LG LM-2320C2L/M Service Manual Download

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1. Product does not operate at all.

(* Refer to Electronic Control Device drawing and Schematic diagram.)

Electronic Parts Troubleshooting Guide

Turn off Main Power

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 220V/AC240V, 50Hz)

• Main power's voltage
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting

cable

• Check PWB Ass'y

- Fuse
- Pattern damage
- Varistor(ZNR01J)

Check the connection housing for contacting

• Connector related to CN-POWER
• Display PWB Ass'y Check
• Connector related to CN-TAB1,

Compressor

Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor etc.) and contacting
condition of related connector

PCB Board Operation Check

Items

• Power Transformer

(Outdoor unit)
- Input Voltage
- Output Voltage

• IC01D(7812) Output

(Indoor/Outdoor unit)

• IC02D(7805) Output

(Indoor/Outdoor unit)

• IC01A(KIA7036, Reset IC)

X01(8MHz)

• Replace Trans

• Replace IC01D

• Replace IC02D

• Replace faulty parts

- About AC220V/240V±10% - Check the power voltage
- About AC14±3V

• DC +12V

• DC +5V

• Voltage of Micom No. 2,

(DC +4.5V over) and Soldering condition.

Content

Remedy

YES

(After 10 seconds)

Summary of Contents for LM-2320C2L/M

Page 1: ...Multi Type Room Air Conditioner SERVICE MANUAL MODEL LM 2320C2L M ...

Page 2: ...10 Display Function 14 Self diagnosis Function 14 Installation 15 Operation 29 Disassembly of the parts Indoor Unit 31 2 way 3 way Valve 33 Cycle Troubleshooting Guide 37 Electronic Parts Troubleshooting Guide 38 Electronic Control Device 44 Schematic Diagram 45 Exploded View and Replacement Parts List 46 2 Contents ...

Page 3: ...ed to low Cooling speed The unit will be stopped after 1 2 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 C...

Page 4: ...om Temperature Display Setting the Time or Timer Airflow Direction Control Operation ON OFF Temperature Setting TEMPERATURE LOW HIGH Timer Selection ON OFF Timer Setting SET Timer Cancel CANCEL Reset Fan Speed Selection Low Med High CHAOS High 39 C LOW 11 C Down to 18 C Up to 30 C Cooling OFF ON OFF ON Cancel Sleep Mode Timer ON or Timer OFF 1 2 3 4 5 6 7 Off Timer Fan Operates without cooling ...

Page 5: ...door A B 9 7 Outdoor 56 1 230 1 120 O L C D Wireless Liquid 1 4 6 35 Gas 1 2 12 7 3 8 9 52 O O Operation A Unit Only A Unit B Unit B Unit Only Unit Item Cooling Capacity Btu h kcal h Moisture Removal ℓ h Power Source ø V Hz Air Circulation m3 min Noise Level dB A Input W Runnig Current A E E R Btu h w Motor Output W Dimensions W x H x D mm Net Weight kg Refrigerant R 22 at 7 5m g Airflow Direction...

Page 6: ...ation plate Right rear piping Left rear piping ø70mm ø70mm 50mm 20mm 20mm 80mm A A ø70mm Center Center ø70mm Left rear piping Right rear piping A A D H W Tubing hole cover W mm 802 888 H mm 262 287 D mm 165 170 B Unit 9K A Unit 14K MODEL DIM 9K 9K 14K 14K ...

Page 7: ...0 L10L10 L8 Gas side 3 Way valve Liquid side 2 Way valve L7 L5 L6 2 Outdoor Unit W mm 870 H mm 655 D mm 320 L1 mm 370 L2 mm 25 L3 mm 630 L4 mm 25 L5 mm 546 L6 mm 160 L7 mm 160 L8 mm 64 L9 mm 76 5 L10 mm 50 LM 2320C2L M MODEL DIM ...

Page 8: ...ameter inch Max piping length m Max piping elevation m Gas Liquid 3 8 1 2 1 4 10 15 5 7 ex Capillary Cooling A UNIT B UNIT CAPILLARY TUBE LIQUID SIDE 2 WAY VALVE GAS SIDE 3 WAY VALVE HEAT EXCHANGER EVAPORATOR HEAT EXCHANGER CONDENSER COMPRESSOR B COMPRESSOR A ...

