Dometic Varc User Manual

VARC Chiller Control Operations Manual

Dometic Group Marine Division Rev. 20170511 L-3499 English P/N 338208

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 NAVIGATION ............ 2

TOUCHSCREEN NA

MAIN PAGE

Chiller Enable Chiller Summary Chiller Stage T

rends

A

larms Remote Support Logo Off Icon Cool Icon Heat Icon Electric Heat Icon Setpoint Thermometers

GENERAL

.......................................................... 3

.............................................................. 3

.................................................................. 4

............................................................. 4

......................................................... 4

........................................................... 5

DIGITAL INPUTS

Safety Inputs Chilled Water Flow Switch Refrigerant

........................................................... 5

High Side Pressure Limit

ANALOG INPUTS

High Limit Temperature Setpoint ................................ 5

Freeze Temperature Setpoint ..................................... 6

Condenser Freeze Protection ..................................... 6

PRESSURE TRANSDUCERS .................................... 6

Suction Pressure ................................................ 6

Discharge Pressure ............................................ 6

RELAY OUTPUTS

COMP – Compressor ................................................. 6

CWP – Chilled Water Pump ....................................... 6

SWP – Sea Water Pump ............................................ 6

RV – Reversing Valve ................................................. 6

EH – Electric Heat ...................................................... 6

Fault ............................................................................ 7

VIGATION .................. 3

................................................ 3

........................................... 3

................................................... 3

............................................ 3

......................................... 4

............................. 4

............................................. 5

................................ 5

.......... 5

............................................ 5

............................................ 6

SYSTEM

System Power-up

Startup Operational Compressor Startup SET

Run Mode – Cooling Run Mode – Reverse Cycle Heating Run Mode – Electric Heating heater barrel)

OPERATIONAL MODES

PUMP OPERATION

Cooling Mode Heating Mode

OVERVIEW ...................................... 7

................................................ 7

Software Revision

MODBUS ............................................................ 7

...................................................................... 7

Checks

POINTS ........................................................... 8

Cooling ................................................................ 8

Heating ............................................................... 8

Compressor Staging Time

.......................................................... 8

......................................... 7

.............................................. 7

............................................. 7

........................ 8

........................................... 8

............ 8

(optional

............................... 8

........................................... 8

Chilled Water Sea Water

Pump

.................................... 9

Pump

............................................ 9

......................................................... 9

........................................................ 9

Status Screen Navigation ................................... 10

Electrical Specifications ..................................... 17

Appendix I: Touchscreen Navigation

.. 18

Appendix II: PGD1 & PRO DISPLAY NAVIGATION TREE

Appendix III Multistage setup

...................................... 27

................. 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 Appendix VI Default Parameters

............................ 61

........... 64

Appendix VII I/O Table & Wiring Diagram

VARC Standard Wiring Diagram

............................................................. 66

.................... 67

L-3499 EN

GLIS

H

Alarm Indicator

Program Mode

Escape to Exit

Scroll Up

Enter

Scroll Down

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:

The three main interfaces supported will be the LCD display, referred to as the PGD1 or PLDPRO display, and the HMI touchscreen.

o Selection and sequencing of up to four chillers o Selection and sequencing of one chilled water pump and one sea water pump o Selection and sequencing of up to 4 EH heaters o Sequencing of devices for runtime equalization o Alarms and interlocks o Load Shedding o Troubleshooting help

Figure

1:

PGD1 Button

Descri

ption

Figure 2: PLDPRO Button Description

1

PGD1 and PLDPRO

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.

NAVIGATI

ON

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.

2

TOUCHSCREEN NAVIGATI

MAIN PAGE

Figure 3: Main Page

ON

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.

3

Figure 4: Touch Locations

on Screen

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

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.

Heat Icon

4

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

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 ac knowledged via the VARC and cleared prior to re-enabling the system or stage.

High Side Pressure Limit

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).

5

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 te mperature situation,

VARC will not allo w 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

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

TR

AN

SD

UCERS

COMP – C

VARC COMP output will provide switched power to the VFD enable pin for the compressor normal operation.

CWP – Chilled Water

VARC CWP output will provide switched power to the contactor coils for the chilled water pump.

ompressor

Pump

SWP – Sea Water Pump

RV –

EH –

VARC SWP output will provide switched power to the contactor coils for the sea water pump.

Reversing

VARC RV output will provide switched power to the coils for the reversing valve.

Electric Heat

VARC EH output will provide switched power to the contactor coils for the electric heat.

Valve

6

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

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.

Power-up

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

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.

Checks

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.

7

S

ET

Run Mode – C

Run Mode – Reverse Cycle Heating

Run Mode – Electric Heating

POINTS

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 Staging Time

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.

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.

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.

(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 MODES

PUMP OPE

RATION

8

C

hilled Water

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

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.

Pump

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.

o The board will energize the compressor relay if return water/supply water temperature is above the cooling setpoint and the

staging delay has elapsed.

o The 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

o If the system calls for a stage to be toggled on/off, the next available stage will be used that meets the staging criteria. o Load shedding will occur in multistage operation when approaching chilled water setpoint.

o The reversing valve is toggled to relieve head pressure at the end of a compressor run cycle.

Heating Mode

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.

o The reversing valve relay will be energized to change the unit to operate in Reverse Cycle Heating mode. o The 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.

o A 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.

o The 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.

