Daikin EWYT CZ Series User manual

REV
04
Date
08/2022
Supersedes
D-EOMHP01405_03EN
Air to water heat pump units with scroll compressors
EWYT~CZ / EWAT~CZ
Original Instruction
Operating Manual
D-EOMHP01405-21_04EN

D-EOMHP01405-21_02EN 2/35
Contents
1. SAFETY CONSIDERATIONS..........................................................................................................................................4
1.1. General.................................................................................................................................................................................................4
1.2. Before switching the unit..................................................................................................................................................................4
1.3. Avoid electrocution............................................................................................................................................................................4
2. GENERAL DESCRIPTION ..............................................................................................................................................5
2.1. Basic Information...............................................................................................................................................................................5
2.2. Abbreviations used............................................................................................................................................................................5
2.3. Controller Operating Limits..............................................................................................................................................................5
2.4. Controller Architecture......................................................................................................................................................................5
2.5. Controller maintenance.....................................................................................................................................................................5
2.6. Embedded Web Interface (Optional)................................................................................................................................................6
2.7. Application Save and Reset..............................................................................................................................................................6
3. WORKING WITH THIS UNIT ...........................................................................................................................................7
3.1. Unit Interface.......................................................................................................................................................................................7
3.1.1. Icons Description.........................................................................................................................................................................8
3.2. Insert Password..................................................................................................................................................................................9
3.3. Chiller On/Off.......................................................................................................................................................................................9
3.3.1. Keypad On/Off..............................................................................................................................................................................9
3.3.2. Scheduler....................................................................................................................................................................................10
3.3.3. Network On/Off...........................................................................................................................................................................11
3.3.4. Unit On/Off Switch.....................................................................................................................................................................11
3.4. Silent Mode........................................................................................................................................................................................12
3.5. Water Setpoints.................................................................................................................................................................................12
3.6. Unit Mode...........................................................................................................................................................................................13
3.6.1. Heat/Cool set-up.........................................................................................................................................................................13
3.6.1.1. Cooling-Heating mode by Digital input........................................................................................................................13
3.6.1.2. Cooling-Heating mode by Software parameter...........................................................................................................14
3.7. Pumps and Variable Flow................................................................................................................................................................14
3.7.1. Fixed Speed................................................................................................................................................................................14
3.7.2. Variable Primary Flow (VPF) ....................................................................................................................................................14
3.7.3. DeltaT...........................................................................................................................................................................................14
3.8. Network Control................................................................................................................................................................................15
3.9. Thermostatic Control.......................................................................................................................................................................16
3.10. External Alarm...................................................................................................................................................................................17
3.11. Unit Capacity.....................................................................................................................................................................................17
3.12. Power Conservation.........................................................................................................................................................................17
3.12.1. Demand Limit..............................................................................................................................................................................18
3.12.2. Current Limit...............................................................................................................................................................................18
3.12.3. Setpoint Reset............................................................................................................................................................................18
3.12.3.1. Setpoint Reset by OAT....................................................................................................................................................19
3.12.3.2. Setpoint Reset by 0-10V signal......................................................................................................................................20
3.12.3.3. Setpoint Reset by DT.......................................................................................................................................................20
3.13. Controller IP Setup...........................................................................................................................................................................21
3.14. Daikin On Site....................................................................................................................................................................................21
3.15. Date/Time...........................................................................................................................................................................................22
3.16. Master/Slave......................................................................................................................................................................................22
3.17. Unit Boost..........................................................................................................................................................................................23
3.18. Fan Boost...........................................................................................................................................................................................23
3.19. IO Ext Module....................................................................................................................................................................................23
3.20. Costant Heating Capacity................................................................................................................................................................23
3.21. Domestic Hot Water..........................................................................................................................................................................24
3.22. Customer Unit Configuration..........................................................................................................................................................24
3.23. Connectivity Kit & BMS Connection..............................................................................................................................................25
3.24. About Chiller......................................................................................................................................................................................26
3.25. HMI Screen Saver.............................................................................................................................................................................26
3.26. Generic Controller Operation.........................................................................................................................................................27
3.27. EKDAGBL - Restricted Application Definer .................................................................................................................................27
3.28. HMI Parameters Navigation Table..................................................................................................................................................27
4. ALARMS AND TROUBLE SHOOTING.........................................................................................................................31
4.1. Alarms List: Overview......................................................................................................................................................................31
4.2. Troubleshooting................................................................................................................................................................................33

D-EOMHP01405-21_02EN 3/35
List of graphs
Graph 1 –Compressors start-up sequence - Cool mode ............................................................................................. 16
Graph 2 –Demand Limit[V] vs Capacity Limit[%].......................................................................................................... 18
Graph 3 –Outside Ambient Temperature vs Active Setpoint - Cooling mode(left)/ Heating mode(right)...............19
Graph 4 –External signal 0-10V vs Active Setpoint - Cooling mode(left)/ Heating mode(right) .............................. 20
Graph 5 –Evap ∆T vs Active Setpoint - Cooling mode(left)/ Heating mode(right)..................................................... 20

D-EOMHP01405-21_02EN 4/35
1. SAFETY CONSIDERATIONS
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.
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.

