LG LAN121CNM Service Manual
LG LAN121CNM Manual
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- LG LAN121CNM | Service Manual - Page 1
website http://www.lgservice.com LG LG Room Air Conditioner SERVICE MANUAL MODELS: LAN121CNM (ASNC121ERH0) LAU121CNM (ASUC121EUH0) LA121HPMI (ASNH121ERH0) LA121HPMO (ASUH121EUH0) LAN121HNM (ASNH121ERH0) LAU121HNM (ASUH121EUH0) LA121CPMI (ASNC121ERH0) LA121CPMO (ASUC121EUH0) CAUTION • BEFORE - LG LAN121CNM | Service Manual - Page 2
Service Manual TABLE OF CONTENTS Safety Precautions...3 Dimensions...9 Symbols Used in this Manual ...9 Indoor Unit...9 Outdoor Unit...10 Introduction ...11 Symbols Used In This Manual ...38 Disassembly ...39 Indoor Unit...39 Troubleshooting Guide ...42 Refrigeration Cycle Diagram ...42 2-way, 3-way - LG LAN121CNM | Service Manual - Page 3
. This symbol indicates the possibility of injury or damage to properties only. I Meanings of symbols used in this manual are as shown below. Be sure not to do. Be sure to follow the instruction. I Installation Do not use damaged power cords, plugs, or a loose socket. • There is risk of fire or - LG LAN121CNM | Service Manual - Page 4
sharp edges. For installation, always contact the dealer or an Authorized Service Center. • There is risk of fire, electric shock, explosion, cause personal injury. 8ft(2.4m) I Operation Use a dedicated outlet for this appliance. Grasp the plug to remove the cord from the outlet. Do not touch - LG LAN121CNM | Service Manual - Page 5
Safety Precautions Do not place a heater or other appliances near the power cable. • There is risk of fire, failure of the product, and shock, or product. When the product is soaked (flooded or submerged), contact an Authorized Service Center. • There is risk of electrical shock. Service Manual 5 - LG LAN121CNM | Service Manual - Page 6
Safety Precautions Ventilate the product from time Unplug the appliance before to time when operating it togeth- performing injury. I Installation Always check for gas(refrigerant) leakage after installation or repair of product. • Low refrigerant levels may cause product failure. Install the - LG LAN121CNM | Service Manual - Page 7
the outdoor unit could damage the neighborhoods. • It may cause a problem for your neighbors. Use two or more people to lift and works of art, etc. It is a consumer air conditioner, not a precision refrigeration system. • There is risk of damage or loss of property. Do not block Service Manual 7 - LG LAN121CNM | Service Manual - Page 8
Dimensions Always insert the filter securely. Clean the filter every two weeks or more often if necessary. • A dirty filter reduces the efficiency of the air conditioner and Do not drink the water drained from the unit. • It is not sanitary and could cause serious health issues. Use a firm stool - LG LAN121CNM | Service Manual - Page 9
Dimensions Dimensions Symbols Used in this Manual This symbol alerts you to the risk of electric shock. This symbol alerts you to hazards that could special notes. Indoor Unit H D W Installation plate Dimension W H D Model mm mm mm 12k Btu Series 915(36.0) 282(11.1) 165(6.5) Service Manual 9 - LG LAN121CNM | Service Manual - Page 10
Outdoor Unit 1. 12k W L2 D L1 L3 Dimensions H L4 MODEL DIM unit W mm(inch) H mm(inch) D mm(inch) L1 mm(inch) L2 mm(inch) L3 mm(inch) L4 mm(inch) L5 mm(inch) 10 Room Air Conditioner L5 Gas side (3-way valve) Liquid side (2-way valve) 12k 770(30.3) 540(21.3) 245(9.6) 287( - LG LAN121CNM | Service Manual - Page 11
Introduction Introduction Symbols Used In This Manual This symbol alerts you to the risk of electric shock. This symbol alerts you to hazards that may cause Receptor Air Intake Vents Connecting Wires Piping Drain Hose Air Outlet Vents Connecting Wires Piping Drain Hose Base Plate Service Manual 11 - LG LAN121CNM | Service Manual - Page 12
Installation Installation Read carefully, and then follow step by step. Installation Parts Installation plate Type "B" screw Type "A" screw and plastic anchor Remote Control Holder Installation Tools Figure Name Screw driver Electric Drill Measuring Tape, Knife Hole Core Drill Spanner Torque - LG LAN121CNM | Service Manual - Page 13
