LG LSC091PMA Service Manual
LG LSC091PMA Manual
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LG LSC091PMA manual content summary:
- LG LSC091PMA | Service Manual - Page 1
Room Air Conditioner SERVICE MANUAL MODEL : LSC091PMA LSC121PMA - LG LSC091PMA | Service Manual - Page 2
...6 Dimensions ...7 Refrigeration Cycle Diagram 9 Wiring Diagram...10 Operation Details ...11 Display Function ...17 Self-diagnosis Function...17 Installation ...18 Operation ...33 Disassembly of the parts (Indoor Unit 33 2-way, 3-way Valve...35 Cycle Troubleshooting Guide 42 Electronic Control - LG LSC091PMA | Service Manual - Page 3
LG Model Name 12 - 3 4 5 6 7 8 9 10 Code 1 2 3 4,5 6 7 8 9 Type Code of Model Meaning Producing Center/ A~Z Refrigerant /50Hz 5 ➔ 200~220V/50Hz 9 ➔ 380~415V/60Hz Chassis A~Z Name of tool of unit Color A~Z R: Mirror W: White B: Blue M: Metal N: Walut C: Cherry Function A~Z Basic - LG LSC091PMA | Service Manual - Page 4
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 Heating) speed. • The unit will be stopped after 1, - LG LSC091PMA | Service Manual - Page 5
Remote Control Operation ON/OFF Operation Mode Selection (Cooling (Heating model only) model only) Cooling Operation Mode.( ) Healthy Dehumidification Operation Mode.( Fan Speed Selection Auto Operation Mode.( ) ) Heating Operation Mode.( ) (Low) (Med) Room, Temperature Checking : (Low:11°C - LG LSC091PMA | Service Manual - Page 6
Healthy Dehumidification Mode Restart Delay minutes Refrigerant(R-22) Charge g(oz) Power cord AWG #: Indoor mm (WxHxD) in Outdoor mm in Net Weight Indoor kg(lbs) Outdoor kg(lbs) LSC091PMA 1, 115V, 60 9,000 940 8.5 46 9.6 7.1(250) 1.2(2.6) 39 34 30 46 Thermistor 4-way 3/4 Auto Manual - LG LSC091PMA | Service Manual - Page 7
Dimensions (1) Indoor Unit (9K, 12K) W D H Hanger Hole Pipe Hole Fix Hole MODEL DIM Unit W mm(inch) H mm(inch) D mm(inch) INDOOR UNIT 570(22.4) 568(22.3) 137(5.4) -7- - LG LSC091PMA | Service Manual - Page 8
, 12K) W L2 D L1 L3 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) L5 Gas side (3-way - LG LSC091PMA | Service Manual - Page 9
Refrigeration Cycle Diagram • Cooling Only Models INDOOR UNIT OUTDOOR UNIT LIQUID SIDE CAPILLARY TUBE HEAT EXCHANGER (EVAPORATOR) GAS SIDE HEAT EXCHANGER (CONDENSER) COMPRESSOR MODEL 9K, 12K (Cooling Only) Pipe size(Diameter:ø) Gas Liquid 1/2" 1/4" Piping length - LG LSC091PMA | Service Manual - Page 10
C F CN-TRANS TRANSFORMER (2) Outdoor Unit (9K, 12K) BL MAIN P.C.B RD YL T/B 1 BL BL BR ZNR BK MOTOR RD FUSE 3.15A BK RY-COMP 3 4 CN-POWER CN-DC/DC BR BL RD BR BK BL FUSE 2.5A H BR YL BR RSC COMP. O.L.P BL TERMINAL BLOCK (N) (L) G TO INDOOR UNIT POWER INPUT OUTDOOR WIRING - LG LSC091PMA | Service Manual - Page 11
operation pause. Timer Indicator • ON while in timer mode (on/off), OFF when timer mode is completed or canceled. Comp. Running Incidator • While in appliance operation, ON while in outdoor unit compressor running, OFF while in compressor off. 2) H/P Model Operation Indicator • ON while in - LG LSC091PMA | Service Manual - Page 12
in defrost control, both of the indoor and outdoor fans are turned off. s Defrost Control • While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing, reversed to cooling cycle to defrost the evaporator pipe of the outdoor unit. • After 40 min heating - LG LSC091PMA | Service Manual - Page 13
