Dometic VARC series User manual

VARC Chiller Control
Operations Manual
Dometic Group Marine Division
Rev. 20170511
L-3499 English
P/N 338208
COPYRIGHT© 2011-2017 Dometic Group Marine Division. All Rights Reserved.
No part of this publication may be reproduced, translated, stored in a retrieval system, or transmitted in any form or by any means
electronic, mechanical, photocopying, recording or otherwise without prior written consent by Dometic Corporation. Every
precaution has been taken in the preparation of this manual to insure its accuracy. However, Dometic Corporation assumes no
responsibility for errors and omission. Neither is any liability assumed for damages resulting from the use of this product and
information contained herein.

Table of Contents
INTRODUCTION.................................................... 3
PGD1 and PLDPRO NA VIGA T I ON ............ 2
TOUCHSCREEN NA VIGA T I ON .................. 3
MAIN P AGE .......................................................... 3
Chiller Enable ................................................ 3
Chiller Summary ........................................... 3
Chiller Stage ................................................... 3
T rends .............................................................. 3
A larms .............................................................. 3
Remote Support ............................................ 3
Logo .................................................................. 4
Off Icon ............................................................. 4
Cool Icon ......................................................... 4
Heat Icon ......................................................... 4
Electric Heat Icon ......................................... 4
Setpoint Thermometers ............................. 4
GE NE RAL ........................................................... 5
DIGITAL IN PUTS ............................................. 5
Safety Inputs ........................................................... 5
Chilled Water Flow Switch ................................ 5
Refrigerant High Side Pressure L imit .......... 5
ANALOG INPUTS ............................................ 5
High Limit Temperature Setpoint................................ 5
Freeze Temperature Setpoint..................................... 6
Condenser Freeze Protection..................................... 6
PRESSURE TRANSDUCERS.................................... 6
Suction Pressure................................................ 6
Discharge Pressure............................................ 6
RELAYOUTPUTS ............................................ 6
COMP –Compressor ................................................. 6
CWP –Chilled Water Pump ....................................... 6
SWP –Sea Water Pump............................................ 6
RV –Reversing Valve................................................. 6
EH –Electric Heat ...................................................... 6
Fault............................................................................ 7
SYSTEM OVERVIE W ......................................7
System Power-up ................................................7
Software Revision .........................................7
MODBUS............................................................7
Startup ......................................................................7
Operational Checks ..............................................7
Compressor Startup .............................................7
SET POI N T S ...........................................................8
Cooling................................................................8
Heating ...............................................................8
Compressor Staging T ime ........................8
Run Mode – Cooling ...........................................8
Run Mode – Reverse Cycle H eating ............8
Run Mode – Electric H eating (optional
heater barrel) ..........................................................8
OPERATIONAL M ODES ...............................8
PUMP O PE RA TI O N ...........................................8
Chilled Water Pump ....................................9
Sea Water Pump ............................................9
Cooling Mode .........................................................9
Heating M ode ........................................................9
Status Screen Navigation...................................10
Electrical Specifications.....................................17
Appendix I: Touchscreen Navigation ..18
Appendix II: PGD1 & PRO DISPLAY
NAVIGATION TREE ......................................27
Appendix III Multistage setup .................38
Appendix IV Configuration & Setup..................44
Setting Time and Date ..............................................44
Enabling Electric Heat...............................................45
Select Unit of Temperature.......................................46
HMI Setup.................................................................47
Uploading program ...........................................47
Deleting old program:........................................48
Setting Screen Address, Time & Backlight: ......50
7” touch screen connection...............................56
Activating Maintenance Mode ...........................57
Enabling via PGD1 Display.......................................57
Enabling via Touchscreen.........................................59
Appendix V Alarm Table ............................61
Appendix VI Default Parameters ...........64
Appendix VII I/O Table & Wiring
Diagram .............................................................66
VARC Standard Wiring Diagram ....................67
L-3499
E N GLIS H

