LG L2-C362LL0 Service Manual
LG L2-C362LL0 Service Manual

LG L2-C362LL0 Service Manual

Multi type air conditioner

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LG
Multi Type Air Conditioner

SERVICE MANUAL

MODEL: L2-C362LL0
L3-C362LL0
L3-C482LL0
website http://www.lgservice.com
e-mail http://www.lgeservice.com/techsup.html
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
LG

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Summary of Contents for LG L2-C362LL0

  • Page 1: Service Manual

    Multi Type Air Conditioner SERVICE MANUAL MODEL: L2-C362LL0 L3-C362LL0 L3-C482LL0 CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.
  • Page 2: Table Of Contents

    Multi Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions............................3 Product Specifications ..........................7 Dimensions..............................10 Refrigeration Cycle Diagram........................14 Wiring Diagram............................16 Electronic Control Device.........................17 Schematic Diagram...........................20 Functions ..............................24 Operation Details ............................27 2-way, 3-way Valve ............................34 Cycle Troubleshooting Guide ........................38 Electronic Parts Troubleshooting Guide ....................39 Installation ..............................46 Operation ..............................59 Disassembly of the parts (Indoor unit) ....................61...
  • Page 3: Safety Precautions

    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. WARNING This symbol indicates the possibility of death or serious injury.
  • Page 4 Safety Precautions Do not modify or extend the Do not install, remove, or re- Be cautious when unpacking power cable. install the unit by yourself and installing the product. (customer). • There is risk of fire or electric shock. • There is risk of fire, electric shock, •...
  • Page 5 Safety Precautions Do not store or use flammable gas or com- If strange sounds, or smell or smoke comes bustibles near the product. from product. Turn the breaker off or discon- nect the power supply cable. • There is risk of fire or failure of product. •...
  • Page 6 Safety Precautions CAUTION Installation check for gas (refrigerant) Install the drain hose to Keep level even when leakage after installation or ensure that water is drained installing the product. repair of product. away properly. • Low refrigerant levels may cause fail- •...
  • Page 7: Product Specifications

    Product Specifications Product Specifications 1. L2-C362LL0 Operation A or B unit A + B unit Unit Item Cooling Capacity Btu/h(kcal/h) 17,800(4,486) 35,600(8,972) Moisture Removal 2.0 x 2 Power Source ø, V, Hz 1Ø, 220, 60HZ Indoor 13.1 Air Circulation /min...
  • Page 8 Product Specifications 2. L3-C362LL0 Operation A-Unit B or C-Unit A+B or C A+B+C Unit Item 12,000(3,024) 13,000(3,276) 25,000(6,300) 23,800(5,998) 35,800(9,022) Cooling Capacity Btu/h(kcal/h) Moisture Removal Power Source ø, V, Hz 1Ø, 220V, 60Hz Indoor 9.0 + 9.5 9 + 9 9.0 x 3 Air Circulation /min...
  • Page 9 Product Specifications 3. L3-C482LL0 Operation A-Unit B or C-Unit A+B or C A+B+C Unit Item 24,000(6,048) 16,000(4,032) 40,000(10,080) 24,000(6,048) 48,000(12,096) Cooling Capacity Btu/h(kcal/h) Moisture Removal Power Source ø, V, Hz 1Ø, 220V, 60Hz Indoor 14.5 14.5 + 9.0 8.2 + 8.2 14.5 + 8.2 + 8.2 Air Circulation /min Outdoor...
  • Page 10: Dimensions

