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Multi Air Conditioner SVC MANUAL(General)

1. Outdoor unit e Procedure 1 Connect the vacuum pump to the center hose of charge set center hose 2 Evacuation for approximately one hour Confirm that the gauge needle has moved toward 0 8Torr 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 Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes 4 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed A WARNING Use a vacuum pump or Inert nitrogen gas when doing leakage test or air purge Do not compress air or Oxygen and do not use Flammable gases Otherwise it may cause fire or explosion Otherwise it may cause personal injury 42 LGE Internal Use Only 4 Gas Charging After i Part 5 Trouble Shooting Charging cylinder Outdoor unit e Procedure 1 Connect the charge hose to the charging cylinder Connect the charge hose which you dis con nected from the vacuum pump to the valve at the bottom of the cylinder f you are using a gas cylinder also use a scale and reverse the cylinder so that the sys tem can be charged with liquid 2 Purge the air from the charge hose
2. Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 3 Basic Control 6 Protection control 6 1 High pressure protection control Pressure range Compressor Pd 4069 kPa Off 3938 kPa lt Pd lt 4069 kPa 3Hz down 3840 kPa lt Pd lt 3938 kPa 3Hz down 3709 kPa lt Pd lt 3840 kPa Frequency holding 3611 kPa lt Pd lt 3709 kPa 3 Hz up Pd lt 3611 kPa Normal control 6 2 Low pressure protection control E Cooling Mode x 14 16k models are not applied Pressure range Compressor Pe 310 kPa Normal control 278 kPa lt Pe x 310 kPa 3Hz down 245 kPa Pe x 278 kPa 3Hz down 212 kPa lt Pe 245 kPa 3Hz down Pex212kPa Off E Heating mode x 14 16k models are not applied Pressure range Compressor Pe 294 kPa Normal control 255 kPa Pe x 294 kPa 3Hz down 229 kPa lt Pe x 255 kPa 3Hz down 203 kPa Pe x 229 kPa 3Hz down Pe lt 203 kPa Off 6 3 Discharge temperature control x 14 16k models are not applied Temperature range Compressor Td 2 105 C Off 100 C lt Td lt 105 C 5Hz down 95 C lt Td lt 100 C 5Hz down 93 C Td lt 95 C Frequency holding 90 C lt Td lt 93 C 3 Hz up Td lt 90 C Normal control 6 4 Input Current control Normal control Frequency down Comp
3. and of ICO1M Between and of ICO1M If there are no problems after above checks Confirm the assembly condition that are catching and interfering parts in the link of the vertical louver Copyright 2014 LG Electronics Inc All right reserved 49 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 6 6 Troubleshooting Indoor Error soa Title Cause of error Check point amp Normal condition Open Short intemal circuit emat Normal voltage DC 2 5V at 25 C plugged Open Short 02 Indoor inlet pipe sensor Soldered poorly Normal resistor pda de Unplugged lt Internal circuit errot Normal voltage DC 2 5V at 25 C plugged Open Short Normal resistor 5KQ at 25 C Unplugged 06 Indoor outlet pipe sensor Soldered poorly Internal circuit error Normal voltage DC 2 5V at 25 C plugged Check the resistance Check the voltage Check Point o N OORA Cw Copyright 2014 LG Electronics Inc All right reserved Estimate the voltage of each sensor Only for training and service purposes Unplug the sensor on Indoor unit PCB Estimate the resistance of each sensor Plug the sensor on Indoor unit PCB and Power ON 50 If the resistance of the sensor is 10KQ 5KQ
4. Remedy remove cause of error Check compressor locking Check compressor wire Is the compressor normal disconnection open negative phase Check inside insulation damage Remedy Rearrange compressor wire disconnections Replace compressor Comp Current Yes Check phase current sensing part thg POP voltage measurements at Power phase current sensing circuit 9 on standby state U V W gt DC prt 25V 02V Recheck power and installation condition Remedy replace PCB Assembly Copyright 2014 LG Electronics Inc All right reserved 63 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pes Title Cause of error Check point amp Normal condition Overload operation Outdoor fan constraint screened blocked Check outdoor fan constraint screened flow High temperature in Refrigerant leakage structure 32 Discharge pipe of the insufficient Check refrigerant leakage inverter compressor Poor INV Comp Check if the sensor is normal Discharge sensor Check the status of EEV assembly LEV connector displaced poor LEV assembly A WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts No
5. GND Signal wire When controlling multiple indoor units with event communication function with one remote controller you must change the master slave setting from the indoor unit Indoor units the master slave configuration of the product after completion of indoor unit power OFF and then ON the power after 1 minutes elapsed sign up For ceiling type cassette and duct product group change the switch setting of the indoor PCB uum um 12345678 4567 8 3 switch OFF Master 3 switch ON Slave Factory default setting For wall mount type and stand type product change the master slave setting with the wireless remote controller Refer to wireless remote controller manual for detail When installing 2 remote controllers to one indoor unit with event communication function set the master slave of the remote controller Refer to remote controller master slave selection When controlling the group some functions excluding basic operation setting fan level Min Mid Max remote controller lock setting and time setting may be limited 2 When installing more than 2 wired remote controllers to one air conditioner please connect as the right picture When installing more than 2 units of wired remote controller to one air conditioner set one wired remote controller as master and the others all as slaves as shown in the right picture You cannot control the group as shown in the right for some prod uct
6. Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air Be careful of the liquid refriger ant The procedure is the same if using a gas cylinder 3 Open the valve Lo side on the charge set and charge the system with liquid refrigerant If the system can not be charged with the spec ified amount of refrigerant it can be charged with a little at a time approximately 150g each time while operating the air conditioner in the cooling cycle however one time is not suffi cient wait approximately 1 minute and then repeat the procedure pumping down pin Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes This is different from previous procedures Because you are charging with liquid refrigerant from the gas side absolutely do not attempt to charge with larger amounts of liquid refrigerant while operating the air conditioner 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the gas to be discharged Ifthe system has been charged with liquid refrig erant while operating the air conditioner turn off the air conditioner before disconnecting the hose 5 Mount the valve stem nuts and the service port nut Use torque wrench to tighten the service port nut to a torque of 1 8 kg m Be sure to check for gas leakage A WARNING When ins
7. KN SWING CFFIBSEC ON OFF SET CLEAR a LIGHT TIVE SSEC o Qc SWING 53 LGE Internal Use Only Part 5 Trouble Shooting poe Title Cause of error Check point amp Normal condition 09 Indoor EEPROM Check 1 Check the poor soldering l Sum Error Check sum error 2 Check the insertion condition of the EEPROM 3 Check the PCB Connection Check Point 1 Check the EEPROM Direction lt EEPROM Direction Check Point gt 2 If the EEPROM value amp the Program value are not matched the Code is Displayed 3 After Checking the connection and Insertion replace the PCB or Option PCB Copyright 2014 LG Electronics Inc All right reserved 54 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display code Title Cause of error Check point amp Normal condition 10 Indoor BLDC Fan Motor The Fan is not operated Lock properly Check the Indoor fan locking Yellow White Blue Black Red Fan motor connector Tester Check Point Check the PCB during the Power on 1 Check the Voltage Red line to Black line gt The Voltage is about input voltage x 1 414 if the Voltage does not come with the above Voltage Check the power input gt Replace the PCB amp Motor 2 Check the Voltage Black line to White the Voltage is DC 15V Check the Power input Replace the motor Check the
8. Check if the sensor is disconnected Air sensor connector Check if the sensor is burned Is the sensor normal measure the resistance Condenser Check if the sensor insulation is Mid pipe connector Recheck power and installation condition damaged Condenser out pipe connector Remedy remove cause of error Main PCB Connector PCB Suction pipe connector D pipe sensor connector i i 67 Copyright 2014 LG Electronics Inc All right reserved LGE Internal Use Only Part 5 Trouble Shooting Display f error code Cause of erro Title Check point amp Normal condition Abnormal value of sensor Open Short Sensor error of high pressure 43 Bad connection of connector PCB Bad connection high pressure connector Defect of high pressure connector Open Short Defect of connector PCB Open Short Defect of outdoor main PCB Is sensor connected to PCB correctly Yes After replacement of outdoor unit main PCB is the system also abnormal Replace corresponding pressure sensor Copyright 2014 LG Electronics Inc All right reserved 68 Only for training and service purposes Connect sensor to PCB correctly LGE Internal Use Only Part 5 Trouble Shooting pug Title Cause of error Check point amp Normal condition l _ Check the indoor unit capacity 51 Over capacity Over capacity Co
9. Check refrigerant leakage Supply refrigerant if not enough refrigerant eakage point rigerant Remedy Treat the Supply additional ref Check the status of PCB CN EEV1 assembly Check the status of EEV assembly Check PCB IPM input signal connectors short circuit gt Refer to CH21 trouble shooting method f Remedy LEV assembly replacement Ccheck the sensor assembly status Check if the sensor is burned measure resistance gt 200KQ 10 25 C basis 89 Inspecting Inverter Compressor Discharge Sensor Set Multi tester as resistance measurement mode 2 Measure the resistance between inverter discharge sensor connector pins 3 Measure resistance value of 200KON 10 25 C basis 4 Check if the sensor insulation is damaged gt measure the resistance between sensor connector pin and unit assembly pipe 1MO or more ok CN_TH3 RED 4Pin Connector LGE Internal Use Only Part 5 Trouble Shooting Display eode Title Cause of error Check point amp Normal condition 35 Low Presser Error Excessive decrease of low pressure Defective low pressure sensor Defective outdoor indoor unit fan Refrigerant shortage leakage Deformation because of damage of refrigerant pipe Defective indoor outdoor unit EEV Covering clogging outdoor unit covering during the cooling mode indoor unit filter cloggin
10. Reassemble if abnormality found Check resistance between NO 19 pin and NO 20 pin of PFC module Is PCB temperature Check resistance between NO 24 pin and NO 25 pin sensing part normal of PFC module 7KQ 10 at 25 C Replace PCB if abnormality found Yes Recheck installation condition and connection of Heat sink Check Point 1 Check resistance between No 19 pin and NO 20 pin of PCB PFC module 2 Check resistance between No 24 pin and NO 25 pin of PCB PFC module only 48 56k 3 Resistance value should be in 7kO 10 at 25 C 4 Check the PFC Module No 19 20 and IPM Module No 24 25 pin soldering condition Copyright 2014 LG Electronics Inc All right reserved 103 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting gt 36k Location of SPM PSCM PFCM A PSCM PFCM B SPM gt 54k PFCM IPM Measuring resistance Measuring resistance between No 19 20 pin between No 24 25 pin Copyright 2014 LG Electronics Inc All right reserved 104 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display code Title Cause of error Check point amp Normal condition 1 ODU fan locking pan BPM Oe 2 Heatsink assembly of INV PCB assemble condi less for 5 sec when ODU 67 Fan Lock Error tion abnormal E Mcd Rd or 3 Defect of temperature sensing circuit part defect d of INV PCB Err
11. Normal Operations ioi coxc or end cb hos dione ek AUDI UR KR CR 30 2 ConipressDI GODIFOL oct saaana Aaaa ANEAN DERNE EEA ETa 30 3 EEV Electronic Expansion Valve control c ccccscceseseecseeseneeesseesesneeeecneeeseees 30 4 Qil ien T 31 5 DETST COMMON uiiierotcbibr i Venta toian uide ftam Lo enl det db b vend edel 31 5 Protection Control es od oec aad Da mail oce it mitra E Odi kasd ei ux FN di AR CA ER 32 6 1 High pressure protection eOLDtFOlrus secco gau xx Fino dau uua tR iei EB rd 32 6 2 Low pressure protection control 2 ccceeeeeeeeeeeeeeeeeeeeeeeeeeesseeeeeeeceeeeeeeeeeeeeeeeees 32 6 3 Discharge temperature control 00 ccceeeeeeeeeeeeeeeeeeeeeeeeeesseeeeeeeeeeseeeeeeeeeeeeeees 32 6 4 Input Current control 1 xen ande secet aire RU nennt ava nap E ex Re In Iu gus ur e nee cedees 32 Copyright 2014 LG Electronics Inc All right reserved 29 Only for training and service purposes LGE Internal Use Only Part 3 Basic Control 1 Normal operation Basic principle is to control the rpm of the motor by changing the working frequency of the compressor Three phase voltage is supplied to the motor and the time for which the voltage will supplied is controlled by IPM intelligent power module Switching speed of IPM defines the variable frequency input to the motor Actuator Cooling operation Heating operation Stop state Compressor Fuzzy control Fuzzy con
12. Power supply 208 230V 10 60Hz Chassis Copyright 2012 LG Electronics Inc All right reserved 7 Only for training and service purposes LGE Internal Use Only Part 1 General Information 2 3 BD Branch distributor units No of connectable indoor units Min Max 142 143 144 Model name PMBD3620 PMBD3630 PMBD3640 PMBD3641 Connectable indoor unit capacity kBtu h 9 24 9 24 9 24 9 36 BD unit 2 4 Branches Branch No of BD Accessory Applicable Specifications Type Units Model Name Model Gas Liquid To ODU To BD unit 19 05 34 To ODU To BD unit 9 52 3 8 919 05 3 4 E 09 52 3 8 sl 019 05 3 4 29 52 3 8 Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 1 General Information 3 Nomenclature 3 1 Indoor Unit Global Serial number Function A Basic L Plasma Wall mounted C Plasma ceiling cassette Front panel design color of ART COOL type R Mirror 1 Gallery Chassis naem Only Multi Indoor unit type Only Multi A ART COOL Gallery D Wall Mounted ART COOL Mirror T Ceiling cassette B Ceiling concealed duct N Vertical AHU Electrical rating G 10 220 240V 50Hz 60Hz L 30 380 415V 50 60Hz Cooling heating capacity Ex 7 000 Btu h Class 07 18 000 Btu h Class 18 Model type H Heat pump W DC
13. 2MO W GND 2MO 2MO LGE Internal Use Only Part 5 Trouble Shooting P U V W Nu Nv Nw SPM3 1 Wait until inverter PCB DC voltage is discharged after main power off 2 Pull out V V W COMP connector 3 Set multi tester to resistance mode 4 If the value between P and N terminal of IPM is short 0Q or open hundreds MQ PCB needs to be replaced IPM damaged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB needs to be replaced PCB damaged U V W Nu Nv Nw P U V W Nu Nv Nw 0 0 0 OQO 00 00 25 24 23 22 21 27 26 25 24 23 22 21 0 4 0 6 V i F D PFC IPM check U V WRST Copyright 2014 LG Electronics Inc All right reserved 77 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting B 54k inanaannaooaaags A i e ia g g g g B Bm B E B B B Bg o B e B a ES Sodpoocopo00n cfoooon Os fa Podano m uTm m u uu m m n u u LEDOM 5 Sooo g CN N _BLUE CN L _BRWON U V W CONNECTOR 1 Wait until inverter PCB DC voltage is discharged after main power off 2 Pull out CN L CN N connectors and U V W COMP Connector 3 Set multi tester to resistance mode 4 If the value between P and N terminal of IPM is short 0Q or open hundreds MQ PCB needs to be replaced IPM damaged 5 Set the multi tester to diode
