LG LS-J0766ML Service Manual Download Page 12

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Refrigeration Cycle Diagram

Pipe size(Diameter:Ø)

MAX.

Max

MODEL

Piping length

Elevation

Gas(inch)

Liquid(inch)

(m)

3/8"

1/4"

INDOOR UNIT

OUTDOOR UNIT

HEAT
EXCHANGE
(EVAPORATOR)

HEAT
EXCHANGE
(CONDENSER)

COMPRESSOR

ACCUMU
LATOR

GAS SIDE

3-WAY VALVE

LIQUID SIDE

2-WAY VALVE

CAPILLARY TUBE

CHECK VALVE

(Heating Model only)

COOLING

HEATING

REVERSING
VALVE
(Heating Model Only)

7K, 8K, 9K Btu
SERIES

Summary of Contents for LS-J0766ML

Page 1: ......

Page 2: ...on Details 13 Display Function 20 Self diagnosis Function 20 Installation 21 Operation 37 Disassembly of the parts Indoor Unit 39 2 way 3 way Valve 45 Cycle Troubleshooting Guide 52 Electronic Parts Troubleshooting Guide 53 Electronic Control Device 60 Schematic Diagram 62 Exploded View and Replacement Parts List 64 ...

Page 3: ... 4 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 Op...

Page 4: ...ing 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 without c...

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Page 9: ... Outdoor Unit W L2 L3 L1 D H L4 L5 Gas side 3 way valve Liquid side 2 way valve MODEL DIM unit W mm 564 H mm 525 D mm 265 L1 mm 294 L2 mm 66 L3 mm 374 L4 mm 17 L5 mm 270 7K Btu 8K Btu 9K Btu Cooling Only ...

Page 10: ... Outdoor Unit 9K Btu Heat Pump W L2 L3 L1 D H L4 L5 Gas side 3 way valve Liquid side 2 way valve MODEL 9K Btu Heat Pump DIM unit W mm 770 H mm 540 D mm 245 L1 mm 285 L2 mm 65 L3 mm 518 L4 mm 10 L5 mm 100 ...

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Page 12: ...inch Liquid inch m m 3 8 1 4 15 7 INDOOR UNIT OUTDOOR UNIT HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER COMPRESSOR ACCUMU LATOR GAS SIDE 3 WAY VALVE LIQUID SIDE 2 WAY VALVE CAPILLARY TUBE CHECK VALVE Heating Model only COOLING HEATING REVERSING VALVE Heating Model Only 7K 8K 9K Btu SERIES ...

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Page 15: ...or On while 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 C 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 T...

Page 16: ...urned on off according to the indoor pipe temp While in defrost control both of the indoor and outdoor fans are turned off 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 Defrost control is available 60 min later since heating mode operation started...

Page 17: ...r 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 Air Temp Fuzzy Operation for Cooling 21 C Inatake Air Temp 24 C Fuzzy Operation for Dehumidification Inatake Air Temp 21 C Fuzzy Operation for Heating If any of the operation modes among cooling dehumidification heating mode operations is carried out for 10 se...

Page 18: ...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 ...

Page 19: ...cannot be input While in cooling mode operation 30 min later since the start of the sleep timer the setting temperature increases by 1 C After another 30 min elapse it increases by 1 C again When the sleep timer mode is input while in cooling cycle mode the airflow speed of the indoor fan is set to the low When the sleep timer mode is input while in heating cycle mode the airflow speed of the indo...

Page 20: ... the memory and the appliance automatically operates in the mode on the memory The slide switch on the main unit of the appliance should be on the Auto Restarting position in order that the Auto Restarting operation is available Operation Mode that is kept on the memory State of Operation ON OFF Operation Mode Setting Temp Selected Airflow Speed Sleep Timer Mode Remaining Time of Sleep Timer unit ...

Page 21: ...ed 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 22: ... 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 Operation Indicator Timer Indicator Sleep Timer Indicator Defrost Indicator Operation Indicator Timer Indicator Sl...

Page 23: ...ibration are minimum Select a place so that the warm air and noise from the air conditioner do not disturb neighbors 2 Piping length and elevation Installation 1 Installation of indoor Outdoor unit More than A More than B More than 2 3m More than B More than 10cm More than 10cm More than 60cm More than 60cm More than 70cm Install the indoor unit on the wall where the height from the floors more th...

Page 24: ...he walls typi cally Drilling the hole through the wall for piping connections must be done safely 4 Drill a hole in the wall Drill the piping hole with a ø70mm hole core drill Drill the piping hole at either the right or the left with the hole slightly slanted to the outdoor side Installation Plate Type A screw 5 7mm 3 16 5 16 Indoor WALL Outdoor Installation plate Ø70mm Left rear piping Right rea...