    Dimensions Dimensions 1. Indoor Unit Tubing hole cover Installation plate Installation plate ( 9K, 10K, 12K, 18K, 24K ) ( 4.5K, 6K, 7K, 8K, 9K ) Left rear piping Right rear piping Left rear piping Right rear piping 80mm 50mm ø70mm ø70mm ( 9K, 10K, 12K, 18K, 24K )
  • Page 11 Dimensions 2. Outdoor Unit Model: L2-C362LL0 Gas side 3-Way valve Liquid side 2-Way valve MODEL L2-C362LL0 76.5 Service Manual 11...
  • Page 12 Dimensions L3-C362LL0 Gas side 3-way valve Liquid side 2-way valve MODEL L3-C362LL0 76.5 12 Multi Air Conditioner...
  • Page 13 Dimensions L3-C482LL0 1,225 Service Manual 13...
  • Page 14: Refrigeration Cycle Diagram

    Refrigeration Cycle Diagram Refrigeration Cycle Diagram 1. L2-C362LL0 LIQUID SIDE CAPILLARY TUBE 2-WAY VALVE HEAT HEAT EXCHANGER EXCHANGER (EVAPORATOR) (CONDENSER) A-UNIT B-UNIT COMPRESSOR GAS SIDE 3-WAY VALVE COMPRESSOR Pipe Size (Diameter : inch) Max. Max. piping length piping elevation Solenoid Valve...
  • Page 15: Indoor Unit

    Refrigeration Cycle Diagram 3. L3-C482LL0 Indoor Unit Outdoor Unit 2- WAY Heat Valve Exchanger 3- WAY A-Unit Valve Heat Exchanger Comp-A 3- WAY Valve Heat Exchanger Comp-B C-Unit B-Unit 2- WAY Valve Pipe Size Solenoid Valve Max. Max. (Diameter : inch) Indoor piping length piping elevation...
  • Page 16: Wiring Diagram

    Wiring Diagram Wiring Diagram Indoor Unit Model: L2-C362LL0 Model: L3-C362LL0, L3-C482LL0 FORCED FORCED MAIN PCB MAIN PCB OPERATION OPERATION AUTO AUTO RESTART RESTART TRIAC REMOTE REMOTE CONTROL CONTROL MOTOR MOTOR OPTION THERMISTOR THERMISTOR STEP SH-CAPA. SH-CAPA. MOTOR STEP MOTOR H.V.B...
  • Page 17: Electronic Control Device

    Electronic Control Device Electronic Control Device Indoor Unit • MAIN P.C.B ASM(L3-C362LL0, L3-C482LL0) • MAIN P.C.B ASM(L2-C362LL0) Service Manual 17...
  • Page 18 Electronic Control Device Outdoor Unit • MAIN P.C.B ASM(L3-C362LL0, L3-C482LL0) 18 Multi Air Conditioner...
  • Page 19 Electronic Control Device Display P.C.B ASM Service Manual 19...
  • Page 20: Schematic Diagram

    Schematic Diagram Schematic Diagram Indoor Unit • L3-C362LL0, L3-C482LL0 20 Multi Air Conditioner...
  • Page 21 Schematic Diagram • L2-C362LL0 Service Manual 21...
  • Page 22 Schematic Diagram Outdoor Unit • L3-C362LL0 22 Multi Air Conditioner...
  • Page 23 Schematic Diagram • L3-C482LL0 Service Manual 23...
  • Page 24: Functions

    Functions Functions Indoor Unit Operation ON/OFF by Remote controller Sensing the Room Temperature • Room temperature sensor. (THERMISTOR) Room temperature control • Maintains the room temperature in accordance with the Setting Temp. Starting Current Control • Indoor fan is delayed for 5 seconds at the starting. Time Delay Safety Control •...
  • Page 25 Functions Remote Controller Operation ON/OFF Operation Mode Selection Cooling Operation Mode.( Auto Operation Mode.( (Cooling (Heating Healthy Dehumidification Operation Mode.( Heating Operation Mode.( model only) model only) Fan Speed Selection (Low) (Med) (High) (CHAOS) Room, Temperature Display : (High:39°C Low:11°C) Temperature Setting HIGH TEMPERATURE...
  • Page 26 Display Function Display Function 1. Heating Model 2. Cooling Model Operation Indicator Operation Indicator • Cooling, Soft Dry, Fan • Cooling, Soft Dry, Fan, Heating Sleep Timer Indicator Sleep Timer Indicator • Sleep Mode • Sleep Mode Timer Indicator Timer Indicator •...
  • Page 27: Operation Details

