LG ARNU Series - Oil Equalizing Control

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Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
■ Ending condition
1) All Heat exchanger pipe temperature are above 15˚C for 30 sec.
2) The running time of defrost operation is over 30% of the total heating time
3) If liquid injection begins.
2.3 Oil equalizing control
2.3.1 Oil equalizing control on cooling mode
■ Ending condition
1) About 4min after control begins
■ Starting condition:every 2hours operation with constant compressors.
Fan Off
StartingIndoor unit
Thermo on unit
EEV
Oil return
pulse
Off
Running
Oil return operation
pulse
Off
Ending
Return to
base pulse
Thermo off unit
EEV
Heating close pulse
Oil return operation
pulse
Heating close pulse
Inv Compressor
Fan
Main EEV
4way valve
Subcooling EEV
Equalizing control
High pressure
control
Full open
Off
Subcooling control
StartingComponent
Sub unit
compressor
Equalizing control
Hot gas bypass
valve
Off
Equalizing control
High pressure
control
Full open
Off
Subcooling control
Running
Equalizing control
Off
Equalizing control
High pressure
control
Full open
Off
Subcooling control
Ending
Equalizing control
Off
Fan Normal
StartingIndoor unit
Thermo on unit
EEV
Normal
Normal
Running
Normal
Normal
Ending
Normal
Thermo off unit
EEV
min. pulse min. pulse min. pulse
Function