling Only) 63

1.1 General

Installation, start-up and servicing of equipment can be hazardous if certain factors particular to the installation are not considered: operating pressures, presence of electrical components and voltages and the installation site (elevated plinths and built-up up structures). Only properly qualified installation engineers and highly qualified installers and technicians, fully trained for the product, are authorized to install and start-up the equipment safely.

During all servicing operations, all instructions and recommendations, which appear in the installation and service instructions for the product, as well as on tags and labels fixed to the equipment and components and accompanying parts supplied separately, must be read, understood and followed.

Apply all standard safety codes and practices.

Wear safety glasses and gloves.

Do not operate on a faulty fan, pump or compressor before the main switch has been shut off. Overtemperature protection is auto-reset, therefore the protected component may restart automatically if temperature conditions allow it.

In some unit a push button is placed on a door of the unit electrical panel. The button is highlighted by a red color in yellow background. A manual pressure of the emergency stop button stops all loads from rotating, thus preventing any accident which may occur. An alarm is also generated by the Unit Controller. Releasing the emergency stop button enables the unit, which may be restarted only after the alarm has been cleared on the controller.

The emergency stop causes all motors to stop, but does not switch off power to the unit. Do not service or operate on the unit without having switched off the main switch.

1.2 Before switching the unit

Before switching on the unit read the following recommendations:

• when all the operations and all the settings have been carried out, close all the switchbox panels;
• the switchbox panels can only be opened by trained personnel;
• when the UC requires to be accessed frequently the installation of a remote interface is strongly recommended;
• LCD display of the unit controller may be damaged by extremely low temperatures (see chapter 2.4). For this reason, it is strongly recommended to never power off the unit during winter, especially in cold climates.

1.3 Avoid electrocution

Only personnel qualified in accordance with IEC (International Electrotechnical Commission) recommendations may be permitted access to electrical components. It is particularly recommended that all sources of electricity to the unit be shut off before any work is begun. Shut off main power supply at the main circuit breaker or isolator.

IMPORTANT: This equipment uses and emits electromagnetic signals. Tests have shown that the equipment conforms to all applicable codes with respect to electromagnetic compatibility.

Direct intervention on the power supply can cause electrocution, burns or even death. This action must be performed only by trained persons.

RISK OF ELECTROCUTION: Even when the main circuit breaker or isolator is switched off, certain circuits may still be energized, since they may be connected to a separate power source.

RISK OF BURNS: Electrical currents cause components to get hot either temporarily or permanently. Handle power cable, electrical cables and conduits, terminal box covers and motor frames with great care.

ATTENTION: In accordance with the operating conditions the fans can be cleaned periodically. A fan can start at any time, even if the unit has been shut down.

2.1 Basic Information

Microtech® IV is a system for controlling single or dual-circuit air/water-cooled liquid chillers. Microtech® IV controls compressor start-up necessary to maintain the desired heat exchanger leaving water temperature. In each unit mode it controls the operation of the condensers to maintain the proper condensation process in each circuit.

Safety devices are constantly monitored by Microtech® IV to ensure their safe operation. Microtech® IV also gives access to a Test routine covering all inputs and outputs.

2.2 Abbreviations used

In this manual, the refrigeration circuits are called circuit #1 and circuit #2. The compressor in circuit #1 is labelled Cmp1. The other in circuit #2 is labelled Cmp2. The following abbreviations are used:

A/C Air Cooled

CEWT Condenser Entering Water Temperature

CLWT Condenser Leaving Water Temperature

CP Condensing Pressure

CSRT Condensing Saturated Refrigerant Temperature

DSH Discharge Superheat

DT Discharge Temperature

ELWT Evaporator Leaving Water Temperature

EP Evaporating Pressure

ESRT Evaporating Saturated Refrigerant Temperature

EXV Electronic Expansion Valve

HMI Human Machine Interface

MOP Maximum operating pressure

SSH Suction SuperHeat

ST Suction Temperature

UC Unit controller (Microtech IV)

W/C Water Cooled

2.3 Controller Operating Limits

Operation (IEC 721-3-3):

• Temperature -40...+70 °C
• Restriction LCD -20... +60 °C
- Restriction Process-Bus -25....+70 °C
• Humidity < 90 % r.h (no condensation)
• Air pressure min. 700 hPa, corresponding to max. 3,000 m above sea level

Transport (IEC 721-3-2):

• Temperature -40...+70 °C
• Humidity < 95 % r.h (no condensation)
• Air pressure min. 260 hPa, corresponding to max. 10,000 m above sea level.

2.4 Controller Architecture

The overall controller architecture is the following:

• One Microtech IV main controller
- I/O extensions as needed depending on the configuration of the unit
- Communications interface(s) as selected
- Peripheral Bus is used to connect I/O extensions to the main controller.

graph TD
    A["BAS Interface (Bacnet,Lon,Mod bus)"] --> B["Microtech Main Controller"]
    B --> C["Peripheral Bus"]
    C --> D["I/O extension EXV 1"]
    D --> E["I/O extension EXV 2"]
    E --> F["I/O Extension Options"]

Maintain the correct polarity when connecting the power supply to the boards, otherwise the peripheral bus communication will not operate and the boards may be damaged.

2.5 Communication Modules

Any of the following modules can be connected directly to the left side of the main controller to allow a BAS or other remote interface to function. Up to three can be connected to the controller at a time. The controller should automatically detect and configure itself for new modules after booting up. Removing modules from the unit will require manually changing the configuration.

Module	Siemens Part Number	Usage
BacNet/IP	POL908.00/MCQ	Optional
Lon	POL906.00/MCQ	Optional
Modbus	POL902.00/MCQ	Optional
BACnet/MSTP	POL904.00/MCQ	Optional

The standard HMI consists of an inbuilt display (A) with 3 buttons (B) and a push'n'roll control (C).

UC A B C

The keypad/display (A) consists of a 5-line by 22 character display. The function of the three buttons (B) is described below:

Alarm status (from any page it links with the page with alarm list, alarm log and alarm snapshot if available) Back to Main Page

Back to the previous level (it can be the Main Page)

The push'n'roll command (C) is used to scroll between the different menu pages, settings and data available on the HMI for the active password level. Rotating the wheel allows to navigate between lines on a screen (page) and to increase and decrease changeable values when editing. Pushing the wheel acts as an Enter Button and will jump from a link to the next set of parameters.

3.1 Navigating

When power is applied to the control circuit, the controller screen will be active and display the Home screen, which can also be accessed by pressing the Menu Button.

An example of the HMI screens is shown in the following picture.

Main Menu 1 / 11

Enter Password

Unit Status =

0ff: Unit SW

Active Setpt = 7.0 °C

A bell ringing in the top right corner will indicate an active alarm. If the bell doesn't move it means that the alarm has been acknowledged but not cleared because the alarm condition hasn't been removed. A LED will also indicate where the alarm is located between the unit or circuits.

M a i n M e n u 1 / E n t e r P a s s w o r d U n i t S t a t u s = O f f : U n i t S W A c t i v e S e t p t = 7 . 0 °C

The active item is highlighted in contrast, in this example the item highlighted in Main Menu is a link to another page. By pressing the push'n'roll, the HMI will jump to a different page. In this case the HMI will jump to the Enter Password page.

Enter Password 2 / 2
Enter PW	* * * *

3.2 Passwords

The HMI structure is based on access levels that means that each password will disclose all the settings and parameters allowed to that password level. Basic informations about the status can be accessed without the need to enter the password. The user UC handles two level of passwords:

USER	5321
MAINTENANCE	2526

The following information will cover all data and settings accessible with the maintenance password.

In the Enter Password screen, the line with the password field will be highlighted to indicate that the field on the right can be changed. This represents a setpoint for the controller. Pressing the push'n'roll the individual field will be highlighted to allow an easy introduction of the numeric password.

Enter Password 2 / 2 Enter PW 5 * * *

The password will time out after 10 minutes and is cancelled if a new password is entered or the control powers down. Entering an invalid password has the same effect as continuing without a password. It is changeable from 3 to 30 minutes via the Timer Settings menu in the Extended Menus.

3.3 Editing

The Editing Mode is entered by pressing the navigation wheel while the cursor is pointing to a line containing an editable field. Pressing the wheel again cause the new value to be saved and the keypad/display to leave the edit mode and return to the navigation mode.

3.4 Mobile app HMI

The Daikin mAP mobile app HMI is provided for free and aims to simplify the interaction with this Daikin product. The app can be downloaded from the official stores with the following links (scan the QR code to access directly the download pages on the stores).

iOS

Android

To use the app is needed to pre-register an account and gain access to the specific unit to access. The access will be granted per unit base. A user can access multiple units after the app-tenant authorize this access. The procedure to register an account is in app. It's necessary to follow the sign in link in the app:

User login If you have a Dublin Applied Human account you can use it to log us. AUTHENTICATE WITH MERCOSIT At your own user SINN US Or log in with your Dublin mAP credentials MAIL INVOICE Target personal IP SINN

New user Enter your details to request access. MAIL Accessories The password is required to access the URL, but your URL will be displayed. Any other URL will not be requested. NAME ENGLISH COMPANY Let us inFORMATIZULAT VICTORAMENTO DE LAIR Personal, incursento expresamente al victoramento del fini (all personal) List!

The mobile app will allow you to monitor all the relevant data, change the user related settings, trend data, update chiller software and more to come. App layout will adapt based on the device where the app is running and will look as follows:

DAIKIN EWYT-B--A UNIT STATUS 15 AUTO COOL Before setup 7°C Just actual setting 27% Parameters management User Data System CITIORS UNIT UNIT DATA CY DATA CY DATA CIRCUIT 1 ID CIRCUIT 2 ID CONGREGATION FEATURES SETUP UNITQ TEST UNIT UNMAPPED FAVOURTEE Parameters that you notice these departments are displayed terms; but now the test is empty. Select one of the ratings from the top menu to browse their parameters as user

Dashboard EWYT-B--A + 20%RH UNIT GROUP 11 AUTO COOL Active input 7°C HIGHLIGHT IMPOSATOR - Warm temperature Entering 6.56743 °C Leaving 6.62539 °C EXTERNAL AIR

For further information consult the Quick Guide Daikin Map 1.0 D-EPMAP00101-23\_EN

3.5 Basic Control System Diagnostic

Microtech IV controller, extension modules and communication modules are equipped with two status LED (BSP and BUS) to indicate the operational status of the devices. The BUS LED indicates the status of the communication with the controller. The meaning of the two status LED is indicated below.

Main Controller (UC)

BSP LED	Mode
Solid Green	Application running
Solid Yellow	Application loaded but not running (*) or BSP Upgrade mode active
Solid Red	Hardware Error (*)
Flashing Green	BSP startup phase. The controller needs time for starting.
Flashing Yellow	Application not loaded (*)
Flashing Yellow/Red	Fail safe mode (in case that the BSP upgrade was interrupted)
Flashing Red	BSP Error (software error*)
Flashing Red/Green	Application/BSP update or initialization

(*) Contact Service.

Extension modules

BSP LED	Mode	BUS LED	Mode
Solid Green	BSP running	Solid Green	Communication running, I/O working
Solid Red	Hardware Error (*)	Solid Red	Communication down (*)
Flashing Red	BSP Error (*)	Solid Yellow	Communication running but parameter from the application wrong or missing, or uncorrect factory calibration
Flashing Red/Green	BSP upgrade mode

Communication modules
BSP LED (same for all modules)

BSP LED	Mode
Solid Green	BPS running, communication with controller
Solid Yellow	BSP running, no communication with controller (*)
Solid Red	Hardware Error (*)
Flashing Red	BSP Error (*)
Flashing Red/Green	Application/BSP update

(*) Contact Service.

BUS LED

BUS LED	LON	Bacnet MSTP	Bacnet IP	Modbus
Solid Green	Ready for Communication. (All Parameter loaded, Neuron configured). Doesn't indicate a communication with other devices.	Ready for Communication. The BACnet Server is started. It doesn't indicate an active communication	Ready for Communication. The BACnet Server is started. It doesn't indicate an active communication	All Communication running
Solid Yellow	Startup	Startup	Startup. The LED stays yellow until the module receives a IP Address, therefore a link must be established.	Startup, or one configured channel not communicating to the Master
Solid Red	No Communication to Neuron (internal error, could be solved by downloading a new LON application)	BACnet Server down. Automatically a restart after 3 seconds are initiated.	BACnet Server down. Automatic restart after 3 seconds is initiated.	All configured Communications down. Means no communication to the Master. The timeout can be configured. In case that the timeout is zero the timeout is disabled.
Flashing Yellow	Communication not possible to the Neuron. The Neuron must be configured and set online over the LON Tool.

3.6 Controller maintenance

The controller requires to maintain the installed battery. Every two years it's required to replace the battery. Battery model is: BR2032 and it is produced by many different vendors.

To replace the battery remove the plastic cover of the controller display using a screw driver as shown in the following pictures:

Close-up of a vintage electronic device with a knob and indicator lights, no visible text or symbols

Close-up of a white electronic device with a control panel and a finger inserted, placed on a blue surface (no visible text or symbols)

Close-up of a device panel with a circular inset showing a small electronic component (no visible text or symbols)

Be careful to avoid damages to the plastic cover. The new battery shall be placed in the proper battery holder which is highlighted in the picture, respecting the polarities indicated into the holder itself.

3.7 Optional Remote User Interface

As an option an external Remote HMI can be connected on the UC. The Remote HMI offers the same features as the inbuilt display plus the alarm indication done with a light emitting diode located below the bell button.

All viewing and setpoint adjustments available on the unit controller are available on the remote panel. Navigation is identical to the unit controller as described in this manual.

MicroTech®

The Remote HMI can be extended up to 700m using the process bus connection available on the UC. With a daisy-chain connection as below, a single HMI can be connected to up to 8 units. Refer to the specific HMI manual for details.

graph LR
    A["RSROM"] --> B["UDTM"]
    B --> C["UDTM NOS"]
    C --> D["UDTM NOS"]
    D --> E["UDTM NOS"]
    A -->|CE+| F["BUK"]
    A -->|CE-| G["WHT"]
    B -->|CE+| H["BUK"]
    B -->|CE-| I["WHT"]
    C -->|CE+| J["BUK"]
    C -->|CE-| K["WHT"]
    D -->|CE+| L["BUK"]
    D -->|CE-| M["WHT"]
    E -->|CE+| N["BUK"]
    E -->|CE-| O["WHT"]

3.8 Embedded Web Interface

The Microtech IV controller has an embedded web interface that can be used to monitor the unit when connected to a local network. It is possible to configure the IP addressing of the Microtech IV as a fixed IP of DHCP depending on the network configuration.

With a common web browser a PC can connect with the unit controller entering the IP address of the controller or the host name, both visible in the "About Chiller" page accessible without entering a password.

When connected, it will be required to enter a user name and a password. Enter the following credential to get access to the web interface:

User Name: Daikin

Password: Daikin@web

The Main Menu page will be displayed. The page is a copy of the onboard HMI and follows the same rules in terms of access levels and structure.

Home Refresh User@File Bend Legend Info 4 Main Menu Enter Password View/Set Unit View/Set Circuit Unit Status Off: Unit Switch Setpoint 7.0°C Evaporator LWT 7.0°C Unit Capacity 0.0%

In addition it allows to trend log a maximum of 5 different quantities. It's required to click on the value of the quantity to monitor and the following additional screen will become visible:

Depending on the web browser and its version the trend log feature may not be visible. It's required a web browser supporting HTML 5 like for example:

• Microsoft Internet Explorer v.11,
• Google Chrome v.37,
- Mozilla Firefox v.32.

These software are only an example of the browser supported and the versions indicated have to be intended as minimum versions.

4.1 Chiller On/Off

Starting from factory setup, unit On/Off can be managed by the user using the selector Q0, placed in the electrical panel, which can switch between three positions: 0 - Local - Remote.