9

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:

10

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:

11

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

o Unit Address: 1 (Default) o Power By Display: ON (Default) o Status: Unit ON

Menu B: Setpoints: Password required (1234)

o Heating Setpoint 110 (Default) o Cooling Setpoint 48 (Default)

Current Limiting:

o Mode: Normal (Default) Econo or Boost o Econo: 4 Amps o Normal: 9 Amps

Configuration:

o Temperature Units: F (Default) Or C o Pressure Units: PSI (Default) or Bar

Menu C: Clock/Scheduler

12

o Date: Change date here. o Hour: Change time here. o Day: Displayed

Next Screen:

o DST: Enabled (Default) o Description Follows:

Menu D: Input/Output View values or status of analog sensors, digital inputs or relay outputs.

o A: Analog Inputs:

o CW Return o Input B001: Actual Value o Scroll for additional sensor values with down arrow button then ESC to exit.

o B: Digital Inputs:

o Flow Switch o DI 3 Status: Actual State (Open or Closed) o Scroll Down for additional active digital inputs. This will change depending on what is enabled in the system

configuration.

o C: Relay Outputs:

o SW Pump o Relay 1 Status: Actual State (ON or OFF) o Scroll Down for additional active relay outputs. This will change depending on what is enabled in the system

configuration.

o D: Analog Outputs:

o NOT 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.

o Alarm will be displayed followed by: o Comp Speed: Actual value o CW Return: Actual value o CW Supply: Actual value o Discharge Pres: Actual value o Suct 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.

o Unit Address: 1 (Default) o Switch to unit: Desired board address

Menu G: Technician

Some subscreens will require a password. Please contact Dometic for service password.

Submenus:

13

Sub Menu A: Information

o The service contact information is available on this screen. o Scroll to view additional firmware information. o The next screen will contain the flash RAM information. o The 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.

o The next screen will contain the Evo firmware information. o The next screen will show the power plus firmware information.

Sub Menu B: Commission

o On 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.

o Then 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

o Compressor o Run hours: Actual o Num 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.

o BMS Port 1 o Protocol: Carel

Next screen

o BMS Port 1 o Adddress 1 (Default) o Baud Rate 2400 (Default)

Sub Menu E: Service Settings

Sub Menu A: Working Hour Set

o Compressor o Service Set Point: 0000h (Default) Can be used to set a service interval for system. Will display

message on screen.

o Reset to Zero? NO (Default). Used to reset the run hours o Run 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.

14

o CW Return o Input B001 o Offsett 0.0 (Default) o Value 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.

o Superheat o Cool Setpoint: 10 F (Default) o Heat Setpoint: 10 F (Default)

Next screen

o Setpoint SH: 10K (Default) o LowSH thresh: 2.0K (Default) o LOP thresh: -50.0 C (Default) o MOP thresh: 26.0 C (Default)

Next screen

Modulating Setup (PID)

o Compressor o Input Actual Value o Output Actual Value o Setpoint 8.9 (Default) o Band: 11.0 (Default) o Integration Time: 20 (Default)

Sub Menu D: User Save

This is used to save any user specific settings.

o Save? No (Default) Yes o Restore? No (Default) Yes o Enable 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.

o Continue? 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.

o pLAN Board Addressing

15

o Current Address: 1(Default) o Change Address to: 1(Default)

Next Screen

o Unit Settings o Num 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”.

o Maintenance o Stage Control: No (Default) Yes.

If Enabled,

o Stage 1: Enabled (Default) Disabled o Stage 2: Enabled (Default) Disabled o Stage 3: Enabled (Default) Disabled o Stage 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.

o Sub Menu A: Analog Input

o CW Return o Manual Control B001: Off (Default) On o Manual Position: Value Desired o Value: Actual Value

Scroll to adjust additional sensors

o Sub Menu B: Digital Input

o Flow Switch o Manual DI 3: Off (Default) ON o Manual Position: Actual (Enter Desired Position) o DI Input Status: Actual Value

Scroll to adjust additional inputs

o Sub Menu C: Relay Output

o SW Pump o Manual Relay 1: OFF (Default) No o Manual Position: OFF (Enter Desired) o Relay Status: Actual Posi in tion

Scroll to adjust additional Outputs

o Sub Menu D:Analog Outputs

o NOT USED

16

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.

17

Appendix I: Touchscreen Navigation

M

AIN PAGE

Figure

15

C

HILLER ENABLE

Figure 16

18

C

HILLER SET

POINTS

Figure 1

7

19

Figure 1

8

C

HILLER STA

Figure 1

9

GE

20

Figure 20

PLC HMI

With an EEV installed you can monitor the valve position and view your suction pressure and temperature. Superheat setpoint and actual will be displayed.

Screen

21

T

RE

NDS

Figure 21

Figure 22

22

A

CTIVE ALARM

Figure 23

S

A

LARM HISTORY

Figure

24

23

A

LARM HELP

Figure 25

Figure 26

24

R

EMOTE SUPPORT

Figure

27

R

EMOTE ENABLE

Figure 28

25

R

EMOTE CON

Figure 29

FIGURATI

ON

26

Main Status Screen

Mode Off/Cool/Heat/ El Ht* CW Supply Temp #.#°F CW Return temp #.#°F CW Supply temp #.#°F Cond. Outlet temp #.#°F Mode Off/Cool/Heat/El Ht*

Main Mode Active*

Stage # Auto/Disabled

Pumps

CW On/Off

SW On/Off Chiller Status Normal/Econo/Boost Varc #1

CW supply temp #.#°F CW return temp #.#°F Flow status Ok/Alm/Off High pressure status Ok/Alm/Off

Electric Heat* Ok/Alm/Off EH FL* Ok/Alm/Off

Compressor speed #.# Hz Compressor speed #.# rps Compressor Current #.# A Envelope Status # Suction

Temperature #.#°F

Pressure #.# psi

Saturation Temp. #.#°F

Discharge

Temperature #.#°F

Pressure #.# psi

Saturation Temp. #.#°F

Super heat temp #.#°F

Subcooling temp #.#°F Varc #2-4 (repeat as above) Varc #1 information (will show the stage the display is connected to)

Varc # 1 Information

Compressor Capacity Regulator

Required Capacity % Actual Capacity % Actual Speed rps

Drive Status

Motor Current #.# A Motor Voltage # Vrms DC Bus Voltage # V Drive Temperature # °F

Drive Status Stopped Fault Flow Diagram

Super Heat # °F

Compressor # °F

TXV Open # %

Steps # stp

EEV # psi

Std-by temp # °F

Legend

* Asterisk indicates this item is only viewable when activated in the factory settings.