, the operation mode is selected. • When determining the operation mode, the compressor, the outdoor fan, and the 4 way valve are off and only the indoor fan is operated for 15 seconds. Then an operation mode is selected according to the intake air temp at that moment as follows. 24°C ≤ Inatake - LG LSC091PMA | Service Manual - Page 14
and the setting temperature. s Airflow Speed Selection • The airflow speed of the indoor fan is set to high, medium, low, or chaos (auto) by the input set time is reached after the time is input by the remote control, the appliance starts to operate. • The timer LED is on when the on-timer is - LG LSC091PMA | Service Manual - Page 15
It is off when the time set by the timer is reached. • If the appliance is on pause at the time set by the timer, the pause continues. s 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 speed for - LG LSC091PMA | Service Manual - Page 16
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. s 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 - LG LSC091PMA | Service Manual - Page 17
Indicator • Timer Mode Compressor on Indicator OUTDOOR Self-diagnosis Function Error Code 1 Error Display LED (Indoor body operation LED) (once) 3sec 3sec 3sec Error contents • Indoor room temperature thermistor open/short • Indoor pipe temperature thermistor open/short. SVC check point - LG LSC091PMA | Service Manual - Page 18
(24.6ft) 7.5 (24.6ft) Max. Max. Additional Elevation length Refrigerant B (m) A (m) (g/m) 7 15 (23ft) (50ft) 20 7 15 (23ft) (50ft) 20 More than 2m(6.6ft) More than 50cm(19.7") Outdoor unit Indoor unit CAUTION Install the indoor unit on the wall where the height from the floors more than 2m - LG LSC091PMA | Service Manual - Page 19
3) Preparing work for Installation 1. Open panel front s First,Pull the grille bottom, then remove screws(2 pieces), and close grille bottom again. s The moment of lifting the both lower parts of panel front, you can hear sound this panel came out, In this time panel front is separated s After pull - LG LSC091PMA | Service Manual - Page 20
Sticking the installation guide map and fixing Indoor unit 1. Put an Installation Guide Map on the desired surface. INSTALLATION GUIDE MAP 7. attention) INSTALLATION GUIDE MAP In case of nothing wrong in the matter, connect the pipe and the wire. (Installation manual reference) Hanger hole - LG LSC091PMA | Service Manual - Page 21
tube Even length all round Inclined Surface Cracked Uneven damaged thickness 2) Connection of piping-Indoor s Preparing the indoor unit's piping and drain hose for installation through the wall. 1. Route the indoor tubing and the drain hose in the direction of rear left or right 4. Flaring - LG LSC091PMA | Service Manual - Page 22
drain hose Adhesive Vinyl tape(narrow) 4. Wrap the insulation material around the connecting portion. s Overlap the connection pipe insulation material and the indoor unit pipe insulation material. Bind them together with vinyl tape so that there is no gap. NOTE: If the drain hose is routed inside - LG LSC091PMA | Service Manual - Page 23
(For right piping) • Good case For right piping, follow the instruction below. s Press on the upper side of clamp and unfold the tubing could cause problem of pipe damage. OOuuttddoooorr uunniitt Outdoor unit GLiaqsuisdidseidpeippinipging L(S((iBqSmuimgaidglaleselrilrdededriaipadmimipaeinetmegtree - LG LSC091PMA | Service Manual - Page 24
sure to comply with local codes while running the wire from the indoor unit to the outdoor unit(size of wire and wiring method, etc). • Every 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 - LG LSC091PMA | Service Manual - Page 25
