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Symptom
D. Compressor short cycles.
Probable Cause
1. Intermittent Contact
in control circuit.
Symptom
E. Compressor runs continuously.
Probable Cause
1. Unit undersized for
load (cannot maintain
water temperature).
2. Thermostat setpoint
too low.
3. Defective thermostat
or control wiring.
wiring.
4. Welded contacts on
compressor contactor. contactor.
5. Leaky valves in
compressor (indicated
by abnormally low
discharge and high
suction pressures).
6. Shortage of refrigerant Find and repair refrigerant
(indicated by reduced
capacity, high super-
heat, low subcooling
and low suction
pressure).
Symptom
F. Compressor motor winding stat open.
Probable Cause
1. Excessive load on
evaporator (indicated
by high supply water
temperature).
62
Troubleshooting
Recommended Action
Check for the following:
a. Defective relay contacts.
b. Loose wiring
connections.
Recommended Action
Check for cause of
excessive load.
Readjust thermostat.
Replace thermostat.
Replace or repair control
Repair or replace
Replace compressor.
leak. Recharge system.
Recommended Action
Check for the following:
a. Excessive water flow.
b
. High return water
temperature.
2. Lack of motor cooling
indicated by excessive
superheat).
3. Improper voltage at
compressor.
4. Internal parts of
compressor damaged.
Symptom
G. Compressor is noisy.
Probable Cause
1. Internal parts of
compressor damaged
or broken (compressor
knocks).
2. Liquid flood-back
(indicated by
abnormally cold suction
line and low superheat.
3. Liquid refrigerant in
compressor at start-up
(indicated by
abnormally cold
compressor shell).
Symptom
H. System short of capacity.
Probable Cause
1. Low refrigerant charge Add refrigerant.
(indicated by high
superheat and low sub-
cooling).
(Continued on next page)
Check for the following:
a. Improper expansion
valve setting.
b. Faulty expansion valve.
c. Restriction in liquid
line.
Check for the following:
a. Low or imbalanced line
voltage.
b. Loose power wiring.
c. Defective compressor
contactor.
Replace compressor.
Recommended Action
Replace compressor.
Check and adjust
superheat.
Check crankcase heater.
Check for refrigerant
overcharge.
Recommended Action
CSRA-SVX01A-EN
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