Related Manuals for LG LA090CP
Summary of Contents for LG LA090CP
- Page 1 LG Room Air Conditioner SERVICE MANUAL MODELS: LA090CP LA120CP CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.
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Page 2: Table Of Contents
Air Conditioner Service Manual TABLE OF CONTENTS LG Model Name ...............................3 Safety Precautions............................4 Dimensions ..............................8 Symbols used in this Manual........................8 Indoor Unit..............................8 Outdoor Unit...............................9 Installation ..............................10 Select the Best Location .........................10 Piping Length and Elevation........................10 Preparing Work for Installation .........................11 Fixing the Indoor Unit ..........................12... -
Page 3: Lg Model Name
Nano Plasma F+(A/changeove)+A/clean+4way+Low A+PTC Negative ION+A/Clean (Nano)Plasma+Negative ION+A/Clean 4way+(Nano)Plasma F+Negative ION+Healthy dehumidification+A/Clean Nano Plasma F+4Way+(A/changeove)+A/clean+Oxy generator 4way+(Nano)Plasma F+Negative ION+Healthy dehumidification+A/Clean+Oxy generator Dry Contact Wired Remocon Serial No. LG Model Development Serial No. * ARTCOOL COLOR Mirror Walnut White Gogh Blue Sisley Wood... -
Page 4: Safety Precautions
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. This symbol indicates the possibility of death or serious injury. This symbol indicates the possibility of injury or damage to properties only. - Page 5 Safety Precautions Ensure that an installation Do not disassemble or repair Do not install the product at a frame of the outdoor unit is the product randomly. place that ther is concern of not damaged due to use for a falling down.
- Page 6 Safety Precautions Keep the flames away. Take the power plug out if neces- Do not use the power cord sary, holding the head of the plug near the heating tools. and do not touch it with wet hands. • Otherwise, it may cause a fire. •...
- Page 7 Safety Precautions Installation Install the drain hose to Install the product so that the Always inspect gas leakage ensure that drain can be noise or hot wind from the after the installation and repair securely done. outdoor unit may not cause of product.
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Page 8: Dimensions
Dimensions Dimensions Symbols used in this Manual This symbol alerts you to the risk of electric shock. This symbol alerts you to hazards that may cause harm to the air conditioner. This symbol indicates special notes. NOTICE Indoor Unit Hanger Hole Fix Hole Pipe Hole Model... - Page 9 Dimensions Gas side (3-way valve) Liquid side (2-way valve) MODEL 9K, 12K Models unit Service Manual 9...
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Page 10: Outdoor Unit
Installation Installation Selection of the Best Location More than 60cm Indoor unit More than 10cm More than 10cm • Do not have any heat or steam near the unit. • Select a place where there are no obstacles in front of the unit. More More than 70cm •... -
Page 11: Preparing Work For Installation
Installation Preparing Work for Installation Open front panel 1. Push the front panel backward and lift it up to remove the two screws. 2. As soon as you lift the both lower parts of panel front, you can hear the sound from panel front. At this moment panel front is separated 3. -
Page 12: Fixing The Indoor Unit
Installation Fixing the Indoor Unit 1. Attach an Installation guide map on the 6. Look at suited horizon by horizontal desired surface. meter on the horizontal setting line, and fix lightly the map by adhesive tape. INSTALLATION GUIDE MAP Horizontality T I O 2. -
Page 13: Flaring Work
Installation Flaring Work Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure. Cutting the pipes and the cable. 1. Use the piping kit accessory or the pipes purchased Copper locally. -
Page 14: Connecting The Pipings
Installation Check Smooth all round 1. Compare the flared work with the figure by. Inside is shiny without scratches 2. If a flared section is defective, cut it off and do flaring = Improper flaring = work again. Inclined Surface Cracked Uneven damaged thickness... - Page 15 Installation Connecting the pipings with the indoor unit and drain hose with drain pipe 1. Align the center of the pipings and sufficiently tighten the flare nut by hand. Indoor unit tubing Flare nut Pipes 2. Tighten the flare nut with a wrench. Outside diameter Torque Open-end wrench (fixed)
- Page 16 Installation Outdoor Align the center of the pipings and sufficiently tighten the flare nut by hand. Finally, tighten the flare nut with torque wrench until the wrench clicks. Outdoor unit • When tightening the flare nut with torque wrench, Gas side piping (Bigger diameter) ensure the direction for tightening follows the arrow on the wrench.