0

Unit is disabled

Loc (Local)

Unit is enabled to start the compressors

Rem (Remote)

Unit On/Off is managed through the "Remote On/Off" physical contact.
Closed contact means unit enabled.
Opened contact means unit disabled.
Refer to the electrical wiring diagram, Field Wiring Connection page, to find the references about Remote On/Off contact. Generally, this contact is used to bring out from the electrical panel the on/off selector.

Some chiller models can be equipped with additional selectors Q1 - Q2 used to enable or disabled specific refrigerant circuit.

0

Circuit 1 is disabled.

1

Circuit 1 is enabled.

Unit controller provides also additional software features to manage unit start/stop, that are set by default to allow unit start:

1. Keypad On/Off
2. Scheduler (Time programmed On/Off)
3. Network On/Off (optional with communication modules)

4.1.1 Keypad On/Off

In the main page, scroll down until Unit Enable menu, where are available all settings to manage unit and circuits start/stop.

Info Main Menu Enter Password Unit Status Off: Unit Switch Setpoint 7.0°C Evaporator LWT 7.0°C Unit Capacity 0.0% Unit Enable Yes Unit Mode Cool

Info 4 Unit Enable Unit Enable ▶ Circuit #1 Enable ▶ Circuit #2 Enable ▶ ESC OK

Parameter	Range	Description
Unit	Disable	Unit disabled
	Enable	Unit enabled
	Scheduler	Unit start/stop can be time programmed for each weekday
Circuit #X	Disable	Circuit #X disabled
	Enable	Circuit #X enabled
	Test	Circuit #X in test mode. This feature has to be used only from trained person or Daikin service

Unit Enable Disable Enable Scheduler Save Cancel

Circuit #1 Enable Disable Enable Test Save Cancel

4.1.2 Scheduler and Silent mode functionalities

The Scheduler function can be used when is required an automatic chiller start/stop programming.

To use this function, follow below instructions:

1. Q0 selector = Local (refer to 4.1)
2. Unit Enable = Scheduler (refer to 4.1.1)
3. Controller date and time properly set (refer to 4.7)

Scheduler programming is available going in Main Page → View/Set Unit → Scheduler menu

Info 6 Scheduler State Off Monday Passive Tuesday Passive Wednesday Active Thursday Passive Friday Passive Saturday Passive Sunday Passive

Info 6 Monday Time 1 00:00 Value 1 Off Time 2 06:30 Value 2 Off Time 3 * : * Value 3 Off Time 4 * : * Value 4 Off

For each weekday can be programmed up to six time bands with a specific operating mode. First operating mode starts at Time 1, ends at Time 2 when will start the second operating mode and so on until the latest.

Time 1 00▼ : 00▼ Save Cancel

Value 1 OFF Off On 1 On 2 On 1 - Silent On 2 - Silent Save Cancel

Depending on unit type, different operating modes are available:

Parameter	Range	Description
Value 1	off	Unit disabled
	On 1	Unit enabled – Water setpoint 1 selected
	On 2	Unit enabled – Water setpoint 2 selected
	On 1 - Silent	Unit enabled – Water setpoint 1 selected – Fan silent mode enabled
	On 2 - Silent	Unit enabled – Water setpoint 2 selected – Fan silent mode enabled

When the Fan Silent Mode function is enabled the chiller noise level is reduced decreasing the maximum speed allowed for fans. Following table reports how much maximum speed is decreased for the different unit types.

Unit noise class	Normal maximum fan speed [rpm]	Silent mode maximum fan speed [rpm]
Standard	900	700
Low	900	700
Reduced	700	500

All data reported in the table, will be respected only if the chiller is operating within its operating limits.

The Fan Silent Mode function can be enabled only for units equipped with VFD fans.

4.1.3 Network On/Off

Chiller On/Off can be managed also with serial protocol, if the unit controller is equipped with one or more communication modules (BACNet, Modbus or LON). In order to control the unit over the network, follow below instructions:

1. Q0 selector = Local (refer to 4.1)
2. Unit Enable = Enable (refer to 4.1.1)
3. Control Source = Network (refer to 4.5)
4. Close the contact Local/Network Switch (refer to 4.5), when required!

4.2 Water Setpoints

Purpose of this unit is to cool or to heat (in case of heat pump) the water temperature, to the setpoint value defined by the user and displayed in the main page:

Info Main Menu Enter Password Unit Status Off: Unit Switch Setpoint 7.0°C Evaporator LWT 7.0°C Unit Capacity 0.0% Unit Enable Yes Unit Mode Cool

Info 4 Setpoints Cool LWT 1 7.0°C Cool LWT 2 7.0°C Actual Reset 0.0 Ice LWT 4.0°C HR EWT Sp 40.0°C HR EWT Dif 2.0°C HR Lock Limit 25.0°C HR Delta Sp 5.0°C

The unit can work with a primary or a secondary setpoint, that can be managed as indicated below:

1. Keypad selection + Double Setpoint digital contact
2. Keypad selection + Scheduler Configuration
3. Network
4. Setpoin Reset function

As first step the primary and secondary setpoints need to be defined. From main menu, with user password, press on Setpoint.

Parameter	Range	Description
Cool LWT 1	Ranges of the Cool, Heat, Ice setpoint are reported in the IOM of every specific unit.	Primary cooling setpoint.
Cool LWT 2		Secondary cooling setpoint.
Actual Reset		This item is visible only when the Setpoint Reset function is enabled and it shows the actual reset applied to the basic setpoint
Heat LWT 1		Primary heating setpoint.
Heat LWT 2		Secondary heating setpoint.
Ice LWT		Setpoint for Ice mode.

The change between primary and secondary setpoint can be performed using the Double setpoint contact, always available in the user terminal box, or through the Scheduler function.

Double setpoint contact works as below:

• Contact opened, the primary setpoint is selected
• Contact closed, the secondary setpoint is selected

In order to change between primary and secondary setpoint with the Scheduler, refer to the section 4.1.2.

When the scheduler function is enabled, the Double setpoint contact is ignored

When the operating mode Cool/Ice w/Glycol is selected, the Double Setpoint contact will be used to switch between the Cool and Ice mode, producing no change on the active setpoint

To modify the active setpoint through network connection, refer to Network control section 4.5.

The active setpoint can further modified using the Setpoint Reset function as explained in the section 4.10.2.

4.3 Unit Mode

The Unit Mode is used to define if the chiller is working to produce chilled or heated water. Current mode is reported in the main page to the item Unit Mode.

Info + Main Menu Setpoint 7.0°C Evaporator LWT 7.0°C Unit Capacity 0.0% Unit Enable Yes Unit Mode Cool Timers Alarms Commission Unit ESC OK

Info Unit Mode Mode Cool Energy Saving Yes Heating Only Not Active

Depending on the unit type, different operating modes can be selected entering, with maintenance password, in the Unit Mode menu. In the table below are listed and explained all modes.

Parameter	Range	Description	Unit Range
Mode	Cool	Set if chilled water temperature up to 4°C is required. No glycol is generally needed in the water circuit, unless ambient temperature may reach low values.	A/C
	Cool w/Glycol	Set if chilled water temperature below 4°C is required. This operation requires proper glycol/water mixture in the evaporator water circuit.	A/C
	Cool/Ice w/Glycol	Set in case a dual cool/ice mode is required. The switch between the two modes is performed using the contact physical Double Setpoint.Double Setpoint opened: the chiller will work in cooling mode with the Cool LWT being as the Active Setpoint.Double Setpoint closed: The chiller will work in Ice mode with the Ice LWT as the Active Setpoint.	A/C
	Ice w/Glycol	Set if ice storage is required. The application requires the compressors to operate at full load until the ice bank is completed, and then to stop for at least 12 hours. In this mode the compressor(s) will not operate at part load, but will work only in on/off mode.	A/C
	The following modes allow to switch the unit between heat mode and one of the previous cool mode (Cool, Cool w/Glycol, Ice)
	Heat/Cool	Set in case a dual cool/heat mode is required. This setting implies an operation with double functioning which is activated through the Cool/Heat switch on the electric box.Switch COOL: The chiller will work in cooling mode with the Cool LWT as the Active Setpoint.Switch HEAT: The chiller will work in heat pump mode with the Heat LWT as the Active Setpoint.	Heat Pump Only
	Heat/Cool w/Glycol	Set in case a dual cool/heat mode is required. This setting implies an operation with double functioning which is activated through the Cool/Heat switch on the electric box.Switch COOL: The chiller will work in cooling mode with the Cool LWT as the Active Setpoint.Switch HEAT: The chiller will work in heat pump mode with the Heat LWT as the Active Setpoint.	A/C
	Heat/Ice w/Glycol	Set in case a dual Ice/Heat mode is required. This setting implies an operation with double functioning which is activated through the Cool/Heat switch on the electric box.Switch ICE: The chiller will work in cooling mode with the Ice LWT as the Active Setpoint.Switch HEAT: The chiller will work in heat pump mode with the Heat LWT as the Active Setpoint.	A/C
	Test	Enables the Manual Control of the unit. The manual test feature helps in debugging and checking the operational status of actuators. This feature is accessible only with the maintenance password in the main menu. To activate the test feature is required to disable the Unit from the Q0 switch and change the available mode to Test.	A/C
Energy Saving	No, Yes	Disable/Enable of the energy saving function
Heating Only	Not Active, Active	Indicates if the unit can work ONLY in heating mode or not	Heat Pump only

Like the On/Off and setpoint control, also the unit mode can be modified from network. Refer to Network control section 4.5 for more details.

4.3.1 Heat/Cool Switch (Heat Pump Only)

Starting from factory setup, Heat mode switch can be managed by the user using the selector QHP, placed in the electrical panel, which can switch between three positions: 0 - 1.

chiller

Unit will work in Cooling Mode

Loc (Local)

Unit will work in Heating mode

Rem (Remote)

Unit Operating mode is managed through the "Remote" control through BMS communication.

In order to enable the Heat mode, the Unit mode must be set in "Heat/Cool" mode, and the QHP switch must be set in Loc position.

4.3.2 Energy Saving mode

Some unit types provide the possibility to enable an energy saving function, that reduces the power consumption deactivating the compressors crankcase heater, when the chiller is Disabled.

This mode implies that the time needed to start the compressors, after an Off period, could be delayed until a maximum of 90 minutes.

For time critical application, the energy saving function can be disabled by the user to ensure the compressor start within 1 minute from unit On command.

Info 4 Main Menu Setpoint 7.0°C Evaporator LWT 7.0°C Unit Capacity 0.0% Unit Enable Yes Unit Mode Cool Timers Alarms Commission Unit ESC OK

Info 1 Unit Mode Mode Cool Energy Saving Yes ESC OK

4.4 Unit Status

Unit controller provides in the main page some information about chiller status. All chiller states are listed and explained below:

Parameter	Overall status	Specific status	Description
Unit Status	Auto:		Unit is in Auto control. The pump is running and at least one compressor is running.
		Wait For Load	Unit is in standby because the thermostatic control satisfies the active setpoint.
		Water Recirc	Water pump is running in order to equalize the water temperature in the evaporator.
		Wait For Flow	Unit pump is running but the flow signal still indicates a lack of flow through the evaporator.
		Max Pulldown	Unit thermostatic control is limiting the unit capacity as the water temperature is dropping too quickly.
		Capacity Limit	Demand limit has been hit. Unit capacity will not further increase.
		Current Limit	Maximum current has been hit. Unit capacity will not further increase.
		Silent Mode	Unit is running and Silent Mode is enabled
	off:	Master DisableIce Mode Timer	Unit is disabled by the Master Slave functionThis status can be shown only if the unit can work in Ice Mode. The unit is off because the Ice setpoint has been satisfied. Unit will remain off until the Ice Timer has expired.
		OAT Lockout	The unit cannot run because the Oustide Air Temperature is below the limit foreseen for the condenser temperature control system installed in this Unit. If the Unit has to run anyway, check with your local maintenance how to proceed.
		Circuits Disabled	No circuit is available to run. All circuits can be disabled by their individual enable switch or can be disabled by a component safety condition active or can be disabled by keypad or can be all in alarms. Check the individual circuit status for further details.
		Unit Alarm	A unit alarm is active. Check the alarm list to see what is the active alarm inhibiting the unit to start and check if the alarm can be cleared Refer to section 5. before proceeding.
		Keypad Disable	The Unit has been disabled by keypad. Check with your local maintenance if it can be enabled.
		Network Disabled	Unit is disabled by Network.
		Unit Switch	The Q0 selector is set to 0 or the or the Remote On/Off contact is opened.
		Test	Unit mode set to Test. This mode is activated to check operability of onboard actuators and sensors. Check with the local maintenance if the Mode can be reverted to the one compatible with unit application (View/Set Unit – Set-Up – Available Modes).
		Scheduler Disable	Unit is disabled by Scheduler programming
	Pumpdown		Unit is performing the pumpdown procedure and d it will stop within few minutes

4.5 Network Control

When the unit controller is equipped with one or more communication modules the Network Control feature can be enabled, which gives the possibility to control the unit via serial protocol (Modbus, BACNet or LON).

To allow unit's control from network, follow below instructions:

1. Close the physical contact "Local/Network Switch". Refer to unit electrical wiring diagram, Field Wiring Connection page, to find the references about this contact.
2. Go to Main Page → View/Set Unit → Network Control Set Controls Source = Network

Info 2 View/Set Unit Thermostatic Control Network Control Pumps Scheduler Date/Time Controller IP Setup Daikin On Site Settings Change History

Info 4 Network Control Control Source Network Enable Disable Mode Cool Cool LWT 7.0°C Ice LWT 4.4°C Heat LWT 45.0°C Capacity Limit 100%

Network Control menu returns all main values received from serial protocol.

Parameter	Range	Description
Control Source	Local	Network control disabled
	Network	Network control enabled
Enable	-	On/Off command from network
Mode	-	Operating mode from network
Cool LWT	-	Cooling water temperature setpoint from network
Ice LWT	-	Ice water temperature setpoint from network
Heat LWT	-	Heating water temperature setpoint from network
FreeCooling	Enable/Disable	On/Off command from network
Capacity Limit	-	Capacity limitation from network

Refer to communication protocol documentation for specific registers addresses and the related read/write access level.

4.6 Thermostatic Control

Thermostatic control settings allow to set up the response to temperature variations. Default settings are valid for most application, however plant specific conditions may require adjustments in order to have a smooth control or a quicker response of the unit.

The control will start the first compressor if the controlled temperature is higher (Cool Mode) or lower (Heat Mode) than the active setpoint of at least a Start Up DT value, whereas other compressors are started, step by step, if the controlled temperature is higher (Cool Mode) or lower (Heat Mode) than the active setpoint (AS) of at least a Stage Up DT (SU) value. Compressors stop if performed following same procedure looking to the parameters Stage Down DT and Shut Down DT.

	Cool Mode	Heat Mode
First compressor start	Controlled Temperature > Setpoint + Start Up DT	Controlled Temperature < Setpoint - Start Up DT
Other compressors start	Controlled Temperature > Setpoint + Stage Up DT	Controlled Temperature < Setpoint - Stage Up DT
Last compressor stop	Controlled Temperature < Setpoint - Shut Dn DT	Controlled Temperature > Setpoint - Shut Dn DT
Other compressors stop	Controlled Temperature < Setpoint - Stage Dn DT	Controlled Temperature > Setpoint - Stage Dn DT

A qualitative example of compressors start-up sequence in cool mode operation is shown in the graph below.

