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System Heat Recovery Outdoor Unit SERVICE MANUAL R410A

1. Heating mode Heating mode Heating mode Slave2 Slave1 Master Co a a j p E tS OO J OE EERENS Ennn Comp failure unit a How pressure Liquid Low pressure How pressure Liquid Low pressure How pressure Liquid Low pressure gas pipe pipe gas pipe gas pipe pipe gas pipe gas pipe pipe gas pipe 1 Close liquid pipe and low pressure gas pipe of the unit for pump out operation 2 Operate pump out 3 Close high pressure gas pipe of unit after completion 4 End pump out 5 Eliminate refrigerant in suction port For eliminate refrigera
2. System Unstable error In case After 45 min operating the system it does not be stable T How to cope with result of refrigerant checking 1 If the temperature is not in guaranteed temperature range the system will not execute refrigerant checking and the system will be OFF 2 Excess of refrigerant 619 After remove the 20 of calculated total refrigerant recharge the refrigerant by using refrigerant auto charging function 3 Scarcity of refrigerant 629 Charge the refrigerant by using refrigerant auto charging function 4 Impossible to judge 639 IF the system is not in order check the other problem except refrigerant Copyright 2008 LG Electronics Inc All right reserved 37 Only for training and service purposes LGE Internal Use Only Functions 4 6 Pump Down This function gathers the refrigerant present in the system to Outdoor unit Use this function to store refrigerant of system in outdoor unit for leakage or indoor unit replacement Close liquid SVC valve of each unit Close high pressure SVC valve of each unit Open low pressure SVC valve of each unit y Outdoor SVC valve setting Main PCB Power Reset SW02B after master unit dip switch No 10 ON Main PCB SWO1V Press the black button KHA All Indoor unit cooling operation Ball valve Flare valve Liquid pipe High pressure gas pipe Ball valve Low pressure gas pipe Satisfy low pressure target
3. Is input voltage normal Is inverter PCB assembly normal Recheck power and installation condition Measuring input voltage Replace inverter PCB assembly Copyright 2008 LG Electronics Inc All right reserved 139 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 1 Overload operation Pipe clog ging Covering EEV defect Ref overcharge 73 HEB 2 Compressor damage Insulation Master 731 input Instant over CUI verter PCB input 3 phase power damage Motor damage rent error Matter of soft Slave1 732 ware current is over 50A peak for 2ms 3 Input voltage abnormal R S T N Slave2 733 4 Power line assemble condition abnormal 5 Inverter PCB assembly damage input current sensing part E Error diagnosis and countermeasure flow chart Copyright 2008 LG Electronics Inc All right reserved Is installation condition normal Is input voltage normal Is AC input wire connection condition normal Is compressor wire connection condition normal Is inverter PCB assembly normal Recheck power and installation condition Only for training and service purposes 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 f
4. 4 Failure of operation mode conver Pressure unbalance between outdoor units 5 sion at slave3 outdoor unit 1 Master outdoor unit constant Comp locking check valve leakage comp dielectric O speed compressor fault break down at master outdoor unit 2 Slave1 outdoor unit constant Comp locking check valve leakage comp dielectric at alle speed compressor fault slave1 outdoor unit 3 Slave2 outdoor unit constant Comp locking check valve leakage comp dielectric at speed compressor fault slave2 outdoor unit 4 Slave3 outdoor unit constant Comp locking check valve leakage comp dielectric at speed compressor fault slave3 outdoor unit Excessive increase of master out Master outdoor unit fan inverter PCB temperature is 1 door unit fan PCB heat sink tem over 95 C perature Excessive increase of slave1 out Slave1 outdoor unit fan inverter PCB temperature is 2 door unit fan PCB heat sink tem over 95 C perature 88 Excessive increase of slave out Slave2 outdoor unit fan inverter PCB temperature is 3 door unit fan PCB heat sink tem over 95 C perature Excessive increase of slave3 out Slave3 outdoor unit fan inverter PCB temperature is 4 door unit fan PCB heat sink tem over 95 C perature Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 100 LGE Internal Use Only Self diagnosis function Display Title Cau
5. No Checking Item Symptom Countermeasure 1 Is how long power on during 1 Power on for 12 hours or more Go to No 2 operation 2 Power on for 12 hours or less Go to No 2 after applying power for designated time 12 hours Does failure appears again 1 The compressor stops andsame Check IMP may fail when starting operation error appears again Method to measure insulation 2 If output voltage of the inverter is Check coil resistor and insula resistance stably output Note tion resistor If normal restart the unit If same symptom occurs replace the compres sor Insulation resistor 2MW or more Coil resistor Figure 1 Inverter Constant Method to measure coil UN 0 3527 Q 1 96 7 resistance V W 0 35 7 Q 1 91 7 Q Comp a W U 0 3547 0 1 99 7 0 3 If output voltage of the inverter is Check the IPM unstable or it is OV If the IPM is normal replace When incapable of using a digi the inverter board tal tester Check coil resistor and insula Figure 2 tion resistor Note Cautions when measuring voltage and current of inverter power circuit Measuring values may differ depending on measuring tools and measuring circuits since voltage current in the power supply or output side of the inverter has no since waveform Especially output voltage changes when output voltage of the inverter has a pattern of pulse wave In addition meas
6. Outdoor SVC valve setting Note 1 Coco 50 l ERA EM Lines were tr vic 0 OF aot Flare valve High pressure gas pipe pani Ball valve Note Low pressure gas pipe f EHH is displayed close gas SVC Valve of all outdoor unit immediately If low pressure descends below 229 kPa the system turns off automatically Close the gas SVC valve immediately A Caution 1 Use pump down function within guaranteed temperature range Indoor unit 20 32 C Outdoor unit 5 40 C 2 Make certain that Indoor unit doesn t run with thermo off mode during operation 3 Maximum operation time of pump down function is 30 min in case low pressure doesn t go down 4 Press black red button during operation to end pump down Indoor unit outdoor unit off cnn EHH El Copyright 2008 LG Electronics Inc All right reserved 38 Only for training and service purposes LGE Intemal Use Only Functions 4 7 Pump Out This function gathers the refrigerant to other outdoor unit and indoor unit Use this function in case of compressor failure outdoor unit parts defect leakage ngh Outdoor SVC valve setting Close liquid SVC valve of each unit Close low pressure SVC valve of each unit Open high pressure SVC valve of each unit Main PCB Power reset after Dip switch setting of outdoor unit SW01B General case No 10 14 ON SW02B Inv Compressor failure No 3 10 14 ON Main PCB Press the black button SW
7. Display Title Cause of error 1 Master outdoor unit subcooling Master outdoor unit subcooling inlet temperature sen inlet temperature sensor error sor open or short 2 Slave1 outdoor unit subcooling Slave1 outdoor unit subcooling inlet temperature sen 11114 inlet temperature sensor error sor open or short 3 Slave2 outdoor unit subcooling Slave2 outdoor unit subcooling inlet temperature sen inlet temperature sensor error sor open or short 4 Slave3 outdoor unit subcooling Slave3 outdoor unit subcooling inlet temperature sen inlet temperature sensor error sor open or short 4 Master outdoor unit subcooling Master outdoor unit subcooling outlet temperature sen outlet temperature sensor error sor open or short 2 Slave1 outdoor unit subcooling Slave1 outdoor unit subcooling outlet temperature sen PAPI outlet temperature sensor error sor open or short 3 Slave2 outdoor unit subcooling Slave2 outdoor unit subcooling outlet temperature sen outlet temperature sensor error sor open or short 4 Slave3 outdoor unit subcooling Slave3 outdoor unit subcooling outlet temperature sen outlet temperature sensor error sor open or short 4 Failure of operation mode conver Pressure unbalance between outdoor units sion at master outdoor unit 5 2 Failure of operation mode conver Pressure unbalance between outdoor units sion at slave1 outdoor unit o 1 5 1 2 3 Failure of operation mode conver Pressure unbalance between outdoor units sion at slave2 outdoor unit
8. Fan motor resistance measuring between each phase Fan motor wire connection Replace fan PCB assembly Copyright 2008 LG Electronics Inc All right reserved 137 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 70 Master 701 Constant speed compres Constant speed compres Slave1 sor CT sensor error sor CT sensor open short 702 Slave2 703 1 Constant speed compressor CT sensor defect E Error diagnosis and countermeasure flow chart Is constant speed compressor CT sensor connection condition normal Recheck power and installation condition Copyright 2008 LG Electronics Inc All right reserved 138 Only for training and service purposes Check constant speed compressor CT sensor wiring condition and locking LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 7V Master Haganas apa ter Micom input voltage isn t 1 Input voltage abnormal T N Bia 1 babad saaan ia within 2 5V 0 3V at initial 2 Outdoor unitinverter PCB damage ba sensor error state of power supply CT sensing part Slave2 713 E Error diagnosis and countermeasure flow chart Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal
9. omission error R S T input power Check power Line connection condition 3 main PCB damage 502 Slave2 503 Display Title Cause of error 4 Omitting connection of R Omitting connection of master outdoor unit power of outdoor unit 50 error 2 Note Omitting connection of slave1 outdoor unit 5 9 T Omitting connection of S 3 power of outdoor unit 23 error Omitting connection of slave2 outdoor unit lOmitting connection of T 4 power of outdoor unt Omitting connection of slave3 outdoor unit main PCB power off Copyright 2008 LG Electronics Inc All right reserved 129 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide E Error diagnosis and countermeasure flow chart Check R S S T T R phase voltage is 380V 10 Is input voltage normal R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Replace Main PCB assembly Is main PCB assembly normal Recheck power and installation condition Measuring input voltage Noise filter wiring Copyright 2008 LG Electronics Inc All right reserved 130 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide rib Error type Error point Main reasons 1 Sum of indoor units capacity is more than va Caa allowable max connecting capacity Note 1 Sum of indoor unit capaci Sum of indoor unit capa
10. C System stop l Frequency down and Max limit 105 C lt Tdis lt 112 C Constant speed compressor On 490 pulse 98 C lt Tdis lt 103 C Liquid injection on Keep state Max limit No frequency up OFF below 100 C 490 pulse Max limit Tdis lt 98 C Pressure control Off 30O Saige Tdis gt 95 C Pressure control Off 10 pulse open 10sec B Indoor unit control Temperature range EEV Tdis 5115 C System stop Emergency 103 C lt Tdis lt 115 C SH control 98 C lt Tdis lt 103 C Tdis lt 98 C Keep current control SH control 3 3 Inverter Protection Control Nomal operation Frequency down System stop AC input current 18A or less 18A or more 20A or more Compressor current 23A or less 23A or less 34A or less amp AC input current is inverter input current except constant speed compressor current Noise filter passed current Copyright 2008 LG Electronics Inc All right reserved 27 Only for training and service purposes LGE Internal Use Only Functions 3 4 Liquid Back Control B Cooling mode Discharge temperature Indoor unit s EEV Tdis lt Tc 12 C SH increasing control Tdis gt Tc 16 C Normal SH control B Heating mode Discharge temperature Outdoor unit s EEV Tdis lt Tc 17 C SH increasing control Tdis gt Tc 18 C Normal SH control 3k The logic starts af
11. OFF OFF Hot gas bypass valve Indoor Unit Component Normal control Starting Normal control Running Normal control Ending Fan Normal control OFF Normal control Thermo on unit EEV Normal control 1200 pulse Normal control Thermo off unit EEV Min pulse 1200 pulse Min pulse Oil return signal OFF B Oil return operation time 3 min for running step ON OFF B Starting condition every 6 hours operate B Oil return process ends if compressor protection control starts Copyright 2008 LG Electronics Inc All right reserved 22 Only for training and service purposes LGE Intemal Use Only 2 1 2 Oil return control on heating mode Outdoor Unit Component Starting Running Functions Ending Inverter compressor 25Hz Setting Value 25Hz Constant speed compressor OFF ON OFF FAN Normal control Normal control Normal control Main EEV Max pulse Max pulse Max pulse Subcooling EEV Normal control Min pulse 100 pulse 4way valve OFF ON ON Hot gas bypass valve Indoor Unit Component Normal control Starting Normal control Running Normal control Ending Fan Normal control OFF Normal control Thermo on unit EEV Normal control 1200 pulse Normal control Thermo off unit EEV Min pulse 1200