1
INTRODUCTION
The Dometic VARC (Variable Chiller) controls is a microcontroller-based unit designed to control multiple chillers. This design
allows the user flexibility in the application and improved controls and protection. The VARC Chiller uses a PID loop control to
manage the capacity of the chiller in single or multistage application. This completely variable capacity chiller uses a VFD to
modulate the speed of the compressor to achieve the desired chilled water setpoint. This allows the compressor to be ran at a
minimum speed of 30Hz to a maximum of 240 Hz.
The VARC48 uses a precision PID (proportional integral derivative) loop control algorithm that modulates the compressor speed
and balances chiller output with required load. This smooth operation eliminates large swings in current on the generator. The
VARC48 also uses the advanced technology of an Electronic Expansion Valve (EEV). This provides more precise control of
superheat across a broad range of conditions with no erratic swings as the valve reacts to temperature and pressure changes (no
“hunting”). Using an advanced algorithm, superior superheat control is maintained over extreme operating conditions.
This application supports the following:
oSelection and sequencing of up to four chillers
oSelection and sequencing of one chilled water pump and one sea water pump
oSelection and sequencing of up to 4 EH heaters
oSequencing of devices for runtime equalization
oAlarms and interlocks
oLoad Shedding
oTroubleshooting help
The three main interfaces supported will be the LCD display, referred to as the PGD1 or PLDPRO display, and the HMI
touchscreen.
Figure 1: PGD1 Button Desc r i ptio n
Figure 2: PLDPRO Button Description
Alarm
Indicator
Program
Mode
Escape to
Exit
Scroll Up
Enter
Scroll Down

2
PGD1 and PLDPRO NA V IGA T I ON
Enter Button
The PGD1 controller screen will automatically boot up to the Main screen. This screen allows you to enable or disable the chiller by
pressing the Enter button. Pressing the Enter button will take you to the area of screen you wish to modify. Press multiple times if
required.
Scroll Up/Down Buttons
This button will be used to modify the value such as temperature setpoint or probe adjustment values. The Scroll Up or Scroll Down
button will also navigate you from page to page of the controller. The flashing cursor must be in the upper left-hand corner for the page
navigation. Pressing enter repeatedly will move it to that location.
Esc Button
The Esc button is used to exit your present screen and take you back one screen. Pressing it multiple times will take you back to the
Main screen.
Prg Button
This button takes you to the system menus. Once at the menus, use the scroll buttons to scroll through the various options. Pressing
enter will select that menu item.
Alarm Button
This button will flash red if there is an active alarm. Pressing this button will take you to the active alarm screen to display the alarm.
Once in the alarm screen, use the up/down buttons to scroll through alarms. The Alarm screen captures a snapshot of the system
parameters at the time of the fault. Press and hold the Alarm button for 3 seconds to clear the active alarm if the fault has been corrected.

3
TOUCHSCREEN NA V IGA T I ON
MAIN P AGE
Figure 3: Main P age
C hiller Enable
Touching this icon will take you to the chiller operational screen, where you can enter setpoints for both heating and cooling and
monitor chilled water temperatures and pump current information.
Chiller Summary
Touching this icon will take you to the summary screen, where you can see the state of your HP, LP and FS and view your stage
supply water temperature out for all available stages. Touching a stage on the screen will take you to that chiller stage for
additional information.
C hiller Stage
Touching this icon will take you to the first stage, where the system refrigerant circuit and chilled water circuit can be monitored.
This screen has multiple hotspots where all stage parameters can be viewed. If the system has the installed option, additional
available hotspot icons will appear to view additional information. Forward and back buttons will navigate to the next stage.
T rends
Touching this icon will take you to the trending screen where you can view graphically how your system has been performing.
The graph data is downloadable to a USB stick. Water temperatures and pressures as well as compressor current are available
for graphing.
A larms
Touching this icon will take you to the active alarm screen where alarms can be reviewed and cleared. Alarm history can also be
viewed from here by using the navigation buttons on the top that take you to the alarm history. Using the drop-down menu will
allow you to go back from minutes to months in the fault history. There is also an information icon that will take you to a help
screen to display the possible causes of your alarm to aid in the troubleshooting of your system
R emote Support
Touching this icon takes you to the screen where you can enable a third party to view your system over an Internet connection
via a VNC (Virtual Network Computing) server.

