LG LS-K1820CL Service Manual Download Page 24

Page: 24 / 79

1) Fuzzy Operation for Cooling

• 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.

Compressor ON Temp => Setting Temp+0.5°C

Compressor OFF Temp => Setting Temp+0.5°C

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the

intake air temp at that time.

26°C

≤

Intake Air Temp => 25°C

24°C

≤

Intake Air Temp<26°C => Intake Air Temp+1°C

22°C

≤

Intake Air Temp<24°C => Intake Air Temp+0.5°C

18°C

≤

Intake Air Temp<22°C => Intake Air Temp

Intake Air Temp < 18°C => 18°C

• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the

Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.

• While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.

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.

Compressor ON Temp => Setting Temp+0.5°C

Compressor OFF Temp => Setting Temp+0.5°C

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the

intake air temp at that time.

26°C

≤

Intake Air Temp => 25°C

24°C

≤

Intake Air Temp<26°C => Intake Air Temp+1°C

22°C

≤

Intake Air Temp<24°C => Intake Air Temp+0.5°C

18°C

≤

Intake Air Temp<22°C => Intake Air Temp

Intake Air Temp < 18°C => 18°C

• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the

Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.

• While in Fuzzy operation, the airflow speed of the indoor fan repeats the low airflow speed or pause as in dehu-

midification operation.

3) Fuzzy Operation for Heating

• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3°C or more above the

setting temp, the compressor is turned off. When below the setting temp, the compressor is turned on.

Compressor ON Temp => Setting Temp
Compressor OFF Temp => Setting Temp + 3°C

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the

intake air temp at that time.

20°C

≤

Intake Air Temp => Intake Air Temp + 0.5°C

Intake Air Temp < 20°C => 20°C

- 24 -

Summary of Contents for LS-K1820CL

Page 1: ... CN HL HM HN LS K1861CL CM CN HL HM HN LS K1862CL CM CN HL HM HN LS K1865CL CM CN HL HM HN LS K1866CL CM CN HL HM HN LS K2460CL CM CN HL HM HN LS K2462CL CM CN HL HM HN LS K2420CL CM CN HL HM HN LS K2422CL CM CN HL HM HN LS K2621CL CM CN HL HM HN LS K2661CL CM CN HL HM HN LS K2662CL CM CN HL HM HN LS K1863DL ...

Page 2: ...g Diagram 17 Operation Details 21 Display Function 29 Self diagnosis Function 29 Installation 30 Operation 43 Disassembly of the parts Indoor Unit 45 2 way 3 way Valve 51 Cycle Troubleshooting Guide 58 Electronic Parts Troubleshooting Guide 59 Electronic Control Device 65 Schematic Diagram 67 Exploded View Replacement Parts List 69 ...

Page 3: ... 5 6 7 hours The fan is switched to intermittent or irregular operation The fan speed is automatically switched from high to low speed The louver can be set at the desired position or swing up and down automatically Indoor Unit Operation ON OFF by Remote controller Sensing the Room Temperature Room temperature control Starting Current Control Time Delay Safety Control Indoor Fan Speed Control Oper...

Page 4: ...ooling Operation Mode Heating Operation Mode Auto Operation Mode Fan Operation Mode Horizontal Airflow Direction Control Button Option Room Temperature Display Setting the Time or Timer PLASMA Option NEGATIVE ION Option ON OFF SET PLASMA CANCEL Fan Speed Selection Low Med High CHAOS High 39 C Low 11 C OFF ON OFF ON Cancel Sleep Mode Timer ON or Timer OFF 1 2 3 4 5 6 7 Off Timer Fan Operates withou...

Page 5: ...x 655 x 320 12 59 1 270 YES NO NO NO OPTION YES YES YES YES 24hr ON OFF YES L C D Wireless 1 4 6 35 1 2 12 7 YES YES 1 5 0 75mm2 1 5mm2 18 000 4 536 5 274 2 5 1Ø 220V 60Hz 14 42 40 51 1 900 8 9 52 9 47 21 60 1 080 x 314 x 181 870 x 655 x 320 12 57 870 YES NO NO NO NO NO YES YES 24hr ON OFF YES L C D Wireless 1 4 6 35 5 8 15 88 YES YES 1 5mm2 1 5mm2 18 000 4 536 5 274 19 000 4 788 5 564 2 5 1Ø 220V...