    Operation Details Operation Details Main Unit Function 1) C/O Model Operation Indicator • On while in appliance operation, off while in appliance pause • Flashing while in disconnection or short in Thermistor (3 sec off / 0.5 sec on) Sleep Timer Indicator •...
  • Page 28 Operation Details • 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 dehumidifica- tion operation and 4-min compressor off repeat. Compressor ON Temp.
  • Page 29 Operation Details Fuzzy Operation (C/O Model) • According to the temperature set by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on. Compressor ON Temp Setting Temp + 0.5°C Compressor OFF Temp...
  • Page 30 Operation Details 2) Fuzzy Operation for Dehumidification • According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on.
  • Page 31: Sleep Timer Operation

    Operation Details Off-Timer Operation • When the set time is reached after the time is input by the remote control, the appliance stops operating. • The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached. •...
  • Page 32 Operation Details Auto Restarting Operation • When the power is restored after a sudden power failure while in appliance operation, the mode before the power failure is kept on the memory and the appliance automatically operates in the mode on the memory. •...
  • Page 33 Operation Details Remote Control Operation Mode • When the remote control is selected by the slide switch on the main unit, the appliance operates according to the input by the remote control. Protection of the evaporator pipe from frosting • If the indoor pipe temp is below 0°C in 7 min. after the compressor operates without any pause while in cool- ing cycle operation mode, the compressor and the outdoor fan are turned off in order to protect the indoor evaporator pipe from frosting.
  • Page 34: 2-Way, 3-Way Valve

    2-way, 3-way Valve 2-way, 3-way Valve 2-way Valve (Liguid Side) 3-way Valve (Gas Side) Valve cap Hexagonal wrench Open position (4mm) Closed position Flare nut Flare nut Open position Closed position piping piping Service Service connection connection port cap port To outdoor unit To outdoor unit Works...
  • Page 35 2-way, 3-way Valve (1) Pumping down Liquid side Indoor unit Outdoor unit Close 2-Way valve Gas side Open 3-Way valve manifold gauge Low-handle Hi- handle (CLOSE) (CLOSE) Procedure • 6. Operate the air conditioner at the cooling cycle 1. Confirm that both the gas side and liquid side and stop it when the gauge indicates 1kg/cm valves are set to the open position.
  • Page 36 2-way, 3-way Valve (2) Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit Close 2-Way valve Gas side Open 3-Way valve manifold gauge Vacuum pump Low- handle Hi- handle (OPEN) (CLOSE) • Procedure 7. Disconnect the charge hose from the vacuum 1.
  • Page 37 2-way, 3-way Valve (3) Gas Charging (After Evacuation) Liquid side Indoor unit Outdoor unit Close 2-Way valve Gas side Open 3-Way valve manifold gauge Charging cylinder Low-handle Hi- handle (OPEN) Check valve (CLOSE) • Procedure 1. Connect the gauge to the charging cylinder. 4.
  • Page 38: Cycle Troubleshooting Guide

    Cycle Troubleshooting Guide Cycle Troubleshooting Guide Trouble analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. difference : approx. 0°C All amount of refrigerant leaked out. Current : less than 80% of Check refrigeration cycle. rated current Temp.
  • Page 39: Electronic Parts Troubleshooting Guide

