LG FM21AH UE3 - Table of Contents

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Only for training and service purposes

LGE Internal Use Only

Air Conditioner Service Manual

CONTENTS

Part 1 General Information .........................................................................................................2

1. Safety Precautions........................................................................................................3

2. Model Line Up................................................................................................................6

3. Nomenclature ..............................................................................................................11

Part 2 Functions & Controls.....................................................................................................13

1. List of Functions & Controls......................................................................................14

2. Air Flow .......................................................................................................................16

3. Air Purifying.................................................................................................................18

4. Installation Functions.................................................................................................19

5. Reliability .....................................................................................................................23

6. Convenience Functions & Controls .........................................................................24

7. Special Function & KIT...............................................................................................36

Part 3 Control logic ....................................................................................................................39

1. Compressor.................................................................................................................40

2. Step(frequency) control..............................................................................................42

3. Reversing valve operaton ..........................................................................................43

4. Discharge pipe control ...............................................................................................44

5. Input Current Control..................................................................................................45

6. Outdoor Fan Control...................................................................................................46

7. Defrost Control............................................................................................................47

8. LEV Control .................................................................................................................48

9. Oil restoration operation ............................................................................................50

10. Compressor warm-up control logic ........................................................................50

11. Heat sink control.......................................................................................................51

Part 4 Test Run..........................................................................................................................52

1. Check before Test Run ..............................................................................................53

2. Test Run Flow chart ...................................................................................................54

3. Test Runing..................................................................................................................55

Part 5 Trouble Shooting Guide ...............................................................................................58

1. Self-diagnosis Function ......................................................................................59

2. Pump Down ..........................................................................................................63

3. Evacuation............................................................................................................64

4. Gas Charging .......................................................................................................65

5. Cycle Part .............................................................................................................66

6. Electronic Parts....................................................................................................67

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