14. 30V 1 Check the power outlet ule Check the rated voltage 2 The output voltage of power mod 2 12V x 3V 2 Replace ule PCB Assembly 4 ICO4D 7805 4 DC5V 4 Replace PCB Assembly 5 ICO1A KIA7036 5 The voltage of micom pin 19 5 Replace PCB Assembly DC4 5V1 Copyright 2014 LG Electronics Inc All right reserved 45 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 6 2 The Product doesn t operate with the remote controller Turn on the main power A Beeping sound is made from the indoor unit Refer to 10 1 Yes Check the voltage of power Is it possible to turn on the unit AC220V AC240V 50Hz by ON OFF button on display Yes Is the remote controller When the mark 4 is displayed working properly in LCD screen replace battery Yes Check the contact point of CN DISP 1 2 connector amp Re connector Check display PCB Assembly Voltage between CN DISP1 3 6 should be DC 5V If problem still persists Replace display PCB Copyright 2014 LG Electronics Inc All right reserved 46 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 6 3 The Compressor Outdoor Fan are don t operate Turn on the main power Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1 C at least When in air circulation mode comp
15. 5 Chile Bosk FUNCOM ma eias rota print aT nenea QU t NAA TAREA EN ASAAN 22 efsgelps eioo cue Ht 22 NECI Eoo E 23 6 8 Sleep Timer Operati MEET ETTM 24 6 9 TIMOR OM OM O 24 6 10 Weekly PROGR iet eatadusndixudcta qat au tinadi deta Nue lest od ARR bna tmu MES 24 6 11 TWO Thermistor OP PO soa susc napassvadi cante estis qu atn rd e ne g d aan ub aacra aie 25 7 Special Function amp KIT 2 tpe praeso tnter tnt ntt nd tcu Aat Ur Ru RUM prn tp 26 FINES AMBIENT COMMU eS 26 Ue SPECS CONTON MT 26 TS PUNO Elevation CI MT 26 5 Defrost Control OAD sascnwsscrevecsnsamsirnauuosnensennschnausaneusvatanaiinaushaauimemiassereanwanstancansen 28 Copyright 2014 LG Electronics Inc All right reserved 11 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 1 List of Functions amp 1 1 List of Functions Indoor _ ARTCOOL Ceiling cassette elling concealed Celling concealed Vertical ir Category Functions Wall Mounted ART COOL Mirror Gallery d way duct Low static duct High static Handling Unit pressure pressure Air supply outlet 1 1 3 4 1 1 1 Airflow direction control left amp right Auto A
16. Drain pump Float switch Open Drain pump power input 230V Float switch Normal short Drain tube installation Indoor unit installation Inclination CN Float t j mmm El CN D PUMP Check the resistance Check Point 1 Check the wire connection Open Soldered poorly gt Repair the connection or change the PCB 2 Check the resistance of float switch Abnormal Open Normal short gt Check the float switch 3 Check the level of water 4 Check the volt Of Drain pump power supply AC 230V gt Repair or Change the main PCB Copyright 2014 LG Electronics Inc All right reserved 52 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting a Title Cause of error Check point amp Normal condition One of Indoor Unit oper 07 Different Operation Mode ate cooling Another Unit At the same time this model cannot use cool and operate heating heating mode Check Point 1 Check another indoor model operation mode 2 Operating the same mode with the first operated indoor unit 3 Clearing the CHO7 Press the on off button or mode change button and matching the indoor unit mode same as the first operated indoor unit Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes ax OX dh C Sul SOLS A fee S Io BIER NOOI Ed E SAVING TEMP V
17. Is the unit properly installed Yes No Is there enough refrigerant Yes No Is the EEV properly assembled _ Yes No Is the inverter compressor gt M sensor normal Yes Replace the Thermistor Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes Check fan locking Remove blockings around heat exchanger Maintain distance between outdoor unit and the wall Check pipe folding and abnormality Check service valve lock Remedy remove cause of error Check refrigerant leakage Supply refrigerant if not enough refrigerant Remedy Treat the leakage point Supply additional refrigerant Check the status of PCB CN EEV1 assembly Check the status of EEV assembly Check PCB IPM input signal connectors short circuit gt Refer to CH21 trouble shooting method Remedy LEV assembly l replacement Ccheck the sensor assembly status Check if the sensor is burned measure resistance gt 200KQ 1096 25 C basis 64 Inspecting Inverter Compressor Discharge Sensor 1 Set Multi tester as resistance measurement mode 2 Measure the resistance between inverter discharge sensor connector pins 3 Measure resistance value of 200KQ 10 25 C basis Check if the sensor insulation is damaged gt measure the resistance between sensor connector pin and unit assembly pipe 1
18. Motor 1 Check the shaft if the shaft is not turn smoothly the Motor Power IC is defected replace the motor 2 Check the motor resistance if the shaft is turn smoothly check the resistance Check Red line to Black line Blue line to Black line gt The resistance should infinite replace the motor Copyright 2014 LG Electronics Inc All right reserved 55 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 6 7 Troubleshooting Outdoor Error gt A2UW18GFA0 A3UW24GFA0 pity Title Cause of error Check point amp Normal condition i E AOC Check compressor constraint insideicornpressor Check compressor wire open short 21 High current into the sOv rioad i eration Check compressor insulation damage compressor E Check outdoor fan constraint screened flow Outdoor fan constraint screened blocked SUCHT Burned parts inside PCB NONBEICIHIPM bumed Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off warning When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Check Fan constraint Check for short circuit of PCB IPM Remove blockings around heat exchanger Input Signal Connector Is the unit installed Maintain distance between outdoor unit 1 Set as the multi tester resistance properly and the wall l measure
19. O 09 gt D A CAUTION Do not turn on the breaker under condition that front panel and cabinet are removed Be sure to earth the air conditioner with an earthing conductor connected to the earthing terminal Conduct repair works after checking that the refrigerating cycle section has cooled down sufficiently Otherwise working on the unit the hot refrigerating cycle section can cause burns Do not tilt the unit when removing panels Otherwise the water inside the unit can spill and wet floor Do not use the welder in a well ventilated place Using the welder in an enclosed room can cause oxygen deficiency Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred gt OO 8 PP Copyright 2014 LG Electronics Inc All right reserved 4 Only for training and service purposes LGE Internal Use Only Part 1 General Information 1 2 Inspections after Repair A WARNING Check to see if the power cable plug is not dirty or loose If the plug is dust or loose it can cause an electrical shock or fire Do not use a joined power cable or extension cable or share the same power outlet with other electrical appliances otherwise it can cause an electrical shock excessive heat generation or fire Do not insert hands or other objects through the air inlet or outlet while the prod uct is operating There are sharp and moving part
20. Use Only Part 5 Trouble Shooting Display code Title Cause of error Check point amp Normal condition 1 Overload operation Pipe clogging Covering EEV defect Ref overcharge 2 Compressor damage Insulation damage Motor damage 3 Input voltage abnormal L N 4 Power line assemble condition abnormal 5 Inverter PCB assembly damage input current sensing part AC input instant over cur Inverter PCB input power 73 rent error current is over 48A peak Matter of software for 2ms E Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found Is installation condition normal Check Is input voltage normal L N phase voltage is 230V 15 gt Check connection condition and wiring if power is abnormal 1 Check L N connection condition Is AC input Wire connection 2 Check wire disconnection and wiring condition normal gt Reassemble if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Is compressor Wire connection condition normal Is inverter PCB scu Check inverter PCB assembly IPM normality normal
21. assembly power Check connection between main PCB assembly and bridge connection normal diode misconnection disconnection wiring again if abnormality found Replace main PCB assembly Monitoring PCB LED display error Recheck power and installation condition Copyright 2014 LG Electronics Inc All right reserved 60 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display Coda Title Cause of error Check point amp Normal condition Compressor Locking Overload operation Outdoor fan constraint screened blocked Burned parts inside PCB IPM Burned PCB phase current sensing circuit parts Check compressor locking Compressor wire open short Check compressor insulation damage Check outdoor fan constraint screened flow structure e Check if IMP burned refer to CH21 Check on PCB current sensing circuit parts Over current at the initial operation of the compres 26 sor location sensing sig nal for compressor opera tion is not input Ay warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Inspecting PCB phase current sensing Check fan locking Remove blockings around heat circuit exchanger 1 Set M
22. gt Intake Air Temp 0 5 C 18 C lt Intake Air Temp lt 22 C gt Intake Air Temp Intake Air Temp lt 18 C gt 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 accord ing to the Fuzzy rule While in Fuzzy operation the airflow speed of the indoor fan repeats the low airflow speed or pause as in dehumidifica tion operation 6 3 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 gt Setting Temp Compressor OFF Temp gt 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 CxIntake Air Temp gt Intake Air Temp 0 5 C Intake Air Temp lt 20 C gt 20 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 accord ing to the Fuzzy rule While in Fuzzy operation the airflow speed of the indoor fan is set to the high or the medium according to the inta
23. internal compressor If the insulation resistance is less than 2 0 MO turn on the main power supply 34 Copyright 2014 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Part 4 Test Run 2 Test Run Flow chart Test operation for indoor unit Operate the unit in cooling mode Q Refer to part4 6 Electric part Does Test operation start Yes Is cold air discharged for No more than 3 minutes Yes Is there any temperature difference between intake and discharged air Yes Is the operating current No Check the load In Out Temp normal Check pipe length and amount of Yes Refer to part4 5 Cycle part refrigerant Check for abnormal sound in SPE ralion mode cae outdoor unit comp Fan others to Heating mode Is hot air discharged No Refer to Troubleshooting After Hot Start Guide Yes Each indoor unit should be tested If the unit has accessory it should be tested Copyright 2014 LG Electronics Inc All right reserved 35 Only for training and service purposes LGE Internal Use Only Part 4 Test Run 3 Test Running 3 1 SPLIT ART cool ART cool deluxe Type Check that all tubing and wiring have been properly con nected Check that the gas and liquid side service valves are fully open 3 1 1 Prepare remote controller Remove the battery cover by pulling it according to the arrow direction Insert new batteries
24. mode 6 In case measured value is different from the table PCB needs to be replaced PCB damaged P U V W Nu Nv Nw OOOO 27 26 25 24 23 22 21 PFC_IPM check UV Ww RST Copyright 2014 LG Electronics Inc All right reserved 78 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting mei Title Cause of error Check point amp Normal condition 1 Malfunction of Compressor Input Over Current 36k 2 Blocking of Pipe 22 Max C T 17A 54k 29A 8 Low Voltage Input 4 Refrigerant Pipe length Blocked A WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts E Error Diagnosis and Countermeasure Flow Chart Are the resistance Between each phase and insulation resistance of Inverter compressor normal Is inverter PCB assembly power connection normal Is input voltage normal Is inverter PCB assembly normal Yes Is installation condition normal Is compressor Wire connection condition normal 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reass
25. off Input current Less than 10A 14A or less Over than 14A 3 Remarks The data of pressure and frequency are different model by model Copyright 2014 LG Electronics Inc All right reserved 32 Only for training and service purposes LGE Internal Use Only Part 4 Test Run B Part 4 Test Run 1 Check before Test Run 111eeeeeee eene enn nennen nennen nnn na nnne nana a aa uasa aae snu nnmnnn nnna 34 22 Test RUN FloW chart eR 35 EMail T a Aaaa R ANAKA AaS ANNEE ANENE 36 Copyright 2014 LG Electronics Inc All right reserved 33 Only for training and service purposes LGE Internal Use Only Part 4 Test Run 1 Check before Test Hun 1 Check to see whether there is any refrigerant leakage and check whether the power or transmission cable is connected properly Check liquid pipe and gas pipe valves are fully opened 2 NOTE Be sure to tighten caps Confirm that 500 V megger shows 2 0 MQ or more between power supply terminal block and ground Do not operate in the case of 2 0 MQ or less NOTE Never carry out mega ohm check over terminal control board 3 Otherwise the control board may break Immediately after mounting the unit or after leaving it turned off for an extended length of time the resistance of the insulation between the power supply terminal board and the ground maydecrease to approx 2 0 MO as a result of refrigerant accumulation in the
26. 14 LG Electronics Inc All right reserved 88 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display Coda Title Cause of error Check point amp Normal condition High temperature in 32 Discharge pipe of the inverter compressor Overload operation Outdoor fan constraint screened blocked e Refrigerant leakage insufficient Poor INV Comp Discharge sensor poor LEV assembly LEV connector displaced Check outdoor fan constraint screened flow structure Check refrigerant leakage Check if the sensor is normal Check the status of EEV assembly A WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Is the unit properly installed 7 Is there enough refrigerant 7 Yes Is the EEV properly assembled Is the inverter compressor gt sensor normal Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes Check fan locking Remove blockings around heat exchanger Maintain distance between outdoor unit and the wall Check pipe folding and abnormality Check service valve lock Remedy remove cause of error
27. 8 Sat pip Soldered poorly 2 Defect of thermistor connector Open Short Internal circuit error 3 Defect of outdoor PCB E Error Diagnosis and Countermeasure Flow Chart Yes Yes Replace corresponding outdoor unit PCB Check Point 1 Estimate the resistance of each sensor Unplugged 2 Check the value of the resistor of thermistor D pipe sensor Inverter Normal Value of the resistor is 200kQ at 25 C Air sensor Normal Value of the resistor is 10kO at 25 C Q Cond Mid pipe sensor Normal Value of the resistor is 5KQ at 25 C Oo Li Suction pipe sensor Normal Value of the resistor is 5KQ at 25 C C Condenser Out pipe sensor Normal Value of the resistor is 5KQ at 25 C Tp Q JIJ Copyright 2014 LG Electronics Inc All right reserved 94 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting ps Title Cause of error Check point amp Normal condition Bad connection of connector PCB Sensor error of high Abnormal value of sensor Pan commerlan Digi pIReSUre Connector 43 MAR Open Short Defect of high pressure connector Open Short P P Defect of connector PCB Open Short Defect of outdoor main PCB Is pressure sensor OK Check the value of pressure sensor Replace the pressure sensor Cf Output voltage is about 1 4V at 1500kPa Is sensor connected nnect sensor to PCB corr to PCB correctly Connect sensor to PCB correct
