Sterlco GP Series 20-60 HP Packaged Chillers - Manual (Page 58)

GP Series Portable Chillers Chapter 6: Troubleshooting 58 of 93
CC = Compressor Critical SC = System Critical PC = Process Critical W = Warning
Alarm Name # Type Possible Cause Solution
High Level Fault 24 W
Fluid level higher than
parameter setting.
Verify value in parameter
Too much fluid in system
Open drain valve and remove
some fluid from system so that
level is below high level fault.
Tank sensor failure Replace sensor
High Level Warning 25 W
Fluid level higher than
parameter setting. Verify value in parameter
Too much fluid in system
Open drain valve and remove
some fluid from system so that
level is below high level
warning.
Tank sensor failure Replace sensor
Compressor Differential Pressure
Fault
26 CC
Low discharge pressure or
high suction pressure Contact customer service
High Suction Pressure Warning 27 W
From Process fluid
temperature too high Verify flow through system.
Make corrections as necessary.
Low Discharge Pressure Warning 28 W
Ambient air or condenser
water temperature too low
Verify ambient air temperature
and air flow or condenser inlet
water temperature.
Too little refrigerant in
system. Contact customer service for
service call
Water cooled condenser valve
stuck open Verify cooling valve operation.
Fan VFD output at 100%
Verify VFD is in remote versus
manual operation. Verify
controller output to VFD.
Low Fluid Temp Warning 29 W
Low Level Warning 30 W
Fluid level lower than
parameter setting.
Verify value in parameter. Add
fluid to the system if necessary
Optional Water Makeup valve
failure
Verify wiring between
controller and makeup valve.
Replace valve if necessary
Tank sensor failure Replace sensor
Compressor Differential Pressure
Warning
31 W
Low discharge pressure or
high suction pressure Contact customer service
Low Suction Pressure Warning 32 W
System low on refrigerant Contact Customer Service
Liquid line valves closed
Verify wiring or output between
controller and valve
Chilled fluid setpoint too
close to freeze protection
setpoint. Adjust setpoint or fluid
freezepoint temperature (will
require adding glycol to fluid)
Process fluid flow rate too
low. Verify system valve operation
and adjust if necessary
Thermal expansion valve
failure. Contact Customer Service
Pump Down Override Time
Expired
33 W
Liquid line valve open Contact customer service
Hot gas bypass valve open