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Only for training and service purposes

LGE Internal Use Only

Air Conditioner Service Manual

TABLE OF CONTENTS

Part 1 General Information ..........................................................................................................3

1. Safety Precautions........................................................................................................4

2. Model Line Up................................................................................................................7

3. Nomenclature ..............................................................................................................10

Part 2 Functions & Controls......................................................................................................14

1. List of Functions & Accessory ..................................................................................15

2. Air Flow .......................................................................................................................17

3. Air Purifying.................................................................................................................19

4. Installation Functions.................................................................................................20

5. Reliability .....................................................................................................................21

6. Convenience Functions & Controls .........................................................................22

7. Special Function & KIT...............................................................................................29

Part 3 Basic Control ..................................................................................................................32

1. Normal operation ........................................................................................................33

2 Compressor control ....................................................................................................33

3. EEV( Electronic Expansion Valve) control ..............................................................33

4. Oil return control ........................................................................................................34

5. Defrost control ...........................................................................................................34

6. Protection control ......................................................................................................35

Part 4 Test Run..........................................................................................................................36

1. Check before Test Run .............................................................................................37

2. Test Run Flow chart ..................................................................................................38

3. Test Runing.................................................................................................................39

Part 5 Trouble Shooting Guide ...............................................................................................41

1. Self-diagnosis Function .....................................................................................42

2. Pump Down .........................................................................................................44

3. Evacuation...........................................................................................................45

4. Gas Charging ......................................................................................................46

5. Cycle Part ............................................................................................................47

6. Electronic Parts...................................................................................................48

LG LMN078HVT User Manual

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