Thermostatic control settings are accessible from Main Page→Thermostatic Control

View/Set Unit Thermostatic Control Network Control Pumps Power Conservation Scheduler Date/Time Controller IP Setup Daikin On Site

Info 4 Thermostatic Control Start Up DT 2.5°C Shut Down DT 1.5°C Stage Up DT 1.0°C Stage Down DT 1.0°C Stage Up Delay 120s Stage Down Delay . 30s Ice Cycle Delay 12h

Parameter	Range	Description
Start Up DT	0.5-8°C	Delta temperature respect the active setpoint to start the unit (startup of first compressor)
Shut Down DT	0.5-3°C	Delta temperature respect the active setpoint to stop the unit (shutdown of latest compressor)
Stage Up DT	0.5-2.5°C	Delta temperature respect the active setpoint to start a compressor
Stage Down DT	0.5-1.5°C	Delta temperature respect the active setpoint to stop a compressor
Stage Up Delay	2-8 min	Minimum time between the compressors startup
Stage Down Delay	10-60 s	Minimum time between the compressors shutdown
Ice Cycle Delay	1-23 h	Unit standby period during Ice mode operation

4.7 Date/Time

The unit controller is able to take stored the actual date and time, that are used for:

1. Scheduler
2. Cycling of standby chiller with Master Slave configuration
3. Alarms Log

Date and time can be modified going in View/Set Unit → Date/Time

Info 4 View/Set Unit Thermostatic Control Network Control Pumps Power Conservation Scheduler Date/Time Controller IP Setup Daikin On Site

Date/Time Time 14:43:27 Date 05/15/2018 Day Thursday UTC Difference -60min Daylight Saving Time: Enable Yes Start Month Mar Start Week 2ndWeek

Parameter	Range	Description
Time		Actual date. Press to modify. Format is hh:mm:ss
Date		Actual time. Press to modify. Format is mm/dd/yy
Day		Returns the day of the week.
UTC Difference		Coordinated universal time.
Daylight Saving Time:
Enable	No, Yes	It is used to enable/disable the automatic switch of the Daylight Saving Time
Start Month	NA, Jan...Dec	DayLight Saving time start month
Start Week	1st...5th week	DayLight Saving time start week
End Month	NA, Jan...Dec	DayLight Saving time end month
End Week	1st...5th week	DayLight Saving time end week

Remember to check periodically the controller battery in order to maintain updated date and time even when there is no electrical power. Refer to controller maintenance section

4.8 Pumps

The UC can manage one or two water pumps. Number of pumps and their priority can be set from Main Page→View/Set Unit→Pumps.

Info 4 View/Set Unit Thermostatic Control Network Control Pumps Power Conservation Scheduler Date/Time Controller IP Setup Daikin On Site

Info 4 Pumps Evaporator: Pump Control #1 Only ▶ Recirculation Timer 30s ▶ Pump 1 Hours 0 ▶ Pump 2 Hours 0 ▶ Delta T 3.0dK

Parameter	Range	Description
Pump Control	#1 Only	Set to this in case of single pump or twin pump with only #1 operational (f.e. in case of maintenance on #2)
	#2 Only	Set to this in case of twin pump with only #2 operational (f.e. in case of maintenance on #1)
	Auto	Set for automatic pump start management. At each chiller start, the pump with the least number of hours will be
	#1 Primary	Set to this in case of twin pump with #1 running and #2 as a backup
	#2 Primary	Set to this in case of twin pump with #2 running and #1 as a backup
Recirculation Timer		Minimum time required within flow switch has to in order to allow unit startup
Pump 1 Hours		Pump 1 running hours
Pump 2 Hours		Pump 2 running hours

4.9 External Alarm

The External Alarm is a digital contact that can be used to communicate to the UC an abnormal condition, coming from an external device connected to the unit. This contact is located in the customer terminal box and depending on the configuration can cause a simple event in the alarm log or also the unit stop. The alarm logic associated to the contact is the following:

Contact state	Alarm State	Note
Opened	Alarm	The alarm is generated if the contact remains opened for at least 5 seconds
Closed	No Alarm	The alarm is reset just the contact is closed

The configuration is performed from the Commissioning → Configuration → Options menu

Info 1 Options Apply Changes No Communication 1 None Communication 2 None Communication 3 None Demand Limit No Energy Meter Nemo D4-Le Ext Alarm No Free Cooling No

Info 1 Options Ext Alarm Save Cancel Ext Alarm Free Cooling No Event Rapid Stop Pumpdown ESC OK

Parameter	Range	Description
Ext Alarm	Event	Event configuration generates an alarm in the controller but takes the unit running
	Rapid Stop	Rapid Stop configuration generates an alarm in the controller and performs a rapid stop of the unit
	Pumpdown	Pumpdown configuration generates an alarm in the controller and performs a pumpdown procedure to stop the unit.

4.10 Power Conservation

In this chapters will be explained the functions used to reduce the unit power consumption:

1. Demand Limit
2. Setpoint Reset

4.10.1 Demand Limit

The "Demand limit" function allows the unit to be limited to a specified maximum load. Capacity limit level is regulated using an external 4-20 mA signal with a linear relationship shown in the picture below. A signal of 4 mA indicates the maximum capacity available whereas a signal of 20 mA indicates the minimum capacity available. In order to enable this option, go to Main Menu → Commission Unit → Configuration → Options and set the Demand Limit parameter to Yes.

Graph 1 Demand Limit[mA] vs Capacity Limit[%]
It is worth pointing out that it is not possible to shut down the unit using the demand limit function, but only to unload it to its minimum capacity.

Note that this function does a real capacity limitation only if the unit is equipped with Screw compressors. In case of Scroll compressors, the demand limit operates a discretization of the overall unit capacity according to the actual number of compressors, and, depending on the external signal value, it enables only a subset of the total number of compressors, as shown in table below:

Number of Compressor	Demand Limit Signal [mA]	Maximum number of compressors On
4	4 < < 8	4
	8 < < 12	3
	12 < < 16	2
	16 < < 20	1
5	4 < < 7.2	5
	7.2 < < 10.4	4
	10.4 < < 13.6	3
	13.6 < < 16.8	2
	16.8 < < 20.0	1
6	4 < < 6.7	6
	6.7 < < 9.3	5
	9.3 < < 12	4
	12 < < 14.7	3
	14.7 < < 17.3	2
	17.3 < < 20	1

All info about this function are reported in the Main Menu → Commission Unit → Configuration → Options → Demand Limit page.

2 Demand Limit Compressors Running 0 Limit 2 Signal 15.0mA

4.10.2 Setpoint Reset

The "Setpoint Reset" function is able to override the chilled water temperature active setpoint when certain circumstances occur. The aim of this function is to reduce the unit energy consumption whilst maintaining the same comfort level. To this purpose, three different control strategies are available:

• Setpoint Reset by Outside Air Temperature (OAT)
• Setpoint Reset by an external signal (4-20mA)
• Setpoint Reset by Evaporator T (EWT)

In order to set the desired setpoint-reset strategy, go to Main Menu → Commission Unit → Configuration → Options and modify the Setpoint Reset parameter, according to the following table:

Info 1 Options M/S Address None M/S Num Of Units 2 M/S Sensor Type None PVM No Pump Type On-Off SwitchBoxT No Setpoint Reset EWT Display Units Metric ESC OK

Info 2 Options Setpoint Reset Save Cancel Apply Changes No No 4 - 20mA DT OAT ESC OK

Parameter	Range	Description
LWT Reset	No	Setpoint reset not enabled
	4-20mA	Setpoint reset enabled by an external signal between 4 and 20mA
	DT	Setpoint reset enabled by Evaporator Water Temperature
	OAT	Setpoint reset enabled by Outside Air Temperature

Each strategy needs to be configured (although a default configuration is available) and its parameters can be set navigating to Main Menu → view/Set Unit → Power Conservation→ Setpoint Reset.

Note that the parameters corresponding to a specific strategy will be available only once the Setpoint Reset has been set to a specific value and the UC has been restarted.

4.10.2.1 Setpoint Reset by OAT (A/C units only)

When the OAT is selected as Setpoint Reset option, the LWT active setpoint(AS) is calculated applying a correction to the basic setpoint that depends on the ambient temperature (OAT) and on the current Unit Mode (Heating mode or Cooling mode). Several parameters can be configured, and they are accessible from the Setpoint Reset menu, as shown below:

Info 4 Setpoint Reset Actual Reset 2.5°C Max Reset 5.0°C ▶ Max Reset OAT 25.0°C ▶ Start Reset OAT 15.0°C ▶ Evaporator EWT 12.0°C OAT 20.0°C Signal 4.0mA ESC OK

Parameter	Default	Range	Description
Actual Reset			Actual Reset shows which is the correction that will applied to the base setpoint
Max Reset (MR)	5.0°C	0.0°C÷10.0°C	Max Reset setpoint. It represents the maximum temperature variation that the selection of the OAT option can cause on the LWT.
Max Reset OAT (MROAT)	15.5°C	10.0°C÷29.4°C	It represents the “threshold temperature” that correspond to the maximum setpoint variation.
Start Reset OAT(SROAT)	23.8°C	10.0°C÷29.4°C	It represents the “threshold temperature” of the OAT to activate the LWT setpoint reset, i.e. the LWT setpoint is overwritten only if the OAT reaches/overpasses the SROAT.
Delta T			Is the actual evaporator delta temperature. Entering – Leaving water temperature
OAT			Actual outside ambient temperature
Signal			Actual input current read on the terminals Setpoint Reset

Provided the unit is set in Cooling mode (Heating mode), the more the ambient temperature drops below (goes beyond) the SROAT, the more the LWT active setpoint (AS) is increased(decreased), until the OAT reaches the MROAT limit. When the OAT overpasses the MROAT, the active setpoint does not increase(decrease) anymore, and it remains stable to its maximum(minimum) value, i.e. AS = LWT + MR(-MR).

Graph 2 Outside Ambient Temperature vs Active Setpoint - Cooling mode(left)/ Heating mode(right)

4.10.2.2 Setpoint Reset by External 4-20Ma signal

When the 4-20mA is selected as Setpoint Reset option, the LWT active setpoint(AS) is calculated applying a correction based on an external 4-20mA signal: 4 mA corresponds to 0°C correction, i.e. AS = LWT setpoint, whereas 20 mA corresponds to a correction of the Max Reset (MR) quantity, i.e. AS = LWT setpoint + MR(-MR) as shown in the following table:

Info Setpoint Reset Actual Reset 1.9°C Max Reset 5.0°C Delta T 3.0dK OAT 20.0°C Signal 10.0mA

Parameter	Default	Range	Description
Actual Reset			Actual Reset shows which is the correction that will applied to the base setpoint
Max Reset (MR)	5.0°C	0.0°C ÷ 10.0°C	Max Reset setpoint. It represents the maximum temperature variation that the selection of the 4-20mA option can cause on the LWT.
Delta T			Is the actual evaporator delta temperature. Entering – Leaving water temperature
OAT			Actual outside ambient temperature
Signal			Actual input current read on the terminals Setpoint Reset

Graph 3 External signal 4-20mA vs Active Setpoint - Cooling mode(left)/ Heating mode(right)

4.10.2.3 Setpoint Reset by DT

When the DT is selected as Setpoint Reset option, the LWT active setpoint(AS) is calculated applying a correction based on the temperature difference T between the leaving water temperature(LWT) and the evaporator entering(returning) water temperature (EWT). When the | T| becomes smaller than the Start Reset T setpoint(SR T ), the LWT active setpoint is proportionally increased (if Cooling mode set) or decreased (if Heating mode is set) of a maximum value equal to the Max Reset(MR) parameter.

Info 4 Setpoint Reset Actual Reset 2.0°C Max Reset 5.0°C ▶ Start Reset DT 5.0°C ▶ Delta T 3.0dK OAT 20.0°C Signal 4.0mA

Graph 4 Evap T vs Active Setpoint - Cooling mode(left)/ Heating mode(right)

Parameter	Default	Range	Description
Max Reset (MR)	5.0°C	0.0°C ÷ 10.0°C	Max Reset setpoint. It represents the maximum temperature variation that the selection of the EWT option can cause on the LWT.
Max Reset (MR)	5.0°C	0.0°C ÷ 10.0°C	Max Reset setpoint. It represents the maximum temperature variation that the selection of the DT option can cause on the LWT.
Start Reset DT (SRΔT)	5.0°C	0.0°C ÷ 10.0°C	It represents the “threshold temperature” of the DT to activate the LWT setpoint reset, i.e. the LWT setpoint is overwritten only if the DT reaches/overpasses the SRΔT.
Delta T			Is the actual evaporator delta temperature. Entering – Leaving water temperature
OAT			Actual outside ambient temperature
Signal			Actual input current read on the terminals Setpoint Reset

4.11 Electrical Data

Unit controller returns main electrical values read by the energy meter Nemo D4-L or Nemo D4-Le. All data are collected in the menu Electrical Data.

Main Page → View/Set Unit → Electrical Data

View/Set Unit Thermostatic Control Network Control Pumps Heat Recovery Electrical Data Scheduler Date/Time Controller IP Setup

Info 4 Electrical Data Average Voltage 418V Average Current 1A Average Power 0.4kW Active Power 0kW Power Factor 0.85 Active Energy 18728kWh Frequency 50Hz

Parameter	Description
Average Voltage	Returns the average of the three chained voltages and links to the Voltage Data page
Average Current	Returns the current average and links to the Current Data page
Average Power	Returns the average power
Active Power	Returns the active power
Power Factor	Returns the power factor
Active Energy	Returns the active energy
Frequency	Returns the active frequency

Info 4 Voltage Data Average Voltage 418.7V V1 418.4V V2 418.3V V3 419.4V

1	Current Data
	Average Current	49.5A
	I1	49.3A
	I2	49.2A
	I3	49.9A

4.12 Controller IP Setup

The Controller IP Setup page is located at the path Main Menu → View/Set Unit → Controller IP Setup.

Info 4 View/Set Unit Thermostatic Control Network Control Pumps Power Conservation Scheduler Date/Time Controller IP Setup Daikin On Site

Info IP Setup Settings DHCP Active IP 192.168.001.042 Mask 255.255.255.000 Gateway 192.168.001.001 PrimDNS 10.39.148.17 ScndDNS 0.0.0.0 Name POL688 EE275F

All of the information about current MT4 IP Network settings is reported in this page, as shown in the following table:

Parameter	Range	Description
DHCP	Active	The DHCP option is enabled.
	Passive	The DHCP option is disabled.
IP	xxx.xxx.xxx.xxx	The current IP address
Mask	xxx.xxx.xxx.xxx	The current Subnet Mask address.
Gateway	xxx.xxx.xxx.xxx	The current Gateway address.
PrimDNS	xxx.xxx.xxx.xxx	The current Primary DNS address.
ScndDNS	xxx.xxx.xxx.xxx	The current Secondary DNS address.
Device	POLxxx_xxxxxxx	The Host Name of the MT4 controller.
MAC	XX-XX-XX-XX-XX-XX	The MAC address of the MT4 controller.

In order to modify the MT4 IP Network configuration, do the following operations:

- access the Settings menu

• set the DHCP option to Passive
• modify the IP, Mask, Gateway, PrimDNS and ScndDNS addresses, if needed, taking care of the current network settings
• set Apply changes parameter to Yes to save the configuration and restart the MT4 controller.

Info 1 IP Setup Settings DHCP Active IP 192.168.001.042 Mask 255.255.255.000 Gateway 192.168.001.001 PrimDNS 10.39.148.17 ScndDNS 0.0.0.0 Name POL688 EE275F ESC OK

Info 4 Settings Apply Changes Yes * Save Cancel Settings 10:25:196:197 ESC OS

The default internet configuration is:

Parameter	Default Value
IP	192.168.1.42
Mask	255.255.255.0
Gateway	192.168.1.1
PrimDNS	0.0.0.0
ScndDNS	0.0.0.0

Note that if the DHCP is set to On and the MT4 internet configurations shows the following parameter values

Parameter	Value
IP	169.254.252.246
Mask	255.255.0.0
Gateway	0.0.0.0
PrimDNS	0.0.0.0
ScndDNS	0.0.0.0

then an internet connection problem has occurred (probably due to a physical problem, like the Ethernet cable breaking).

4.13 Daikin On Site

The Daikin on Site(DoS) page can be accessed navigating through Main Menu □ View/Set Unit □ Daikin On Site.

Info 2 View/Set Unit Network Control Pumps Scheduler Date/Time Controller IP Setup Daikin On Site Settings Change History Menu Password ESC OK

Daikin on Site Communication Disabled State - Serial Number 2571 Remote Update Wait Activation Key SY65J5-NKID3-E5KGB-JKWXL-NK4V ICCID: Enter Data

In order to use the DoS utility, the customer has to communicate the Serial Number to Daikin company and subscribe to the DoS service. Then, from this page, it is possible to:

• Start/Stop the DoS connectivity
• Check the connection status to DoS service
• Enable/Disable the remote update option

according to the parameters shown into the table below.