28. C module 2 Check resistance between No 24 pin and NO 25 pin of PCB PFC module only 48 56k 3 Resistance value should be in 7kO 10 at 25 C Copyright 2014 LG Electronics Inc All right reserved 101 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting gt 36k PFCM Measuring resistance between No 19 20 pin gt 54k J ee ee EEEN res oM NEM ET us 5 soo see PFCM IPM Measuring resistance Measuring resistance between No 19 20 pin between No 24 25 pin Copyright 2014 LG Electronics Inc All right reserved 102 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display code Title Cause of error Check point amp Normal condition 1 ODU fan locking Inverter PCB heatsink 2 Heatsink assembly of INV PCB assemble 65 Heatsink Sensor error Sensor iconen orhoit condition abnormal P 3 Defect of temperature sensing circuit part defect of INV PCB Error Diagnosis and Countermeasure Flow Chart 1 Check fan locking 2 Check covering of heat exchanger Is installation 3 Check distance between ODU and obstacles condition normal 4 Check pipe distortion and abnormality 5 Check service valve is opened Eliminate causes for abnormal condition Is assemble condition Check assemble condition between INV PCB heatsink and of INV PCB heatsink normal PFC amp IPM module
29. Check if the sensor is burned measure resistance gt 5KQ 10 25 C basis Is the Cond Pipe sensor normal Yes Recheck power and installation condition Copyright 2014 LG Electronics Inc All right reserved 100 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pend Title Cause of error Check point amp Normal condition 1 ODU fan locking 2 Heatsink assembly of INV PCB assemble condi 62 Heatsink High error cei die im tion abnormal Pelee OVE 3 Defect of temperature sensing circuit part defect of INV PCB E Error Diagnosis and Countermeasure Flow Chart 1 Check fan locking 2 Check covering of heat exchanger Is installation 3 Check distance between ODU and obstacles condition normal 4 Check pipe distortion and abnormality 5 Check service valve is opened Eliminate causes for abnormal condition Is assemble condition Check assemble condition between INV PCB heatsink and of INV PCB heatsink normal PFC amp IPM module gt Reassemble if abnormality found Check resistance between NO 19 pin and NO 20 pin of PFC module Is PCB temperature Check resistance between NO 24 pin and NO 25 pin sensing part normal of PFC module gt 7KQ10 at 25 C gt Replace PCB if abnormality found Yes Recheck installation condition and connection of Heat sink Check Point 1 Check resistance between No 19 pin and NO 20 pin of PCB PF
30. E S P value of previous air flow rate will be maintained by remembering the E S P value prior to the shift Copyright 2014 LG Electronics Inc All right reserved 17 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 5 Reliability 5 1 Hot start When heating is started the indoor fan is stopped or very slow to prevent the cold air carry out When the temp of heat exchanger reach 30 C model by model indoor fan is started 5 2 Self diagnosis Function The air conditioner installed can self diagnosed its error status and then transmits the result to the central control Therefore a rapid countermeasure against failure of the air conditioner allows easy management and increases the usage life of air conditioner Refer to trouble shooting guide 5 3 Soft dry operation 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 Intake air Temp Setting Temp 26 C lt intake air temp 25 C 24 C lt intake air temp lt 26 C intake air temp 1 C 22 C lt intake air temp lt 24 C intake air temp 0 5 C 18 C lt intake air temp lt 22 C intake air temp intake air temp lt 18 C 18 C While compressor off the indoor fan repeats low airflow speed and stop While the intake air tem
31. I G http biz lgservice com Multi Air Conditioner MODEL Multi Inverter Type CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Air Conditioner Service Manual TABLE OF CONTENTS Part 1 General Information paa n Dia xi eibi basi pna rqiiptdmeldi sar inreneianneliancanvandinans 2 1 Safety Precautions rm 3 2 Model REI LUTTE 6 d Nomenclature ce Cate oa UR Hehe a aa abit aiieieo 9 Part 2 Functions amp Controls e rto be pda i baee inb Cice pub inte Dart en 11 1 List of Functions amp Accessory science tice 12 ZAI FION iiic e bU MU MH edet tob amate Mer EQ b n Nm UM a 14 3S Air PUIIVIRO ood cesta ace cece teen Sata bte pee eee eM nU Nd UA 16 4 Installation FUlGHORS board coe Ra d abel a p a e ER ced rb e o ta uS 17 MILI deem Em 18 6 Convenience Functions amp Controls sessee nne 19 Z o9peclal Function amp KIT seca ntact iene nemo 26 Part 3 Basic Control c eT 29 n ON AN OPS ARMOR ewm a aa 30 2 Compressor CONG isis cua ete een inna ee 30 3 EEV Electronic Expansion Valve control cccccccsceceeseeeseeeeesteeeesreesseeeeas 30 BON PERT GOLFO up con cai Od viewer Rat a a A etme 31 5 Defrost GODEFOI cuis br a P Udine bibi diebns dtd Ural Rau 31 6 xem UT 32 XT EE NI TIMERE RO 33 1 Check before Test Run 232i rdi sd lcdkdoadnibc c
32. Inverter heat pump Indicates that this is multi system indoor unit using R410A 3 2 Outdoor Unit Global A4U W 24 n Serial number Function A Basic Multi type F Free joint multi type Electrical rating G 19 220 240V 50 60Hz L 39 380 415V 50 60Hz Cooling heating capacity Ex 24 000 Btu h Class 24 48 000 Btu h Class 48 Model type W DC inverter heat pump Indicates that this is multi system outdoor unit using R410A Ex A4U Connectable max 4 indoor units A9U Connectable max 9 indoor units Copyright 2014 LG Electronics Inc All right reserved 9 Only for training and service purposes LGE Internal Use Only Part 1 General Information 3 3 BD units Global e m 2 o Lo Serial number Number of connectable indoor units Max capacity of connectable indoor units 36 mean that 5k 24k Indoor unit connected to BD unit BD Branch distributor M Multi system outdoor unit P Parts Copyright 2014 LG Electronics Inc All right reserved 10 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls B Part2 Functions amp Controls 1 List of Functions amp ACCOSSODTI ouaies cni adnata MA GRE Mad cuival tute iU ua std c Gru d 12 ZEE b Ae TET E 14 21 Auto Swing left amp rs M n 14 2 2 Auto swing UPR CIOWIT cbssadicidtiuten uid qs Gibts ea do Putin Ka a da OD a a e MERE ERAS E 14 2 3 Chaos
33. MO or more AB CN DISCHARGE BLACK 3Pin Connector LGE Internal Use Only Part 5 Trouble Shooting Display ende Title Cause of error Check point amp Normal condition 35 Low Presser Error Excessive decrease of low pressure Defective low pressure sensor Defective outdoor indoor unit fan Refrigerant shortage leakage Deformation because of damage of refrigerant pipe Defective indoor outdoor unit EEV Covering clogging outdoor unit covering during the cooling mode indoor unit filter clogging dur ing heating mode SVC valve clogging Defective outdoor unit PCB Defective indoor unit pipe sensor E Error diagnosis and countermeasure flow chart Is service valve opened Yes Are communication cable piping normal Yes Is amount of refrigerant normal refer refrigerant part Yes Is fan normal in heating outdoor fan in cooling indoor fan Yes No Is strainer Ok Yes Are the values of manifold and low pressure sensor same Is the low pressure value actually low Yes Check indoor outdoor unit LEV Check Indoor unit PCB Check indoor outdoor unit installation conditions Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes Open service valve check communication piping correction Is there pipe crack or trace of refrigerant leakage Yes Wel
34. Part 5 Trouble Shooting pei Title Cause of error Check point amp Normal condition DC Compressor Compressor Check the connection of comp wire U V W 26 Position Startina fail error Malfunction of compressor g Check the component of IPM detection parts A warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Bi Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found Is installation condition normal 1 Check resistance between each terminal of compressor 0 438 0 628 7 2 Check insulation resistance between compressor terminal and pipe over 2MQ gt Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal 1 Check inverter PCB assembly U V W connector connection condition Is compressor 2 Check wire disconnection and wiring Wire connection 3 Check compressor terminal connection condition condition normal bad contact gt Reassemble if abnormality found Check inver
35. Replace inverter PCB assembly Recheck power and installation condition Copyright 2014 LG Electronics Inc All right reserved 107 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting gt 36k lt Noise Filter wiring Check Point gt lt Main PCB wiring Check Point gt lt Input Power Source Check Point gt Copyright 2014 LG Electronics Inc All right reserved 108 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting gt 54k lt Input Power Source Check Point gt lt Inverter PCB wiring Check Point gt Copyright 2014 LG Electronics Inc All right reserved 109 Only for training and service purposes LGE Internal Use Only Part 6 Service Order g Part 6 Service Order 1 PCB Service Order 0 ccccccccccccccceccccecaecececeecuueuceeseaueueesecuuaeeeseeaueeeseeeuueeeeeeeaaneeeeseaaeess 111 Copyright 2014 LG Electronics Inc All right reserved 110 Only for training and service purposes LGE Internal Use Only Part 6 Service Order 1 PCB Service Order gt A2UW18GFAO A3UW24GFAO B Remove Top Cover and Take Terminals from PCB Hang wires up on the Rib Control Box Cover with a tool from Case and Insert PCB into Control Box Remove PCB Screws 6ea Replace New PCB Tighten PCB Screws 6ea Raise PCB and Re wire terminal Assemble C Box and Top Cover take terminals from PCB into
36. SWING UD COW c 14 AP HOW StS ome Mc 15 2 5 Chaos wind AUTO WING ncasoswecoetuesenasscnuieuecaneasvenmeennmnnsensdinnunemnanettaranmucanseimnawanvameanses 15 2 6 Jet ool Mode DOLO sonde io tesla pilis gual einai aiaa aa a ea iai 15 27 SOIT WANG SWIG T X 15 SAI purify Sscccsasccacserceseunesansmensccnumnnanessereraanmenesennaueranaanmenncunsennnasceuimmenaguesaiaturacannanens 16 3 1 PLASMA Air PUbtvin Syster ios Cange Suitencubuntealsbardincdaivauet wbacvaubcnenies tone den da Ent 16 4 Installation FUNCIONS acer teoxti taa OR sanae d tenus taa otio lod ta uel Ga 17 4 1 E S P External Static Pressure Setting Lucus saccus easier amicos ax sap tp r i od si iE Stats 17 MILI W P 18 BIOL Statics TS 18 5 2 Sel diagnosis FUNGUO s soccorso ntt dite nau xtate RM eA EU Anaan anaana Sanaa 18 5 9 SOIT ONY Oper NOI ueste bn ads aud adver tatran adt cides Gh stude delle REDA Rau dades a ba A 18 6 Convenience Functions amp Controls ssssssseeeeeeenene 19 6 1 Cooling amp heating ODGSFallOFIS cusan nae ta per Remb pe Mx tUm ME anesan tanaan 19 6 2 Auto cleaning Operation usos ceica mdiicuste id uuu ta bad cus edats tu dA ela RUM 20 6 3 Auto Operation Artificial Intelligence succ xs ace mnia ater tuoi rapti iaa tract mera gated 20 6 4 Auto restart DDSaItiDDL uou copiar Dr ancien dua Seca at Fan ds cd quent Rafa SH cU ERROR OU an 21 6
37. W18GDCL1 AMNW24GDCL1 LMN187HVT LMN247HVT AMNWO9GDBA1 AMNW12GDBR1 po One BB LMANOS7HVT LMAN127HVT TB nec xi LMAN187HVT ART COOL Gallery SF AMNWO9GAF11 AMNW12GAF11 LMANO7HVP LMAN127HVP 4 way TR AMNWO7GTRAO AMNWOSGTRAO AMNW12GTRAO a LMCNO77HV LMCNO97HV LMON125HV Ceiling g cassette we AMNW18GTQA0 LMCN185HV Low static pressure Li AMNWO9GL1A0 Slim LMDNO96HV Ceilin L2 AMNW12GL2A0 AMNWI8GL2AO 9 LMDN126HV LMDN186HV concealed duct High Static pressure BG AMNW24GBGAO AMNW36GBGAO E LMHN240HV LMHN360HV Vertical AHU NJ AMNW24GNJAO AMNW36GNJAO LMVN240HV LMVN360HV Indicates color of panel ART COOL Gold G White Silver H Blue B Gallery 1 ART COOL Mirror Mirror R Silver V White W Copyright 2014 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes 2 2 Outdoor units Part 1 General Information Multiple Piping Type ModaliName A2UW18GFAO0 A3UW24GFAO A4UWSGGFAO LMU18CHV LMU24CHV LMU36CHV No of connectable indoor units Min Max 2 2 2 3 2 4 Total capacity index of connectable indoor units 24 33 48 Power supply 208 230V 10 60Hz e T Chassis La E t ab Branch Distribution type Model Name A8UW54GFAO LMU540HV No of connectable indoor units Min Max 2 8 Total capacity index of connectable indoor units 73
38. a complete whole Copyright 2014 LG Electronics Inc All right reserved 111 Only for training and service purposes LGE Internal Use Only P NO MFL68280201 January 2014
39. ana 45 6 1 The Product doesn t operat at all iisscmsierareasveunsunceuseseeevacansanimanmnenwnnansecanasnennwencianens 45 6 2 The Product doesn t operate with the remote controller ccccsccccceeessssssseeeeeeeeees 46 6 3 The Compressor Outdoor Fan are don t operate sess 47 6 4 When indoor Fan does mot operate eessseseeeeneeneeenn nenne 48 6 5 When the louver does not operate ccscccceecceeeeeesseeeeeeeeeeeeeeeeneeeeeeeeeeeneeeeeeenenseas 49 6 6 Troubleshooting Indoob Eror ueeeseeunecesiiivetinaii lava onde nadie diaaa 50 6 7 Troubleshooting Outdoor Error uccisi nir dig etai egstasu tese ima ndun ud CO t Bad each 56 Copyright 2014 LG Electronics Inc All right reserved 38 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 1 Self diagnosis Function __ 1 1 Error Indicator Indoor Ceiling Cassette Type Display 10 degrees 1 degrees The number of times to blink Error code Standard Libero Type Display Libero R Libero E Artcool Mirror Cooling Cooling 1 degrees Heating Heating 10 degrees Plasma Preheating 1 degrees Plasma 10 degrees Preheating The number of times to blink Error code Error Indicator The function is to self diagnoisis airconditioner and express the troubles identifically if there is any trouble Error mark is ON OFF for the operation LED of evaporator body in the same manner as th
40. andby state gt measured value within 2 5V 0 2V Remedy remove cause of error Recheck power and installation condition e t 6 Comp Current Copyright 2014 LG Electronics Inc All right reserved 66 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display code Title Cause of error Check point amp Normal condition Open Short 41 D pipe sensor Inverter Soldered poorly Normal resistor 200KQ at 25 C Unplugged Internal circuit error Open Short 44 Air sensor Soldered poorly Normal resistor 10KQ at 25 C Unplugged Internal circuit error Open Short 45 Condenser Mid pipesensor Soldered poorly Normal resistor 5KQ at 25 C Unplugged Internal circuit error Open Short 46 Suction Pipe sensor Soldered poorly Normal resistor 5KQ at 25 C Unplugged nternal circuit error Open Short 48 Condenser Out pipe sensor Soldered poorly Normal resistor 5KO at 25 C Unplugged Internal circuit error Only for training and service purposes Connect sensor PCB to main PCB correctly Is sensor PCB conn ected to main PCB correctly e Remedy reassemble the sensor Check the status of the PCB Is the sensor properly connector assembly assembled Check the status of the sensor assembly e Remedy reassemble the sensor