A solid box means that it is a submenu of the menu and needs to be accessed by pressing enter.

A dotted box is a break out of the additional information that is contained below that menu category.

Appendix II: PGD1 & PRO DISPLAY NAVIGATION TREE

Main Status Screen

27

Program

Setpoints Clock/Scheduler Input/Output Alarm History Board Switch Technician Factory

Analog Output

Output #.# Vdc

Setpoints

Clock/Scheduler

DST Enable/Disable

DST Enable

End #

Input/Output Analog Input

SW Inlet Input B003 #

Digital Input

Relay Output

Board Switch

Switch to unit: #

Factory

See page 31

Technician

See page 29

Alarm History

Discharge Pressure

Program

Heating Temperature #.# °F Cooling Temperature #.# °F

Electric Heat*

SP #°F 1-Stage Up #°F 1-Stage Down #°F

Current Limiting

Mode Normal/Boost/Econo Econo 4.0 Amps Normal 10.0 Amps

SW Pump Control By Demand/By Unit On

Startup Mode* Normal/Accel Multistage Ramping all run at 50 rps when a new compressor is turned on* Yes/No

Temperature Units °F/°C Pressure Units psi/bar

Unit address: #

Alarm# Alarm Message Compressor Speed # CW Return # CW Supply #

Date ##/##/## Hour ##:## Day #

Analog Input Digital Input Relay Output Analog Outputs

Transition Time # Start #

CW Return Input B001 # CW Supply Input B002 #

Flow switch DI 3 Open/Close Electric Heat Flow Switch DI 5 Open/Close High pressure switch DI 1 Open/Close Load Shedding Switch DI 4 Open/Close

SW Pump Relay 1 On/Off CW Pump Relay 2 On/Off REV Valve Relay 3 On/Off Alarm Relay 7 On/Off

28

BMS Configuration

BMS Port No. # Protocol ###### (scroll to select) Address # Baud Rate #####

Technician

Information Commission Working Hours BMS Configuration Service Settings Manual Management Pump Control

Information

Service Contact Phone ###-###-#### Commission Date ##:## ##/##/## VARC type # Version & Date #.# ##/##/## BIOS & Date #.# ##/##/## Boot & Date #.# ##/##/## Flash Ram # Kb T memory # ## Cycle/s # ms Power Cycle Status

Last Off Time ##/##/## ##:##:## Last On Time ##/##/## ##:##:## Length Time off Days: # Hrs: ## Min: ##

EVO no.

FW Version #.# Service Version #.#

Power+ no.1

Boot release # FW release # FW checksum # MC release #

Commission

Enter contact info Name #### Telephone No. ###-###-#### Update info? Yes/No Commission date ##:## ##/##/## Commission system? Yes/No

Working Hours

Run Hours Number Starts Compressor # h # Chilled Water Pump # h # Seawater Pump # h #

Service Settings

See page 30

Manual Management

Analog Input Digital Input Relay Output Compressor & EEV

Analog Input

Manual Control Manual Pos. Status Value CW Return B001 On/Off #.# #.# CW Supply B002 On/Off #.# #.# SW Inlet B003 On/Off #.# #.#

Digital Input

Manual Control Manual Pos. Status Value Flow DI 3 On/Off Open/Close Open/Close El. Heat Flow DI 5 On/Off Open/Close Open/Close High pressure DI 1 On/Off Open/Close Open/Close Load shedding DI 4 On/Off Open/Close Open/Close

Relay Output

Manual Control Manual Pos. Status Value SW Pump Relay 1 On/Off On/Off On/Off CW Pump Relay 2 On/Off On/Off On/Off Rev valve Relay 3 On/Off On/Off On/Off Alarm Relay 7 On/Off On/Off On/Off

Compressor & EEV

Enable manual valve position Yes/No

Manual Valve position # steps

Compressor

Mode Auto/Manual

Manual Speed #.# rps Required cap. #.# % Actual cap. #.# % Actual Speed #.# rps

Pump Control

CW Pump Manual Enable On/Off Manual Position On/Off Action Status On/Off

Program/Technician

29

Stage Address

pLAN Board Addressing Current Address # Change Address to # Unit Settings

No. of Stages #

Service Settings

System Setup

Probe Adjustments

Input Offset Value

Working Hour Set

Set Point

Reset to

Run Compressor

# h

Yes/No

# h

Chilled Water Pump

# h

Yes/No

# h

Seawater Pump

# h

Yes/No

# h

Control Loops

Stage Disable

Stage # Auto/Disabled

System Setup

Water Loop Control Supply/Return

EH Flow Switch* Yes/No

Alarm Log Reset

Clear Alarm History Yes/No

Program/Technician/Service Settings

CW Return B001 #.# #.# CW supply B002 #.# #.# SW Inlet B003 #.# #.# Probe adjust S1 offset #.# psig S1 probe #.# psig S2 offset #.# °F S2 probe #.# °F S3 offset #.# psig S3 probe #.# psig S4 offset #.# °F S4 probe #.# °F

Superheat Setpoint

Cool Setpoint #°F Heat Setpoint #°F

Thermoregulator

Setpoint SH #°F LowSH threshold #°F LOP threshold temp #°F MOP threshold temp #°F

Modulating Setup

Compressor

Input #.# Output #.# Setpoint #.# K #

Working Hour Set Probe Adjustments Control Loops Alarm Log Reset Stage Address Stage Disable

Zero?