12. Slave1 762 error over 780V 2 Fan PCB assembly defect Slave2 763 E Error diagnosis and countermeasure flow chart Check Is input voltage normal R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 4 10 Check connection condition and wiring if power is abnormal Is fan PCB assembly normal Replace fan PCB assembly Recheck power and installation condition Measuring input voltage Noise filter output lower part Noise filter input upper part Copyright 2008 LG Electronics Inc All right reserved 144 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons M ja 1 Overload operation aa 772 Fan over current error Output current is over 5A for 40ms 2 Fan motor defect Slave2 773 3 Fan PCB assembly defect E Error diagnosis and countermeasure flow chart Is installation Check outdoor unit fan motor assemble condition and locking condition normal Reassemble or replace if abnormality found 1 Check resistance between each motor output terminal Are the resistance 16 80 5 at 75 C Between each phase and insulation 2 Check insulation resistance between outdoor unit fan motor terminal U V W and pipe over 100MQ Replace fan motor if abnormality found resistance of motor output terminal normal 1 Check if color of motor output terminal U V W connector matched with
13. Troubleshooting Guide Error No Error type Error point Main reasons 106 1 Overload operation Pipe clogging Covering EEV Master defect Ref overcharge 11 gt 061 F pa 2 Outdoor unit fan motor assemble condition Slave1 kara a lane EB IAN protawtiot Birou nd abnormal Coil disconnection Short Insulation 12 gt 062 over current overheating damage Slave2 3 Fan PCB heatsink assemble condition abnormal lai ag 4 Fan PCB assembly defect E Error diagnosis and countermeasure flow chart Is fan motor assemble Check outdoor unit fan motor assemble condition and locking condition normal Reassemble or replace if abnormality found 1 Check fan motor U V W connector connection condition Is fan motor wire connection Reassemble wire if abnormality found condition normal 2 Check fan motor wire disconnection Replace outdoor unit fan motor if abnormality found 1 Check fan PCB connector condition Is fan PCB assemble gt Reassemble if abnormality found condition normal 2 Check assemble condition between fan PCB and Heatsink gt Reassembleheatsink if abnormality found Replace fan PCB assembly Is fan PCB assembly normal Yes Recheck power and installation condition Fan motor wire connection Fan IPM assemble position B IPM 1 FAN CONTROLLER 2007 01 23 Check assemble condition Check assemble condition Copyright 2008 LG Electronics Inc All right reserved
14. is plugged in e Be careful and avoid personal injury e There are sharp and moving parts that could cause personal injury Avoid a place where rain may enter since the Install the HR unit at a place in which it is not HR unit is for indoor affected by operation mode changing noise e There is risk of property damage failure of prod e Installation within cell such as meeting room etc uct or electric shock may disturb business due to noise i NN A N N N a at Wi Naa SYA IN ft Copyright 2008 LG Electronics Inc All right reserved 10 Only for training and service purposes LGE Intemal Use Only Information Copyright 2008 LG Electronics Inc All right reserved 11 Only for training and service purposes LGE Internal Use Only Model Names i 1 Model Names 1 1 Outdoor U Power Supply 8HP 10HP 12HP 14HP 16HP 18HP 20HP See AA 80LT2 100LT2 120LT2 140LT2 160LT2 180LT2 200LT2 30 380V 60Hz Power Supply 22HP 24HP 26HP 28HP 30HP 32HP 34HP a ee ne 220LT2 240LT2 260LT2 280LT2 300LT2 320LT2 340LT2 30 380V 60Hz Power Supply 36HP 38HP 40HP 42HP 44HP 46HP 48HP a AA 360LT2 380LT2 400LT2 420LT2 440LT2 460LT2 480LT2 30 380V 60Hz Heat Recovery ARUB 1 2 HR Unit Power supply 2 rooms 3 rooms 4 rooms 10 220 240V 50 60 Hz PRHR020 PRHR030 PRHR040 12 Copyright 2008 LG Electron
15. refer electric component part Replace outdoor unit PCB Copyright 2008 LG Electronics Inc All right reserved 156 Only for training and service purposes Replace constant compressor Adjust connection of cables Replace discharge temperature sensor Cables connection between constant compressor and magnetic switch LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 193 Master 11 gt 931 Fan PCB heatsink Heat sink temperature is over 4 Heatsink temperature sensor defect Slave1 12 gt 932 temperature high 957C 2 Fan PCB assembly defect Slave2 13 gt 933 194 Master 11 gt 941 Fan PCB heatsink Slave1 12 gt 942 temperature sensor abnormal Slave2 13 gt 943 CHOI 1 Heatsink temperature sensor defect Open Short 2 Wrong connection of temperature sen sor connector 3 Fan PCB assembly defect Heatsink temperature sensor E Error diagnosis and countermeasure flow chart Is temperature sensor inserted to fan PCB Is temperature sensor attached to heat sink Is terrnperature sensor normal Is fan PCB assembly normal Recheck power and installation condition Copyright 2008 LG Electronics Inc All right reserved 157 Only for training and service purposes Replace fan PCB assembly Fan heat sink connection Check connection of heat sink temperature connector Check connection
16. tn p LP Target o SH Target 249500 S n 0 ti SC Target 267900 aveing p Ion Version ME 0 0 0 Out LEW S2 QC Comp4 Out LEV S3 DC Comps Const CT value a Qccomp5 Qc Comp On ve EEP data Avg Tin DU 220 0 SCLEWS2 WLI DTIC4 5cLEWS3 Lia LIT C6 oay ale Error Number 0 0 ua TCS Dua c7 Hotgas 52 Hotgas 53 Main Slave slave Slave3 ELECICYCLE WD swar s2 D4way s3 Ar 220 00 HP bulb 0 47 30 LP Tdew 1 49 60 a CET ar rit Combination Super Unit ma mao l Refrigerant R410 Ti rx ischarge L x COMM Port 1 MEH aro Discharge R 300 00 HEX Pipe F 220 00 Site name z HEX Pipe B 220 00 installer Tigua 220 00 Phone number SC Pipe in 22000 Date SC Pipe Out 220 00 Postion info Odu PNO U fem Mom SHI Scope EE EE THMMODE REMMODE SSESMNE SHET SPE out puz pus Dus pus Dus puz DUB HI 725 SNR A DUERR a Ready SAVE TO 200778718 Copyright 2008 LG Electronics Inc All right reserved 46 Only for training and service purposes LGE Intemal Use Only Copyright 2008 LG Electronics Inc All right reserved 47 Only for training and service purposes LGE Internal Use Only T DSC MIC AL ONS amende enden Aa am 49 2 P rns FUNCTIONS mama andes NAGA AGING enen waken denkenden eee iksterd den 50 3 DIMENSION DNA NABABAGABAG AGA 51 4 Piping DIAG VAIS umapi AABAN
17. 141 Outdoor unit sub cooling i necter connection Slave1 inlet outlet temperature eae resistance value gt Detective temperature sensor 12 gt 142 sensor error Open Short Slave 3 Defective outdoor PCB 13 gt 143 E Error diagnosis and countermeasure flow chart Check and correct connection Replace sensor Is temperature sensor connector connections are normal Is the value of temperature sensor resistance normal Note1 Replace outdoor unit PCB Note1 Sensor resistance 100 kQover open or 100 Q below short will generate error Note Temperate sensor resistance vary with temperature So compare temperature sensor resistance value according to outdoor unit temperature by referring below table 5 tolerance Air temperature sensor 10 C 20 7kQ 25 C 10kQ 50 C 3 4kQ Pipe temperature sensor 10 C 10kQ 25 C 5kQ 50 C 1 8kQ Copyright 2008 LG Electronics Inc All right reserved 153 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide rik Error type Error point Main reasons 151 1 Wrong operation of 4way valve because of sludge Master etc inflow TN Function error of outdoor FURGNON araro way 2 No pressure difference because of compressor Slave reversing valve in master 12512 4way reversing valve or sl ve outdoor nits failure pang Bike 3 Wrong installation of In outdoor common pipe ave 135513 4 D
18. 28K Q 10 3 Red and black are the measuring terminals of multi tester Copyright 2008 LG Electronics Inc All right reserved 88 Only for training and service purposes LGE Intemal Use Only Checking Method for Key Components 2 6 Fan IPM Checking N 1 Wait until inverter PCB DC voltage gets discharged after the main power switch off 2 Pull out DC connector and U V W fan motor connector connected with fan PCB 3 Set multi tester in resistance mode 4 If the value between P and N terminal of IPM is small 02 or tens KO PCB needs to be replaced IPM dam aged 5 In case the measured value is open hundreds KQ measure resistance mode and the value should be within 35 KO 10 as shown below table 6 If the measured value is different from the value given in the table PCB is needs to be replaced P terminal black N terminal red U terminal red 35K Q 10 Open V terminal red 35K Q 10 Open W terminal red 35K Q 10 Open P terminal red N terminal red U terminal black Open 35K Q 10 V terminal black Open 35K Q 10 W terminal black Open 35K Q 10 3 Red and black are the measuring terminals of multi tester U terminal V terminal W terminal U terminal V terminal W terminal 8 Ei 3 PM 1 FAN CONTROLLER 2007 0 23 U V W connector U V W connector P terminal N terminal N terminal P
19. AANGAL 20 1 2 Compressor COMMON 220k NA GA AA A An 20 1 3 Master and Slave Unit s EEV Control nennen neenennnenenenen 21 2 Special Control aaa NANANA NATN AABANG BANNA NAA 22 2 1 Oil Return Control oraaa ana aaa aa aaaea cecal NANINDIGAN 23 2 2 Detrost Control 5 sssarernrereserrenenerendentetansnkannhineninodonhinendpenenetenienudkereneniesehuheninacannenes 24 2 3 Stopping Operati n AABANG 25 3 Protection Control aaa AANGAL 26 3 1 Pressure Protection Control icccccscctisssecsieesssstccennsnaranscncececcesaeceeecersssesessseresessoenenenens 26 3 2 Discharge Temperature Control ccccceeseeeeeeeeeseeeeeeeeeeenseseeeeeeeeeseeeeeeeeeeeeesseeneees 27 3 3 Inverter Protection Control naaananansnnnnnnnnannennnnnnnene eenen ennnennnnannnnnnnnnenenenee 27 3 4 Liquid Back Control aan ANAN LAKARAN 28 3 5 Phase Detection nsswsnanssesesnserssesssenrnseinsnkeursesendendensenndoandenwikesninisundnnowosnannidenddnodsesdnn 28 3 6 Pressure Swit iy aNG APANG 28 4 Other Con mala AGANE INANG 29 4 1 Initial Sep aNG BABABA PAA 29 4 2 Emergency Operation ns nassersirsven swan annerensn ans sevananiwsedeodnedavandeneendinadnbndnenevantwadndadne 31 4 3 Sensor Checking Funetlon sss osarsiaanncenenadsninde does esdns hans udeddndwan aande dinvokvincude 32 4 4 Refrigerant Auto Charging nnn sannnannnnenenennnnennenenenennnnennnennenannnnnseenennnnnnnnnen 34 4 5 Refrigerant Checking Function nnnnnanneneennennneneneerennnnnnnennensnnnnnsennenrensnnn
20. All right reserved 78 Only for training and service purposes LGE Intemal Use Only Shooting Guide Copyright 2008 LG Electronics Inc All right reserved 79 Only for training and service purposes LGE Internal Use Only Trouble Shooting Guide 1 The Phenomena from Main Component Failure saasasssssssnnnnessnnn 81 2 Checking Method for Key Components 2 1 CoMmpresSsOr trente soy cds aneh nnen deva aa 82 2 2 FaN MOTOT RAANG 83 2 3 Electronic Expansion ValV cccccccesseseeseeeeceeeeseeeeeeeeeeeeeeeeeseneneees 84 2 4 Phase Bridge Diode Checking Method eeen 87 2 5 Inverter IPM Checking Method ccssccecseeecesseeeessseeeesseeeenseneeeseeeees 88 2 6 Fan IPM Checking Method cc cccssseesseeeesseeeesseeeeseeeeeesseeeensnneensseees 89 2 7 UW 1 Chassis 2 Fain viiiccceetccctisicencesetinstiescircceatcenesiesittii tents teeth 89 En 90 3 Self Diagnosis Function annua nn eenn enen en ennnnenenennnnnannnenenennnnn 91 Copyright 2008 LG Electronics Inc All right reserved 80 Only for training and service purposes LGE Intemal Use Only The Phenomena from Main Component Failure E 1 The Phenomena from Main Component Failure The phenomena from main component failure Component Phenomenon Cause Check method and trouble shooting Not operating Motor insulation broken Check resistance between terminals and chassis Strainer clogged Change st
21. Copyright 2008 LG Electronics Inc All right reserved 131 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 1 Power cable or transmission cable is not connected 2 Defect of outdoor main fuse noise filter 3 Defect of outdoor main inverter PCB 52 Main controller of master Master 521 Transmission error between ynit of master unit can t Slave1 522 Inverter PCB gt main PCB receive signal from Slave2 523 inverter controller B Error diagnosis and countermeasure flow chart Is noise filter or fuse normal Yes Replace inverter compressor PCB Re connect transmission cable Is transmission LED Yellow of inverter compressor PCB on Yes Replace noise filter or fuse Is transmission cable connected correctly Yes Is main PCB normal Yes Replace inverter compressor PCB Replace main PCB The method of checking main PCB and inverter compressor PCB If normal transmission LED blinks Transmission connector amp LED in main PCB Transmission connector amp LED in inverter compressor PCB Copyright 2008 LG Electronics Inc All right reserved 132 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide ae Error type Error point Main reasons EN In case main PCB cant 1 Transmission cables are not connected 53 Indoo
