LG ARNU Series - 2 Special Control; Oil Return Control

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Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2.1 Oil return control
2.1.1 Oil return control on cooling mode
■ Oil return operation time : 3 min for running step
■ Starting condition:every 6 hours operate
Inv Compressor
Fan
Main EEV
4way valve
Subcooling EEV
45 Hz
0Hz
Full open
Off
min.
StartingComponent
Sub unit
compressor
All off
Hot gas bypass
valve
Off
60 Hz
High pressure
control
Full open
Off
min.
Running
On
Suction pipe temp.
control
40 Hz
High pressure
control
Full open
Off
min.
Ending
Off
Off
Fan Keep state
StartingIndoor unit
Thermo on unit
EEV
Oil return
pulse
Keep state
Running
Oil return operation
pulse
Keep state
Ending
Return to
base pulse
Thermo off unit
EEV
Close pulse
Oil return operation
pulse
Close pulse
2. Special control
Function