LG ARNU Series - Defrost Control

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Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2.1.2 Oil return control on heating mode
■ Oil return operation time : 3 min for running step
■ Min. frequency
• temp. out > -5˚C: 30Hz temp. out -5˚C: 40Hz
■ Starting condition:same as cooling mode
Inv Compressor
Fan
Main EEV
4way valve
Subcooling EEV
Min. frequency
0Hz
Full open
On → off
min.
StartingComponent
Sub unit
compressor
All off
Hot gas bypass
valve
On
60 Hz
High pressure
control
Full open
Off
min.
Running
On
On
Min. Hz
High pressure
control
Base pulse
On
min.
Ending
Off
On
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
Function