Table Of Contents - LG MULTI V ARUN072BTE4 Service Manual

Safety Precautions ................................................................................ 4
Nomenclature ......................................................................................... 8
Outdoor Unit Functions ................................................................... 9-40
Basic Controls ................................................................................ 9-10
Normal Operation / Compressor Control ......................................... 9
Master-Slave Unit EEVs ................................................................ 10
Special Controls ....................................................................... 11-13
Oil Return Control ...........................................................................11
Defrost Control / Partial Defrost Control ........................................ 12
Stop Operation .............................................................................. 13
Protection Controls ....................................................................... 14-16
Pressure Protection Control .......................................................... 14
Discharge Temperature Control / Inverter Protection Control
Phase Detection / Pressure Switch ............................................... 16
Other Controls .............................................................................. 17-40
Initial Setup ............................................................................... 17-19
Emergency Operation ............................................................... 20-21
Refrigerant Auto Charge ........................................................... 22-23
Initial Test Run (ITR) (Cooling) ...................................................... 25
Initial Test Run (ITR) (Heating) ................................................. 26-27
Fault Detection Diagnosis (FDD) Code ......................................... 27
Multi V ITR Result Report ........................................................ 28-29
Pump Down .............................................................................. 30-31
Pump Out ................................................................................. 32-35
Auto Back Up Function (Inverter Compressor) .............................. 36
Night Low Sound Function ............................................................ 37
Vacuum Mode / Static Pressure Compensation Mode .................. 38
Mode Control ................................................................................. 39
Cycle Data View ............................................................................ 40
Heat Recovery Units ....................................................................... 41-48
Parts Functions .................................................................................. 41
Dimensional Diagrams ................................................................. 42-44
Refrigerant Circuit Diagram ............................................................... 45
Wiring Diagram .................................................................................. 46
Functions ...................................................................................... 47-48
PCB Settings and Test Run ........................................................... 49-62
Heat Recovery Unit Settings ........................................................ 49-53
Indoor Unit Addressing ................................................................. 54-55
Indoor and Heat Recovery Unit Addressing Flow Chart .................... 56
Pipe Detection .............................................................................. 57-61
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TABLE OF CONTENTS

Troubleshooting ........................................................................... 63-149
Test Run ............................................................................................ 63
Troubleshooting Main Component Errors ..................................... 64-76
Checking the Compressor ................................................................. 66
Checking the Outdoor Unit Fan Motor ............................................... 67
Checking the Electronic Expansion Valves ................................... 68-70
Checking the Phase Bridge Diode ..................................................... 71
Checking the Inverter IPM / IGBT ...................................................... 72
Checking the Fan IPM ....................................................................... 73
Checking the High / Low Pressure Sensors ..................................... 74
Checking the Solenoid Valves ........................................................... 75
Four-Way Reverse Valve ................................................................... 75
Temperature Sensor .......................................................................... 76
Electrical Capacitor and Resistor for Voltage Distributor ................... 76
Error Code Tables ......................................................................... 77-83
Service Troubleshooting ............................................................. 84-149
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