    Electronic Parts Troubleshooting Guide Electronic Parts Troubleshooting Guide 1. The Outdoor Unit 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 40 Electronic Parts Troubleshooting Guide 2. 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 41 Electronic Parts Troubleshooting Guide 3. When cooling does not operate 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 1°C at least. When in Air Circulation 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).
  • Page 42 Electronic Parts Troubleshooting Guide 4. When indoor Fan does not operate.(or "ON/OFF" led of display blinks 8 times) Turn off Main power Check the connection of CN-FAN or CN-MOTOR Check the Fan Motor Check the Fuse(AC250V/T2A) Check the related circuit of indoor Fan Motor. •...
  • Page 43 Electronic Parts Troubleshooting Guide 5. 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 •...
  • Page 44 Electronic Parts Troubleshooting Guide 6. When Heating does not operate Turn ON Main Power Operate “Heating Mode( )” by setting the desired temperature of the remote control is higher than one of the indoor temperature by 2°C at least. In heating Mode, the indoor fan operates in case the pipe temperature is higher than 28°C.
  • Page 45 Electronic Parts Troubleshooting Guide 7. Outdoor unit does not operate at all. Check Outdoor Unit PCB Board Operation Check in Outdoor Content Remedy Items • Power Transformer - About AC220V/240V ± 10% - Check the power voltage (Outdoor unit) • Replace Trans - About AC14 ±...
  • Page 46: Installation

    Installation Installation (1) Installation of Indoor, Outdoor unit 1) Selection of the best location Front 1. Indoor unit There should not be any heat source or steam • Left near the unit. • There should not be any obstacles to prevent Rear left the air circulation.
  • Page 47 Installation 2) Indoor Unit Installation The mounting wall should be strong and solid enough to protect it from the vibration. Installation Plate 1. Mount the installation plate on the wall with four Type "A" screws. (If mounting the unit on the concrete wall, consid- er using anchor bolts.) marking-off line Type "A"...
  • Page 48 Installation (2) Piping and Drainage of Indoor Unit 1) Preparation of pipings Pipe cutter 1. Cut the pipes and the cable. • Use the accessory piping kit or the pipes pur- chased locally. Slanted Rough • Measure the distance between the indoor and the outdoor unit.
  • Page 49 Installation 2) Connection of Pipings Installation plate 1. Remove the installation plate • Pull the two '∆' marked portion of bottom of the chassis and pull the installation plate out of chas- sis. Pull 2. Route the drain hose and the indoor tubing. Pull For left rear piping 3.
  • Page 50 Installation 6. Indoor unit installation. • Hook the indoor unit onto the upper position of the installation plate. (Engage the two hooks of the rear top of the indoor unit with the upper Connecting edge of the installation plate.) cable Ensure the hooks are properly seated on the installation plate by moving it in left and right.
  • Page 51 Installation 9. Set the pipings and the connecting cable to the back of the chassis with the tubing holder. • Hook the edge of tubing holder to tap on chas- sis and push the bottom of tubing holder to be engaged in the bottom of chassis.
  • Page 52 Installation (3) Connecting Pipings and the cable to Outdoor unit 1) Connecting the pipings to the Outdoor unit 1. Align the center of the pipings and sufficiently tighten the flare nut with fingers. 2. Finally, tighten the flare nut with torque wrench until the wrench clicks.
  • Page 53 (Rubber insulation, type H05RN-F approved by HAR specifications (Rubber insulation, type H07RN-F or SAA). approved by HAR or SAA). CAPACITY NORMAL CROSS- NORMAL CROSS- (Btu/h) SECTION AREA Models SECTION AREA ~24K 2.5mm L2-C362LL0 1.5mm ~36K 3.5mm Others 0.75mm ~48K 5.5mm Service Manual 53...
  • Page 54: Connect The Cable To The Indoor Unit

