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CH5000 & CH7500 Chiller Operator's & Installation Manual
Trouble
Chiller does not operate. Control
power light "off"
Pump does not operate. pump
power light "off"
Pump does not operate. Pump
power light "On".
Chiller does not cool. Cooling light
"Off".
Chiller does not operate. Cooling
light "On".
Low pressure alarm light cycles
on/off.
High pressure alarm light "On".
Low temperature alarm
Publication Number: 91961OPR
TROUBLESHOOTING
Table 3.
Probable Cause
A. Control power switch "Off".
B. No power.
C. Defective power supply connection.
D. Defective control power switch.
E. Defective control transfromer.
A. Pump power switch "Off".
B. Defective pump power switch.
C. Defective control transformer.
A. No water in reservoir.
B. Restriction in the line to or from the
chiller.
C. Open or defective pump overload relay.
D. Defiective pump contactor.
E. Defective pump motor or damaged
impller.
A.
Defective thermostat.
A. Process water too cold.
B. Low process water flow.
C. Defective expansion valve.
D. Refrigerant loss.
E. Water bypass valve failed.
F. Defective pump.
A. Restricted condenser airflow.
B. Defective condenser fan and/or motor.
C. Defective expansion valve.
D. Low or no condenser water flow.
A. Low or no process liquid flow.
B. Defective thermostat.
C. Process water too cold – below 35
- 14 -
Remedy
A. Turn the control power switch to the
"On" position.
B. Check the fuse or circuit breaker.
C. Check wiring and correct loose or
poor connections.
D. Replace the switch.
E. Replace the transformer.
A. Turn the pump power switch to the
"On" position.
B. Replace the switch.
C. Replace the transformer.
A. Fill reservoir.
B. Remove restriction.
C. Manually reset the relay or replace if
necessary and check amp setting
on overload.
D. Replace the pump contactor.
E. Replace the pump or impeller.
A.
Replace thermostat.
A. Increase the thermostat setting.
B. Ensure that there is adequate flow
through the process piping.
C. Replace the expansion valve.
D. Check the sight glass. If bubbles are
seen flowing through it, the chiller
needs to be leak checked and
recharged with refrigerant.
E. Consult Technical Service Depart-
ment.
F. Replace pump.
A. Clean the fins of the condenser and
ensure that the air flow is not
restricted.
B. Check to ensure that the fan blade
is not blocked. Replace the fan
motor if necessary.
C. Check to ensure that the fan blade
is not blocked. Replace the fan
motor if necessary.
D. Ensure that there is adequate flow
throught piping to condenser.
A. Ensure that there is adequate flow
through the process piping.
B. Replace the thermostat.
o
C. Increase the thermostat setting.
F
.
© 2006-2011, IMI Cornelius Inc.
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