3
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
TABLE OF CONTENTS
Safety Precautions ............................................................................. 4-7
Nomenclature ......................................................................................... 8
Wiring Diagrams ............................................................................... 9-16
Refrigerant Flow Diagrams ............................................................ 17-42
Outdoor Unit Functions ................................................................. 43-87
Basic Control ................................................................................ 43-44
Normal Operation/Compressor Control ......................................... 43
Master-Slave EEVs/Fan Motor Control ......................................... 44
Special Control ............................................................................. 45-47
Oil Return Control .......................................................................... 45
Defrost Control / Partial Defrost Control ........................................ 46
Stop Operation / Oil Equalizing ..................................................... 47
Protection Control ......................................................................... 48-49
Pressure Protection Control .......................................................... 48
Discharge Temperature/Inverter Protection ................................... 49
Other Controls .............................................................................. 50-53
Initial Setup ............................................................................... 50-53
Quick Control ................................................................................. 53
Setting Optional Modes ................................................................ 54-87
Heat Recovery Units ....................................................................... 88-95
Parts Functions .................................................................................. 88
Dimensional Diagrams ................................................................. 89-91
Wiring Diagram .................................................................................. 92
Refrigerant Circuit Diagram ............................................................... 93
Functions ...................................................................................... 94-95
PCB Settings ................................................................................. 96-110
Outdoor Unit DIP Switch Settings ...................................................... 96
Heat Recovery Unit Settings ...................................................... 97-102
Indoor Unit Addressing ............................................................. 103-104
Pipe Detection Addressing ....................................................... 105-110
Troubleshooting Main Components ..........................................111-124
Test Run ...........................................................................................111
Main Component Errors ...................................................................112
Self Diagnostics Check .....................................................................113
Checking the Compressor ........................................................114-115
Checking the Outdoor Unit Fan Motor ..............................................115
Checking the Electronic Expansion Valves ................................116-118
Checking the Phase Bridge Diode ....................................................119
Checking the Inverter IPM / IGBT .................................................... 120
Checking the Fan IPM ..................................................................... 121
Checking the High / Low Pressure Sensors ................................... 122
Checking the Outdoor Fan .............................................................. 122
Checking the Valves ................................................................. 123-124
Error Codes ................................................................................. 125-216
Error Code General Information ...................................................... 125
Error Code Tables ..................................................................... 126-135
Error Codes .............................................................................. 136-208
Replacing the Inverter PCB Heat Sink ............................................ 209
Checking Input Voltage in Case of Power On ................................. 210
Checking Main PCB DC Voltage in Case of Power On ....................211
Checking Converter DC Link Voltage in Case of
Compressor Operating .................................................................. 212
Checking ODU to ODU Comm. (DC Voltage) in
Case of Power On ......................................................................... 213
Checking Inverter PCB in Case of Power Off .................................. 214
Power System Wiring Diagram ........................................................ 215
PCB Locations ................................................................................. 216
Parts ............................................................................................. 217-234
PCBs ........................................................................................ 217-225
PCBs - Expanded Internal View ............................................... 226-228
Expanded Frame View ............................................................. 229-234