Vents Base Plate Gas side piping (Optional Parts) Liquid side piping (Optional Parts) Additional drain pipe Vinyl tape (Narrow) Drain Hose Connecting cable (Optional Parts) Service Manual 13 - LG LAN121CNM | Service Manual - Page 14
oil. 2) Absorption of moisture -Compressor's oil has the high absorption rate of moisture. 3) Composition - R-410A(R32:R125=50:50wt%). NOTE: Never mix with other refrigerants Example : Split type 12,000 Btu/h 120 100 100 93 89 84 80 76 60 40 20 0 R-410A R-22 100% 0% 70% 30% 50% 50 - LG LAN121CNM | Service Manual - Page 15
the outdoor unit is installed on roof structures or walls, this may result in excessive noise and vibration, and may be also classed as non serviceable installation. Service Manual 15 - LG LAN121CNM | Service Manual - Page 16
) 7.5(25) Indoor unit Outdoor unit A B Outdoor unit Indoor unit B A Max. length A m(ft) 15(49) 15(49) 15(49) 30(98) 15(49) 15(49) Additional Refrigerant g/m(oz/ft) 20(0.22) 20(0.22) 20(0.22) 20(0.22) 20(0.22) 20(0.22) Outdoor unit Oil trap A Indoor unit B In case more than 5m - LG LAN121CNM | Service Manual - Page 17
drill. Drill the piping hole at either the right or the left with the hole slightly slanted to the outdoor side. Indoor WALL Outdoor 5-7mm (0.2~0.3") Service Manual 17 - LG LAN121CNM | Service Manual - Page 18
Flaring Work Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure. Cut the pipes and the cable. 1. Use the piping kit accessory or the pipes purchased locally. 2. Measure the distance between the indoor and the outdoor unit. 3. Cut - LG LAN121CNM | Service Manual - Page 19
the hooks are properly seated on the installation plate by moving it left and right. 1 2 Connecting cable Drain pipe Indoor unit Installation plate 8cm Spacer Service Manual 19 - LG LAN121CNM | Service Manual - Page 20
Connecting the pipings to the indoor unit and drain hose to drain pipe. • Put a couple drops of refrigerant oil on the face of the flare before assembling taking care not to add any contaminants. • Align the center of the pipings and sufficiently tighten - LG LAN121CNM | Service Manual - Page 21
the pipings to the indoor unit and the drain hose to drain pipe. • Put a couple drops of refrigerant oil on the face of the flare before assembling taking care not to add any contaminants • Align the Indoor unit tubing Flare nut Pipings • Tighten the flare nut with a wrench. Service Manual 21 - LG LAN121CNM | Service Manual - Page 22
• Wrap the area which accommodates the rear piping housing section with vinyl tape. Connection pipe Vinyl tape (wide) Indoor unit piping Wrap with vinyl tape Connecting cable Pipe Vinyl tape(narrow) Reroute the pipings and the drain hose across the back of the chassis. Piping for passage - LG LAN121CNM | Service Manual - Page 23
Installation Information. For left piping. Follow the instruction below. Correct case • Press on the upper side of clamp and unfold the tubing to downward slowly. Incorrect case • Following bending type from right to left may cause damage to the tubing. Service Manual 23 - LG LAN121CNM | Service Manual - Page 24
drain outlets. Be sure the rubber the cap is securely fastened so that there is no leakage. Connection of Piping -Outdoor Put a couple drops of refrigerant oil on the face of the flare before assembling taking care not to add any contaminants. Align the center of the pipings and sufficiently tighten - LG LAN121CNM | Service Manual - Page 25
NOTICE Connector trade size for this unit is 1/2" for instructions on connecting depending on the wire type you are using. wire must be connected firmly. • No wire should be allowed to touch refrigerant tubing, the compressor or any moving parts. Power Supply Model Power source AWG Service Manual 25 - LG LAN121CNM | Service Manual - Page 26
the wiring as follows: 1) Never fail to have an individual power circuit specifically for the air conditioner. As for the method of wiring, be guided by the circuit diagram posted on the inside of control cover. 2) The screw which fasten the wiring in the casing of electrical fittings are liable - LG LAN121CNM | Service Manual - Page 27