Parameter	Range	Description
Comm Start	DisabledEnabled	Stop the connection to DoSStart the connection to DoS
Comm State	-	Connection to DoS is off
	IPErr	Connection to DoS cannot be established
	Connected	Connection to DoS is established and working
Remote Update	Wait	The Remote update is not allowed even the request is started from DOS
	Yes	Enable the Remote update option
	No	Disable the Remote update option

Among all the services provided by DoS, the Remote Update option allows to remotely update the software currently running on the PLC controller, avoiding an in-situ intervention of maintenance personnel. To this purpose, just set the Remote Update parameter to Yes. Otherwise, keep the parameter set to Wait or Disable.

For a successful remote software update, local service support is required, and a strong internet connection must be guaranteed.

In the unlikely event of PLC replacement, the DoS connectivity can be switched from the old PLC to the new one just communicating the current Activation Key to Daikin company.

4.14 Heat Recovery

The unit controller can handle a total or partial heat recovery option.

The heat recovery is enabled through the Q8 switch installed in the electrical panel.

Some settings need to be properly set in order to match the specific plant requirements, going in Main Page→View/Set Unit→Heat Recovery.

View/Set Unit Thermostatic Control Network Control Pumps Power Conservation Heat Recovery Scheduler Date/Time Controller IP Setup

Info 4 Heat Recovery HR State Recirculation HR LWT 0.0°C HR EWT 0.0°C HR EWT Sp 40.0°C HR EWT Dif 2.0°C HR Lock Limit 25.0°C HR Delta Sp 5.0°C HR 3-Way Valve 0.0%

Parameter	Range	Description
HR State	Off	Heat recovery is disabled
	Recirculation	Heat recovery pump is running, but chiller fan is not regulating the heat recovery water temperature
	Regulation	Heat recovery pump is running and chiller fans are regulating the heat recovery water temperature
HR LWT		Heat recovery leaving water temperature
HR EWT		Heat recovery entering water temperature
HR EWT Sp		Heat recovery entering water temperature setpoint value
HR EWT Dif		Heat recovery
HR Lock Limit
HR Delta Sp
HR 3-Way Valve		Heat recovery 3-way valve opening percentage
HR Pumps		Heat recovery pump state
HR Pump Hours		Heat recovery pump running hours
HR C1 Enable		Heat recovery enable on circuit 1
HR C2 Enable		Heat recovery enable on circuit 2

In case unit control source is "Network", to enable heat recovery functionality following conditions must be true:

• Enable the "HR C1 or C2 Enable" parameter in the Heat recovery page.
• Enable BMS register: Heat Recovery - Enable Setpoint

4.15 Rapid Restart

This chiller can activate a Rapid Restart (optional) sequence in reaction to a power failure. This option allows the unit to restore the load it had before the power failure in less time, reducing the standard cycle timer.

In order to Enable the Rapid Restart functionality, the customer must set to Yes the "Rapid Restart" parameter in the Rapid Restart page.

The feature is configured in the factory.

The 'Rapid Restart' page can be accessed navigating through Main Menu → View/Set Unit → Rapid Restart.

Info 6 View/Set Unit Thermostatic Control Network Control Pumps Rapid Restart Scheduler Date/Time Controller IP Setup Menu Password ESC OK

Info 6 Rapid Restart Rapid Restart No State C1 Not Active State C2 Not Active

The "State C1/2" represents the actual state of the Rapid Restart procedure for each circuit.

Rapid restart is activated under the following conditions:

• The power failure exists for up to 180 seconds
• The unit and circuit switches are ON
- No unit or circuit alarms exist
• The unit has been running in the normal Run state
• The BMS Circuit Mode setpoint is set to Auto when the control source is Network
- The ELWT isn't lower than the "ELWT Setpoint + StgUpDT"

- The ELWT is greater than the "ELWT Setpoint + NomEvapDT*Par_RpdRst", where Par_RpdRst is a parameter that can be modified

If the power failure is more than 180 seconds, the unit will start based on the standard cycle timer without Rapid Restart. After the power restart, the timers that are used during the Rapid Restart procedure are:

Parameter	Timer
Pump On	14s
1st Compr On	30s
Full Load (6 Compr)	180s

4.16 FreeCooling (Cooling Only)

The FreeCooling page can be accessed navigating through Main Menu → View/Set Unit → FreeCooling.

Info 4 View/Set Unit Thermostatic Control Free Cooling Network Control Pumps Scheduler Date/Time Controller IP Setup Daikin On Site ESC OK

Info 1 Free Cooling Free Cooling Enable FC Opt State Disabled State Off #1 Mode Mechanical #2 Mode Mechanical Fans Speed 0.0% Valves Circuit 1 Valves Circuit 2

Parameter	Range	Description
FC OPT State	Disable	The Option is not enabled with all the inputs necessary, or cannot run because thermodynamics issues
	Enable	The Option is correctly enabled
State	off	Unit's State in Off
	Free Cooling	Unit State in Free Cooling mode, both Circuits run in FreeCooling
	Mixed	Unit State in Mixed mode, one Circuit run in FreeCooling and the second run Mechanical mode
	Mechanical	Unit State in Mechanical mode, both Circuits run in Mechanical
#x Mode	Mechanical	The Circuit x is running in Mechanical mode
	FreeCooling	The Circuit x is running in FreeCooling mode
Fans Speed	0-100%	Percentage of fans speed controlled by FreeCooling
Command VA	Open	The opening output from the controller for the VA valve
	Closed	The closing output from the controller for the VA valve
Valve A Open	True	The Valve A is opened
	False	The Valve A is NOT opened
Valve A Closed	True	The Valve A is closed
	False	The Valve A is NOT closed

In order Enable the FreeCooling functionality, the customer must set to Enable the "Free Cooling" parameter in the FreeCooling page. The same parameter can be accessed on the Main Menu → Unit Enable:

Info 1 Unit Enable Unit Enable Circuit #1 Enable Circuit #2 Enable Free Cooling Enable

In the FreeCooling page, from View/Set Unit, the customer can visualize also some useful information, as:

• “#1 Mode” and “#2 Mode”: The operating mode of each circuit;
• "State": The operating mode of the entire unit.

Info 4 Free Cooling #1 Mode Mechanical #2 Mode Mechanical Fans Speed 20.0 % Valves Circuit 1 Valves Circuit 2 Command VA Open Valve A Open True Valve A Closed True

In this page is possible to navigate in the pages "valves circuit 1" and "valves circuit 2", and both contain:

Info 4 Free Cooling C1 State Off Command V1 Closed Command V3 Closed Command VB Open V1Open+V3Closed False V1Closed+V3Open False Valve B Open True Valve B Closed True

Figure 1 Valves Circuit 1

Parameter	Range	Description
State	Off	The Circuit is in Off State
	Switching	The Circuit is switching the valve in FreeCooling mode
	Regulation	The Circuit is running in FreeCooling and is regulating the Fan
	Pumpdown	The Circuit is in FreeCooling Pumpdown procedure
Command V1	Open	The opening output control from the controller for the V1 valve
	Closed	The closing output control from the controller for the V1 valve
V1open+V3Closed	True	The Valve V1 is opened AND the Valve V3 is closed
	False	The Valve V1 is NOT opened AND/OR the Valve V3 is NOT closed
V1Closed+V30pen	True	The Valve V1 is closed AND the Valve V3 is opened
	False	The Valve V1 is NOT closed AND/OR the Valve V3 is NOT opened
Command VA	Open	The opening output control from the controller for the VA valve
	Closed	The closing output control from the controller for the VA valve
Valve B Open	True	The Valve B is opened
	False	The Valve B is NOT opened
Valve B Closed	True	The Valve B is closed
	False	The Valve B is NOT closed

4.16.1 FreeCooling Switch

FreeCooling On/Off can be managed by the user using the selector SFC, placed in the electrical panel, which can switch between two positions: 0 - 1.

0

FreeCooling is disabled.

1

FreeCooling is enabled.

In order to enable the Unit to run in Free Cooling mode, both the FreeCooling Switch and the "Free Cooling" parameter, refer to 4.15, must be changed in the proper state.

4.16.2 Network On/Off

FreeCooling On/Off can be managed also with serial protocol, if the unit controller is equipped with one or more communication modules (BACNet, Modbus or LON). In order to control the unit over the network, follow below instructions:

1. SFC selector = 1 (refer to 4.16.1)
2. FreeCooling Enable = Enable (refer to 4.16)
3. Control Source = Network (refer to 4.5)
4. Close the contact Local/Network Switch (refer to 4.5), when required!

4.17 Collective Housing (Changeover Function, Heat Pump only)

It is requested the introduction of a feature that allows the automatic change of the operating mode of the unit, between heat-pump and chiller, depending on the temperature value read by a probe, that can be called "Changeover Probe", placed in the plant.

The scope of the Changeover function is to maintain the water temperature inside a specific range, desired for the plant, for example between 30^ C max and 20^ C minimum. If this temperature goes above 30^ C, the unit must change its operating mode in Cool, and cool the water under that value; the same if the temperature goes below 20^ C the unit must turn into Heat Pump in order to heat the water in the loop.

The thermoregulation logic follows the standard one on the ELWT probe, with also the StageUp, StageDn, StartUp and StopDn temperatures. But, for the Changeover function the software will look at the Changeover probe, to change the operating mode of the unit.

Called COWT = Changeover Water Temperature.

In order to maintain the normal logic of thermoregulation, in phases 1-2-3 the value of Start-Up permits the chiller to turn on in cool mode and cool the water till the Shut-dn temperature, where the unit shuts off the compressor and wait the load to turn on again.

Then, if the COWT < ChangeoverLowerLimit, the unit switches its operating mode into heat pump and heat the water up to Shut-Dn temperature Heat (Heat Sp + ShutDnDt), as in the phase 4. For thermoregulation, the unit switched to off and wait till the water goes below StartUp HeatValue to turn on again the compressor, as in phase 6.

Table below reports all parameters available in Collective Housing menu when Collective Hsng option is enabled.

HMI Path: Main Menu → View/Set Unit → Collective Hsng

Info 1 View/Set Unit Thermostatic Control Network Control Pumps Collective Hsng Scheduler Date/Time Controller IP Setup Daikin On Site ESC OK Info 1 Collective Housing CollectiveHsng En Yes CngOver Upper Lim 28.5°C CngOver Lower Lim 20.0°C WaterLow Lim 20.0°C WaterHigh Lim 30.0°C Coll Hsng Sp 25.0°C ESC OK

Setpoint/Sub Menu	Default	Range	Description
CollectiveHsng En	No	No-Yes	Enabling the changeover option
CngOver Upper Lim	28.0°C	See Figure a	Value for the Changeover Upper Limit, when the Unit switch to Cool
CngOver Lower Lim	20.0°C	See Figure a	Value for the Changeover Lower Limit, when the Unit switch to Heat
WaterLow Lim	20.0°C		Minimun water temperature that is allowed in the point where the changeover probes is placed
WaterHigh Lim	30.0°C		Maximum water temperature that is allowed in the point where the changeover probes is placed
Coll Hsng Sp	25.0°C		Setpoint that decided the starting condition of the unit when is switched ON, dependig on the COWT

The Temperature of the sensor that managed the Changeover Function, is visible also in the Main Menu, with the name "Cng Over Temp".

4.18 Domestic Hot Water

This function can be used to alternate normal unit operation with generation of domestic hot water. During "DHW" operation the unit is stopped, the water circuit is deviated by a 3 way valve and unit started on again to heat up a tank, containing the domestic hot water, until a the setpoint temperature is reached. At this point unit is switched back to normal operation.

This function expects a proper plant configuration and unit settings, please refer to specific documentation.

"Domestic hot water" function can be enabled by following the path Main Menu → Commission Unit → Configuration → options and set the DHW Enable parameter to Yes.

Notice that DHW is not compatible with Pump Control Mode VPF, DT and On-Off, Collective Housing and Bivalent Operation.

Additional features dedicated to Heating application like leaving water temperature setpoint control target based on DHW tank's temperature to guarantee a proper delta between Heat Pump's LWT and water inside tank and the automatic secondary fixed speed for DHW water loop to guarantee proper flow in the DHW loop are available.

Domestic Hot Water parameters can be configured in Main Menu → view/Set Unit → Domestic Hot water

Setpoint/Sub Menu	Default	Range	R/W	Description
DHW State	-	Disabled Start Switch To Regulation SwitchBack	R	DHW state of operation
DHW Setpoint	45 °C	0..70 °C	W	DHW setpoint request
DHW Start Db	5 °C	0..20 °C	W	DHW deadband for the request
DHW Delay	30 min	0..1440min	W	Delay for reactivation of the DHW after returning to the primary circuit
DHW Temperature		°C	R	DHW tank water temperature
DHW 3WV State		Start Switch EndError	R	DHW 3WV state of operation
DHW Alarm Code		0..3	R	DHW alarm code
DHW 3wV Type	2Fdbck	2Fdbck Temporized	W	DHW type of 3WV
DHW 3wV Switch time	300 s	0...900 s	W	DHW 3WV temporized time of switching
DHW Max Time	30 min	0..1440min	W	DHW max time of regulation in secondary circuit
DHW Standby Mode	off	Off On	W	With standby mode On the 3WV is always connected in the secondary circuit.
DHW Remote En	off	Off On	W	DHW remote enable
DHW Lwt Ctrl Target	off	Off On	W	DHW lwt control target based on tank temperature
DHW Secondary FixSpd	off	Off On	W	DHW secondary fixed speed for DHW water loop to guarantee proper flow in the DHW loop.

In case unit control source is "Network", to enable domestic hot water functionality following conditions must be true:

The Bivalent Operation function allows the unit to manage the activation of a boiler with enabling/disabling as a function of the climatic curve of the system, set on the UC in an identical manner to the curve of the system present in the boiler, and of the outside ambient temperature.

"Bivalent Operation" function can be enabled by following the path Main Menu → Commission Unit → Configuration → options and set the Bivalent Operation parameter to Yes.

Setpoint/Sub Menu	Default	Range	R/W	Description
(Bivalent Ops En)	Off	Off/On	W	Allows bivalent operation mode to start.
(Tamb Design)	0	-20...60	W	Defines design ambient temperature for the system.
(System Lwt Design)	60	20...75	W	Defines system leaving water temperature target for the system at design ambient temperature.
(System Lwt@20)	30	20...75	W	Defines system leaving water temperature target for the system at 20°C ambient temperature.
(Tcut-off)	0	-7...7	W	Defines lower limit for bivalent operation under which only boiler is enabled.
(Tbivalent)	7	0...20	W	Defines higher limit for bivalent operation over which only heat-pump is enabled.Is it possible to have transition with boiler active even if OAT >Tambient.
(System DeltaT)	10	0...50	W	This parameter shall match the exact delta temperature drop due to system load.
(Boiler Delay)	0	0...60	W	Defines activation delay between heat-pump and boiler in bivalent operation OAT range.

Additional feature dedicated to Bivalent operation like system leaving water temperature setpoint received by a remote control is possible to be enable by following the path Main Menu → Commission Unit → Configuration → Options and set the Biv Syst Lwt Ctrl parameter to Remote.

Moreover it's also possible configured the sensor type of the remote Lwt control, if 0-10 V or 4-20 mA.

Main Menu → Commission Unit → Configuration → Options

Setpoint/Sub Menu	Default	Range	R/W	Description
Buv Syst Lwt Ctrl	Local	Local Remote	W	Defines the type of System Lwt control
Bivalent Sns Type	0-10V	0-10V 4-20mA	W	Defines the sensor type of the System Lwt remote control.

Bivalent Operation plants

Due to the boiler capability to deliver water temperatures out of maximum unit envelope it's necessary to pay attention to water loop realization in order to guarantee entering temperatures inside the limit and use the heat pump safely and prevent any component damaging.

4.20 Software Options

For the EWYT model, the possibility to employ a set of software options has been added to the functionality of the chiller, in according with the new Microtech 4 installed on the Unit. The Software Options do not require any additional hardware and regard communication channels and the new energy functionalities.

