SterlingTEK A0551797 manual Allow time to cool and reset

Page 78

Problem

Possible Cause

Solution

 

 

Allow time to cool and reset.

 

 

Check for high/low voltage.

 

 

Voltage must be within plus

 

Compressor internal overload

or minus ten percent (±10%)

 

of nameplate rating.

 

open.

 

Check for poor compressor

 

 

 

 

electrical connections.

 

 

Check compressor rotation

 

 

on scroll compressors.

 

Compressor contactor

Repair or replace.

 

holding coil open.

Pump runs,

 

Defective fan motor.

Repair or replace.

compressor does not

Fan motor out on overload.

Reset and test.

(cont’d).

 

 

Defective freezestat.

Replace.

 

Refrigerant low.

Check the refrigerant charge.

 

Defective fan cycling control.

Replace.

 

 

Sight glass should be clear

 

Low refrigerant pressure

while comperssor runs. Call

 

switch contact open.

for service if bubbling or

 

 

foaming.

 

Defective pump motor

 

 

interlock to compressor

Repair or replace.

 

control circuit.

 

 

Broken wire in the

Locate and repair.

 

compressor control circuit.

 

 

 

Freezestat control setting is

Lower set point to 10°F (6ºC)

 

below the leaving water

Pump runs, compressor

too high.

temperature you want with at

 

least 15 degrees differential.

cycles at short intervals.

 

Check refrigeration charge;

 

Refrigerant is too low.

check refrigerant sight glass

 

for bubbles or a level in the

 

 

 

 

glass.

 

Improper water/glycol

Be sure the antifreeze

 

mixture protection is right for

Leaving water temperature is

mixture.

the process.

 

not at set point.

Defective freezestat control.

Replace.

 

Refrigerant charge is low.

Call service to find and repair

 

the leak. Add refrigerant.

 

 

 

 

Check for partially closed

Pump pressure is too high.

Restricted water flow.

valves etc. Be sure all lines

 

 

are properly sized.

Page 78 of 86

SSC Series Central Chilling Stations

Page 77 Page 79
Image 78
Page 77 Page 79
Contents SSC Series Central Chilling Stations SSC Series Central Chilling Stations Safety Considerations Wear Safety Glasses and Work GlovesTable of Contents Startup Checklists Getting Started on the SSC Series Advanced TouchscreenCharts and Figures Introduction Necessary DocumentsStandard Features Models CoveredStandard Features on Remote Condensers Available OptionsModel Number Nomeclature Typical Two-Circuit 60-100 Ton Water Cooled Chiller Model SSCW-xxxCooling Capacity tons @ 50F 10 C LWT 73.1 81.4 Typical Two-Circuit 60-100 Ton Remote Air Cooled Chiller Model SSCR-xxxSscr Series Remote Condenser Models Unpacking and Inspection Event of Shipping DamagesIf the Shipment is Not Complete If the Shipment is Not CorrectReturns Uncrating Your New Chiller SSC Series Central Chilling Stations 3Installation Installation Location ConsiderationsMaking Electrical Connections SSC Series Central Chilling Stations Piping Considerations Making Process Water ConnectionsAll Models Making Tank Piping Connections From ProcessWater Treatment Considerations Water Connection Sizing ConsiderationsGalvanic Corrosion Considerations Making Water-Cooled Condenser ConnectionsInstalling the Remote Air-Cooled Condenser Condenser WaterChecking Motor Direction CompressorSSC Series Central Chilling Stations Lead-Lag Compressors AlarmsStaging Lead-Lag PumpsChilled Water Circuit Refrigeration CircuitFreezestat Control Volume Freezing Protection CurveFlow Switch High Pressure CutoutLow Pressure Cutout Chilled Water Manifold Control NippleControl Probe Condenser Water ManifoldSSC Series Central Chilling Stations Startup Checklists Water-Cooled SSC Series Startup ChecklistSSC Series Central Chilling Stations Remote Air-Cooled SSC Series Startup Checklist Water-Cooled SSC Series StartupSSC Series Central Chilling Stations Remote Air-Cooled SSC Series Startup Determining Flow Rate ShutdownSSC Series Central Chilling Stations SSC Series Central Chilling Stations Indicator Lights and Control Switches MMI Graphic Panel DevicesSSC Series Central Chilling Stations Using the Standard Touchscreen InterfaceTouchscreen Interface Introduction MMI Using the SSC Series Standard Touchscreen Interface SSC Series Standard Control PanelMain Menu Screen Viewing and Operating Chiller Compressors Viewing Compressor StatusCompressor Status Screen Chiller Configuration Screen Operating the chiller compressorsCompressor Enable Screen Compressor Lead/Lag ScreenViewing Compressor Run Times Compressor Run Time Display ScreenViewing and Operating Chiller Pumps Viewing Chiller Pump StatusPump Status Screen Pump Enables Screen Operating Chiller PumpsViewing Pump Run Times Pump Lead/Lag ScreenPump Run Time Display Screen Viewing Active Alarms and Handling Alarm Conditions Alarm Condition ScreenOr Death Viewing and Setting System Temperatures Setting System TemperaturesSSC Series Central Chilling Stations Using the Advanced Using the SSC Series Advanced Touchscreen Interface Main Menu Screen Viewing and Operating Chiller Compressors Chiller Status Screen Operating the chiller compressors Viewing Compressor Run Times Viewing and Operating Chiller Pumps Viewing Chiller Pump Status Operating Chiller Pumps Hourmeters Pump Run Time screen displays Viewing Active Alarms and Handling Alarm Conditions Alarm Condition Screen Or Death System Status Screen Temperature Input Display Screen Condenser Maintenance LubricationMakeup Valve Evaporator MaintenancePump Motor Seal Recommended Pump Tank Spare PartsPreventive Maintenance Service SSC Series Central Chilling Stations 10Troubleshooting Problem Possible Cause SolutionAllow time to cool and reset Verify proper rotation if Service Notes Index Water Treatment Service Notes Service Notes Service Notes Parts Department Sterling Th Street New Berlin, WI 262 641-8610 ∙ Fax 262
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