41. at 25 C then sensor is normal If the resistance of the sensor is 0 KO or then sensor is abnormal Change the sensor If the voltage of the sensor is 2 5Vdc at 25 C then sensor is normal If the resistance of the sensor is O or 5Vdc then sensor is abnormal gt Repair or Change the PCB LGE Internal Use Only Part 5 Trouble Shooting pee Title Cause of error Check point amp Normal condition C d Connection of wire 03 ommunicaton Open Short X Main PCB Volt DC12V Wired hic Wrong connection Noise interference Wired R C Indoor Unit ES CN REMO 12V S GND 12V S GND ces 12Vdc 12Vdc E J d d Check the Volt Check the Volt Check Point 1 Check the wire connection Open Short Repair the connection 2 Check the soldering state of connector Soldered poorly Repair or Change the PCB 3 Check the volt Of main PCB power source DC 12V Repair or Change the main PCB 4 Check the installation of wired remote controller Noise interference gt Adjust the state of installation Copyright 2014 LG Electronics Inc All right reserved 51 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting poss Title Cause of error Check point amp Normal condition The connection of wire Drain pump Float switch 04
42. ce between ODU and obstacles condition normal 4 Check pipe distortion and abnormality 5 Check service valve is opened gt Eliminate causes for abnormal condition Ie assemble condition Check assemble condition between INV PCB heatsink and PFC amp IPM module of INV PCB heatsink normal Reassemble if abnormality found Check resistance between NO 14 pin and NO 16 pin of IPM Is PCB temperature module sensing part normal 85KQ 6 3 at 25 C Replace main PCBA it abnormality found Recheck installation condition and connection of Heat sink tr 34 Gs AN ris p Copyright 2014 LG Electronics Inc All right reserved 74 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display Coda Title Cause of error Check point amp Normal condition 1 ODU fan locking Forts TUR M Las e Heatsink assembly of INV PCB assemble condi for 5 sec when ODU fan 67 Fan Lock Error tion abnormal Seen eating Or ieee Defect of temperature sensing circuit part defect 9 of INV PCB Error Diagnosis and Countermeasure Flow Chart Is ODU Fan Motor Assemble Check ODU Fan Motor assemble condition and fan locking condition normal gt Reassemble or replace if abnormality found 1 Set the multi tester to diode mode 2 Check voltage between 1pin and 4pin of Fan Motor Is ODU Fan Motor normal 1 0 2V 3 Replace Inverter PCB if abnor
43. d reconnect the cracked portion and recharge refrigerant Check and replace related parts error 105 108 reference Replace the strainer Replace the pressure sensor No Adjust the amount of refrigerant Additive charge If the temperature difference between inlet and outlet of strainer is so large that frost or ice formation can be seen or confirmed then clogging of strainer should be checked Notice it is not full ice forming of strainer in case that there is not at inlet portion but 65 at outlet portion LGE Internal Use Only Part 5 Trouble Shooting Display Coda Title Cause of error Check point amp Normal condition AC Input current Comp phase current sensing cir PCB sensing circuit part Check power input connector Comp output a0 cuit basic vlotage sens burned current sensing circuit ing error Ay warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Check voltage measurement Is AC input current on the input current Fig 1 sensing part normal at the power on standby state DC OV x 0 2V Remedy remove cause of error DC voltage measurement Is the Comp phase at the measurement point in Current sensor figure 2 at power on part normal st
44. d then operated in order that the air outflow could reach further 2 7 Swirl wind Swing Vane 2 It is the function for comfort cooling heating operation The diagonal two louvers are opened the more larger than the other louvers After one minute it is opposite Vane 1 Vane 3 Vane 4 Comparison of Air Flow Types 4 Open conventional Swirl Swing New Copyright 2014 LG Electronics Inc All right reserved 15 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 3 Air purifying 3 1 PLASMA Air Purifying System The PLASMA Air Purifying System not only removes microscopic contaminants and dust but also removes house mites pollen and pet fur to help prevent allergic diseases like asthma This filter that can be used over and over again by simply washing with water Dust electrode discharge Dust particles lonizer Photo Catalyst Coated Mesh LAAAAAA VNV V lil V V VV V v VV NW Copyright 2014 LG Electronics Inc All right reserved 16 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 4 Installation Functions 4 1 E S P External Static Pressure Setting This is the function that decides the strength of the wind for each wind l
45. e controller O O O Oo PQWRHQOFDB General central controller Non LGAP X X X X X X X Network Network Solution LGAP O O O O O O O function Dry contact PQDSA 1 PQDSB 1 PQDSBC PQADSBNGCM1 PI 485 for Indoor Unit X X X X X X X ial Zone controller X X X X X X X ecce t CTI Communication transfer interface X X X X X X X Electronic thermostat X X X X X X X Remote temperature sensor X X X PQRSTAO Others Group control wire PZCWRCG3 Telecom shelter controller X X X X X X X Connector for water level sensor O X O X X X X Note O Applied X Not applied Accessory model name Installed at field ordered and purchased separately by the corresponding model name sup plied with separate package Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes 12 LGE Internal Use Only Part 2 Functions amp Controls Outdoor Category Functions Remark Defrost Deicing O High pressure switch X Low pressure switch X Reliability Phase protection X Restart delay 3 minutes O Self diagnosis O Soft start O Test function X Convenience Night Silent Operation O Network function Network solution LGAP O Note o Applied x Not applied Option Model name amp price are different according to options and assembled in factory with main unit Accessory model name Installed at field ordered and purchased separately by the corresponding model name su
46. e following table If more than two troubles occur simultaneously primarily the highest trouble fo error code is expressed After error occurrence if error is released error LED is also released simultaneously To operate again on the occurrence of error code be sure to turn off the power and then turn on Having or not of error code is different from Model Indoor Error Error code Description Indoor Status 00 No Error ON 01 Indoor Room themistor error OFF 02 Indoor in piping sensor error OFF 03 Remote controller error OFF 04 Drain Pump error OFF 05 Communcation error between in and out OFF 06 Indoor Out Piping sensor error OFF 07 Differnt mode operation OFF 09 EEPROM Check Sum Error OFF 10 Indoor BLDC Fan Lock OFF Copyright 2014 LG Electronics Inc All right reserved 39 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 1 3 Error Indicator Outdoor Outdoor Error Ex Error 21 DC Peack 2 Times LED01G I RED LED02G 2 Times i 1 Sec 2 Times GREEN cien Contents ro dad greed case of Error ped 21 DC Link Peak IPM Fault 2times 1times Over Rated Current Off 22 CT 2 Max CT 2times 2times Input Over Current Off DC Link Low Volt DC Link Volt is below 140Vdc 23 DC Li
47. e measuring point DC voltages at Power on standby state Remedy inspect repair power 3 If the measurements are outside DC 2 5V 0 2V the board parts are decided as burned No Check if the input voltage is Is the input voltage within AC 190 260 V normal Yes Check Fan constraint indoor outdoor unit Remove blockings around heat exchanger Maintain distance between outdoor unit and the wall Check overcharge refrigerant leakage Check service valve lock Check pipe folding Is the unit installed properly Check voltage measurement on the input current at the power on standby state DC OV 0 2V Remedy replace PCB Assembly Copyright 2014 LG Electronics Inc All right reserved 58 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pnts Title Cause of error Check point amp Normal condition DC Link Voltage is above 420Vdc Check Input Voltage 23 DC Link High Low Volt DC Link Voltage is below Check PCB DC Link voltage sensor parts 140Vdc A warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Inspecting PCB DC Link voltage sensing i i i circuit ls theinpul Hass beu id M p 1 Set Multi te
48. efective compressor Current is low igh Defective 4 way reverse valve Higher Excessive amount of High pressure does not quickly Normal refrigerant rise at the beginning of operation Insufficient amount of Current is low Lower Higher refrigerant Leakage Clogging NOTICE 1 The suction pressure is usually 8 5 9 5kg cm2G Cooling at normal condition R410A 2 The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty Copyright 2014 LG Electronics Inc All right reserved 44 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 6 Electronic Parts 6 1 The Product doesn t operate at all Turn off the main power and wait for 10 seconds Turn on the main power again A Beeping sound is made from the indoor unit Primarily the operating condition of Micom is O K Check Remote controller amp Receiver Check CN DISP1 CN DISP2 of indoor PCB Check the voltage of power supply AC220V AC240V 50Hz and check for the following The voltage of main power supply The voltage applied to the unit The connecting method of Indoor Outdoor connecting cable each color The PCB Assembly Fuse Noise Filter Power Module Bridge Diode etc The operation check of the Indoor PCB Assembly Procedure Specification Remedy 1 The input voltage of power mod 1 AC230V
49. emble or manage if abnormality found 1 Check resistance between each terminal of compressor 0 438 0 628 7 2 Check insulation resistance between compressor terminal and pipe over 2MQ gt Replace compressor if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Check connection between inverter PCB assembly and bridge diode misconnection disconnection wiring again if abnormality found Check L N phase is 230V 15 Check connection condition and wiring if power is abnormal Recheck power and installation condition Copyright 2014 LG Electronics Inc All right reserved 79 Only for training and service purposes Check inverter PCB assembly IPM normality Replace inverter PCB assembly LGE Internal Use Only Part 5 Trouble Shooting Check Point 1 Check the power source 230V 15 2 Check the fan operation is right 3 Check the current 4 Check the install condition 5 Check the CT Sensor Output signal 36k Check output the CT Sensor DC 2 5 0 2V 54k Check output pin 1 2 of the CT Sensor 5V lt CT Sensing Check Point gt lt Inverter PCB gt lt CT Sensing Check Point gt Copyright 2014 LG Electronics Inc All right reserved 80 Only for training and service purposes LGE Internal Use On
50. embly damage A warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts E Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal 1 Check resistance between each terminal of compressor Are the resistance 0 438 0 628 7 EHE cach phase and 2 Check insulation resistance between compressor insulation resistance of Inverter terminal and pipe over 2M9 compressor normal Replace compressor if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality found Is compressor Wire connection condition normal Check Is input voltage normal L N phase is 230V 15 gt Check connection condition and wiring if power is abnormal Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly Is inverter PCB assembly normal Recheck power and installation condition Copyright 20
51. erant overcharged an EEV connector displaced Check the status of EEV assembly poor EEV assembly Check the status of sensor assembly burn Poor Cond Pipe sensor assembly burned A WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Check fan locking Inspecting Cond Pipe Sensor Remove blockings around heat exchanger 1 Set Multi tester as resistance Maintain distance between outdoor unit and measurement mode the wall 2 Measure the resistance between rated Check pipe folding and abnormality speed Comp Discharge sensor connector lt Is the unit properly installed Check SVC valve lock pins ar aT TM 3 Measure resistance value of 5kQN 10 Yes y 25 C basis 4 Check if the sensor insulation is damaged gt measure the resistance ET between sensor connector pin and unit Check if refrigerant is overcharged assembly pipe 1MO or more Is the refrigerant properly charged 2 Remedy adjust refrigerant volume Yes CN C PIPE Violet 3Pin Connector Check the status of PCB CN EEV1 assembly Check the status of EEV assembly Is the EEV properly assembled 7 Remedy EEV reassemble replacement Yes Check the sensor assembly status
52. evel and because this function is to make the installation easier If you set ESP incorrectly the air conditioner may malfunction This setting must be carried out by a certificated technician When pressing the a button and button simultaneously for more than 3 seconds the system will be entered into the installer setting mode After entering into the installer setting mode select the E S P code value by pressing the button E S P code value 03 Select the desired air flow rate with the button Whenever pressing the 2 button SLo Lo Med Hi Po will be indicated Select the desired air flow rate value with the temperature up A down button E S P value range 0 255 E S P value will be indicated at the upper right section of the display window When pressing the button currently established E S P value will be set up When pressing the a button and button simultaneously for more than 3 seconds after the setting has been completed the setting mode will be released If there isn t any button input for more than 25 seconds the installer setting mode will also be released Precaution shall be taken not to alter the E S P value corresponded to each air flow section E S P value can be varied according to the products n the case of going to the next air flow rate stage by pressing the fan speed button during the setup of the E S P value the
53. f INV PCB Inverter PCB heatsink tem 52 Heatsink High perature is over 85 C E Error Diagnosis and Countermeasure Flow Chart 1 Check fan locking 2 Check covering of heat exchanger Is installation 3 Check distance between ODU and obstacles condition normal 4 Check pipe distortion and abnormality 5 Check service valve is opened gt Eliminate causes for abnormal condition Is assemble condition Check assemble condition between INV PCB heatsink and of INV PCB heatsink normal PFC amp IPM module Reassemble if abnormality found Check resistance between NO 14 pin and Is PCB temperature NO 16 pin of IPM module sensing part normal 85kQ 6 3 at 25 C Replace main PCBA it abnormality found Recheck installation condition and connection of Heat sink m MES dere IE ty ZR Copyright 2014 LG Electronics Inc All right reserved 73 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pes Title Cause of error Check point amp Normal condition ODU fan locking e Heatsink assembly of INV PCB assemble 65 Heatsink Sensor error Inverter PEB heatsink pen condition abnormal sor is open or short Defect of temperature sensing circuit part defect of INV PCB E Error Diagnosis and Countermeasure Flow Chart 1 Check fan locking 2 Check covering of heat exchanger Is installation 3 Check distan