not raise Accumulated drain water Air Water leakage Water leakage Waving Tip of drain hose dipped in water Water leakage Ditch Less than 50mm gap Service Manual 27 - LG LAN121CNM | Service Manual - Page 28
Forming The Piping Form the piping by wrapping the connecting portion of the indoor unit with insulation material and secure it with two kinds of vinyl tapes. • If you want to connect an additional drain hose, the end of the drain outlet should be routed above the ground. Secure the drain hose - LG LAN121CNM | Service Manual - Page 29
refrigerant system have undesirable effects as indicated below. • Pressure in the system rises. • Operating current rises. • Cooling(or heating) efficiency drops. • Moisture in the refrigerant refrigeration have service valves. the service soap gas side service valves this service port refrigerant - LG LAN121CNM | Service Manual - Page 30
the vacuum pump. 3-way valve (Close) 3-way valve (Open) Suction Line Evaporator Line Cap Hexagonal wrench Indoor unit Outdoor unit Finishing the job • With a service valve wrench, turn the valve stem of liquid side valve counter-clockwise to fully open the valve. • Turn the valve stem of gas side - LG LAN121CNM | Service Manual - Page 31
25) 7.5(25) Max. length A m(ft) 15(49) 15(49) 15(49) 30(98) 15(49) 15(49) Additional Refrigerant g/m(oz/ft) 20(0.22) 20(0.22) 20(0.22) 20(0.22) 20(0.22) 20(0.22) Example: A 30ft line set is 7.5m(25ft). Confirm the refrigerant R-410A. Use manifold gauge and hose for R-410A. Service Manual 31 - LG LAN121CNM | Service Manual - Page 32
for use. PUMP DOWN This is performed when the unit is to be relocated or the refrigerant circuit is serviced. Pump Down means collecting all refrigerant in the outdoor unit without loss of refrigerant. CAUTION: Be sure to perform Pump Down procedure with the unit cooling mode. Pump Down Procedure - LG LAN121CNM | Service Manual - Page 33
OFF while in compressor off. 2) H/P Model Operation Indicator • ON while in appliance operation, OFF while in appliance pause. • Flashing while in disconnection or short in Thermistor. (3 sec off 18°C ≤ Intake Air Temp - LG LAN121CNM | Service Manual - Page 34
Operation • While in compressor off, the indoor fan repeats low airflow speed and pause. • While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehu- midification operation and 4-min compressor off repeat. Compressor ON Temp. ➲ Setting Temp+0.5°C Compressor OFF - LG LAN121CNM | Service Manual - Page 35
I Jet Cool Mode Operation (C/O Model) • If the Jet Cool key is input at any operation mode while in appliance operation, the Jet Cool mode operates. • In the Jet Cool mode, the indoor fan is operated at super-high and then operated in order that the air outflow could reach further. Service Manual 35 - LG LAN121CNM | Service Manual - Page 36
turned on according to the condition of the room temperature. I Buzzer Sounding operation • When the appliance-operation key is input by the remote control, the short "beep-beep-" sounds. • When the appliance-pause key is input by the remote control, the long "beep-" sounds. 36 Room Air Conditioner - LG LAN121CNM | Service Manual - Page 37
) (once) 1 3sec 3sec 3sec Error contents SVC check point • Indoor room temperature • Indoor Thermistor thermistor open/short assembly check • Indoor pipe temperature thermistor open/short. Service Manual 37 - LG LAN121CNM | Service Manual - Page 38
Operation Remote Control Operations The controls will look like the following. Signal transmitter 5 1 6 3 4 2 10 CANCEL 7 9 11 ON OFF SET AUTO CLEAN 12 17 8 19 13 18 14 15 16 Flip-up door (opened) Operation Mode Cooling Operation Auto Operation Healthy Dehumidification - LG LAN121CNM | Service Manual - Page 39
it straight upward. 1. Before removing the control box, be sure to take out the wire screwed at the other end. Disassembly Front panel Earth Conductor Service Manual 39 - LG LAN121CNM | Service Manual - Page 40
Disassembly 2. To remove the Control Box. • Remove securing screws. • Pull the control box out from the chassis carefully. 3. To remove the Discharge Grille. • Unhook the discharge grille and pull the discharge grille out from the chassis carefully. Screw 4. To remove the Evaporator. • Remove 3 - LG LAN121CNM | Service Manual - Page 41