Page 6: ...12 42 39 53 1 950 1 950 8 7 8 7 53 53 9 2 2 86 20 62 1 080 x 314 x 181 870 x 655 x 320 12 59 1 270 YES YES YES YES NO YES YES YES YES 24hr ON OFF YES L C D Wireless 1 4 6 35 1 2 12 7 YES YES 1 5 0 75mm2 1 5mm2 18 000 4 536 5 274 19 000 4 788 5 564 2 5 1Ø 220 240V 50Hz 12 42 39 53 1 950 1 950 9 2 9 2 53 53 9 2 2 86 20 62 1 080 x 314 x 181 870 x 655 x 320 12 59 1 470 YES NO NO NO OPTION NO YES YES Y...

Page 7: ...20 240V 50Hz 16 42 44 54 2 670 2 610 12 2 11 9 53 53 9 0 2 635 35 83 1 080 x 314 x 181 870 x 655 x 320 12 59 1 300 YES NO NO NO OPTION YES YES YES YES 24hr ON OFF YES L C D Wireless 3 8 9 52 5 8 15 88 YES YES 2 5 0 75mm2 2 5mm2 24 000 6 048 7 032 3 5 1Ø 220V 60Hz 15 5 48 42 3 54 3 2 100 9 8 61 10 5 35 78 1 080 x 314 x 181 870 x 655 x 320 12 58 1 580 YES NO NO NO OPTION NO NO YES YES 24hr ON OFF YE...

Page 8: ... 1Ø 220 240V 50Hz 16 42 44 54 2 670 2 610 12 2 11 9 53 53 9 0 2 635 35 83 1 080 x 314 x 181 870 x 655 x 320 12 59 1 300 YES YES YES YES YES YES YES YES 24hr ON OFF YES L C D Wireless 3 8 9 52 5 8 15 88 YES YES 2 5 0 75mm2 2 5mm2 26 000 7 032 3 5 1Ø 220V 60Hz 15 5 48 42 3 54 3 2 100 9 8 61 10 5 35 78 1 080 x 314 x 181 870 x 655 x 320 12 58 1 580 YES YES YES YES NO NO YES YES 24hr ON OFF YES L C D W...

Page 9: ...5 564 2 5 1Ø 220 240V 50Hz 12 42 39 53 1 950 1 950 8 7 8 7 53 53 9 2 2 86 20 62 1 080 x 314 x 181 870 x 655 x 320 12 59 1 270 YES NO NO YES YES NO YES YES YES YES 24hr ON OFF YES L C D Wireless 1 4 6 35 1 2 12 7 YES YES 1 5 0 75mm2 1 5mm2 24 000 6 048 7 032 2 5 1Ø 220 240V 50Hz 16 42 44 54 2 470 11 3 52 9 7 35 83 1 080 x 314 x 181 870 x 655 x 320 12 57 1 520 YES NO NO YES YES NO NO NO YES YES 24hr...

Page 10: ... 7 032 3 5 1Ø 220V 60Hz 16 48 44 3 55 3 2 525 2 525 12 0 12 0 70 70 9 5 2 78 35 78 1 080 x 314 x 181 870 x 655 x 320 12 65 1 610 YES NO NO YES YES YES YES YES 24hr ON OFF YES L C D Wireless 1 4 6 35 5 8 15 88 YES YES 2 5 0 75mm2 2 5mm2 18 000 4 536 5 274 2 5 1Ø 220V 60Hz 14 42 40 51 1 900 8 9 52 9 47 21 60 1 080 x 314 x 181 870 x 655 x 320 12 57 870 YES NO NO YES NO NO YES YES 24hr ON OFF YES L C ...

Page 11: ... 1Ø 220 240V 50Hz 16 42 44 54 2 670 2 610 12 2 11 9 53 53 9 0 2 635 35 83 1 080 x 314 x 181 870 x 655 x 320 12 59 1 300 YES YES YES YES YES YES YES YES 24hr ON OFF YES L C D Wireless 3 8 9 52 5 8 15 88 YES YES 2 5 0 75mm2 2 5mm2 26 000 7 032 3 5 1Ø 220V 60Hz 15 5 48 42 3 54 3 2 100 9 8 61 10 5 35 78 1 080 x 314 x 181 870 x 655 x 320 12 58 1 580 YES YES YES YES NO NO YES YES 24hr ON OFF YES L C D W...

Page 12: ... Indoor Unit 12 Dimensions Tubing hole cover Tubing hole cover Installation plate D W H W H Tubing hole cover Tubing hole cover Installation plate D MODEL ALL MODELS DIMENSION W mm 1 080 H mm 314 D mm 181 ...