54. g and service purposes Bolt Tubing connection 3 1 4 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 between the intake temperature and the discharge is more than 8 C Cooling or reversely Heating Discharge air Discharge i Chassis cover Intake temperature Discharge air Discharge temperature Intake temperature Discharge air Www Discharge temperature 36 LGE Internal Use Only Part 4 Test Run 3 2 Ceiling Cassette Type 3 2 1 PRECAUTIONS IN TEST RUN The initial power supply must provide at least 90 of the rated voltage Otherwise the air conditioner should not be operated CAUTION D For test run carry out the cooling operation first even during winter season If heating operation is carried out first it leads to the trouble of compressor Carry out the test run more than 5 minutes without stopping Test run will be cancelled 18 minutes later automatically The test run is started by pressing the room temperature checking button and down timer button for 3 seconds at the same time To cancel the test run press any button 3 2 2 CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE After completing work be sure to measure and record trial run pro
55. g dur ing heating mode SVC valve clogging Defective outdoor unit PCB Defective indoor unit pipe sensor E Error diagnosis and countermeasure flow chart Open service valve check communication piping correction Is service valve opened Yes Are communication cable piping normal Is amount of refrigerant normal refer refrigerant part Yes Yes Are the value of manifold gauge and pressure sensor same Is the low pressure value actually low Check indoor outdoor unit LEV Check Indoor unit PCB Check indoor outdoor unit installation conditions Is strainer Ok Is there pipe crack or trace of refrigerant leakage Yes Weld reconnect the cracked portion and recharge refrigerant Replace the strainer Replace the pressure sensor Adjust the amount of refrigerant Additive charge If the temperature difference between inlet and outlet of strainer is so large that frost or ice formation can be seen or confirmed then clogging of strainer should be checked Notice it is not full ice forming of strainer in case that there is not at inlet portion but at outlet portion Copyright 2014 LG Electronics Inc All right reserved 90 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pend Title Cause of error Check point amp Normal condition Transmission Error Communication E
56. hanged within 30 sec onds Condition of compressor turned off When intake air temperature reaches 4 C above the setting temperature Condition of compressor turned on When intake air temperature reaches 2 C above the setting temperature Condition of indoor fan turned off While in compressor on indoor pipe temp lt 20 C While in compressor off indoor pipe temp lt 30 C While in defrost control between the indoor and outdoor fans are turned off Compressor 2minutes delay After compressor off the compressor can restart minimum 2 minutes later NOTE Some Models are different by temperature of thermo ON OFF CST Duct CVT type indoor unit matched with Single Outdoor unit Multi Outdoor unit Multi V Outdoor unit CST Duct type indoor unit matched with Universal Outdoor unit Thermo ON 2 C above setting temp Thermo ON Setting temp Thermo OFF 4 C above setting temp Thermo OFF 3 C above setting temp Copyright 2014 LG Electronics Inc All right reserved 19 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 2 Auto cleaning operation Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor Used after the Cooling Operation before turning the unit off clean the Evaporator and keep it dry for the next opera tion The function is easy to operate as it is accessed through the Re
57. he intake air temp at that time 26 Cs Intake Air Temp gt 25 C 24 Cs Intake Air Temp lt 26 C gt Intake Air Temp 1 C 22 C Intake Air Temp lt 24 C gt Intake Air Temp 0 5 C 18 C Intake Air Temp lt 22 C gt Intake Air Temp Intake Air Temp lt 18 C gt 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 accord ing to the Fuzzy rule While in Fuzzy operation the airflow speed of the indoor fan is automatically selected according to the temperature Copyright 2014 LG Electronics Inc All right reserved 20 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 3 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 set ting temp the compressor is turned off When 0 5 C or more above the setting temp the compressor is turned on Compressor ON Temp gt Setting Temp 0 5 C Compressor OFF Temp gt 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 lt Intake Air Temp gt 25 C 24 C lt Intake Air Temp lt 26 C gt Intake Air Temp 1 C 22 C lt Intake Air Temp lt 24 C
58. he related circuit of indoor Fan Motor The pin No 68 of micom and the part for driving SSR Q01M Check the related pattern Check the SSR SSR Open Indoor Fan Motor never operate SSR short Indoor Fan Motor always operates in case of ON or OFF Turn on the main power Check the SSR high speed operation by remote control the Indoor Fan Motor is connected The voltage of Pin No 1 orange and 3 black of CN FAN About AC 160V over About AC 50V over SSR is not damaged Check SSR Copyright 2014 LG Electronics Inc All right reserved 48 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 6 5 When the louver does not operate Confirm that the vertical louver is normally geared with the shaft of Stepping Motor If the regular torque is detected when rotating the vertical louver with hands Normal Check the connecting condition of CN U D or CNOL R Connector Check the soldering condition on PCB of CN U D or CNOL R Connector Check the operating circuit of the vertical louver Confirm that there is DC 12V between pin of CN U D CNOL R and GND Confirm that there is a soldering short at following terminals Between D and of MICOM Between 2 8 9 and of MICOM Between
59. heat exchanger 1 Set Multi tester as resistance Maintain distance between outdoor unit and measurement mode the wall 2 Measure the resistance between rated Check pipe folding and abnormality speed Comp Discharge sensor connector Check SVC valve lock pins Check fan locking lt Is the unit properly installed 3 Measure resistance value of 5kN 10 25 C basis 4 Check if the sensor insulation is damaged gt measure the resistance between sensor connector pin and unit assembly pipe 1MQ or more Remedy remove cause of error Is the refrigerant l E gt Check if refrigerant is overcharged Remedy adjust refrigerant volume CN C PIPE Violet 3Pin Connector Is the EEV properly Check the status of PCB CN EEV1 assembled 7 assembly a Check the status of EEV assembly Remedy EEV reassemble replacement Check the sensor assembly status Check if the sensor is burned measure resistance gt 5KQ 10 25 C basis Is the Cond Pipe sensor normal Replace the Thermistor Copyright 2014 LG Electronics Inc All right reserved 72 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display Coda Title Cause of error Check point amp Normal condition ODU fan locking e Heatsink assembly of INV PCB assemble condi tion abnormal Defect of temperature sensing circuit part defect o
60. ight 2014 LG Electronics Inc All right reserved 82 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting gt 54k lt Inverter PCB gt lt DC Link Voltage Check Point gt lt Connection Check Point gt lt DC_LINK Sensing Check Point gt Copyright 2014 LG Electronics Inc All right reserved 83 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pois Title Cause of error Check point amp Normal condition Abnormal Input voltage Check the power source Input volt eee re 140Vac 300Vac Check the components ll Error Diagnosis and Countermeasure Flow Chart Is input voltage normal Check L N Voltage is 230V 15 Is Inverter PCB Normal Replace inverter PCB assembly Yes Recheck power and installation condition Check Point 1 Check the Input Voltage L N gt 230V 10 2 Check Input Voltage Sensor output voltage 2 5Vdc 10 lt Input Power Source Check Point gt Copyright 2014 LG Electronics Inc All right reserved 84 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting peer eereere lt CT Sensing Check Point gt lt Inverter PCB gt lt Input Voltage Sensing Check Point gt Copyright 2014 LG Electronics Inc All right reserved 85 Only for training and service purposes LGE Internal Use Only
61. igure 1 below 4 Measure voltages of U Nu V Nu W Nu as shown in figure 2 below 5 If the measurements are distinctively different as in the figures the IPM is decided to be burned Nw Nv Nu Figure 1 Copyright 2014 LG Electronics Inc All right reserved 57 Only for training and service purposes Part 5 Trouble Shooting Table 1 Resistance 2 Terminal Inverter Comp Model U V 1 125 at25 C 18 24k V W 1 125 at25 C W U 1 125 at25 C Table 1 Resistance of terminal insulations U chassis 1MO f V chassis 1MOQ f W chassis 1MO f Figure 2 LGE Internal Use Only Part 5 Trouble Shooting pes Title Cause of error Check point amp Normal condition Input voltage error low voltage Check input voltage AC Input current is higher Over load operation Check outdoor fan canstraint screened flow 22 ae than the limit Outdoor fan constraint structure screened blocked Check PCB current sensor parts Burned parts inside PCB A WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Inspecting PCB input current sensing circuit 1 Set Multi tester as DC voltage measurement mode 2 Measure th
62. imer the operation continues While in Fuzzy operation the airflow speed of the indoor fan is automatically selected according to the temperature 6 9 2 Off Timer Operation When the set time is reached after the time is input by the remote control the appliance stops operating The timer LED is on when the off timer is input It is off when the time set by the timer is reached If the appliance is on pause at the time set by the timer the pause continues 6 10 Weekly Program If necessary an operator can make an On Off reservation of the product for a period of one week On Off schedule of operation for a period of ONE week No need to turn the unit On OFF manually during working days On Off time is scheduled in micom of the wired remote control Operation Time Table Example Setting Mon Tue Wed Thu Fri Sat Sun Temp 25 C 25 C 25 C 25 C 25 C On 09 00 08 00 09 00 08 00 09 00 OFF Off 12 00 17 00 12 00 12 00 12 00 Copyright 2014 LG Electronics Inc All right reserved 24 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 11 Two Thermistor Control This is the function to select the temperature sensor to judge the room temperature When pressing the a button and button simultaneously for more than 3 seconds the system will be entered into the installer setting mode After enteri
63. ke air temperature and the setting temperature Notes The Temp of Comp Turn ON and OFF is different in heating mode and fuzzy operation for heating Please refer page 11 6 4 Auto restart Operation Whenever there is electricity failure to the unit and after resumption of the power unit will start in the same mode prior to the power failure Memorized condition are on off condition operating mode cooling heating set temperature and fan speed The unit will memorize the above conditions and start with same memorized condition Copyright 2014 LG Electronics Inc All right reserved 21 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 5 Child Lock Function It is the function to use preventing children or others from careless using 1 During the operation when pressing the a button and button for approx 3 seconds the Child Lock Function can be used At the time of initial setting of the Child Lock the CL Will be indicated approx 3 seconds at the temperature Display section before resuming to the previous mode After the setting of the CL if another button is setup the button can not be recognized as the CL is indicated at the temperature display section for approx 3 seconds If the CL function is wanted to be used under the operation FAN standby state press the SPEED a button and Button for approx 3 seco
64. ly Part 5 Trouble Shooting Display Title Cause of error code Check point amp Normal condition DC Link Voltage is above 420Vdc 23 DC Link High Low Volt DC Link Voltage is below 140Vdc Check CN L CN N Connection Check Input Voltage Check PCB DC Link voltage sensor parts A WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts E Error Diagnosis and Countermeasure Flow Chart Is input voltage normal Is Inverter PCB assembly Power connection normal Is Inverter PCB Normal Recheck power and installation condition Copyright 2014 LG Electronics Inc All right reserved 81 Only for training and service purposes Check L N Voltage is 230V 15 Check connection from terminal block to Inverter PCB assembly CN L CN N Replace inverter PCB assembly LGE Internal Use Only Part 5 Trouble Shooting Check Point 1 Check the WCN_P L P N Connection condition at the Main PCB Refer to outdoor wiring diagram 2 Check the DC Link voltage at not operating 280V T 3 Check the DC Link voltage at Comp operating 340V 1 4 Check DC Link Sensing Signal 2 4 2 8V Refer the Picture B 36k Red Black Vdc CT Sensing Check Point Copyr
65. ly Yes After replacement of outdoor unit main PCB is the system also abnormal Replace corresponding pressure sensor Copyright 2014 LG Electronics Inc All right reserved 95 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display eode Title Cause of error Check point amp Normal condition 51 Over capacity Over capacity Combination Check the indoor unit capacity Check the combination table Model Gross max capacity Max single indoor unit capacity A4UWSGGFAO 48k 24k A8UW54GFA0 73k 36k Check Point CH 51 1 Check the indoor unit capacity 2 Check the combination table Copyright 2014 LG Electronics Inc All right reserved 96 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pained Title Cause of error Check point amp Normal condition Power input AC 230V Outdoor Indoor Title The connector for transmission is disconnected nan Communication poorl The connecting wires are misconnected 53 eodd ROSE The communication line is shorted at GND Indoor gt Outdoor e Transmission circuit of outdoor PCB is abnormal Transmission circuit of indoor PCB is abnormal A warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supp
66. ly after checking the measurement mode of the meter be careful of the short circuits with other parts Check Point 54k 1 Check the input power AC230V Outdoor Indoor unit 1 In e EL CMM m EH UN ON_ at the Main 2 In Case of CH53 Check the Connection gt CN COMM at the Main PCB gt L N at the terminal block 2 Check the communication wires are correctly connected Adjust the connection of wire Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MQ 4 Check the connector for communication is correctly connected 5 If one indoor unit is operated normally outdoor PCB is no problem Check the another indoor unit CH05 is displayed at indoor unit CH53 is displayed at outdoor unit 6 If all indoor unit is displayed CH05 but outdoor PCB not display CH53 Check the CN COM and CN POWER is correctly connected 36k 1 In Case of CH53 Check the Connection gt LN at the terminal block TERMINAL BLOCK Copyright 2014 LG Electronics Inc All right reserved 97 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display Title Cause of error Check point amp Normal condition code Inverter PCB amp Mai EEPROMA 1 EEPROM contact defect wrong insertion nverter ain ccess error i 60 EEPROM check sum error and Check SUM error 2 Different EEPROM Version 3 ODU Inverter amp Main PCB as
