Special Control; Oil Return Control - LG ARUN Series Service Manual

Function

2. Special control

2.1 Oil return control

2.1.1 Oil return control on cooling mode
Oil return operation recovers oil amount in compressor by collecting oil accumulated in pipe.
Each cycle component operates as following table during oil return operation.
Outdoor Unit
Component
Inv Compressor
Constant Speed Compressor
FAN
Main EEV
Subcooling EEV
4way valve
Hot gas bypass valve
Indoor Unit
Component
Fan
Thermo on unit EEV
Thermo off unit EEV
Oil return signal
I Oil return operation time : 3 min for running step
I Starting condition:every 6 hours operate
I Oil return process ends if compressor protection control starts
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Only for training and service purposes
Starting
25Hz Setting Value
OFF
Normal control Normal control
Max. pulse
Normal control
OFF
Normal control Normal control
Starting
Normal control
Normal control
Min. pulse
OFF
- 24 -
Running
ON
Normal control
Max. pulse Max. pulse
Main. pluse 100 pulse
OFF
Normal control
Running
OFF Normal control
1200 pulse Normal control
1200 pulse Min. pulse
ON
LGE Internal Use Only
Ending
40Hz
OFF
OFF
Ending
OFF