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LG LSC091PMA Service Manual

Service manual
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See also: Owner's Manual , Instruction and Installation Manual

Room Air Conditioner

SERVICE MANUAL

MODEL : LSC091PMA
LSC121PMA

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Summary of Contents for LG LSC091PMA

  • Page 1: Room Air Conditioner

    Room Air Conditioner SERVICE MANUAL MODEL : LSC091PMA LSC121PMA...

  • Page 2: Table Of Contents

    Contents Details of 2003 LG Model Name .................... 3 Functions ..........................4 Product References ......................6 Dimensions ..........................7 Refrigeration Cycle Diagram ....................9 Wiring Diagram........................10 Operation Details ......................... 11 Display Function ........................17 Self-diagnosis Function....................... 17 Installation ..........................18 Operation ..........................

  • Page 3: Details Of 2003 Lg Model Name

    Details of 2003 LG Model Name Code Type Code of Model Meaning Producing Center/ L: ChangWon R22, A: ChangWon R410A, C: ChangWon R407C Refrigerant Type of Air conditioner S: Split Type Air conditioner Cooling/Heating C: C/O, H: H/P, X: C/O + E/H, Z: H/P + E/H...

  • 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 sec at the starting. Time Delay Safety Control •...

  • Page 5: Remote Control

    Remote Control 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) Room, Temperature Checking : (Low:11°C High:39°C) Temperature Setting HIGH TEMPERATURE Down to 18°C...

  • Page 6: Product References

    Product References Items Unit LSC091PMA LSC121PMA 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) Moisture Removal l/h(pts/hr) 1.2(2.6)

  • Page 7: Dimensions

    Dimensions (1) Indoor Unit (9K, 12K) Hanger Hole Fix Hole Pipe Hole MODEL INDOOR UNIT Unit mm(inch) 570(22.4) mm(inch) 568(22.3) mm(inch) 137(5.4)
  • Page 8 (2) Outdoor Unit (9K, 12K) Gas side (3-way valve) Liquid side (2-way valve) MODEL All Models unit mm(inch) 770(30.3) mm(inch) 540(21.3) mm(inch) 245(9.6) mm(inch) 287(11.3) mm(inch) 64(2.5) mm(inch) 518(20.4) mm(inch) 10(0.4) mm(inch) 100(3.9)

  • Page 9: Refrigeration Cycle Diagram

    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" 7.62m(25ft) 15m(50ft) 5m(16ft) 7m(23ft) (Cooling Only) For installation over rated, *a proper quantity of refrigerant should be added for each meter.

  • Page 10: Wiring Diagram

    Wiring Diagram (1) Indoor Unit 9K, 12K (Cooling Only Models, Cooling & Heating Models) (2) 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 11: 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 12 • 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 13 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 14 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 15: Sleep Timer Operation

    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 16: Forced Operation

    Jet Cool Mode Operation (H/P Model) • While in heating mode or Fuzzy operation, the Jet Cool key cannot be input. When it is input while in the other mode operation (cooling, dehumidification, ventilation), the Jet Cool mode is operated. •...

  • Page 17: Display Function

    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 • Timer Mode •...

  • Page 18: Installation

    Installation 1. Installation of indoor, Outdoor unit Read completely, then follow step by step. 1) Select the best location Rooftop Installations: If the outdoor unit is installed on a roof structure, be 1. Indoor unit sure to level the unit. Ensure the roof structure and Do not have any heat or steam near the unit.
  • Page 19 3) Preparing work for Installation 1. Open panel front 2. Cover pipe and cover side remove First,Pull the grille bottom, then remove screws(2 Remove two screws(for fixing cover pipe) pieces), and close grille bottom again. Pull up the cover side of desired connecting direc- The moment of lifting the both lower parts of panel tion, then cover side is separated.
  • Page 20 4) Sticking the installation guide map and fixing Indoor unit 7. Drill the piercing part for connecting pipe as 1. Put an Installation Guide Map on the desired surface. diameter 50mm(1.97"). (In case of piercing rear surface) INSTALLATION GUIDE MAP Refer to No.

  • Page 21: Flaring Work And Connection Of Piping

    2. Flaring Work and Connection of Piping Firmly hold copper pipe in a die in the dimension 1) Flaring work shown in the table above. Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure. Handle 1.
  • Page 22 When extending the drain hose at the indoor unit, 2. Tape the tubing, drain hose and the connecting cable. Be sure that the drain hose is located at the install the drain pipe. lowest side of the bundle. Locating at the upper side can cause drain pan to overflow inside the unit.

  • Page 23: Connection Of The Pipes-Outdoor

    3) Connection of the pipes-Outdoor CAUTION Installation Information (For right piping) 1. Align the center of the pipings and sufficiently • Good case tighten the flare nut by hand. For right piping, follow the instruction below. Press on the upper side of clamp and unfold the tubing to downward slowly.

  • Page 24: Connecting The Cable Between Indoor Unit And Outdoor Unit

    3. Connecting The Cable Between Indoor Unit and Outdoor Unit 1) Connection of the cable 1. Remove the cover control from the unit by loosening the 3 screws. Wiring Diagram 2. Dismount caps on the conduit panel. Connecting cable(Low voltage) b Indoor Unit Outdoor Unit 3.
  • Page 25 2) Connection method of the connecting cable(Example) (1) Dismount two-caps on the conduit panel. (2) Make a hole appropriate for the passage of connection cable through on cap by tool. (for low voltage line) (3) Pass the connecting cable through the hole. Terminal (4) Properly connect the cable on the terminal block.