During the commissioning the machine is delivered with the Option Set chosen by the customer; the Password inserted is permanent and depends on the Serial Machine Number and the Option Set selected.

In order to check the current Option Set:

Main MenuCommission Unit→Configuration→Software Options.

Name Refresh Show/Hide trend Logout Info 1 Configuration Unit Options Software Options

Home Refresh ShowSlide bend Layout Info 1 Software Options Apply Changes No Password Value 1-Modbus Slave MSTP Off 1-State Off 2-BACNet MSTP Off 2-State Off 3-BACNet IP Off 3-State Off ESC OK

Parameter	Description
Password	Writable by Interface/Web Interface
Option Name	Option Name
Option Status	Option is activated.Option is not activated

The Current Password inserted activates the selected options.

4.20.1 Changing the Password for buying new Software Options

The Option Set and the Password are updated in the Factory. If the customer wants to change its Option Set, he needs to contact the Daikin Personnel and asks for a new password.

As soon as the new password is communicated, the follow steps allow the customer to change the Option Set by himself:

1. Wait for the circuits are both OFF, then, from the Main Page, Main Menu→Unit Enable→Unit→Disable
2. Go to Main Menu→Commission Unit→Configuration→Software Options
3. Select the Options to Activate
4. Insert the Password
5. Wait for the States of the selected options going to On
6. Apply Changes→Yes (it will reboot the controller)

The Password is changeable only if the machine is working in safe conditions: both the circuits are in the State Off.

4.20.2 Inserting the Password in a Spare Controller

If the Controller is broken and/or it needs to be replaced for any reason, the customer needs to configure the Option Set with a new Password.

If this replacement is scheduled, the customer can ask to Daikin Personnel for a new Password and repeat the steps in chapter 4.17.1.

If there is no enough time to ask for a Password to Daikin Personnel (ex. an expected failure of the controller), a set of Free Limited Password is provided, in order not to interrupt the machine's working.

These Passwords are free and visualized in:

Main Menu→Commission Unit→Configuration→Software Options→Temporary Passwords

Home Refresh Show/Side Icon Info 1 Software Options 4-Energy Monitoring Off 4-State Off 5-iCM Standard Off 5-State Off 6-iCM Advanced Off 6-State Off Temporary Passwords Apply Changes No ESC OK

Home Relebs Showable level Logout Info 1 Temporary Passwords 1-553489691893 Not Used 2-411486702597 Not Used 3-084430952438 Not Used Mode Permanent Timer 0min ESC OK

Their Use is limited up to three months:

• 553489691893 – 3 Months Duration
• 411486702597 – 1 Month Duration
• 084430952438 – 1 Month Duration

It gives the customer the time enough to contact Daikin Service and insert a new unlimited password.

Parameter	Specific Status	Description
553489691893		Activate the Option Set for 3 Months.
411486702597		Activate the Option Set for 1 Month.
084430952438		Activate the Option Set for 1 Month.
Mode	Permanent	A permanent Password is inserted. Option set can be used for unlimited time.
Temporary		A temporary Password is inserted. Option set can be used depending on the password inserted.
Timer		Last duration of the Option Set activated. Enabled only if the mode is Temporary

The Password is changeable only if the machine is working in safe conditions: both the circuits are in the State Off.

4.20.3 Modbus MSTP Software Option

When the software option "Modbus MSTP" is activated and the controller is restarted, the communication protocol settings page can be accessed via the path:

Main Menu→Commission Unit→SW Modbus MSTP

Home Refresh Showhide bread Layout Info 1 Commission Unit Configuration Alarm Limits Manual Control Input/Output Sensors Calibration SW Modbus MSTP Scheduled Maintenance

The values that can be set are the same as those found on the Modbus MSTP option page with the relative driver, and depend on the specific system where the unit is installed.

Info 1 Modbus MSTP Address 1 Baudrate 19200 Parity None 2StopBits No Delay 100 Response Timeout 100 ESC OK

To establish the connection, the RS485 port to use is the one on the T14 terminal of the MT4 controller.

4.20.4 BACNET MSTP

When the software option "BACNet MSTP" is activated and the controller is restarted, the communication protocol settings page can be accessed via the path:

Main Menu→Commission Unit→SW BACNet MSTP

Home Refresh ShowHide trend Layout Info 1 Commission Unit Configuration Alarm Limits Manual Control Input/Output Sensors Calibration SW BACNet MSTP Scheduled Maintenance

The values that can be set are the same as those found on the BACNet MSTP option page with the relative driver, and depend on the specific system where the unit is installed.

Info 1 BACNet MSTP Device Instance 1 Name Value Status NoActivePo Address 0 Baudrate 38400 Max Master 1 Max Info Frame 1 Unit System 0 ESC OK

4.20.5 BACNET IP

When the software option "BACNet IP" is activated and the controller is restarted, the communication protocol settings page can be accessed via the path:

Main Menu→Commission Unit→SW BACNet IP Home Refresh ShowHide Trend Layout Info 1 Commission Unit Configuration Alarm Limits Manual Control Input/Output Sensors Calibration SW BACNet IP Scheduled Maintenance

The values that can be set are the same as those found on the BACNet MSTP option page with the relative driver, and depend on the specific system where the unit is installed.

Info 1 BACNet IP Device ID 1 Name Value Status OK UDP Port 47808 Unit System 0 Act IP= 192.168.001.042 Act Msk= 255.255.255.000 Act Gwv= 192.168.001.001 ESC OK

The port for LAN connection to be used for BACNet IP communication is the T-IP Ethernet port, the same one used for remote control of the controller on the PC.

4.20.6 PERFORMANCE MONITORING

The Energy Monitoring is a software option not requiring any additional hardware. It can be activated in order to achieve an estimation of the instantaneous performances of the chiller in terms of:

• Cooling Capacity or Heating Capacity
- Power Input
• EER-COP in Cooling or Heating mode

An integrated estimation of these quantities is provided. Go to the page:

Main Menu→View / Set Unit→Energy Monitoring

View/Set Unit Thermostatic Control Network Control Pumps Energy Monitoring Scheduler Date/Time Controller IP Setup Daikin On Site

Info 4 Energy Monitoring Power Input 0.0kW Cooling Capacity 0.0kW Heating Capacity 0.0kW EER 0.0 COP 0.0 Integrated Power Input 0.0MWh Integrated Cooling Cap ESC

Info 4 Power Input Circuit 1 0.0kW Circuit 2 0.0kW PI Pump 0.0kW ESC OK

Info 4 Cooling Capacity Circuit 1 0.0kW Circuit 2 0.0kW ESC OK

Info 4 Heating Capacity Circuit 1 0.0kW Circuit 2 0.0kW ESC OK

The BEG page can be accessed navigating through Main Menu → view/Set Unit → BEG

In BEG page as described above, it's possible to navigate and reset the internal database storing monitored energies of last 24 month.

Page	Parameter	Range	Description	R/W	Psw
[28](BEG)	(EM Index)	0..72	The index selected defines the actual value displayed EM Value parameter.Cool Energy, Heat Energy e Power Input values are continuously added to actual month value. Last 24 energies value are available. In particular:1-8 = CoolEnergy [month 1-8]9-16 = ElectEnergy [month 1-8]17-24 = CoolEnergy [month 9-16]25-32 = ElectEnergy [month 9-16]33-40 = CoolEnergy [month 17-24]41-48 = ElectEnergy [month 17-24]49-64 =HeatEnergy [month 1-16]65-72 = HeatEnergy [month 17-24]	W	1
	(EM Value)	0.0...9999	The value displayed match with the description of value associated to parameter “[28.00] (EM Index)".	R	1
	(EM Reset)	Off = PassiveOn = Active	Command reset for energy monitoring database. Resets all stored values to zero and sets actual date as reference for“month 1” values. After a reset month 1’s CoolEnergy, HeatEnergy and ElectEnergy will start to be updated depending on actual unite operations.	W	1

First start

For correct initialization of the Energy Monitoring function, a Reset command shall be done immediately before the first start-up of the unit; otherwise, database will be populated with values that do not respect the expected order.

Date reference

A reset command set the reference date for database. Changing data backward will cause and invalid state and database won't be updated until reference date it reached again. Changing data forward will cause a non-reversible shift of reference date and every database's cell from old reference date to actual one will be filled with a 0-value.

4.20.7 Cascade

When the software option "Cascade System" is activated and the controller is restarted, the communication protocol settings page can be accessed via the path:

Main Menu→ Cascade

Info 1 Main Menu Enter Password View/Set Unit View/Set Circuit Unit Status Off:Unit Alarm Cascade Setpoint 7.0°C Evaporator LWT 0.0°C

Info 1 Cascade Data Settings Maintenance Configuration Version 1.00 ESC OK

A Cascade system enable the heat production by water cooled unit supported by air cooled unit on evaporator side.

For more detailed information in Cascade menu, referring to the Cascade Management option.

4.21 Smart Grid Application

The SG page can be accessed navigating through Main Menu → View/Set Unit → SG

In case of Smart Grid operations (SG Box connected and smart grid functionalities enabled) actual state read by the gateway is available too, otherwise value is fixed at zero.

(SG State)

0...4

The value represents the actual state sent by SG Gateway:0 = SG Disabled/SG Box Communication Error1 = (Bypass scheduler to force off)2 = (Normal Operation)3 = (Force Setpoint2)4 = (Bypass scheduler to enable) & (Force setpoint2)

R

1

For further information eg: M/S Multi-Units case, configuration notes can be found in Smart Grid Ready Box Installation & Operating Manual D-EIOCP00301-23.

The UC protects the unit and the components from operating in abnormal conditions. Protections can be divided in preventions and alarms. Alarms can then be divided in pump-down and rapid stop alarms. Pump-down alarms are activated when the system or sub-system can perform a normal shutdown in spite of the abnormal running conditions. Rapid stop alarms are activated when the abnormal running conditions require an immediate stop of the whole system or sub-system to prevent potential damages.

The UC displays the active alarms in a dedicated page and keep an history of the last 50 entries divided between alarms and acknowledges occurred. Time and date for each alarm event and of each alarm acknowledge are stored.

The UC also stores alarm snapshot of each alarm occurred. Each item contains a snapshot of the running conditions right before the alarm has occurred. Different sets of snapshots are programmed corresponding to unit alarms and circuit alarms holding different information to help the failure diagnosis.

In the following sections it will also be indicated how each alarm can be cleared between local HMI, Network (by any of the high-level interfaces Modbus, Bacnet or Lon) or if the specific alarm will clear automatically.

5.1 Unit Alerts

All events reported in this section does not produce a unit stop, but only a visual information and an item in the alarm log.

5.1.1 BadLWTReset - Bad Leaving Water Temperature Reset Input

This alarm is generated when the Setpoint Reset option has been enabled and the input to the controller is out of the admitted range.

Symptom	Cause	Solution
Unit status is Run.Bell icon is moving on controller's display.LWT Reset function cannot be used.String in the alarm list:BadLwTResetString in the alarm log:± BadLwTResetString in the alarm snapshotBadLwTReset	LWT reset input signal is out of range.For this warning out of range is considered to be a signal less than 3mA or more than 21mA.	Check for values of input signal to the unit controller. It has to be in the allowed mA range.
		Check for electrical shielding of wirings.
		Check for right value of the unit's controller output in case input signal is into allowed range.
Reset
Local HMINetworkAuto	☐☐☑

5.1.2 EnergyMeterComm - Energy Meter Communication Fail

This alarm is generated in case of communication problems with the energy meter.

Symptom	Cause	Solution
Bell icon is moving on controller's display. String in the alarm list: EnergyMeterComm String in the alarm log: ± EnergyMtrComm String in the alarm snapshot EnergyMtrComm	Module has no power supply	Refer to the datasheet of the specific component to see if it is correctly powered.
	Wrong cabling with the Unit Controller	Check if the polarity of the connections is respected.
	Modbus parameters not properly set	Referring to the datasheet of the specific component to see if the modbus parameters are set correctly: Address = 20 Baud Rate = 19200 kBs Parity = None Stop bits =1
	Module is broken	Check if the display shows something and the power supply is present.
Reset
Local HMI Network Auto	☐ ☐ ☑

5.1.3 SmartGridComm – Smart Grid Communication Fail

This alarm is generated in case of communication problems with the energy meter.

Symptom	Cause	Solution
Bell icon is moving on controller's display.String in the alarm list:	Module has no power supply	Refer to the datasheet of the specific component to see if it is correctly powered.
SmartGridCommString in the alarm log:± SmartGridCommString in the alarm snapshotSmartGridComm	Wrong cabling with the Unit Controller	Check if the polarity of the connections is respected.
	Modbus parameters not properly set	Referring to the datasheet of the specific component to see if the modbus parameters are set correctly.
	Module is broken	Check if the display shows something and the power supply is present.
Reset
Local HMINetworkAuto	☐☐☑

5.1.4 EvapPump1Fault - Evaporator Pump #1 Failure

This alarm is generated if the pump is started but the flow switch is not able to close within the recirculate time. This can be a temporary condition or may be due to a broken flowswitch, the activation of circuit breakers, fuses or to a pump breakdown.

Symptom	Cause	Solution
Unit could be ON.Bell icon is moving on controller's display.Backup pump is used or stop of all circuits in case of pump #2 failure.String in the alarm list:EvapPump1FaultString in the alarm log:± EvapPump1FaultString in the alarm snapshotEvapPump1Fault	Pump #1 may not be operating.	Check for problem in electrical wiring of the pump #1.
		Check that electrical breaker of pump #1 is tripped.
		If fuses are used to protect the pump, check the integrity of fuses.
		Check for problem in wiring connection between pump starter and unit controller.
		Check the water pump filter and the water circuit for obstructions.
	Flow Switch doesn't operate properly	Check flow switch connection and calibration.
Reset
Local HMINetworkAuto	☑☑☐

5.1.5 BadDemandLimit - Bad Demand Limit Input

This alarm is generated when the Demand Limit option has been enabled and the input to the controller is out of the admitted range.

Symptom	Cause	Solution
Unit status is Run.Bell icon is moving on controller's display.Demand Limit function cannot be used.String in the alarm list:BadDemandLimitInputString in the alarm log:±BadDemandLimitInputString in the alarm snapshotBadDemandLimitInput	Demand limit input out of range. For this warning out of range is considered to be a signal less than 3mA or more than 21mA.	Check for values of input signal to the unit controller. It has to be in the allowed mA range.
		Check for electrical shielding of wirings.
		Check for right value of the unit's controller output in case input signal is into allowed range.
Reset		Notes
Local HMINetworkAuto	☐☐☑	Automatically clears when the signal returns in the allowed range.

5.1.6 EvapPump2Fault - Evaporator Pump #2 Failure

This alarm is generated if the pump is started but the flow switch is not able to close within the recirculate time. This can be a temporary condition or may be due to a broken flowswitch, the activation of circuit breakers, fuses or to a pump breakdown.

Symptom	Cause	Solution
Unit could be ON.Bell icon is moving on controller's display.	Pump #2 may not be operating.	Check for problem in electrical wiring of the pump #2.
		Check that electrical breaker of pump #2 is tripped.If fuses are used to protect the pump, check the integrity of fuses.
Backup pump is used or stop of all circuits in case of pump #1 failure. String in the alarm list:EvapPump2FaultString in the alarm log:± EvapPump2FaultString in the alarm snapshotEvapPump2Fault
		Check for problem in wiring connection between pump starter and unit controller.
		Check the water pump filter and the water circuit for obstructions.
	Flow Switch doesn't operate properly	Check flow switch connection and calibration.
Reset
Local HMINetworkAuto - Reset	☑☑☐

5.1.7 Switch Box Temperature sensor fault

This alarm is generated any time that the input resistance is out of an acceptable range.

