LG Multi V 5 Guide Book

180 181
_TROUBLE SHOOTING GUIDE BOOK _
14.2 Failure Cause
14.3 Precautions of Replacement
14.3 Check Point after Replacement
1. High voltage (T-N more than 484V, N phase wiring fault) → CH50
2. Rainwater inflow by Control box / Front Panel / Service port open, Control box screw loosening
3. Part short by foreign substance
4. Defective PCB / Diode / Resistance / Capacitor / Regulator
1. Be sure to use the main PCB suitable for the model (Check P/No)
2. Be sure to turn off the power and wear insulated gloves before touching the PCB.
3. Use box or bag only for PCB.
4. If on-boarding is required after replacement, check the program and EEPROM C/Sum (especially when
using an alternate Main PCB)
1. Check whether there is any abnormality when the cycle is stabilized at cooling or heating mode.
2. Check current Hz control according to target Hz
3. Check that the target high / low pressure is reached
15. Inverter PCB
15.1 Failure Judge Method
1. Error code check
Error Code Error diagnosis
- · Checking restart after power reset
CH52, CH57
· Even after checking 220V connection condition for Inverter SMPS
power supply
CH52, CH57, CH105
· Even after checking Main - Inverter PCB communication
harness(2pin, White) connection condition
CH23, CH50
· Even after checking R, S, T connection harness condition (Open,
Wrong connection) and connection sequence.
CH21 · Even after replacing compressor
CH21, CH26 · Even after checking U, V, W connection condition
CH60
· Even after checking EEPROM inserting (direction, pin break, etc.)
condition.
2. Inverter PCB check
17. Inverter PCBA
1.1 불량 판단 방법
1.2 주요 불량 원인
· 고전압 인가 (T-N 494 V 이상, N상 오결선) → CH50 발생
· 압축기 내부 모터 절연 파괴
에러 코드 불량 여부 판단
CH21, CH22, CH23, CH25, CH26,
CH29
, CH40, CH49, CH50, CH52,
CH57
, CH60, CH62, CH65, CH71,
CH105
•
전원
Reset
후 재기동 여부 확인
•Inverter SMPS
전원 인가용
220V
결선 여부 확인 후에도 동일
Error
발생
(CH52, CH57)
•Main-Inverter
통신
Harness(2pin, White)
결선 여부 확인 후도 동일
Error
발생
(CH52, CH57, CH105)
•
입력
R, S, T
연결
Harness
체결 상태
(Open,
덜체결
),
체결 순서 확인 후 에도 동일불량 발생
(CH23, CH50)
•
압축기 교체 후에도 동일 불량 발생
(CH21).
•
압축기 출력 선
U, V, W
체결 상태
(
미체결
,
덜체결
)
확인 후에도 동일불량 발생
.(CH21, CH26)
•EEPROM
삽입 상태 재확인
(
방향
,
핀 꺽임 등
)
후에도 동일
Error
발생
(CH60)
Comm._in Comm._Out Fan_15 V
SMPS
Micom.
IGBT
Drive IC
Reactor
Fan DCLink
Debugger
Shortkey
LGMV
Reactor
Film Cap.
W
V
U
T
S
R
Basic Part
Multi V 5
Intorduction
Trouble Shooting
Function Control
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Basic PartBasic PartBasic PartBasic Part

LG Multi V 5 Specifications

General

Type	VRF (Variable Refrigerant Flow)
Refrigerant	R410A
Compressor Type	Inverter Scroll Compressor
Outdoor Unit Fan Type	Axial Fan
Cooling Capacity	22.4 kW to 270 kW
Energy Efficiency	High
Operating Range	Cooling: -5°C to 48°C
Power Supply	380-415V, 50/60Hz
Heat Exchanger Type	Microchannel
Control Type	Centralized Control
Indoor Unit Options	Cassette, Wall Mounted, Ducted
Heat Recovery	Available
Warranty	Varies by region (typically 5 years compressor, 1-2 years parts)