22. None swoim swosM swoam Display None ON e Operation Turn No 1 of SWO1M on to address valve 1 AWW C g e Display Existing value saved in EEPROM is displayed in swoim swosm swoam 7 SEG e Operation Set the digit of 10 to the number in group high data E of the wired remote control connected to the corresponding A g indoor unit to the valve 1 by pressing SW03M SWO1M SW04M e Display Digit increasing with the times of pressing tack switch SW03M is displayed in left 7 SEG e Operation Set the digit of 1 to the number in group low data of MEEL the wired remote control connected to the corresponding indoor unit to the valve 1 by pressing SW04M e Display Digit increasing with the times of pressing tack switch SW04M is displayed in right 7 SEG SW01M SW03M e Operation Turn No 1 of SWO1M off to save the address of 5 EE ajajaja valve 1 swoim swoam swoam Display 11 displayed in 7 SEG disappears Above setup must be done for all HR unit valves The valve that is not connected with any indoor unit should be addressed with any other number than used address numbers of the valves connected with indoor units The valves does not work if the address numbers are same Copyright 2008 LG Electronics Inc All right reserved 67 Only for training and service purposes LGE Internal Use Only HR Unit PCB 5 Exa
23. Outdoor PCB failure Replace after checkin Yes p 9 Indoor PCB failure Replace after checking Note1 Transmission from indoor unit is normal if voltage Note 2 If the DC voltage between transmission terminal A B fluctuation 9V 9V exists when checking DC voltage of indoor unit is fluctuate within 9V 9V then of communication terminal between indoor unit and outdoor units transmission from outdoor unit is normal Check if the transmission cable is properly connected Copyright 2008 LG Electronics Inc All right reserved 106 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide el Error type Error point Main reasons Indoor unit outlet pipe Indoor unit outlet pipe Refer to CHO2 06 temperature sensor temperature sensor open error or short ae Error type Error point Main reasons 1 Error developed in transmission between the 09 Indoor unit EEPROM micro processor and the EEPROM on the sur error face of the PCB 2 ERROR due to the EEPROM damage E Error diagnosis and countermeasure flow chart Replace the indoor unit PCB and then make sure to perform auto addressing and input the address of central control Copyright 2008 LG Electronics Inc All right reserved 107 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide E Error diagnosis and countermeasure flow chart Is connector No c t i co
24. Press the black button on the main PCB for2 sec EET ae Refrigerant SW01V auto ae checking LILILI Press the black button for 2 sec after e aa off all a ee of dip switch gt Copyright 2008 LG Electronics Inc All right reserved 32 Only for training and service purposes LGE Intemal Use Only B Sensor Check Error Code Display Functions In case error occurs during sensor checking process error display is as shown below Following contents are displayed one after the other on the main PCB of master outdoor unit Indoor sensor error 319 Outdoor sensor error 309 4 7 5 number of errors is displayed Displaying error content continuously and repeatedly Displaying error content E Indoor unit error display 1 1st and 2nd number represents indoor unit number 2 Last number represents sensor 1 Pipe inlet temperature sensor 2 Pipe outlet temperature sensor 3 Air temperature sensor E Displaying outdoor unit error 1 1st and 2nd number represents error content code 2 Last number represents outdoor unit number 1 Master 2 Slave 1 3 Slave 2 4 Slave 3 Indoor unit number follows auto addressing number e Suotontemperatue e Subcooingpipein e Subcooing pipe out o High pressure sensor Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ex Indoor unit No 2 pipe inlet temperature sensor error ERE En ex
25. Range Error In case that indoor unit or outdoor unit is out of range 2 ing Low Pressure Descent Error In case the system runs at low pressure limit for over 10 minutes 3 EEE Rapid refrigerant inflow In case the liquid refrigerant flows in because of not using designated capil lary assembly 4 EEE Instability Error In case the high low pressure target doesn t get satisfied for some time after the starting operation D Ah caution 1 Guaranteed temperature range Error will occur if temperature is out of range Indoor unit 20 32 C Outdoor unit 0 43 C 2 For refrigerant charging use designated device only Capillary Assem Set 3 Set the Indoor unit wired remote controller temperature sensing mode as Indoor unit 4 Be careful that Indoor unit should not be thermo off Copyright 2008 LG Electronics Inc All right reserved 35 Only for training and service purposes LGE Internal Use Only Functions 4 5 Refrigerant Checking Function 1 This function charges appropriate amount of refrigerant automatically through cycle operation 2 This function judges refrigerant leakage and overcharging 3 It can be used with refrigerant auto charging function Note Main 4 1 In case air temperature is out of guaranteed temperature refrigerant checking function may end PCB Wait for 3 min after power reset p 9 9 y swo1s without performing refrigerant checking Use guaranteed temperature range onl
26. black 0 4V 0 7V Red and black are the measuring terminals of multi tester Caution e Check the electric parts of c box 10 minutes after switching off the main supply and checking DC voltage is discharged Otherwise there is chance of getting electric shock e There is chance of electric shock by charged voltage Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 87 LGE Internal Use Only Checking Method for Key Components 2 5 Inverter IPM Checki CN P1 CN N1 N terminal P terminal U terminal W terminal V terminal Wait until inverter PCB DC voltage is discharged after main power off Pull out CN P1 CN N1 connectors and U V W compressor connector connected with the inverter PCB Set multi tester to resistance mode If the value between P and N terminal of IPM is short 0Q or open hundreds MQ PCB needs to be replaced IPM damaged AA OO N 5 In the measured value with resistance mode should be within 28K Q 10 6 In case measured value is different from the table PCB needs to be replaced PCB damaged P terminal black N terminal red U terminal red 28K Q 10 Open V terminal red 28K Q 10 Open W terminal red 28K Q 10 Open P terminal red N terminal red U terminal black Open 28K Q 10 V terminal black Open 28K Q 10 W terminal black Open
27. conditioner is installed in a small room measures must be taken to prevent the refrigerant concentration from exceeding the safety limit when the refrigerant leaks e Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceed ed Should the refrigerant leak and cause the safety limit to be exceeded harzards due to lack of oxy gen in the room could result Don t use the existing manifold gage for R22 Don t mix and use the R22 pipe and the refrigerant installation appliances that were used until now e Use the manifold gage for high pressure R410A e Mixing the oil of R22 and R410A may cause as possible as for stable refrigerant filling failure of the unit due to hydrolysis RR Copyright 2008 LG Electronics Inc All right reserved 5 Only for training and service purposes LGE Internal Use Only Safety Precautions B Operation Do not damage or use an unspecified power Use a dedicated outlet for this appliance cord e There is risk of fire electric shock explosion or There is risk of fire or electrical shock injury NEA NG AYY LAS ABD Be cautious that water could not enter the Do not touch the power switch with wet product hands e There is risk of fire electric shock or product e There is risk of fire electric shock explosion or damage injury Take care so that children should not ran When the product is soaked f
28. environments e Oil steam sulfuric smoke etc can significantly e It may cause failure of appliance or accident reduce the performance of the air conditioner or damage its parts Copyright 2008 LG Electronics Inc All right reserved 8 Only for training and service purposes LGE Intemal Use Only Safety Precautions Make the connections securely so that the Be sure the installation area does not deteri outside force of the cable may not be applied orate with age to the terminals e Inadequate connection and fastening may gen e f the base collapses the air conditioner could erate heat and cause a fire fall with it causing property damage product failure and personal injury Install and insulate the drain hose to ensure that water is drained away properly based on the installation manual e A bad connection may cause water leakage Be very careful about product transportation e Only one person should not carry the product if it weighs more than 20 kg e Some products use PP bands for packaging Do not use any PP bands for a means of transportation It is dangerous e Do not touch the heat exchanger fins Doing so may cut your fingers e When transporting the outdoor unit suspending it at the specified posi tions on the unit base Also support the outdoor unit at four points so that it cannot slip sideways Safely dispose of the packing materials Turn on the power at least 6 hours before starting o
29. error Indoor unit sensor is open short 06 Indoor unit pipe outlet sensor error E Error diagnosis and countermeasure flow chart Is sensor proper No connecte ie BCB Connect properly to PCB Yes Is the resistance val S Me Soe eee a ug Change the sensor of sensor normal Yes Change the PCB In case the value is more than 100kQ open or less than 100Q short error occurs Refer Resistance value maybe change according to temperature of temp sensor It shows according to criteria of current temperature 5 margin gt Normal Air temp sensor 10 C 20 7KQ 25 C 10kQ 50 C 3 4kQ Pipe temp sensor 10 C 10kQ 25 C 5kQ 50 C 1 8kQ CN ROOM Indoor air temp sensor CN PIPE2 Pipe outlet temp sensor PCRBSTOASOI SI AGABBTVANDBB2 JS 4 CN PIPE1 Pipe inlet temp sensor 6871ATOBBB PTT cs Pm 6871A10363 Measure the resistance of outlet pipe temp sensor Copyright 2008 LG Electronics Inc All right reserved 102 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide ra Error type Error point Main reasons 1 Remote controller failure The remote controller f 03 No transmission between cabled did not receive the sig 2 Indoor unit PCB failure remote controller amp indoor unit nal from indoor unit 3 Connector failure Wrong connection during specific time 4 transmission cable problem E Error diagnosis and co
30. gas valve Open Open Close Keep Liquid valve Close Open 1 2 Starting Control Heating Mode Only If the system is operated in the heating mode all high pressure gas valves are opened 1 3 Valve Control Close Close Mode change timer is calculated as Table 1 and valves are controlled by Mode change timer according to Table 2 Table 1 Mode change timer calculation Previous mode Changing mode Mode change timer Stop or ventilation Cooling or heating 120 sec Cooling mode Heating 180 sec Heating mode Cooling 120 sec Cooling or heating Table 2 Valve control by Operating mode Stop or ventilation mode change timer Mode change H P gas timer valve During heating 60 sec During cooling 0 sec Balancing valve 120 lt timer Keep Close Cooling O lt timer lt 120 Close Open timer 0 Close Close 180 lt timer Keep Close Heating O lt timer lt 180 Close Close timer 0 Open Close O lt timer lt 5 Cooling mode Close Close Stop or ventilation Copyright 2008 LG Electronics Inc Heating mode Low pressure gas valve m Close Timer 0 All right reserved 54 Only for training and service purposes Close LGE Internal Use Only 2 1 Oil Return Defrost Control Component Starting Running Functions Ending Inver
31. indicates the possibility of injury or damage to properties only B Meanings of symbols used in this manual are as shown below N D Be sure not to do Q Be sure to follow the instruction AWARNING E Installation STi Have all electric work done by a licensed Ask the dealer or an authorized technician to electrician according to Electric Facility install the air conditioner Engineering Standard and Interior Wire Regulations and the instructions given in this manual and always use a special circuit e If the power source capacity is inadequate or e Improper installation by the user may result in electric work is performed improperly electric water leakage electric shock or fire shock or fire may result Always ground the product Always intstall a dedicated circuit and breaker e There is risk of fire or electric shock e Improper wiring or installation may cause fire or electric shock Copyright 2008 LG Electronics Inc All right reserved 3 LGE Internal Use Only Only for training and service purposes Safety Precautions For re installation of the installed product Do not install remove or re install the unit always contact a dealer or an Authorized by yourself customer Service Center e There is risk of fire electric shock explosion or There is risk of fire electric shock explosion or injury injury Do not store or use flammable gas or Use the correctly rated breaker or fuse combustibles near th