Page 13: ...10 L11 L4 L5 H Gas side 3 way valve Liquid side 2 way valve 2 Outdoor Unit MODEL DIM W mm 870 H mm 655 D mm 320 L1 mm 370 L2 mm 340 L3 mm 25 L4 mm 630 L5 mm 25 L6 mm 546 L7 mm 162 L8 mm 162 L9 mm 54 L10 mm 74 5 L11 mm 79 ALL MODELS ...

Page 14: ...E EVAPORATOR HEAT EXCHANGE CONDENSER HEAT EXCHANGE CONDENSER COMPRESSOR COMPRESSOR ACCUMU LATOR GAS SIDE GAS SIDE 3 WAY VALVE LIQUID SIDE LIQUID SIDE 2 WAY VALVE CAPILLARY TUBE CAPILLARY TUBE CHECK VALVE Heating Model only COOLING HEATING REVERSING VALVE Heating Model Only 1 Cooling Only Models 2 Cooling Heating Models ...

Page 15: ...10 L11 L4 L5 H Gas side 3 way valve Liquid side 2 way valve 2 Outdoor Unit MODEL DIM W mm 870 H mm 655 D mm 320 L1 mm 370 L2 mm 340 L3 mm 25 L4 mm 630 L5 mm 25 L6 mm 546 L7 mm 162 L8 mm 162 L9 mm 54 L10 mm 74 5 L11 mm 79 ALL MODELS ...

Page 16: ...ers Numerical value in is for Rotary Comp model CAUTION Outdoor unit Indoor unit A B A Oil trap Outdoor unit Indoor unit B In case more than 5m 18K 60Hz 5 8 1 4 5 10 20 20 18K 50Hz 1 2 1 4 5 15 30 30 24K 60Hz 5 8 1 4 5 15 30 30 24K 50Hz 5 8 3 8 5 15 30 30 Pipe Size Capacity Btu h GAS LIQUID Additional Refrigerant g m Max Length A m Max Elevation B m Standard Length m ...

Page 17: ...PLAY PCB ASM POWER TO OUTDOOR UNIT PILLAR TERMINAL BR BL GN YL BR BL GN YL 1 L 2 N 3 4 BL CN U D STEP MOTOR CN L R STEP MOTOR WH ION H V B GN GN YL OPTION 3854A90003J INDOOR WIRING DIAGRAM CN DISP1 CN U D FUSE AC250V T2A CN TH1 SSR SH CAPA BR GN YL BL BR YL OR BK CN TAB1 CN TAB2 CN 4WAY RY COMP ZNR RY 4WAY RY FAN CN MOTOR THERMISTOR FORCED OPERATION AUTO RESTART REMOTE CONTROL STEP MOTOR CN L R ST...

Page 18: ... BR BL GN YL BR BL GN YL 1 L 2 N 3 4 BL CN U D STEP MOTOR CN L R STEP MOTOR RD H V B A CL OPTION BK BK BK BK BK BK LIMIT S W 3854A90003V INDOOR WIRING DIAGRAM CN DISP1 CN U D FUSE AC250V T2A CN TH1 SSR SH CAPA BR GN YL BL BR YL OR BK CN TAB1 CN TAB2 CN 4WAY RY COMP ZNR RY 4WAY RY FAN CN MOTOR THERMISTOR FORCED OPERATION AUTO RESTART REMOTE CONTROL STEP MOTOR MOTOR MAIN PCB ASM DISPLAY PCB ASM POWE...

Page 19: ...YL 1 L 2 N 2 Outdoor Unit 1 LS K1820 1860 1861 1862 2420 2422 2460 2462 2621 2622 2661 2662CL CM CN CN LS K1863DL 2 LS K1820 1822 1865 1866 HL HM HN 3854A90003K OUTDOOR WIRING DIAGRAM TO OUTDOOR UNIT TERMINAL BLOCK CAPACITOR PTC BR BL RD BK GN YL GN YL BR BL RD BK GN YL 1 L 2 N 3 4 COMP FAN MOTOR BR H C F R S C RD T B 1 BR OR BK RD YL BK YL T B 2 REVERSING VALVE ...

Page 20: ...0 3854A90003M OUTDOOR WIRING DIAGRAM TO OUTDOOR UNIT TERMINAL BLOCK CAPACITOR PTC BR BL RD BK GN YL GN YL BR BL RD BK GN YL 1 L 2 N 3 4 COMP FAN MOTOR BR H C F R S C RD RD BR T B 3 T B 4 HEATER RD T B 1 BR OR BK RD BK RD YL BK YL T B 2 REVERSING VALVE ...

