Sterlco GC Series Central Chiller - Manual (Page 49)

GC Series Central Chillers Chapter 6: Troubleshooting 49 of 79
Controller Alarm Possible Cause Solution
High Level Warning (optional:
will only become active if level
sensor is enabled in Supervisor
Menu)
Fluid level in pump tank is above
warning setpoint Remove fluid from pump tank to
achieve a minimum of 18 in (46 cm)
above the pump suction centerline
while the pump is operating
Compressor Differential Pressure
Fault Condenser inlet temperature too
low Contact ACS Group Aftermarket
Service for assistance
VFD fault See VFD Fault above
Condenser water regulating valve
open Verify analog output at Y1
High Suction Pressure Warning Load may be too high for chiller Contact your sales representative for
assistance.
Low Discharge Pressure Warning Condenser inlet temperature too
low Contact ACS Group Aftermarket
Service for assistance
VFD fault See VFD Fault above
Condenser water regulating valve
open Verify analog output at Y1
Low Fluid Temp Warning Dirty evaporator Clean evaporator inlet strainer
Back flush evaporator
Hot gas bypass valve malfunction Verify wiring at EV Connection B1-4
Low Level Warning (optional: will
only become active if level sensor
is enabled in Supervisor Menu)
Fluid level in pump tank is below
warning setpoint
Add fluid to pump tank to a minimum
of 18 in (46 cm) above the pump
suction centerline while the pump is
operating
Compressor Differential Pressure
Warning
Condenser inlet temperature too
low
Contact ACS Group Aftermarket
Service for assistance
VFD fault See VFD Fault above
Condenser water regulating valve
open
Verify analog output at Y1
Low Suction Pressure Warning Refrigerant undercharge Contact refrigeration technician about
adding refrigerant as needed
Refrigerant leak Contact refrigeration technician about
repairing lead and adding refrigerant as
needed
Electronic expansion valve closed Verify wiring EV Connection A1-4 on
EVD
Low fluid flow through evaporator Verify evaporator inlet and outlet
butterfly valve position to achieve 10°F
(5.6°C) differential across evaporator
Clean evaporator inlet strainer
Verify evaporator pump operation
Leaving fluid temperature close to
Fluid Freezepoint Setpoint Verify Fluid Freezepoint setpoint and
glycol/water mixture for proper
freezing temperature
Pump Down Override Time
Expired Electronic valve malfunction Verify wiring EV Connection A1-4 on
EVD
Optional Hot gas bypass valve
malfunction Verify wiring EV Connection B1-4 on
EVD
Pump Flow Sensor Failure Input to PLC is missing Verify wiring at ID3 on PLC
M12 connector on cable separated
from sensor Reconnect M12 connector to top of
sensor.
Faulty sensor cable Replace cable
Faulty sensor Replace sensor
Refrig Liquid Temp Sensor
Failure Input to PLC is missing Verify wiring at EVD
Faulty sensor Replace sensor
Refrig Suction Temp Sensor
Failure Input to PLC is missing Verify wiring at EVD
Faulty sensor Replace sensor
Tank Level Sensor Failure Packard connector separated from
sensor Reconnect wire connector to sensor
Input to PLC is missing Verify wiring at PLC