Page 25: ...ng 3 Putting nut on Remove flare nuts attached to indoor and outdoor unit then put them on pipe tube having completed burr removal not possible to put them on after flaring work 4 Flaring work Firmly hold copper pipe in a die in the dimension shown in the table above Carry out flaring work using flaring tool as shown below 5 Check Compare the flared work with figure below If flare is noted to be d...

Page 26: ... so that dripping from sweating condensation will not damage furniture or floors Foamed polyethylene or equivalent is recommended 4 Indoor unit installation Hook the indoor unit onto the upper portion of the installation plate Engage the two hooks of the rear top of the indoor unit with the upper edge of the instal lation plate Ensure that the hooks are properly seat ed on the installation plate b...

Page 27: ...where they fit into the rear piping housing section 1 Route the indoor tubing and the drain hose to the required piping hole position 2 Insert the piping drain hose and the connecting cable into the piping hole For left rear piping mm inch kg m Ø6 35 1 4 1 8 Ø9 52 3 8 4 2 Ø12 7 1 2 5 5 Ø15 88 5 8 6 6 Ø19 05 3 4 6 6 Outside diameter Torque Wrench Indoor unit tubing Open end wrench fixed Connection ...

Page 28: ...h When extending the drain hose at the indoor unit install the drain pipe 7 Wrap the insulation material around the con necting 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 Wrap the area which accommodates the rear piping housing section with vinyl tape mm inch kg m Ø6 35 1 4 1 8 Ø9 ...

Page 29: ...ainst the installation plate until the hooks engage into their slots clicking sound 3 Connection of the pipes Outdoor 1 Align the center of the pipings and sufficiently tighten the flare nut by hand 2 Finally tighten the flare nut with torque wrench until the wrench clicks When tightening the flare nut with torque wrench ensure the direction for tightening follows the arrow on the wrench mm inch k...

Page 30: ...k 32k 36k 38k 1 0 1 5 2 5 2 5 5 5 Unit A Indoor Indoor Indoor Outdoor Outdoor Cable Type B H05VV F H05VV F H05VV F H05RN F H05RN F NORMAL CROSS SECTIONAL AREA Grade 7k 14k 18k 24k 28k 1 0 1 5 2 5 Cable Type B H07RN F H07RN F H07RN F NORMAL CROSS SECTIONAL AREA Grade 30k 32k 36k 38k 0 75 0 75 Cable Type B H07RN F H07RN F NORMAL CROSS SECTIONAL AREA Grade mm2 mm2 mm2 The power connecting cable conne...

Page 31: ...rom vibrations 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 percent of the rated voltage marked on the name plate 6 C...

Page 32: ...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 Tape the piping drain hose and connecting cable from down to up Secure the tapped piping along the exterior wall using saddle or equivalent 3 In cases where the Outdoor unit is installed above the Indoor unit perform the following T...

Page 33: ... the gas side pressure of optimum con dition is as below Cooling NOTE If the actual pressure is higher than shown the system is most likely over charged and charge should be removed If the actual pressure 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 Discharge temperature Discharge air Intake t...

Page 34: ...opping 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 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 t...

Page 35: ...IME 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 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 ...

Page 36: ...n air discharge louver to open position horizontally 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 Before removing the control box be sure to take out the wire screwed at the other end Display P C B Conductor Step Motor Conductor Earth Conductor Motor Conductor Sensor Cond...

Page 37: ... out from the chassis careful ly 3 To remove the Discharge Grille Unhook the discharge grille and pull the dis charge grille out from the chassis carefully 4 To remove the Evaporator Remove 3 screws securing the evaporator at the left 2EA in the Eva Holder at the right 1EA ...

Page 38: ...move 2 securing screw Pull the motor cover out from the chassis carefully 6 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 Motor cover ...

Page 39: ...ld gauge Open Open Open with charging cylinder Open Open Open with charging cylinder Open Open Open Open Works Shipping Air purging Installation Operation Pumping down Transfering Evacuation Servicing Gas charging Servicing Pressure check Servicing Gas releasing Servicing 1 2 3 4 5 6 Valve cap Open position Closed position Pin Service port Service port cap To outdoor unit Flare nut To piping conne...

Page 40: ... hexagonal wrench to press the valve core pin discharge for three seconds and then wait for one minute Repeat this three times 5 Use torque wrench to tighten the service port nut to a torque of 1 8kg cm 6 Set the 3 way valve to the back seat 7 Mount the valve stem nuts to the 2 way and 3 way valves 8 Check for gas leakage At this time especially check for gas leakage from the 2 way and 3 way valve...

