Table of Contents
Advertisement
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.
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Dometic VARC series
Summary of Contents for Dometic VARC series
- Page 1 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...
-
Page 2: Table Of Contents
Table of Contents SYSTEM OVERVIEW ........7 INTRODUCTION ............ 3 System Power-up ..........7 PGD1 and PLDPRO NAVIGATION .... 2 Software Revision ......... 7 MODBUS ............7 TOUCHSCREEN NAVIGATION ....3 Startup ..............7 MAIN PAGE ............3 Operational Checks..........7 Chiller Enable .......... -
Page 3: Introduction
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. -
Page 4: Pgd1 And Pldpro Navigation
PGD1 and PLDPRO NAVIGATION 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. -
Page 5: Touchscreen Navigation
TOUCHSCREEN NAVIGATION MAIN PAGE Figure 3: Main Page 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. -
Page 6: Logo
Figure 4: Touch Locations on Screen 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. -
Page 7: General
GENERAL 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. Th is 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. -
Page 8: Freeze Temperature Setpoint
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. -
Page 9: Fault
Fault 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 OVERVIEW System Power-up oftware Revision... -
Page 10: Setpoints
SETPOINTS 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. -
Page 11: Chilled Water Pump
hilled 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 Water Pump The sea water pump will have a selectable operating mode between continuous operation or cycle with compressor operation. -
Page 12: Status Screen Navigation
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. - Page 13 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.
- Page 14 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.
- Page 15 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. Unit Address: 1 (Default) Switch to unit: Desired board address Menu G: Technician Some subscreens will require a password. Please contact Dometic for service password. Submenus:...
- Page 16 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. 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.
- Page 17 CW Return Input B001 Offsett 0.0 (Default) 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.
- Page 18 Current Address: 1(Default) Change Address to: 1(Default) Next Screen Unit Settings 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.
-
Page 19: Electrical Specifications
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... -
Page 20: Appendix I: Touchscreen Navigation
Appendix I: Touchscreen Navigation Figure 15 HILLER NABLE Figure 16... - Page 21 HILLER ETPOINTS Figure 17...
- Page 22 Figure 18 HILLER TAGE Figure 19...
- Page 23 Figure 20 PLC HMI Screen With an EEV installed you can monitor the valve position and view your suction pressure and temperature. Superheat setpoint and actual will be displayed.
- Page 24 RENDS Figure 21 Figure 22...
- Page 25 CTIVE LARMS Figure 23 LARM ISTORY Figure 24...
- Page 26 LARM Figure 25 Figure 26...
- Page 27 EMOTE UPPORT Figure 27 EMOTE NABLE Figure 28...
- Page 28 EMOTE ONFIGURATION Figure 29...
-
Page 29: Appendix Ii: Pgd1 & Pro Display Navigation Tree
Appendix II: PGD1 & PRO DISPLAY NAVIGATION TREE Main Status Screen Legend Main Status Screen Mode Off/Cool/Heat/ El Ht* * Asterisk indicates this item is only viewable when CW Supply Temp #.#°F activated in the factory settings. CW Return temp #.#°F CW Supply temp #.#°F... - Page 30 Program Setpoints Heating Temperature #.# °F Cooling Temperature #.# °F Electric Heat* Factory #°F See page 31 1-Stage Up #°F 1-Stage Down #°F Current Limiting Mode Normal/Boost/Econo Econo 4.0 Amps Technician Normal 10.0 Amps See page 29 SW Pump Control By Demand/By Unit On Startup Mode* Normal/Accel...
- Page 31 Program/Technician Information Service Contact Phone ###-###-#### Commission Date ##:## ##/##/## Commission VARC type Enter contact info Version & Date ##/##/## Name #### BIOS & Date ##/##/## Telephone No. ###-###-#### Boot & Date ##/##/## Update info? Yes/No Flash Ram # Kb Commission date ##:## ##/##/##...
- Page 32 Program/Technician/Service Settings Working Hour Set Set Point Reset to Zero? Hours Probe Adjustments Input Offset Value Compressor Yes/No CW Return B001 CW supply B002 SW Inlet B003 Chilled Water Pump Yes/No Probe adjust S1 offset #.# psig Stage Address Seawater Pump Yes/No S1 probe #.# psig...
- Page 33 Program/Factory Configuration Temperature Units °F/°C Pressure Units psi/bar Force clock enable Yes/No Clock mode 24h/12h I/O Configuration Disable Buzzer Yes/No Startup delay See page 36 Enable Unit by Digital Input On/Off Supervisor On/Off pLAN network On/Off Schedule On/Off Unit Control Custom 1 On/Off Factory...
- Page 34 Program/Factory/Factory Settings Factory Settings Compressor VARC Type None/VARC48/ Econo mode SW Yes/No 60/72/96 Minimum On Compressor Based on VARC type Minimum Off Refrigerant Based on compressor Min Time between Starts # s Power type 230 V / 16 A Load Up Time Power set 230 V / 30 A Frost Protection...
- Page 35 Program/Factory/Configuration/EVO Configuration 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 Enable/Disable Enable/Disable Enable/Disable Type Select Select Select Select Minimum #.# barg #.# barg Maximum #.# barg #.# barg Alarm Min.
- Page 36 Program/Factory/Configuration/Power + n1 Configuration Motor Type Select Set Defaults Yes/No Save to Custom Yes/No Data Comm. Timeout U.M. speed Hz/rps e Replacement Drive Replacement Do Nothing/Download Parameters Custom Num of Motor Poles Motor Control Mode PM Motor/AC Motor Vector/AC Motor (V/F) Motor base freq.
