Special Control; Oil Return Control - LG Multi V Water IV ARNU07GTU 2 Series Service 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.
Outside Unit
Component
Inv Compressor
Main EEV
Subcooling EEV
4way valve
Indoor Unit
Component
Fan
Thermo on unit EEV
Thermo off unit EEV
Oil return signal
■ Oil return operation time : 3 min for running step
■ Starting condition : When low oil level which is measured by oil level sensor is kept continuously then oil
return operation will be start.
■ Oil return process ends if compressor protection control starts
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Only for training and service purposes
Starting
30Hz
Upper : Min. pulse Upper : Min. pulse
Low : Max. pulse Low : Max. pulse
Min. pulse
OFF
Starting
Normal control
Normal control
40 pulse
OFF
- 19 -
Running
Setting Value
Upper : Normal control
Low : Normal control
20 pulse
OFF
Running
OFF Normal control
Normal control Normal control
400 pulse
ON
LGE Internal Use Only
Function
Ending
30Hz
80 pulse
OFF
Ending
40 pulse
OFF