Stage Control Yes/No

Electric Heat Yes/No

Hours

30

Initialization

Erase user settings and install global default value Yes/No Clear all saved data Factory + User Yes/No Insert New Passwords User #### Technician (PW1) #### Factory (PW2) ####

I/O Configuration

See page 36

Factory

Configuration I/O Configuration Factory Settings Initialization

Factory Settings

See page 32

Configuration

Temperature Units °F/°C Pressure Units psi/bar Force clock enable Yes/No Clock mode 24h/12h Disable Buzzer Yes/No Startup delay # s Enable Unit by

Digital Input On/Off Supervisor On/Off pLAN network On/Off Schedule On/Off

Unit Control

Custom 1 On/Off Custom 2 On/Off Custom 3 On/Off Custom 4 On/Off

Analog Input Filtering

Enable Yes/No Input 1 # s Input 2 # s Input 3 # s Input 4 # s Input 5 # s

Manual Control Reset

Enable Yes/No

Time # m PW/Return Delay ### s Scheduler Holidays No. # Modbus Settings

1st Master

Baudrate #####

Stop bit 1/2

Parity Mode None/Even

/Odd Evo Configurator Devices rotation type Time/LIFO/

FIFO/Custom Equalized Circuits power Equalized/

Packed/

Pac.if incr-eq if

DECR Power+ n 1

EVO Configuration

See page 33

Power + n1

See page 34

Program/Factory

31

Factory Settings

VARC Type None/VARC48/

60/72/96 Compressor Based on VARC type Refrigerant Based on compressor Power type 230 V / 16 A Power set 230 V / 30 A Set Defaults Yes/No Control Temp CCW supply/

CCW return No. of stages # Electric Heat (EH) Yes/No Power Cycle Retain Mode/Off Logo Select appropriate Background Select appropriate Flow Switch Yes/No High Pressure Switch Yes/No Low Pressure Switch Yes/No EH Flow Switch* Yes/No Load Shedding Yes/No SW Temperature Inlet Yes/No SW Pump settings

Control By demand/ By unit on Off Delay # s

CW Pump settings

Flow Prove Delay # s Off Delay # s

Reversing valve

RV delay time # s RV toggle time # s

Electric Heat*

Stage Up delay # s

Stage Down delay # s Compressor Alarm Retry Setup

Alarm Retry Setup

Set Pt.

Off

Band

Retries

Set

Dis

Status

CW High

#.#°C

#.#°F

#/## m

# s

#/## m

CW Freeze

#.#°C

#.#°F

#/## m

# s

#/## m

Delay

Retries

Set

Disable

Status CW

# s

#/## m

# s

#/## m

Electric

Heat

# s

#/## m

# s

#/## m

Cool Set Point #.# bar

Compressor

Program/Factory/Factory Settings

Econo mode SW Yes/No Minimum On # s Minimum Off # s Min Time between Starts # s Load Up Time # s Frost Protection Condenser Setpoint #.#°F Condenser Band #.#°F Compressor Speed #.# rps Control Direct/Reverse/Both P/PID/P+I K #.# Minimum # Maximum # DBd #.# Out #

Temperature Limits

Flow Alarm Delay

High Discharge Pressure

Set point #.# bar Retrys #/## m Set Disable # s Status #/## m

High Pressure Switch

Retrys #/## m Set Disable # s Status #/## m

Low Suction Pressure

32

Configuration

Valve Select Type Main Regulation Select Type Auxiliary Regulation Select Type Probe Configuration

Probe S1

Probe S2

Probe S3

Probe S4

Alarm

Enable/Disable

Type

Select

Minimum

#.# barg

Maximum

#.# barg

Alarm Min.

#.# barg

# °C

#.# barg

# °C

Alarm Max.

#.# barg

# °C

#.# barg

# °C

Alarm Mngt

Use backup S3/valve at fixed pos/valve forced closed/no action

valve at fixed pos/valve forced closed/no action

Use backup S3/valve at fixed pos/valve forced closed/no action

valve at fixed pos/valve forced closed/no action

Regulation

Custom

EVO Configuration

Program/Factory/Configuration/EVO Configuration

Configuration Regulation Custom

Minimum steps # Maximum steps # Closing steps # Nom. Step rate # Hz Fast step rate # Hz Holding current # mA Duty cycle # % Opening synchronicity Yes/No Closing synchronicity Yes/No

Valve opening at start-up # % Valve opened in standby # % Prepositioning delay # s PID Parameters

Prop. Gain # Integral time # Derivative time #

Integral Time

LowSH protection # s LOP protection # s MOP protection # s

Alarm delay

Low SH # s LOP # s MOP # s

Alarm low suction temp

Threshold # °C Timeout # s

33

Regulation

See page 35

Custom

Power + n1

Custom

Configuration

Parameters

Program/Factory/Configuration/Power + n1

Motor Type Select Set Defaults Yes/No Save to Custom Yes/No Data Comm. Timeout # s U.M. speed Hz/rps

Num of Motor Poles # Motor Control Mode PM Motor/AC Motor Vector/AC Motor

Motor base freq. #.# Hz

Configuration Regulation

Motor base vol. # Vrms Motor rated current #.# Arms Motor power factor # Out current maximum #.#% Speed profile