Page 21: ...ile in timer mode on off off when timer mode is completed or canceled Defrost Indicator Off except when hot start during heating mode operation or while in defrost control Cooling Mode Operation When the intake air temperature reaches 0 5 CC below the setting temp the compressor and the outdoor fan stop When it reaches 0 5 C above the setting temp they start to operate again Compressor ON Temp Set...

Page 22: ...control is carried out according to the following priority order while in heating mode operation 1st priority Defrost control is carried out according to the indoor pipe temp 60 min later since heating mode operation started 2nd priority The temp differences between the indoor pipe temp and the intake air temp 25 min later T1 and 60 min later T2 since heating mode operation started are measured th...

Page 23: ...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 Setting Temp 0 5 C At the beginning of Fuzzy mode operation the setting temperature is automatically selected according to the intake air temp at that time 26 C Intake Air Temp 25 C 24 C Intake Air Temp 26 C Intake Air Temp 1 C 22 C Intake Air Temp 24 C Inta...

Page 24: ...mpressor 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 Setting Temp 0 5 C At the beginning of Fuzzy mode operation the setting temperature is automatically selected according to the intake air temp at that time 26 C Intake Air Temp 25 C 24 C Intake Air Temp 26 C Intake Air Temp 1 C 22 C Intake Air Temp ...

Page 25: ... appliance is on pause at the time set by the timer the pause continues Off Timer On Timer Operation When the set time is reached after the on off time is input by the remote controller the on off timer operation is carried out according to the set time Off Timer Operation Simple LCD Remote Controller When the set time is reached after 1 2 3 4 5 6 7 0 cancel hr is input by the remote controller wh...

Page 26: ...When it is input while in the other mode operation cooling dehumidification ventilation the Jet Cool mode is operated In the Jet Cool mode the indoor fan is operated at super high speed for 30 min at cooling mode operation In the Jet Cool mode operation the room temperature is controlled to the setting temperature 18 C When the sleep timer mode is input while in the Jet Cool mode operation the Jet...

Page 27: ...position is switched from the forced operation position to the Auto Restarting position or the remote control position the forced operation is canceled and the appliance stops operating The forced operation is carried out in cooling mode with the setting temperature 22 C and the high speed of air flow In the forced operation mode the indoor fan is operated at low speed for around 15 sec and then t...

Page 28: ...Operation Thermistor Error Indicator When the indoor pipe sensor or the room temperature sensor is open or is shorted the error is indicated To indicate the error the operation LED or the cooling LED flashed at 3 sec interval When the error is cleared the LED stops flashing the operation or cooling LED is on While in appliance pause the error is not indicated Since the airflow quantity and speed a...

Page 29: ...of the evaporator pipe from frosting If the temperature of the indoor pipe is below 0 C after 7 minutes from starting the compressor the compressor and outdoor fan is stopped and then after 3 minutes delay of operating of the compressor when the tempera ture of the indoor pipe is over 7 C the compressor and the outdoor fan is reoperated Operation Indicator Timer Indicator Sleep Timer Indicator Dei...

Page 30: ... the air conditioner weight into account and select a place where noise and vibration are min imum Select a place so that the warm air and noise from the air conditioner do not disturb neighbors Rooftop Installations If the outdoor unit is installed on a roof structure be sure to level the unit Ensure the roof structure and anchoring method are adequate for the unit location Consult local codes re...

Page 31: ...s also important to use caution concerning the location of the installation plate routing of the wiring to power outlets is through the walls typically Drilling the hole through the wall for piping con nections must be done safely 5 7mm 0 2 0 3 Indoor WALL Outdoor Installation Plate Marking off line Thread Weight Type A screw D C Right rear piping Left rear piping Hole center ø70mm 4 Drill a hole ...

Page 32: ...tached to indoor and out door unit then put them on pipe tube having completed burr removal not possible to put them on after flaring work Copper pipe 90 Slanted Uneven Rough Bar Copper pipe Clamp handle Red arrow mark Cone Yoke Handle Bar A Pipe Reamer Point down 4 Flaring work Carry out flaring work using flaring tool as shown below Firmly hold copper pipe in a die in the dimension shown in the ...

Page 33: ...e installation plate until the hooks engage into their slots clicking sound 3 Tape the tubing drain hose and the connecting cable Be sure that the drain hose is located at the lowest side of the bundle Locating at the upper side can cause drain pan to overflow inside the unit 5 Connecting the pipings to the indoor unit and drain hose to drain pipe Align the center of the pipings and sufficiently t...

