Special Control; Oil Return Control - LG MULTI V M ARNU07GTU 4 Series Svc Manual

2. Special control

2.1 Oil return control

2.1.1 Oil return control on cooling mode
Oil return operation recovers Oil level in compressor by collecting oil accumulated in pipe.
Each cycle component operates as shown on the below table during oil return operation.
MULTI V M
Component
Inverter compressor
Fan
Main EEV
Subcooling EEV
4way valve
Indoor Unit
Component
Fan
Thermo on unit EEV
Thermo off unit EEV
Oil return signal
n Oil return operation time : 3 min for running step
n Starting condition : Every 8 hours operate
n Oil return process ends if compressor protection control starts
Starting
30Hz
Normal control Normal control
Max. pulse
Min. pulse
OFF
Starting
Normal control
Normal control
Normal control Normal control
40 pulse
OFF
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Running
Setting Value
Normal control
Max. pulse
Min. pulse
OFF
Running
Normal control
Normal control
400 pulse
ON
Function
Ending
30Hz
Max. pulse
Min. pulse
OFF
Ending
40 pulse
OFF