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Part 3. Basic Control
- 34 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Outdoor unit
Oil return operation recovers oil amount in compressor by collecting oil accumulated in pipe.
Each cycle component operates as shown on the below table during oil return operation.
4. Oil return control
Defrost operation eliminates ice accumulated on heat exchanger, recovering performance of heat exchanger.
Each cycle component operates as shown on the below table during defrost operation.
5. Defrost control
Component Starting Running Ending
Compressor Normal control Setting value Normal control
Fan Normal control Off Normal control
EEV (Thermo on) Normal control Setting value Normal control
EEV (Thermo off) Min. Pulse Setting value Min. Pulse
4 way valve On Off On
Component Starting Running Ending
Fan Normal control Off Normal control
Defrost signal Off On Off
Outdoor unit
Component Starting Running Ending
Compressor Normal control Setting value Normal control
Fan Normal control Off Normal control
EEV (Thermo on) Normal control Setting value Normal control
EEV (Thermo off) Min. Pulse Setting value Min. Pulse
4 way valve On Off On
Component Starting Running Ending
Fan Normal control Off Normal control
Oil return signal Off On Off
Indoor unit
Indoor unit
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