Pump Out For Heat Recovery Systems - LG Multi V5 Service Manual

OTHER CONTROLS
Setting Optional Modes

Pump Out for Heat Recovery Systems

Example of Pump Out Function When Slave2 Outdoor Unit Experiences Inverter Compressor Failure.
Closed Open
Slave 2 Outdoor Unit
Heating Mode
Liquid Low
Pipe Pressure
Vapor Pipe
1. Verify the liquid pipe and low pressure vapor pipe of the outdoor
unit are closed for Pump Out operation. Open the high pressure
vapor pipe service valve.
2. Operate Pump Out function.
3. Close high pressure vapor pipe of unit after Pump Out is
complete.
4. Replace inverter compressor, eliminate remaining refrigerant of
the corresponding outdoor unit, and perform Vacuum procedure
using Vacuum Mode.
5. Add refrigerant using the Refrigerant Auto Charge Function.
78
Slave 1 Outdoor Unit
Heating Mode
High Liquid
Pressure Pipe
Vapor Pipe
Refrigerant Charging Valve
Due to our policy of continuous product innovation, some specifications may change without notification.
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Low High
Pressure Pressure
Vapor Pipe Vapor Pipe
Figure 28: Close Up of Heat Recovery Service Ports and Refrigerant
Charge Valve.
Liquid Pipe
Vapor Pipe
Master Outdoor Unit
Heating Mode
Liquid Low High
Pipe Pressure Pressure
Vapor Pipe Vapor Pipe
Service Ports