    Installation CAUTION If a power plug is not to be used, provide a circuit breaker between power source and the unit as shown below. Main power source Circuit Breaker Conditioner Use a circuit breaker or time delay fuse. Connect the cable to the indoor unit 1.
  • Page 55 Installation (5) Form the piping (4) Checking the drainage 1. To remove the front panel from the indoor unit, 1. Form the piping by wrapping the connecting por- remove the front panel from the indoor unit cabinet. tion of the indoor unit with insulation material and Set the air direction louvers up-and-down to the posi- secure it with two kinds of vinyl tapes.
  • Page 56 Installation (6) Air Purging of the Pipings and indoor unit The air which contains moisture remaining in the is refrigeration cycle may cause a malfunction on the compressor. 1. Confirm that both the liquid side valve and the gas side valve are set to the closed position. 2.
  • Page 57 Installation (7) Maximum Length of Pipe and Freon Extra Charge Charge amount per 1m CONNECTION TYPE Capacity STANDARD Charge am't(g) (Btu/h) LENGTH(m) per 1m ~7000 ~9000 ~12000 ~18000 ~24000 B(Length) INDOOR UNIT A(Height) OUTDOOR UNIT C(Height) INDOOR UNIT D(Length) ** A, B mean indoor unit higher located than outdoor unit. C, D mean outdoor unit higher located than indoor unit.
  • Page 58 Installation (8) Test running 1) Connection of power supply 1. Connect the power supply cord to the inde- Battery Cover pendent power supply. 2. Prepare the remote control. • Insert two batteries provided. Remove the battery cover from the remote con- troller.
  • Page 59: Operation

    Operation Operation (1) Name and Function-Remote Control (Cooling Model) REMOTE CONTROL Remote Controller ON/OFF TIMER BUTTONS Used to set the time of starting and stopping operation. Signal transmitter. TIME SETTING BUTTONS Transmits the signals Used to adjust the time. to the room air conditioner. TIMER SET/CANCEL BUTTONS Signal transmitter Used to set the timer when the desired time is obtained...
  • Page 60: Remote Controller

    Operation (2) Name and Function-Remote Control (Heat Pump Models) Remote Controller ON/OFF TIMER BUTTONS Signal transmitter. Used to set the time of starting and stopping operation. Transmits the signals TIME SETTING BUTTONS to the room air conditioner. Used to adjust the time. Signal transmitter TIMER SET/CANCEL BUTTONS Used to set the timer when the desired time is obtained...
  • Page 61: Disassembly Of The Parts (Indoor Unit)