4
Figure 4: Touch Locations on S creen
L ogo
The touchscreen logo is customizable. Pressing the logo will return you to the Main menu screen from any sub-screens.
Some screens contain pop-up screens with information. To exit a pop-up, simply touch the X to close the screen.
Off Icon
Off icon will be illuminated only if the system is in a run state. Touch the Off icon to turn off the system.
C ool Icon
Cool will be illuminated only if the system is in cooling. Touch this icon to put the system in cool mode and the word cool will
appear on the screen.
H eat Icon
Heat will be illuminated only if the system is in heating. Touch this icon to put the system in heat mode and the word heat will
appear on the screen.
E lectric Heat Icon
Only visible if option is installed. Electric Heat will be illuminated only if the system has electric heat enabled. Touch this
icon to put the system in heat mode and the word heat will appear on the screen.
S etpoint Thermometers
These icons are touched to adjust the cooling or heating set points.
See Appendix 1 for complete touchscreen navigation.

5
GE NE RAL
The VARC chiller is a PLC based control system that uses a PID control loop to manage the capacity requirements of the system.
This control loop allows for finite control to match the capacity of the chiller to the thermal load demand on the system. This system
differs greatly from the on/off control of a standard chiller system, as it will modulate the speed of the compressor to increase or
decrease its capacity allowing for reduced current consumption by the electrical system.
The chiller system will come programmed from the factory with the options enabled for that system. Although the system offers
flexibility, these options can only be enabled by a factory representative.
The user will be able to select between Normal, Econo and Boost mode operation in single stage configuration. In a multistage
configuration the user will also be able to select between Normal or Accelerated startup to bring the system chilled water temperature
down faster or in the case of heat mode temperature higher.
The VARC controller is internally grounded with isolation between inputs and outputs. Additionally, the output relays offer double
isolation so that different voltages can be used for groups of relays.
The system will utilize various sensor types for measuring analog temperatures and pressures. For temperature measurements, the
system will use NTC type 10K@77° thermistors. Pressure transducers are ratiometric 0-650 PSI (45 bar) range for both suction and
discharge monitoring.
DIGITAL IN PUTS
Digital inputs are used to monitor the status of the protection circuits for the system.
Safety Inputs
All discrete inputs will be checked before the system will be enabled. Any faults detected on start-up must be verified and cleared
via the VARC before system will start normal operation.
Chilled Water Flow Switch
With the system in either heating or cooling mode the Flow switch must be closed prior to system starting or a stage being enabled.
In operation if Flow is lost for more than 10 consecutive seconds, the compressor or heat relay will be disabled. A flow switch fault
will be recorded and displayed.
A CW Flow fault will be recorded and system will be in lockout and a manual restart will be required. The VARC will not allow the
compressor or electric heat relay to be energized for the stage that has lost flow or the whole system if a common flow switch is being
used.
Fault must be manually acknowledged via the VARC and cleared prior to re-enabling the system or stage.
Refrigerant High Side Pressure L imit
The VARC will immediately acknowledge an open circuit if the HI pressure switch is tripped and de-energize the compressor. It will
record and display high pressure fault on the alarm screen. If the VARC detects a high pressure fault during operation, a HP fault will be
displayed and recorded. The VARC will not allow the compressor relay to be re-energized, until switch is in the closed position.
The fault must be manually acknowledged via the VARC and cleared prior to re-enabling the system or stage.
ANALOG INPUTS
High Limit Temperature Setpoint
The high limit temperature sensor is continuously monitored whether in Cooling, Reverse Cycle or Electric Heat mode.
This sensor is used to detect a high temperature condition in the supply water from the chiller. If the chilled water temperature is sensed
to be greater or equal to 125°F (51.7°C), all enabled compressor relays will be de-energized, turning off the compressor(s) if operating
in reverse cycle mode. If electric heat is being used, all enabled heater relays will be de-energized, turning off the heating element(s).

