Outdoor Fan & Fan Motor - LG MULTI V 5 Manual Book

8. Outdoor Fan & Fan Motor
8.1 Outdoor Fan
1. The outdoor fan is controlled by the inverter motor which can control the number of rotations.
2. The outdoor fan is controlled by the high/low pressure of the outdoor unit after the operation of
compressor.
3. There is possibility that the outdoor fan does not operate due to low capacity operation or low outdoor
temperature even if the compressor is operating. This does not mean breakdown of the unit, the fan will
start operating if it reaches the set point.
8.2 Fan Motor
Checking Item Symptom
1. The fan motor 1) When power sup-
does not operate. ply is abnormal
2. Vibration of the
fan motor is large
2) For wrong wiring
3) For failure of motor * Measure winding resistance of the motor coils.
4) For failure of circuit
board
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Countermeasure
* Modify connection status in front of or at the rear
of the breaker, or if the power terminal console is
at frosting condition.
* Modify the power supply voltage is beyond speci-
fied scope.
* For following wiring.
1. Check connection status.
2. Check contact of the connector.
3. Check that parts are firmly secured by tightening
screws.
4. Check connection of polarity.
5. Check short circuit and grounding.
- UX3 : 19Ω ±7 %(@25℃)
- UX2 : 14.2Ω ±7 %(@25℃)
* Replace the circuit board in following procedures
if problems occur again when powering on and if
there are no matters equivalent to items as speci-
fied in above 1) through 3).(Carefully check both
connector and grounding wires when replacing the
circuit board)
1. Replace only fan control boards.If starting is done,
it means that the fan control board has defect.
2. Replace both fan control board and the main
board. if starting is done, it means that the main
board has defect.
3. If problems continue to occur even after coun-
termeasure of No.1 and No.2, it means that both
boards has defect.
8.3 Checking Method (Flow Chart)
Checking start
Contact of the signal
No
section of IPM
Replace the fan IPM board
and power supply unit is
normal?
Yes
Fan still works during Fan still works during
No
operation of the heating low operation of the cooling
pressure less than high pressure more than
700kPaG? 2700kPaG?
Yes Yes
No malfunction of outdoor fan
No
Replace the fan motor
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