  • Page 26: Checking The Drainage And Forming The Pipings

    4. checking the Drainage and forming the pipings 2) Form the piping 1) Checking the drainage 1. Form the piping by wrapping the connecting por- 1. To check the drainage. tion of the indoor unit with insulation material and secure it with two kinds of vinyl tapes. Pour a glass of water on the evaporator.
  • Page 27 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 Circuit Breaker Conditioner Use a circuit breaker or time delay fuse. 3) Connect the cable to the indoor unit 1.

  • Page 28: Air Purging

    5. Air Purging 1) Air purging • Do a leak test of all joints of the tubing(both indoor and outdoor) and both gas and liquid side service valves. Air and moisture remaining in the refrigerant system Bubbles indicate a leak. Be sure to wipe off the soap have undesirable effects as indicated below.
  • Page 29 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 sec, and close it.

  • Page 30: Panel Front Assembly

    6. Panel Front Assembly 1. First, Check the side cover assembly exactly, Fix power cord in the bottom groove of cover side left. 2. Assemble connecting lead wire with controller and first fix the upper part of panel front, then match the lower part of panel front Panel Front Connector...

  • Page 31: Test Running

    7. Test Running 1. Check that all tubing and wiring have been properly Intake temperature connected. Discharge air 2. Check that the gas and liquid side service valves are fully open. 1. Prepare remote control 1. Remove the battery cover by pulling it according to the arrow direction.

  • Page 32: Operation

    Operation Name and Function-Remote Control The remote control transmits the signals to the system. START/STOP BUTTON Operation starts when this button is pressed and stops when the button is pressed again. Signal transmitter OPERATION MODE SELECTION BUTTON Used to select the operation mode. ROOM TEMPERATURE SETTING BUTTONS Used to select the room temperature.

  • Page 33: Disassembly Of The Parts (Indoor Unit)

    Disassembly of the parts (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 34 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. Air Guide Top Cover - Remove the securing screws from the chassis. - Pull the pipe cover, top cover and the air guide. Pipe Cover 5.

  • Page 35: 2-Way, 3-Way Valve

    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 36 1. Air purging Required tools : hexagonal wrench, adjustable The air in the indoor unit and in the piping must be wrench, torque wrenches, wrench to purged. If air remains in the refrigeration pipes, it will hold the joints, and gas leak affect the compressor, reduce to cooling capacity, and detector.

  • Page 37: Pumping Down

    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 38 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 (1) Confirm that both the 2-way valve and the 3- cylinder, and set the 2-way and 3-way valves way valve are set to the closed position.
  • Page 39 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 are set to the back seat.
  • Page 40 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 –...

  • Page 41: Gas Charging

    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 42: Cycle Troubleshooting Guide

    Cycle Troubleshooting Guide 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 43 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. Check the voltage of power(About AC 208V/AC230V, 60Hz) •...
  • Page 44 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 45 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).

  • Page 46: When Indoor Fan Does Not Operate

    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 Indoor unit corresponds to the values in the table of page 51? CONNECTOR Do the voltage of terminal of...
  • Page 47 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 48 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 49: Indoor Unit

    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 50: Outdoor Unit

    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 51 9. Voltage of Connectors according to Indoor Fan Speed - 51 -...

  • Page 52: Electronic Control Device

    Electronic Control Device (1) 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 6871A20387B OPEN OPEN OPEN OPEN 9K Cooling Model 6871A20387B OPEN OPEN...
  • Page 53 (2) MAIN PWB ASSY(Outdoor Unit) • PWB ASSY SVC PART LIST OPTIONAL FUNCTION MODEL P/No. OR4H OR5H OR6H OR7H OR 8H FUSE RY-4WAY RY-FAN CN-TH HEATER 4WAY 12K Cooling Model 6871A10036N 5.1K 125V 3.15A 9K Cooling Model 6871A10036M 5.1K 356K OPEN - 53 -...
  • Page 54 (3) DISPLAY PWB ASSEMBLY • TOP VIEW • BOTTOM VIEW (4) 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 - 54 -...

  • Page 55: Schematic Diagram

    Schematic Diagram 1. Indoor Unit BL PK YL OR RD BL PK AVdd1 AVss PK BL - 55 -...
  • Page 56 2. Outdoor Unit - 56 -...

  • Page 57: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1. Indoor Unit -57-...
  • Page 58 Parts List(indoor) PART No. LOCATION DESCRIPTION REMARKS LSC091PMA LSC121PMA 131410 CHASSIS ASSEMBLY 3141A20004K 135303 GRILLE,INLET 3530A10071D 135311-1 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A20069M 135311-2 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A20069N 135311-3 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A20069P 135312 GRILLE ASSEMBLY,FRONT(INDOOR) 3531A20181L 135314 GRILLE ASSEMBLY,INLET 3531A20183L 135500-1 COVER 3550A20123A 135500-2 COVER...
  • Page 59 2. Outdoor unit(9K, 12K) -59-...
  • Page 60 Parts List(outdoor) PART No. LOCATION DESCRIPTION Q'TY REMARKS LSC091PMA LSC121PMA 552203-1 VALVE,SERVICE 2H02479H 5220A20005B 552203-3 VALVE,SERVICE 2H01890L 5220A20003B 554031 CONDENSER ASSY,BENT 5403A20026D 5403A20019B 554160 COMPRESSOR SET 2520UKAC2HA 2520UKWC2HA 559010 FAN ASSY,PROPELLER 5901A10004A 5901A10004A 567502 O.L.P 6750U-L031A 6750U-L029A 649950 CONTROL BOX ASSY, OUTDOOR...
  • Page 61 MEMO -61-...
  • Page 62 MEMO -62-...
  • Page 63 July, 2003 P/No.: 3828A20135N Printed in Korea...

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