Page 34: ...ape wide Wrap with vinyl tape Indoor unit pipe Pipe Torque wrench Indoor unit tubing Spanner fixed Connection p Flare nut Vinyl tape narrow Adhesive Drain pipe Indoor unit drain hose When extending the drain hose at the indoor unit install the drain pipe Tighten the flare nut with a wrench 18K 24K 26K 1 2 5 5kg m 1 4 1 8kg m 5 8 6 6kg m 3 8 4 2kg m Pipe Size Torque Capacity Btu h GAS LIQUID Wrap t...

Page 35: ...re nut by hand Tighten the flare nut with a wrench 7 Wrap the insulation material around the connect ing portion Overlap the connection pipe heat insulation and the indoor unit pipe heat insulation material Bind them together with vinyl tape so that there is no gap Plastic bands Insulation material Vinyl tape narrow Connection pipe Connecting cable Indoor unit piping Pipe Vinyl tape wide Wrap with...

Page 36: ...sis with the tubing holder Hook the edge of tubing holder to tap on chassis and push the bottom of tubing holder to be engaged at the bottom of chassis 10 Indoor unit installation Remove the spacer Ensure that the hooks are properly seated on the installation plate by moving it left and right Drain hose Connecting cable Piping for passage through piping hole Tubing holder Hook 1 Push 2 Drain hose ...

Page 37: ... cable connected to the indoor and outdoor unit should be complied with the following specifications Type H07RN F approved by HAR or SAA The connecting cable connected to the indoor and outdoor unit should be complied with the following specifications Type H07RN F approved by HAR or SAA Cooling model Heat pump model Color of Wires Color of Wires Color of Wires Color of Wires The length of the powe...

Page 38: ...casing of electrical fittings are liable to come loose from vibra tions to which the unit is subjected during the course of transportation Check them and make sure that they are all tightly fastened If they are loose it could cause burn out of the wires 3 Specification of power source 4 Confirm that electrical capacity is sufficient 5 See to that the starting voltage is maintained at more than 90 ...

Page 39: ...aped piping along the exterior wall Form a trap to prevent water entering the room Fix the piping onto the wall by saddle or equiva lent Seal a small opening around the pipings with gum type sealer Trap Trap 1 Checking the drainage 1 To remove the front panel from the indoor unit remove the front panel from the indoor unit cabi net Set the air direction louvers up and down to the position horizont...

Page 40: ...ry nitrogen gas cylinder to this ser vice port with charge hoses Pressurize the system to no more than 150 P S I G with dry nitrogen gas and close the cylinder valve when the gauge reading reached 150 P S I G Next test for leaks with liquid soap Lo Hi Indoor unit Outdoor unit Manifold valve Charge hose Nitrogen gas cylinder in vertical standing position Pressure gauge Do a leak test of all joints ...

Page 41: ...ure ly with an adjustable wrench This process is very important to prevent leakage from the sys tem Replace the valve caps at both gas and liquid side service valves and fasten them tight This completes air purging with a vacuum pump The air conditioner is now ready to test run 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 ...

Page 42: ...arge should be removed If the actual pres sure are lower than shown the system is most likely undercharged and charge should be added The air conditioner is now ready for use Bolt Tubing connection Outside ambient TEMP The pressure of the gas side service valve 35 C 95 F 4 5 5 5kg cm2 G 63 9 78 1 P S I G This is performed when the unit is to be relocated or the refrigerant circuit is serviced Pump...

Page 43: ...me is obtained and to cancel the Timer operation SLEEP MODE AUTO BUTTON Used to set Sleep Mode Auto operation AIR CIRCULATION BUTTON Used to circulate the room air without cooling or heating turns indoor fan on off ROOM TEMPERATURE CHECKING BUTTON Used to check the room temperature PLASMA OPTION Used to start or stop the plasma purification function NEGATIVE ION OPTION Used to generate negative io...

Page 44: ...s obtained and to cancel the Timer operation SLEEP MODE AUTO BUTTON Used to set Sleep Mode Auto operation AIR CIRCULATION BUTTON Used to circulate the room air without cooling or heating turns indoor fan on off ROOM TEMPERATURE CHECKING BUTTON Used to check the room temperature PLASMA OPTION Used to start or stop the plasma purification function NEGATIVE ION OPTION Used to generate negative ion HO...

Page 45: ...rizontally by finger pressure Remove the securing screws To remove the Grille pull the lower left and right side of the grille toward you slightly tilted and lift it straight upward 1 To remove the sensor housing connect earth conductor step motor conductor with sensor holder Motor Evaporator P C B Screw 3EA Power Conductor Step Motor Conductor Earth Conductor Motor Conductor Sensor Conductor LS K...