67. making sure that the and of battery are installed correctly Reattach the cover by pushing it back into position NOTE Use 2 AAA 1 5volt batteries Do not use rechargeable batteries Remove the batteries from the remote controller if the sys tem is not going to be used for a long time 3 1 2 Precautions in test run E The initial power supply must provide at least 90 of the rated voltage Otherwise the air conditioner should not be operated E For test run carry out the cooling operation firstly even during heating season If heating operation is carried out firstly it leads to the trouble of compres Sor Then attention must be paid E Carry out the test run more than 5 minutes without fail Test run will be cancelled 18 minutes later auto matically E The forced operation is started by pressing button for 2 seconds The test run is started by pressing button for 3 6 sec onds B To cancel the test run press any button 3 1 3 Settlement of outdoor unit E Anchor the outdoor unit with a bolt and nut o10mm tightly and horizontally on a concrete or rigid mount B When installing on the wall roof or rooftop anchor the mounting base securely with a nail or wire assuming the influence of wind and earthquake E In the case when the vibration of the unit is conveyed to the hose secure the unit with an anti vibration rubber Copyright 2014 LG Electronics Inc All right reserved Only for trainin
68. mality found Check wiring between OUD fan motor and Inverter PCB Is wire connection of Check if Hall Senor and Motor output terminal color is ODU Fan Motor wire normal matched gt Reassemble if abnormality found Is connector PCB assembly normal Replace connector PCB assembly Is main PCB assembly normal Replace main PCB assembly Recheck power and installation condition Check Point 1 Check voltage between 1pin and 4pin of Fan Mortor connector Tester diode mode 2 Voltage value should be in 1V 0 2V Copyright 2014 LG Electronics Inc All right reserved 75 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting gt A4UW36GFA0 A8UW54GFA0 posu Title Cause of error Check point amp Normal condition An instant over current in the U V W phase Instant over current amp Ik 21 DC PEAK velut Rated current The abnormal connection of U V W IPM Fault Poor insulation of IPM ter load condition Overcharging of refrigerant Pipe length Outdoor Fan is stop Poor insulation of compressor Ay warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts E Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion 2 Check Covering I
69. mbination Check the cam bination table Model Gross max capacity Max single indoor unit capacity A2UW18GFAO0 24k 18k A3UW24GFAO 33k 24k Check Point CH 51 1 Check the indoor unit capacity 2 Check the combination table Copyright 2014 LG Electronics Inc All right reserved 69 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pes Title Cause of error Check point amp Normal condition No power on indoor unit Indoor outdoor unit Check indoor unit power status Power connection Check indoor outdoor unit If the data transmitted by uds DK i dus error communication power communication line disconnection the indoor unit is not 53 error caused by external Check the status of indoor outdoor unit ground received for 3 minutes continuously noise connections i Indoor outdoor unit com Check if outdoor unit communication parts are munication circuit parts burned burned A WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Copyright 2014 LG Electronics Inc All right reserved Are the power and the operation status of indoor Suit normal Yes Are the power and communication lines connection status ormal2 Ye
70. ment mode Check pipe folding and abnormality 2 Check the short circuit between the oa input signal pins at the IPM SPM3 lower parts in Power off state Remedy remove the cause of error Check compressor constraint Check compressor wire disconnection Is the Compressor open negative phase Normal Check inside wire open short Check inside insulation damage Remedy Rearrange compressor wire disconnections Replace compressor Check PCB compressor connector assembly status Check if PCB IPM burned Check IPM input signal connector short circuit Check the balance of current in the compressor operation phase the difference between each phase current should be within 2A Remedy replace PCB Assembly Copyright 2014 LG Electronics Inc All right reserved 56 Only for training and service purposes LGE Internal Use Only Verifying compressor burn SED 1 Remove the connectors to the PCB 2 Measure the resistance between the lines of each terminal of the compressor Refer to Table 1 3 Measure the resistance between each terminal and the chassis pipe of the compressor Refer to Table 2 4 If the measurements are distinctively different from Table 1 and 2 the compressor is decided to be burned Verifying IPM burn 1 Remove the connectors to the PCB 2 Set Multi tester as Diode voltage measurement mode 3 Measure voltages of P U P V P W as shown in f
71. mote controller Unit ON Cooling Only Operation OFF wate A Indoor Fan Setting step L Low OFF ON d Comp OFF Setting step 6 3 Auto Operation Artificial Intelligence When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed since the operation off 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 lt Inatake Air Temp Fuzzy Operation for Cooling 21 C lt Inatake Air Temp lt 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 sec or longer before Fuzzy operation the mode before Fuzzy operation is operated 6 3 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 set ting temp the compressor is turned off When 0 5 C or more above the setting temp the compressor is turned on Compressor ON Temp gt Setting Temp 0 5 C Compressor OFF Temp gt Setting Temp 0 5 C At the beginning of Fuzzy mode operation the setting temperature is automatically selected according to t
72. n suction grill descends and stops automatically at a certain distance You may stop it at wanted distance point by depressing the stop but ton when descending 3 Raise the Suction Grill Depress the up button 4 Then suction grill goes up and enters into the front panel Automatic stop distance 4 Stop the Suction Grill during Rising Depress the stop button Make use of this when you want to stop it at your wished posi tion Ceiling height Medium Height 3 4 m Automatic stop distance 1 540 5m 2 5 0 5m 3 5 05m If you want to change automatic distance setting consult with your sale agency 7 4 Defrost Control Heating Defrost operation is controlled by timer and sensing temperature of outdoor pipe The first defrost starts only when the outdoor pipe temperature falls below 11 C after starting of heating operation and more than 10 minutes operation of compressor Defrost ends after 15 minutes passed from starting of defrost operation when the outdoor rises over 40 C even before 12 minutes The second defrost starts only when the outdoor pipe temperature falls below 6 C after from ending of the first defrost and more than 10 minutes operation of compressor Copyright 2014 LG Electronics Inc All right reserved 28 Only for training and service purposes LGE Internal Use Only Part 3 Basic Control Part 3 Basic Control 1
73. ndoor Outdoor Unit Is installation condition normal Are the resistance Between each phase and insulation resistance of Inverter compressor normal Is compressor Wire connection condition normal Is inverter PCB assembly normal Yes Recheck power and installation condition E Comp checking method Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found 1 Check resistance between each terminal of compressor 0 438 0 628x7 6 2 Check insulation resistance between compressor terminal and pipe over 2MQ Replace compressor if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality found Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly Resistance Q Terminal Inverter Comp U V 0 628 at 25 C V W___ 0 628 at 25 C W U 0 628 at 25 C U V 0 438 at 25 C V W 0 438 at 25 C W U 0 438 at 25 C Resistance O at 20 C Inverter Constant Terminal comp comp U GND 2MO 2MO V GND 2MO
74. nds under the standby mode state and the system will be the CL state As for the releasing method when pressing the a Button and button for approx 3 seconds the CL function can be released 6 6 Forced operation To operate the appliance by force in case when the remote control is lost the forced operation selection switch is on the main unit of the appliance and operate the appliance in the standard conditions The operating condition is set according to the outdoor temp and intake air temperature as follows tti d of Indoor temp Operating Mode Setting temp x Mice rat over 24 C Cooling 22 C 21 24 C Healthy Dehumidification 23 C High speed below 21 C Heating 24 C The unit select the last operation mode in 3 hours Operating procedures when the remote control can t be used is as follows The operation will be started if the ON OFF button is pressed If you want to stop operation re press the button Copyright 2014 LG Electronics Inc All right reserved 22 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 7 Group Control When installing more than 2 units of air conditioner to one wired remote controller please connect as the right figure If itis not event communication indoor unit set the unit Signal wire as slave Check for event communication through the product manual
75. ng into the installer setting mode select the thermistor sensor setting code value by pressing the button Thermistor sensor selection code value 04 Select the desired setting value with the temperature up A down W button Setting value El 01 Remote FAN D controller 93 02 Indoor unit Code value 03 2TH TEMP v o Gg La When pressing the button currently established thermistor sensor location will be set up When pressing the a button and button simultaneously for more than 3 seconds after the setting has been completed the setting mode will be released If there isn t any button input for more than 25 seconds the installer setting mode will also be released lt Thermistor Table gt Temperature sensor selection Function 01 Remote controller Operation in remote controller temperature sensor 02 Indoor unit Operation in indoor unit temperature sensor Operation of higher temperature by comparing indoor unit s and wired remote Cooling controller s temperature 03 2TH There are products that operate at a lower temperature Operation of lower temperature by comparing indoor unit s and wired remote naa controller s temperature The function of 2TH has different operation characteristics according to the product Copyright 2014 LG Electronics Inc All right reserved 25 Only for training and service purp
76. nk High Volt 2 mes 9 Sumes U amp sc Link Voltis above 420Vde ni 25 Low Voltage Over Voltage 2times 5times Abnormal AC Volt Input Off 26 DC Compressor Position Error 2times 6times Compressor Starting Fall Error Off 27 PSC PFC Fault Error 2times 7times Over Inverter PCB input current Off 29 COMP Over Current 2times 9times Over Inverter Compressor Current Off 32 D Pipe High 3times 2times D Pipe Temp High Off 35 Low Pressure Error 3times 5times 9 Excessive decrease of Low Pressure Off 39 Communication Error 3times Q9 9times Q Sie E MS NICE PFC Off 40 CT Sensor Open Short 4times o CT Circuit Malfunction Off 41 INV D Pipe Th Error 4times 1times Open Short Off 43 High Pressure Sensor Error 4times 3times Open Short Off 44 Outdoor Air Th Error 4times 4times Q9 Open Short Off 45 Cond Mid Pipe Th Error 4times 5times Open Short Off 46 Suction Pipe Th Error 4times 6times Open Short Off 48 Cond Out Pipe Th Error 4times 8times Open Short Off 51 Capacity Over 5times 1times Over combination Off 53 Signal Error Indoor lt gt Outdoor 5times 3times Communication Poorly Off 54 3 Phase Wrong wiring 5times Q 4times a HORIS Phas Off 60 EEPROM Check Sum Error 6times Q e Check Sum Mismatching Off 61 Cond Pipe Th High 6times 9 1times Cond Temp High Off 62 Heaksink Th High 6times 2times Heatsink Temp High Off 65 Heaksink Th Err
77. oor fan constraint screened flow screened blocked Over current on AC gt DC structure converter circuit Whang appicatone e Check Reactor Spec 11A 13mH Heacier Spee Check for PCB internal part burn Burned PCB internal P parts PSC Module A warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Inspecting PCB IGBT part 1 Remove the connectors to the PCB 2 Set Multi tester as Resistance measurement mode 3 Measure Resistance of Gate collector Emitter collector 4 If the measurements are 1MO the parts are decided as burned Check fan locking Remove blockings around heat exchanger Maintain distance between outdoor unit and the wall Check pipe folding and abnormality Check service valve lock Is the unit properly installed Remedy remove cause of error Is the reactor normal Check Reactor spec 1 1A 13mH Remedy replace reactor Check IGBT part resistance measurements at power on standby state gt 1000 1 Is IGBT Part is normal Recheck power and installation condition Remedy replace PCB Assembly Copyright 2014 LG Electronics Inc All right reserved 62 Only for training and service purp
78. or 6times 5times Open Short Off 67 Outdoor BLDC Fan Lock 6times 7times Outdoor Fan is not operation Off 73 PFC Fault Error S W 7times 3times Over Current of Outdoor Unit PFC Off Q A light on the display panel is blink 40 Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 2 Pump Down This function gathers the refrigerant present in the system to ODU Use this function to store refrigerant of system in ODU for leakage or IDU replacement e Procedure E This function start Dip switch setting status of ODU PCB 1 Set the Dip switch as follow after shutting the power source down 2 Reset the power 3 Check that the Red LED of PCB is on during work The indoor unit is operated by force 4 Pump down during forced cooling operation Ay caution 1 Use pump down function within guaranteed temperature range IDU 20 32C ODU 0 40C 2 Make certain that IDU doesn t run with thermo off mode during operation 3 After the compressor is starting operation please complete Pump Down within 4 minutes 4 Pump Down can be stopped The compressor is turned off because of compressor protection In this case reset the power Copyright 2014 LG Electronics Inc All right reserved 41 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 3 Evacuation All amount
79. or Diagnosis and Countermeasure Flow Chart Check ODU Fan Motor assemble condition and fan locking Reassemble or replace if abnormality found Is ODU Fan Motor Assemble condition normal 1 Set the multi tester to diode mode 2 Check voltage between 1pin and 4pin of Fan Motor Is ODU Fan Motor normal 1 0 2V 3 Replace Inverter PCB if abnormality found Check wiring between OUD fan motor and Inverter PCB Is wire connection of Check if Hall Senor and Motor output terminal color is ODU Fan Motor wire normal matched Reassemble if abnormality found Is Inverter PCB assembly normal Replace Inverter PCB assembly Recheck power and installation condition Check Point 1 Check voltage between 1pin and 4pin of Fan Mortor connector Tester diode mode 2 Voltage value should be in 1V 0 2V 3 Do not replacing all of fan motor and PCB at once Check error code again after replacing the abnormal part Fan Motor or PCB first E onm0m0000 Copyright 2014 LG Electronics Inc All right reserved 105 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting gt 36k Check voltage betwen 1pin and 4pin of fan motor p Fan motor connector Tester C uu x Main PCB gt 54k Inverter PCB gt Copyright 2014 LG Electronics Inc All right reserved 106 Only for training and service purposes LGE Internal