D-EOMHP01405-21_02EN 5/35
2. GENERAL DESCRIPTION
2.1. Basic Information
POL468.85/MCQ/MCQ is a system for controlling single or dual-circuit air cooled chillers. POL468.85/MCQ/MCQ 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 POL468.85/MCQ/MCQ to ensure their safe operation.
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
ESRT
Evaporating Saturated Refrigerant Temperature
CP
Condensing Pressure
EXV
Electronic Expansion Valve
CSRT
Condensing Saturated Refrigerant Temperature
HMI
Human Machine Interface
DSH
Discharge Superheat
MOP
Maximum operating pressure
DT
Discharge Temperature
SSH
Suction Super-Heat
EEWT
Evaporator Entering Water Temperature
ST
Suction Temperature
ELWT
Evaporator LeavingWater Temperature
UC
Unit controller (POL468.85/MCQ/MCQ)
EP
Evaporating Pressure
R/W
Readable/Writable
2.3. Controller Operating Limits
Operation (IEC 721-3-3):
•Temperature -40...+70 °C
•Humidity < 95 % 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 POL468.85/MCQ main controller
•Peripheral Bus is used to connect I/O extensions to the main controller.
2.5. 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, it is important to remove the power supply to all unit.
Refer to picture below for battery installation.

D-EOMHP01405-21_02EN 6/35
2.6. Embedded Web Interface (Optional)
The POL468.85/MCQ/MCQ controller has an embedded web interface, available with accessory EKRSCBMS
(Connectivity for external BMS communication), that can be used to monitor the unit when connected to a TCP-IP network.
It is possible to configure the IP addressing of the POL468.85/MCQ 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.
When connected, it will be required to enter a username and a password. Enter the following credential to get access to
the web interface:
User Name: ADMIN
Password: SBTAdmin!
2.7. Application Save and Reset
Every variations of the HMI parameters will be lost after a power loss and it’s necessary to execute a saving command to
make them permanent. This action can be done via the Application Save command.
The controller automatically makes an Application Save after a change of value of one of following parameters:
Parameters
Name
1.00
Unit Enable
1.01
Circuit 1 Enable
1.02
Circuit 2 Enable
2.00
Available Modes
4.00
Control Source
5.00
Cool Setpoint 1
5.01
Cool Setpoint 2
5.02
Heat Setpoint 1
5.03
Heat Setpoint 2
13.00
DHCP Enable
15.00
Unit Boost
15.01
Fan Boost
15.02
IO Ext Module
15.08
Silent Fan Speed
18.00
Demand Limit Enable
18.01
Current Limit
22.15
Bas Protocol
Some parameters present in the interface require a restart of the UC to become effective after a
change of value. This operation can be done using the Apply Changes command.
These commands can be found in Page [23]:
Menu
Parameter
R/W
23
(PLC)
00 (Application Save)
W
01(Apply Changes)
W
The path in the Web HMI interface for Application Save is “Main Menu”.
The path in the Web HMI interface for Apply Changes is “Main Menu →View/Set Unit →Controller IP Setup →
Settings”.

D-EOMHP01405-21_02EN 7/35
3. WORKING WITH THIS UNIT
3.1. Unit Interface
The user interface installed in the unit is divided into 4 functional groups:
1. Numeric value Display (f.g.1)
2. Actual Parameter/Sub-Parameter group (f.g.2)
3. Icon indicators (f.g.3)
4. Menu/Navigation keys (f.g.4)
The interface has a multi-level structure divided as follows:
Main Menu
Parameters
Sub-Parameters
Page [1]
Parameter [1.00]
Sub-Parameter [1.0.0]
…
Sub-Parameter [1.0.XX]
…
…
Parameter [1.XX]
Sub-Parameter [1.XX.0]
…
Sub-Parameter [1.XX.YY]
Page [2]
Parameter [2.00]
Sub-Parameter [2.0.0]
…
Sub-Parameter [2.0.XX]
…
…
Parameter [2.XX]
Sub-Parameter [2.XX.0]
…
Sub-Parameter [2.XX.YY]
…
…
…
Page [N]
Parameter [N.00]
Sub-Parameter [N.00.0]
…
Sub-Parameter [N.XX.YY]
..
…
Parameter [N.XX]
Sub-Parameter [N.00.0]
…
Sub-Parameter [N..XX.YY]