Frequency # (1-3) #.# Hz Acc. # (1-4) #.# Hz/s Delay # ((1-3) # s Delay execution Always/Single Force freq. 2 Enabled/Disabled

Deceleration ramp #.# Hz/s V/F Boost voltage #.#% V/F Freq. adjustment #.#% V/F Volt. Adjustment #.#% Motor Mag. Current #.# A Stator Resistance # mOhm Rotor Resistance # mOhm Stator/Ld inductance #.# mH Leakage factor # Lq Inductance #.# mH Speed Loop Kp #.# % Speed Loop Ki # ms Magnetizing Time # ms Starting Current #.# % #.# A Freq. for Start Current #.# % Crankcase heater Auto/Force Off/Force On Crankcase current #.# % #.# A STO alarm mngt Manual Res/Disable/Auto Reset Phase loss detection Enable Overload at Power-on Reset/Restored Enable Manual R/W Yes/No

Address #

Read Value #

Write Value # Yes/No

(V/F)

34

Regulation

EEV Pre-opening *

Program/Factory/Configuration/Power + n1 /Regulation

Output frequency min #.# Hz Output frequency max #.# Hz Skip frequency set #(1-3) #.# Hz Skip frequency band #(1-3) #.# Hz Switching frequency # kHz Switching frequency derating Disabled/Enabled Speed derating mode # Stop mode Ramp/Coast Reverse Speed Disabled/Enabled Flying Start Disabled/Enabled Relay Configuration Select PTC Alarm Disabled/Enabled PTC Alarm delay # s Compressor Regulator

Start-up pressure differential control

Max pressure diff. admitted #.# bar Equalization mode Equalization valve/EEV Pre-opening

Start-up failure control

Pressure diff. min. variation #.# bar Control period # s Restart delay # s Max Retry # #

Speed Management

Start-up forced speed #.# rps Max speed #.# rps Min speed #.# rps Deceleration rate #.# rps/s Acceleration rate #.# rps/s Switch-off rate #.# rps/s

Envelope Control

Speed reduction rate #.# rps/s Min speed admitted #.# rps Out of env. Alarm timeout # s Low press. diff. alarm timeout # s

Discharge Gas Control High Discharge Temp.

Limit #.# °C Alarm #.# °C

Speed Control due to Discharge Gas

Action Distance #.# °C Action Pause # s Comp. Speed Reduction #.# %

EEV Regulation

Mode Suction

Superheat/Discharge/Temp./Disch. Superheat

Discharge Temp Probe Comp Time #.# s Discharge Super Heat Temperature Setpoint #.# °C #.# °C Offset #.# °C #.# °C Hysterisis #.# °C #.# °C

Envelope Control - Low ratio management

By EEV closing Yes/No By compressor speed Yes/No

Max. Equalization time ## s EEV opening ##.# %

35

Analog Inputs

Enable

CW Return

CW Supply

SW Inlet

On/Off

Channel

B001

B002

B003

Normal/High Res.

Input Type

Select/(On/Off)

On/Off

Direction

Reverse/Direct

Delay Time

# s

Value

Open/Closed

Select type

Minimum

#.#

Maximum

#.#

Offset

#.#

Value

#.#

Out of Range Alarm

Power Delay

# s

Run Delay

# s

Units

Temp/Press/Other

Digital Inputs

Switches

Enable

Channel

Action

Delay

Status

Flow

On/Off

#

Open/Close

# s

Open/Close

EH Flow

On/Off

#

Open/Close

# s

Open/Close

High Pressure

On/Off

#

Open/Close

# s

Open/Close

Low Pressure

On/Off

#

Open/Close

# s

Open/Close

Load Shedding

On/Off

#

Open/Close

# s

Open/Close

Econo Mode

On/Off

#

Open/Close

# s

Open/Close

Relay Output

Enable

Channel

Status

SW Pump

Yes/No

#

On/Off

CW Pump

Yes/No

#

On/Off

Rev Valve

Yes/No

#

On/Off

Alarm

Yes/No

#

On/Off

Analog Output

Channel # (0-6) Enable Yes/No Action Direct/Reverse Minimum #.# Vdc Maximum #.# Vdc

I/O Configuration

Analog Inputs Digital Inputs Relay Outputs Analog Outputs

Program/Factory/IO Configurations

36

Display Address

Display address setting # I/O Board address # Terminal config

Terminal configuration

P: 02 Adr Priv/Shared Trm1 # Pr/Sh Trm2 # Pr/Sh Trm3 # Pr/Sh

Display Address

37

Seawater and chilled water pumps are wired directly to VARC 1 with no need for pump relays.

These are connected to the terminals on the front of chiller 1, remove power cover and connect as per labelled connections.

Each chiller stage requires a connection to the seawater and chilled water pump. Three core electrical cable needs to link chiller 1 to chiller 2, chiller 2 to chiller 3 etc for both the seawater and CW connections

Network connections also need to be wired from the Network connection ports. Chiller 1 to Chiller 2, Chiller 2 to Chiller 3 etc

Please refer to the basic wiring diagram on the next page for clarification

Electrical Connections

Appendix III Multistage setup

The VARC can be supplied as a standalone chiller or it can be supplied as part of a staged system.

The factory default setting is set as a standalone chiller.

When supplied as part of a modular system the following connections need to be configured.

o CW & SW connections between each stage. o Network connections between each stage. Physical and network addressing. o Ensuring Firmware is identical between each stage. o Remote control panel configuration.

This document aims to cover all of the above and to run through setting the time, date and unit of measurement as well as the Boat builder logo (touch screen control only)

Chillers supplied on a frame package will be configured and wired as part of the build process.