Symptom	Cause	Solution
Unit status is OnBell icon is moving on controller's display.Bell icon is moving on controller's display.String in the alarm list:SwitchBoxTempSenString in the alarm log:± SwitchBoxTempSenString in the alarm snapshotSwitchBoxTempSen	Sensor is broken.	Check for sensor integrity according table and allowed kOhm (kΩ) range.
		Check correct sensors operation
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for absence of water or humidity on electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset		Notes
Local HMINetworkAuto	☑☑☐

5.1.8 ExternalEvent - External Event

This alarm indicates that a device, whose operation is linked with this machine, is reporting a problem on the dedicated input.

Symptom	Cause	Solution
Unit status is Run.Bell icon is moving on controller's display.String in the alarm list:External EventString in the alarm log:±ExternalEventString in the alarm snapshotExternalEvent	There is an external event that has caused the opening, for at least 5 seconds, of the digital input on the controller board.	Check for reasons of external event and if it can be a potential problem for a correct chiller operation.
Reset
Local HMINetworkAuto	☐☐☑

5.1.9 HeatRec EntWTempSen - Heat Recovery Entering Water Temperature sensor fault

This alarm is generated any time that the input resistance is out of an acceptable range.

Symptom	Cause	Solution
Heat Recovery is OffBell icon is moving on controller's display.String in the alarm list:HeatRec EntwTempSenString in the alarm log:± HeatRec EntwTempSenString in the alarm snapshotHeatRec EntwTempSen	Sensor is broken.	Check for sensor integrity according table and allowed kOhm (kΩ) range.
		Check correct sensors operation
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for absence of water or humidity on electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.

Reset
Local HMI	☑
Network	☑
Auto	☑

5.1.10 HeatRec LvgWTempSen - Heat Recovery Leaving Water Temperature sensor fault

This alarm is generated any time that the input resistance is out of an acceptable range.

Symptom	Cause	Solution
Heat Recovery is OffBell icon is moving on controller's display.String in the alarm list:HeatRec LvgwTempSenString in the alarm log:± HeatRec LvgwTempSenString in the alarm snapshotHeatRec LvgwTempSen	Sensor is broken.	Check for sensor integrity according table and allowed kOhm (kΩ) range.
		Check correct sensors operation
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for absence of water or humidity on electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.1.11 HeatRec FreezeAlm - Heat Recovery Water Freeze Protect alarm

This alarm is generated to indicate that the heat recovery water temperature (entering or leaving) has dropped below a safety limit. Control tries to protect the heat exchanger starting the pump and letting the water circulate.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:HeatRec FreezeAlmString in the alarm log:± HeatRec FreezeAlmString in the alarm snapshotHeatRec FreezeAlm	Water flow too low.	Increase the water flow.
	Inlet temperature to the heat recovery is too low.	Increase the inlet water temperature.
	Sensors readings (entering or leaving) are not properly calibrated	Check the water temperatures with a proper instrument and adjust the offsets
Reset
Local HMINetworkAuto	☑☐☐

5.1.12 Option1BoardComm – Optional board 1 communication fail

This alarm is generated in case of communication problems with the AC module.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:Option1BoardCommString in the alarm log:± Option1BoardCommString in the alarm snapshotOption1BoardComm	Module has no power supply	Check the power supply from the connector on the side of the module.
		Check if LEDs are both green.
		Check if the connector on the side is tightly inserted in the module
	Module address is not properly set	Check if module's address is correct referring to the wiring diagram.
	Module is broken	Check if LED are on and both green.If BSP LED is solid red replace the module
		Check if power supply is ok but LEDs are both off. In this case replace the module
Reset
Local HMINetworkAuto	☐☐☑

5.1.13 Option2BoardComm - Optional board 2 communication fail

This alarm is generated in case of communication problems with the AC module.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:Option2BoardCommString in the alarm log:± Option2BoardCommString in the alarm snapshotOption2BoardComm	Module has no power supply	Check the power supply from the connector on the side of the module.
		Check if LEDs are both green.
		Check if the connector on the side is tightly inserted in the module
	Module address is not properly set	Check if module's address is correct referring to the wiring diagram.
	Module is broken	Check if LED are on and both green.If BSP LED is solid red replace the module
		Check if power supply is ok but LEDs are both off. In this case replace the module
Reset
Local HMINetworkAuto	☐☐☑

5.1.14 Option3BoardComm – Optional board 3 communication fail

This alarm is generated in case of communication problems with the AC module, related with the FreeCooling option.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:Option3BoardCommString in the alarm log:± Option3BoardCommString in the alarm snapshotOption3BoardComm	Module has no power supply	Check the power supply from the connector on the side of the module.
		Check if LEDs are both green.
		Check if the connector on the side is tightly inserted in the module
	Module address is not properly set	Check if module's address is correct referring to the wiring diagram.
	Module is broken	Check if LED are on and both green.If BSP LED is solid red replace the module
		Check if power supply is ok but LEDs are both off. In this case replace the module
Reset
Local HMINetworkAuto	☐☐☑

5.1.15 EvapPDSen – Evaporator Pressure Drop sensor fault

This alarm indicates that the evaporator pressure drop transducer is not operating properly. This transducer is used only with Pump Control VPF.

Symptom	Cause	Solution
Pump speed is set with Backup value.Bell icon is moving on controller's display.String in the alarm list:EvapPDSenString in the alarm log:± EvapPDSenString in the alarm snapshotEvapPDSen	Sensor is broken.	Check for sensor integrity.Check correct sensors operation according information about mVolt (mV) range related to pressure values in kPa.
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for correct installation of the sensor on refrigerant circuit pipe. The transducer must be able to sense the pressure through the valve's needle.
		Check for absence of water or humidity on sensor electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetwork	☑☑☑

Auto

5.1.16 LoadPDSen - Load Pressure Drop sensor fault

This alarm indicates that the loa pressure drop transducer is not operating properly. This transducer is used only with Pump Control VPF.

Symptom	Cause	Solution
Pump speed is set with Backup value.Bell icon is moving on controller's display.String in the alarm list:LoadPDSenString in the alarm log:± LoadPDSenString in the alarm snapshotLoadPDSen	Sensor is broken.	Check for sensor integrity.Check correct sensors operation according information about mVolt (mV) range related to pressure values in kPa.
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for correct installation of the sensor on refrigerant circuit pipe. The transducer must be able to sense the pressure through the valve's needle.
		Check for absence of water or humidity on sensor electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.1.17 DHW WaterTmpSen – Domestic Hot Water Temperature sensor fault (Heat Pump Only)

This alarm is generated any time that the input resistance is out of an acceptable range. This sensor is present only when the Domestic Hot Water option is enabled.

Symptom	Cause	Solution
Unit status is Off.Bell icon is moving on controller's display.String in the alarm list:DHW WaterTmpSenString in the alarm log:± DHW WaterTmpSenString in the alarm snapshotDHW WaterTmpSen	Sensor is broken.	Check for sensor integrity according table and allowed kOhm (kΩ) range.
		Check correct sensors operation
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for absence of water or humidity on electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.1.18 BivSystLwtRemAlm-Bivalent System LWT Remote Alarm (Heat Pump Only)

This alarm is generated when the Bivalent option has been enabled and the input to the controller is out of the admitted range.

Symptom	Cause	Solution
Unit status is Run.Bell icon is moving on controller's display.String in the alarm list:BivSystLwtRemAlmString in the alarm log:± BivSystLwtRemAlmString in the alarm snapshotBivSystLwtRemAlm	Demand limit input out of range. For this warning out of range is considered to be a signal less than 2mA (or -1V) or more than 22mA (or 11V)	Check for values of input signal to the unit controller. It has to be in the allowed mA range.
		Check for electrical shielding of wirings.
		Check for right value of the unit's controller output in case input signal is into allowed range.
Reset		Notes
Local HMINetworkAuto	□□☑	Automatically clears when the signal returns in the allowed range.

5.2 Unit Pumpdown Alarms

All alarms reported in this section produce a unit stop performed following normal pumpdown procedure.

5.2.1 UnitOff EvpEntWTempSen - Evaporator Entering Water Temperature (EWT) sensor fault

This alarm is generated any time the input resistance is out of an acceptable range.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped with a normal shutdown procedure.Bell icon is moving on controller's display.String in the alarm list:UnitOff EvpEntwTempSenString in the alarm log:± UnitOff EvpEntwTempSenString in the alarm snapshotUnitOff EvpEntwTempSen	Sensor is broken.	Check for sensor integrity according table and allowed kOhm (kΩ) range.
		Check correct sensors operation
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for absence of water or humidity on electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.2.2 UnitOffLvgEntWTempSen - Evaporator Leaving Water Temperature (LWT) sensor fault

This alarm is generated any time that the input resistance is out of an acceptable range.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped with a normal shutdown procedure.Bell icon is moving on controller's display.String in the alarm list:UnitOffLvgEntwTempSenString in the alarm log:± UnitOffLvgEntwTempSenString in the alarm snapshotUnitOffEvpLvgWTempSen	Sensor is broken.	Check for sensor integrity according table and allowed kOhm (kΩ) range.
		Check correct sensors operation
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for absence of water or humidity on electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.2.3 UnitOffAmbTempSen - Outside Air Temperature sensor fault

This alarm is generated any time the input resistance is out of an acceptable range.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped with a normal shutdown procedure.Bell icon is moving on controller's display.String in the alarm list:UnitOffAmbTempSenString in the alarm log:± UnitOffAmbTempSenString in the alarm snapshotUnitOffAmbTempSen	Sensor is broken.	Check for sensor integrity.
		Check correct sensors operation according table and allowed kOhm (kΩ) range.
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for absence of water or humidity on electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.2.4 OAT: Lockout - Outside Air Temperature (OAT) Lockout (only in Cooling Mode)

This alarm prevents the unit to start if the outside air temperature is too low. Purpose is to prevent low pressure trips at startup. The limit depends on the fan regulation that is installed on the unit. By default this value is set to 10^ C.

Symptom	Cause	Solution
Unit Status is OAT Lockout.All circuits are stopped with a normal shutdown procedure.Bell icon is moving on controller's display.String in the alarm list:StartInhbtAmbTempLoString in the alarm log:± StartInhbtAmbTempLoString in the alarm snapshotStartInhbtAmbTempLo	Outside ambient temperature is lower than value set into unit's controller.	Check the minimum outside ambient temperature value set into the unit's controller.
		Check if this value is in accordance with chiller application, therefore check about the proper application and utilization of the chiller.
	Improper operation of Outside Ambient Temperature sensor.	Check for proper operation of OAT sensor according information about kOhm (kΩ) range related to temperature values.
Reset		Notes
Local HMINetworkAuto	☐☐☑	It clears automatically with a 2.5°C of hysteresis.

5.2.5 UnitOff CollHsngWTempSen – Collective Housing Water Temperature (LWT) sensor fault (Heat Pump Only) This alarm is generated any time that the input resistance is out of an acceptable range. This sensor is present only when the Collective Housing option is enabled, and when the plant hasn't an iCM or Master/Slave control.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped with a normal shutdown procedure.Bell icon is moving on controller's display.String in the alarm list:Unitoff CollHsngwTempSenString in the alarm log:± Unitoff CollHsngwTempSenString in the alarm snapshotUnitoff CollHsngwTempSen	Sensor is broken.	Check for sensor integrity according table and allowed kOhm (kΩ) range.
		Check correct sensors operation
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for absence of water or humidity on electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.3 Unit Rapid Stop Alarms

All alarms reported in this section produce an instantaneous stop of the unit.

5.3.1 Power Failure - Power Failure (only for units with the UPS option)

This alarm is generated when the main power is Off and the unit controller is powered by the UPS.

Resolution of this fault requires a direct intervention on the power supply of this unit. Direct intervention on the power supply can cause electrocution, burns or even death. This action must be performed only by trained persons. In case of doubts contact your maintenance company.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:Power FaultString in the alarm log:± Power FaultString in the alarm snapshotPower Fault	Loss of one phase.	Check voltage level on each of the phases.
	Not correct sequence connection of L1,L2,L3.	Check sequence of L1, L2, L3 connections according indication on chiller's electrical scheme.
	Voltage level on the unit's panel is not in the allowed range (±10%).	Check that voltage level on each phases is into the allowed range that is indicated on the chiller label.Is important to check the voltage level on each phases not only with chiller not running, but mainly with chiller running from minimum capacity up to full load capacity. That's because voltage drop can occur from a certain unit cooling capacity level, or becauseof certain working condition (i.e. high values of OAT).In these cases the issue can be related with the sizing of power cables.
	There is a short-circuit on the unit.	Check for correct electrical isolation condition of each unit's circuit with a Megger tester.
Reset		Notes
Local HMI Network Auto	☑☑

5.3.2 UnitOff EvapFreeze - Evaporator Water Temperature Low alarm

This alarm is generated to indicate that the water temperature (entering or leaving) has dropped below a safety limit.

Control tries to protect the heat exchanger starting the pump and letting the water circulate.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:UnitOff EvapWaterTmpLowString in the alarm log:± UnitOff EvapWaterTmpLowString in the alarm snapshotUnitOff EvapWaterTmpLow	Water flow too low.	Increase the water flow.
	Inlet temperature to the evaporator is too low.	Increase the inlet water temperature.
	Flow switch is not working or no water flow.	Check the flow switch and the water pump.
	Sensors readings (entering or leaving) are not properly calibrated.	Check the water temperatures with a proper instrument and adjust the offsets
	Wrong freeze limit setpoint.	The freeze limit has not been changed as a function of glycol percentage.
Reset
Local HMINetworkAuto	☑☐☑

5.3.3 UnitOff ExternalAlarm - External alarm

This alarm is generated to indicate that an external device whose operation is linked with this unit operation. This external device could be a pump or an inverter.

Symptom	Cause	Solution
Unit status is Off.All circuits are switched off with the normal shutdown procedure.Bell icon is moving on controller's display.String in the alarm list:UnitOff ExternalAlarmString in the alarm log:± UnitOff ExternalAlarmString in the alarm snapshotUnitOff ExternalAlarm	There is an external event that has caused the opening, for at least 5 seconds, of the port on the controller board.	Check causes of the external event or alarm.
		Check electrical wiring from unit controller to the external equipment in case of any external events or alarms have been occurred.
Reset
Local HMINetworkAuto	☐☐☑

5.3.4 UnitOff PVM - PVM

This alarm is generated in case of problems with the power supply to the chiller.

Resolution of this fault requires a direct intervention on the power supply of this unit. Direct intervention on the power supply can cause electrocution, burns or even death. This action must be performed only by trained persons. In case of doubts contact your maintenance company.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:	Loss of one phase.	Check voltage level on each of the phases.
	Not correct sequence connection of L1, L2, L3.	Check sequence of L1, L2, L3 connections according indication on chiller's electrical scheme.
Unitoff PVMString in the alarm log:± Unitoff PVMString in the alarm snapshotUnitoff PVM	Voltage level on the unit's panel is not in the allowed range (±10%).	Check that voltage level on each phases is into the allowed range that is indicated on the chiller label.Is important to check the voltage level on each phases not only with chiller not running, but mainly with chiller running from minimum capacity up to full load capacity. That's because voltage drop can occur from a certain unit cooling capacity level, or because of certain working condition (i.e. high values of OAT).In these cases the issue can be related with the sizing of power cables.
	There is a short-circuit on the unit.	Check for correct electrical isolation condition of each unit's circuit with a Megger tester.
Reset
Local HMINetworkAuto	☐☐☑

5.3.5 UnitOff EvapWaterFlow - Evaporator Water Flow Loss alarm

This alarm is generated in case of flow loss to the chiller to protect the machine against freezing.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:UnitOff EvapWaterFlowString in the alarm log:± UnitOff EvapWaterFlowString in the alarm snapshotUnitOff EvapWaterFlow	No water flow sensed for 3 minutes continuously or water flow too low.	Check the water pump filler and the water circuit for obstructions.
		Check the flow switch calibration and adapt to minimum water flow.
		Check if pump impeller can rotate freely and has no damages.
		Check pumps protection devices (circuit breakers, fuses, inverters, etc.)
		Check if water filter is clogged.
		Check flow switch connections.
Reset
Local HMINetworkAuto	☑☑☐

5.3.6 UnitOff EXVDriverComm - EXV Driver Extension Communication Error

This alarm is generated in case of communication problems with the EEXV module.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:UnitOff EXVDriverCommString in the alarm log:± UnitOff EXVDriverCommString in the alarm snapshotUnitOff EXVDriverComm	Module has no power supply	Check the power supply from the connector on the side of the module.
		Check if LEDs are both green.
		Check if the connector on the side is tightly inserted in the module
	Module address is not properly set	Check if module's address is correct referring to the wiring diagram.
	Module is broken	Check if LED are on and both green.If BSP LED is solid red replace the module
		Check if power supply is ok but LEDs are both off. In this case replace the module
Reset
Local HMINetworkAuto	☑☑☐

5.3.7 UnitOff Option4BoardComm – Optional board 4 communication fail

This alarm is generated in case of communication problems with the AC module.

