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12
91961OPR
WARNING: If repairs are to be made to the refrigeration system, make sure electrical power
is disconnected from the unit.
TROUBLESHOOTING
IMPORTANT: Only qualified personnel should service internal components or electrical wiring.
Trouble Probable Cause Remedy
CHILLER DOES NOT
OPERATE. CONTROL
POWER LIGHT “OFF”
A. Control power switch “off”. A. Turn the control power switch to
the “on” position.
B. No power. B. Check the fuse and circuit
breaker.
C. Defective power supply
connection.
C. Check wiring and correct loose or
poor connections.
D. Defective control power
switch.
D. Replace the switch.
E. Defective control transfromer. E. Replace the transformer.
F. 3–Phase Monitor tripped F. Check for correct voltage level on
each phase of incoming 3–Phase
power. Check for correct phase
rotation.
PUMP DOES NOT OPERATE.
PUMP POWER LIGHT “OFF”
A. Pump power switch “off”. A. turn the pump power switch to the
“on” position.
B. Defective pump power switch. B. Replace the switch.
C. Defective control transformer. C. Replace the transformer.
PUMP DOES NOT OPERATE.
PUMP POWER LIGHT “ON”.
A. No water in reservoir. A. Fill reservoir.
B. Restriction in the line to or
from the Chiller.
B. Remove restriction.
C. Open or defective pump
overload relay.
C. Manually reset the relay or
replace if necessary and check
amp setting on overload.
D. Defective pump contactor. D. Replace the pump contactor.
E. Defective pump motor or
damaged impeller.
E. Replace the pump or impeller.
CHILLER DOES NOT COOL.
COOLING LIGHT “OFF”.
A. Defective thermostat. A. Replace thermostat.
CHILLER DOES NOT
OPERATE. COOLING LIGHT
“ON”.
A. LOW PRESSURE ALARM
LIGHT CYCLES ON/OFF.
A. Process water too cold. A. Increase the thermostat setting.
B. Low process water flow. B. Ensure that there is adequate flow
through the process piping.
C. Defective expansion valve. C. Replace the expansion valve.