Loose wiring may cause the terminal to overheat or result in unit malfunction. A fire hazard may also exist. Therefore, be sure all wiring is tightly connected. When connecting each power wire to the corresponding terminal, follow instructions "How to connect wiring to the terminals" and fasten the - LG LSC091PMA | Service Manual - Page 26
, the end of the drain outlet should be routed above the ground. Secure the drain hose appropriately. 2. In cases where the outdoor unit is installed below the indoor unit perform the following. s Tape the piping, drain hose and connecting cable from down to up. s Secure the tapped piping along the - LG LSC091PMA | Service Manual - Page 27
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. can cause the unit to misoperate to result in a fire hazard. • Check local electrical codes and any specified wiring instructions or limitations. - LG LSC091PMA | Service Manual - Page 28
(or heating) efficiency drops. • Moisture in the refrigerant circuit may freeze and block capillary tubing. • Water may lead to corrosion of parts in the refrigera- tion system. Therefore, the indoor unit and tubing between the indoor and outdoor unit must be leak tested and evacuated to remove any - LG LSC091PMA | Service Manual - Page 29
3. Evacuation • Connect the charge hose end described in the preceding steps to the vacuum pump to evacuate the tubing and indoor unit. Confirm the "Lo" . Gas side Liquid side Cap Hexagonal wrench Indoor unit Outdoor unit 4. Finishing the job • With a service valve wrench, turn the valve stem of - LG LSC091PMA | Service Manual - Page 30
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 3. Drive - LG LSC091PMA | Service Manual - Page 31
an anti-vibration bushing. Bolt Tubing connection 3. Evaluation of the performance Operate unit for 15~20 minutes, then check the system refrigerant charge: 1. Measure the pressure of the gas side service valve. 2. Measure the temperature of the intake and discharge of air. 3. Ensure the difference - LG LSC091PMA | Service Manual - Page 32
is pressed again. 2 OPERATION MODE SELECTION BUTTON Used to select the operation mode. 3 ROOM TEMPERATURE SETTING BUTTONS Used to select the room temperature. 4 INDOOR FAN SPEED SELECTOR Used to select fan speed in four steps low, medium, high and CHAOS. 5 JET COOL/HEATING Used to start or stop the - LG LSC091PMA | Service Manual - Page 33
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 - LG LSC091PMA | Service Manual - Page 34
carefully. 4. Before removing the Turbo Fan. - Remove the securing screws from the chassis. - Pull the pipe cover, top cover and the air guide. Top Cover Air Guide 5. To remove the Motor. - Remove the securing bolt from the motor shaft. - Pull the fan out from the motor shaft. - Remove 4 screws - LG LSC091PMA | Service Manual - Page 35
Pin To piping connection Service Service port cap port To outdoor unit Works Shipping Air purging 1. (Installation) Operation Pumping down 2. (Transfering) Evacuation 3. (Servicing) Gas charging 4. (Servicing) Pressure check 5. (Servicing) Gas releasing 6. (Servicing) Shaft position Closed - LG LSC091PMA | Service Manual - Page 36
and the charge set will be needed. The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration pipes, it way valve to the open position and remove the cap from the 3-way valve's service port. - Using the hexagonal wrench to press the valve core pin, discharge - LG LSC091PMA | Service Manual - Page 37
down Indoor unit Liquid side Open 2-Way valve Outdoor unit Gas unit for 10 to 15 minutes. (3) Stop operation and wait for 3 minutes, then connect the charge set to the service port of the 3-way valve. - Connect the charge hose with the push pin to the service port. (4) Air purging of the charge - LG LSC091PMA | Service Manual - Page 38
) Indoor unit Liquid side Closed 2-Way valve Outdoor unit Gas cylinder Gas side Closed 3-Way valve Lo R22 OPEN CLOSE • Procedure (1) Confirm that both the 2-way valve and the 3way valve are set to the closed position. (2) Connect the charge set and a gas cylinder to the service port - LG LSC091PMA | Service Manual - Page 39
2) Balance refrigerant of the 2-way, 3-way valves (Gas leakage) Indoor unit Liquid side 2-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 valves are set to the back seat. (2) Connect the charge set to the 3-way valve - LG LSC091PMA | Service Manual - Page 40
3. Evacuation (All amount of refrigerant leaked) Indoor unit Liquid side 2-Way valve Open Outdoor unit Gas side 3-Way valve Open Vacuum pump OPEN Lo CLOSE • Procedure (1) Connect the vacuum pump to the charge set's center hose (2) Evacuation for approximately one hour. - Confirm that the - LG LSC091PMA | Service Manual - Page 41
4. Gas Charging (After Evacuation) Indoor unit Liquid side Open 2-Way valve Outdoor unit Charging cylinder Check valve Gas side Open 3-Way valve Lo (1) OPEN CLOSE • Procedure (1) Connect the charge hose to the charging cylinder. - Connect the charge hose which you disconnected from the - LG LSC091PMA | Service Manual - Page 42
Troubleshooting Guide 1. Trouble analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. Difference Operating Current Temp. difference :approx. 0°F Current :less than 80% of rated current All amount of refrigerant leaked out. Check refrigeration - LG LSC091PMA | Service Manual - Page 43
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? NO YES Check the voltage of power(About AC 208V/AC230V, 60Hz) • Main power's voltage • Voltage applied to the - LG LSC091PMA | Service Manual - Page 44
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. (When operated in the Sleeping - LG LSC091PMA | Service Manual - Page 45
of R02(12.1K), R04(6.2K), Micom (No.27) (Indoor unit). • Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 25°C). connecting wire terminal support transferred to compressor, PWB Ass'y is normal. • Check the circuit related to the relay(Outdoor unit). Check point COMP - LG LSC091PMA | Service Manual - Page 46
to the values in the table of page 51? Check the pattern and the condition of Indoor unit PWB Ass'y. Check the interference of Indoor Fan. NO YES Check the patterns and the conditions of outdoor unit PWB Assy's. Check the connecting condition and disconnection of connecting wires between - LG LSC091PMA | Service Manual - Page 47
- Between 57 , 56 , 55 and 54 of MICOM - Between 51 , 50 , 49 and 48 of MICOM - Between 1 , 2 , 3 , 4 and 5 of CN-U/D, CN-L/R 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 - 47 - - LG LSC091PMA | Service Manual - 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 - LG LSC091PMA | Service Manual - Page 49
terminals Open Open Short between terminals ( and ) of ROOM-TH. Short between terminals ( and ) of PIPE-TH. • The indoor fan does not operate. • The operation indicator of Indoor unit blinks 8 times. • The up/down vane does not operate. • The up/down vane does not smoothly operate. • It does - LG LSC091PMA | Service Manual - Page 50
for long time. • The signal of the remote controller is inputted. • The fuse and Q61 in the Outdoor unit are damaged when the indoor fan is operated. • No power for Indoor unit. • The signal input of the remote controller and operation of product is impossible. • The RED indicator of the Outdoor - LG LSC091PMA | Service Manual - Page 51
PWB ASSY 1234 BL BK BR RD Input Power POWER TRANS BK BK BL 12 CN-POWER 123456 CN-TRANS Connecting wires between Indoor and Outdoor Indoor Connecting Terminal Outdoor Connecting Terminal 4 3 RY-COMP CN-DC/DC 1 BL 2 BK 3 BR 4 RD MODELS No. of pins 9K DC Voltage(±10%) 12K DC Voltage - LG LSC091PMA | Service Manual - Page 52
Electronic Control Device (1) MAIN PWB ASSY(Indoor Unit) • TOP VIEW • BOTTOM VIEW • PWB ASSY SVC PART LIST NO MODEL 1 12K Cooling Model 2 9K Cooling Model OJ1H : Short OJ2H, OJ3H, OJ4H : OPEN P/No. 6871A20387B - LG LSC091PMA | Service Manual - Page 53
(2) MAIN PWB ASSY(Outdoor Unit) • PWB ASSY SVC PART LIST NO MODEL P/No. OPTIONAL FUNCTION OR4H OR5H OR6H OR7H OR 8H FUSE RYHEATER RY-4WAY RY-FAN CN4WAY CNFAN CN- - LG LSC091PMA | Service Manual - Page 54
(3) DISPLAY PWB ASSEMBLY • TOP VIEW • BOTTOM VIEW PWB ASM:6871A20363 C01V C02V PWB:6870A90126A C02V C01V (4) SUB P.W.B ASSEMBLY CN-D4 1 CN-D3 1 1 CN-D3 CN-D2 CN-D4 PWB ASM:6871A20363 PWB:6870A90126A 1 CN-D2 1 CN-D6 1 1 CN-D5 1 CN-D1 1 1 CN-D1 1 CN-D5 1 1 CN-D6 CN-CON(WH) CN-12V(WH) - LG LSC091PMA | Service Manual - Page 55
SW1 RXE250 POLY SW2 ~ RXE250 44 CN-DC/DC(BL) FG1 FG2 + C07D 4 32 1 4 32 1 100uF 63V 4 32 1 4 32 1 22 11 OUTDOOR INDOOR FAN MOTOR1 CN-MOTOR1(WH) INDOOR FAN MOTOR2 CN-MOTOR2(WH) BL PK YL OR RD BL PK YL OR RD STEP MOTOR L / R 1 STEP MOTOR L / R 2 HVB ASSY ROOM-TH - LG LSC091PMA | Service Manual - Page 56
2. Outdoor Unit - 56 - CN-DC/DC 11 22 33 44 DC 5V DC 5V R81 XXX 1% ZD81 5.1V R82 6.8K 1% DC 5V R92 2.7K 1 D92 D91 1N4148 - LG LSC091PMA | Service Manual - Page 57
Exploded View and Replacement Parts List 1. Indoor Unit -57- 135312 135303 135314 249951 354210 135515 267110 268717 152312 268714-1 330870 144710-1 146811 144710-2 135500-3 146811 147581 352115 352116 35211B 352150 352380 263230 131410 - LG LSC091PMA | Service Manual - Page 58
SUB 330870 DRAIN PAN ASSEMBLY 346810 MOTOR ASSEMBLY,INDOOR 35211B TUBE ASSY,TUBING 349600 MOUNT,MOTOR 352380 AIR GUIDE 352150 HOSE ASSEMBLY,DRAIN 354210 EVAPORATOR ASSEMBLY,FIRST 359012 FAN,TURBO PART No. LSC091PMA LSC121PMA 3141A20004K 3530A10071D 3531A20069M 3531A20069N 3531A20069P - LG LSC091PMA | Service Manual - Page 59
2. Outdoor unit(9K, 12K) -59- 554031 437210 546810 559010 649950 668711 261704 W0CZZ 430410 437212 435511 552111 552202 567502 554160 553000 550140 552203-1 561410 552116 552203-3 - LG LSC091PMA | Service Manual - Page 60
List(outdoor) LOCATION No. DESCRIPTION 552203-1 VALVE,SERVICE 552203-3 VALVE,SERVICE 554031 CONDENSER ASSY,BENT 554160 COMPRESSOR SET 559010 FAN , OUTDOOR 550140 ISOLATOR, COMP PART No. LSC091PMA LSC121PMA 2H02479H 5220A20005B 2H01890L 5220A20003B 5403A20026D 5403A20019B 2520UKAC2HA - LG LSC091PMA | Service Manual - Page 61
MEMO -61- - LG LSC091PMA | Service Manual - Page 62
MEMO -62- - LG LSC091PMA | Service Manual - Page 63
P/No.: 3828A20135N July, 2003 Printed in Korea
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SERVICE MANUAL
Room Air Conditioner
MODEL : LSC091PMA
LSC121PMA