Page 46: ... 3 To remove the Discharge Grille Remove the securing screw Pressing the right side of the discharge grille downward slightly unhook the discharge grille Pull the discharge grille out from the chassis carefully 4 To remove the Evaporator Remove 3 screws securing the evaporator at the left 1EA at the right 2EA ...

Page 47: ...the tab is clear of the slot 5 To remove the Cross Flow Fan Loosen the screw securing the cross flow fan to the fan motor do not remove Lift up the right side of the cross flow fan and the fan motor separate the fan motor from the cross flow fan Remove the left end of the cross flow fan from the self aligning bearing ...

Page 48: ...d and lift it straight upward To remove the Grille from the Chassis LS K1862CL CM HL HM LS K2462CL CM HL HM LS K2464CL CM HL HM Remove the cover control from the grille Separate the black lead wire from the white connector Remove screws secured 3 EA Pull the grille out from the chassis carefully 1 To remove the sensor housing connect earth conductor step motor conductor with sensor holder Motor Ev...

Page 49: ...o remove the Discharge Grille Remove the securing screw Pressing the right side of the discharge grille downward slightly unhook the discharge grille Pull the discharge grille out from the chassis carefully 4 To remove the Evaporator Remove 3 screws securing the evaporator at the left 1EA at the right 2EA 49 ...

Page 50: ... tab is clear of the slot 5 To remove the Cross Flow Fan Loosen the screw securing the cross flow fan to the fan motor do not remove Lift up the right side of the cross flow fan and the fan motor separate the fan motor from the cross flow fan Remove the left end of the cross flow fan from the self aligning bearing 50 ...

Page 51: ...g down Closed Open Open Transfering clockwise counter clockwise connected manifold gauge Evacuation Open Open Open Servicing with vacuum pump Gas charging Open Open Open Servicing with charging cylinder Pressure check Open Open Open Servicing with charging cylinder Gas releasing Open Open Open Servicing with charging cylinder 1 2 3 4 5 6 Valve cap Open position Closed position Pin Service port Ser...

Page 52: ...ely 90 wait 10 seconds and then set it to closed position Be sure to use a hexagonal wrench to operate the valve stem 3 Check for gas leakage Check the flare connections for gas leakage 4 Purge the air from the system Set the liquid side valve to the open position and remove the cap from the gas side valve s service port Using the hexagonal wrench to press the valve core pin discharge for three se...

Page 53: ...Open the low pressure valve on the charge set slightily to air purge from the charge hose 5 Set the liquid side valve to the closed position 6 Operates the air conditioner in cooling mode and stop it when the gauge indicates 1kg cm2g 7 Immediately set the 3 way valve to the closed posi tion Do this quickly so that the gauge ends up indicat ing 3 to 5kg cm2g 8 Disconnect the charge set and mount th...

Page 54: ...lare nut on liquid side valve 4 Check for gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the gas cylinder and discharge the refrigerant until the gauge indicates 3 to 5 kg cm2g 6 Disconnect the charge set and the gas cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7...

Page 55: ...osed Connect the charge hose to the service port 3 Open the valve Lo side on the charge set and dis charge the refrigerant until the gauge indicates 0 kg cm2G If there is no air in the refrigerant cycle the pres sure when the air conditioner is not running is high er than 1 kg cm2G discharge the refrigerant until the gauge indicates 0 5 to 1 kg cm2G if this is the case it will not be necessary to ...

Page 56: ... mmHg or less 3 Close the valve Lo side on the charge set turn off the vacuum pump and confirm that the gauge nee dle does not move approximately 5 minutes after turning off the vacuum pump 4 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed 56 Lo Open Open Vacuum pump 2 Way valve Outdoor unit Liquid side Indoor uni...

Page 57: ...0g each time while operating the air conditioner in the cooling cycle however one time is not sufficient wait approxi mately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the gas to be dis charged If the system has been charged with liquid refriger ant while operating the air conditio...

Page 58: ...room air humidity When the room air humidity is relativery higher temperature difference is smaller When the room air humidity is relatively lower tem perature difference is larger 2 Check temperature and pressure of refrigeration cycle Notice 1 The suction pressure is usually 4 5 6 0 kg cm2 G Cooling at normal condition 2 The temperature can be measured by attaching the thermometer to the low pre...

Page 59: ... housing for contacting Connector related to CN TAB1 CN TAB2 Connector related to CN MOTOR Connector contacting of Outdoor Fan Compressor Display PWB Ass y Check Check each load Indoor Outdoor Fan Motor Compressor Stepping Motor and contacting condition of related connector PCB Board Operation Check Items Power Transformer Outdoor unit Input Voltage Output Voltage IC01D 7812 Output Indoor Outdoor ...

Page 60: ...sor 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 Mode the wind speed is set to the low speed by force Check DISP PWB Ass y Voltage between CN DISP1 DC 5V When the detect switch double key inside the remote controller door is fault it is impossible to operate temperature regulating and wind speed se...

Page 61: ...Check the related circuit of R02H 12 1K R01H 1 0K R04H 6 2K R03H 1 0K Micom No 3 4 Indoor unit Check the indoor temperature sensor is disconnected or not About 10kΩ at 25 C Turn off Main Power Check the electrical wiring diagram of outdoor side Check the abnormal condition for the component of Compressor Outdoor Fan Motor Check the open or short of conmecting wires between indoor and outdoor Check...

Page 62: ...uit of indoor Fan Motor The pin NO 63 of Micom and the part for driving TRIAC the input and output signal of IC01M PIN NO 2 15 Check the pattern Check the TRIAC TRIAC Open Indoor Fan Motor never operate TRIAC short Indoor Fan Motor always operates in case of ON or OFF 4 When indoor Fan does not operate The voltage of PIN NO 1 blue and 3 yellow of CN MOTOR About AC 180V over About AC 50V over TRIAC...

Page 63: ...n rotating the Vertical Louver with hands Normal Check the connecting condition of CN U D Connector Check the soldering condition on PWB of CN U D Connector 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 5 When Vertical Louver does not operate Check the operating circuit of the Vertic...

Page 64: ...2 and GND Between IC01M NO 14 and GND Comp ON DC 5V Below DC 1V Comp OFF DC 0V About DC 12V Check point Between Micom NO 54 and GND Between IC02M NO 16 and GND 4 way ON DC 5V Below DC 1V 4 way OFF DC 0V About DC 12V Check point Between Micom NO 53 and GND Between IC02M NO 15 and GND Fan ON DC 5V Below DC 1V Fan OFF DC 0V About DC 12V Comp Relay 4 way Relay Outdoor fan Relay Turn off Main Power Che...

Page 65: ...5HL HM HN 6871A10055U 91K 91K 3K 3K 1K 3K 12 LS K2420CL CM CN 6871A10001R 6 8K OPEN SHORT 6 8K 6 8K 12K 13 LS K2420HL HM HN 6871A10001S 91K 5 1K 12K 5 1K 6 8K 6 8K 14 LS K2621CL CM CN 6871A10001V 6 8K OPEN SHORT 6 8K 6 8K 12K 15 LS K2621HL HM HN 6871A10001W 91K 5 1K 12K 5 1K 6 8K 6 8K 16 LS K2460CL CM CN 6871A10001K 6 8K OPEN SHORT 6 8K 2K SHORT 17 LS K2460HL HM HN 6871A10001L 91K SHORT SHORT 6 8K...

Page 66: ... 66 2 Display Ass y No Model P No Remark 1 18K 24K 26K 6871A30009D 2 LS K1863DL 6871A30009R ...

Page 67: ... 67 Schematic Diagram Cooling Only Series ...

Page 68: ... 68 Heat Pump Series ...

Page 69: ...ded View Replacement Parts List 152302 249951 264110 267110 354212 733010 131410 135311 135314 135312 147581 1 147581 2 152313 359011 263230 268712 268714 W0CZZ 1 146811 352150 35211B 346810 342800 1 Indoor Unit ...

Page 70: ...1159Z 3H02255W 3H03462D 3H03462D 3H03462D 267110 REMOTE CONTROLLER ASSY 6711A20003B 6711A20003R 6711A20003C 6711A20003B 6711A20010A 6711A20003C 268712 PWB PCB ASSY DISPLAY 6871A30009R 6871A30009R 6871A30009R 6871A30009R 6871A30009R 6871A30009R 268714 PWB PCB ASSY MAIN 6871A10020K 6871A10026B 6871A10026J 6871A10020W 6871A10001K 6871A10026C 342800 BEARING 3H02821B 3H02821B 3H02821B 3H02821B 3H02821B...

Page 71: ...55W 3H02255W 3H03462D 3H03462D 3H03462D 267110 REMOTE CONTROLLER ASSY 6711A20003A 6711A20010B 6711A20010B 6711A20003D 6711A20003B 6711A20003A 6711A20003D 268712 PWB PCB ASSY DISPLAY 6871A30009R 6871A30009R 6871A30009R 6871A30009R 6871A30009R 6871A30009R 6871A30009R 268714 PWB PCB ASSY MAIN 6871A10026F 6871A10020F 6871A10020F 6871A10020G 6871A10020W 6871A10020A 6871A10020S 342800 BEARING 3H02821B 3...

Page 72: ...A 6323A20003A 6323A20003A 6323A20003A 264110 POWER CORD ASSY 3H02255W 3H02255W 3H03462D 3H03462D 3H03462D 3H02255W 267110 REMOTE CONTROLLER ASSY 6711A20010M 6711A20010M 6711A20010M 6711A20010E 6711A20010M 6711A20010A 268712 PWB PCB ASSY DISPLAY 6871A30009R 6871A30009R 6871A30009R 6871A30009R 6871A30009R 6871A30009R 268714 PWB PCB ASSY MAIN 6871A10026P 6871A10026L 6871A10026V 6871A10026D 6871A10026...

Page 73: ...OTE CONTROLLER ASSY 6711A20010N 6711A20028D 6711A20028D 6711A20010N 6711A20010F 6711A20010N 268712 PWB PCB ASSY DISPLAY 6871A30009R 6871A30009R 6871A30009R 6871A30009R 6871A30009D 6871A30009R 268714 PWB PCB ASSY MAIN 6871A10026Q 6871A10020H 6871A10020H 6871A10026W 6871A10020U 6871A10026U 342800 BEARING 3H02821B 3H02821B 3H02821B 3H02821B 3H02821B 3H02821B 346810 MOTOR ASSY INDOOR 4681A20003B 4681A...

Page 74: ... 74 3 Outdoor Unit 552111 435511 649950 552203 1 552116 552203 2 554160 550140 552560 447910 552202 561410 552102 1 552201 552102 2 435512 559010 437210 430411 546810 W0CZZ 2 554031 437212 ...

Page 75: ... 4H00637A 4022U L004A 552203 1 VALVE SERVICE 2H02479F 2H01890K 2H01890K 2A00392K 2A00392K 2A00392K 2A00392K 552203 2 VALVE SERVICE 2A00392E 2H02479F 2H02479F 2H02479F 2A00393C 2A00393C 2H02479F 554031 CONDENSER ASSEMBLY BENT 5402AR2347H 5402AR2347H 5402AR2347H 5402AR2347D 5402AR2347D 5402AR2347D 5402AR2347D 554160 COMPRESSOR 5416A20003D 2A00715N 2A00715N 2A00715M P2A00715P P2A00715P 2A00715M 55901...

Page 76: ...8S 5425AR2448G 5425AR2448G 552116 TUBE ASSY REVERSING 5211A30042A 5221AR2938C 5221AR2014M 5221AR2938D 5221AR2938D 5221AR2938G 5221AR2938G 552201 VALVE CHECK 3A01020H 3A01020H 3A01020H 3A01020H 3A01020H 3A01020H 3A01020H 552202 VALVE REVERSING 3A02027A 3A02027A 3A02027A 3A02027A 3A02027A 3A02027A 552203 1 VALVE SERVICE 2A00392E 2H01890P 2A00392E 2A00392E 2A00392E 2H01890D 2H01890D 552203 2 VALVE SE...

Page 77: ...TOR ASSEMBLY OUTDOOR 4681A20013A R 550140 ISOLATOR COMP 4H00637A R 552102 TUBE CAPILLARY BEND 5210A30216H R 552111 TUBE ASSY CAPILLARY 5425AR3847F R 552203 1 VALVE SERVICE 2H01890P R 552203 2 VALVE SERVICE 2H02479F R 554031 CONDENSER ASSEMBLY BENT 5403A20022P R 554160 COMPRESSOR ASSEMBLY 2A00713E R 559010 FAN ASSEMBLY PROPELLER 1A00195B R 649950 CONTROL BOX ASSEMBLY OUTDOOR 4995A20022X R W0CZZ CAP...

Page 78: ... 78 Memo ...

Page 79: ...P NO 3828A30033D March 2003 Printed in Korea ...

Search results

Summary of Contents for LS-K1820CL

Reviews:

Related manuals for LS-K1820CL

Brands by name

Popular brands

LG LS-K1820CL, Service Manual

Search results

Summary of Contents for LS-K1820CL

Reviews:

Related manuals for LS-K1820CL

Brands by name

Popular brands