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Page 17: Connecting The Cables To The Indoor Unit
Installation Connecting the Cables to the Indoor Unit. • Connect the cables to the indoor unit by connecting the wires to the terminals on the control board dividually according to the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the terminal No. -
Page 18: Connecting The Cables To The Outdoor Unit
Installation Connecting the Cables to the Outdoor Unit 1. Remove the control cover from the unit by loos- Outdoor Unit ening the screw. Connect the wires to the terminals on the control Terminal block board individually. 2. Secure the cable onto the control board with the Over 5mm cord clamp. -
Page 19: Checking The Drainage
Installation Checking the Drainage Forming the Piping 1. Checking the drainage. 1. Form the piping by wrapping the connecting portion of the indoor unit with insulation materi- • Pour a glass of water on the evaporator. al and secure it with two kinds of vinyl tapes. •... -
Page 20: Air Purging
Installation Air Purging Air and moisture remaining in the refrigerant system • Do a leak test of all joints of the tubing(both indoor have undesirable effects as indicated below. and outdoor) and both gas and liquid side service valves. • Pressure in the system rises. Bubbles indicate a leak. - Page 21 Installation Soap water method Gas side (1) Remove the caps from the 2-way and 3-way valves. (2) Remove the service-port cap from the 3-way valve. (3) To open the 2-way valve turn the valve stem coun- Liquid side terclockwise approximately 90°, wait for about 2~3 3-way valve 3-way valve sec, and close it.
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Page 22: Front Panel Assembly
Installation Front Panel Assembly 1. First, Check the side cover assembly exactly, and fix the power cord in the bottom groove of cover side left. 2. Assemble connecting lead wire with controller, fix the upper part of the front panel, and match the lower part of the front panel. -
Page 23: Test Running
Test Running Intake temperature 1. Check that all tubing and wiring have been properly Discharge air connected. 2. Check that the gas and liquid side service valves are fully open. Prepare remote controller 1. Remove the battery cover by pulling it according to the Discharge arrow direction. -
Page 24: Operation
Operation Operation Function of Controls DISPLAY 1) C/O Model (high quality LCD remote controller supplied) Operation Indicator • On while in appliance operation, off while in appliance pause Timer Indicator • On while in timer mode (on/off) and in sleep timer mode, off when timer mode is completed or canceled. Comp. -
Page 25: Display Function
Operation Display Function 1. Heating Model 2. Cooling Model Operation Indicator Operation Indicator • Cooling, Soft Dry, Fan, Heating • Cooling, Soft Dry, Fan Sleep Timer Indicator Sleep Timer Indicator • Sleep Mode • Sleep Mode Timer Indicator Timer Indicator •... -
Page 26: Remote Control Operations
Operation Remote Control Operations The controls will look like the following. 1. START/STOP BUTTON Operation starts when this button is pressed and Controls stops when the button is pressed again. 2. OPERATION MODE SELECTION BUTTON Used to select the operation mode. 3. -
Page 27: Disassembly
Disassembly Disassembly Indoor Unit WARNING: Disconnect the unit from power supply before making any checks. Be sure the power switch is set to "OFF" 1. To remove the Grille from the Chassis. - Pull the grille bottom, the remove 2 securing screws. - Lift the both lower parts of panel front. - Page 28 Disassembly 3. To remove the Evaporator. - Remove 4 screws securing the evaporator. - Pull the evaporator out from the chassis carefully. 4. Before removing the Turbo Fan. - Remove the securing screws from the chassis. Air Guide Top Cover - Pull the pipe cover, top cover and the air guide.
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Page 29: Troubleshooting Guide
Troubleshooting Guide Troubleshooting Guide Refrigeration Cycle Diagram • Cooling Only Models INDOOR UNIT OUTDOOR UNIT LIQUID SIDE CAPILLARY TUBE HEAT EXCHANGER HEAT (EVAPORATOR) EXCHANGER (CONDENSER) COMPRESSOR GAS SIDE Pipe size(Diameter:ø) Piping length Elevation MODEL Liquid Rated Rated 9K, 12K 1/2" 1/4"... -
Page 30: 2-Way, 3-Way Valve
Troubleshooting Guide 2-way, 3-way Valve 2-way Valve (Liquid Side) 3-way Valve (Gas Side) Valve cap Hexagonal wrench (4mm) Open position Flare nut Flare nut Closed position Open position Closed position piping piping Service Service connection connection port cap port To outdoor unit To outdoor unit Works Shaft position... - Page 31 Troubleshooting Guide 1. Air purging Required tools : hexagonal wrench, adjustable correctly and there gas leaks, a gas cylinder and the wrench, torque wrenches, wrench to charge set will be needed. hold the joints, and gas leak detec- tor. The air in the indoor unit and in the piping must be purged.
