Sterling specifications GP Series Portable Chillers, Troubleshooting, 35 of

Problem	Possible cause
Pump pressure low (refer to curves	Pump running in reverse.
for normal pressure for various
pumps).
	Check for foreign matter.
Pump pressure is too high.	Restricted water flow.
	Restricted condenser air flow.
Unit runs continuously, but not
	Unit low on refrigerant.
enough cooling power.	Compressor not operating
	efficiently.
	Unit under-sized for application.

Solution

Verify rotation; if running in reverse rotation, reverse any two main power leads. Re-verify for correct pump rotation.

Clean the system.

Check for partially closed valves etc. Make sure that all lines are properly sized.

Clean filters. Clean condenser.

Check the refrigerant charge.

Call service.

Call sales rep.

GP Series Portable Chillers Chapter 6: Troubleshooting 35 of 44