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LG Multi V 5 Guide Book

LG Multi V 5
133 pages
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176 177
_TROUBLE SHOOTING GUIDE BOOK _
12. Pressure Switch
In the pressure
condition that the pressure
switch is not working,
the compressor is stopped
suddenly?
The operation is
normal?
Start operating after cut off the
power of pressure switch
PCB checking and replacement
Replace the pressure switch
Checking start
No malfunction of the pressure
switch
Yes
Yes
Yes
No
No
Caution
When the long-term operation to turn off the power of the pressure switch,
you can receive a fatal damage to the components and piping systems.
13. Main PCB
13.1 Failure Judge Method
1. Error code check
Error Code Error diagnosis
-
·Check restart after power reset
·Check main PCB power supply.
CH50 ·Check N-phase wrong connection of power supply.
CH53
· Check communication PCB (Indoor/Outdoor) connection harness
(24pin), Main
- External PCB communication harness(6pin, Blue) connection condi
-
tion
CH86 ·Check the EEPROM inserting (direction, pin break, etc.) condition
CH52, CH57, CH105
· Check Main - Inverter PCB communication harness(2pin, Blue) wrong
connection condition
CH145
· Check Main - External PCB communication harness(6pin, Blue) wrong
connection condition
2. Main PCB check
Check the power line connection status because it is not displayed in 7 segment
15. Main PCBA
1.1 불량 판단 방법
1) 에러 코드 확인
2) Main PCBA 확인
· 7세그먼트에 표시되지 않으므로 전원선 연결 상태 확인 (3Pin 파란색 커넥터-Main PCBA-노이즈 필터)
1.2 주요 불량 원인
· 고전압 인가 (T-N 494 V 이상, N 오결선 CH50 발생)
· 침투(컨트롤박스 프론트 판넬 열림 서비스창 열림 컨트롤박스 스크류 풀림 으로 인한 빗물 유입)
에러 코드 불량여부 판단
CH05, CH50,
CH52, CH53,
CH57, CH59,
CH86, CH104,
CH105, CH145
전원 Reset 재기동 여부 확인
Main PCB 전원 인가 확인
입력 전원 N 오결선 여부 확인 후에도 동일 Error 발생(CH50)
실내외기 통신 PCBA 연결 Harness(24Pin), Main-External 통신 Harness(10pin) 체결상태 확인 동일 Error 발생(CH53)
EEPROM 삽입 상태 재확인(방향, 꺽임 ) 후에도 동일 Error 발생(CH86)
Main-Inverter 통신 Harness(2pin, Blue) 결선 여부 확인 후도 동일 Error 발생(CH52, CH57, CH105)
Main-External 통신 Harness(6pin, Blue) 결선 여부 확인 후에도 동일 Error 발생(CH145)
Option PCB
DeBug
Series
Comm.
Pipe
Comm.
FLASH
WRITE
220 V
(INPUT)
Pressure
Switch
220 V
(INT)
220 V
(EXT)
COMM
(485 Comm.)
EXT
(Power, Comm.)
FLASH
(Short Key)
LG
MV
Leakage
Current
Basic Part
Multi V 5
Intorduction
Trouble Shooting
Function Control
Back
Basic PartBasic PartBasic PartBasic Part

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LG Multi V 5 Specifications

General IconGeneral
TypeVRF (Variable Refrigerant Flow)
RefrigerantR410A
Compressor TypeInverter Scroll Compressor
Outdoor Unit Fan TypeAxial Fan
Cooling Capacity22.4 kW to 270 kW
Energy EfficiencyHigh
Operating RangeCooling: -5°C to 48°C
Power Supply380-415V, 50/60Hz
Heat Exchanger TypeMicrochannel
Control TypeCentralized Control
Indoor Unit OptionsCassette, Wall Mounted, Ducted
Heat RecoveryAvailable
WarrantyVaries by region (typically 5 years compressor, 1-2 years parts)

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