Symptom	Cause	Solution
Unit status is Off.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:Option4BoardCommString in the alarm log:± Option4BoardCommString in the alarm snapshotOption4BoardComm	Module has no power supply	Check the power supply from the connector on the side of the module.
		Check if LEDs are both green.
		Check if the connector on the side is tightly inserted in the module
	Module address is not properly set	Check if module's address is correct referring to the wiring diagram.
	Module is broken	Check if LED are on and both green.If BSP LED is solid red replace the module
		Check if power supply is ok but LEDs are both off. In this case replace the module
Reset
Local HMINetworkAuto	☐☐☑

5.3.8 DHW 3WVAlarm – Domestic Hot Water 3 Way Valve Alarm (Heat pump only)

This alarm is generated if the 3WV for DHW is fault or damaged. The 3WV is not able to do the changeover to the secondary or primary loop. A 3WV fault can be related to connection/wiring issue or to component break up and are available only in temporized valve configuration.

Symptom	Cause	Solution
Unit could be ON.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:DHw 3wVAlarmString in the alarm log:± DHw 3wVAlarmString in the alarm snapshotDHw 3wVAlarm	Errors in sensor wiring/connection	Check valve's cablingCheck 3WV.
Reset
Local HMINetworkAuto	☑☑☐

5.3.9 UnitOff WaterOverHeat- Water Over Temperature Alarm

This alarm is generated if the EWT for DHW is fault or damaged. The 3WV is not able to do the changeover to the secondary or primary loop. A 3WV fault can be related to connection/wiring issue or to component break up and are available only in temporized valve configuration.

Symptom	Cause	Solution
Unit could be ON.All circuits are stopped immediately.Bell icon is moving on controller's display.String in the alarm list:Unitoff waterOverHeatString in the alarm log:± Unitoff waterOverHeatString in the alarm snapshotUnitoff waterOverHeat	Entering water temperature over unit envelope limit.	Check if Unit is working inside allowed envelope
Reset
Local HMINetworkAuto	☑☑☐

5.4 Circuit Events

5.4.1 Cx CompXStartFail – Compressor starting fail event

This event is generated to indicate that the compressor 'x' did not start correctly.

Symptom	Cause	Solution
Compressor status is Off.If the compressor was the first to switch on, the circuit is switched off with the normal shutdown procedure. Otherwise, the circuit will run with the other compressor on.String in the event list:CmpXStartFailString in the event log:± CmpXStartFailString in the snapshotCmpXStartFail	Compressor is blocked.	Check for compressor integrity.
		Check in test mode if the compressor starts manually and create Delta Pressure.
	Compressor is broken.	Check for compressor integrity.
		Check for correct compressor wiring also according with electrical scheme.
Local HMI Network Auto

5.4.2 Cx DischTempUnload – High Discharge Temperature Unload event

This event is generated to indicate that the circuit partially, shutting down a compressor, due to the high value of Discharge temperature detected. This is important for compressor reliability.

Symptom	Cause	Solution
The Circuit reduces its capacity if the DischTmp > DischTmpUnload.If the compressor was the first to switch on, the circuit is switched off with the normal shutdown procedure. Otherwise, the circuit will run with the other compressor on.String in the event list:Cx DischTempUnloadString in the event log:± Cx DischTempUnloadString in the snapshotCx DischTempUnload	The circuit is working outside the compressor envelope.	Check the working conditions, if the unit is working inside the unit envelope, and if the expansion valve is working well.
	One of the compressors is damaged.	Check if the compressors are working properly, in normal conditions and without noises.
Local HMINetworkAuto

5.4.3 Cx EvapPressUnload – Low Evaporator Pressure Unload event

This event is generated to indicate that the circuit partialized, shutting down a compressor, due to the low value of Evaporator pressure detected. This is important for compressor reliability.

Symptom	Cause	Solution
The Circuit reduces its capacity if the EvapPr < EvapPressUnload.If only one compressor is running, the circuit will maintain its capacity. Otherwise, the circuit will shut down one compressor each X sec, till the evaporator pressure increase.String in the event list:Cx EvapPressUnloadString in the event log:± Cx EvapPressUnloadString in the snapshotCx EvapPressUnload	The circuit is working outside the compressor envelope.	Check if the EXV is working well.
		Check the working conditions, if the unit is working inside the unit envelope, and if the expansion valve is working well.
	The outside air temperature is too low (in heat mode).	Check if the unit is working correctly inside the unit envelope.
		The Circuit is near the Defrost request.
	The leaving water temperature is too low (Cool Mode)	Check if the unit is working correctly inside the unit envelope.
Local HMI Network Auto

5.4.4 Cx CondPressUnload – High Condenser Pressure Unload event

This event is generated to indicate that the circuit partially, shutting down a compressor, due to the high value of Condensing pressure detected. This is important for compressor reliability.

Symptom	Cause	Solution
The Circuit reduces its capacity if the CondPr >CondPressUnload.If only one compressor is running,the circuit will maintain its capacity.Otherwise, the circuit will shut downone compressor each X sec, till thecondenser pressure decrease.String in the event list:Cx CondPressUnloadString in the event log:± Cx CondpPressUnloadString in the snapshotCx CondPressUnload	The circuit is working outside thecompressor envelope.	Check for ice on evaporator (Heat mode).
		Check the working conditions, if theunit is working inside the unitenvelope, and if the expansion valveis working well.
	The outside air temperature is high (incool mode).	Check the correct functioning of thefans (in cool mode).
	The leaving water temperature is toohigh (Heat Mode)	Check if the unit is working correctlyinside the unit envelope.
Local HMINetworkAuto

5.4.5 Cx HighPressPd – High Pressure during Pumpdown event

This event is generated during a pumpdown procedure, to indicate that the condensing pressure goes above the unload value.

Symptom	Cause	Solution
The Circuit stops the pumpdown procedure if the CondPr >CondPressUnload.String in the event list:Cx HighPressPdString in the event log:± Cx HighPressPdString in the snapshotCx HighPressPd	The pumpdown procedure was taking too long.	Check if the EXV is working well, and if it is fully close during pumpdown.
		Check the working conditions, if the unit is working inside the unit envelope, and if the expansion valve is working well.
Local HMI Network Auto

5.4.6 DischTmp CompxSenf - Discharge Temperature of compressor sensor fault

This alarm indicates that the discharge temperature sensor, put one for each compressor, is not operating properly. These sensors are placed with the Option "DLT Logic" enabled.

Symptom	Cause	Solution
Compressor is switched Off.The circuit is switched off with the normal shutdown procedure only when all compressors showed the same alarm.Bell icon is moving on controller's display.String in the alarm list:DischTmp CompxSenfString in the alarm log:± DischTmp CompxSenfString in the alarm snapshotCx DischTmp CompxSenf	Sensor is shorted.	Check for sensor integrity.
		Check correct sensors operation according information about kOhm (kΩ) range related to temperature values.
	Sensor is broken.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for correct installation of the sensor on refrigerant circuit pipe.
		Check for absence of water or humidity on sensor electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according with electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.4.7 CxStartFail - Start Fail

This alarm is generated with a low evaporating pressure and a low saturated condensing temperature at the starting of the circuit. This alarm is auto-reset just occurs, as the unit tries automatically to restart the circuit. At the third occurrence of this failure a Restart Fault Alarm is generated.

Symptom	Cause	Solution
Circuit status is Off.The circuit is stopped.Bell icon is moving on controller's display.Led on the button 2 of External HMI is blinkingString in the event list:+Cx StartFailAlmString in the event log:± Cx StartFailAlmString in the event snapshot:Cx StartFail Alm	Low outside ambient temperature	Check the operating condition of the condenser-less unit
	Refrigerant charge low.	Check sight glass on liquid line to see if there is flash gas.
		Measure sub-cooling to see if the refrigerant charge is correct.
	Condensing Setpoint not correct for the application	Check if is necessary to increase the condensing saturated temperature setpoint
	Dry cooler not correctly installed	Check that the dry cooler is safe from strong wind
	Evaporator or condensing sensor pressure broken or not correctly installed	Check the proper operation of the pressure transducers.
Reset
Local HMINetworkAuto	☑☐☑

5.5 Circuit Pumpdown Stop Alarms

All alarms reported in this section produce a circuit stop performed following normal pumpdown procedure.

5.5.1 Cx Off DischTmpSen - Discharge Temperature Sensor fault

This alarm is generated to indicate that the sensor is not reading properly.

Symptom	Cause	Solution
Circuit status is Off.The circuit is switched off with the normal shutdown procedure.Bell icon is moving on controller's display.String in the alarm list:Cx Off DischTmpSenString in the alarm log:± Cx Off DischTmpSenString in the alarm snapshotCx Off DischTmpSen	Sensor is shorted.	Check for sensor integrity.
		Check correct sensors operation according information about kOhm (kΩ) range related to temperature values.
	Sensor is broken.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for correct installation of the sensor on refrigerant circuit pipe.
		Check for absence of water or humidity on sensor electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according with electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.5.2 CxOff OffSuctTempSen - Suction Temperature Sensor fault (Heating Only)

This alarm is generated to indicate that the sensor is not reading properly.

Symptom	Cause	Solution
Circuit status is Off.The circuit is switched off with the normal shutdown procedure.Bell icon is moving on controller's display.String in the alarm list:CxOff OffSuctTempSenString in the alarm log:± CxOff OffSuctTempSenString in the alarm snapshotCxOff OffSuctTempSen	Sensor is shorted.	Check for sensor integrity.
		Check correct sensors operation according information about kOhm (kΩ) range related to temperature values.
	Sensor is broken.	Check if sensor is shorted with a resistance measurement.
	Sensor is not good connected (open).	Check for correct installation of the sensor on refrigerant circuit pipe.
		Check for absence of water or humidity on sensor electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according with electrical scheme.
Reset
Local HMI	☑
Network	☑
Auto	☑

5.5.3 CxOff GasLeakage - Gas Leakage fault

This alarm indicates a gas leakage in the compressor box.

Symptom	Cause	Solution
Circuit status is Off.The circuit is switched off with the shutdown procedure performing a deep pumpdown of the circuit.Bell icon is moving on controller's display.String in the alarm list:CxOff GasLeakageString in the alarm log:± CxOff GasLeakageString in the alarm snapshotCxOff GasLeakage	Gas leakage in the compressors box (A/C units).	Switch off the unit and perform a gas leakage test.
	Gas Leakage in the plant room.	Check if there are leakage on the unit with a detector eventually starting suction fans to change the air in the room.
	Gas leakage sensor fault.	Put the sensor in open air and check that the alarm can be cleared. In case replace the sensor or disable the option before getting a new part.
Reset
Local HMINetworkAuto	☑☑☐

5.6 Circuit Rapid Stop alarms

All alarms reported in this section produce an instantaneous stop of the circuit.

5.6.1 CxOff CondPressSen - Condensing Pressure sensor fault

This alarm indicates that the condensing pressure transducer is not operating properly.

Symptom	Cause	Solution
Circuit status is Off.The circuit is stopped.Bell icon is moving on controller's display.String in the alarm list:CxOff CondPressSenString in the alarm log:± CxCmp1 CondPressSenString in the alarm snapshotCxCmp1 CondPressSen	Sensor is broken.	Check for sensor integrity.Check correct sensors operation according information about mVolt (mV) range related to pressure values in kPa.
	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for correct installation of the sensor on refrigerant circuit pipe. The transducer must be able to sense the pressure through the valve's needle.
		Check for absence of water or humidity on sensor electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.6.2 CxOff EvapPressSen - Evaporating Pressure sensor fault

This alarm indicates that the evaporating pressure transducer is not operating properly.

Symptom	Cause	Solution
Circuit status is Off.The circuit is stopped.Bell icon is moving on controller's display.String in the alarm list:	Sensor is broken.	Check for sensor integrity.Check correct sensors operation according information about mVolt (mV) range related to pressure values in kPa.
CxOff EvapPressSenString in the alarm log:± CxOff EvapPressSenString in the alarm snapshotCxOff EvapPressSen	Sensor is shorted.	Check if sensor is shorted with a resistance measurement.
	Sensor is not properly connected (open).	Check for correct installation of the sensor on refrigerant circuit pipe. The transducer must be able to sense the pressure through the valve's needle.
		Check for absence of water or humidity on sensor electrical contacts.
		Check for correct plug-in of the electrical connectors.
		Check for correct sensors wiring also according electrical scheme.
Reset
Local HMINetworkAuto	☑☑☑

5.6.3 CxOff DischTmpHigh - High Discharge Temperature Alarm

This alarm indicates that the temperature at the discharge port of the compressor exceeded a maximum limit which may cause damages to the mechanical parts of the compressor.

When this alarm occurs compressor's crankcase and discharge pipes may become very hot. Be careful when getting in contact with the compressor and discharge pipes in this condition.

Symptom	Cause	Solution
Discharge Temperature > High Discharge Temperature alarm value. Alarm cannot trigger if discharge temperature sensor fault is active. Bell icon is moving on controller's display. String in the alarm list: CxOff DischTmpHigh String in the alarm log: ± CxOff DischTmpHigh String in the alarm snapshot CxOff DischTmpHigh	The circuit is working outside the compressor envelope.	Check the working conditions, if the unit is working inside the unit envelope, and if the expansion valve is working well.
	One of the compressors is damaged.	Check if the compressors are working properly, in normal conditions and without noises.
		Check for proper operation of the discharge temperature
	Discharge temperature sensor could not operate properly.	Check for proper operation of the discharge temperature
Reset
Local HMI Network Auto

5.6.4 CxOff CondPressHigh - High Condensing Pressure alarm

This alarm is generated in case the Condensing saturated temperature rise above the Maximum condensing saturated temperature and the control is not able to compensate to this condition.

In case of water cooled chillers operating at high condenser water temperature, if the Condensing saturated temperature exceeds the Maximum condenser saturated temperature, the circuit is only switched off without any notification on the screen as this condition is considered acceptable in this range of operation.

Symptom	Cause	Solution
Circuit status is Off.The compressor does not load anymore or even unload, circuit is stopped.Bell icon is moving on controller's display.String in the alarm list:CxOff CondPressHighString in the alarm log:± CxOff CondPressHighString in the alarm snapshotCxOff CondPressHigh	One or more condenser fans do not operate properly (A/C units).	Check if fans protections have been activated.
		Check that the fans can turn freely.
		Check that there is not any obstacle to the free ejection of the air blown.
	Dirty or partially blocked condenser coil (A/C units).	Remove any obstacle.Clean the condenser coil using soft brush and blower.
	Inlet air temperature of the condenser is too high (A/C units).	The air temperature measured at the inlet of the condenser may not exceed the limit indicated in the operational range (working envelope) of the chiller.
		Check the location where the unit is installed and check that there are no any short circuit of the hot-air blown from the fans of the same unit, or even from fans of next chillers (Check IOM for proper installation).
	One or more condenser fan turning in wrong direction (A/C units).	Check for correct phases sequence (L1, L2, L3) in the electrical connection of the fans.
	Excessive charge of refrigerant into the unit.	Check liquid sub-cooling and suction super-heat to control indirectly the correct charge of refrigerant. If necessary recover all the refrigerant to weight the entire charge and to control if the value is in line with kg indication on unit label.
	Condensing pressure transducer could not operate properly.	Check for proper operation of the high pressure sensor.
Reset
Local HMI	☑
Network	☑
Auto	☐

5.6.5 CxOff EvapPressLow - Low Pressure alarm

This alarm is generated in case the evaporating pressure drops below the Low Pressure Unload and the control is not able to compensate to this condition.