6
As the temperature falls, the compressor or electric heat relay will re-energize when the temperature reaches 110°F (43.3°C).
A high temperature fault will be recorded and displayed if the system exceeds the alarm set point. In a high temperature situation,
VARC will not allow the compressor or electric heat relay to be energized. The fault must be manually acknowledged on the active alarm
screen and cleared prior to re-enabling the system or stage.
If a temperature sensor is bad or not connected, the VARC will display an alarm for that sensor.
Freeze Temperature Setpoint
The low limit temperature sensor is continuously monitored whether in Cooling, Reverse Cycle or Electric Heat mode.
This sensor is used to detect a freeze condition in the supply water of the chiller. If the chilled water temperature is sensed to be equal to
or less than 38°F (3.3°C), then the compressor relay will be de-energized, shutting off the compressor. As the temperature rises, the
compressor relay will re-energize when the temperature reaches 42°F (5.6°C).
A low temperature fault will be recorded and displayed if the system falls below the alarm set point. In a low temperature situation,
VARC will not allow the compressor or electric heat relay to be energized. The fault must be manually acknowledged on the active
alarm screen and cleared prior to re-enabling the system or stage.
If a temperature sensor is bad or not connected, the VARC will display an alarm for that sensor.
Condenser Freeze Protection
The system is equipped with a temperature sensor mounted to the condenser coil. This sensor is there to sense the coil temperature. In
heat mode if the coil temperature drops below 40 °F, the VARC controls will automatically lower the speed of the compressor to half the
speed that it was currently running. The display will indicate “Freeze Defrost” while performing this operation.
PRESSURE TR AN SD UCERS
Suction Pressure
The suction pressure is continuously monitored by the VARC. If the suction pressure is below the alarm set point for longer than the
programmed time delay, a fault will occur. This low suction fault will be recorded and displayed on the alarm screen.
The fault must be manually acknowledged via the VARC and cleared prior to re-enabling the system or stage.
Discharge Pressure
The discharge pressure is continuously monitored by the VARC. If the discharge pressure is above the alarm set point for longer than the
programmed time, a fault will occur. This high pressure fault will be recorded and displayed on the alarm screen.
The fault must be manually acknowledged via the VARC and cleared prior to re-enabling the system or stage.
RELAY OUTPUTS
COMP – C ompressor
VARC COMP output will provide switched power to the VFDenablepinfor the compressor normal operation.
CWP – Chilled Water Pump
VARC CWP output will provide switched power to the contactor coils for the chilled water pump.
SWP – Sea Water P ump
VARC SWP output will provide switched power to the contactor coils for the sea water pump.
RV – Reversing Valve
VARC RV output will provide switched power to the coils for the reversing valve.
EH – Electric H eat
VARC EH output will provide switched power to the contactor coils for the electric heat.

7
F ault Provides a Normally Open (NO) contact point. Any fault condition will close the NO contact. This output can be used to power a
light, relay, or interface to a ship’s monitoring system. The output on this terminal will be 230 VAC.
SYSTEM OVERVIE W
System Power-up
S oftware Revision
Upon applying power to the system, the display will indicate the software revision number or display it on the main status screen.
VARC is enabled and waiting for user selection.
MODBUS
The VARC comes with a 3 wire Modbus connection as part of the electrical box. This connection is used for multistage configuration,
touchscreen and networking to a boat management system.
Startup
The VARC Chiller controller can be operated as a single or a multistage chiller plant. During initial setup, the system will be configured for
the number of stages and the available options. System is set for Return water control but can be modified for Supply water control if
needed. The user has the option to select between metric values being displayed or Imperial values being displayed during operation of
the system.
In a multistage configuration the user will be able to change the different operating startup modes. The two startup modes are: normal
stage startup or accelerated mode startup. The normal startup is when the system has a time delay between the staging up of the various
stages. Stage one will be initiated and will start its operation once the PID determines that more capacity is required the second stage will
be initiated. While in operation and the system has maintained the chilled water loop and the PID has determined that that no additional
stage is required or has met capacity demand it will reduce the speed of the compressors. The compressors will operate at minimal
speed to maintain the chilled water loop. If the speed of the compressor still exceeds the demand the stage with the most run hours will
be turned off.
The VARC chiller allows the user to select between three operating modes. Econo mode, normal mode and boost mode. These three
modes allow the user to have predefined current limits. The economy mode is the energy efficient mode where the compressor is limited
to default five amp configuration. The normal mode is the typical mode of operation where the current limit is set to 9 Amps for both heat
and cool modes. The boost mode allows the system to run at maximum capacity without current limitation other than the full limits of the
frequency drives which is 12 amps.
Chilled water setpoint will be entered for Cool and Heat mode.
Once enabled, CW and SW pumps will be turned on for operation.
Operational Checks
Once the VARC is enabled the system will conduct pre-startup checks. The VARC program will check all CW flow switches for faults. The
VARC will also check HP and LP (optional) switches for faults.
Individual stage faults will only disable that stage.
Compressor Startup
The VARC utilizes a BLDC compressor that is capable of operating at a very high frequency. This requires that the compressor have a
ramped startup to establish proper lubrication as to not damage the compressor. This startup has a ramp time and a minimal speed
operation that will last for 100 seconds to allow the compressor to properly warm-up before operating at maximum speed.
The compressor minimum on time is 100 seconds and minimum off time is also 100 seconds with a minimum time between starts of 120
seconds. These default parameters allow the compressor to operate in a safe mode that will not damage the compressor.