D-EOMHP01405-21_02EN 8/35
Parameters can be writable, only readable or give access to other sub-parameters (see table in 3.22 chapter).
The list of actions for browsing through the menu is:
1. Press [▲] [▼], in the navigation keys, to browse through the parameter groups, that is shown in (f.g.2) by its
number, and in (f.g.1) by its name.
2. Press [SET] to select a parameter group.
3. Press [▲] [▼] to browse through the parameters in the specific group or menu.
4. Press [SET] to start value setting phase.
a. During this phase, the value string (f.g.1) of the HMI will start to blink
5. Press [▲] [▼] to set/change the parameter value, that is shown in the numeric display (f.g.1).
6. Press [SET] to accept the value.
a. After exiting the setting phase, the value string of the HMI will stop to blink. If an unavailable value is
selected the value will continue to blink and value won’t be set.
In order to go back through the pages, press the On/Stand-by button .
3.1.1. Icons Description
Icons provide an indication about current unit status.
ICON
Description
LED ON
LED OFF
LED BLINKING
LED Functioning mode Chiller
Running incooling mode
-
-
LED Functioning mode Heat Pump
-
Running in heat mode
-
LED Domestic Hot Water
Domestic Hot Water
function ON
Domestic Hot Water
function OFF
-
LED Compressor ON (Circuit 1 Left,
Circuit 2 Right)
Compressor ON
Compressor OFF
Compressor performing
preopen or pump-down
procedure
LED Circulation Pump ON
Pump ON
Pump OFF
-
LED Fan ON
Fan Stage > 0
(At least 1 fan on)
Fan Stage = 0
(All fans off)
-
LED Defrost ON
Defrost Function ON
-
-
°C
LED Temperature
Temperature Value
displayed
-
-
Bar
LED Pressure
Pressure Value displayed
-
-
%
LED Percentage
Percentage Value
displayed
-
-
LED Alarm
-
No Alarm
Alarm Presence
LED Setting mode
Customer parameter
unlocked
-
-
LED Connection status on Daikin on
site
Connected
No Connection
Requesting Connection
LED on/stand-by
Unit Enabled
Unit Disabled
-
LED Boost mode
Boost Mode ON
Boost Mode OFF
-
LED Silent Mode
Silent Mode ON
Silent Mode OFF
-
LED remote BMS control
BMS control ON
BMS control OFF
-

D-EOMHP01405-21_02EN 9/35
3.2. Insert Password
In order to unlock customer functionalities, the User has to insert the Password through the HMI menu [0]:
Menu
Parameter
Range
Description
R/W
00
00
(Insert
Password)
0-9999
To insert all the 4 digits of the password, press “Set” after the insertion of the
number to move on the next digit.
W
The password to access the customer’ setting pages is: 2526
3.3. Chiller On/Off
Unit controller provides several features to manage unit start/stop:
1. Keypad On/Off
2. Scheduler (Time programmed On/Off)
3. Network On/Off (optional with Accessory EKRSCBMS)
4. Unit On/Off Switch
3.3.1. Keypad On/Off
Keypad On/Off allows to enable or disable the unit from local controller. If needed, single refrigerant circuit can be also
enabled or disabled. By default, all refrigerant circuits are enabled.
Menu
Parameter
Range
Description
R/W
01
00
(Unit Enable)
0-2
0 = Unit disabled
W
1 = Unit enabled
W
2 = Unit enabling state based on Scheduler programming. Refer to chapter
3.3.2
W
01
(Circuit 1
Enable)
0-1
0 = Circuit 1 disabled
W
1 = Circuit 1 enabled
W
02
(Circuit 2
enable)
0-1
0 = Circuit 2 disabled
W
1 = Circuit 2 enabled
W
The path in the Web HMI interface is “Main Menu → Unit Enable”.