32. injection valve defect E Error diagnosis and countermeasure flow chart Is the amount of refrigerant normal refer refrigerant part No Yes Is the resistance of discharge No temperature sensor normal Yes Is EEV in outdoor unit normal at heating operation refer electric component part No Yes Does liquid injection corresponded operate normally Yes No Is there pipe strainer etc clogging Yes Replace strainer Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes No Change the amount of Is there pipe crack or trace of leakage refrigerant Charge additive amount Yes Weld reconnect the cracked portion and recharge refrigerant Replace discharge temperature sensor Note1 Resistance value of discharge temperature sensor 10 C 362kQ 25 C 200kQ 50 C 82kQ 100 C 18 5kQ Replace outdoor unit EEV Check liquid injection corresponded Check another components and operation conditions Take measures 122 LGE Internal Use Only Troubleshooting Guide ci Error type Error point Main reasons 1 Defect of high pressure sensor 2 Defect of indoor or outdoor unit fan 34 Error happens 3 Deformation because of damage of refrigerant pipe because of 3 times 4 Over charged refrigerant aya charge pressure of Soro ge ig Aa 6 When blocked aye compressor increa
33. outdoor unit fan DC link high voltage error voltage error 2 Slave1 outdoor unit fan DC link high Slave1 outdoor unit fan DC link high voltage error 7 16 voltage error 3 Slave2 outdoor unit fan DC link high Slave2 outdoor unit fan DC link high voltage error voltage error 4 Slave3 outdoor unit fan DC link high Slave3 outdoor unit fan DC link high voltage error voltage error Copyright 2008 LG Electronics Inc All right reserved 97 Only for training and service purposes LGE Internal Use Only Self diagnosis function Display Title Cause of error 4 Master outdoor unit fan over current Master outdoor unit fan current is over 5A error 2 Slave1 outdoor unit fan over current Slave1 outdoor unit fan is over 5A 77 error 3 Slave2 outdoor unit fan over current Slave2 outdoor unit fan is over 5A error 4 Slave3 outdoor unit fan over current Slave3 outdoor unit fan is over 5A error 1 Master outdoor unit fan hall sensor Master outdoor unit fan hall sensor open or short error 2 Slave1 outdoor unit fan hall sensor Slave1 outdoor unit fan hall sensor open or short 78 error 3 Slave2 outdoor unit fan hall sensor Slave2 outdoor unit fan hall sensor open or short error 4 Slave3 outdoor unit fan hall sensor Slave3 outdoor unit fan hall sensor open or short error 5 1 Master outdoor unit fan start failure Master outdoor unit fan first position sensing failure 5 error o 2 2 Sl
34. sensor error of slave2 out Slave2 outdoor unit PFC CT sensor open or short 3 door unit PFC CT sensor error of slave3 out Slave3 outdoor unit PFC CT sensor open or short 4 l door unit 1 Instant over current Peak of master Instant over current Peak of master outdoor unit PFC outdoor unit PFC 2 Instant over current Peak of slave1 Instant over current Peak of slave1 outdoor unit PFC 7 13 outdoor unit PFC 5 3 Instant over current Peak of slave2 Instant over current Peak of slave2 outdoor unit PFC outdoor unit PFC 2 4 Instant over current Peak of slave3 Instant over current Peak of slave3 outdoor unit PFC outdoor unit PFC 4 Master outdoor unit 3 phase power Master outdoor unit R T phase difference is over 5A 5 unbalance Slave1 outdoor unit 3 phase power Slave1 outdoor unit R T phase difference is over 5A 5 2 lunbal 8 z la4 unbalance 3 Slave2 outdoor unit 3 phase power Slave2 outdoor unit R T phase difference is over 5A unbalance 4 Slave3 outdoor unit 3 phase power Slave3 outdoor unit R T phase difference is over 5A unbalance 4 Master outdoor unit fan CT sensor Master outdoor unit fan CT sensor open or short error 2 Slave1 outdoor unit fan CT sensor Slave1 outdoor unit fan CT sensor open or short 715 error 3 Slave2 outdoor unit fan CT sensor Slave2 outdoor unit fan CT sensor open or short error 4 Slave3 outdoor unit fan CT sensor Slave3 outdoor unit fan CT sensor open or short error 4 Master outdoor unit fan DC link high Master
35. service purposes LGE Internal Use Only Troubleshooting Guide nia Error type Error point Main reasons auto addressing is not done transmission cable is not connected Short circuit of transmission cable Indoor unit transmission circuit failure outdoor unit transmission circuit failure Not enough distance between power and trans mission cable No signal transmission between indoor amp outdoor units 05 Indoor amp outdoor unit transmission error DORBRWN E Error diagnosis and countermeasure flow chart Replace the PCB of indoor unit No displayed error No Is total number of indoor units connected displayed after auto addressing Does all the indor units show same error code CH05 Re connect after check the transmission cable of indoor Yes unit displayed error Note2 END No Check the main power supply at the outdoor units terminal block N Replace outdoor PCB after bi checking Replace TRANS after checking Is outdoor PCB LED blinking Yes Check the insulation of inverter Is main circuit breaker off constant compressor and replace if required Yes yes Check the capacity of main circuit breaker and replace if required Improper connection of power supply cable If all ok Turn on main circuit breaker Main power supply problem to indoor outdoor No Re connect transmission cable terminal block Noe1
36. terminal DC connector Copyright 2008 LG Electronics Inc All right reserved 89 Only for training and service purposes LGE Internal Use Only Checking Method for Key Components Electrolytic capacitor and resistor for voltage distribution 1 Disconnect an terminal of voltage distribution resistor from each DC link electrolytic capacitor 2 Set the multi meter to resistance mode connect the probe to terminal of the capacitor If the estimated resistance value is increase continuously without short value is 0 then the resistor is normal 3 Set the multi meter to resistance mode confirm that the resistance value of the resistor is around 270 kQ Check and replace inferior components Caution In case that the control box is opened and before checking electrical parts it should be checked that the LED 01Y turned off wait 3 minutes after main power OFF otherwise it may cause electrical shock Copyright 2008 LG Electronics Inc All right reserved 90 Only for training and service purposes LGE Internal Use Only Self Diagn Error indicator Self diagnosis function Mi 3 Self Diagnosis Function e This function indicates types of failure in self diagnosis and occurrence of failure for air condition e Error mark is displayed on display window of indoor units and wired remote controller and 7 segment LED of outdoor unit control board as shown in the table e If more than two troubles oc
37. unit 1 Transmission error inverter PCB Failing to receive inverter signal at main PCB of master Main PCB outdoor unit 2 Transmission error inverter PCB Failing to receive inverter signal at main PCB of slave1 Main PCB outdoor unit 5 2 aa a 5 Transmission error inverter PCB Failing to receive inverter signal at main PCB of slave2 3 gt Main PCB outdoor unit 4 Transmission error inverter PCB Failing to receive inverter signal at main PCB of slave3 Main PCB outdoor unit 5 513 4 Transmission error indoor unit gt Failing to receive indoor unit signal at main PCB of out main PCB of outdoor unit door unit o 5 4 Reverse connection of R S T Reverse connection or omitting connection of R S T power of master outdoor unit power of master outdoor unit S 2 Reverse connection of R S T Reverse connection or omitting connection of R S T 5 power of slave1 outdoor unit power of slave1 outdoor unit 5 4 3 Reverse connection of R S T Reverse connection or omitting connection of R S T o power of slave2 outdoor unit power of slave2 outdoor unit 4 Reverse connection of R S T Reverse connection or omitting connection of R S T power of slave3 outdoor unit power of slave3 outdoor unit 5 9 4 Mixing installation of sub outdoor Mixing installation of old sub outdoor unit and New unit slave outdoor unit Inverter PCB EEPROM error of Access error of inverter PCB of master outdoor unit master outdoor unit 5 Inverter PCB EE
38. unit PCB off Is the pipe setting condition satisfied during the operation of indoor unit Confirm that the setting of No 2 3 of SWo2M corresponds with the number of indoor units Display error on outdoor unit PCB Display error on HR unit PCB Reset the power of HR unit PCB Outdoor unit PCB HR HR unit number m Valve number 3 HR unit 200 Confirm the No 5 dip switch of SW03M of outdoor PCB The number of indoor units detected is Outdoor temperature is over 15 C ON displayed for 30 seconds on the outdoor Check the HR unit and indoor unit Outdoor temperature is below 15 C OFF unit PCB after outdoor unit stopped Are the number of indoor units connected to the In case of changing SW03M S W of outdoor unit wiring and displayed one equal outdoor unit reset the power of outdoor unit main PCB Pipe detection error occur after 30 Wait for 3 minutes seconds Press SWO1V of the outdoor unit main Check the installation of pipe of PCB for 5 seconds Completion of auto pipe detection outdoor indoor HR unit Retry auto pipe detection after checking trouble No of HR unit is displayed on 7 SEG of the outdoor unit main PCB 88 is displayed on 7 SEG of the outdoor unit main PCB Incompletion of auto pipe detection It is possible to be generated mode changing noise of heating and cooling which is normal There is no mode changing noise at normal operation Copyright 2008 LG
39. 008 LG Electronics Inc All right reserved 149 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 105 Master 11 gt 051 Transmission error Slave1 Fan PCB Inverter 12 gt 052 PCB Slave2 13 gt 053 1 Wrong connection between Inverter and fan Fan controller didn t receive signal PCB from inverter controller 2 Fan PCB power not supplied 3 Outdoor unit inverter fan PCB defect E Error diagnosis and countermeasure flow chart Is fan PCB transmission 1 Check DC 15V power cable between Inverter PCB and fan PCB LED yellow blinking 2 Check transmission cable between Inverter PCB and fan PCB normally Reconnect or replace wire if abnormality found Is inverter PCB transmission LED yellow blinking normally Check transmission cable between Inverter PCB and fan PCB gt Reconnect or replace wire if abnormality found Fan PCB assembly Is fan PCB assembly normal Recheck power and installation condition Replace inverter PCB assembly Checking 15V input Fan transmission Fan error LED connection Error LED Transmission connector Transmission LED NG amp PMFARTR sk Note Check fan PCB assembly error LED blinking Check 1087 Error Copyright 2008 LG Electronics Inc All right reserved 150 Only for training and service purposes LGE Intemal Use Only
40. 01V All IDU heating operation EIH Ball valve Flare valve Liquid pipe High pressure gas pipe Ball valve f Low pressure gas pipe Satisfy low pressure target Low p gas pipe Note 2 Yes Note 1 ga Low pressure 5 229kpa Pump out completed EN Main PCB SW02Vv Press the black button SWO01V Indoor unit outdoor unit OFF Ly H g gt E 3 Ball valve Power reset after dip switch No 3 10 14 OFF Eri ls Liquid pipe High pressure gas pipe Ball valve Low pressure gas pipe Note If is displayed close gas SVC V V of all outdoor unit immediately If low pressure descends below 229 kPa the system turns off automatically Close high pressure SVC valve immediately A Caution 1 Use pump out function within guaranteed temperature range Indoor unit 10 30 C Outdoor unit 5 40 C 2 Make certain that indoor unit doesn t run with thermo off mode during operation 3 Pump out function takes 2 5 min after compressor start Make certain that indoor unit doesn t run with thermo off mode during operation in case low pressure doesn t go down 4 Press black red button during operation to end pump out Indoor unit outdoor unit off EH gt Ed Copyright 2008 LG Electronics Inc All right reserved 39 Only for training and service purposes LGE Internal Use Only Functions B Example Slave2 outdoor unit invert compressor failure
