LGRED Heat General Service Manual

Part 3. Basic Control

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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