LG Multi V ARWM072CAS5 Service Manual page 37

n Example. Slave2 ODU inverter compressor failure (For Heat Recovery System)
Close Open
Heating mode
Slave2
Liquid Low High
Pipe pressure Pressure
Gas Pipe Gas Pipe
1. Close liquid pipe and low pressure gas pipe of the unit for pump out operation.
2. Operate pump out
3. Close high pressure gas pipe of unit after completion
4. End pump out
5. After replacing the compressor, eliminate remaining refrigerant of corresponding ODU and perform vacuum
work. (with vacuum mode)
6. Add the refrigerant with auto charging function
Heating mode
Slave1
Liquid Low High
Pipe pressure Pressure
Gas Pipe Gas Pipe
Liquid pipe
Low Pressure Gas pipe
High Pressure Gas pipe
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Heating mode
Master
Liquid Low
Pipe pressure
Gas Pipe
Service Port
Function
High
Pressure
Gas Pipe