80. or training and service purposes Main Components of Lift Grill Lift grill front panel assembly Bolts for installation 4 EA P No 3A00255K Instruction manual Remote Controller for lift grill How to Use Remote Controller As for operation of Remote Controller use it by directing the trans mitter part of Remote Controller to the receiver part of front panel directly under front panel Do not drop it down or into water Or else there is worry about trouble failure Do not press hard the Remote Controller button with nail ball point pen or other sharp substance Or else there is worry about trouble failure In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval Remote Controller operation is infeasible 27 LGE Internal Use Only Part 2 Functions amp Controls How to Operate the Lift Grill ACAUTION Always stop the air conditioner operation for safety before operating lift grill Take heed _ there is worry about dust fall etc when suction grill descends In case when the set automatic stop distance goes wrong check the set value of operation panel and con firm if there is neither obstacle nor mankind When you are not to remove obstacle stop the operation before touching the obstacle 1 Stop the Air Conditioner Operation Automatic Stop Distance of Grill 2 Descend the Suction Grill Depress the down button y The
81. oses LGE Internal Use Only Part 2 Functions amp Controls 7 Special Function amp KIT 7 1 Low Ambient control This Function is for cooling operating in outdoor low temperature If outdoor temperature drops below certain temperature liquid back is prevented by reducing outdoor fan speed It can prevent frosting of evaporator and keep cooling operation Outdoor pipe Outdoor Setting Setting Fan Speed Setting Speed Speed Speed 7 2 Space control Vanes angle can be controlled by pair considering its I l installation environment For example direct drafts can be annoying leading to discomfort and reduced productivity vane control A A g helps to eliminate this problem 4 TS i i Easily controlled by wired remote control Air Flow can be controlled easily regarding any space environment 7 3 Auto Elevation Grille Auto Elevation Grille is automatically down to height q of max 3 1 m So it enables to install the Indoor unit wy O at high ceiling space And Auto Elevation Grille K makes you cleaning the filter easily SLE eazy e Copyright 2014 LG Electronics Inc All right reserved 26 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls B ELEVATION GRILL REMOTE CONTROLLER Accessory Signal transmitter Ascend Descend Copyright 2014 LG Electronics Inc All right reserved Only f
82. oses LGE Internal Use Only Part 5 Trouble Shooting Display Coda Title Cause of error Check point amp Normal condition Compressor Locking Overload operation Outdoor fan constraint screened blocked Burned parts inside PCB IPM Burned PCB phase current sensing circuit parts Check compressor locking Compressor wire open short Check compressor insulation damage Check outdoor fan constraint screened flow structure e Check if IMP burned refer to CH21 Check on PCB current sensing circuit parts Over current at the initial operation of the compres 29 sor location sensing sig nal for compressor opera tion is not input Ay WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Inspecting PCB phase current sensing circuit Check fan locking 1 Set Multi tester as DC voltage measurement Remove blockings around heat mode exchanger 2 Measure at the bel ing point DC Maintain distance between Mas ean ME DS OW Measuring poln outdoor unit and the wall voltages at Power on standby state Check pipe folding and 3 If the measurements are outside DC 2 5V abnormality 0 2V the parts are decided as burned Check service valve lock Is the unit properly installed
83. oving the front panel or cabinet execute short circuit and discharge between high voltage capacitor terminals If discharge is not executed an electric shock is caused by high voltage resulted in a death or injury Do not turn the air conditioner ON or OFF by plugging or unplugging the power plug There is risk of fire or electrical shock OP eoo D 2d s Copyright 2014 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Part 1 General Information Do not use a defective or underrated circuit breaker Use the correctly rated breaker and fuse Otherwise there is a risk of fire or electric shock Install the panel and the cover of control box securely Otherwise there is risk of fire or electric shock due to dust water etc Indoor outdoor wiring connections must be secured tightly and the cable should be routed properly so that there is no force pulling the cable from the connection terminals Improper or loose connections can cause heat generation or fire Do not touch operate or repaire the product with wet hands Hoding the plug by hand when taking out Otherwise there is risk of electric shock or fire Use a vacuum pump or Inert nitrogen gas when doing leakage test or air purge Do not compress air or Oxygen and Do not use Flammable gases Otherwise it may cause fire or explosion There is the risk of death injury fire or explosion
84. ower is abnormal 1 Check L N connection condition Is AC input Wire connection 2 Check wire disconnection and wiring condition normal Reassemble if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Is compressor Wire connection condition normal Is inverter PCB assembly i Check inverter PCB assembly PFCM normality normal Replace inverter PCB assembly Recheck power and installation condition 3 PFCM Moudle checking method D Set the multi tester to diode mode Check short between input signal pin which are placed below PFC Module 8 Replace PCB assembly if it is short between pins d OCES except No 4 5 pins eee eue FEE EA ala QOQQQGQI AAMAS a A caution PFCM module No 4 5 pins are internal short state lt Short Check Point gt Copyright 2014 LG Electronics Inc All right reserved 87 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting prid Title Cause of error Check point amp Normal condition 1 Overload operation Pipe clogging Covering EEV defect Ref over Inverter compressor over Inverter compressor input charge 29 2 Compressor damage Insulation damage Motor current current is over 30A damage 3 Input voltage low 4 ODU inverter PCB ass
85. p plied with separate package 1 2 List of Accessory Device Remark Simple Controller X Function controller X Function Scheduler X AC Ez PQCSZ250S0 AC Smart Il PQCSW320A1E Central Controller Option Kit SD card type PQCSE341A0 PQCSE342A0 ACP Advanced Control Platform PQCPA11A0E PQCPB11A0E AC Manager X P1485 PMNFP14A0 PMNFP14A1 DO Digital Output Kit PQNFPOOTO BNU LONWORKS Gateway PQNFB16A1 Building Network Unit BACnet Gateway PQNFB17BO Y branch Accessory Installation Header branch Accessory Air Guide X ODU Dry Contact X Low Ambient Kit O Logical operation Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes 413 LGE Internal Use Only Part 2 Functions amp Controls 2 Air flow 2 1 Auto swing left amp right By the horizontal airflow direction control key input the left right louver automatically operates with the auto swing or it is fixed to the desired direction N Right Left ae 110 120 2 2 Auto swing up amp down By the auto swing key input the upper lower vane automatically operates with the auto swing or it is fixed to the desired direction Close 110 120 Open 2 3 Chaos swing up down By the Chaos swing key input the upper lower vane automatically operates with the chaos swing or it is fixed
86. p is between compressor on temp and compressor off temp 10 min dehumidification opera tion and 4 min compressor off repeat Compressor ON Temp gt Setting Temp 0 5 C Compressor OFF Temp gt Setting Temp 0 5 C In 10 min dehumidification operation the indoor fan operates with the low airflow speed Copyright 2014 LG Electronics Inc All right reserved 18 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 Convenience Functions amp 6 1 Cooling amp heating Operations 6 1 1 Cooling Mode Operating frequency of compressor depends on the load condition like the difference between the room temp and the set temp frequency restrictions If the compressor operates at some frequency the operating frequency of compressor cannot be changed within 30 seconds not emergency conditions Compressor turned off when intake air temperature is in between x0 5 C of the setting temp limit for three minutes continuously intake air temperature reaches below 1 0 C of the temperature of setting temp Compressors three minutes time delay After compressor off the compressor can restart minimum 3 minutes later 6 1 2 Heating Mode Operating frequency of compressor depend on the load condition The difference between the room temp and set temp frequency restrictions If compressor operates at some frequency the operating frequency of compressor cannot be c
87. perties and store measured data etc Measuring data are room temperature outside temperature suction temperature blow out temperature air velocity air volume voltage current presence of abnormal vibration and noise operating pressure piping temperature As to the structure and appearance check following items JJ Is the circulation of air adequate L Does the romote controller works properly I Is the drainage OK J Is there any error on wiring J Is the heat insulation complete LJ Aren t terminal screws loosened refrigerant and drain piping 1 Is there any leakage of refrigerant M4 118N cm 12kgf cm M5 196N cm 20kgf cm M6 245N cm 25kgf cm M8 588N cm 60kgf cm Copyright 2014 LG Electronics Inc All right reserved 37 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting I3 Part 5 Trouble Shooting 1 Self dlagnosis F netlOr uiisisiceciresin ncs cuin tn eek ee ex niaaa n eov cn vx 39 1 1 pron Indicator CIMA tem M 39 1 2 Error Indicator OUIOGON asssenabbtndb Pa Rb et nant rea nantes 40 2 PUMP DOWN usan apnd pdt xil ad qd iors Ri cules NEAN Ud di RR aa aaa nAn Nanne RA ERE DERE 41 Mutui mM 42 4 Gas Chargihg siidine pott aei kR EE Nun OO CR d Kn PRO OIonKARD RE 43 5 Cycle Pall T 44 6 Electroni ai d NND ETT Eana aa m eaaa E na
88. pply after checking the measurement mode of the meter be careful of the short circuits with other parts Check if EEPROM is missing Is the EEPROM properly Check the status of the EEPROM assembled assembly Replace EEPROM Inspecting Outdoor EEPROM Assembly Status 1 Check the consistency of the EEPROM s direction inserted in the PCB and the EEPROM marking Remedy reassemble EEPROM Replace PCB Assembly EEPROM Direction Check Point Copyright 2014 LG Electronics Inc All right reserved 71 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pes Title Cause of error Check point amp Normal condition Overload operation Outdoor fan constraint screened blocked Check outdoor fan constraint screened flow High temperature in out Outdoor unit heat l structure l 61 exchanger contaminated Check if refrigerant overcharged door Gand Pipe EEV connector displaced Check the status of EEV assembly poor EEV assembly Check the status of sensor assembly burn Poor Cond Pipe sensor assembly burned A WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts Inspecting Cond Pipe Sensor Remove blockings around
89. r Source Check Point gt Copyright 2014 LG Electronics Inc All right reserved 92 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting eee eeeee lt CT Sensing Check Point gt COMP lt U lt Inverter PCB gt lt CT Sensing Check Point gt Copyright 2014 LG Electronics Inc All right reserved 93 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting py Title Cause of error Check point amp Normal condition Open Short 1 Bad connection of thermistor connector 41 D pipe sensor Inverter Soldered poorly 2 Defect of thermistor connector Open Short Internal circuit error 3 Defect of outdoor PCB Open Short 1 Bad connection of thermistor connector 44 Air sensor Soldered poorly 2 Defect of thermistor connector Open Short Internal circuit error 3 Defect of outdoor PCB Condenser Nid pipesens Open Short 1 Bad connection of thermistor connector 45 Sor pip Soldered poorly 2 Defect of thermistor connector Open Short Internal circuit error 3 Defect of outdoor PCB Open Short 1 Bad connection of thermistor connector 46 Suction Pipe sensor Soldered poorly 2 Defect of thermistor connector Open Short Internal circuit error 3 Defect of outdoor PCB Condenser Gatnibesan Open Short 1 Bad connection of thermistor connector 4
90. re p Fidi ame 34 2 Test RUN Flow chart mE T mo aa AAN 35 Bc TeSt RUNING e 36 Part5 Trouble Shooting Guide c ccccccccseseeessneeseeeeeeneeneeeeeeneeeteeesseetennenseeeeeseneeeenses 38 1 Self diagnosis Function xqccciccsc ca riccsteteccteiesicsdewn sete dcdtaie niente 39 2 PUMP DOWN iode pe edt Saeed anf eM v rre a eire asua fim a ante teal EAE EA EEA S 41 SE VACUO RR REMO MRET 42 4 Gas Charging MERE TO ooo o0 de 43 5 Cycle Pal uomo dE UII ML EUM 44 5 Electr nic Parts ausi oot rele ord Evo dpa av ex dpa bx UR bu cU Pu ARANE EENAA 45 Part b Service Orde nsari Dr Oo c preda a eb labs us ei bli um cepe xtd Urt cop rp 110 1 PCB Service Order 5e sor as uH br vu t det cdd Haw tpa br Rl pupa t RD 111 Copyright 2014 LG Electronics Inc All right reserved sfe Only for training and service purposes LGE Internal Use Only H Part1 General Information TloSafety PrecautlonB uoo na pna cece ae 3 2 Model Line II IAE5 Y e0 O A 6 3 Nomenclatulre ureiccisieseersdvi ra Yupade Fl Fla raga t ee ad E vu cbttirk Er EFRE FEE Po tr Er EH FP PR La E M rad RT 9 Copyright 2014 LG Electronics Inc All right reserved 2 Only for training and service purposes LGE Internal Use Only Part 1 General Information 1 Safety Precautions To prevent injury to the user or other people and property damage the following instructions must be followed E Incorrect operation due to ignoring inst
91. ressor outdoor fan is stopped Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange EVA When the sensor circuit for Indoor temperature and connector are in bad connection or are not engaged Compressor Outdoor fan is stopped Check the related circuit of RO2H 12 1K RO1H 1K RO4H 6 2K ROSH 1K CO1H 102 C02H 102 Micom pin No 2 Check the Indoor temperature sensor is disconnected or not about 10K at 25 C l Check the Relay RY PWR RY START for driving Compressor Check the voltage between brown and blue cable of terminal to connect the Outdoor About AC220V 240V Check the related circuit of relay in Outdoor PCB Ass y Check Point Comp ON Comp OFF Between Micom No 19 and GND DC 5V DC OV Between ICO1M No 10 and DC 1V DC 12V GND Turn off main power Check the electrical wiring diagram of Outdoor side Check the open or short of connecting wires between Indoor and Outdoor Copyright 2014 LG Electronics Inc All right reserved 47 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting 6 4 When indoor Fan does not operate Turn off main power Check the connection of CN FAN Check the Fan Motor l Check the Fuse AC250V T2A Check t
92. rror 1 Micom defect Circuit defect 39 Between PFC Micom Between PFC Micom 2 Different Micom S W Version INV Micom and INV Micom 3 ODU inverter PCB assembly damage E Error Diagnosis and Countermeasure Flow Chart Is PFC Micom amp INV Micom S W Program normal Upgrade Micom Program Is Inverter PCB assembly normal Replace inverter PCB assembly Recheck power and installation condition Copyright 2014 LG Electronics Inc All right reserved 91 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pacc Title Cause of error Check point amp Normal condition code e Malfunction of current detection circuit C T Open Short 40 Sensor Error Initial current error Check CT Sensor output voltage 2 5Vdc 5 WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts E Error Diagnosis and Countermeasure Flow Chart Check L N Voltage is 230V 15 Is input voltage normal Is Inverter PCB Normal Replace inverter PCB assembly Yes Recheck power and installation condition Check Point 1 Check the Input Voltage L N gt 230V 10 2 Check Input Voltage Sensor output voltage 2 5Vdc 10 Input Powe
