Sterling A0544325 installation manual Troubleshooting Guide, Problem Possible cause Solution

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8

Troubleshooting Guide

 

 

 

 

 

 

Problem

Possible cause

Solution

 

 

Check main disconnect

 

No power.

fuses, wiring, and power lead

 

 

to the unit.

 

Wrong voltage supplied to

Voltage must be within plus

Chiller will not run.

or minus 10% of the

the chiller.

nameplate rating.

 

Defective on/off switch.

Replace.

 

Control circuit fuse blown.

Replace, check the

 

transformer.

 

 

 

Defective control transformer.

Replace.

Pump runs, compressor

No process load on the

Increase the process load.

chiller.

cycles at short intervals.

 

Refrigerant is low.

Check the refrigerant charge.

 

 

Refrigerant is low.

Check the refrigerant charge.

 

 

Make sure that the coolant

The leaving water

 

solution is right for the

Improper water/glycol

process — must be 75%

temperature is too high.

solution.

water and 25% glycol.

 

 

 

See Figure 5 on Page 17 for

 

 

more information.

Pump pressure is low (see

Check for foreign matter.

Clean the system.

pump curves).

 

 

Pump pressure is too high.

Restricted water flow.

Check for partially closed

valves, etc. Be sure all lines

 

 

are properly sized.

SMC Series Chillers

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Contents SMC-050 to SMC-150 Series SMC Series Chillers Safety Considerations Table of Contents Table of Contents Charts and Figures Introduction General InformationNecessary Documents Models CoveredUncrating Your New Chiller Available OptionsEvent of Shipping Damages If the Shipment is Not CompleteIf the Shipment is Incorrect Returns SMC050A Process Pump CurvesSMC100A Process Pump Curves SMC150A Process Pump Curves SMC-150 25,400 16,000 12A 345 SMC Series Chiller SpecificationsChiller Installation Electrical ConnectionsProcess Water Connections Water Reservoir SMC Condenser Air SupplyEthylene Glycol Curve Overhead Piping Overhead Process ConsiderationsSequence of Operation Chilled Water CircuitRefrigeration Circuit High Pressure Cutout Low Pressure CutoutRemote Start/Stop Interlock SMC Component Identification End of unit piping Piping Schematic 1 Pump with ReservoirPiping Schematic 1 Pump without Reservoir Piping Schematic No Pump, No Reservoir SMC Startup Checklist SMC Pre-Startup ChecklistSMC Water Circuit Pressure Drop Table Setting the Process Water Temperature Setting the Alarm ValueMicroprocessor Control SP AL SMC ControlIndicator Lights SwitchesOptional Graphic Panel Optional Graphic Panel SMC SeriesCondenser Maintenance Routine MaintenanceLubrication Typical SMC Subpanel Typical SMC Wiring Schematic SMC Wiring Schematic for Chillers with No Pump or Reservoir SMC Series Chillers Problem Possible cause Solution Troubleshooting GuideProblem Possible cause Solution Description SMC Spare Parts ListService Notes Service Notes Sterling/Sterlco Milwaukee, WI5200 West Clinton Avenue 414 Fax 414
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