Oil Return Control; Defrost Control - LG A2UW18GFA0 Svc Manual

4. Oil return control

Oil return operation recovers oil amount in compressor by collecting oil accumulated in pipe.
Each cycle component operates as shown on the below table during oil return operation.
Outdoor unit
Component
Compressor
Fan
EEV (Thermo on)
EEV (Thermo off)
4 way valve
Indoor unit
Component
Fan
Defrost signal

5. Defrost control

Defrost operation eliminates ice accumulated on heat exchanger, recovering performance of heat exchanger.
Each cycle component operates as shown on the below table during defrost operation.
Outdoor unit
Component
Compressor
Fan
EEV (Thermo on)
EEV (Thermo off)
4 way valve
Indoor unit
Component
Fan
Oil return signal
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Only for training and service purposes
Starting
Normal control
Normal control
Normal control
Min. Pulse
On
Starting
Normal control
Off
Starting
Normal control
Normal control
Normal control
Min. Pulse
On
Starting
Normal control
Off
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Part 3 Basic Control
Running
Setting value
Off
Setting value
Setting value
Off
Running
Off
On
Running
Setting value
Off
Setting value
Setting value
Off
Running
Off
On
Ending
Normal control
Normal control
Normal control
Min. Pulse
On
Ending
Normal control
Off
Ending
Normal control
Normal control
Normal control
Min. Pulse
On
Ending
Normal control
Off
LGE Internal Use Only