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

GP Series Portable Chillers Chapter 6: Troubleshooting 60 of 93
CC = Compressor Critical SC = System Critical PC = Process Critical W = Warning
Alarm Name # Type Possible Cause Solution
Pump 2 Overload 53 SC/W
Motor circuit protector open
Verify motor circuit protector
operation. Verify motor wiring
and amp draw while under load.
Pump flow rate in excess of
capacity
Verify system valves are
operational and properly set.
Contact customer service or
sales if pump is sized too small
for application.
High Temp Safety Switch 54 PC
Heater failure
Verify operation of heater and
cooling valve. .
Cooling Valve failure
Verify wiring at cooling valve
and at terminal bloc
Sensor failure Replace sensor if necessary.
Phase Monitor Fault 55 SC
Unit wired incorrectly
Reverse two wires at line-side
of power switch on electrical
panel.
Loss of phase during
operation
Verify sensor wiring at sensor
and at terminal bloc.
Sensor failure Replace sensor if necessary.
From Proc Sensor Failure 56 W
Sensor wires loose from
controller terminal block Verify wiring at sensor and at
terminal block. y.
Sensor wires broke between
sensor and controller terminal
block.
Replace sensor if necessar
Non-Controller Related Issues
Problem Possible cause Solution
Unit does not run.
No power.
Check main disconnect, fuses, wiring,
and power lead to unit.
Wrong voltage supplied to unit.
Voltage must be within plus or minus
10% of nameplate rating.
Control circuit fuse blown.
Replace control circuit fuse.
Check transformer.
Check for a short circuit.
Defective control transformer. Replace.
Piping flow switch circuit open.
Add water or water/glycol solution as
required.
Pump motor off on overload. Reset and test.