from the cross-flow fan. • Remove the left end of the cross-flow fan from the self-aligning bearing. Motor cover Bearing Cross-flow fan Service Manual 41 - LG LAN121CNM | Service Manual - Page 42
Troubleshooting Guide Troubleshooting Guide Refrigeration Cycle Diagram (1) Cooling Only Models INDOOR UNIT OUTDOOR UNIT LIQUID SIDE CAPILLARY TUBE HEAT EXCHANGE (EVAPORATOR) HEAT EXCHANGE (CONDENSER) GAS SIDE (2) Cooling & Heating Models INDOOR - LG LAN121CNM | Service Manual - Page 43
Troubleshooting Guide 3-way Valve (Gas Side) Flare nut To piping connection Hexagonal wrench (4mm) Open position Closed position To outdoor unit Valve cap Flare nut Open position Closed position Pin To piping connection Service Service ) Open (with charging cylinder) Service Manual 43 - LG LAN121CNM | Service Manual - Page 44
Troubleshooting Guide Pumping Down Indoor unit Liquid side Open 2-Way valve Outdoor Disconnect the charge set, and mount the 2-way and 3-way valve's stem nuts and the service port nut. - Use torque wrench to tighten the service port nut to a torque of 1.8 kg.m. - Be sure to check for gas leakage - LG LAN121CNM | Service Manual - Page 45
Balance Refrigerant of the 3-way Valve (Gas leakage) Troubleshooting Guide Indoor unit Liquid side 3-Way valve Open Outdoor unit Gas side 3-Way valve Open OPEN Lo CLOSE • Procedure (1) Confirm that both the 2-way and 3-way - LG LAN121CNM | Service Manual - Page 46
Troubleshooting Guide Evacuation (All amount of refrigerant leaked) Indoor unit Liquid side 3-Way valve Open Outdoor unit Gas side 3-Way valve Open Vacuum pump OPEN Lo CLOSE • Procedure (1) Connect the vacuum pump - LG LAN121CNM | Service Manual - Page 47
) Indoor unit Liquid side Open 3-Way valve Troubleshooting Guide Outdoor unit Charging cylinder Check valve Gas side Open larger amounts of liquid refrigerant while operating the air conditioner. (4) Immediately disconnect the charge hose from the 3-way valve's service port. - Stopping partway - LG LAN121CNM | Service Manual - Page 48
Troubleshooting Guide Additional gas charging (Gas leakage) • When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal oper- ating suction pressure. • Use the graph or the equation below to get operating suction pressure according to indoor and out- door - LG LAN121CNM | Service Manual - Page 49
Troubleshooting Guide Cycle Parts Trouble analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. difference : approx. °F(0°C) Current : less than 80% of rated current • All amount of refrigerant leaked out. Check refrigeration Service Manual 49 - LG LAN121CNM | Service Manual - Page 50
Troubleshooting Guide Electronic Parts Product does not operate at all. (* Refer to Electronic Control Device drawing and Schematic diagram.) Turn off Main Power (After 20 seconds) Turn - LG LAN121CNM | Service Manual - Page 51
Troubleshooting Guide The product is not operate with the remote controller. Turn on Main Power While the compressor has been stopped, - IR LED - Q1 - R16(2.2KΩ). Check point • Check the connecting circuit between PIN 43 R11L(1K) - C11L(680PF) - MICOM PIN • Check Receiver Ass'y Service Manual 51 - LG LAN121CNM | Service Manual - Page 52
Troubleshooting Guide Compressor/Outdoor Fan are unable to drive. Turn on Main Power COMP) for driving compressor. • When the power(About AC110V) is applied to the connecting wire terminal support transferred to compressor, PWB Ass'y is normal. • Check the circuit related to the relay(Outdoor unit - LG LAN121CNM | Service Manual - Page 53
Troubleshooting Guide When indoor Fan does not operate. Does the voltage of each terminals of CN-MOTOR CONNECTOR in Indoor unit corresponds to values Fan is to be stopped when Indoor pipe(coil) termperature is lower than 79°F. (At that times, Defrost indicator is turned on) Service Manual 53 - LG LAN121CNM | Service Manual - Page 54
Troubleshooting Guide When Vertical Louver does not operate. • Confirm 12 and 13 of IC01M - Between 1 , 2 , 3 , 4 and 5 of CN-UP/DOWN If there are no problems after above checks • Confirm the assembly conditions that are catching and interfering parts in the rotation radial of the Vertical Louver 54 - LG LAN121CNM | Service Manual - Page 55