Please also note that as part of a correctly configured multistage system there is no need to set differential/hysteresis settings.

Initial Wiring

38

Basic wiring diagram

39

Press Prg button to the left

Scroll up or down to Technician, if prompted for a password, 3156

Select Information

Scroll down for Version

Repeat for each stage and ensure VER.: is the same for each stage

Main

Repeat for each stage.

In the unlikely event there is a difference between stages, PCB firmware will require re-flashing by a Dometic approved engineer

Ensuring the Firmware of each chiller is compatible

Chillers should come with the correct firmware preloaded. However, it is worth checking the versions match as incompatible firmware can seem to work during initial setup then but cause networking problems later down the line.

40

When setting up the stages for networking, you need to ensure the chillers are not connected, via Modbus connections. Stage one requires minimal changes so start with stage 2 leaving stage 1 till last. Power off all stages except stage 2. Go into

Go to Technician

Scroll down

Enter Technician Password 3156

Go to stage address

Hit enter, change address to 2 for chiller 2. 3 for chiller 3 etc. Exit screen back to main menu and you will see confirmation of

change in the top right hand corner of the main screen. “U:02” or

“U:03”

Complete the next step of networking before moving on to the next chiller stage.

Please note when configuring the stages, they must not be able to communicate with each other.

Networking (1 of 3)

41

Chiller stage 2 needs to have a display address of 17, chiller stage 3 will be 18 and 4 will be 19. I/O Board address should reflect the change you have just made

Press and hold Up, Down and Enter simultaneously until screen changes, about 6 seconds

At this point screen may go blank, if it does, start from step 1 again (above) and ensure display address and I/O board address is correct for stage. Press enter to go into the terminal config settings

Trm1 = 17 for stage 2, 18 if stage 3 etc… and Pr ID 32 & Sh - this will allow for PGD1 control if used. ID 31 & Pr – this will allow for touchscreen if used. Only enable controls that are being utilized in the

working system.

Press enter until you get to OK? Change to Yes to save settings.

Power down stage and repeat process for all stages, once all complete. Turn on stage 1 and repeat this page (only) ensuring Trm1 = 16 Pr

Step 1

Networking (2 of 3)

42

Turn on all stages and individually make the following changes to

Press enter until the cursor is on “Num of stages” change from 1 to the correct number of stages for current system. Repeat for all stages.

Go to Technician

Scroll down

Enter Technician Password 3156

Go to stage address

Networking (3 of 3)

43

Press Prg button

Scroll to Clock/Scheduler and press

Press enter, notice the cursor flashes on the date field mm/dd/yyyy.

Use the up and/or down keys to select the correct month. Hit enter the press up and/or down to select the correct day.

Press enter to select the year and/or up down buttons to select the correct year.

Press enter again and the cursor drops down to the “Hour”

Use the up and down keys to select the correct hour, then

Cursor goes back to the “Clock” title. Settings have been saved

and you can exit to main screen. Daylight Saving is enabled by default. Scroll down from the clock screen if you wish to disable.

Appendix IV Configuration & Setup

Setting Time and Date

44

Press Prg button

Enter service password 3156

Scroll down to Electric Heat, enter to select, up or down to toggle setting.

Enter to save

Enabling Electric Heat

45

Press Prg button

Go to Setpoints

Scroll down to Temperature Units screen. Hit enter to select. Up or down button to toggle between options.

Once changed, hit enter to return the cursor to the top of the screen.

You will need to make this change to all stages for it to correctly reflect temp readings on remote display

Select Unit of Temperature

46

HMI Setup

Uploading program

To setup the correct program onto the touchscreen follow the steps.

1. Locate USB port located on the back side of the screen.

2. Insert USB memory

3. On the touch screen hold your finger on the screen until a pop window is displayed.

4. Select update

5. Another pop-up will appear and check the box that says Auto select best match and press next

6. Once the screen is updated there will be a reboot. Once completed the screen will display the main screen. Remove USB.

47

Deleting old program:

1. Project manager

a. On the touch screen hold your finger on the screen until a pop window is displayed. b. Select Project Manager

2. Select the project you wish to delete.

48

3. Click delete project, then click yes to confirm.

4. The screen will display the following as it in progress of deleting:

49

5. Once the project is deleted, the project manager screen will not display the project any longer. Click X to exit out of the project manager window.

Setting Screen Address, Time & Backlight:

1. Find a spot on the Touchscreen that is not a hot spot. Touch the screen until you get a pop-up. See below.

50

2. Select: Show system settings.

3. Use the Next or Back button to spin the wheel until you find “Set Device Address”.

51

4. Press the “Set Device Address” button and you will get another screen.

5. Touch the arrow button to select Com1 and change the 31 to 30.

6. Then press ok to save changes, and click X to close the Device Address window.

52

7. Use Next or Back to scroll to Display Settings.

8. Select Display Settings

53

9. Click on the checkmark to automatically turn off backlight while on battery power and external power, so they are not enabled as shown below.

10. Press OK, then click X.

11. Now press Next to scroll to Time.

54

12. The Date/Time Properties window will pop-up. Look at the time zone, and select Eastern Time.

13. The Current Time should show the correct time, press OK then X to close window.

55

When connecting the 7” touchscreen remote screen. Ensure you have a 24 Vdc supply to power the display and that the 3 core communication cable is correctly plugged into Serial port 1 not port 2.

3 core communication cable terminates on to Terminal Bus 3 (Modbus Com) on chiller 1

7” touch screen connection

56

Activating Maintenance Mode

Maintenance mode is a tool in the PLC software that allows the user to disable any of the stages in the system. This allows for ease of troubleshooting and maintenance on one unit, while maintaining full functionality for the other stages. Find below the instructions to access maintenance mode.