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Page 32: Pumping Down
Troubleshooting Guide Troubleshooting Guide 2. Pumping down Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Closed 3-Way valve CLOSE CLOSE Purge the air • Procedure (6) Operate the air conditioner at the cooling (1) Confirm that both the 2-way and 3-way valves cycle and stop it when the gauge indicates are set to the open position. - Page 33 Troubleshooting Guide 1) Re-air purging (Re-installation) Liquid side Indoor unit Closed Outdoor unit 2-Way valve Gas side Closed 3-Way valve Gas cylinder OPEN CLOSE • Procedure (6) Disconnect the charge set and the gas cylin- (1) Confirm that both the 2-way valve and the 3- der, and set the 2-way and 3-way valves to the way valve are set to the closed position.
- Page 34 Troubleshooting Guide Troubleshooting Guide 2) Balance refrigerant of the 2-way, 3-way valves (Gas leakage) Liquid side Indoor unit Outdoor unit 2-Way valve Open Gas side 3-Way valve Open OPEN CLOSE • Procedure (3) Open the valve (Lo side) on the charge set and discharge the refrigerant until the gauge (1) Confirm that both the 2-way and 3-way valves indicates 0 kg/cm...
- Page 35 Troubleshooting Guide 3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 2-Way valve Open Gas side 3-Way valve Open Vacuum pump OPEN CLOSE • Procedure (4) Disconnect the charge hose from the vacuum pump. (1) Connect the vacuum pump to the charge set’s –...
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Page 36: Gas Charging
Troubleshooting Guide Troubleshooting Guide 4. Gas Charging (After Evacuation) Liquid side Indoor unit Open Outdoor unit 2-Way valve Gas side Open 3-Way valve Check valve Charging cylinder OPEN CLOSE • Procedure (1) Connect the charge hose to the charging This is different from previous procedures. cylinder. -
Page 37: Cycle Parts
Troubleshooting Guide Cycle Parts 1. Trouble analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. difference :approx. 0°F All amount of refrigerant leaked out. Current :less than 80% of Check refrigeration cycle. rated current Temp. Difference Temp. -
Page 38: Electronic Parts
Troubleshooting Guide Electronic Parts 2. Product does not operate at all. (* Refer to Electronic Control Device drawing and Schematic diagram.) Turn off Main Power (After 10 seconds) Turn on Main Power Does "beeping" sound is made from the Indoor Unit? Primarily, the operating condition of Micom is OK. - Page 39 Troubleshooting Guide 3. The product is not operate with the remote controller. Turn on Main Power While the compressor has been stopped, the compressor does not operate owing to the delaying function for 3 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed. At this point the wind speed is not controlled by the remote controller.
- Page 40 Troubleshooting Guide 4. Compressor/Outdoor Fan are unable to drive. Turn on Main Power Operate "Cooling Mode( )" by setting the desired temperature of the remote controller is less than one of the indoor temperature by 2°F at least. When in Fan Mode, Compressor/Outdoor Fan is stopped. Check the sensor for indoor temperature is attached as close as to be effected by the temperature of Heat Exchanger(EVA).
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Page 41: When Indoor Fan Does Not Operate
Troubleshooting Guide 5. When Indoor Fan does not operate. Does the voltage of each terminals of CN-MOTOR CONNECTOR in Indoor unit corresponds to values in the Table of page 51? Does the voltage of terminal of CN-DC/DC CONNECTOR in Check connecting condition of the CN-MOTOR CON- Indoor unit corresponds to the values in the table of page 51? NECTOR Do the voltage of terminal of... - Page 42 Troubleshooting Guide 6. When Vertical Louver does not operate. • Confirm that the Vertical Louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the Vertical Louver with hands Normal • Check the connecting condition of CN-U/D, CN-L/R Connector •...
- Page 43 Troubleshooting Guide 7. When a comunication error occurs. • The operation indicator of Indoor unit blinks five times. • The red indicator of Outdoor unit blinks five times. Check the connecting wires between Indoor and Outdoor unit for the connecting error and the contacting condition. Check the installation condition of outdoor unit.
- Page 44 Troubleshooting Guide 8. The phenomena in case of connecting error INDOOR UNIT Connector Type Phenomena Condition CN-DC/DC Open and connecting error • The same as the phenomenon of Outdoor Unit. Blue Black Brown • The indoor fan does not operate. CN-MOTOR Open •...