D-EOMHP01405-21_02EN 10/35
3.3.2. Scheduler
The activation / deactivation of the unit can be managed automatically through the Schedule function, activated when the
Unit Enable parameter is set to Schedule.
The operating modes during the different daily time bands are managed through the interface page [17] containing the
following registers to be set:
Menu
Page
Parameter
R/W
Psw
[17] = Scheduler
(Scheduler)
[17.00] = Monday
(Monday)
[17.0.0] Time 1
W
1
[17.0.1] Value 1
W
1
[17.0.2] Time 2
W
1
[17.0.3] Value 2
W
1
[17.0.4] Time 3
W
1
[17.0.5] Value 3
W
1
[17.0.6] Time 4
W
1
[17.0.7] Value 4
W
1
[17.01] = Tuesday
(Tuesday)
[17.1.0] Time 1
W
1
[17.1.1] Value 1
W
1
[17.1.2] Time 2
W
1
[17.1.3] Value 2
W
1
[17.1.4] Time 3
W
1
[17.1.5] Value 3
W
1
[17.1.6] Time 4
W
1
[17.1.7] Value 4
W
1
[17.02] = Wednesday
(Wednesday)
[17.2.0] Time 1
W
1
[17.2.1] Value 1
W
1
[17.2.2] Time 2
W
1
[17.2.3] Value 2
W
1
[17.2.4] Time 3
W
1
[17.2.5] Value 3
W
1
[17.2.6] Time 4
W
1
[17.2.7] Value 4
W
1
[17.03] = Thursday
(Thursday)
[17.3.0] Time 1
W
1
[17.3.1] Value 1
W
1
[17.3.2] Time 2
W
1
[17.3.3] Value 2
W
1
[17.3.4] Time 3
W
1
[17.3.5] Value 3
W
1
[17.3.6] Time 4
W
1
[17.3.7] Value 4
W
1
[17.04] = Friday
(Friday)
[17.4.0] Time 1
W
1
[17.4.1] Value 1
W
1
[17.4.2] Time 2
W
1
[17.4.3] Value 2
W
1
[17.4.4] Time 3
W
1
[17.4.5] Value 3
W
1
[17.4.6] Time 4
W
1
[17.4.7] Value 4
W
1
[17.05] = Saturday
(Saturday)
[17.5.0] Time 1
W
1
[17.5.1] Value 1
W
1
[17.5.2] Time 2
W
1
[17.5.3] Value 2
W
1
[17.5.4] Time 3
W
1
[17.5.5] Value 3
W
1
[17.5.6] Time 4
W
1
[17.5.7] Value 4
W
1
[17.06] = Sunday
(Sunday)
[17.6.0] Time 1
W
1
[17.6.1] Value 1
W
1
[17.6.2] Time 2
W
1
[17.6.3] Value 2
W
1
[17.6.4] Time 3
W
1
[17.6.5] Value 3
W
1
[17.6.6] Time 4
W
1
[17.6.7] Value 4
W
1

D-EOMHP01405-21_02EN 11/35
The path in the Web HMI interface is “Main Menu →View/Set Unit →Scheduler”.
The user can indicate four time slots for each day of the week and set one of the following modes for each of them:
Parameter
Range
Description
Value
[17.x.x]
0 = Off
Unit disabled
1 = On 1
Unit enabled –Water primary setpoint selected
2 = On 2
Unit enabled –Water secondary setpoint selected
3 = Silent 1
Unit enabled –Water primary setpoint selected –Fan maximum speed decreased to Silent Max
Speed
4 = Silent 2
Unit enabled –Water secondary setpoint selected –Fan maximum speed decreased to Silent Max
Speed
When Fan Silent Mode function is enabled the chiller noise level is reduced decreasing the maximum speed allowed for
fans according to Fan Silent Speed setpoint (see 3.4 Chapter for more details).
The Time slots can be set from in “Hour:Minute”:
Parameter
Range
Description
Time
[17.x.x]
“00:00-24:60”
Time of the day can vary from 00:00 to 23:59.
If Hour = 24 the HMI will display “An:Minute” as string and the Value# related to Time# is set for all
hours of the associated day.
If Minute = 60 the HMI will display “Hour:An” as string and the Value# related to Time# is set for all
minutes of the selected hours of the day.
3.3.3. Network On/Off
Chiller On/Off can be managed also with BACnet or Modbus RTU communication protocol.
To control the unit over the network, follow below instructions:
1. Unit On/Off switch = closed
2. Unit Enable = Enable (refer to 3.3.1)
3. Control Source = 1 (refer to 3.8)
The HMI menu is:
Menu
Parameter
Range
R/W
04
00
(Control Source)
Off = Local
W
On = Network
W
Modbus RTU is available as default protocol on RS485 port. The HMI page [22] is used to change between Modbus and
BACnet protocol and set parameters for both MSTP and TCP-IP communication, as shown in chapter 3.22.
The path in the Web HMI interface for Network Control Source is “Main Menu View/Set →Unit →Network Control”.
3.3.4. Unit On/Off Switch
For unit start up is mandatory to close the electrical contact between terminals: XD-703 →UC-D1 (UNIT ON/OFF
SWITCH).
This short circuit can be realized through:
•External electrical switch
•Cable