Page 9: ...OTOR THERMISTOR FORCED OPERATION AUTO RESTART REMOTE CONTROL STEP MOTOR MOTOR MAIN PCB ASM DISPLAY PCB ASM TO OUTDOOR UNIT PILLAR TERMINAL BR BL YL GN YL 1 L 2 N 3 RY COMP 4 3 TO INDOOR UNIT 3854AP7050H MAIN POWER B UNIT A UNIT OUTDOOR WIRING DIAGRAM 1 L 1 L 2 N 1 L 2 N 2 N WH WH BK BK 8 7 1 3 6 C NC BK BK BK BK BK CAPACITOR BR O L P O L P T B 4 T B 1 T B 3 T B 2 BL BL BR BL BL WH OR OR MOTOR POWE...

Page 10: ...t by the remote control While in compressor not running operating with the low airflow speed regardless of the setting Healthy Dehumidification Mode When the dehumidification operation input by the remote control is received the intake air temperature is detected and the setting temp is automatically set according to the intake air temperature 26 C Intake Air Temp 25 C 24 C Intake Intake Air Temp ...

Page 11: ...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 input It is off when the time set by the timer is reached If the appliance is operating at the time set by the timer the operation continues Off Timer Operation When the set time is reached after the time is input by the remote control the appliance stops operating...

Page 12: ...iance 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 of hour If no input by the remote control or no switching of the slide switch within 7 hr after the appliance operates by th...

Page 13: ...pipe from frosting When the indoor pipe temp is 7 C or higher after 3 min pause of the compressor the compressor and the outdoor fan is turned on according to the condition of the room temperature Buzzer Sounding Operation When the appliance operation key is input by the remote control the short beep beep sounds When the appliance pause key is input by the remote control the long beep sounds When ...

Page 14: ...rror code is different from Model Operation Indicator Timer Indicator Sleep Timer Indicator Compressor on Indicator 14 OUT DOOR 1 once once twice twice 5times once twice 3times 3sec 3sec 3sec 3sec 3sec 3sec 3sec 3sec 3sec 3sec 3sec 2 3 5 12 Error Code Error LED Indoor body operation LED Error contents SVC check point Indoor suction temperature thermistor open short Indoor pipe temperature thermist...

Page 15: ...ed A place where noise prevention is taken into consideration Do not install the unit near the door way Ensure the spaces indicated by arrows from the wall ceiling fence or other obstacles 2 Outdoor unit If an awning is built over the unit to prevent direct sunlight or rain exposure be careful that heat radiation from the condenser is not restricted There should not be any animals or plants which ...

Page 16: ...hole with 70mm dia holecore drill Line according to the arrows marked on lower the left and the rght side of the Installation Plate The meeting point of the extended line is the center of the hole Drill the piping hole at either the right or the left and the hole should be slightly slant to the out door side Installation Plate marking off line Thread Weight Type A screw ø70mm ø70mm 5 7mm A A A A ø...

Page 17: ... pipes Some refrgerant gas may leak when the flare nuts are removed from the indoor unit as some gas is charged to prevent the inside of the pipe from rusting Fit the copper pipe end into the Bar of flare tool about 0 0 5mm higher See illustration Flare the pipe ends 4 Tape the flaring portion to protect it from the dust or damages 90 Slanted Pipe cutter Rough Reamer Pipe Point down A Bar Copper p...

Page 18: ...onnect the cable to the indoor unit Make a small loop with the cable for easy con nection later 5 Tape the tubing drain hose and the connecting cable Be sure that drain hose locates at the low est side of the bundle Locating at the upper side can be a reason that drain water overflows drain pan inside the unit Installation plate Pull Pull To remove the holder press the bottom of the chassis near t...

Page 19: ...y moving it in left and right 7 Connecting the pipings to the indoor unit Align the center of the pipings and sufficiently tighten the flare nut with fingers Finally tighten the flare nut with torque wrench until the wrench clicks Wrench tightening the flare nut with forque wrench ensure the direction for tightening fol lows the arrows on the wrench 8 Wrap the insulation material around the con ne...

Page 20: ...door unit onto the upper portion of installation plate Engage the two hooks of the rear top of the indoor unit with the upper edge of the installation plate Ensure the hooks are properly seated on the installation plate by moving it in left and right Drain hose Tubing holder Taping Piping Push 2 Hook 1 Connecting cable Drain hose Press the lower left and right side of the unit against the Installa...

Page 21: ...phase conductors 3 The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from 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 give rise to burn out of the wires 4 Specification of power source 5 Confirm that electrical capacity is sufficient...

Page 22: ...nized circuit breaker between the power source and the unit A disconnection device to adequately disconnect all supply lines must be fitted Caution If a power plug is not to be used provide a circuit breaker between power source and the unit as shown below CAUTION ø8 5mm GN YL 20mm ø1 25mm GN YL 20mm The power cord connected to the outdoor unit should be complied with the following specifica tions...