    Disassembly of the parts (Indoor unit) Disassembly of the parts (Indoor unit) Warning : Disconnect the unit from power supply before mak- ing any checks. Be sure the power switch is set to “OFF”. To remove the Grille from the Chassis. •...
  • Page 62 Disassembly of the parts (Indoor unit) 2. To remove the Control Box. • Remove securing screws. • Pull the control box out from the chassis care- fully. 3. To remove the Discharge Grille. • Pull the discharge grille out from the chassis carefully.
  • Page 63: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List Exploded View and Replacement Parts List 1. Indoor Unit • L3NC122LML0, L3NC122LRL0 Service Manual 63...
  • Page 64 Exploded View and Replacement Parts List • L3NC122LRL0 LOCATION NO. PART NO. DESCRIPTION REMARKS 131410 3141A20003A CHASSIS ASSY 135311 3531A10023A GRILLE ASSY, DISCHARGE(INDOOR) 135316 3531A20200F GRILLE ASSY, FRONT(INDOOR) 135314 3531A20201G GRILLE ASSY, INLET 146811 4681AR2727H MOTOR ASSEMBLY, STEP 152302 5230A20004E FILTER(MECH), A/C 152313 5231A30001C...
  • Page 65 Exploded View and Replacement Parts List • L3NC122LML0 LOCATION NO. PART NO. DESCRIPTION REMARKS 131410 3141A20003A CHASSIS ASSY 135311 3531A10023A GRILLE ASSY, DISCHARGE(INDOOR) 135316 3531A20200F GRILLE ASSY, FRONT(INDOOR) 135314 3531A20201G GRILLE ASSY, INLET 146811 4681AR2727H MOTOR ASSEMBLY, STEP 152302 5230A20004A FILTER(MECH), A/C 152313 5231A30001C...
  • Page 66 Exploded View and Replacement Parts List • L2NC182LML0, L3NC242LRL0 66 Multi Air Conditioner...
  • Page 67 Exploded View and Replacement Parts List • L2NC182LML0 LOCATION NO. PART NO. DESCRIPTION REMARKS 131410 3141A20002F CHASSIS ASSY 135311 3531A10008N GRILLE ASSY, DISCHARGE(INDOOR) 135316 3531A20202G GRILLE ASSY, FRONT 135314 3531A20203G GRILLE ASSEMBLY, INLET SUB 146811 4681AR2727H MOTOR ASSEMBLY, STEP 152302 5230A20001A FILTER(MECH), A/C 152313...
  • Page 68 Exploded View and Replacement Parts List • L3NC242LRL0 LOCATION NO. PART NO. DESCRIPTION REMARKS 131410 3141A20002F CHASSIS ASSY 135311 3531A10008H GRILLE ASSY,DISCHARGE(INDOOR) 135316 3531A20202G GRILLE ASSY,FRONT 135314 3531A20203G GRILLE ASSEMBLY,INLET SUB 146811 4681AR2727H MOTOR ASSEMBLY,STEP 152302 5230A20001A FILTER(MECH),A/C 152313 5231A30001A FILTER ASSY,DEODORIZER 159830 5983A10002N...
  • Page 69 Exploded View and Replacement Parts List 2. Outdoor Unit • L2UC362LL0 Service Manual 69...
  • Page 70 Exploded View and Replacement Parts List • L2UC362LL0 LOCATION NO. PART NO. DESCRIPTION REMARKS 137213-1 1A00202F PANEL ASSY,SIDE 137213-2 1A00204E PANEL ASSY,SIDE 430411 3041AP7177B BASE ASSY,WELD[OUTDOOR] 435301 3530A20007J GRILLE,DISCHARGE 435512 3H03266H COVER ASSEMBLY,TOP(OUTDOOR) 437210 1A00197C PANEL ASSY,FRONT SUB 437212 1A00208D GRILLE,REAR 447910 4791A30004G...
  • Page 71 Exploded View and Replacement Parts List • L3UC362LL0 Service Manual 71...
  • Page 72 Exploded View and Replacement Parts List • L3UC362LL0 LOCATION NO. PART NO. DESCRIPTION REMARKS 346810 4681A20008E MOTOR ASSEMBLY,AC 430411 3041AP2741Z BASE ASSY,OUTDOOR 435301 3530A20007J GRILLE,DISCHARGE 435512 3H03266H COVER ASSEMBLY,TOP(OUTDOOR) 437210 1A00197C PANEL ASSY,FRONT SUB 437212 1A00208D GRILLE,REAR 447910 4791A30004G BARRIER ASSY,OUTDOOR 550140-1 4022U-L005A ISOLATOR,COMP...
  • Page 73 Exploded View and Replacement Parts List • L3UC482LL0 Service Manual 73...
  • Page 74 Exploded View and Replacement Parts List • L3UC482LL0 LOCATION NO. PART NO. DESCRIPTION REMARKS 137213 3720AP1215E PANEL, SIDE 268711 6871A20501D PWB(PCB) ASSY, MAIN(OUTDOOR) 263230 6323AQ2333P THERMISTOR ASSEMBLY 430411 3041A20047F BASE ASSEMBLY, WELD[OUTDOOR] 435301 3530AP1225D GRILLE, DISCHARGE 435512 3550AP1213B COVER ASSY, TOP(OUTDOOR) 437210 3720AP1212B PANEL ASSY, FRONT SUB...
  • Page 75 January, 2005 P/No.: 3828A20156P Printed in Korea...

This manual is also suitable for:

L3-c362ll0L3-c482ll0L2-h242gl0L2-c242gl0

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