D-EOMHP01405-21_02EN 12/35
3.4. Silent Mode
Silent mode can be enabled through scheduler or network control.
If the unit is set in “Silent Mode”the maximum speed of fans is reduced according to “Fan Silent Speed”parameter for
both chiller and heat pump mode.
Menu
Parameter
Range
Description
R/W
Psw
15
(Customer
Configuration)
08
(Silent Fan Speed)
500-900
This parameter sets the fan speed in rpm
during silent mode.
Default value for Fan Silent Speed is 650rpm.
W
1
The path in the Web HMI interface for Fan Silent Speed configuration is “Main Menu →Commission Unit →Options
→Silent Fan Speed”.
Notice that, regardless “Fan Silent Mode”enabling the fan speed will be increased in critical operating conditions like high
condensation, high inverters’ fin temperature, etc to prevent alarms or unit damaging.
3.5. Water Setpoints
Purpose of this unit is to cool or to heat (in case of heat pump version) the water, to the setpoint value defined by the user
and displayed in the main page:
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. Setpoint Reset function
As first step the primary and secondary setpoints need to be defined.
Menu
Parameter
Range
Description
R/W
05
00 (Cool LWT 1)
-15°C … 28°C
Primary cooling setpoint.
W
01 (Cool LWT 2)
-15°C … 28°C
Secondary cooling setpoint.
W
02 (Heat LWT 1)
20°C … 60°C
Primary heating setpoint.
W
03 (Heat LWT 1)
20°C … 60°C
Secondary heating setpoint.
W
The change between primary and secondary setpoint can be performed using the Double setpoint contact, available with
accessory EKRSCBMS, 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 function, refer to the section 3.3.2.
When the scheduler function is enabled, the Double setpoint contact is ignored.

D-EOMHP01405-21_02EN 13/35
Based on the ambient temperature which unit is operating, maximum or minimum leaving water
temperature will be automatically controlled to maintain the unit in the proper envelope.
To modify the active setpoint through network connection, refer to “Network control”section 3.8.
The active setpoint can be further modified using the “Setpoint Reset”function as explained in section 3.12.3.
The path in the Web HMI interface for Water Setpoint configuration is “Main Menu →Setpoint”.
3.6. Unit Mode
The Unit Mode is used to define if the chiller is configured to produce chilled or heated water. This parameter is related to
the unit type and is set in factory or during commissioning operation.
Current mode is reported in the main page.
Menu
Parameter
Range
Description
02
00
(Unit Mode)
0 = Cool
Set if chilled water temperature down to 4°C is required. No glycol is
generallyneeded in the water circuitunless ambient temperature may
reach low values. Incase of required water lower than 4°C and water
circuitwith glycol is required, set mode “Cool with glycol”.
1 = Cool with glycol
Set if chilled water temperature below4°C is required. This operation
requires properglycol/water mixture in the plateheatexchangerwater
circuit.
2 = Cool / Heat
Set in case a dual cool/heat mode is required. This setting implies an
operation with double functioning which is activated through the
physical switch or BMS control.
•COOL: The unit will work in cooling mode with the Cool LWT as
the Active Setpoint.
•HEAT: The unit will work in heat pump mode with the Heat LWT
as the Active Setpoint.
3 = Cool / Heat with
glycol
Same behavior of “Cool / Heat” mode but Chilled water temperature
below 4°C is required or glycol is present in the water circuit.
In order to have a properly configurated unit check following settings:
•If EWAT à [02.00] = 0 or 1 (Cool or Cool w/Glycol)
If EWYT à [02.00] = 2 or 3 (Cool/Heat or Cool/Heat w/Glycol)
3.6.1. Heat/Cool set-up
Heat/Cool operating mode can be set using three different methods:
1. Digital input
2. Software parameter
3. Network control
In the Page [2] is possible to define the required method between Digital Input and Software Parameter.
Menu
Parameter
Description
02
01
(Mode Source)
0 = Cooling-Heating operation is defined following software parameter
1 = Cooling-Heating operation is defined following the status of digital input
To control the operating mode trough the Network Control refer to section 3.8
All settings related to Cooling-Heating operation will produce a real mode change only if Unit Mode parameter (refer to
menu 01) is set to:
▪Heat/Cool
▪Heat/Cool w/Glycol
In all other cases no mode switch will be allowed
Menu
Parameter
Range
Description
02
00
(Unit Mode)
0 = Cool
Only cooling mode is permitted
1 = Cool with glycol
2 = Cool / Heat
Both heating andcooling mode is permitted
3 = Cool / Heat with glycol
The path in the Web HMI interface for Mode Source configuration is “Main Menu →Unit Mode →CH_HP_Source”.
3.6.1.1. Cooling-Heating mode by Digital input
When Digital input is selected as control method for cooling-heating switch, unit mode will be set according following table

