LG Electronics LA090HPO, LA120CPI, LA120CPO, LA120HPI, LA120HPO

P/No.: 3828A20926C

December, 2006

Printed in Korea

Contents

Main LG Room Air Conditioner SERVICE MANUAL LG Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions Installation Operation Page Installation Operation Disuse Dimensions NOTICE Indoor Unit Symbols Used in this Manual 10 Room Air Conditioner Outdoor Unit Service Manual 11 Product Specifications AS-H121F2G0(LA120HP) AS-H091F2G0(LA090HP) AS-H121F2G0(LA121HNP) Product Specifications Models AS-C091F2G0(LA091CNP) AS-C091F2G0(LA090CP) AS-C121F2G0(LA121CNP) Installation Installation Parts Installation Tools Read carefully, and then follow step by step. Installation Map NOTICE Confirm The Refrigerant Service Manual 15 Indoor unit 19.6"(50cm) Select the best Location More than 7.9"(20cm) More than 19.6"(50cm) More than 4.9ft(1.5m) Rooftop Installations 16 Room Air Conditioner Piping Length and Elevation Preparing Work for Installation Fixing Indoor Unit INSTALLATION GU Drill a Hole in the Wall Service Manual 19 Flaring work and connection of piping Flaring Work Cutting the pipes and the cable. Removing burrs Putting nut on Connecting the Piping Service Manual 21 Connecting the piping with the indoor unit and drain hose with drain pipe Wrap the insulation material around the connecting portion. Page Connection of Piping -Outdoor Outdoor unit 24 Room Air Conditioner Connecting the cable between indoor unit and outdoor unit Connecting the Cables NOTICE Service Manual 25 Connection method of the connecting cable(Example) How to connect wiring to the terminals CAUTION Service Manual 27 Checking the drainage and forming the pipings Checking the drainage and forming the pipings Checking the Drainage To check the drainage. Drain piping Forming the Piping AIR PURGING Air Purging 30 Room Air Conditioner Air purgingd Soap water method Evacuation Finishing the job Service Manual 31 Charging Example: Important: Confirm the refrigerant R-410A. Use manifold gauge and hose for R-410A. Panel Front Assembly Service Manual 33 Test running TEST RUNNING Test Running Prepare remote controller Settlement of outdoor unit Evaluation of the performance Page How to replace picture & photograph Service Manual 35 How to replace picture & photograph 1. Turn off power and then open 3. Push and close the top part of Operation Functions Indoor Unit Service Manual 37 Operation The function of main control 3. Cooling Operation Mode < Cooling Mode > < Heating Mode > 1. Time delay Safety Control 38 Room Air Conditioner Operation . Auto Operation (Electronic control mode) Service Manual 39 Operation 5. Healthy Dehumidification 40 Room Air Conditioner Operation 6. Heating Operation Mode(only Heating Model) Service Manual 41 Operation 7. Cooling or Heating Mode with Sleep Mode Auto Control 9. Auto restart Service Manual 43 Operation Display Function Self-diagnosis Function Signal Receptor Operation Indication Lamps 44 Room Air Conditioner Remote Control Operations Disassembly Indoor Unit 46 Room Air Conditioner Disassembly Service Manual 47 Schematic Diagram Schematic Diagram Heat Pump/Cooling Only Series(Indoor Unit) Page Page Page Page Page Page Troubleshooting Guide Refrigeration Cycle Diagram (2) Cooling & Heating Models INDOOR UNIT OUTDOOR UNIT (1) Cooling Only Models Piping Length and Elevation Pumping Down 3-way Valve Service Manual 57 Troubleshooting Guide 1) Re-air purging Procedure 58 Room Air Conditioner Troubleshooting Guide 2) Balance refrigerant of the 3-way valve Procedure Service Manual 59 Troubleshooting Guide 2. Evacuation Procedure 3. Gas Charging CAUTION Service Manual 61 Troubleshooting Guide (According to Indoor & Outdoor Temperature) Additional gas charging Operating Suction Pressure (For R410A) 62 Room Air Conditioner Troubleshooting Guide Cycle Parts Trouble analysis NOTICE Service Manual 63 Troubleshooting Guide Electronic Parts (9k model) Product does not operate at all. (* Refer to Electronic Control Device drawing and Schematic diagram.) The product is not operate with the remote controller. Compressor/Outdoor Fan are unable to drive. When indoor Fan does not operate. When Vertical Louver does not operate. When a comunication error occurs. Service Manual 69 Troubleshooting Guide The phenomena in case of connecting error INDOOR UNIT 70 Room Air Conditioner Troubleshooting Guide OUTDOOR UNIT Voltage of Connectors according to Indoor Fan Speed 72 Room Air Conditioner Exploded View Exploded View Indoor Unit Service Manual 73 Exploded View 2. Outdoor Unit 74 Room Air Conditioner Replacement Parts List Replacement Parts List Parts List(Indoor) Service Manual 75 Replacement Parts List Parts List(Outdoor)

LG Electronics - page 76

Models: LA090HPO LA120CPI LA120CPO LA120HPI LA120HPO