Sterling GP Series - Manual (Page 35)

GP Series Portable Chillers Chapter 6: Troubleshooting 35 of 44
Problem Possible cause Solution
Pump running in reverse.
Verify rotation; if running in reverse
rotation, reverse any two main power
leads. Re-verify for correct pump
rotation.
Pump pressure low (refer to curves
for normal pressure for various
pumps).
Check for foreign matter. Clean the system.
Pump pressure is too high. Restricted water flow.
Check for partially closed valves etc.
Make sure that all lines are properly
sized.
Clean filters.
Restricted condenser air flow.
Clean condenser.
Unit low on refrigerant. Check the refrigerant charge.
Compressor not operating
efficiently.
Call service.
Unit runs continuously, but not
enough cooling power
.
Unit under-sized for application. Call sales rep.