Page 41: ...rge hose Open the low pressure valve on the charge set slightly to air purge from the charge hose 5 Set the 2 way valve to the closed position 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg cm2 g 7 Immediately set the 3 way valve to the closed position Do this quickly so that the gauge ends up indicating 3 to 5kg cm2 g 8 Disconnect the charge set and mo...

Page 42: ...nut on the 2 way 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 cm2 g 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 Mount...

Page 43: ...et and discharge the refrigerant until the gauge indicates 0 kg cm2 G If there is no air in the refrigerant cycle the pressure when the air conditioner is not running is higher than 1 kg cm2 G discharge the refrigerant until the gauge indicates 0 5 to 1 kg cm2 G if this is the case it will not be necessary to apply a evacuatin Discharge the refrigerant gradually if it is discharged too suddenly th...

Page 44: ...g or less 3 Close the valve Lo side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approxima tely 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 Lo Open Open Vacuum pump 2 Way valve Outdoor unit Liquid side Indoor unit Gas s...

Page 45: ...y 150g each time while operating the air conditioner in the cooling cycle however one time is not sufficient wait approximately 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 discharged If the system has been charged with liquid refrigerant while operating the air conditi...

Page 46: ...om air humidity When the room air humidity is relativery higher temperature difference is smaller When the room air humidity is relatively lower temperature 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 pressu...

Page 47: ...r ZNR01J Check the connection housing for contacting Connector related to CN TAB1 RY COMP NO 3 Connector related to CN MOTOR Connector contacting of Outdoor Fan Compressor Display PWB Assembly Check Check each load Indoor Outdoor Fan Motor Compressor Stepping Motor and contacting condition of related connector Main PCB Board Operation Check Items SMPS Transformer Indoor unit Input Voltage Output V...

Page 48: ...ery Check the contact of CN DISP1 connector 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 Mode the wind speed is set to the low speed by force Check Display PWB Assembly Voltage between CN DISP1 DC 5V Check the connecting circuit between the remote controller MICOM No R17 2Ω IR L...

Page 49: ...or Outdoor Fan is stopped Check the related circuit of RY FAN 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 Relay RY COMP for driving compre...

Page 50: ...cuit 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 7 10 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 orange and 3 yellow of CN MOTOR About AC 180V over About AC 50V over TR...

Page 51: ...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 Vertical Louver Confirm that there is DC 12V between pin RED of CN U D and GND Confirm that there is a soldering short at following terminals Between...

Page 52: ...or not about 10KΩ at 25 C Check the indoor pipe temperature is disconnected or not about 5KΩ at 25 C Turn ON Main Power Check the DC voltage on the PWB ASSEMBLY The details of check are as followings Check point Between Micom NO 59 and GND Between IC01M NO 11 and GND Comp ON DC 5V Below DC 1V Comp OFF DC 0V About DC 12V Check point Between Micom NO 51 and GND Between IC02M NO 11 and GND 4 way ON D...

Page 53: ... Power Check the electrical wiring diagram of outdoor side Check the abnormal condition for the component of Compressor Outdoor Fan Motor 4 way Check the open or short of connecting wires between indoor and outdoor ...

Page 54: ...Electronic Control Device 1 MAIN P W B ASSEMBLY AC PART TOP VIEW 1 MAIN P W B ASM AC BOTTOM VIEW ...

Page 55: ... 2 MAIN P W B ASSEMBLY DC PART TOP VIEW 2 MAIN P W B ASM DC BOTTOM VIEW ...

Page 56: ... 3 DISPLAY ASSEMBLY 6871A20194 TOP VIEW 6871A30009 TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

Page 57: ...Schematic Diagram TELEPHONE CONTROL MODEL ONLY 51 ...

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Page 60: ... INDOOR 4995A20199V 4995A20199F 4995A20199F 263230 THERMISTOR ASSY 3Q35015U 3Q35015U 3Q35015U 263230 THERMISTOR ASSEMBLY 6323A20004C 6323A20004C 6323A20004C 264110 POWER CORD ASSEMBLY 6411A20013D 6411A20013D 6411A20013D 266090 H V ASSEMBLY 6609A10003J 267110 REMOTE CONTROLLER ASSEMBLY 6711A20010E 6711A20010A 6711A20025T 268712 PWB PCB ASSEMBLY DISPLAY 6871A30009S 6871A30009S 6871A20139E 268714 1 P...

