Sterling SCW Series installation manual Troubleshooting

Page 68

10

Troubleshooting

 

 

 

 

 

 

Problem

Possible Cause

Solution

 

No power.

Check main disconnect,

 

fuses, wiring, and power lead

 

 

to unit.

 

Wrong voltage supplied to

Voltage must be within plus

 

or minus ten percent (±10%)

 

unit.

 

of nameplate rating.

 

 

 

Defective On/Off switch.

Replace switch.

 

 

Replace fuse, check

 

 

transformer, check wiring for

 

Control circuit fuse blown.

loose wires, check for shorted

 

coils on contactors and

 

 

Unit does not run.

 

solenoids, check crankcase

 

 

heater.

 

Defective control transformer.

Replace.

 

Flow switch circuit is open.

Check pump for proper

 

rotation.

 

 

 

Pump motor off on overload.

Reset and test motor.

 

 

Check that the chiller pump is

 

Unit is off on flow switch or

running.

 

Check that all valves are

 

pressure switch.

open.

 

 

Check for defective flow

 

 

switch or pressure switch.

 

Freeze control set higher than

Lower freeze control setting

 

temperature of liquid in

to 10°F (6ºC) below the

 

leaving temperature you

 

system.

 

want.

 

 

 

 

Air cooled units: Check and

 

 

clean air filters. Check

 

 

condenser fans for proper

Pump runs,

 

rotation. Check for dirty

 

condenser. Check for

compressor does not.

High pressure refrigerant

condenser air obstruction.

 

Check for tripped motor

 

cutout switch contacts open.

overload, blown fuses, or bad

 

 

condenser fan motor.

 

 

Water cooled units: Check for

 

 

water valves turned on.

 

 

Check for dirty condenser.

 

 

Check water flow through

 

 

condenser.

Page 68 of 77

SCW Series Central Chilling Stations

Page 67 Page 69
Image 68
Page 67 Page 69
Contents SCW Series Central Chilling Stations SCW Series Central Chilling Stations Safety Considerations Wear Safety Glasses and Work GlovesTable of Contents Startup Checklists Indicator Lights and Control Switches MMIViewing and Operating Chiller Pumps Charts and Figures Introduction Necessary DocumentsStandard Features Models CoveredStandard Features on Remote Condensers Available OptionsModel Number Nomeclature Typical Two-Circuit 60-195 Ton Water Cooled Chiller Nominal water flow gpm460/3/60 Vf Typical Two-Circuit 60-195 Ton Remote Air Cooled Chiller 460/3/60Scwr Series Remote Condenser Models Unpacking and Inspection Event of Shipping DamagesIf the Shipment is Not Complete If the Shipment is Not CorrectReturns Bill of lading Packing listUncrating Your New Chiller SCW Series Central Chilling Stations Installation Location Considerations Making Electrical ConnectionsCheck Compressor Rotation Before Starting Unit To Process Piping ConsiderationsMaking Process Water Connections Making Tank Piping Connections Water Connection Sizing Considerations Galvanic Corrosion ConsiderationsWater Treatment Considerations Making Water-Cooled Condenser ConnectionsCondenser Water Out Installing the Remote Air-Cooled CondenserCondenser Water Water Pump Checking Motor DirectionCompressor Condenser Fan Alarms StagingLead-Lag Compressors Lead-Lag PumpsFreezestat Control Chilled Water CircuitRefrigeration Circuit Freezing Protection Curve Percent byFlow Switch High pressure cutout settingHigh Pressure Cutout Low Pressure CutoutControl Nozzle Control ProbeChilled Water Manifold Optional Condenser Water ManifoldSCW Series Central Chilling Stations Startup Checklists Water-Cooled SCW Series Startup ChecklistSCW Series Central Chilling Stations Water-Cooled SCW Series Startup Remote Air-Cooled SCW Series Startup Checklist SCW Series Central Chilling Stations Remote Air-Cooled SCW Series Startup Fan Set on Set off Number Psi KPa BarsDetermining Flow Rate ShutdownIndicator Lights and Control Switches MMI Graphic Panel DevicesSCW Series Central Chilling Stations Operator Interface Introduction Using the StandardOperator Interface Using the SCW Series Standard Operator Interface SCW Series Standard Control PanelViewing and Operating Chiller Pumps Viewing Active Alarms and Handling Alarm Conditions Viewing and Setting System TemperaturesSetting System Temperatures Touchscreen Interface Introduction MMI Using the AdvancedTouchscreen Interface Using the SCW Series Advanced Touchscreen Interface Viewing Compressor Status Main Menu ScreenChiller Status Screen Chiller Configuration Screen SCW Series Central Chilling Stations Compressor Run Time Display Screen Viewing Chiller Pump Status Pump Status Screen Pump Enables Screen Pump Run Time Display Screen Pumps Alarm Condition Screen Viewing and Setting System Temperatures System Status Screen Temperature Input Display Screen Condenser Maintenance LubricationRemote Air-Cooled Water-CooledEvaporator Maintenance Pump Motor SealMakeup Valve Recommended Pump Tank Spare PartsPreventive Maintenance Service SCW Series Central Chilling Stations Troubleshooting Problem Possible Cause Solution Verify proper rotation if Service Notes Index Determining Flow RateSCW Series Central Chilling Stations Service Notes Service Notes Service Notes Technical Assistance Parts Department
Top Page Image Contents