41. 1 outdoor unit fan IPM S error 5 11 06 8 Slave outdoor unit fan IPM fault Instant over current at slave2 outdoor unit fan IPM 5 3 error O Slave3 outdoor unit fan IPM fault Instant over current at slave3 outdoor unit fan IPM 4 error Master outdoor unit fan DC link Master outdoor unit fan DC link input voltage is under 1 low voltage error 380V Slave1 outdoor unit fan DC link Slave1 outdoor unit fan DC link input voltage is under 2 low voltage error 380V MIO Slave2 outdoor unit fan DC link Slave2 outdoor unit fan DC link input voltage is under 3 low voltage error 380V Slave3 outdoor unit fan DC link Slave3 outdoor unit fan DC link input voltage is under 4 low voltage error 380V Master outdoor unit liquid pipe Liquid pipe temperature sensor of master outdoor unit 1 temperature sensor error is open or short Slave1 outdoor unit liquid pipe Liquid pipe temperature sensor of slave1 outdoor unit ald la 2 temperature sensor error is open or short Slave2 outdoor unit liquid pipe Liquid pipe temperature sensor of slave2 outdoor unit 3 temperature sensor error is open or short Slave3 outdoor unit liquid pipe Liquid pipe temperature sensor of slave3 outdoor unit 4 temperature sensor error is open or short Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 99 LGE Internal Use Only Self diagnosis function
42. 151 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 107 Master 11 gt 071 F d Slave1 Fan DC link low volt 12 072 age error Slave2 13 gt 073 Fan PCB DC link voltage supplied below 380V 1 Wrong wiring between inverter PCB and fan PCB 2 Fan PCB assembly defect E Error diagnosis and countermeasure flow chart Is wiring between fan motor and PCB normal Is DC_link voltage normal Is fan PCB assembly normal Recheck power and installation condition 2 DC_Link Measure DC_link voltage DC voltage connection 1 Check DC_link wire connection Replace wire if abnormality found gt Check inverter PCB if voltage is below 380V Replace fan PCB assembly DC Volt connected Copyright 2008 LG Electronics Inc All right reserved 152 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 113 Master 1 Defective temperature sensor con 11 2181 Outdoor unit liquid pipe Abnormal sensor resistance value ae Slave condenser temperature Open Short 2 Gea aca sensor 12 gt 132 sensor error pen ort Slave2 3 Defective outdoor unit PCB 13 gt 133 Error No Error type Error point Main reasons 114 Master 1 Defective temperature sensor con 11 gt
43. 8 LG Electronics Inc All right reserved Only for training and service purposes 14 LGE Internal Use Only Nomenclature B 4 Nomenclature Serial Number Air Discharge Type S Side Discharge T Top Discharge Electrical Ratings 8 30 380 415V 50Hz 9 30 380V 60Hz A 30 220V 50Hz B 30 220V 60Hz L 30 380 415V 50Hz 30 380V 60Hz Total Cooling Capacity in Horse Power HP unit EX 4 5HP 45 10HP 100 Combination of Inverter Type and Cooling Only or Heat Pump N Inverter and H P V Inverter and C O B Inverter and Heat Recovery Indicates that this is MULTIV System Outdoor Unit using the R410A 4 2 HR Units Serial Number No of Connected Rooms 02 For 2 Rooms 03 For 3 Rooms 04 For 4 Rooms Indicates that this is MULTIV System HR Unit using the R410A Copyright 2008 LG Electronics Inc All right reserved 15 Only for training and service purposes LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved 16 Only for training and service purposes LGE Intemal Use Only r Units Copyright 2008 LG Electronics Inc All right reserved 17 Only for training and service purposes LGE Internal Use Only ARUB Series eFunclonSs BN Copyright 2008 LG Electronics Inc All right reserved 18 Only for training and service purposes LGE Intemal Use Only Functions EO Functions ABASIC COMMON aa AA GAAN 20 TA Normal Operation
44. Electronics Inc All right reserved 65 Only for training and service purposes LGE Internal Use Only HR Unit PCB 3 Flow chart for manual pipe detection Execute in case of auto pipe detection Wait for about 5 minutes failure Tum No 1 of SW02M of HR unit PCB on The number of the indoor units installed is displayed Ex HR wm The number of the indoor Reset the power of HR unit PCB Are the number of indoor units connected to the outdoor unit and displayed one equal Enter the central control address into each indoor unit using its wired remote control Check the central control address of indoor and HR unit YES On the HR unit PCB manually set address of each valve of the HR unit to the central control address of the indoor unit Turn No 6 of SW03M of outdoor unit PCB Make sure that reset the outdoor unit power when changing the central connected to the valve off Turn No 6 of SWO3M of outdoor unit PCB Completion of manual pipe detection on control unit Reset the power of outdoor unit PCB Copyright 2008 LG Electronics Inc All right reserved 66 Only for training and service purposes LGE Internal Use Only HR Unit PCB HR unit e Prerequisite for manual valve addressing central control address of each indoor unit must be preset differ ently at its wired remote control No Display and setup Setup and contents i g g g g g e Operation
45. GAN BAONG 52 5 MING Diagram3 aap NANANAKIT ANA 53 6 FUNCHONS 4GB BANGKA AAAKAGAA 54 Copyright 02008 LG Electronics Inc All right reserved 48 Only for training and service purposes LGE Intemal Use Only E 1 Specifications Specifications Model PRHR020 PRHR030 PRHR040 Max Comnectable No of Indoor units 2 3 4 Nominal input Cooling 26 40 40 Heating 26 40 40 Net Weight kg 19 20 21 lbs 44 1 48 5 52 9 Dimensions Inch 31 5 8 6 24 3 31 5 8 6 24 3 31 5 8 6 24 3 W H D mm 801 218 617 801 218 617 801 218 617 Casing Galvanized steel plate Connecting pipe Indoor Liquid pipe mm inch 09 52 3 8 Gas pipe mm inch 015 88 5 8 Outdoor Liquid mm inch 09 52 3 8 012 7 1 2 012 7 7 8 Low pressure mm inch 022 2 7 8 028 58 1 1 8 028 58 1 1 8 High pressure mm inch 19 05 3 4 022 2 7 8 022 2 7 8 Sound absorbing insulation material Flame and resistant foamed polyetinylene Current Minimum circuit Amps MCA 0 2 Maximum fuse Amps MFA 15 Power supply 10 220 240V 50Hz 10 220V 60Hz Notes 1 Voltage range Units are suitable for sue on electrical systems where voltage supplied to units terminals is not below or above listed range limits 2 Maximum allowable voltage unbalance between phases is 2 3 MCA MFA MCA 1 25 FLA MFA lt 4 FLA Next lower standard fuse rating Min 15A 4 Select wire size based on the MCA 5 Inst
46. Inc All right reserved Only for training and service purposes 70 LGE Internal Use Only Test Run 3 Dip Switch Setting 3 1 Location of setting switch Main PCB SW01B SW02B DIP S W DIP SW co vlam 7 Segment SW02v Auto addressing Copyright 2008 LG Electronics Inc All right reserved 71 Only for training and service purposes LGE Internal Use Only Test Run B Checking according to dip switch setting 1 You can check the setting values of the main outdoor unit from the 7 segment LED The dip switch setting should be changed when the power is OFF 2 It checks whether the input is properly performed without the bad contact of the dip switch or not B Checking the setting of the master unit The number is sequentially appeared at the 7 segment in 5 seconds after applying the power This number represents the setting condition lt For example R410A 3 units gt Master model code gt Slave1 model code gt Slave 2 model code gt Total capacity gt 3 gt 25 gt 180 1 255 Master model code 1 255 Slave1 model code 1 255 Slave2 model code 8 48HP HP number sum of main capacity and sub capacity No display Cooling only 2 Heatpump 3 Heat recovery 25 Normal 110 Tropical 150 R410A normal 170 Space Il 180 Sync Il Ay caution Product may not properly operate if the relevant dip switch is not properly setup Model code Mod
47. Judgment Operation Black button Red button RP 1 time 2 times 3 times 4 times 5 times 6 times 7 times 8 times 9 times 1 2 3 4 5 6 7 8 9 Copyright 2008 LG Electronics Inc All right reserved 43 Only for training and service purposes LGE Internal Use Only Functions Flow Chart en Start condition setting Timer A increase E Timer B increase Timer A gt 10min Yes 0 Timer A Timer B 0 No Timer B gt Setting time Yes Tmax 0 a a AA Start i O Tmaxs0 U UO End condition setting t Timer B 0 4 Timer C increase Timer C 2 Setting time Yes lt lt Step 1 gt RPM_max 510 RPM_max 510 i Q RPM max 510 RPM max 450 Timer A C 0 RPM_max 450 RPM_max 450 RPM_max 400 RPM_max 400 Step 8 RPM_max 400 NN Error Copyright 2008 LG Electronics Inc All right reserved 44 LGE Internal Use Only Only for training and service purposes Functions 4 11 Vacuum Mode This function is used for creating vacuum in the system after compressor replacement outdoor unit parts replacement or indoor unit addition replacement Vacuum mode setting method Outdoor unit power reset Main PCB Master Main PCB Dip switch ON No 11 14 SW02B os Press the black button at the main PCB 5 sec Vacuum mode setting Outdoor unit valve open Main EEV subcooling EEV open Indoor uint EEV open Vacu
48. Manual addressing of valve 3 No 4 Manual addressing of valve 4 SW03M Increase in the digit of 10 of valve address SW04M Increase in the last digit of valve address Copyright 2008 LG Electronics Inc All right reserved 61 Only for training and service purposes LGE Internal Use Only HR Unit PCB 1 Auto addressing for indoor unit 2 Auto pipe detection 3 Manual pipe detection Execute in case of auto pipe detection failure e Turn off all the indoor units before auto addressing If indoor unit is operated auto addressing would not be completed 1 Auto addressing for indoor unit sioi Swoon DIP SW DIP SW Wait 3 minutes after turning on the outdoor unit HR unit indoor unit Press SWO2V of the outdoor unit main PCB for 5 seconds 2 7 minutes are required depending on the number of indoor units connected BE 7 Segment md swo2v Auto addressing The number of the indoor units and HR units connected is displayed at 7 SEG of the outdoor unit main PCB after completion of indoor unit addressing and the address of each indoor unit appears in the window of its own wired remote control Example CHO1 CH02 CH03 CH06 Indoor unit auto addressing is completed 2 Auto pipe detection e Turn No 1 of SWO2M of HR unit PCB off e Confirm that the setting of No 2 3 of SWO2M corresponds with the number of indoor units e Reset the power of HR unit PCB e Turn off the No 5 dip switch o
49. ON ON OFF OFF OFF OFF OFF ON ON ON OFF o2 ON ON ON ON OFF OFF OFF ON ON ON OFF 03 OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF 04 OFF OFF OFF OFF OFF ON ON ON ON ON OFF e Output pulse sequence In valve close state 172 gt 3 gt 4 gt 5 gt 6 gt 7 gt 8 gt 9 gt 10 gt 11 gt 1 In valve open state 11 gt 10 9876543211 1 If EEV open angle does not change all of output phase will be OFF 2 If output phase is different or continuously in the ON state motor will not operate smoothly and start vibrating e EEV valve operation At power ON open angle signal of 1400 pulses out put and valve position is set to If valve operates smoothly no noise and vibration occurs and if valve is closed noise occurs Valve open Angle Noise from EEV can be confirmed by touching the EEV surface with a screw driver and listening the Ful op n EEV noise 1350 pulses Sy me Pa a If liquid refrigerant is in EEV the noise is lower pulse Copyright 2008 LG Electronics Inc All right reserved 84 Only for training and service purposes LGE Intemal Use Only Checking Method for Key Components e EEV coil and body Outdoor unit Coil part Body Lead wire e Remove and assemble the coil Remove Assemble e Grip the A part tightl
50. Outdoor master unit liquid pipe temperature sensor error ERE n__n ex IDU No 2 pipe inlet temperature sensor error and master outdoor unit suction temperature sensor slave 3 high pressure sensor error A Caution 1 Up to 5 number of errors is displayed continuously and repeatedly In case 5 number of errors occurs again perform sensor checking after solving errors 2 IDU in which error occurred operates air circulation mode 33 LGE Internal Use Only Functions 4 4 Refrigerant Auto Charging This function charges appropriate amount of refrigerant automatically through cycle operation It can be used when refrigerant amount Isn t certain because of SVC and leakage 1 After installing the refrigerant charging Main PCB device FFE as shown below in figure open Wait for 3 min after power reset the valve SWO01S 2 In case air temperature is out of guaranteed Main PCB temperature it may end without performing Set the dip switch auto charging Refer Refrigerant charging tim SW01B Refrigerant auto changing 1 2 7 ON 3 Refrigerant charging time may change according SW02B to the charging amount Refrigerant charging time about 3 min kg Main PCB Press the black button on main PCB coe SWO1V Press until 508 is displayed LIL EMEC Press the black butt in PCB SWO1V ress tne piac y on main 5 8 CI HG BT SILO 710 Is it necessary to charge refrigerant Note 1 Press t