Symptom	Cause	Solution
Circuit status is Off.The compressor does not load anymore or even unload, circuit is stopped immediately.Bell icon is moving on controller's display.String in the alarm list:CxOff EvapPressLowString in the alarm log:± CxOff EvapPressLowString in the alarm snapshotCxOff EvapPressLow	Transitory condition like a fan staging (A/C units).	Wait until the condition is recovered by EXV control
	Refrigerant charge is low.	Check sight glass on liquid line to see if there is flash gas.
		Measure sub-cooling to see if the charge is correct.
	Protection limit not set to fit customer application.	Check the evaporator approach and the corresponding water temperature to evaluate the low pressure hold limit.
	High Evaporator Approach.	Clean the evaporator
		Check the quality of the fluid that flows into heat exchanger.
		Check the glycol percentage and type (ethilenic or propilenic)
	Water flow into water heat exchanger is too low.	Increase the water flow.
		Check that evaporator water pump is operating correctly providing the required water flow.
	Evaporating pressure transducer is not working properly.	Check the sensor for proper operation and calibrate the readings with a gauge.
	EEXV is not working correctly.It's not opening enough or it's moving in the opposite direction.	Check if pump-down can be finished for pressure limit reached;
		Check expansion valve movements.
		Check connection to the valve driver on the wiring diagram.
		Measure the resistance of each winding, it has to be different from 0 Ohm.
	Water temperature is low	Increase inlet water temperature.Check the low pressure safeties settings.
Reset
Local HMINetworkAuto	☑☑☑

5.6.6 CxOff RestartFault - Restart Fault

This alarm is generated when the compressor internal protection trips

Symptom	Cause	Solution
Compressor X is OffBell icon is moving on controller's display.String in the alarm list:CxOff RestartFaultString in the alarm log:± CxOff RestartFaultString in the alarm snapshotCxOff RestartFault	This alarm is generated after 165 seconds from circuit start if the evaporating pressure is lower than the Low Pressure Unload Limit. If this alarm is triggered means that the unit is working with too low outside ambient temperature or refrigerant charge is not properly set	Refer to the Low Pressure alarm.
Reset
Local HMINetworkAuto	☐☐☑

5.6.7 CxOff MechHighPress - Mechanical High Pressure Alarm

This alarm is generated when the condenser pressure rises above the mechanical high pressure limit causing this device to open the power supply to all the auxiliary relays. This causes an immediate shutdown of compressor and all the other actuators in this circuit.

Symptom	Cause	Solution
Circuit status is Off.The compressor does not load anymore or even unload, circuit is stopped.Bell icon is moving on controller's display.String in the alarm list:CxOff MechHighPressString in the alarm log:± CxOff MechHighPressString in the alarm snapshotCxOff MechHighPress	One or more condenser fans do not operate properly(A/C units).	Check if fans protections have been activated.
		Check that the fans can turn freely.
		Check that there is not any obstacle to the free ejection of the air blown.
	Dirty or partially blocked condenser coil (A/C units).	Remove any obstacle.Clean the condenser coil using soft brush and blower.
	Inlet air temperature of the condenser is too high (A/C units).	The air temperature measured at the inlet of the condenser may not exceed the limit indicated in the operational range (working envelope) of the chiller (A/C units).
		Check the location where the unit is installed and check that there are no any short circuit of the hot-air blown from the fans of the same unit, or even from fans of next chillers (Check IOM for proper installation).
	One or more condenser fan turning in wrong direction.	Check for correct phases sequence (L1, L2, L3) in the electrical connection of the fans.
	Mechanical high pressure switch is damaged or not calibrated.	Check for proper operation of the high pressure switch.
Reset
Local HMINetworkAuto	☑☐☐

5.6.8 CxOff NoPressChange - No Pressure Change At Start Alarm

This alarm indicates that the compressor is not able to start or to create a certain minimum variation of the evaporating or condensing pressures after start.

Symptom	Cause	Solution
Circuit status is Off.The circuit is stopped.Bell icon is moving on controller's display.String in the alarm list:Cx0ff NoPressChangeString in the alarm log:± Cx0ff NoPressChangeString in the alarm snapshot	Compressor cannot start	Check if the start signal is properly connected to the inverter.
	Compressor is turning in wrong direction.	Check correct phases sequence to the compressor (L1, L2, L3) according to the electrical scheme.
		Inverter is not properly programmed with the right direction of rotation
	Refrigerant circuit is empty of refrigerant.	Check circuit pressure and presence of refrigerant.
CxOff NoPressChange	Not proper operation of evaporating or condensing pressure transducers.	Check proper operation of evaporating or condensing pressure transducers.
Reset
Local HMI	☑
Network	☒
Auto	☐

5.6.9 CompXAlm - Compressor starting fail alarm

This event is generated to indicate that the compressor 'x' did not start correctly. The compressor doesn't generate a correct lift.

Symptom	Cause	Solution
Compressor status is Off.If the compressor switches on, the circuit is switched off with the normal shutdown procedure.Otherwise, the circuit will run with the other compressor on.String in the event list:CmpXA1mString in the event log:± CmpXA1mString in the snapshotCmpXA1m	Compressor is blocked.	Check for compressor integrity.
		Check in test mode if the compressor starts manually and create Delta Pressure.
	Compressor is broken.	Check for compressor integrity.
		Check for correct compressor wiring also according with electrical scheme.
Local HMINetworkAuto	☑☑☐

5.6.10 Cx FailedPumpdown - Failed Pumpdown procedure

This alarm is generated to indicate that the circuit hadn't been able to remove all the refrigerant from the evaporator. It automatically clear as soon as the compressor stops just to be logged in the alarm history. It may not be recognized from BMS because the communication latency can give enough time for the reset. It may not even be seen on the local HMI.

Symptom	Cause	Solution
Circuit status is Off.No indications on the screenString in the alarm list:--String in the alarm log:± Cx FailedPumpdownString in the alarm snapshotCx FailedPumpdown	EEXV is not closing completely,therefore there's “short-circuit”between high pressure side with lowpressure side of the circuit.	Check for proper operation and fullclosing position of EEXV. Sight glassshould not show refrigerant flow afterthe valve is closed.
		Check LED on the top of the valve, CLED should be solid green. If bothLED are blinking alternately the valvemotor is not properly connected.
	Evaporating pressure sensor is notworking properly.	Check for proper operation ofevaporating pressure sensor.
	Compressor on circuit is internallydamaged with a mechanical problemsfor example on internal check-valve,or on internal spirals or vanes.	Check compressors on circuits.
Reset
Local HMINetworkAuto	☐☐☑

5.6.11 CmpX Protection – Compressor Protection

This alarm is generated when the compressor internal protection trips

Symptom	Cause	Solution
Compressor X is OffBell icon is moving on controller's display.String in the alarm list:CmpX ProtectionString in the alarm log:± CmpX ProtectionString in the alarm snapshotCmpX Protection	Compressor motor PTC.Compressor discharge port PTC.	Compressors is damaged
		Compressor is working out of its operating limits.

Reset
Local HMI	☑
Network	☑
Auto	☐

5.6.12 CxOff SSH LowLimit - SSH too low

This alarm is generated when the circuit is running with a SSH too low for a certain amount of time.

Symptom	Cause	Solution
Circuit X is OffBell icon is moving on controller's display.String in the alarm list:SSH LowLimitString in the alarm log:± SSH LowLimitString in the alarm snapshotSSH LowLimit	High Evap PressureFreezing of evaporator	Restart The circuit
Reset
Local HMINetworkAuto	☑☐☑

5.6.13 CxOff Low DSH - DSH too low

This alarm is generated when the circuit is running with a DSH too low for a certain amount of time.

Symptom	Cause	Solution
Circuit X is OffBell icon is moving on controller's display.String in the alarm list:CxOff LowDSHString in the alarm log:± CxOff LowDSHString in the alarm snapshotCxOff LowDSH	EEXV is not working correctly.It's not opening enough or it's moving in the opposite direction.	Check if pump-down can be finished for pressure limit reached;
		Check expansion valve movements.
		Check connection to the valve driver on the wiring diagram.
		Measure the resistance of each winding, it must be different from 0 Ohm.
Reset
Local HMINetworkAuto	☑☑☐

5.6.14 CxOff Drift Suct temp

This alarm is generated when the circuit is running with a DSH too low for a certain amount of time.

Symptom	Cause	Solution
Circuit X is OffBell icon is moving on controller's display.String in the alarm list:CxOff DriftSuctTmpString in the alarm log:± CxOff DriftSuctTmpString in the alarm snapshotCxOff DriftSuctTmp	Wrong suction temperature probe reading.	Check for sensor integrity.
		Check correct sensors operation according information about kOhm (kΩ) range related to temperature values.
		Check for correct installation of the sensor on refrigerant circuit pipe.
Reset
Local HMINetworkAuto	☑☑☐

5.6.15 CxOff LowPrRatio - Low Pressure Ratio Alarm

This alarm indicates that the ratio between evaporating and condensing pressure is below a limit that guarantees the proper lubrication to compressor.

Symptom	Cause	Solution
Circuit status is Off.The circuit is stopped.	Compressor is not able to develop the minimum compression.	Check fan setpoint and settings, it could be too low (A/C units).
Bell icon is moving on controller's display. String in the alarm list: CxCmp1 LowPrRatio String in the alarm log: ± CxCmp1 LowPrRatio String in the alarm snapshot CxCmp1 LowPrRatio		Check compressor absorbed current and discharge superheat. Compressor can be damaged.
		Check the correct operation of suction / delivery pressure sensors.
		Check the internal relief valve didn't opened during previous operation (check the unit history). Note: If the difference between delivery and suction pressure exceed 22bar, the internal relief valve open and need to be replaced.
		Inspect the gate rotors / screw rotor for possible damages.
		Check if the cooling tower or three way valves are operating correctly and properly set.
Reset		Notes
Local HMI Network Auto	☑ ☑

5.6.16 CxEXVDriverFailure - EXV Driver Failure (mono unit)

This alarm is generated when the circuit is running and from the EXV Driver POL94U ad driver fail state is detected.

Symptom	Cause	Solution
Circuit X is OffBell icon is moving on controller's display.String in the alarm list:EXVDriverFailureString in the event log:EXVDriverFailureString in the alarm snapshotEXVDriverFailure	Malfunctioning of the POL94U EXV Driver.	Restart The circuit or Restart the controller.
Reset
Local HMINetworkAuto

5.6.17 CxOff BadFeedbackVlv - Bad Feedback from Valves Alarm (Cooling Only)

This alarm is generated when the closing and opening feedback are both true at the same time, when the Circuit is running or in Pump down state.

Symptom	Cause	Solution
Circuit status is Off.Bell icon is moving on controller's display.String in the alarm list:Cxoff BadFeedbackv1vString in the alarm log:± Cxoff BadFeedbackv1vString in the alarm snapshotCxoff BadFeedbackv1v	The opening and/or closing reading is faulty: the closing and opening feedback are both true at the same time for a certain period, so the real state of the valve is undefined.	Check the correct electrical connection
		Check that the motion of the valve is not locked
		Check the correct limit switch setting
Reset
Local HMINetworkAuto	☑☐☐

5.6.18 Cx BadFeedbackVlvFC – Bad Feedback from Valves in FreeCooling mode Alarm (Cooling Only)

This alarm is generated when the Circuit is running in the FreeCooling mode and the closing feedback of the mechanical valves returns "FALSE", or the opening feedback of the FreeCooling valves returns "FALSE" for a certain period of time. In this case the unit does not stop, the circuit not in alarm will enter Mechanical mode and the alarm will be shown in HMI.

Symptom	Cause	Solution
Circuit FreeCooling status is Off.	The opening and/or closing reading of the valve is faulty in the specific state	Check the correct electrical connection
The Circuit changes its operating mode to MechanicalBell icon is moving on controller's display.String in the alarm list:Cx BadFeedbackv1vFCString in the alarm log:± Cx BadFeedbackv1vFCString in the alarm snapshotCx BadFeedbackv1vFC	of the Circuit: the valves that must be closed are instead in an undefined state, the same for the ones that must be opened.	Check that the motion of the valve is not locked.
		Check the correct limit switch setting
Reset
Local HMINetworkAuto	☑☐☐

5.6.19 CxOff BadFeedbackVlvMech – Bad Feedback from Valves in Mechanical mode Alarm (Cooling Only)

This alarm is generated when the Circuit is running in the Mechanical mode and the closing feedback of the freecooling valves returns "FALSE", or the opening feedback of the mechanical valves returns "FALSE" for a certain period of time.

Symptom	Cause	Solution
Circuit status is Off.Bell icon is moving on controller's display.String in the alarm list:CxOff BadFeedbackV1vMechString in the alarm log:± CxOff BadFeedbackV1vMechString in the alarm snapshotCxOff BadFeedbackV1vMech	The opening and/or closing reading of the valve is faulty in the specific state of the Circuit: the valves that must be closed are instead in an undefined state, the same for the ones that must be opened.	Check the correct electrical connection
		Check that the motion of the valve is not locked
		Check the correct limit switch setting
Reset
Local HMINetworkAuto	☑☐☐

5.6.20 CxOff BadFeedbackVlvMechPd - Bad Feedback from Valves in Mechanical PumpDown mode Alarm (Cooling Only)

This alarm is generated when the Circuit is in the Mechanical PumpDown mode and the closing feedback of the freecooling valves returns "FALSE", or the opening feedback of the mechanical valves returns "TRUE" for a certain period of time.

Symptom	Cause	Solution
Circuit status is Off.Bell icon is moving on controller's display.String in the alarm list:CxOff BadFeedbackV1vMechPdString in the alarm log:± CxOff BadFeedbackV1vMechPdString in the alarm snapshotCxOff BadFeedbackV1vMechPd	The opening and/or closing reading of the valve is faulty in the specific state of the Circuit: the valves that must be closed are instead in an undefined state, the same for the ones that must be opened.	Check the correct electrical connection
		Check that the motion of the valve is not obstructed.
		Check the correct limit switch setting
Reset
Local HMINetworkAuto	☑☐☐

5.6.21 CxOff BadFeedbackVlvFCPd - Bad Feedback from Valves in FreeCooling PumpDown mode Alarm (Cooling Only)

This alarm is generated when the Circuit is in the FreeCooling PumpDown mode and the opening feedback of the freecooling valves returns "TRUE", or the closing feedback of the mechanical valves returns "FALSE" for a certain period of time.

Symptom	Cause	Solution
Circuit status is Off.	The opening and/or closing reading of the valve is faulty in the specific state	Check the correct electrical connection.
Bell icon is moving on controller's display.String in the alarm list:CxOff BadFeedbackV1vFCPdString in the alarm log:± CxOff BadFeedbackV1vFCPdString in the alarm snapshotCxOff BadFeedbackV1vFCPd	of the Circuit: the valves that must be closed are instead in an undefined state, the same for the ones that must be opened.	Check that the motion of the valve is not locked.
		Check the correct limit switch setting.
Reset
Local HMINetworkAuto	☑☐☐

5.6.22 CxOff BadFeedbackVlvOnTransition – Bad Feedback from Valves in Transition state Alarm (Cooling Only) This alarm is generated when the Circuit is in transition between FreeCooling mode and Mechanical mode and the valves take too long time to close or open.

Symptom	Cause	Solution
Circuit status is Off.Bell icon is moving on controller's display.String in the alarm list:CxOffBadFeedbackVlvOnTransitionString in the alarm log:± CxOffBadFeedbackVlvOnTransitionString in the alarm snapshotCxOffBadFeedbackVlvOnTransition	The valves that have to close do not return the closing feedback in a certain time interval, as well as the valves that have to open.	Check the correct electrical connection.
		Check that the motion of the valve is not locked.
		Check the correct limit switch setting.
Reset
Local HMINetworkAuto	☑☐☐

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