Page 61: ...0013B 159901 2 VANE HORIZONTAL 5990A30007B 5990A30014B 249951 CONTROL BOX ASSEMBLY INDOOR 4995A20184E 4995A20184E 263230 THERMISTOR ASSEMBLY 6323A20004A 6323A20004A 264110 POWER CORD ASSEMBLY 6411A20013A 6411A20013A 266090 H V ASSEMBLY 267110 REMOTE CONTROLLER ASSEMBLY 6711A20010A 6711A20025T 268712 PWB PCB ASSEMBLY DISPLAY 6871A30009S 6871A20139F 268714 1 PWB PCB ASSEMBLY MAIN AC 6871A20163B 6871...

Page 62: ... 249951 CONTROL BOX ASSEMBLY INDOOR 4995A20188E 4995A20188E 4995A20188B 4995A20188B 263230 THERMISTOR ASSY 3Q35015U 3Q35015U 3Q35015U 3Q35015U 263230 THERMISTOR ASSEMBLY 6323A20004B 6323A20004B 6323A20004A 6323A20004A 264110 POWER CORD ASSEMBLY 6411A20013B 6411A20013B 6411A20013C 6411A20013C 266090 H V ASSEMBLY 267110 REMOTE CONTROLLER ASSEMBLY 6711A20010A 6711A20025T 6711A20010A 6711A20025T 26871...

Page 63: ...2 Outdoor unit 437210 559010 437212 552111 435511 546810 430410 554031 567502 554160 550140 649950 552203 1 552203 2 W0CZZ 552116 552202 561410 552102 1 5522201 552102 2 552111 ...

Page 64: ...3 Outdoor unit 9K Btu Heat Pump 437210 546810 430410 552203 2 552203 1 554031 649950 552116 W0CZZ 437212 435511 559010 447910 567502 554160 552202 561410 550140 552102 1 552102 2 5522201 552111 ...

Page 65: ...2 Outdoor unit 552203 2 552203 1 552560 552111 552102 1 552201 552102 2 552116 561410 552202 553000 ...

Page 66: ...4681A20004F 4681A20004F 550140 ISOLATOR COMP 4H00982E 4H00982E 4H00982E 567502 O L P 6750U L013A 552102 TUBE CAPILLARY BEND 5210A20595F 5210A30151F 5210A30151F 552111 TUBE ASSEMBLY CAPILLARY 5211A20133K 5211A30082R 5211A30082R 552203 1 VALVE SERVICE 5220A20001B 2H02479H 2H02479H 552203 2 VALVE SERVICE 2H02479H 5220A20001B 5220A20001B 554031 CONDENSER ASSEMBLY BENT 5403A20045T 5403A20045B 5403A2004...

Page 67: ...81A20004H 4681A20013A 550140 ISOLATOR COMP 4H00982E 4H00982E 4H00982E 552102 TUBE CAPILLARY BEND 5424AR7208T 5424AR7208T 5210A30216V 552111 TUBE ASSEMBLY CAPILLARY 5211A20133L 5211A20133L 5425AR3847P 552203 1 VALVE SERVICE 2H02479H 2H02479H 2H02479J 552203 2 VALVE SERVICE 5220A20001B 5220A20001B 5220A20006A 554031 CONDENSER ASSEMBLY BENT 5403A20019Y 5403A20019K 5403A20022R 554160 COMPRESSOR SET 25...

Page 68: ...A20013D 550140 ISOLATOR COMP 4H00982E 4H00637A 4H00637A 552102 TUBE CAPILLARY BEND 5210A30216V 5210A20595M 5210A20595M 552111 TUBE ASSY CAPILLARY 5425AR3847P 5425AR3847X 5425AR3847X 552203 1 VALVE SERVICE 2H02479J 5220A20001C 5220A20001C 552203 2 VALVE SERVICE 5220A20006A 5220A20006A 5220A20006A 552560 MUFFLER 5256A30003C 5257A30001M 5257A30001M 554031 CONDENSER ASSY BENT 5403A20022Z 5403A20022M 5...

Page 69: ...08L 5210A30688B 5210A30216P 5210A30216Q 552102 2 TUBE CAPILLARY BEND 5424AR7208M 5210A30688C 5424AR3479Q 5424AR3479F 552116 TUBE ASSY REVERSING 5211A20116A 5211A20140C 5221AR2014Z 5211A30042E 552201 VALVE CHECK 3H01552F 3A01020H 3A01020H 552202 VALVE REVERSING 5220AR3084A 5220AR3084A 3A02027A 3A02027A 552203 1 VALVE SERVICE 2H02479H 5220A20005A 2H02479F 2A00393C 552203 2 VALVE SERVICE 2A00393U 522...

Page 70: ...May 2002 Printed in Korea ...

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