93. ruction will cause harm or damage The seriousness is classified by the follow ing indications A WARNING This symbol indicates the possibility of death or serious injury CAUTION This symbol indicates the possibility of injury or damage to properties only E Meanings of symbols used in this manual are as shown below D Be sure not to do Q Be sure to follow the instruction AN Dangerous Voltage 1 1 Cautions in Repair A WARNING Be sure to disconnect the power cable plug from the plug socket before disas sembling the equipment for a repair Internal components and circuit boards are at main potential when the equipment is connected to the power cables This volt age is extremely dangerous and may cause death or severe injury if come in con tact with it Do not touch the discharging refrigerant gas during the repair work The discharging refrigerant gas The refrigerant gas can cause frostbite Release the refrigerant gas completely at a well ventilated place first Otherwise when the pipe is disconnected refrigerant gas or refrigerating machine oil discharges and it Can cause injury When the refrigerant gas leaks during work execute ventilation If the refrigerant gas touches to a fire poisonous gas generates A case of leakage of the refriger ant and the closed room full with gas is dangerous because a shortage of oxygen occurs Be sure to execute ventilation When rem
94. s Is the grounding connection status normal Yes Is outdoor unit communication circuit normal Yes Check if the indoor unit power is on Check the status of indoor unit normal operation when it is powered on again by remote controller Remedy replace Indoor unit PCB Assembly Check indoor outdoor unit power and communication line connection L amp N status and the status of disconnection misplacement Check the status of outdoor unit grounding connection Check the status of indoor unit grounding connection Check if there is a power line causing noise near indoor outdoor unit power communication lines Recheck power and installation condition Only for training and service purposes 70 Remedy connect grounding and remove cause of error Check the status of outdoor unit communication connector assembly Check the status of outdoor unit power connector assembly Remedy reconnect connectors replace PCB Assembly LGE Internal Use Only Part 5 Trouble Shooting pna Title Cause of error Check point amp Normal condition Outdoor unit PCB Incorrect checksum of out EEPROM misapplied 60 door unit PCB EEPROM Outdoor unit PCB EEPROM assembly EEPROM poor assmbly A warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power su
95. s Refer to the product manual for more detail When simultaneously connecting 2 sets of wired remote controller When controlling in groups set the master slaver of the remote controller Refer to Installer setting section on how to set mas ter slave for more detail Copyright 2014 LG Electronics Inc All right reserved 23 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 8 Sleep Timer Operation When the sleep time is reached after lt 1 2 3 4 5 6 7 0 cancel hr is input by the remote control while in appliance operation the operation of the appliance stops While the appliance is on pause the sleep timer mode 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 indoor fan is set to the medi um 6 9 Timer On Off 6 9 1 On Timer Operation When the 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 input It is off when the time set by the timer is reached If the appliance is operating at the time set by the t
96. s that could cause personal injury Do not block the inlet or outlet of air flow It may cause product failure oo oe CAUTION Check to see if the parts are mounted correctly and wires are connected Improper installation and connections can cause an electric shock or an injury Check the installation platform or frame has corroded Corroded installation plat form or frame can cause the unit to fall resulting in injury Be sure to check the earth wire is correctly connected After the work has finished be sure to do an insulation tset to check the resis tance is 2 Mohm or more between the charge section and the non charge metal section Earth position If the resistance value is low a disaster such as a leak or electric shock is caused at user s side Check the drainage of the indoor unit after the repair If drainage is faulty the water to enter the room and wet floor e 5 ee Copyright 2014 LG Electronics Inc All right reserved 5 Only for training and service purposes LGE Internal Use Only Part 1 General Information 2 Model Line Up 2 1 Indoor units Model names Category Chassis Capacity kW kBtu h Class 2 1 7 2 6 9 3 5 12 4 215 5 3 18 7 03 24 10 6 36 Wall mounted SB AMNWO7GDBL1 AMNWO9GDBL1 AMNW12GDBL1 AMNW15GDBL1 LMNO77HVT LMNOSZHVT LMN127HVT LMN157HVT SC AMN
97. sembly damage A warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts E Error Diagnosis and Countermeasure Flow Chart 1 Check EEPROM insert direction connection condition Is EEPROM insertion normal 2 Check EEPROM Check SUM Replace if abnormality found Is inverter PCB assembly normal Yes Y MAIN PCB assembly normal Recheck power and installation condition Check Point Check the EEPROM Check sum amp Direction Replace inverter PCB assembly Replace MAIN PCB assembly gt 36k EERROM Laus Copyright 2014 LG Electronics Inc All right reserved 98 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting gt 54k a ETE MAIN PCB gt lt EEPROM Direction Check Point Copyright 2014 LG Electronics Inc All right reserved 99 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting pes Title Cause of error Check point amp Normal condition Overload operation Outdoor fan constraint screened blocked Check outdoor fan constraint screened flow eiondemperatire inout Outdoor unit heat structure 61 Pans Pipe exchanger contaminated Check if refrig
98. ster as DC voltage measurement normal mode 2 Measure the measuring point DC voltages at Power on standby state 3 If the measurements are outside DC 2 4 2 8V the parts are decided as burned Remedy inspect repair power board No Measure DC Link voltage at Is the PCB Power Power on standby state part normal DC 280 310V Remedy replace PCB Assembly If measurement of DC Link voltage at Power on standby state is DC 280 310V and DC Link sensed voltage DC 2 4 2 8V Remedy replace PCB Assembly PCB DC Link voltage sensor part normal Recheck power and installation condition DC LINK Copyright 2014 LG Electronics Inc All right reserved 59 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display Coda Title Cause of error Check point amp Normal condition Input voltage is over limited 1 Input voltage abnormal R S T 25 Input Voltage high low value of the product 140V 2 Outdoor unit main PCB assembly damage or less 300V or more input voltage sensing part E Error Diagnosis and Countermeasure Flow Chart Are there any power wire connections normal Check Yes Y R S S T T R phase voltage is 220V 10 Is input voltage normal gt Check connection condition and wiring if power is abnormal 1 Check L N G wiring conditions Rewire them if abnormality found Is main PCB
99. t 2014 LG Electronics Inc All right reserved 30 Only for training and service purposes LGE Internal Use Only Part 3 Basic Control 4 Oil return control E Oil return operation recovers oil amount in compressor by collecting oil accumulated in pipe Each cycle component operates as shown on the below table during oil return operation Outdoor unit Component Starting Running Ending Compressor Normal control Setting value Normal control Fan Normal control Off Normal control EEV Thermo on Normal control Setting value Normal control EEV Thermo off Min Pulse Setting value Min Pulse 4 way valve On Off On Indoor unit Component Starting Running Ending Fan Normal control Off Normal control Defrost signal Off On Off 5 Defrost control P Defrost operation eliminates ice accumulated on heat exchanger recovering performance of heat exchanger Each cycle component operates as shown on the below table during defrost operation Outdoor unit Component Starting Running Ending Compressor Normal control Setting value Normal control Fan Normal control Off Normal control EEV Thermo on Normal control Setting value Normal control EEV Thermo off Min Pulse Setting value Min Pulse 4 way valve On Off On Indoor unit Component Starting Running Ending Fan Normal control Off Normal control Oil return signal Off On Off
100. talling or relocation the unit make sure that no substance other than the specified refriger ant R410A enter the refrigerant circult Any presence of foreign substance such as air can cause an abnormal pressure rise and may result in explosion or injury 43 LGE Internal Use Only Part 5 Trouble Shooting 5 Cycle Part g Trouble analysis 1 Check temperature difference between intake and discharge air and check for the operating current too Case Symptom Supposed Caused Case 1 Temp difference approx 0 C All amount of refrigerant leaked out Current less than 80 of rated current Check refrigeration cycle Case 2 Temp difference approx 8 C Refrigerant leakage Clog of refrigeration cycle Current less than 80 of rated current Defective Compressor Case 3 Temp difference less than 8 C Excessive amount of refrigerant Current over the rated current Case 4 Temp difference over 8 C Normal NOTICE Temperature difference between intake and discharge air depends on room 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 in cooling mode Suction pressure Temperature of Compared with Discharge Air Compared Cause of Trouble Description the normal value with the normal valve Hi D
101. ter PCB assembly IPM normality gt Replace inverter PCB assembly Is inverter PCB assembly normal Yes Recheck power and installation condition lt CT Sensing Check Point gt Copyright 2014 LG Electronics Inc All right reserved 86 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting ae Title Cause of error Check point amp Normal condition 1 Overload operation Pipe clogging Covering EEV defect Ref overcharge eine ee Inverter PCB input 2 Pelea damage Insulation damage Motor nput Instant over zi Current Error erae S OVE NOOA ea 3 Input voltage abnormal L N 9r aus 4 Power line assemble condition abnormal 5 Inverter PCB assembly Damage input current sensing part A warnine Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the meter be careful of the short circuits with other parts E Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found Is installation condition normal Check Is input voltage normal L N phase voltage is 230V 15 Check connection condition and wiring if p
102. to the desired direction CLOSED 110 120 NOTE Some Models are different by swing width and swing pattern Copyright 2014 LG Electronics Inc All right reserved 14 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 2 4 Air flow step Step Discription Indoor fan motor control have 6 steps p LL Very low In heating mode Air volume is controlled SH H Med Low by remote controller LOW LL step is selected automatically in Hot start operation M Med H High SH Super high Auto Chaos wind 2 5 Chaos wind auto wind When Auto step selected and then operated the high medium or low speed of the airflow mode is operated for 2 15 sec randomly by the Chaos Simulation 2 6 Jet Cool Mode Operation While in heating mode or Fuzzy operation the Jet Cool key cannot be input When it is input while in the other mode operation cooling dehumidification ventilation the Jet Cool mode is operat ed 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 Cool mode has the priority When the Jet Cool key is input the upper lower vanes are reset to those of the initial cooling mode an
103. trol Stop Fan Fuzzy control Fuzzy control Stop EEV Super heating Super heating amp Sub cooling Min Pulse fuzzy control fuzzy control x 14 16k Models Frequency that corresponds to each rooms capacity will be determined according to the difference in the tempera ture of each room and the temperature set by the remote controller There are various factors determining the frequency 2 Compressor control Fuzzy control Maintain evaporating temperature Te to be constant on cooling mode and constant condensing temper ature Tc on heating mode by fuzzy control to ensure the stable system performance Fuzzy control start I Target l g Linear control i S I o Min frequency E Stop 0Hz i v 7 Cooling and heating load Inverter linear control as cooling and heating load increasing x 14 16k Models Capacity steps of compressor are decided by summation of capacity code outdoor temp indoor temp step com pensation of temperature difference indoor temp and setting temp 3 EEV Electronic Expansion Vai EEV operates with fuzzy control rules to keep the degree of superheat about 2 3 C at the evaporator outlet status The degree of superheat Tsuction Tevaporation Tsuction temperature at suction pipe sensor C Tevaporation evaporation temperature C x 14 16k Models EEV operates with PI control rules to keep the degree of superheat at the evaporator inlet and outlet status Copyrigh
104. ulti tester as DC voltage measurement Is the unit properly Maintain distance between outdoor mode installed unit and the wall 2 Measure the below measuring point DC Check pipe folding and abnormality voltages at Power on standby state Check service valve lock 3 If the measurements are outside DC 2 5V Remedy remove cause of error 0 2V the parts are decided as burned Check compressor locking Check compressor wire disconnection Is the compressor normal open negative phase Check inside wire open short Check inside insulation damage Remedy Rearrange compressor wire disconnections Replace compressor CheckPCB Comp connector assembly mSS status Is the outdoor unit PCB Check if PCB IPM burned DC LINK IPM normal Check PCB IPM input signal connectors short circuit gt Refer to CH21 trouble shooting method Remedy replace PCB Assembly No ls Check phase current sensing part PCB phase current voltage measurements at Power on Sensing circuit part standby state U V W gt DC 2 5V normal 0 2V Yes Recheck power and installation condition Remedy replace PCB Assembly Copyright 2014 LG Electronics Inc All right reserved 61 Only for training and service purposes LGE Internal Use Only Part 5 Trouble Shooting Display Coda Title Cause of error Check point amp Normal condition Overload operation Outdoor fan constraint Check outd
105. uto Auto X X X X Airflow direction control up amp down Auto Auto Auto Auto X X X Auto swing left amp right O 0 O X X X X Air flow Auto swing up amp down O O O O X X X Airflow steps fan cool heat 6 6 6 6 6 6 5 5 5 4 5 4 3 3 3 3 3 3 3 3 3 Chaos wind auto wind O O O O X X X Jet cool heat 0 0 0 0 0 0 O X XIX XIX XIX Swirl wind X X X O X X X Triple filter Deodorizing X X X X X X X Air purif Ventilation Kit PTVK430 X X X T a a Y Plasma air purifier O O X PTPKQO X X X Allergy Safe filter X X X X X X X Long life prefilter washable anti fung O O O O O O X Drain pump X X X O O O X E S P control X X X X O O O Installation Electric heater X X X X X X N High ceiling operation X X X O X X X Auto Elevation Grille X X X X X X X Hot start O O O O 0 O O Reliability Self diagnosis O O O O O O O Soft dry operation O O O O O O O Auto changeover X X X X X X X Auto cleaning O O O X X X X Auto operation artificial intelligence O O O O O O O Auto Restart O 0 O O O O O Gonveni n Child lock O O O O O O O 06 Forced operation O O O O X X X Group control O O O O O O O Sleep mode O O O O O X O Timer on off O O O O O X O Timer weekly O O O O O X O Two thermistor control O O O O O O O Standard Wired remote controller PREMTB10U Individual Deluxe wired remote controller X X X X X X X zonitrol Simple wired remote controller PQRCVCLOQ PQRCVCLOQW O O O Simple wired remote controller for hotel use X X X X X X X Wireless remot

Multi Air Conditioner SVC MANUAL(General)

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