- Page 45 Troubleshooting Guide OUTDOOR UNIT Connector Type Phenomena Condition • All functions stop. • The operation with the remote controller, forced and OPEN test one do not operate. CN-POWER Connecting reversely • PWB pattern is damaged when applying the power. • All functions stop or the compressor does not operate. OPEN •...
- Page 46 Troubleshooting Guide 9. Voltage of Connectors according to Indoor Fan Speed 46 Room Air Conditioner...
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Page 47: Schematic Diagram
Schematic Diagram Schematic Diagram Schematic Diagram Electric Control Device Electric Control Device Indoor Unit AVdd1 AVss Service Manual 47... - Page 48 Schematic Diagram Outdoor Unit 48 Room Air Conditioner...
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Page 49: Wiring Diagram
Schematic Diagram Wiring Diagram Indoor Unit 9K, 12K (Cooling Only Models, Cooling & Heating Models) Outdoor Unit ( 9K, 12K) MAIN P.C.B T/B 1 MOTOR FUSE 3.15A RY-COMP CN-POWER CN-DC/DC RD BR BK BL FUSE 2.5A ( N ) ( L ) TERMINAL BLOCK O.L.P... -
Page 50: Components Location
Schematic Diagram Electric Control Device Components Location MAIN PWB ASSY(Indoor Unit) • TOP VIEW • BOTTOM VIEW • PWB ASSY SVC PART LIST OPTIONAL FUNCTION MODEL P/No. OR1H OR2H OR3H OR4H OR5H OR6H 12K Cooling Model 6871A20387G OPEN OPEN OPEN OPEN OPEN 9K Cooling Model... - Page 51 Schematic Diagram MAIN PWB ASSY(Outdoor Unit) • PWB ASSY SVC PART LIST OPTIONAL FUNCTION MODEL P/No. OR4H OR5H OR6H OR7H OR 8H FUSE RY-FAN CN-TH HEATER 4WAY 4WAY 12K Cooling Model 6871A10036S 125V 3.15A 9K Cooling Model 6871A10036R 5.1K 56K OPEN Service Manual 51...
- Page 52 Schematic Diagram DISPLAY PWB ASSEMBLY – 6871A20462 TOP VIEW BOTTOM VIEW SUB P.W.B ASSEMBLY CN-D4 PWB ASM:6871A20363 CN-D3 PWB:6870A90126A CN-D2 CN-D1 CN-CON(WH) CN-12V(WH) CN-D5 CN-SW(BL) CN-D7 CN-D6 CN-D8 52 Room Air Conditioner...
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Page 53: Product Specifications
Product Specifications Product Specifications Items Unit LA090CP LA120CP Power Supply ø, V, Hz 1, 115V, 60 1, 115, 60 Cooling Capacity BTU/h 9,000 12,000 Input 1,290 Running Current 11.7 COMP. Locked Rotor AMP. E.E.R BTU/hW Air Circulation /min(cfm) 7.1(250) 8.8(330) -
Page 54: Exploded View
Exploded View Exploded View Indoor Unit 54 Room Air Conditioner... -
Page 55: Outdoor Unit
Exploded View Outdoor unit Service Manual 55... -
Page 56: Replacement Parts List
Replacement Parts List Replacement Parts List Indoor Unit PART No. LOCATION DESCRIPTION REMARKS LA090CP LA120CP 131410 CHASSIS ASSEMBLY 3141A20030B 3141A20030B 135312 GRILLE ASSEMBLY,FRONT(INDOOR) 3531A20277V 3531A20277V 135314 GRILLE ASSEMBLY,INLET 3531A20278A 3531A20278A 135500-1 COVER 3550A20123C 3550A20123C 135500-2 COVER 3550A20124B 3550A20124B 135500-3 COVER... -
Page 57: Outdoor
Replacement Parts List Outdoor Unit PART No. LOCATION DESCRIPTION REMARKS LA090CP LA120CP 261704 TRANSFORMER,POWER 6171AQ3198G 6171AQ3198G 430410 BASE ASSEMBLY,OUTDOOR 3041A20008J 3041A20008J 435301 GRILLE,DISCHARGE 3530A20006G 3530A20006G 435511 COVER ASSY,CONTROL(OUTDOOR) 3551AR7184R 3551AR7184R 437210 PANEL ASSEMBLY,FRONT(OUTDOOR) 3721A20027T 3721A20027T 437212 PANEL ASSEMBLY,REAR(OUTDOOR) 3721A20026K 3721A20026K... - Page 58 P/No.: 3828A20135Z Printed in Korea...