Sterling specifications GP Series Portable Chillers Troubleshooting

Chapter 6: Troubleshooting

Problem	Possible cause
	No power.
	Wrong voltage supplied to unit.
	Defective on/off switch.
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.
	Defective leaving fluid sensor
	High/Low thermostat.
	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.

Replace.

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

Replace relay board on control bed hot gas coil

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 34 of 44