- Page 37 Program/Factory/Configuration/Power + n1 /Regulation 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...
- Page 38 Program/Factory/IO Configurations Analog Inputs Enable CW Return CW Supply SW Inlet On/Off On/Off On/Off Channel B001 B002 B003 Normal/High Res. Normal/High Res. Normal/High Res. Input Type Select/(On/Off) Select/(On/Off) Select/(On/Off) On/Off Direction Reverse/Direct Reverse/Direct Reverse/Direct Delay Time Value Open/Closed Open/Closed Open/Closed Select type Minimum Maximum...
- Page 39 Display Address 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...
-
Page 40: Appendix Iii Multistage Setup
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 &... - Page 41 Basic wiring diagram...
- Page 42 Repeat for each stage. In the unlikely event there is a difference between stages, PCB Scroll up or down to firmware will require re-flashing by a Dometic approved engineer Technician, if prompted for a password, 3156 Select Information Scroll down for...
- Page 43 Networking (1 of 3) 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 program on standard PLDPRO control Go to Technician Scroll down...
- Page 44 Networking (2 of 3) Step 1 Press and hold Up, Down and Enter simultaneously until screen changes, about 6 seconds 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 At this point screen may go blank, if it does, start...
- Page 45 Networking (3 of 3) Turn on all stages and individually make the following changes to each stage Go to Technician Scroll down Enter Technician Password 3156 Go to stage address Press enter until the cursor is on “Num of stages” change from 1 to the correct number of stages for current system.
-
Page 46: Appendix Iv Configuration & Setup
Appendix IV Configuration & Setup Setting Time and Date Press Prg button Scroll to Clock/Scheduler and press enter 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. -
Page 47: Enabling Electric Heat
Enabling Electric Heat Press Prg button Enter service password 3156 Scroll down to Electric Heat, enter to select, up or down to toggle setting. Enter to save... -
Page 48: Select Unit Of Temperature
Select Unit of Temperature 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... -
Page 49: Hmi Setup
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. -
Page 50: Deleting Old Program
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. - Page 51 3. Click delete project, then click yes to confirm. 4. The screen will display the following as it in progress of deleting:...
-
Page 52: Setting Screen Address, Time & Backlight
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. - Page 53 2. Select: Show system settings. 3. Use the Next or Back button to spin the wheel until you find “Set Device Address”.
- Page 54 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.
- Page 55 7. Use Next or Back to scroll to Display Settings. 8. Select Display Settings...
- Page 56 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.
- Page 57 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.
-
Page 58: 7" Touch Screen Connection
7” touch screen connection 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... -
Page 59: Activating Maintenance Mode
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. - Page 60 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.
-
Page 61: Enabling Via Touchscreen
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. - Page 62 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.
-
Page 63: Appendix V Alarm Table
Appendix V Alarm Table Alarm Alarm description Reset Delay System Action Corrective Action relay Check sensor for shorts and opens and Chilled Water Supply Sensor Manual Immediate Shuts off Unit compare temperature reading with digital Failure thermometer Check sensor for shorts and opens and Chilled Water Return Sensor Manual Immediate... - Page 64 Alarm Alarm description Reset Delay System Action Corrective Action relay Check for proper refrigerant charge as the system may be overcharged. EVD EVO Low Superheat Automatic Immediate Warning Signal Check water for low flow. Check EEV movement and functionality. EVD Evo Low Evaporation Check water flows.
- Page 65 Alarms Power+ n˚1 16:Drive disabled 17:Motor Phase 18:Fan Fault 19:Speed Fault Check the load 20:PFC Failure Check network control devices and cables 21:Overvoltage Check the input voltage and rectify the trouble. 22:Undervoltage Turns off Using a 1000 V megger, check the motor and 23:STO Detection Manual Immediate...
-
Page 66: Appendix Vi Default Parameters
CCW Return CCW Return Number of Stages Electric Heat Pwr Cycle Retain Mode Retain Mode Retain Mode Electric Heat Logo Dometic BLK Dometic BLK Dometic BLK Background Ocean Ocean Ocean Flow Switch High Pressure Switch \ow Pressure Switch Load Shedding... - Page 67 Cond Setpoint Deg F Cond Band Deg F Comp Speed Compressor PID Cntrl Seconds Alarm Setups CW High Temp Limit Setpoint Deg F Off Band (SP-) Deg F Retries Retry delay Minutes CW Freeze Limit Setpoint Deg F Off Band (SP+) Deg F Retries Retry delay...
-
Page 68: Appendix Vii I/O Table & Wiring Diagram
Appendix VII I/O Table & Wiring Diagram I/O # Board I/O Description Analog Inputs AI-1 Chilled Water Return AI-2 Chilled Water Supply AI-3 Condenser Outlet Refrigerant Temp AI-4 Suction Temperature AI-5 Discharge Temperature AI-6 Suction Pressure AI-7 Discharge Pressure Digital Inputs DI-1 High Pressure Switch (Optional) DI-2... -
Page 69: Varc Standard Wiring Diagram
VARC Standard Wiring Diagram Figure... - Page 70 NOTES...
- Page 71 NOTES...
- Page 72 DOMETIC MARINE DIVISION 2000 N. Andrews Ave. Pompano Beach, FL 33069 USA +1 954-973-2477 +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...
Need help?
Do you have a question about the VARC series and is the answer not in the manual?
Questions and answers