Enabling via PGD1 Display

1. Ensure unit mode is set to OFF. In the main screen, press enter and scroll up/down to select OFF, then press enter to save.

2. To access the maintenance mode menu, press Prg and scroll to technician, press enter.

3. In Technician menu scroll to service settings and press enter.

57

4. Enter the service password to continue: 3156.

5. Scroll to Stage Disable, press enter.

6. For Stage Control change No to Yes, press enter, scroll up and press enter.

7. The different stages will display on the screen press enter to access each stage and scroll up/down to change from Auto to Disabled.

58

Enabling via Touchscreen

1. Tap the touchscreen to view the menu buttons, and select Chiller Summary.

2. On Chiller Summary screen click on the wrench to access the maintenance mode pop-up.

59

3. For Chiller Control select Yes from the drop down menu, this will enable Maintenance Mode.

4. To disable a stage click on the drop down menu to the right of the stage number and select disabled. Once complete press X to exit and turn on the unit.

60

Alarm description

Reset

Delay

Alarm relay

System Action

Corrective Action

Chilled Water Supply Sensor Failure

Manual

Immediate

Yes

Shuts off Unit

Check sensor for shorts and opens and compare temperature reading with digital thermometer

Chilled Water Return Sensor Failure

Manual

Immediate

Yes

Shuts off Unit

Check sensor for shorts and opens and compare temperature reading with digital thermometer

Sea Water Inlet Sensor Failure

Manual

Immediate

Yes

Warning Signal

Check sensor for shorts and opens and compare temperature reading with digital thermometer

Chilled Water Supply High

Manual

10 sec

Yes

Turns off compressor or heat relay

Check for low water flow due to restrictions or pump wear

Chilled Water Supply Low

Manual

10 sec

Yes

Turns off compressor or heat relay

Check for low water flow due to restrictions or pump wear

Sea Water Inlet Low

Manual

10 sec

Yes

Warning Signal

Low temperature due to geographical climate

Chilled Water Flow

After 3 retries every 30 mins, must be reset Manually

Immediate

Yes

Turns off compressor or heat relay

Check for proper loop water flow and make sure strainers are not clogged. Check for defective flow switch Bleed air out of the loop water Check loop water pump

High Discharge Pressure

After 3 retries every 30 mins, must be reset Manually

Immediate

Yes

Shut off Unit

Check for proper refrigerant pressure with gauge, if normal then check for defective pressure switch. Assure proper sea water and loop water flow and make sure water strainers are not clogged. Ensure system is not overcharged.

Low Suction Pressure

After 3 retries every 30 mins, must be reset Manually

60 sec

Yes

Shut off Unit

Check for proper refrigerant pressure with gauge, if normal then check for defective pressure switch. Assure proper sea water and loop water flow and make sure water strainers are not clogged. Ensure system is not undercharged.

Low Pressure Differential

Check EEV motor

Compressor Start Failure

After 5 times in 60 mins must be reset Manually

10 sec

Warning Signal

Check voltage to compressor. Check Power inverter.

Condenser Out Temperature Sensor Failure

Manual

Immediate

Warning Signal

Check sensor for shorts and opens and compare temperature reading with digital thermometer

High Discharge Gas Temperature

Automatic

30 sec

Warning Signal

Check for proper refrigerant pressure with gauge

EVD Evo Probes fault or disconnected (S1,S2,S3,S4)

Automatic

Immediate

Yes

Off compressor

Check condition of the wiring and connections

Appendix V Alarm Table

61

Alarm description

Reset

Delay

Alarm relay

System Action

Corrective Action

EVD EVO Low Superheat

Automatic

Immediate

Yes

Warning Signal

Check for proper refrigerant charge as the system may be overcharged. Check water for low flow. Check EEV movement and functionality.

EVD Evo Low Evaporation Temperature (LOP)

Automatic

Immediate

Yes

Warning Signal

Check water flows. Check refrigerant charge.

EVD Evo High Evaporation Temperature (MOP)

Automatic

Immediate

Yes

Warning Signal

Check refrigerant charge.

EVD Evo Low Suction Temperature

Automatic

Immediate

Yes

Warning Signal

Check refrigerant charge.

VARC # in Limp Mode

Automatic

Immediate

No

Warning Signal

Check that the PLC is setup for the correct # of stages, correct and cycle power to the system.

Frost Active

Manual

Immediate

Yes

Off compressor

Low temperature temp switch tripped. Check water flows. Check refrigerant charge.

Electric Heat Run Hours Exceeded

Yes

Off Heater

Check heater voltage

Envelope Alarm

Manual

60 sec

Yes

Off compressor

Clock Board Fault or Not connected

Automatic

Immediate

Yes

Warning Signal

Inverter model not compatible

After 15 retries every 60 mins, must be reset Manually

Make sure Power+ is being used

Power+ in Retry

Warning Signal

Check the power supply

Power+ Device Offline

Automatic

30 sec

Yes

Off compressor

Power+ Fault

Alarms Power+ n˚1

Manual

Immediate

Yes

Turns off

compressor

Check the load Check network control devices and cables Check the input voltage and rectify the trouble. Using a 1000 V megger, check the motor and motor cables for ground faults. Check the input and output circuits for phase loss detection and rectify. Check the condition of the motor and load wiring.

