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Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions............................................................................................................................3 Part 1 General Information .............................................................................................................10 Model Names .............................................................................................................................11 External Appearance .................................................................................................................12 Combination of Outdoor Units .................................................................................................14 Nomenclature .............................................................................................................................15 Outdoor Units Information ........................................................................................................16 Part 2 Outdoor Units ................................................................................................................19 Part 3 PCB Setting and Test Run ........................................................................................57 Part 4 Trouble shooting guide ............................................................................................. 69 - 2 - LGE Internal Use Only
Safety Precautions Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 3 - Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. ■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. WARNING CAUTION This symbol indicates the possibility of death or serious injury. This symbol indicates the possibility of injury or damage to properties only. ■ Meanings of symbols used in this manual are as shown below. ■ Installation Have all electric work done by a licensed electrician according to "Electric Facility Engineering Standard" and "Interior Wire Regulations" and the instructions given in this manual and always use a special circuit. • If the power source capacity is inadequate or electric work is performed improperly, electric shock or fire may result. Always ground the product. • There is risk of fire or electric shock. Be sure not to do. Be sure to follow the instruction. WARNING Ask the dealer or an authorized technician to install the air conditioner. • Improper installation by the user may result in water leakage, electric shock, or fire. Always intstall a dedicated circuit and breaker. • Improper wiring or installation may cause fire or electric shock. LGE Internal Use Only
Page 1: System Outdoor Unit R410A SERVICE M
Page 5 and 6: Ventilate before operating air cond
Page 7 and 8: Use power cables of sufficient curr
Page 9 and 10: Safely dispose of the packing mater
Page 11 and 12: 1. Model Names 1.1 Indoor Unit * AR
Page 13 and 14: 2.2 Outdoor Units 2.2.1 Cooling Onl
Page 15 and 16: 3. Combination of Outdoor Units 3.1
Page 17 and 18: 4. Nomenclature 4.1 Indoor Unit ARN
Page 19 and 20: Part 2 Outdoor Units Copyright ©20
Page 21 and 22: Function Copyright ©2007 LG Electr
Page 23 and 24: 1.3 Master and slave Unit's EEV con
Page 25 and 26: 2.1.2 Oil return control on heating
Page 27 and 28: 2.3 Stopping operation 2.3.1 Stoppi
Page 29 and 30: 3.2 Discharge temperature control
Page 31 and 32: 4. Other control 4.1 Initial setup
Page 33 and 34: 4.2 Emergency operation - If a comp
Page 35 and 36: ■ Sensor Check Error Code Display
Page 37 and 38: Liquid Pipe Gas Pipe Procedure 1. A
Page 39 and 40: CAUTION 1. Guaranteed Temperature r
Page 41 and 42: 4.7 Pump Out This function gathers
Page 43 and 44: 4.8 Auto Back Up Function_Inverter
Page 45 and 46: 4.10 Night Low Noise Function In co
Page 47 and 48: 4.11 Vacuum Mode This function is u
Page 49 and 50: Part 3 PCB Setting and Test Run Cop
Page 51 and 52: 2. How to cope with Test Run abnorm
Page 53 and 54:
■ Checking according to dip switc
Page 55 and 56:
Function Dry Contact Snow Forced De
Page 57 and 58:
Replacement procedure for Compresso
Page 59 and 60:
Part 4 Trouble shooting guide Copyr
Page 61 and 62:
Copyright ©2007 LG Electronics. In
Page 63 and 64:
2.2 Fan Motor Checking Item Symptom
Page 65 and 66:
• EEV Coil and body(Outdoor unit)
Page 67 and 68:
2.4 Phase Bridge Diode Checking Met
Page 69 and 70:
2.6 Fan IPM Checking Method 2.7 UW1
Page 71 and 72:
2.10 Other Copyright ©2007 LG Elec
Page 73 and 74:
Outdoor unit related error Display
Page 75 and 76:
Page 77 and 78:
Outdoor unit related error Copyrigh
Page 79 and 80:
Outdoor unit related error Copyrigh
Page 81 and 82:
Page 83 and 84:
Error No. 01 Indoor unit air sensor
Page 86 and 87:
Troubleshooting Guide float A:Point
Page 88 and 89:
Troubleshooting Guide Error No. 06
Page 90 and 91:
Page 92 and 93:
Troubleshooting Guide Error No. 21*
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
Troubleshooting Guide * Measuring r
Page 102 and 103:
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
Troubleshooting Guide Error No. Err
Page 110:
Page 113 and 114:
Error No. 52* Master 521 Slave1 522
Page 115 and 116:
Error No. Error Type Error Point Ma
Page 117 and 118:
Page 119:
Page 122 and 123:
Troubleshooting Guide Measuring inp
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Page 138 and 139:
Page 140:
P/NO : 3828A24006W OCT, 2007
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