D-EOMHP01405-21_02EN 14/35
Digital input reference
Digital input state
Description
Cool/Heat switch
Opened
Cooling mode is selected
Closed
Heating mode is selected
3.6.1.2. Cooling-Heating mode by Software parameter
When Software Parameter is selected, as control method for cooling-heating switch and parameter 2.00 is set equal to 2
or 3, unit mode will be set according following table
Menu
Parameter
Description
02
02
(UCoolHeatSw)
Off = Cool Mode
On = Heat Mode
The path in the Web HMI interface for UCoolHeatSw configuration is “Main Menu →Unit Mode →UCoolHeatSw”.
3.7. Pumps and Variable Flow
The UC can manage one water pump connected to the water plate heat exchanger. The pump control type is configured
in page [15] and can operate in three different ways:
1. Fixed Speed
2. Variable Primary Flow (VPF)
3. DeltaT
Menu
Parameter
Descriptiion
R/W
Psw
15
(Customer Configuration)
03
(Pump Ctrl Type)
0 = On- Off
1 = Fixed Speed
2 = VPF
3 = DeltaT
W
1
The path in the Web HMI interface for Pump Ctrl Type is “Main Menu →Commission Unit →Configuration →Options
→Pump Type”.
3.7.1. Fixed Speed
First control mode, Fixed Speed, allows an automatic pump speed variation, between three different speed.
Settings:
1. Speed 1
2. Speed 2
3. Standby Speed
Unit controller switches the pump frequency on the basis of:
1. Actual unit capacity
2. Double Speed digital input state
If there are no active compressors (Unit Capacity = 0%) pump speed is set to Standby Speed, otherwise Speed 1 orSpeed
2 is selected depending on the Double Speed input state.
3.7.2. Variable Primary Flow (VPF)
The second control mode is the VPF mode where the pump speed is controlled in order to maintain a minimum pressure
drop in a remote location of the plant at a setpoint value determined to ensure the required chilled flow through any
terminals or coils. When the system is enabled, unit controller reads the Load Pressure Drop at further terminal and
provides a 0-10V signal as reference for variable speed drive.
Control signal is generated by a PI algorithm and it is always limited between a minimum and maximum value set bydefault
to 0% and 100% while the Bypass 2 way valve is installed on a pipe near to the pumps in order to ensure a minimum
evaporator water flow.
The VPF control mode is regulated by following settings:
•LoadPD Setpoint
•EvapPD Setpoint
•LoadPD
•EvapPD
•Parameter Ti
3.7.3. DeltaT
The third control mode is the DeltaT mode where the pump speed is modulated through a PID to ensure a constant
difference between Evaporator Entering Water Temperature and Evaporator Leaving Water Temperature.
This mode is regulated by following setting:

D-EOMHP01405-21_02EN 15/35
▪DeltaT
All settings related to pump management are available in the menu [8].
Menu
Parameter
Range
Description
R/W
Psw
08
00
(Recirculation
time)
0-300
Minimum time required within flow switch has to be closed to allow unit
startup.
W
1
01
(Standby Speed)
0-100
Pump speed with Unit Capacity = 0
W
1
02
(Speed)
0-100
Actual feedback pump speed.
R
1
03
(Max Speed)
0-100
Maximum value for pump speed.
W
1
04
(Min Speed)
0-100
Minimum value for pump speed.
W
1
05
(Sp Speed1)
0-100
First targetvalue for pump speed in Fixed Speedcontrol conditions.
W
1
06
(Sp Speed2)
0-100
Second target value for pump speed under Fixed Speed control conditions.
W
1
07
(Setpoint kPa1)
0-45
DeltaP target for the farthest terminal of the system.
W
1
08
(Setpoint kPa2)
0-45
Minimumallowed value for the Evaporator Pressure Drop.
W
1
09
(BypassValveSt)
Off/On
Off = Evaporator Pressure Drop > Minimum Evaporator Pressure Drop
Setpoint + Hysteresis.
On = Evaporator Pressure Drop < Minimum Evaporator Pressure Drop
Setpoint.
R
1
10
(LoadPD)
0-1000
This value displays the actual pressure across the furthest Terminal.
R
1
11
(EvapPD)
0-1000
This value displays the actual pressure drop across the Evaporator.
R
1
12
(Parameter-K)
1-10
This value scales the PI algorithm parameters to obtain a faster response.
W
1
13
(Setpoint DeltaT)
0-10
Evaporator Water Temperature difference setpoint.
W
1
14
(VPF Alarm Code)
0-3
VPF’s alarming related to pressure drop sensors.
R
1
The path in the Web HMI interface for Pump Settings is “Main Menu -> View/Set Unit -> Pumps”.
3.8. Network Control
To allow unit’s control from BMS system the Control Source parameter [4.00] needs to be set in Network. All settings
related to BSM control communication can be visualized in Page [4]:
Menu
Parameter
Range
Description
R/W
04
00
(Control Source)
0-1
0 = Network control disabled
On/Off command from network
W
1 = Network control enabled
01
(Enable)
0-1
0 = Unit is Enable
On/Off command from network visualization
R
1 = Unit is Disabled
02
(Cool LWT)
0..30°C
-
Cooling water temperature setpoint from
network
R
03
(Heat LWT)
30..60°C
-
Heating water temperature setpoint from
network
R
04
(Mode)
0-3
0 = Not Used
1 = Chiller
2 = Heat Pump
3 = Not Used
Operating mode from network
R
05
(Current Limit)
mA
-
Current limitation setpoint from network
R
06
(Capacity Limit)
0..100%
-
Capacity limitation level from network
R
Refer to communication protocol documentation for specific registers addresses and the related read/write access level.
The path in the Web HMI interface is “Main Menu -> View/Set Unit -> Network Control”.

