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LG HMC24AD Service Manual
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LG HMC24AD Service Manual

LG HMC24AD Service Manual

Multi type room air conditioner
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Owner's Manual
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Summary of Contents for LG HMC24AD

  • Page 1 This Owner's Manual is provided and hosted by Appliance Factory Parts. LG HMC24AD Owner's Manual Shop genuine replacement parts for LG HMC24AD Find Your LG Air Conditioner Parts - Select From 2328 Models -------- Manual continues below --------...
  • Page 2 Multi Type Room Air Conditioner SERVICE MANUAL MODEL: LM-1830C2L/M/N LM-1830H2L/M/N LM-2430C2L/M/N LM-2430H2L/M L2-C243AL1...

  • Page 3: Table Of Contents

    Contents Functions............................3 Product Specifications ........................ 5 Dimensions........................... 9 Refrigeration Cycle Diagram..................... 11 Wiring Diagram .......................... 12 Operation Details ........................13 Display Function ........................20 Self-diagnosis Function ......................20 Installation ..........................21 Operation ............................ 35 Disassembly of the parts (Indoor Unit) ..................37 2-way, 3-way Valve ........................

  • Page 4: 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 5 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(102˚F) LOW : 11°C(52˚F) Temperature Setting HIGH TEMPERATURE...

  • Page 6: Product Specifications

    Product Specifications 1. LM-1830C2L/M Operation A-Unit B-Unit A-Unit + B-Unit Remarks Only Only Unit Item Cooling Capacity 17,000/18,000 8,500/9,000 8,500/9,000 208/230V Btu/h(kcal/h) – – – Heating Capacity Moisture Removal at 230V Power Source ø, V, Hz 1Ø, 208/230V, 60Hz Indoor –...
  • Page 7 2. LM-1830H2L/M Operation A-Unit B-Unit A-Unit + B-Unit Remarks Only Only Unit Item Cooling Capacity 17,000/18,000 8,500/9,000 8,500/9,000 208/230V Btu/h(kcal/h) 17,000/18,000 8,500/9,000 8,500/9,000 Heating Capacity Moisture Removal at 230V Power Source ø, V, Hz 1Ø, 208/230V, 60Hz Indoor – 7.0/7.6 7.0/7.6 Cooling/Heating Air Circulation...
  • Page 8 3. LM-2430C2L/M Operation A-Unit B-Unit A-Unit + B-Unit Remarks Only Only Unit Item Cooling Capacity 23,600/24,000 11,800/12,000 11,800/12,000 208/230V Btu/h(kcal/h) – – – Heating Capacity Moisture Removal at 230V Power Source ø, V, Hz 1Ø, 208/230V, 60Hz Indoor – Air Circulation /min Outdoor Indoor...
  • Page 9 4. LM-2430H2L/M Operation A-Unit B-Unit A-Unit + B-Unit Remarks Only Only Unit Item 23,600/24,000 11,800/12,000 11,800/12,000 Cooling Capacity 208/230V Btu/h(kcal/h) Heating Capacity 23,600/24,000 11,800/12,000 11,800/12,000 at 230V Moisture Removal Power Source ø, V, Hz 1Ø, 208/230V, 60Hz Indoor – 8.0/8.6 8.0/8.6 Cooling/Heating Air Circulation...

  • Page 10: Dimensions

    Dimensions 1. Indoor Unit Installation plate Tubing hole cover Installation plate Left rear piping Right rear piping Left rear piping Right rear piping 80mm 50mm ø70mm ø70mm ( LM-1830C2L/M, LM-1830H2L/M ) ( LM-2430C2L/M, LM-2430H2L/M ) MODEL LM-1830C2L/M, LM-1830H2L/M LM-2430C2L/M, LM-2430H2L/M Hanger Hole Pipe Hole Fix Hole...
  • Page 11 2. Outdoor Unit Gas side 3-Way valve Liquid side 2-Way valve MODEL LM-1830C2L/M, LM-1830H2L/M, LM-2430C2L/M, LM-2430H2L/M,L2-C243AL1 76.5 - 10 -...

  • Page 12: Refrigeration Cycle Diagram

    Refrigeration Cycle Diagram 1. LM-1830C2L/M, LM-2430C2L/M,L2-C243AL1 (Cooling only models) LIQUID SIDE CAPILLARY TUBE 2-WAY VALVE HEAT HEAT EXCHANGER EXCHANGER (EVAPORATOR) (CONDENSER) A-UNIT B-UNIT COMPRESSOR GAS SIDE 3-WAY VALVE COMPRESSOR 2. LM-1830H2L/M, LM-2430H2L/M (Cooling & Heating modes) Indoor Unit Outdoor Unit COOLING HEATING COMPRESSOR-A...

  • Page 13: Wiring Diagram

    Wiring Diagram 1. INDOOR UNIT: LM-1830C2L/M, LM-1830H2L/M, LM-2430C2L/M, LM-2430H2L/M FORCED OPERATION AUTO RESTART REMOTE CONTROL MOTOR THERMISTOR STEP MOTOR MAIN PCB ASSY CN-DISP1 DISPLAY PCB ASSY PILLAR TERMINAL INDOOR WIRING DIAGRAM TO OUTDOOR UNIT 3854A20075M 2. OUTDOOR UNIT • LM-1830C2L/M •...

  • Page 14: Operation Details

    Operation Details 1. MAIN UNIT FUNCTION • DISPLAY 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 15 • 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. Setting Temp+0.5°C Compressor OFF Temp.
  • Page 16 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 17 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 18 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 19 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 20 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 21: 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 • Timer Mode •...

  • Page 22: 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 23 2) Indoor Unit Installation (Standard type) 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 24 (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 25 2) Connection of Pipings (Standard type) 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 26 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 27 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. Drain hose Taping Piping...
  • Page 28 (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 29 Connection of the cable Outdoor unit 1. Remove the cover control from the unit by loosening the screw. Terminal block Over 5mm A-UNIT B-UNIT Holder for power supply cord Power Source Power supply 208/230V AC Connecting cable(Low voltage) Connecting cable(Low voltage) (High voltage) cable Cover control...
  • Page 30 Connection method of the connecting cable(Example) (1) Dismount two-caps on the conduit panel. Terminal (2) Make a hole appropriate for the passage of connec- block tion cable through on cap by tool. (for low voltage line) (3) Pass the connecting cable through the hole. Clamp cord (4) Properly connect the cable on the terminal block.
  • Page 31 CAUTION 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 Power source Fuse or breaker Model Circuit Breaker Conditioner Capacity Use a circuit 1ø,230/208V breaker or time 1ø,230/208V...
  • Page 32 (4) Checking the drainage (5) Form the piping 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 cabi- tion of the indoor unit with insulation material and net.
  • Page 33 (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 34 (7) Maximum Length of Pipe and Freon Extra Charge Charge amount per 1m CONNECTION TYPE STANDARD Charge am't(g) Model LENGTH(m) per 1m LM-1830C2L/M LM-1830H2L/M LM-2430C2L/M LM-2430H2L/M 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 35 (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 36: Operation

    Operation (1) Name and Function-Remote Control (Door Closed, Standard Type) Remote Control Signal transmitter Transmits the signals to the room air conditioner. Signal transmitter START/STOP BUTTON Operation starts when this button is pressed and stops when the button is pressed again. OPERATION MODE SELECTION BUTTON Used to select the operation mode.
  • Page 37 (2) Name and Function-Remote Control (Door Opened, Standard Type) Remote Control Signal transmitter Transmits the signals to the room air conditioner. Signal transmitter ON/OFF TIMER BUTTONS Used to set the time of starting and stopping operation. TIME SETTING BUTTONS Used to adjust the time. TIMER SET/CANCEL BUTTONS Used to set the timer when the desired time is obtained and to cancel the Timer operation.

  • Page 38: Disassembly Of The Parts (Indoor Unit)

    Disassembly of the parts (Indoor unit, Standard Type) 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. • Set the up-and-down air discharge louver to open position (horizontally) by finger pressure.
  • Page 39 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. 4. To remove the Evaporator. •...

  • Page 40: 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 Shaft position...
  • Page 41 (1) Pumping down Liquid side Indoor unit Outdoor unit Close 2-Way valve Gas side Open 3-Way valve Liquid side Indoor 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.
  • Page 42 (2) Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Open 3-Way valve Liquid side Indoor unit Open 2-Way valve Gas side Open 3-Way valve manifold gauge Vacuum pump Low- handle Hi- handle (OPEN) (OPEN) •...
  • Page 43 (3) Gas Charging (After Evacuation) Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Open 3-Way valve Liquid side Indoor unit Open 2-Way valve Gas side Open 3-Way valve manifold gauge Charging cylinder Low-handle (OPEN) Hi- handle Check valve (OPEN) •...

  • Page 44: 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. Difference Refrigerant leakage Temp.
  • Page 45 Comp basic step. Free joint outdoor unit has two compressor (TPS: Twin power system) Step Step 1 Step 2 Step 3 Outdoor Operation Mode COMP 40%(B)only COMP 60%(A)only COMP 100%(A+B) together 18k(Max. 19k) Cooling Qs<=7k Qs<=12k 12k<Qs Heating Qs<=9k 12k<Qs 21k(Max.

  • Page 46: Electronic Parts Troubleshooting Guide

    Electronic Parts Troubleshooting Guide 1. 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 47 2. The product is not operate with the remote control. 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 48 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 49 4. When indoor Fan does not operate.(or "ON/OFF" led of display blinks 8 times) Turn off Main power Check it (Indoor/Outdoor)the connection line is complied with Wiring Diagram Bad connection Good connection Correct connection line Check the line fuse in the outdoor unit Check the connection of CN-MOTOR check the operation of blower by manual Check POLY S/W in indoor PCB Ass'y...
  • Page 50 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 • Check the connecting condition of CN-U/D Connector •...
  • Page 51 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 52 7. Outdoor unit does not operate at all. Check Outdoor Unit PCB Board Operation Check in Outdoor Content Remedy Items • Power Transformer (Outdoor unit) - About AC220V/240V ± 10% - Check the power voltage • Replace Trans - Input Voltage - About AC14 ±...

  • Page 53: Electronic Control Device

    Electronic Control Device 1. Indoor • MAIN P.C.B ASM - 52 -...
  • Page 54 2. Outdoor • MAIN P.C.B ASM -53-...
  • Page 55 3. Display Ass'y - 54 -...

  • Page 56: Schematic Diagram

    Schematic Diagram 1. Indoor - 55 -...
  • Page 57 2. Outdoor -56-...

  • Page 58: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1. Indoor Unit (LM-1830C2L/M, LM-1830H2L/M) - 57 -...
  • Page 59 Parts List-Indoor Unit (LM-1830C2L/M/N, LM-1830H2L/M/N) PART NO. LOCATION DESCRIPTION REMARKS LM-1830C2L LM-1830C2M LM-1830C2N LM-1830H2L LM-1830H2M LM-1830H2N 131410 CHASSIS ASSY 3141A20001D 3141A20001B 3141A20001B 3141A20001D 3141A20001B 3141A20001B 135311 GRILLE ASSY, DISCHARGE(INDOOR) 3531A10005N 3531A10005P 3531A10005P 3531A10005N 3531A10005P 3531A10005P 135312 GRILLE ASSY, FRONT 3531A10001Z 3531A10051R 3531A10073C 3531A10001Y 3531A10051Q 3531A10073G 135511 COVER ASSY, CONTROL(INDOOR) 3550AR3724U 3550AR3724V 3550AR3724V 3550AR3724U 3550AR3724V 3550AR3724V...
  • Page 60 2. Indoor Unit (LM-2430C2L/M, LM-2430H2L/M) - 59 -...
  • Page 61 Parts List-Indoor Unit (LM-2430C2L/M, LM-2430H2L/M) PART NO. LOCATION DESCRIPTION REMARKS LM-2430C2L LM-2430C2M LM-2430C2N LM-2430H2L LM-2430H2M 131410 CHASSIS ASSY 3141A20003B 3141A20003D 3141A20003D 3141A20003B 3141A20003D 135311 GRILLE ASSY, DISCHARGE(INDOOR) 3531A10023W 3531A10023X 3531A10023X 3531A10023W 3531A10023X 135312 GRILLE ASSY, FRONT 3531A10024K 3531A10098B 3531A10099J 3531A10024K 3531A10098A 135511 COVER ASSY, CONTROL(INDOOR) 3550A30035X...
  • Page 62 Indoor Unit (L2-C243AL1) - 61 -...
  • Page 63 PART NO. LOCATION DESCRIPTION REMARKS L2-C243AL1 131410 CHASSIS ASSY 3141A20004N 135500-1 COVER 3550A20123A 135500-2 COVER 3550A20124A 135500-3 COVER 3550A20060A 135311-1 GRILLE ASSY, DISCHRAGE(INDOOR) 3531A20069G 135311-2 GRILLE ASSY, DISCHRAGE(INDOOR) 3531A20069H 135311-3 GRILLE ASSY, DISCHRAGE(INDOOR) 3531A20069J 135314 GRILLE ASSY, INLET 3531A20212K 135515 COVER ASSY, TOP (INDOOR) 3551A20031B 135316...
  • Page 64 3. Outdoor Unit (LM-1830C2L/M, LM-2430C2L/M, L2-C243AL1) - 63 -...
  • Page 65 Parts List-Outdoor Unit (LM-1830C2L/M, LM-2430C2L/M,L2-C243AL1) PART NO. REMARKS LOCATION NO. DESCRIPTION LM-1830C2L/M LM-2430C2L/M L2-C243AL1 137213 PANEL ASSY, REAR 3720AP0003F 3720AP0003F 3720AP0003F 261704 TRANSFOMER, POWER 6171AQ3198A 6171AQ3198A 6171AQ3198A 266310 LEAD WIRE ASSY 6631AQ3137Z 6631AQ3137Z 6631AQ3137Z 268716 PWB(PCB)ASSY, MAIN(OUTDOOR) 6871A10043B 6871A10043B 6871A10043B 268717 PWB(PCB)ASSY, MAIN(AC) 6871A20155B...
  • Page 66 4. Outdoor Unit (LM-1830H2L/M, LM-2430H2L/M) - 65 -...
  • Page 67 Parts List-Outdoor Unit (LM-1830H2L/M, LM-2430H2L/M) PART NO. LOCATION NO. DESCRIPTION REMARKS LM-1830H2L/M LM-2430H2L/M 137213-1 PANEL ASSY, SIDE-L 1A00201D 1A00201D 137213-2 PANEL ASSY, SIDE-R 3A02284M 3A02284M 435300 GRILLE, REAR 1A00207B 1A00207B 261704 TRANSFOMER, POWER 6171AQ3198A 6171AQ3198A 266310 LEAD WIRE ASSY 6631AQ3137Z 6631AQ3137Z 268716 PWB(PCB)ASSY, MAIN(OUTDOOR)
  • Page 68 July, 2005 P/No.: 3828A20097A Printed in Korea...

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