unit blinks five times. • The red indicator of Outdoor unit blinks five times. Troubleshooting Guide Check the connecting wires between Indoor and Outdoor unit for the connecting error and the error will occur. Therefore, the power should be applied after connecting them. Service Manual 55 - LG LAN121CNM | Service Manual - Page 56
Troubleshooting Guide The phenomena in case of connecting error INDOOR UNIT Connector Type Condition Phenomena CN-DC/DC Open and connecting error • The same as the phenomenon - LG LAN121CNM | Service Manual - Page 57
the remote controller and opera- tion of product is impossible. • The RED indicator of the Outdoor unit blinks 5 times after 2 minutes with applying the power. Service Manual 57 - LG LAN121CNM | Service Manual - Page 58
Schematic Diagram Schematic Diagram Electric Control Device I Indoor 58 Room Air Conditioner - LG LAN121CNM | Service Manual - Page 59
I Outdoor (12k) Schematic Diagram Service Manual 59 - LG LAN121CNM | Service Manual - Page 60
Wiring Diagram I Indoor Unit Models: 12k 60 Room Air Conditioner - LG LAN121CNM | Service Manual - Page 61
Schematic Diagram I Outdoor Unit Models: 12k(C/O) Models: 12k(H/P) Service Manual 61 - LG LAN121CNM | Service Manual - Page 62
Components Location I Indoor MAIN P.W.B ASSEMBLY • TOP VIEW Schematic Diagram • BOTTOM VIEW 62 Room Air Conditioner - LG LAN121CNM | Service Manual - Page 63
Schematic Diagram I Outdoor(12k) • TOP VIEW • BOTTOM VIEW Service Manual 63 - LG LAN121CNM | Service Manual - Page 64
11 PWB: 6870A90720A CN_SUB ASSM: 6871A00087 CN_STEPPING MOTOR(F/G) CN_LIMIT2 CN_FORCE CN_RECEIVER_1 Schematic Diagram DISPLAY ASSEMBLY - 6871A00087B 11 1 11 CN_TH1_1 CN_TH1_2 - 6871A00088A ASSM: 6871A00088 R01L CN_RECEIVER - 6871A20259D RECEIVER PWB: 6870A90719A C01R < - LG LAN121CNM | Service Manual - Page 65
control) Self Diagnosis Timer Sleep Operation Healthy Dehumidification Mode Restart Delay minutes Refrigerant(R-410a) Charge g(oz) Power cord AWG#:P*mm2 Fuse of breaker .3(73.4) * Design and specifications subject to change without prior notice for product improvement. Service Manual 65 - LG LAN121CNM | Service Manual - Page 66
Operation(electronic control) Self Diagnosis Timer Sleep Operation Healthy Dehumidification Mode Restart Delay minutes Defrost Control Hot Start Refrigerant(R410A) Charge g(oz) Power cord AWG #: P*mm2 Fuse or breaker Capacity A Connecting Cable AWG #: P*mm2 Connecting Tube Liquid - LG LAN121CNM | Service Manual - Page 67
Exploded View Indoor Unit 152302 Exploded View 135316 159830 267110 342800 359011 131410 268711-4 268711-4 268711-4 146811 263230 733010 354210 147581 146811 146811 352150 35211B 135311 249951 135516 346810 266090 268711-2 263230 Service Manual 67 - LG LAN121CNM | Service Manual - Page 68
68 Room Air Conditioner 435301 437211 263230-2 554031 549610 546810 559010 649950 W0CZZ 263230-3 268711-2 447910 430410 437212 435511 552113 552102 552202 567502 554160 553000 550140 552203-2 552116 566000 552203-1 Outdoor Unit: 12k Btu/h Seriess Exploded View - LG LAN121CNM | Service Manual - Page 69
PCB ASSEMBLY, SUB PCB ASSEMBLY, SUB PCB ASSEMBLY, SUB PART No. LAN121CNM (ASNC121ERH0) LAN121HNM (ASNH121ERH0) REMARKS LA121CPMI (ASNC121ERH0) LA121HPMI (ASNH121ERH0) these parts may be changed depending upon the buyer's request. (GCSC WEBSITE http://biz.LGservice.com) Service Manual 69 - LG LAN121CNM | Service Manual - Page 70
ASSEMBLY OUTDOOR 4791A30002U 4791A30002U R TUBE ASSEMBLY, CONDENSER(OUT) 5211A24118B 5211A24118B R VALVE, SERVICE 5220A20005B 5220A20005B R VALVE, SERVICE 5220A20006A 5220A20006A R MOTOR ASSEMBLY, OUTDOOR 4681A20122B 4681A20122B R BRACKET ASSEMBLY, MOTOR(OUTDOOR) 4961A10015B - LG LAN121CNM | Service Manual - Page 71
P/No.: MFL31443001 Printed in Korea
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LG
Room Air Conditioner
SERVICE MANUAL
LG
MODELS: LAN121CNM (AS
N
C121ERH0)
LAU121CNM (ASUC121EUH0)
LA121HPMI (ASNH121ERH0)
LA121HPMO (ASUH121EUH0)
LAN121HNM (ASNH121ERH0)
LAU121HNM (ASUH121EUH0)
LA121CPMI (ASNC121ERH0)
LA121CPMO (ASUC121EUH0)
CAUTION
website http://www.lgservice.com
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.