51. PCB s 2 Check wire disconnection and wiring gt Reassemble or replace if abnormality found Is motor wire connection condition normal Is Fan PCB assembly normal 1 Check fan PCB assembly IPM normal Replace fan PCB assembly Recheck power and installation condition Measuring fan motor phase Fan motor wire connection resistance Copyright 2008 LG Electronics Inc All right reserved 145 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 79 Master 791 Fan starting failure Slave1 792 error Slave2 793 1 Fan motor defect assemble condition abnor Fan motor initial starting failure mal 2 Fan PCB defect E Error diagnosis and countermeasure flow chart Is fan motor assemble Check outdoor unit fan motor assemble condition and locking condition normal gt Reassemble or replace if abnormality found 1 Check resistance between each motor output terminal Are the resistance V 16 8 Q 5 at 75 C ME ence ar mor GDH 2 Check insulation resistance between outdoor unit fan motor terminal U V W and pipe terminal normal over 100M9 Replace fan motor if abnormality found 1 Check if color of motor output terminal U V W connector matched with PCB s 2 Check wire disconnection and wiring gt Reassemble or replace if abnormality found Is fan motor connection condition normal C
52. PROM error of Access error of inverter PCB of slave1 outdoor unit slave1 unit 6 0 Inverter PCB EEPROM error of Access error of inverter PCB of slave2 outdoor unit 3 stave2 unit Inverter PCB EEPROM error of Access error of inverter PCB of slave3 outdoor unit slaves unit 1 Master outdoor unit fan lock Restriction of master outdoor unit pile 2 Slave1 outdoor unit fan lock Restriction of slave1 outdoor unit 3 Slave2 outdoor unit fan lock Restriction of slave2 outdoor unit 4 Slave3 outdoor unit fan lock Restriction of slave3 outdoor unit Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 96 LGE Internal Use Only Self diagnosis function Display Title Cause of error 1 Constant CT sensor error of master Constant CT sensor open or short of master outdoor unit outdoor unit Constant CT sensor error of slave1 Constant CT sensor open or short of slave1 outdoor unit 2 f 70 outdoor unit 3 Constant CT sensor error of slave2 Constant CT sensor open or short of slave2 outdoor unit outdoor unit 4 Constant CT sensor error of slave3 Constant CT sensor open or short of slave3 outdoor unit outdoor unit 4 PFC CT sensor error of master out Master outdoor unit PFC CT sensor open or short door unit 2 PFC CT sensor error of slave out Slave1 outdoor unit PFC CT sensor open or short 71 door unit PFC CT
53. Short 43 f Abnormal value of 1 Bad connection of high pressure connector za pa Ka ge sensor 2 Defect of high pressure connector Open Short ae 493 pa Open Short 3 Defect of outdoor PCB B Error diagnosis and countermeasure flow chart Is sensor connected to PCB correctly After replacement of outdoor unit main PCB is the system normal Connect sensor to PCB correctly Replace corresponding pressure sensor Low pressure sensor High pressure sensor Copyright 2008 LG Electronics Inc All right reserved 127 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide rror No rror type rror poin ain reasons E N E typ E point Mai ad A Master 441 Sensor error of nonnen 1 Bad connection of air temperature connector Slave1 442 outdoor air temper sensor Open Short 2 Defect of air temperature connector Open Short Slave2 443 ature R 3 Defect of outdoor PCB 45 Master 4514 Piping temperature Slave1 452 a error of heat 1 Bad connection of air temperature connector Slave2453 Een Abnormal value of 2 Defect of air temperature connector Open Short 48 Higa a OHF sensor 3 Defect of outdoor PCB Master 484 door unit heat Open Short as exchanger A B Slave1 482 Slave2 483 46 Master 461 Compressor suc Ab al f 1 Bad connection of air temperature connector Slave1 462 tion temperature rb hee rt 2 Defect of air temp
54. Wo2M ON OFF 5 gt o HAD SC OUT SI SC_IN O LIQUID Li CNO3 AC TRANS OUT MAIN POWER PPLY SU IN 220V 50Hz TO INDOOR UNIT FIELD WIRING FACTORY Solenoid valve 01L H For room1 Solenoid valve 02L H For room2 Solenoid valve 03L H For room3 Solenoid valve 04L H For room4 Solenoid valve 01 Bypass for room1 Solenoid valve 02 Bypass for room2 Solenoid valve 03 Bypass for room3 Solenoid valve 04 Bypass for room4 Solenoid valve bypass CN16 SC Out Sub cooling EEV Sensor sub cooling out CN16 SC In Sensor sub cooling in CN18 Liquid SWO1M Sensor liquid receiver Solonoid valve number Setting When manual address SWO2M 1 Selecting auto address or manual address 7 SWO2M 2 3 Setting total number of indoor connected SW03M Setting the address of indoor 10 When manual address SW04M Setting the address of indoor 1 When manual address SW05M Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes Setting HR unit number 53 LGE Internal Use Only Functions 1 Ba 1 1 Normal Operation Actuator E 6 Functions Cooling Power on 8 operation Heating Stop state operation High pressure gas valve Close Close Open Keep After 30 sec Low pressure
55. apacity and rating such as preserving foods works of art etc It is a consumer air conditioner not a precision refrigeration system e Cables that are too small may leak generate e There is risk of damage or loss of property heat and cause a fire ng Copyright 2008 LG Electronics Inc All right reserved 7 Only for training and service purposes LGE Internal Use Only Safety Precautions Keep the unit away from children The heat When installting the unit in a hospital com exchanger is very sharp munication station or similar place provide sufficient protection against noise e t can cause the injury such as cutting the finger 8 The inverter equipment private power generator Also the damaged fin may result in degradation high frequency medical equipment or radio com of capacity munication equipment may cause the air condition ty er to operate erroneously or fail to operate On the S ON other hand the air conditioner may affect such fp equipment by creating noise that disturos medical i treatment or image broadcasting B Do not install the product where it is exposed to sea wind salt spray directly e It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause product malfunction or inefficient operation ZN CM UA Nag Ar 7 PAIA ar A B Operation Do not use the air conditioner in special Do not block the inlet or outlet
56. ave1 outdoor unit fan start failure Slave1 outdoor unit fan first position sensing failure D 79 error 3 Slave2 outdoor unit fan start failure Slave2 outdoor unit fan first position sensing failure 5 error 5 4 Slave3 outdoor unit fan start failure Slave3 outdoor unit fan first position sensing failure 6 error 4 Master outdoor unit main PCB EEP Communication fail between master outdoor unit main ROM error MICOM and EEPROM or omitting EEPROM 2 Slave1 outdoor unit main PCB EEP Communication fail between slave1 outdoor unit main 86 ROM error MICOM and EEPROM or omitting EEPROM 3 Slave2 outdoor unit main PCB EEP Communication fail between slave2 outdoor unit main ROM error MICOM and EEPROM or omitting EEPROM 4 Slave3 outdoor unit main PCB EEP Communication fail between slave3 outdoor unit main ROM error MICOM and EEPROM or omitting EEPROM 1 Master outdoor unit fan PCB EEP Communication fail between master outdoor unit fan MICOM ROM error and EEPROM or omitting EEPROM 2 Slave1 outdoor unit fan PCB EEP Communication fail between slave1 outdoor unit fan MICOM 8 7 ROM error and EEPROM or omitting EEPROM 3 Slave2 outdoor unit fan PCB EEP Communication fail between slave2 outdoor unit fan MICOM ROM error and EEPROM or omitting EEPROM 4 Slave3 outdoor unit fan PCB EEP Communication fail between slave3 outdoor unit fan MICOM ROM error and EEPROM or omitting EEPROM Copyright 2008 LG Electronics Inc All right reserved 98 Only for training and
57. bber caps put on the suction and discharge pipe of the new compressor to release the sealing nitrogen gas Take note that oil may spout due to the pipe inside pressure if the plug put on the equalizing seat is removed before removing of rubber cap 8 Fasten equalizing pipe with nut 14 18N m 9 Braze the suction and discharge pipe with brazing torch to the compressor Cut section 10 Conduct air tight test to check the piping system is free from leakage 11 Connect power cable to the terminal board of compressor and cover the compressor with sound insulator mat 12 Conduct vacuum drying Since the setting on out door unit PCB is required for vacuum drying refer to the warning plate recautions in service work attached on the switch box cover 13 Charge refrigerant after the completion of vacuum drying and check the function of compressor with cooling or heating operation Copyright 2008 LG Electronics Inc All right reserved 77 Only for training and service purposes a En zzz be PK mat 63 3 H B AS TA _ Discharge pipe Suction pipe Oil return pipe Equalizing seat outlet LGE Internal Use Only Copyright 2008 LG Electronics Inc
58. ci 2 Wrong connection of transmission capacity capacity specification 3 Control error of slave outdoor unit dip switch 4 Power supply defect of slave unit PCB 5 Defect of outdoor unit PCB E Error diagnosis and countermeasure flow chart Is capacity sum of indoor units less than 130 of outdoor unit capacity at LGMV Are quantity and capacity Check transmission cables of indoor units installed between indoor and outdoor same as the data of LGMV units Yes Adjust the capacity of indoor and outdoor unit Adjust corresponding DIP switch Check following dip switch setting is on Slave1 No 5 7 Slave2 No 6 7 Slave3 No 5 6 7 Is power of Slave PCB On Check LED blinking Supply main power again Is main power really supplied Terminal Block T N Check and replace PCB line fuse transformer Is transmission Cables between outdoor units connected correctly Note1 Re connect Is error code released in order Slave2w Slave 1wMaster after power reset Replace Master or Slave PCB Note1 Ratio of the running indoor units to the outdoor Within 10 100 A combination operation over 100 cause to reduce each indoor unit capacity B Combination Ration 50 200 Outdoor number Connection capacity Single outdoor units 200 Double outdoor units 160 Triple outdoor units 130
59. condition of heat sink and temperature sensor Check connection condition Check heat sink temperature sensor wire disconnection Checking temperature sensor disconnection gt Measure temperature sensor resistance 10kQ 5 at 25 C gt Replace the sensor if abnormality found LGE Internal Use Only Troubleshooting Guide De Error type Error point Main reasons 1 HR units power cable or transmission cable connection After the auto operation defect if the number of the 2001 2 After auto addressing wrong address setting of the A indoor units detected is l POSA ae Master Pipe detection error different from the number indoor unit Defective indoor power transmission error and PCB defect Wrong setting of the HR unit s rotary switch or dip switch 4 HR unit PCB defect 21 001 communicating indoor unit oo HR Heat Recovery E Error diagnosis and countermeasure flow chart 1 Check the periodic blinking of the HR unit s green LED transmission LED 2 When green LED transmission LED of HR unit blinks regularly 2 1 Check input power of HR unit 220V 10 2 2 After reset of power of outdoor wait for more than 30 minutes temperature of pipes will be cool down then do auto addressing 2 2 While power of HR unit is on check total indoors display CHO5 or not Refer to CH05 3 When green LED transmission LED of HR unit blinks regularly Check setting of rotary swi
60. cur simultaneously lower number of error code is first displayed e After error occurrence if error is released error LED is also released simultaneously Error display 1st 2nd LED of 7 segment indicates error number 3rd LED indicates unit number Ex 211 No 21 error of master unit 213 No 21 error of slave2 011 gt 051 No 105 error of master unit Display Title Cause of error O 1 Airtemperature sensor of indoor unit Air temperature sensor of indoor unit is open or short O 2 Inlet pipe temperature sensor of indoor unit Inlet pipe temperature sensor of indoor unit is open or short o 3 Transmission error wired remote controller Failing to receive wired remote controller signal in indoor unit PCB indoor unit o 5 0 4 Drain pump Malfunction of drain pump Y losl Transmission error outdoor unit gt indoor Failing to receive outdoor unit signal in indoor unit PCB 2 unit 2 0 6 Outlet pipe temperature sensor of indoor unit Outlet pipe temperature sensor of indoor unit is open or short O 7 Different operation mode Operation mode between indoor unit and outdoor unit is different 5 os Serial No In case when the serial number marked on 9 i EEPROM of Indoor unit is 0 or FFFFFF ilo Poor fan motor operation Disconnecting the fan motor connector Failure of indoor fan motor 7 lock sla Transmission error indoor unit gt mai
