HP A0554832 manual HP Portable Chillers Troubleshooting

Page 41

Chapter 6: Troubleshooting

Problem

Possible cause

Solution

 

No power.

Check main disconnect, fuses, wiring,

 

and power lead to unit.

 

 

 

Wrong voltage supplied to unit.

Voltage must be within plus or minus

 

10% of nameplate rating.

 

 

 

Defective on/off switch.

Replace.

Unit does not run.

Control circuit fuse blown.

Replace control circuit fuse.

Check transformer.

 

 

 

Check for a short circuit.

 

Defective control transformer.

Replace.

 

Piping flow switch circuit open.

Add water or water/glycol solution as

 

required.

 

 

 

Pump motor off on overload.

Reset and test.

 

High/Low thermostat set higher

Lower thermostat stage 1 set to 10°F

 

than temperature of liquid in

(6°C) below the leaving temperature

 

system.

you want.

 

Defective High/Low thermostat.

Replace.

 

Low refrigerant indicator on.

Check refrigerant charge.

 

 

Sight glass should be clear and the

 

 

moisture indicator should be green

 

Refrigerant low pressure switch

while compressor is running. Bubbles or

 

foaming is normal when the hot-gas by-

 

contacts open.

 

pass solenoid is energized. Call for

 

 

 

 

service if bubbling is occurring and/or

 

 

moisture indicator is yellow.

 

 

Clean the air filters.

 

Refrigerant high-pressure indicator

Check condenser fans for proper

 

rotation.

 

on.

Pump runs; compressor does not.

Check for dirty condenser.

 

 

Reset and test.

 

 

 

Fan motor out on overload.

Reset and test.

 

Defective fan cycling control.

Replace.

 

Defective fan motor.

Repair or replace.

 

 

Allow time to cool and reset, then check

 

 

for high/low volt-age. It must be within

 

Compressor internal overload or

plus or minus 10% of the nameplate

 

fuses are open.

rating.

 

 

Check for open fuses and loose

 

 

compressor electrical connections.

 

Compressor contactor holding coil

Repair or replace.

 

open.

 

 

 

Defective pump motor to

Repair or replace.

 

compressor auxiliary contact.

 

 

 

Broken wire in the compressor

Locate and repair.

 

control circuit.

 

 

Pump runs, compressor cycles at

Incorrect High/Low Thermostat

Lower set point to 10°F (6°C) below

short intervals.

setting.

desired leaving water temperature.

2-40 HP Portable Chillers

Chapter 6: Troubleshooting

41 of 78

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Contents Hp Portable Chillers Shipping Information Table of Contents Operation HP Portable Chillers Safety Symbols Used in this Manual SafetyHow to Use This Manual Responsibility Wear Safety Glasses and Work GlovesModels Covered in This Manual Functional DescriptionRefrigeration Circuit General DescriptionChilled Water Circuit Other Mechanical Features Standard FeaturesMechanical Features Refrigeration Features Electrical FeaturesController Features Other FeaturesHigh/Low Thermostat Control Safety Devices and InterlocksCrankcase Heater High Pressure CutoutFan Cycling Switch Oil Pressure Safety SwitchPressure Switch Flow SwitchOptional Features Mounting Features Optional Pump Amperages Voltage Construction Full Load Amps Electrical Connections InstallationUncrating Bypass Valve Considerations Process Water ConnectionsGalvanic Corrosion Considerations Water Treatment ConsiderationsAir-Cooled Chiller Condensers Condenser ConsiderationsWater-Cooled Chiller Condensers Remote Air-Cooled Chiller Condensers Page Equivalent Length in Feet for Valves and Fittings Refrigerant Charge Determination Chiller Condenser Charge Field Installed Piping ChargeChecking Motor Direction Three-Phase CompressorsWater Pumps Condenser FanPart Number Description Water ReservoirEthylene Glycol and Propylene Glycol Curves Automatic Water Make-Up Option Initial Start-Up E5CK Controller Indicator Name Description Panel Buttons, Indicator Lights, and SwitchesOperation Microprocessor ControllersSterlco 2000 Controller Indicator Name Description Indicator Name Description2000 Graphic Panel See on Indicator Name DescriptionIndicator Name Description With Sterlco 2000 Controller Typical Graphic Panels With E5CK ControllerAuto-Tuning Setting the Process Water TemperaturesStart-up Optional CommunicationsProgramming the Electronic High/Low Thermostat Thermostat Buttons Indicator Name DescriptionStage 1 Freeze Protection Stage 2 High Temperature ProtectionSelect Fahrenheit or Celsius Lubrication MaintenanceFilter Cleaning Maintaining the Evaporator Maintaining the CondenserEvaporator Process Piping Y-Strainer Air- and Remote Air-Cooled ChillersPreventative Maintenance Service HP Portable Chillers Troubleshooting TroubleshootingHP Portable Chillers Troubleshooting Appendix WarrantyTechnical Assistance Service DepartmentParts Department Sales DepartmentHp and 3 1/2 hp Air-Cooled Portable Chillers Drawings and SpecificationsHp and 7.5 hp Air-Cooled Portable Chillers Hp and 15 hp Air-Cooled Portable Chillers 20 hp, 25 hp, and 30 hp Air-Cooled Portable Chillers In. NPT Height Width Depth Lbs Hp and 3.5 hp Water-Cooled Portable ChillersNominal Condenser water Nominal cooling Water Com Hp and 7.5 hp Water-Cooled Portable Chillers Hp and 15 hp Water-Cooled Portable Chillers 20 hp, 25 hp, and 30 hp Water-Cooled Portable Chillers Hp and 40 hp Water-Cooled Portable Chillers Hp and 7.5 hp Remote Air-Cooled Portable Chillers Nominal cooling Com Refrigeration Power in amps e12.8 17.3 748Nominal cooling Com Refrigeration Hp and 15 hp Remote Air-Cooled Portable ChillersPres Nom Connections 15.0 40.9 34.0 74.7To/from No tank Tank, to/from Height Width Depth Lbs Hp through 40 hp Remote Air-Cooled Portable Chillers‘A’in ‘B’in ‘C’in ‘D’in ODSin Remote Condenser Assembly ModelsHertz Pump Curves Pump Curves, Flow, and Pressure ConsiderationsDWG. No. S0554823 Calculating Chiller Nominal Flow and Pressure to Process Water Pressure Drop TablesFlow and Pressure Considerations Recirculation Pump SpecificationsRecirc. power Flow Rate ∆ pressure Gpm Lpm Psi KPa Configuration B Configuration C Remote Air-Cooled Chiller ConfigurationsConfiguration a Typical Ductwork for Air-Cooled Chillers Central and Gravity Return Piping with Standpipe Diagram Piping DiagramsTypical Piping Schematic, 2 and 3 1/2 hp Models HP Portable Chillers Appendix HP Portable Chillers Appendix Typical Piping Schematic, 5 hp through 40 hp, No-Pump Models HP Portable Chillers Appendix Time-delay Relays Disconnect Switch Optional Electrical SchematicsTypical Electrical Subpanel Speed FusesTypical Electrical Schematic, 2 hp and 3 1/2 hp Models A0554815 Typical Power Wiring Schematic, 5 hp through 40 hp ModelsHP Portable Chillers Appendix DWG A0554931 DWG A0562343 DWG A0562435 Typical Wiring Schematic, 35 hp and 40 hp Models with Pump DWG A0562434
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