Sterlco GP Series 20-60 HP Packaged Chillers - Manual (Page 61)

GP Series Portable Chillers Chapter 6: Troubleshooting 61 of 93
Problem Possible cause Solution
Pump runs; compressor does not.
Leaving fluid setpoint set higher
than temperature of liquid in
system.
Lower the leaving fluid temperature
below the leaving temperature you
desire.
Compressor internal overload or
MCP is open.
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 loose compressor electrical
connections.
Failed compressor motor
Compressor contactor holding coil
open.
Repair or replace.
Defective compressor auxiliary
contact.
Repair or replace.
Broken wire in the compressor
control circuit.
Locate and repair.
Pump runs, compressor cycles at
short intervals.
Plugged Y-strainer Clean
Hot gas not coming on
Check hot gas analog output value
through status screen. Contact Service
if output value remains at 0%
throughout compressor cycle.
Low process water flow
Check internal bypass valve to verify it
is open and free of debris.
Install bypass between to-and-from
process line
Unit runs continuously, but not
enough cooling power
.
Restricted condenser air flow.
Clean filters.
Clean condenser.
Unit low on refrigerant.
Check the refrigerant charge by viewing
sight glass on liquid line upstream of the
expansion valve.
Compressor not operating
efficiently.
Call service.
Unit under-sized for application. Call sales rep.