61. door temperature sensors 2 outdoor pressure sensors It is used for judging sensor abnormality note 2 Note 1 Sensor checking function is used with Refrigerant Checking and Refrigerant Auto Charging 2 Check abnormal sensor t 3 It is displayed at the LED on the main PCB at each step Main PCB Wait for 3 min after power 4 Refer to the next page for sensor error code part SW01S reset v A Caution Main PCB Set the dip switch according to the function SW01B Sensor checking Refrigerant auto charging 1 2 7 ON Swo2B Sensor checking Refrigerant checking 1 2 7 14 ON 1 Confirm auto addressing has been performed Check installed number of indoor unit 2 The error can be displayed even if the sensor is normal according to installation and temperature condition If error occurs check the sensor and judge abnormality Don t perform sensor checking Would you perform the sensor checking No Yes Note 3 Main PCB alay Press the black button for 2 sec on main PCB 08 Refrigerant auto charging Refrigerant checking EEE Press the black button Press the black button until 508 is displayed until 608 is displayed Indoor Outdoor units operate with IND ENE air circulation mode Cue 4 ceh Judging sensor normality v NG Note 4 Main PCB LED Efrordisplay maa ENE Man Pop Press the black button on the main Press the black button on the main PCB for 2 sec for 2 sec
62. door unit inverter com Master outdoor unit inverter compressor CT sensor pressor CT sensor fault open or short 2 Slave1 outdoor unit inverter com Slave1 outdoor unit inverter compressor CT sensor 4 0 pressor CT sensor fault open or short 3 Slave2 outdoor unit inverter com Slave2 outdoor unit inverter compressor CT sensor pressor CT sensor fault open or short 4 Slave3 outdoor unit inverter com Slave3 outdoor unit inverter compressor CT sensor pressor CT sensor fault open or short Master outdoor unit inverter com Master outdoor unit inverter compressor discharge 1 pressor discharge temperature temperature sensor open or short sensor fault Slave1 outdoor unit inverter com Slave1 outdoor unit inverter compressor discharge 2 pressor discharge temperature temperature sensor open or short sensor fault 4 1 at NN Slave2 outdoor unit inverter com Slave2 outdoor unit inverter compressor discharge 3 pressor discharge temperature temperature sensor open or short sensor fault Slave3 outdoor unit inverter com Slave3 outdoor unit inverter compressor discharge 5 4 pressor discharge temperature temperature sensor open or short 5 sensor fault 4 Master outdoor unit low pressure Master outdoor unit low pressure sensor open or short s sensor fault 2 2 Slave1 outdoor unit low pressure Slave1 outdoor unit low pressure sensor open or short sensor fault 5 4 2 3 3 Slave2 outdoor unit low pressure Slave2 outdoor unit low pressure sen
63. e air conditioner e There is risk of fire or failure of product e There is risk of fire or electric shock Prepare for strong wind or earthquake and Do not install the product on a defective install the unit at the specified place installation stand e Improper installation may cause the unit to top e t may cause injury accident or damage to the ple and result in injury product When installing and moving the air condition Do not reconstruct to change the settings of er to another site do not charge it with a the protection devices different refrigerant from the refrigerant specified on the unit elf a different refrigerant or air is mixed with the e f the pressure switch thermal switch or other original refrigerant the refrigerant cycle may protection device is shorted and operated malfunction and the unit may be damaged forcibly or parts other than those specified by LGE are used fire or explosion may result OD OO ct R410A R22 NN Ee R407C VEE i Copyright 2008 LG Electronics Inc All right reserved 4 Only for training and service purposes LGE Intemal Use Only Safety Precautions Ventilate before operating air conditioner Securely install the cover of control box and when gas leaked out the panel e It may cause explosion fire and burn e f the cover and panel are not installed securely dust or water may enter the outdoor unit and fire or electric shock may result If the air
64. ead of fuse use circuit Copyright 2008 LG Electronics Inc All right reserved 49 Only for training and service purposes LGE Internal Use Only Parts Functions E 2 Parts Functions Parts name Symbol Major function Low pressure gas pipe LPGV Pipe for low pressure gas High pressure gas pipe HPGV Pipe for high pressure gas Liquid pipe 1 LP1 Liquid pipe connected with outdoor unit Liquid bypass valve LBV Prevent liquid charging Solenoid assembly 1 2 SOL1 2 Control the path for heating or cooling Liquid pipe 2 LP2 Liquid pipe connected with indoor unit Gas pipe GSP Gas pipe connected with indoor unit Balancing valve BLV Control the pressure between High and Low pressure pipe during operation switching Subcooling EEV SCEEV Control the subcooling Liquid pipe1 Low pressure gas pipe High pressure gas pipe Subcooling EEV Balancing valve Gas pipe Liquid pipe2 Liquid bypass valve Solenoid assembly 1 Solenoid assembly 2 Copyright 2008 LG Electronics Inc All right reserved 50 LGE Internal Use Only Only for training and service purposes Dimensions a 3 Dimensions 3 1 HR Units 480 137 eid a Unit mm PRHR020 PRHR030 a PRHRO40 Copyright 2008 LG Electronics Inc All right reserved 51 Only for training and service purposes LGE Internal Use Only Piping Diagrams E 4 Piping Diagrams Low press
65. eck power and installation condition Inverter EEPROM inserting point x N NON m a ji i gt Note Replace after power off 136 Copyright 2008 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Troubleshooting Guide rik Error type Error point Main reasons 67 a 1 Fan motor defect assembly condition Master Fan RPM is 10RPM or less abnormal 671 for 5 sec when outdoor 2 Wrong connection of fan motor connector Slave1 FASEREN unit fan starts or 40 RPM Hall sensor U V W output 672 or less after fan starting 3 Reversing rotation after RPM target apply Slave2 4 Fan PCB assembly defect 673 E Error diagnosis and countermeasure flow chart Check outdoor unit fan motor assemble condition and fan locking Is outdoor unit fan motor assemble condition normal 1 Check resistance between each phase U V W of outdoor unit fan motor terminal 16 8Q 5 at 75 C Is outdoor unit fan motor normal 2 Check insulation resistance between outdoor unit fan motor terminal U V W gt Replace fan motor if abnormality found Check wiring between outdoor unit fan motor and fan PCB Is wire connection of Check if hall senor and motor output terminal color is outdoor unit fan motor wire normal matched gt Reassemble if abnormality found Is fan PCB assembly normal Recheck power and installation condition
66. eeeeeeeeeeeeeeeeeeeeeeeeeeeees 68 Test RUM ANAKAN ANTE KNB 69 1 Checks Before Test RUN aaa KABABA naait aina 69 2 How to Cope with Test Run Abnormality aanne eeen eneneneneeenennnnnnnneneerenn 70 3 Dip Switch Setting ceciiciesta wi cticensascevindadaciassedwemiasdantiawevastuausgandutudisaassaducdenudavbenendautun 71 4 Dip Switeh Setting sareei eenderde nnee AKA dend deon randen aaiae aN 72 Replacement Procedure for Compressor ARUB80LT2 to ARUB480LT2 76 Copyright 2008 LG Electronics Inc All right reserved 57 Only for training and service purposes LGE Internal Use Only HR Unit PCB 4 valve housing 1 valve housing 1 cooling valve LED green ee 0o Me 1 heating valve ar A f fi 4 4 3 Gp SH i 7 566 Switch for 7 ao ey SWO1M Dip switch tor setup of Sich or NGA ah the function of HR unit SWOSM SWo4M gt desno 1 Main function of SW02M ON switch Selection No 1 Method for addressing valves of an HR unit Auto Manual No 2 Model of HR unit No 3 Model of HR unit No 4 Valve group setting No 5 Valve group setting No 6 Valve group setting No 7 Use only in factory production preset to OFF No 8 Use only in factory production preset to OFF 1 Selection of the method for addressing valves of an HR unit Auto Manual Copyright 2008 LG Electronics Inc All right reserved 58 Only for training and service purposes LGE Inte
67. efect of 4way valve E Error diagnosis and countermeasure flow chart Is 4 Way valve connecter connection are properly connected No Reconnect it Yes Is 4 Way valve coil No resistance normal Note1 Change 4 Way valve coil Yes Is 4 way valve coil connected No to 4 way valve normally Note2 Re insert 4 way valve coil Yes In case of more than 2 units does master outdoor unit recognize as more than 2 units Note3 No Refer to CH 51 amp make measure Yes After reset can we check supply voltage at PCB when starting heating mode operation Note4 No Replace outdoor unit PCB Yes No Check and replace compressor magnet switch corresponding PCB refer electric component part Is compressor working normally Yes After opposite mode operation to present mode is the same error occurred again No If the same error is occurred in near future replace 4way valve Yes Replace 4 way valve Note5 Copyright 2008 LG Electronics Inc All right reserved 154 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide Note1 Measure the resistance of 4way valve Location of 4way valve connector on main PCB marked as 4way CN09 Note2 Confirm the 4way valve coil is inserted to the end Note4 Check the output voltage of terminal socket during heating operation Note3 When power is su
68. el code Unit HP Unit Ref 190 8 191 10 Master 192 12 or RATOA 193 14 slave 194 16 Copyright 2008 LG Electronics Inc All right reserved 72 Only for training and service purposes LGE Internal Use Only Test Run E Setting the dip switch SW03M e Set the dip switch with the power turned off If you change the setting when the power is on the changed setting is not applied immediately The changed setting is applied at the moment that the power is on e Instant indoor unit checking data display mode and forced oil collecting operation are used when theunits are running If you don t have to use those functions after using them restore the dip switch setting 1 Settings of main outdoor unit Function SWO1B setting SW02B setting Standard Short pipe length Long pipe length Longest pipe length Refrigerant auto charging Refrigerant checking Indoor unit forced operation Cooling Indoor unit forced operation Heating Copyright 2008 LG Electronics Inc All right reserved 73 Only for training and service purposes LGE Internal Use Only Test Run Forced defrosting Snow Forced defrosting Outdoor unit fan low static pressure compensation Outdoor unit fan high static pressure compensation Night low noise Pump down Pump out Forced oil return Vacuum mode Copyright 2008 LG Electronics Inc All right reserved 74 Only for training and service purpose
69. er outdoor unit pressor DC link low voltage after starting relay turn on 2 Slave1 outdoor unit inverter com DC charging is not performed at slave1 outdoor unit 2 3 pressor DC link low voltage after starting relay turn on 3 Slave2 outdoor unit inverter com DC charging is not performed at slave2 outdoor unit pressor DC link low voltage after starting relay turn on 4 Slave3 outdoor unit inverter com DC charging is not performed at slave3 outdoor unit pressor DC link low voltage after starting relay turn on 4 Master outdoor unit high pressure System is turned off by master outdoor unit high pres switch sure switch 2 Slave1 outdoor unit high pressure System is turned off by slave1 outdoor unit high pres 24 switch sure switch 3 Slave2 outdoor unit high pressure System is turned off by slave2 outdoor unit high pres switch sure switch 4 Slave3 outdoor unit high pressure System is turned off by slave3 outdoor unit high pres switch sure switch 4 Master outdoor unit input voltage Master outdoor unit input voltage is over 487V or below high low voltage 270V 2 Slave1 outdoor unit input voltage Slave1 outdoor unit input voltage is over 487V or below 215 high low voltage 270V 5 3 Slave2 outdoor unit input voltage Slave2 outdoor unit input voltage is over 487V or below ka high low voltage 270V 2 4 Slave3 outdoor unit input voltage Slave3 outdoor unit input voltage is over 487V or below D high low voltage 270V 1 Master outdoor
70. erature connector Open Short Slave2 463 sensor error p 3 Defect of outdoor PCB Is sensor connected to PCB correctly Yes Is sensor value correct Note1 Yes Replace corresponding outdoor unit PCB E Error diagnosis and countermeasure flow chart Connect sensor to PCB correctly Note1 If value is 100kQ T open or 100 QL short error occurs NB Resistance value of temperature sensor change according to temperature It is normal if value shown as below 5 error Sensor of air temperature 10 C 20 7kQ Sensor of piping temperature 10 C 10kQ 1257C 10kQ 50 C 3 4kQ 25 C 5kQ 50 C 1 8kQ Error No Error type Error point Main reasons 47 Discharge piping Master 471 temperature sen Abnormal value of Refer to CH41 Slave1 472 sor error of con sensor Open Short Slave2 473 stant compressor p Piping temperature 48 sensor error of heat wal i Master 481 Exchanger in master Abnormal value of Refer to CH45 Slave1 482 g slave outdoor unit S NSOr Open Short Slave2 483 heat exchanger B Copyright 2008 LG Electronics Inc All right reserved 128 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide a Error type Error point Main reasons 50 Maner 1 Input voltage abnormal R S T N 501 Outdoor unit3phase power Omitting one or more of 2 a k g Li fi A diti Slave
