The Phenomena From Main Component Failure; Compressor - LG MULTI V 5 Manual Book

The phenomena from main component failure

1. The Phenomena from Main Component Failure
1. The phenomena from main component failure
The phenomena from main component failure
Component Phenomenon Cause
Not operating Motor insulation broken
Strainer clogged

Compressor

Oil leakage
Stop during running Motor insulation failure
Abnormal noise R-S-T misconnection
during running
High pressure error Motor failure,
Outdoor
in cooling mode bad ventilation around
fan
operation outdoor heat exchanger
Heating failure, fre- Bad connector contact
quent defrosting
No operation sound Coil failure
Outdoor after switching ON
EEV
the power supply
Heating failure, EEV clogged
frozen outdoor heat
exchanger part
Low pressure error EEV clogged
or discharge temper-
ature error
When system fault occurs, the error code is displayed on the indoor unit display or remote control display. The
trouble shooting guide is available in the service manual.
• When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok.
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
150
_TROUBLE SHOOTING GUIDE BOOK
Check method and Trouble shooting
Check resistance between terminals and
chassis
Change strainer
Check Oil level after opening oil port
Check resistance between terminals and
chassis
Check compressor R-S-T connection
Check the fan operation to confirm proper
motor functioning. Switch OFF the outdoor
unit and remove obstacles, if any, around
the HEX. Check connector
Check resistance between terminals
Service necessary
Service necessary
- 84 -
LGE Internal Use Only
2. Compressor
2.1 Failure Judge Method
1. Error display (CH21, CH22, CH26, CH29)
- Failure to restart after power reset
1-2. 압축기 불량 판단
- Main power supply failure from inverter board to compressor
- Compressor input current is normal but compressor fails to start
 CH21, CH22, CH26, CH29
with electric noise from inverter board
전원 Reset 후 재기동 여부 확인
•
- CH29 in normal operation and cycle
• 압축기에 Inv보드에서 전원 인가 확인.
2. Phase current , input current hunting •
압축기 기동시 인버터 보드에서 전자기음과 함께 압축기에 투입되는 전류가 상승함에도 압축기 기동 안함.(CH26
- The phase current, input current value is hunting more than 5A in
• 정상 운전 중 cycle의 특이한 변화가 없는데도 CH29 발생
stable state of high / low pressure and compressor Hz
 상전류/입력전류 헌팅
고/저압 및 압축기 Hz가 고정되어 있으나 상전류 or 입력전류 값이 ±5 A 이상으로 헌팅할 경우 압축기 손상 판단
3. Coil resistance (U-V, V-W, W-U) and insulation resistance measurement •
- Insulation resistance : 50MΩ or more
 압축기 상간 저항 및 절연 저항 측정
- Coil resistance : refer to below
JQC068MA *
Temp. 25 ℃
U-V 0.216 ± 7 % Ω 0.258 ± 7 % Ω
V-W 0.216 ± 7 % Ω 0.258 ± 7 % Ω
W-U 0.216 ± 7 % Ω 0.258 ± 7 % Ω
JQC048MA *
Temp. 25 ℃
U-V 0.302 ± 7 % Ω 0.360 ± 7 % Ω
V-W 0.302 ± 7 % Ω 0.360 ± 7 % Ω
W-U 0.302 ± 7 % Ω 0.360 ± 7 % Ω
2.2 Failure Cause
· Failure to obtain discharge superheat (refrigerant overcharging)
· High discharge temperature (refrigerant shortage)
· Failure to obtain high and low pressure difference
· Defective compressor
· Foreign substance inflow
· Overload operation
· Nitrogen / Vapor inflow and poor vacuum
· Defective oil return valve
· Oil return piping blocked
· Defective VI EEV
· Defective oil balancing valve
· Oil shortage due to oil leakage
· Lack of oil due to frequent Thermo On / Off
LGE Internal Use Only
75 ℃
75 ℃
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