Page 23: ...open position horizontally by finger pressure Remove the securing screws To remove the Grille pull lower the left and right side of the grille toward you slightly tilted and lift it straight upward 2 Check the drainage Pour a glass of water on the evaporator Ensure if water flows drain hose of indoor unit without any leakage 4 Checking the Drainage and Pipe forming ...

Page 24: ...erminal No are the same as those of indoor unit respectively 2 Attach the Grille onto the cabinet Grasp lower the left and right side of the Grille and engage four tabs on the top inside edge of the chassis Press the Grille toward the chassis until it will be back into place Terminal on the OUTDOOR UNIT Terminal on the INDOOR UNIT A UNIT Terminal on the INDOOR UNIT Power cord B UNIT 1 L 2 N 1 L 2 ...

Page 25: ... the ground Do not dip it into water and fix it on the wall to avoid swinging in the wind 2 Tape the Pipings drain hose and Connecting Cable from down to up 3 Form the pipings gathered by taping along the exterior wall and fix it onto the wall by saddle or equivalent 1 Tape the Pipings and Connectiong cable from down to up 2 Form the pipings gathered by taping along the exterior wall and the Trap ...

Page 26: ...port nut and connect the gauge manifold and the vacuum pump to the service port by the charge hose 4 Vacuum the indoor unit and the connecting pipes until the pressure in them lowers to below 76cmHg 5 Disconnect the charge hose and fit the nut to the service port Tightening torque 1 8kg m 6 Remove the valve stem nuts and fully open the stems of the 2 way and 3 way valves with a hexagon wrench 7 Ti...

Page 27: ...ction in case that the cables between indoor and outdoor units have not been connected properly it gives a warning signal of LED flickering 3 minutes after starting operation Press the forced operation key more than 3 seconds CAUTION Don t turn on all the indoor units all at once when you check the connection status In that case the sensor can not be operated properly Once 3 seconds Twice 3 second...

Page 28: ...mance 1 Measure the temperature of the intake and discharge air 2 Ensure the difference between the intake temperature and the discharge one is more than 8 C 1 Connection of power supply 1 Connect the power supply cord to the inde pendent power supply 2 Prepare the remote control Insert two batteries provided Remove the battery cover from the remote con troller Slide the cover according to the arr...

Page 29: ...the button is pressed again OPERATION MODE SELECTION BUTTON Used to select the operation mode ROOM TEMPERATURE SETTING BUTTONS Used to select the room temperature INDOOR FAN SPEED SELECTOR Used to select fan speed in four steps low medium high or CHAOS JET COOL Used to start or stop the speed cooling Speed cooling operates super high fan speed in cooling mode CHAOS SWING BUTTON Used to stop or sta...

Page 30: ...ration 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 temperature...

Page 31: ...rge 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 To remove the sensor housing connect earth conductor step motor conductor with sen sor holder Motor Evaporator P C B Screw Power Conductor Step Motor Conductor Earth Conductor Motor Cond...

Page 32: ...or and the holder eva Unhook the tab on the right inside of the chas sis at the same time slightly pull the evapora tor toward you until 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 e...

Page 33: ...ransfering clockwise counter clockwise connected manifold gauge Evacuation Open Open Open Servicing with charging cylinder 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 33 2 way 3 way Valve 3 2 1 4 5 6 Flare nut To piping connection Open position Closed positi...

Page 34: ...he gauge slightly to air purge from the hose 5 Set the liquid side 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 gas side valve to the closed position Do this quickly so that the gauge ends up indi cating 1kg cm2 g 8 Disconnect the charge set and mount the liquid side and gas side valve caps and ...

Page 35: ...acuum of 4 mmHg or less 5 Close the Low handle of the gauge turn off the vacuum pump and confirm that the gauge nee dle does not move approximately 5 minutes after turning off the vacuum pump 6 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or deplet ed replenish as needed 7 Mount the valve caps and the service port caps 8 Apply steps from 1 to...

Page 36: ...ycle however one time is not suffi cient wait approximately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from the gas side valve s service port Stopping partway will allow the gas to be dis charged If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose ...

Page 37: ...re is usually 4 5 6 0 kg cm2 G at normal condition 2 The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty 37 Cycle Troubleshooting Guide Temp difference approx 0 C Current less than 80 of rated current Temp difference approx 8 C Current less than 80 of rated current Temp difference less than 8 C Current over the rated current Temp differenc...

Page 38: ...Check the connection housing for contacting Connector related to CN POWER Display PWB Ass y Check Connector related to CN TAB1 Compressor Check each load Indoor Outdoor Fan Motor Compressor Stepping Motor etc and contacting condition of related connector PCB Board Operation Check Items Power Transformer Outdoor unit Input Voltage Output Voltage IC01D 7812 Output Indoor Outdoor unit IC02D 7805 Outp...

