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8. TROUBLESHOOTING
Compressor motor
overload
1) Voltage excessively high or excessively low
2) Discharge temperature excessively high
3) Recovered water temperature excessively
high
4) Motor or wiring short-circuit
1) Check whether the voltage matches with
the value of the pertain equipment. If nec-
essary, correct disparity
2) Check discharge pressure and find cause
for the excessive pressure
3) Find the cause of excessive temp. of recov-
ered water
4) Check insulation resistance between wire
and wiring block for the ground line
Compressor motor
coil winding tem-
perature high
1) Voltage excessively high or excessively low
2) Discharge pressure excessively high
3) Recovered cooling water temperature ex-
cessively high
4) Motor coil winding temperature abnormal
5) Insufficient amount of refrigerant in the sys-
tem
1) Check whether the voltage matches with
the value of the pertain equipment. If nec-
essary, correct disparity
2) Check discharge temperature, find cause,
and solve problem
3) Find cause and solve problem
4) Check contact condition of element in com-
pressor temperature sensor wiring block
under refrigerated condition
(Compressor should be stopped over 10
minutes.)
5) Check the cause of refrigerant leakage
Compressor low
pressure switch ac-
tivated
1) Refrigerant liquid pipe filter clogged
2) Expansion unit defect
3) Insufficient refrigerant charge
4) Liquid outlet valve is not fully opened.
1) Check or repair strainer or filter
2) Check expansion unit
3) Replenish refrigerant
4) Open valve
Noise generated
from compressor
Liquid refrigerant is flowing from evaporator to
compressor.
Check expansion valve and degree of super-
heat after controlling liquid refrigerant until the
liquid refrigerant disappears in the evaporator
Impossible to run
compressor
1) Protection operating or compressor control
circuit fuse blew out.
2) Control circuit contact defect
3) Interrupt power supply
4) Compressor relay coil winding burn out
5) Wrong rotation direction
1) Find cause of protective action and solve
problem. Restart chiller
2) Check control circuit and repair
3) Check power supply
4) Replace
5) Exchange 2 phases to match with the rota-
tion direction
Impossible to acti-
vate unloading sys-
tem
1) Chilled water outlet temperature setting ab-
normal or temperature sensor defect
2) Unloading electronic valve defect
3) Compressor damaged
1) Adjust control temperature setting or re-
place temperature sensor
2) Check electronic valve coil winding and
check whether oil path is clogged
3) Check element of unloading machine
Summary of Contents for LCWW
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