8
S ET POI N T S
Cooling
Cooling setpoint is a VARC adjustable parameter from 42°F (5.56°C) (for Supply control and 48°F Return control) to 55°F (13°C) in one
degree increments. To adjust the cooling setpoint, simply touch the VARC screen and change to desired new setpoint. In cooling mode,
you will not be able to enter a number outside of this range.
Heating
Heating setpoint is a VARC adjustable parameter from 100°F (38°C) to 114°F (45.56°C) in one degree increments. To adjust the
heating setpoint, simply touch the VARC screen and change to desired new setpoint. In heating mode you will not be able to enter a
number outside of this range.
C ompressor S taging T ime
Compressor staging time is a VARC adjustable parameter where 2 modes are selectable between normal and accelerated staging.
The accelerated staging is only available in a multistage configuration. The normal staging works the same as the on off system where
there is a time delay between the multiple stages driven by the PID loop. The accelerated staging is only available during initial startup
in a multistage configuration. This accelerated startup is when all available stages are turned on simultaneously. The stages will start
the ramp-up process at the same time after the fixed startup delay. After this delay the units will ramp the maximum speed to achieve
maximum capacity.
Run Mode – C ooling
Compressor rotation is active during run mode. The compressor with the lowest running hours will be enabled first and compressor with
the highest running hours will be disabled first.
First stage will be enabled and the compressor will start after CW and SW flows are stable for 10 seconds (default).
First stage will continue to run for 1 minute before enabling the next stage. If the PID loop requires demand, then the next stage will be
enabled with a startup delay of 3 minutes before running up to required speed.
Run Mode – Reverse Cycle H eating
Compressor rotation is active during run mode. The compressor with the lowest running hours will be enabled first and compressor with
the highest running hours will be disabled first.
Enable Reverse Cycle Heat only for the system.
First stage heating will be enabled and the compressor will start after CW and SW flows are stable for 10 seconds.
First stage will continue to run for 5 minutes before enabling the next heater stage. If the PID loop requires demand, then the next
stage will be enabled with a startup delay of 3 minutes before running up to required speed.
Run Mode – Electric H eating (optional heater barrel)
Heater rotation is active during run mode. The heater with the lowest running hours will be enabled first and the heater with the highest
running hours will be disabled first.
Enable Electric Heat only for the system.
First stage will be enabled and the electric heater will start after CW flow is stable for 10 seconds.
First stage will continue to run for 5 minutes before enabling the next heater stage. If the PID loop requires demand then the next
stage will be enabled.
OPERATIONAL M ODES
PUMP O PE RA TI O N