Page 39: ...int 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 selecting Check the connecting circuit between the remote co...

Page 40: ...for indoor temperature and connector are in bad connection or are not engaged Compressor Outdoor Fan is stopped Check the related circuit of R02H 12 1K R01H 1 0K R04H 6 2K R03H 1 0K Indoor unit Check the indoor temperature sensor is disconnected or not About 10kΩ at 25 C Check Outdoor Unit Check Relay RY COMP for driving compressor When the power About AC220V 240V is applied to the connecting wire...

Page 41: ...ON Main Power Check the related circuit of indoor Fan Motor The pin of Micom and the part for driving SSR Check the pattern Check the SSR SSR Open Indoor Fan Motor never operate SSR 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 FAN or CN MOTOR About AC 180V over About AC 50V over SSR is not damaged SSR...

Page 42: ...ndition 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 Vertical Louver Confirm that there is DC 12V between pin RED of CN U D and GND...

Page 43: ...ion error The control data can be transmitted or received between indoor and outdoor unit with one signal cable If the data be disturbed by any noise level the unit will be operated incorrectly In this case the indoor unit blinks the operation and operation LED on display and indoor fan outdoor fan COMP are not operated The unit can be reoperated by On Off control of Remocon Check Outdoor Unit Tur...

Page 44: ... 44 Electronic Control Device 1 Indoor Unit MAIN P C B ASSY 2 Display Ass y ...

Page 45: ... 45 1 Indoor Unit Schematic Diagram ...

Page 46: ... 46 Exploded View and Replacement Parts List 10 25 26 24 29 28 22 19 23 7 6 18 4 5 1 3 20 21 9 32 8 15 12 11 16 13 27 14 17 30 31 2 1 Indoor Unit A Unit 14K ...

Page 47: ... TUBING ASSY 1 16 6871A30009H PWB PCB ASSY DISPLAY 1 17 6323AQ2333A THERMISTEOR ASSY 1 18 4681AR2727H STEPPING MOTOR 1 19 5251AR2575A DRAIN HOSE ASSY 1 20 5990A30006B VANE 1 21 5990A30007B VANE 1 22 3531A10023G DISCHARGE GRILLE ASSY 1 23 3530A10018A DISCHARGE GRILLE 1 24 3531A20082G INLET GRILLE 1 25 3531A10024K FRONT GRILLE ASSY 1 26 3530A10020A FRONT GRILLE 1 27 6871A10005B PWB PCB ASSY MAIN 1 2...

Page 48: ... 48 B UNIT 9K 10 24 25 23 28 27 21 19 22 7 6 18 4 5 1 2 3 20 9 31 8 15 12 11 16 13 26 14 17 29 30 ...

Page 49: ...R0011A CONTROL BOARD 1 15 5211AR7288A TUBING ASSY 1 16 6871F30009G PWB PCB ASSY DISPLAY 1 17 6323AQ2333B THERMISTOR ASSY 1 18 4681AR2727H STEPPING MOTOR 1 19 5251AR2575A DRAIN HOSE ASSY 1 20 5990AR7225D VANE 1 21 3531A10005C DISCHARGE GRILLE ASSY 1 22 5008AR1573A DISCHARGE GRILLE 1 23 3531A20003L INLET GRILLE 1 24 3531A10001Z FRONT GRILLE ASSY 1 25 3530AR1576B FRONT GRILLE 1 26 6871A10005C PWB PCB...

Page 50: ... 50 2 Outdoor Unit 37 38 1 32 31 30 29 2 17 22 39 26 27 19 21 20 21 9 12 11 10 5 13 14 17 15 18 16 23 25 28 24 7 8 40 41 36 34 33 35 4 6 3 ...

Page 51: ...ERVICE 1 2 1 20 2A00393S VALVE SERVICE 3 8 1 21 2H02479D VALVE SERVICE 1 4 2 22 3720AP0003F PANEL ASSY REAR 1 23 6120AR2194D CAPACITOR 1 24 2H00841Z CAPACITOR 1 25 4H00442P CLAMP CAPACITOR 1 26 3A00390A TERMINAL BLOCK 2 27 3A00093A TERMINAL BLOCK 1 28 3A00261C POWER RELAY 1 29 4681A20008B MOTOR ASSY AC 1 30 1A00195B FAN ASSY PROPELLER 1 31 1WPA0800014 WASHER PLAIN 1 32 1NHA0801206 NUTS HEXAGON 1 1...

Page 52: ...P No 3828A30074X May 2000 Printed in Korea ...

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