Sterling 882.93092.00 specifications GP Series Portable Chillers Troubleshooting

Page 40

Chapter 6: Troubleshooting

Problem

Possible cause

 

No power.

 

 

 

Wrong voltage supplied to unit.

 

 

 

Defective display.

Unit does not run.

Control circuit fuse blown.

 

 

 

 

Defective control transformer.

 

Piping flow switch circuit open.

 

 

 

Pump motor off on overload.

 

Leaving fluid setpoint set higher

 

than temperature of liquid in

 

system.

 

Compressor internal overload or

 

fuses are open.

Pump runs; compressor does not.

 

Compressor contactor holding coil

 

open.

 

Defective compressor auxiliary

 

contact.

 

Broken wire in the compressor

 

control circuit.

 

 

 

Plugged Y-strainer

Pump runs, compressor cycles at

Hot gas not coming on

short intervals.

 

 

 

 

Low water flow

 

 

 

Water/glycol mixture inadequate

 

for process.

Water temperature is too high.

Improperly set leaving fluid

temperature, warning, or fault set

 

 

point

 

Refrigerant charge is low.

 

 

Solution

Check main disconnect, fuses, wiring, and power lead to unit.

Voltage must be within plus or minus 10% of nameplate rating.

Replace.

Replace control circuit fuse. Check transformer.

Check for a short circuit. Replace.

Add water or water/glycol solution as required.

Reset and test.

Lower the leaving fluid temperature below the leaving temperature you desire.

Allow time to cool and reset, then check for high/low volt-age. It must be within plus or minus 10% of the nameplate rating.

Check for open fuses and loose compressor electrical connections.

Repair or replace.

Repair or replace.

Locate and repair.

Clean

Check hot gas analog output value through status screen. Contact Service if output value remains at 0% throughout compressor cycle.

Install bypass between to-and-from process line

Make sure that the water/glycol mixture protection is right for the process.

Adjust.

Call service to find and repair the leak, then have refrigerant added.

GP Series Portable Chillers

Chapter 6: Troubleshooting

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Contents GP Series Portable Chillers Shipping Information Table of Contents Appendix How to Use This Manual SafetySafety Symbols Used in this Manual Responsibility Functional Description Models Covered in This ManualGeneral Description Chilled Water CircuitMechanical Features Standard FeaturesElectrical Features Safety Devices and Interlocks Refrigeration FeaturesController Features Other FeaturesOptional Features Flow SwitchHigh Pressure Cutout Remote Start/Stop InterlockMounting Features Optional Pump Amperages Voltage Construction Full Load Amps Uncrating InstallationElectrical Connections Process Water Connections Bypass Valve ConsiderationsGalvanic Corrosion Considerations Water Treatment ConsiderationsCondenser Considerations Water-Cooled Chiller CondensersAir-Cooled Chiller Condensers Remote Air-Cooled Chiller CondensersPage Page Equivalent Length in Feet for Valves and Fittings Total Equiv GP Series Portable Chillers Installation Discharge Line Sizing Refrigerant Charge Determination Three-Phase Compressors Checking Motor DirectionWater Pumps Condenser FanWater Reservoir Part Number DescriptionPump Automatic Water Make-Up Option Finishing Setup Setting Up PasswordsInitial Start-Up Page Page Operation Panel Buttons, Indicator Lights, and SwitchesMicroprocessor Controller Main Status Screen Status Screens Operator Setpoints ScreenPage Access Levels Controller Setpoints Alarms Optional CommunicationsPage GP Series Portable Chillers Operation Maintenance Filter CleaningLubrication Maintaining the CondenserMaintaining the Evaporator Preventative Maintenance ServiceEvaporator Process Piping Y-Strainer Troubleshooting GP Series Portable Chillers TroubleshootingGP Series Portable Chillers Troubleshooting Warranty Returns AppendixReturned Material Policy Credit ReturnsService Department Technical AssistanceParts Department Sales DepartmentSpecifications Air-Cooled Portable ChillersPAC-20 PAC-30PAC-40 PAC-50GPAC-70 GPAC-105 TON GPAC-140GPAC-175 GPAC-210PWC-20 Water-Cooled Portable ChillersPWC-30 PWC-40 PWC-50GPWC-70 GPWC-105 GPWC-140GPWC-175 GPWC-210Pump Curves, Flow, and Pressure Considerations Hertz Pump CurvesModel GP70 GP90 ALL 50 Hz Capacity liter/minACS Chiller Pumps Pure Water at 40F GPM DP PSIRemote Air-Cooled Chiller Configurations Typical Ductwork for Air-Cooled Chillers Page Piping Diagrams GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix
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