Trane CXAJ series Installation, Operation And Maintenance Manual page 56

Troubleshooting
The compressor operates without stop
Possible Cause
(1) The unit energy cannot bear
load (cannot reach the unloading
water temperature).
(2) The temperature probe or the
control circuit is poor.
(3) The electromagnetic
contactor of the compressor is
faulty.
(4) The valve block of the
compressor leaks (the exhaust
pressure is low, and the suction
pressure is high).
(5) The refrigerant is insufficient
(the capacity gets small, the
superheating capacity is too
high, sub-cooling capacity is
too low, and the low pressure is
low).
The compressor motor winding is open-circuited
Possible Cause
(1) The evaporator load is
too high (the water return
temperature is high)
(2) The motor cooling is not
enough (the superheat is too
high).
(3) The compressor voltage is
improper.
(4) The parts inside the
compressor is damaged.
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Handling Method
Inspect the cause of excessive load
Replace the temperature probe.
Replace or repair the control circuit.
Repair or replace the electromagnetic contactor.
Replace the compressor.
Find out and repair the refrigerant leakage point, and recharge the refrigerant.
Handling Method
Inspect the following items:
a. The water flow is too high.
b. The water return temperature is too high.
Inspect the following items:
a. The expansion valve is improperly set.
b. The expansion valve is faulty.
c. The liquid pipe is blocked.
Inspect the following items:
a. The supply voltage is too low or unbalanced.
b. The power wire is loose.
c. The electromagnetic contactor of the compressor is poor.
Replace the compressor.