Sterlco GP Series 5-15 HP Portable Chillers - Manual (Page 56)

GP Series Portable Chillers Chapter 6: Troubleshooting 56 of 93
CC = Compressor Critical SC = System Critical PC = Process Critical W = Warning
Alarm Name # Type Possible Cause Solution
Low Discharge Pressure Fault 8 CC
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 Fault 9 CC
Low process fluid flow
Verify system valve operation
and adjust if necessary
Plugged Y-strainer
Clean y-strainer through blow-
down valve or cleaning internal
strainer.
Low Suction Pressure Fault 10 CC
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
Low Superheat Fault (only will
appear if optional sensor pack is
installed)
11 CC
Thermal expansion valve
failure Contact Customer
Temperature Sensor Failure
Verify sensor wiring between
controller and sensor.
Suction Pressure Sensor Failure 12 CC
Sensor failure
Check the wiring connection at
the sensor, and at the controller.
If necessary replace sensor.
Electrical connection at
sensor open
Electrical connection at
controller open
Leaving Water Temp Sensor
Failure
13 SC
Sensor wires loose from
controller terminal block Check the wiring connection at
the controller terminal block
Sensor wires broke between
sensor and controller terminal
block.
Replace Sensor
Low Level Fault 14 SC
Tank level too low
Verify tank level parameters.
Add fluid if necessary.
Optional water makeup valve
failure
Verify wiring between
controller and makeup valve.
Replace valve if necessary
Tank level sensor failure Replace Sensor
No Flow 15 SC
System valve(s) closed
Verify that all system valves are
operational and adjust.
Low flow sensor failure
Verify the sensor at the sensor
and at the terminal block.
Pump failure
Verify the operation of the
pump (i.e. motor circuit
protector or pump rotation)