None

1:Overcurrent

2:Motor Overload

3:Overvoltage

4:Undervoltage

5:Over Temp

6:Under Temp

7:Overcurrent HW

8:Motor Overtemp

9:Drive Failure

10:CPU Error

11:Param Default

12:DC bus ripple

13:Data Comms Fault

14:Drive thermistor

15:Autotune fault

Alarm description

Reset

Delay

Alarm relay

System Action

Corrective Action

62

Alarms Power+ n˚1

Manual

Immediate

Yes

Turns off compressor

Check the load Check network control devices and cables Check the input voltage and rectify the trouble. Using a 1000 V megger, check the motor and motor cables for ground faults. Check the input and output circuits for phase loss detection and rectify. Check the condition of the motor and load wiring.

16:Drive disabled

17:Motor Phase

18:Fan Fault

19:Speed Fault

20:PFC Failure

21:Overvoltage

22:Undervoltage

23:STO Detection

24:Reserved

25:Ground Fault

26:CPU Sync 1

27:CPU Sync 2

28:Drive overload

29:Reserved

…

99:Unexpected inverter stop

63

Appendix VI Default Parameters

Parameter

VARC 48

VARC 60

VARC 72

Data Type

Cooling Setpoint CCW Return

48

Deg F

Cooling Setpoint CCW Supply

42

Deg F

Heating Setpoint

110

Deg F

Panasonic Compressor

5KD184XAB21

5JD420XAA22

Inverter part number

PSD1* 12 amp

PSD1* 12

amp

PSD1* 16

Amp

Current Limit Setpoint According to Drive limit

12 Amps

16 Amps

Econo Mode

4 6 6

Amps

Normal Mode

10

12

Amps

Superheat Setpoint

Cool and Heat

10

Deg F

Factory Settings

Control Temp mode

CCW Return

Number of Stages

1 1 1

Electric Heat

No

Pwr Cycle

Retain Mode

Electric Heat

No

Logo

Dometic BLK

Background

Ocean

Flow Switch

Yes

High Pressure Switch

Yes

\ow Pressure Switch

No

Load Shedding

Yes

Condenser Monitoring

Yes

Load Shedding

Yes

SW Pump Settings

Control

By Demand

Off Delay 5 5

5

Seconds

CW Pump Settings

Control

Continuous

Flow Prove Delay

10

Seconds

Off Delay 5 5

5

Seconds

Reversing Valve

RV Delay Time before Toggle Cool Mode

90

Seconds

RV Toggle Time

2 2 2

Seconds

RV Toggle Time

2 2 2

Seconds

Compressor

Min On Time

60

Seconds

Min Off Time

180

Seconds

Compressor

Min Time between Starts

180

Seconds

Load Up Time

10

Parameter

VARC 48

VARC 60

VARC 72

Data Type

Compressor Frost Protection

64

Cond Setpoint

36

Deg F

Cond Band

2.7

Deg F

Comp Speed

60

40

RPS

Compressor PID

Cntrl P P P

K

20

Int 0 0

0

Seconds

Alarm Setups

CW High Temp Limit

Setpoint

125

Deg F

Off Band (SP-)

15

Deg F

Retries 3 3 3

Retry delay

30

Minutes

CW Freeze Limit

Setpoint

38

Deg F

Off Band (SP+)

5.4

Deg F

Retries 3 3 3

Retry delay

10

Minutes

CW Flow

10

Seconds

Retries 3 3 3

Retry delay

10

Minutes

High Discharge Pressure

550

PSI

Retries 3 3 3

Retry delay

30

Minutes

High Pressure Switch

Retry 3 3 3

Retry delay

30

Minutes

Low Suction Alarm

Low Suction Pressure Cool

60

PSI

Low Suction Pressure Heat

60

PSI

Delay

180

Seconds

Retries 3 3 3

Retry delay

30

Minutes

Inverter Alarms

Retry

15

Retry delay

60

Minutes

Disable

300

Seconds

Configuration Menu

Temperature Units

Deg F

Pressure Units

PSI

65

I/O #

Board I/O

Description

Analog Inputs

AI-1

B1

Chilled Water Return

AI-2

B2

Chilled Water Supply

AI-3

B3

Condenser Outlet Refrigerant Temp

AI-4

B4

Suction Temperature

AI-5

B5

Discharge Temperature

AI-6

B6

Suction Pressure

AI-7

B7

Discharge Pressure

Digital Inputs

DI-1

DI1

High Pressure Switch (Optional)

DI-2

DI2

Low Pressure Switch (Optional)

DI-3

DI3

Flow Switch

DI-4

DI4

Load Shedding Input

DI-5

DI5

Electric Heat Flow Switch

DI-6

DI6

Econo Mode Selection

DI-7

DI7

N/A

Analog Outputs

AO-1

Y1

N/A

AO-2

Y2

N/A

AO-3

Y3

N/A

Digital Outputs

DO-1

NO1

Seawater Pump

DO-2

NO2

Chilled Water Pump

DO-3

NO3

Reversing Valve

DO-4

NO4

Electric Heat

DO-5

NO5

N/A

DO-6

NO6

N/A

DO-7

NO7/NC7

Alarm

Appendix VII I/O Table & Wiring Diagram

66

VARC Standard Wiring Diagram

Figure

67

NOTES

68

NOTES

69

DOMETIC MARINE DIVISION

2000 N. Andrews Ave. Pompano Beach, FL 33069 USA Tel +1 954-973-2477 Fax +1 954-979-4414 Email marinesales@dometicusa.com

24/7 TECH SUPPORT FOR UNITED STATES AND CANADA 8:00 AM to 5:00 PM Eastern Time: 800-542-2477 After hours and weekends: 888-440-4494

INTERNATIONAL SALES AND SERVICE

Europe and the Middle East: +44 (0) 870-330-6101 For all other areas visit our website to find your nearest distributor.

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Dometic Varc User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual