1. Manuals
  2. Brands
  3. LG Manuals
  4. Air Conditioner
  5. LM-2320C2L/M
  6. Service manual

LG LM-2320C2L/M Service Manual

Multi type room air conditioner
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Multi Type Room

Air Conditioner

SERVICE MANUAL
MODEL: LM-2320C2L/M

Advertisement

Table of Contents
loading

Related Manuals for LG LM-2320C2L/M

Summary of Contents for LG LM-2320C2L/M

  • Page 1: Air Conditioner

    Multi Type Room Air Conditioner SERVICE MANUAL MODEL: LM-2320C2L/M...

  • Page 2: Table Of Contents

    Contents Functions............................3 Product Specifications ........................ 5 Dimensions........................... 6 Refrigeration Cycle Diagram....................... 8 Wiring Diagram ..........................9 Operation Details ........................10 Display Function ........................14 Self-diagnosis Function ......................14 Installation ..........................15 Operation ............................ 29 Disassembly of the parts (Indoor Unit) ..................31 2-way, 3-way Valve ........................

  • Page 3: 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 4: Remote Controller

    Remote Controller Operation ON/OFF Operation Mode Selection Cooling Operation Mode.( Auto Operation Mode.( (Cooling Healthy Dehumidification Operation Mode.( model only) Fan Speed Selection (Low) (Med) (High) (CHAOS) Room, Temperature Display : (High: 39°C LOW : 11°C) Temperature Setting Down to 18°C HIGH TEMPERATURE Cooling...

  • Page 5: Product Specifications

    Product Specifications LM-2320C2L/M Operation B-Unit Only A-Unit Only A-Unit + B-Unit Unit Item Cooling Capacity Btu/h(kcal/h) 22,700(5,720) 14,000(3,528) 8,700(2,192) Moisture Removal ℓ/h Power Source ø, V, Hz 1Ø, 220V, 60Hz Indoor Air Circulation /min Outdoor Indoor 41 + 1 38 + 1...

  • Page 6: Dimensions

    Dimensions 1. Indoor Unit Tubing hole cover Installation plate Installation plate ( 14K ) ( 9K ) Left rear piping Right rear piping Left rear piping Right rear piping 80mm 50mm ø70mm ø70mm ( 14K ) ( 9K ) MODEL B-Unit (9K) A-Unit (14K) - 6 -...
  • Page 7 2. Outdoor Unit Gas side 3-Way valve Liquid side 2-Way valve MODEL LM-2320C2L/M 76.5 - 7 -...

  • Page 8: Refrigeration Cycle Diagram

    Refrigeration Cycle Diagram LM-2320C2CL/M LIQUID SIDE CAPILLARY TUBE 2-WAY VALVE HEAT HEAT EXCHANGER EXCHANGER (EVAPORATOR) (CONDENSER) A-UNIT B-UNIT COMPRESSOR GAS SIDE 3-WAY VALVE COMPRESSOR Capillary Pipe Size (Diameter : inch) Max. Max. piping length piping elevation Cooling Liquid 3/8"(1/2") 1/4" 10~15 - 8 -...

  • Page 9: Wiring Diagram

    Wiring Diagram(Indoor Unit & Outdoor Unit) 1. A-Unit(14K) (Indoor Unit) 2. B-Unit(9K) (Indoor Unit) FORCED FORCED MAIN PCB MAIN PCB OPERATION OPERATION AUTO AUTO RESTART RESTART REMOTE REMOTE CONTROL CONTROL MOTOR MOTOR THERMISTOR THERMISTOR STEP STEP SH-CAPA. SH-CAPA. MOTOR MOTOR FUSE FUSE AC250V/T2A...

  • Page 10: 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 11 Fuzzy Operation (Cooling only 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 12 Chaos Swing Mode • By the Chaos Swing key input, the upper/lower vane automatically operates with the Chaos Swing or they are fixed to the desired direction. • While in Chaos Swing mode, the angles of cooling and heating cycle operations are different. Chaos Natural Wind Mode •...
  • Page 13 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 14: Display Function

    Display Function Cooling Model Operation Indicator • Cooling, Soft Dry, Fan Sleep Timer Indicator • Sleep Mode Timer Indicator • Timer Mode Compressor on Indicator DOOR Self-diagnosis Function Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. •...

  • Page 15: 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 16 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 17 (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 18 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 19 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 20 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 21 (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 22 2) Connection of the cable 1. Remove the cover control from the unit by loosen- Outdoor unit ing the screw. Terminal block Connect the wires to the terminals on the control board individually as the following. Over 5mm Holder for Terminal on the OUTDOOR UNIT power supply 1(L)
  • Page 23 (4) Checking the Drainage and Pipe forming 1) Checking the Drainage 1. Remove the Grille from the cabinet • Set the up-and-down air direction louver to open position(horizontally) by finger pressure. • Remove the securing screws. • To remove the Grille, pull lower the left and right side of the grille toward you (slightly tilted) and lift it straight upward.
  • Page 24 2) Connect the cable to the indoor unit 1. Connect the wires to the terminals on the control board individually according to the outdoor unit connection. • Ensure that the color of the wires of outdoor unit and the terminal No. are the same as those of indoor unit respectively.
  • Page 25 3) Form the pipings 1. Wrap the connecting portion of indoor unit with the Insulation material and secure it with Drain hose two Plastic Bands(for the left pipings). Taping • If you want to connect an additional drain hose, the end of the drain-outlet should keep distance from the ground.(Do not dip it into water, and fix it on the wall to avoid swinging in the wind.) Pipings...
  • Page 26 (5) 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 27 (7) Maximum Length of Pipe and Freon Extra Charge Charge amount per 1m CONNECTION TYPE Capacity STANDARD Charge am't(g) Model (Btu/h) LENGTH(m) per 1m LM-2320C2L/M(9K) 8700 LM-2320C2L/M(14K) 14000 B(Length) INDOOR UNIT A(Height) OUTDOOR UNIT C(Height) INDOOR UNIT D(Length) ** A, B mean indoor unit higher located than outdoor unit.
  • Page 28 (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 29: Operation

    Operation (1) Name and Function-Remote Control (Door Closed) 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 30 (2) Name and Function-Remote Control (Door Opened) 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 31: 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 • Set the up-and-down air discharge louver to open position (horizontally) by finger pressure.
  • Page 32 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 33: 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 34 (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 35 (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 1. Confirm that both the liguid side valve and gas 6.
  • Page 36 (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 (OPEN) Hi- handle Check valve (CLOSE) • Procedure 1. Connect the gauge to the charging cylinder. This is different from previous procedures.

  • Page 37: 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 38: 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 39 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 40 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 41: When Indoor Fan Does Not Operate

    4. When indoor Fan does not operate. 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. • The pin of Micom, and the part for driving SSR •...
  • Page 42 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 43: Communication Error

    6. Outdoor unit does not operate at all. Check Outdoor Unit PCB Board Operation Check in Outdoor Items Content Remedy • Power Transformer - About AC220V/240V ± 10% - Check the power voltage (Outdoor unit) • Replace Trans - Input Voltage - About AC14 ±...

  • Page 44: Electronic Control Device

    Electronic Control Device 1. Indoor Unit • MAIN P.C.B. ASSY 2. Display Ass'y - 44 -...

  • Page 45: Schematic Diagram

    Schematic Diagram 1. Indoor Unit -45-...

  • Page 46: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1. Indoor Unit • A-Unit (14K) - 46 -...
  • Page 47 Parts List(A-Unit/14K) QUANTITY PART No. DESCRIPTION LM-2320C2L/M REMARK A-UNIT 1H00843A PLATE INSTALLATION 3H03651A HOLDER, TUBE 4681A20003R MOTOR, BLOWER 3141A20003A CHASSIS ASSY 3H03652A COVER, TUBE 5901AR6141B CROSS FLOW FAN 3H02821B BEARING ASSY 5421A20031E EVAPORATOR ASSY 5421A20032A EVAPORATOR 6711A20010A REMOTE CONTROL ASSY...
  • Page 48 • B-UNIT(9K) - 48 -...
  • Page 49 Parts List(B-Unit/9K) QUANTITY PART No. DESCRIPTION LM-2320C2L/M REMARK B-UNIT 3300A10002A PLATE INSTALLATION 3H03651A HOLDER, TUBE 4681A20003A MOTOR, BLOWER 3141A20001C CHASSIS ASSY 3H03652A COVER, TUBE 5901AR6141A CROSS FLOW FAN 3H02821B BEARING ASSY 5421AR6176A EVAPORATOR ASSY 5421AR6175A EVAPORATOR 6711A20010A REMOTE CONTROL ASSY...
  • Page 50 2. Outdoor Unit - 50 -...
  • Page 51 Parts List(Outdoor Unit) QUANTITY PART No. DESCRIPTION REMARK LM-2320C2L/M 3041AP2741H BASE ASSY(OUTDOOR) 5403AP2740Y CONDENSER ASSY, BENT 4A01556A HOLDER, COND 5417AP2156F COMPRESSOR ASSY 2520UAK2AA COMPRESSOR ASSY 4H00982E ISOLATOR, COMP 4984AR4361A ISOLATOR, COMP 4986U-L001D GASKET 4986U-L001G GASKET 6750U-L016A O.L.P. 6750U-L014A O.L.P. 4970U-L002A...
  • Page 52 May, 2000 P/No.: 3828A30074X Printed in Korea...

Table of Contents