9
C hilled W ater Pump
The chilled water pump relay shall close if the system is in heat mode or cool mode. The pump will be enabled 5 seconds prior to the
first stage being enabled. Pump will be on for continuous operation when system is enabled
S ea Water Pump
The sea water pump will have a selectable operating mode between continuous operation or cycle with compressor operation. The
default configuration is to cycle with the demand.
The sea water pump relay shall close 5 seconds before the compressor starts in heating or cooling modes and will open 5 seconds
after the last compressor cycle is completed. If immersion heating is available and used, the sea water pump will be disabled.
In a multistage configuration the pump outputs can be daisy chained at the back of the unit to supply power to the pumps. This will
allow any stage to supply power to the pumps when being staged on and off and as a redundant control for the pumps.
Cooling Mode
Cooling mode is entered when Cool is selected on the touchscreen or with the display buttons. The system will automatically start cooling
depending on temperature setpoint. The pumps will operate as described in the pump operation section.
oThe board will energize the compressor relay if return water/supply water temperature is above the cooling setpoint and the
staging delay has elapsed.
oThe compressor will continue to run until the cooling setpoint has been reached or an alarm condition exists. A stage will have a
minimum run time of 100 seconds before it can be turned off and a minimum off time of 120 seconds before it can be re-enabled.
This minimum on time is required to ensure that the system is not cycling on and off and not allowing the compressor to properly
warm-up. This ensures proper oil lubrication of the system
oIf the system calls for a stage to be toggled on/off, the next available stage will be used that meets the staging criteria.
oLoad shedding will occur in multistage operation when approaching chilled water setpoint.
oThe reversing valve is toggled to relieve head pressure at the end of a compressor run cycle.
Heating M ode
Reverse Cycle Heating mode is entered when Heat is selected on the touchscreen or with the display buttons. The system will
automatically start heating depending on the temperature setpoint. The pumps will operate as described in the pump operation section.
oThe reversing valve relay will be energized to change the unit to operate in Reverse Cycle Heating mode.
oThe VARC will energize the compressor relay if return/supply water temperature below the programmed heating setpoint and
the staging delay has elapsed. The compressor will continue to run and the reversing valve will remain energized until the
heating setpoint has been reached or an alarm condition exists. As setpoint is reached, the compressor will reduce its speed to
maintain the water temperature. Once it has reached temperature and a hysteresis of 1 degree the unit will turn off the
compressor. Once it has turned off the compressor the reversing valve will de- energize after a 2-second delay.
oA stage will have a minimum run time of 3 minutes before it can be turned off and a minimum off time of 3 minutes before it
can be re-enabled. If the system calls for a stage to be toggled on/off, the next available stage will be used that meets the
staging criteria.
Electric Heating mode is entered when Electric Heat is selected on the touchscreen or with the display buttons. The system will
automatically start heating depending on the temperature setpoint.
oThe VARC will energize the heater relay if return/supply water temperature is below the programmed setpoint and the staging
delay has elapsed in a multistage configuration.

10
Status Screen Navigation
The main home screen is the status screen where the single stage operation can be reviewed or in a multistage configuration the user can
scroll and see the values of the chilled water and other parameters of the additional stages. The user will simply use the down arrow key to
scroll through the various parameters being displayed on the LCD screen. The LCD screen will also indicate on the main screen the mode
of operation whether it is Econo or Normal mode.
Figure 5:
The main screen will also indicate if there is an alarm present on the system by flashing the word alarm in the lower right-hand corner. The
smaller PLD Pro LCD screen also has an audible tone that you will hear when there is an alarm present on the system as well as display
the word alarm in the lower right-hand corner.
Figure 6:
The alarm logger is used to see the alarm history and displays the compressor speed, the CW return & supply temperature, the discharge
& suction pressure.
Figure 7:
The main screen will indicate the chilled water return temperature the chilled water supply temperature as well as the condenser outlet
temperature which is the freeze control indicator for the condensers in heat mode.
Figure 8:

11
The additional screens following the main screen will contain information per Stage. The first screen includes the CW Supply & Return
temperature, flow switch and high pressure Ok or Alarm.
Figure 9:
The next screen you are able to read compressor speed also contains information to let you know if the system is in a safety count down.
Once this time has elapsed and other time delays have been met the system will start up. At the bottom of the screen the unit will display
the envelope status for the operation of the compressor. The envelope status basically tells you if the unit is functioning within the control
parameters for suction and discharge. If the system has a problem controlling the envelope the message will be displayed at the bottom of
that screen.
Figure 10:
The next screen will contain the suction pressure information the discharge pressure information as well as the superheat and sub-cooling
values being calculated by the system.
Figure 11:
The following screens contain the drive status, to access them press enter:
Figure 12:
Figure 13:

12
The final screen will contain the image of the refrigerant circuit and contain the valve position information.
To change the setpoint of the chilled water. The user must press the program button and scroll to Menu item B. Setpoint. The password
prompt will be displayed and 1234 must be entered to have access to change the value from the default.
Figure 14:
Main Menu Items: Screen Navigation Tree
Press enter to select items to view and up/down the screen will automatically return to the main
status screen.
Menu A: On/Off Unit
oUnit Address: 1 (Default)
oPower By Display: ON (Default)
oStatus: Unit ON
Menu B: Setpoints: Password required (1234)
oHeating Setpoint 110 (Default)
oCooling Setpoint 48 (Default)
Current Limiting:
oMode: Normal (Default) Econo or Boost
oEcono: 4 Amps
oNormal: 9 Amps
Configuration:
oTemperature Units: F (Default) Or C
oPressure Units: PSI (Default) or Bar
Menu C: Clock/Scheduler

13
oDate: Change date here.
oHour: Change time here.
oDay: Displayed
Next Screen:
oDST: Enabled (Default)
oDescription Follows:
Menu D: Input/Output View values or status of analog sensors, digital inputs or relay outputs.
oA: Analog Inputs:
oCW Return
oInput B001: Actual Value
oScroll for additional sensor values with down arrow button then ESC to exit.
oB: Digital Inputs:
oFlow Switch
oDI 3 Status: Actual State (Open or Closed)
oScroll Down for additional active digital inputs. This will change depending on what is enabled in the system
configuration.
oC: Relay Outputs:
oSW Pump
oRelay 1 Status: Actual State (ON or OFF)
oScroll Down for additional active relay outputs. This will change depending on what is enabled in the system
configuration.
oD: Analog Outputs:
oNOT USED
Menu E: Alarm History
Will capture the status of the following parameters at the time of the alarm. The most recent alarm will be shown. Use up arrow to
to view previous alarms.
oAlarm will be displayed followed by:
oComp Speed: Actual value
oCW Return: Actual value
oCW Supply: Actual value
oDischarge Pres: Actual value
oSuct Pres: Actual value
Menu F: Board Switch
This menu allows you to change to view additional boards and make changes to that particular board. This only applies to a
multi-stage configuration when units are networked together.
oUnit Address: 1 (Default)
oSwitch to unit: Desired board address
Menu G: Technician
Some subscreens will require a password. Please contact Dometic for service password.
Submenus:

14
Sub Menu A: Information
oThe service contact information is available on this screen.
oScroll to view additional firmware information.
oThe next screen will contain the flash RAM information.
oThe next screen will contain the power cycle status which indicates how many days the unit has been running in the last
time it was turned off or on.
oThe next screen will contain the Evo firmware information.
oThe next screen will show the power plus firmware information.
Sub Menu B: Commission
oOn this screen the technician will be able to enter the dealer contact information. The default contact information is the
Dometic contact information. Then the user will select to update the information by selecting yes at the prompt.
oThen scroll to the next screen. On the screen the user will be asked to commission the system and must select between
yes or no then press enter. This will save the information and once commissioned cannot be changed.
Sub Menu C: Working Hours
oCompressor
oRun hours: Actual
oNum Starts: Actual
Scroll to next screens to view pump and electric heat hours (optional if installed).
Sub Menu D: BMS Config
Used only for configuration system to work with STIIC network.
oBMS Port 1
oProtocol: Carel
Next screen
oBMS Port 1
oAdddress 1 (Default)
oBaud Rate 2400 (Default)
Sub Menu E: Service Settings
Sub Menu A: Working Hour Set
oCompressor
oService Set Point: 0000h (Default) Can be used to set a service interval for system. Will display
message on screen.
oReset to Zero? NO (Default). Used to reset the run hours
oRun hours: Actual Value. Used to set the run hours if compressor or board has been
replaced.
Scroll to view additional items such as the pumps and electric heat if installed.
Sub Menu B: Probe Adjustment
To be used for calibrating the installed temperature sensors or pressure transducers.

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oCW Return
oInput B001
oOffsett 0.0 (Default)
oValue Actual Value
Scroll to view additional analog sensors for calibration.
Sub Menu C: Control Loops
This menu allows you to set the superheat setpoint and other PID parameters for the valve and drive.
NOTE: Do not make changes to the PID loops.
oSuperheat
oCool Setpoint: 10 F (Default)
oHeat Setpoint: 10 F (Default)
Next screen
oSetpoint SH: 10K (Default)
oLowSH thresh: 2.0K (Default)
oLOP thresh: -50.0 C (Default)
oMOP thresh: 26.0 C (Default)
Next screen
Modulating Setup (PID)
oCompressor
oInput Actual Value
oOutput Actual Value
oSetpoint 8.9 (Default)
oBand: 11.0 (Default)
oIntegration Time: 20 (Default)
Sub Menu D: User Save
This is used to save any user specific settings.
oSave? No (Default) Yes
oRestore? No (Default) Yes
oEnable Auto Save: Yes (Default) No
Next screen
This will clear the Alarm History. This is only to be used once the unit has been commissioned.
oContinue? No (Default) Yes
Sub Menu E: Stage Address
This menu is to be used in a multistage configuration to change the additional unit addresses. This is to be done
so that there are no address conflicts when daisy chaining the additional unit mod bus connections. This must
be done prior to connecting all the units together, via Modbus connections.
opLAN Board Addressing

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oCurrent Address: 1(Default)
oChange Address to: 1(Default)
Next Screen
oUnit Settings
oNum of Stages 1 (Default) Max 4
Sub Menu: F Stage Disable
This menu is to be used when in a multistage configuration. This allows a technician to take a stage off-line so
that repairs can be made and the rest of the system be operational in auto mode. The system must be in an off
state to enable stage control. Disabling a stage via breaker will cause system to go into a “Limp Mode”.
oMaintenance
oStage Control: No (Default) Yes.
If Enabled,
oStage 1: Enabled (Default) Disabled
oStage 2: Enabled (Default) Disabled
oStage 3: Enabled (Default) Disabled
oStage 4: Enabled (Default) Disabled
Sub Menu F: Manual Management
This menu allows the technician to manually operate the relay outputs as well as enable or disable analog sensors.
oSub Menu A: Analog Input
oCW Return
oManual Control B001: Off (Default) On
oManual Position: Value Desired
oValue: Actual Value
Scroll to adjust additional sensors
oSub Menu B: Digital Input
oFlow Switch
oManual DI 3: Off (Default) ON
oManual Position: Actual (Enter Desired Position)
oDI Input Status: Actual Value
Scroll to adjust additional inputs
oSub Menu C: Relay Output
oSW Pump
oManual Relay 1: OFF (Default) No
oManual Position: OFF (Enter Desired)
oRelay Status: Actual Posi in tion
Scroll to adjust additional Outputs
oSub Menu D:Analog Outputs
oNOT USED

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Electrical Specifications
Line Voltage 208 To 240 VAC
Frequency 50 or 60 Hz
Phase 1 ph
Chilled Water Pump Output 12 Amps @ 230 V
Sea Water Pump Output 12 Amps @ 230 V
VFD Input 22 Amps @ 230 VAC
VFD Output 12 Amps @ 230 V
Max Breaker 25 Amps @ 230 VAC
Note: Increase breaker size to include pump current if running pumps directly off system.
Maximum Ambient Operating Temperature 140°F (60°C)
Maximum Rh Conditions 99% Non-Condensing
Installation Requirements:
Follow Standard Chiller Installation manual. In addition a recommended 8 to 10 inches keep out
from the back of the unit in case the VFD must be removed.

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Appendix I: Touchscreen Navigation
M AIN P AGE
Figure 15
C HILLER E NAB L E
Figure 1 6