050 051
_TROUBLE SHOOTING GUIDE BOOK _
3. Piping Diagrams
75
Multi V 5
Outdoor Units
Low HEX Defrost Operation
tt
EEV
Indoor Unit
Indoor HEX
Fan
EEV
Indoor Unit
Indoor HEX
Fan
t
t
Fan
Motor
Outdoor
Temperature
Sensor
Outdoor Unit HEX
Temperature Sensor
Outdoor Unit HEX
Temperature Sensor
Outdoor
Unit HEX
Temperature
Sensor
Low Hot
Vapor Valve
Sub 4-Way Valve
High Pressure
Sensor
Main 4-Way
Valve
Suction
Temperature
Sensor
Receiver
Receiver
Outlet
Low
Pressure Sensor
Comp 1
Discharge
Temperatue Sensor
Comp 2
Discharge
Temperatue Sensor
Oil Separator Oil Separator
Liquid Pipe
Temperature Sensor
Low Pressure Vapor Pipe
High / Low Pressure Vapor Pipe
Liquid Pipe
Inverter
Comp 1
Oil
Balance
Sub-Cooling Circuit
Outlet Temperature Sensor
Sub-Cooling HEX
Sub-Cooling Circuit Inlet
Temperature Sensor
SC
EEV
Accum
Pressure Switch
Upper Hot
Vapor Valve
Upper Outdoor EEV
Low Outdoor
EEV
Receiver
Inlet
SC
Suction
Oil Return
Heatsink
Active
Path
Comp 1 Vapor
Injection
Inverter
Comp 2
Comp 2 Vapor
Injection
Pressure Sensor
Pressure Switch
Temperature Sensor
Remarks
SVC Valve
Check Valve
EEV
Solenoid Valve
Strainer
High Temperature High Pressure Vapor
High Temperature High Pressure Liquid
High Temperature High Pressure Liquid (Conditional)
Low Temperature Low Pressure Vapor
■ Low HEX Defrost Operation
HR Unit
Piping Diagrams
- 59 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Piping Diagrams
s
s
s
ss
sss
s
s
s
s
s
Low pressure gas pipe
Liquid pipe
High pressure gas pipe
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
s
Solenoid
EEV
Sensor
A
B
C
D
1. HR Unit
Ⓐ : To be switched operation between cooling and heating by two Solenoid valve
Ⓑ : To be used decreasing noise according to sub-cooling of inlet and outlet of indoor unit
(Simultaneous operation)
Ⓒ : To prevent liquid charging between high pressure gas valve and HR unit at cooling mode
Ⓓ : To be controlled the pressure between high and low pressure pipe during operation switching
Piping Diagrams
- 59 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Piping Diagrams
s
s
s
ss
sss
s
s
s
s
s
Low pressure gas pipe
Liquid pipe
High pressure gas pipe
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
s
Solenoid
EEV
Sensor
A
B
C
D
1. HR Unit
Ⓐ : To be switched operation between cooling and heating by two Solenoid valve
Ⓑ : To be used decreasing noise according to sub-cooling of inlet and outlet of indoor unit
(Simultaneous operation)
Ⓒ : To prevent liquid charging between high pressure gas valve and HR unit at cooling mode
Ⓓ : To be controlled the pressure between high and low pressure pipe during operation switching
Temperature Sensor
Th3
Th2
Th1
Symbol Description PCB Connector
Th1 Sub Cooling In Temperature Sensor SN_SEN_02(SC_IN)
Th2 Sub Cooling Out Temperature Sensor SN_SEN_02(SC_OUT)
Th3 Luquid Receiver Temperature Sensor SN_SEN_02(LIQUID)
Basic PartBasic PartBasic PartBasic Part
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