D-EOMHP01405-21_02EN 16/35
3.9. 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 to have a smooth control or a quicker response of
the unit.
The unit controller 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 second compressor when available is started 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 compressorsstop
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.
Graph 1 –Compressors start-up sequence - Cool mode
Thermostatic control settings are accessible from menu [9]:
Menu
Parameter
Range
Description
R/W
Psw
09
00
(Start Up DT)
0-5
Delta temperature respect the active setpoint to start the
unit (startup of firstcompressor)
W
1
01
(Shut Down DT)
0-MIN(5, 60.5-LwtSp)
Delta temperature respect the active setpoint to stop the
unit (shutdown of latest compressor)
W
1
02
(Stage Up DT)
0-5
Delta temperature respect the active setpoint to start
second compressor
W
1
03
(Stage Down DT)
0-MIN(5, 60-LwtSp)
Delta temperature respect the active setpoint second
compressor
W
1
04
(Stage Up Delay)
1÷60 [min]
Minimum time between thecompressor startup
W
1
05
(Stage Down Delay)
0÷30 [min]
Minimum time between thecompressor shutdown
W
1
06
(Evaporator Freeze)
if Unit mode = 1 or 3
-18 ÷ 6 [°C]
if Unit mode = 0 or 2
+2 ÷ 6 [°C]
Defines the minimum water temperature before the unit
alarm for evaporator freezing in triggered
W
2
07
(Low Pressure Unload)
if Unit mode = 1 or 3
150÷800 [kPa]
if Unit mode = 0 or 2
600÷800 [kPa]
Minimum pressure before compressor starts unload
action in order to increase evaporating pressure
W
2

D-EOMHP01405-21_02EN 17/35
The path in the Web HMI interface is “Main Menu → View/Set Unit → Thermostatic Control”.
3.10. 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 causes 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 Page [15] as shown below:
Menu
Parameter
Range
Description
15
05
(Ext Alarm)
0 = No
External Alarm disabled
1 = Event
Event configuration generates an alarm in the controller but
takes the unit running
2 = Rapid Stop
Rapid Stop configuration generates an alarm in the controller
and performs a rapid stop of the unit
3 = Pumpdown
Pumpdown configuration generates an alarm in the controller
and performs a pumpdown procedure to stop the unit
The web HMI path for the External Alarm configuration is: Commissioning →Configuration →Options
3.11. Unit Capacity
Information about the unit's current and individual circuit capacities can be accessed from menu Page [3].
Menu
Parameter
Range
Description
R/W
03
00
(Circuit 1 Capacity)
0-100%
Circuit 1 capacity in percentage
R
01
(Circuit 1 Fan
Stage)
0..2
Number of Circuit 1 fans running
R
02
(Circuit 1 Fan
Speed)
0-100%
Fan Speed of Circuit 1 in percentage
R
03
(Circuit 2 Capacity)
0-100%
Circuit 2 capacity in percentage
R
04
(Circuit 2 Fan
Stage)
0..2
Number of Circuit 2 fans running
R
05
(Circuit 2 Fan
Speed)
0-100%
Fan Speed of Circuit 2 in percentage
R
06
(Total Unit Current)
A
Sum of absorbed currents by the unit
R
In the HMI Web Interface, some of these information are available in the paths:
•Main Menu → View/Set Circuit → Circuit 1 (or Circuit 2) → Data
•Main Menu → View/Set Circuit → Circuit 1 (or Circuit 2) → Fans
•Main Menu → View/Set Circuit → Circuit 1 (or Circuit 2) → Compressors
3.12. Power Conservation
In this chapters will be explained the functions used to reduce the unit power consumption:
1. Demand Limit
2. Current Limit
3. Setpoint Reset

