LG RCWW Operation & Maintenance Manual page 116

8. TROUBLESHOOTING
116
1) Voltage excessively high or excessively low
2) Discharge temperature excessively high
Compressor motor
3) Recovered water temperature excessively
overload
high
4) Motor or wiring short-circuit
1) Voltage excessively high or excessively low
2) Discharge pressure excessively high
3) Recovered cooling water temperature ex-
Compressor motor
coil winding tem- cessively high
perature high
4) Motor coil winding temperature abnormal
5) Insufficient amount of refrigerant in the sys-
tem
1) Refrigerant liquid pipe filter clogged
Compressor low
2) Expansion unit defect
pressure switch ac-
3) Insufficient refrigerant charge
tivated
4) Liquid outlet valve is not fully opened.
Liquid refrigerant is flowing from evaporator to
Noise generated
from compressor
compressor.
1) Protection operating or compressor control
circuit fuse blew out.
2) Control circuit contact defect
Impossible to run
compressor 3) Interrupt power supply
4) Compressor relay coil winding burn out
5) Wrong rotation direction
1) Chilled water outlet temperature setting ab-
Impossible to acti-
normal or temperature sensor defect
vate unloading sys-
2) Unloading electronic valve defect
tem
3) Compressor damaged
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
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
1) Check or repair strainer or filter
2) Check expansion unit
3) Replenish refrigerant
4) Open valve
Check expansion valve and degree of super-
heat after controlling liquid refrigerant until the
liquid refrigerant disappears in the evaporator
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
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