D-EOMHP01405-21_02EN 18/35
3.12.1.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 0-10 V signal with a linear relationship shown in the picture below. A signal of 0 V indicates the maximum
capacity available whereas a signal of 10 V indicates the minimum capacity available.
Graph 2 –Demand Limit[V] 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.
The option can be activated through the HMI Unit Interface in the menu [18] Power Conservation, parameter 00:
Menu
Parameter
Range
Description
R/W
18
00
(Demand Limit
Enable)
0-1
(Off-On)
Off = Demand Limit Disabled
On = Demand Limit Enabled
W
01
(Current Lim Sp)
0-200A
The maximum current limit that the unit can reach.
W
In order to enable this option in the HMI Web Interface, go to Main Menu →Commission Unit →Configuration →
Options and set the Demand Limit parameter to Yes.
All info about this function are reported in the Main Menu →View/Set Unit →Power Conservation →Demand Limit
page in the HMI Web Interface.
3.12.2.Current Limit
Current limit function allows to control unit power consumption taking current drawn below a specific limit.
In order to activate the function Current Limit, the user can set a Current Limit Setpoint lowerthan the Default value, defined
through the HMI or BAS communication.
The current limit uses a deadband centered around the actual limit value, such that unit capacity increase is not allowed
when current is within this deadband. If unit current is above the deadband, capacity is decreased until it is back within the
deadband. The current limit deadband is 5% of the current limit.
The Current Limit setpoint is accessible through the HMI, in the menu [18] Power Conservation, parameter 01 (refer to
previous paragraph).
All info about this function are reported in the Main Menu →View/Set Unit →Power Conservation →Current Limit
page in the HMI Web Interface.
3.12.3.Setpoint Reset
The “Setpoint Reset” function can override the chiller water temperature active setpoint when certain circumstances occur.
The aim of this functionis to reducethe 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 (0-10V)
•Setpoint Reset by Evaporator ΔT (EWT)
In order to set the desired setpoint-reset strategy, go to the parameter group number [20] “Setpoint Reset”, according to
the following table:

D-EOMHP01405-21_02EN 19/35
Menu
Parameter
Range
Description
R/W
20
00
(Reset Type)
0-3
0 = No
W
1 = 0-10V
2 = DT
3 = OAT
The path in the HMI Web interface to set the desired strategy is “Main Menu -> Commission Unit ->
Configuration -> Options”and modify the Setpoint Reset parameter.
Parameter
Range
Description
LWT Reset
No
Setpoint reset not enabled
0-10V
Setpoint reset enabled by an externalsignal between 0 and 10V
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”in the HMI Web
interface.
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.
3.12.3.1. Setpoint Reset by OAT
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, go to theparameter
group number [20] “Setpoint Reset”, according to the following table:
Menu
Parameter
Range
Description
R/W
20
01
(Max Reset)
0..10 [°C]
Max Reset setpoint. It represents the maximum temperature variation that
the selectionof the Setpoint Reset logic can cause on the LWT.
W
03
(Max Reset Cooling)
10..30 [°C]
Max Reset possible for the ELWT Setpoint in Cooling Mode.
W
04
(Start Reset
Cooling)
10..30 [°C]
It represents the “threshold temperature” of the OAT to activate the LWT
setpointreset, incooling mode, i.e. the LWT setpoint is overwritten only if
the OAT reaches/overpasses the SRCooling.
W
05
(Max Reset Heating)
-10..10 [°C]
Max Reset possible for the ELWT Setpoint in Heating Mode.
W
06
(Start Reset
Heating)
-10..10 [°C]
It represents the “threshold temperature” of the OAT to activate the LWT
setpoint reset, in Heating mode, i.e. the LWT setpoint is overwritten only
if the OAT reaches/overpasses the SRHeating.
W
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 Max Reset (MR)
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 3 –Outside Ambient Temperature vs Active Setpoint - Cooling mode(left)/ Heating mode(right)

D-EOMHP01405-21_02EN 20/35
3.12.3.2. Setpoint Reset by 0-10V signal
When the 0-10V is selected as Setpoint Reset option, the LWT active setpoint(AS) is calculated applying a correction
based on an external 0-10V signal: 0 V corresponds to 0°C correction, i.e. AS = LWT setpoint, whereas 10 V corresponds
to a correction of the Max Reset (MR) quantity, i.e. AS = LWT setpoint + MR(-MR) as shown in the following picture:
Graph 4 –External signal 0-10V vs Active Setpoint - Cooling mode(left)/ Heating mode(right)
Several parameters can be configured, and they are accessible from the Setpoint Reset menu, go to the parameter group
number [16] “Setpoint Reset”, according to the following table:
Menu
Parameter
Range
Description
R/W
20
01
(Max Reset)
0..10 [°C]
Max Reset setpoint. It represents the maximum temperature variation that
the selectionof the Setpoint Reset logic can cause on the LWT.
W
3.12.3.3. 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 ΔT between the leaving water temperature(LWT) and the evaporator entering(returning)
water temperature (EWT). When the |ΔT| becomes smaller than the Start Reset ΔT setpoint(SRΔT), 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.
Graph 5 –Evap ∆T vs Active Setpoint - Cooling mode(left)/ Heating mode(right)
Several parameters can be configured, and they are accessible from the Setpoint Reset menu, as shown below:
Menu
Parameter
Range
Description
R/W
20
01
(Max Reset)
0..10 [°C]
Max Reset setpoint. It represents the maximum temperature variation that
the selectionof the Setpoint Reset logic can cause on the LWT.
W
02
(Start Reset DT)
0..10 [°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.
W