71. ergizing the crankcase heater for more than 6 hours will cause the refrigerant to evaporate increasing the insulation resistance 3 Check if high low pressure common pipe liquid pipe and gas pipe valves are fully opened NOTE Be sure to tighten caps 4 Check if there are any problems in automatic addressing or not Check and confirm that there are no error messages in the display of indoor units or remote controls and LED in outdoor units Ay caution When cutting main power of the Multi V e Always apply main power of the outdoor unit during use of product cooling season heating season e Always apply power before 6 hours to heat the crank case heater where performing test run after installation of product It may result in burning out of the compressor if not preheating the crank case with the electrical heater for more than 6 hours In case of the outdoor temperature below 10 C e When operating t he unit after powering off automatically run into in the preheat mode for 3 hours and PH is indicated on the outdoor unit 7 Segment Ax caution Preheat of compressor e Start preheat operation for 3 hours after supplying main power e In case that the outdoor temperature is low be sure to supply power 6 hours before operation so that the heater is heated insufficient heating may cause damage of the compressor Copyright 2008 LG Electronics Inc All right reserved 69 Only for training and s
72. ervice purposes LGE Internal Use Only Test Run The phenomena from main component failure Component Phenomenon Cause Check method and trouble shooting Not operating Motor insulation broken Check resistance between terminals and chassis Strainer clogged Change strainer Compressor Oil leakage Check oil amount after opening oil port Stop during running Motor insulation failure Check resistance between terminals and chassis Abnormal noise R S T misconnection Check compressor R S T connection during running High pressure error Motor failure Check the outdoor fan operation after being Outdoor Na naka f f at cooling bad ventilation around turned the outdoor units off for some time an R outdoor heat exchanger Remove obstacles around the outdoor units Heating failure fre Bad connector contact Check connector quent defrosting No operating sound Coil failure Check resistance between terminals at applying power t r 5 7 Qutdop Heating failure EEV clogged Service necessary EEV frozen outdoor heat exchanger part Low pressure error EEV clogged Service necessary or discharge temper ature error When system fault occurs the error code is displayed at indoor unit display or remote control display the trou ble shooting guide is in the service manual e When CH05 53 11 ERROR occurs check if auto addressing has done and communication wiring is ok Copyright 2008 LG Electronics
73. f outdoor PCB when outdoor temperature is below 15 C e Turn on the No 5 dip switch of outdoor PCB when outdoor temperature is over 15 C e Reset the power of outdoor unit e Wait 3 minuts e Press SWO1V of the outdoor unit main PCB for 5 seconds e The number of connected HR unit is displayed Ex In case of installing four HR units 04 e Operated after 88 is displayed on 7 SEG of the outdoor unit main PCB e Pipe detection proceed e 5 30 minutes are required depending on the number of the indoor units and outdoor temperature e The number of the indoor units installed is displayed on 7 SEG of the outdoor unit main PCB for about 1 minute For a HR unit the number of the indoor units connected to each HR unit is displayed e 200 is displayed in case of auto pipe detection error and auto detection is completed after 88 is disap peared 3x Auto pipe detection function the function that sets connection relationship automatically between the indoor unit and HR unit Copyright 2008 LG Electronics Inc All right reserved 62 Only for training and service purposes LGE Intemal Use Only HR Unit PCB Ah WARNING 1 Execute auto addressing and auto pipe detection again whenever the indoor PCB and HR unit PCB is replaced e Operation error occurs unless power is applied to the indoor and HR units 2 Error No 200 occurs if the number of connected indoor units and that of scanned indoor units are dif ferent 3 When a
74. ght reserved 134 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide a Error type Error point Main reasons Slave outdoor unit mixed installing old Sub outdoor 59 unit and new slave outdoor installation l orod unit together Installing LGDC slave unit and super sub unit together E Error diagnosis and countermeasure flow chart Installed 3 unit or more Recheck power and installation condition Is LGDC slave unit installed Recheck power and installation condition Recheck power and installation condition Is super sub unit installed Yes Slave Sub unit mixed installation x Slave unit dip switch setting Slave 1 Slave 2 Copyright 2008 LG Electronics Inc All right reserved 135 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 60 Master 1 EEPROM contact defect wrong insertion 601 Inverter PCB EEPROM EEPROM Access error and 2 Different EEPROM Version Slave1 error check sum error 3 Outdoor unit inverter PCB assembly dam 602 age Slave2 603 B Error diagnosis and countermeasure flow chart 1 Check EEPROM insert direction connection condition 2 Check EEPROM check sum Replace if abnormality found Is EEPROM insertion normal Is inverter PCB assembly normal Replace inverter PCB assembly Rech
75. h discharge temperature temperature c E Slave3 outdoor unit constant System is turned off by slave3 outdoor unit constant 8 4 speed compressor high discharge speed high discharge temperature temperature O 1 High pressure of master outdoor System is turned off by excessive increase of high unit pressure of master outdoor unit 2 High pressure of slave1 outdoor System is turned off by excessive increase of high ala unit pressure of slave1 outdoor unit 3 High pressure of slave2 outdoor System is turned off by excessive increase of high unit pressure of slave2 outdoor unit 4 High pressure of slave3 outdoor System is turned off by excessive increase of high unit pressure of slave3 outdoor unit 1 Low pressure of master outdoor System is turned off by excessive decrease of low unit pressure of master outdoor unit 2 Low pressure of slave1 outdoor System is turned off by excessive decrease of low F unit pressure of slave1 outdoor unit 3 Low pressure of slave2 outdoor System is turned off by excessive decrease of low unit pressure of slave2 outdoor unit 4 Low pressure of slave3 outdoor System is turned off by excessive decrease of low unit pressure of slave3 outdoor unit Copyright 2008 LG Electronics Inc All right reserved 93 Only for training and service purposes LGE Internal Use Only Self diagnosis function Display Title Cause of error 4 Master out
76. he black button Refrigerant auto 578 charging process Indoor unit and outdoor unit are turned off EEE when auto charging is completed Close the valve Note 2 Press the black button EEE Press the black button for 2 sec after turning off all of dip switch gog Main PCB SWO1V Completed Copyright 2008 LG Electronics Inc All right reserved 34 Only for training and service purposes LGE Internal Use Only Functions rat manifold Capillary Assembly Gas Pipe Sst Liquid Pipe Procedure 1 Arrange manifold capillary assembly refrigerant vessel and scale 2 Connect manifold to the gas pipe service valve of outdoor uint as shown in the figure 3 Connect manifold and Capillary tube Use designated capillary assembly only If designated capillary assembly isn t used the system may get damaged 4 Connect capillary and refrigerant vessel 5 Purge hose and manifold 6 After EEE Is displayed open the valve and charge the refrigerant B Error contents about auto refrigerant charging function Al EEE Temperature
77. heck fan PCB assembly IPM normal Replace fan PCB assembly Is fan PCB assembly normal Recheck power and installation condition Measuring fan motor phase Measuring insulation resistance resistance between fan terminal amp chassis Hg Fan motor wire connection Check the connection condition Copyright 2008 LG Electronics Inc All right reserved 146 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 86 Master 861 Main PCB EEPROM Slave1 862 error Slave2 863 EEPROM access error 1 No EEPROM 2 EEPROM wrong insertion E Error diagnosis and countermeasure flow chart Is EEPROM assemble condition normal Is EEPROM 24016 Yes Recheck power and installation condition Reset after checking EEPROM assemble condition Replace EEPROM with 24C16 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 147 LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 87 Error occurs when checking the 1 EEPROM bad contact wrong insertion san paka oe CN EEPROM checksum as initializing 2 EEPROM Version is different Slave 873 after power is supplied 3 Outdoor unitfan PCB assembly damage E Error diagnosis and countermeasure flow chart 1 Check EEPROM insert
78. http biz Igservice com MULTI V syncm System Heat Recovery Outdoor Unit MODEL ARUB Series CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel MULTI V syncm Air Conditioner Service Manual TABLE OF CONTENTS Safety PrecautlOns at ser etterende Nana 3 Part 1 General Information cccccceesececcecceessseeececeneeseceeceeceuseeeeceeseaseneceeeseaeeeeseeseteaaeess 11 dt MOTEL Name Saan AA BANAT GG 12 2 External Appear ane rintintin APANG 13 3 Combination of Outdoor Units aaa 14 4 Nomenclature aba ana Satin BAN Baba a 15 Part 2 Outdoor AA 17 Part 3 AR UN nn nanan Ara Pac a cab rap nig PR Ta hi nG bA kao GAB GA PA 47 Part 4 PCB Setling 8 TESERUN Haman Gaan NAA ANA AA 56 Part 5 Trouble Shooting Guide nennen eeneeneneneeneneneenenenenneneneneen 79 Copyright 2008 LG Electronics Inc All right reserved 2 Only for training and service purposes LGE Internal Use Only Safety Precautions E 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 instruction will cause harm or damage The seriousness is classified by the following indications a gt A WARNING This symbol indicates the possibility of death or serious injury _ ACAUTION This symbol
79. ics Inc All right reserved Only for training and service purposes LGE Internal Use Only External Appearance A 2 External Appearance 2 1 Outdoor Units ARUB180LT2 prone ew aan ARUB220LT2 BEENIE ONNA ARUB120LT2 ARUB240LT2 as a ARUB140LT2 ARUB260LT2 Bet ARUB160LT2 ARUB280LT2 ARUB300LT2 al oi ee 7 ARUB320LT2 pr LO ee n EK 4 8 10 12 14 16HP 18 20 22 24 26 28 30 32HP ARUB340LT2 l ARUB360LT2 EN ONSEN Ann ie we Ste GG ARUB400LT2 Ke ARUB420LT2 THEE GRE ARUB440LT2 ARUB460LT2 a eci ARUB480LT2 ema earth ge mma io ee 4 34 36 38 40 42 44 46 48HP 2 2 HR Unit i PRHR020 PRHR030 PRHR040 For 2 rooms For 3 rooms For 4 rooms Copyright 2008 LG Electronics Inc All right reserved 13 Only for training and service purposes LGE Internal Use Only Combination of Outdoor Units E 3 Combination of Outdoor Units System Capacity Number of Units 50Hz 60Hz Module 12 14 16 8HP 1 10HP 1 12HP 1 14HP 16HP 18HP 20HP 22HP 24HP 26HP 28HP 30HP 32HP 34HP 36HP 38HP i 40HP 42HP N N 44HP z 46HP 48HP WW Wl wl WW ODIN NN N N N N N N B A maximum of 48HP can be obtained by combining 8 10 12 14 and 16HP Copyright 200
80. ion clog level because of drain ging of drain pipe pump failure or drain pipe 3 Indoor unit PCB failure clogging E Error diagnosis and countermeasure flow chart Is the drain pan filled half with condensate water half level of float switch Note1 No Yes Is drain pump working Sound drain noise contact etc No Yes N Drain pump blocked by foreign particles Yes Remove it amp clean the pump Note1 If the float goes up higher than a half of float switch then the circuit is open amp the unit is stopped automatically Condensate water Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes Is float switch short On measuring its resistance Yes Replace indoor PCB or reconnect the connector In indoor unit PCB Does the terminal voltage for drain pump has 220V output Note2 No Replace indoor unit PCB No Replace float switch Yes Replace drain pump Check the drain head height and slope Note3 Checking float Low position mp short 0 ohm 104 LGE Internal Use Only Troubleshooting Guide A Point to check rotating Note 2 Indoor PCB drain pump connector Check input of 220V Marked as CN DPUMP Float switch connector Float switch housing CN FLOAT Ff 1 50 1 100 MAX 700mm Copyright 2008 LG Electronics Inc All right reserved 105 Only for training and
81. ion direction connection condition Is EEPROM insertion normal 2 Check EEPROM checksum Replace EEPROM if abnormality found Replace fan PCB assembly Is fan PCB assembly normal Yes Recheck power and installation condition Fan EEPROM insertion Inverter EEPROM insertion direction Same direction both socket hole and EEPROM hole 3x Note Replace after power off 148 Copyright 2008 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error No Error type Error point Main reasons 104 Master 11 gt 041 T on Master displays outdoor unit num 1 Loose connection of power cable transmis Slave KANG ber which is not communicated sion cable Open Short 12 gt 042 Slave displays own error number 2 Defect of each outdoor unit PCB Slave2 13 gt 043 E Error diagnosis and countermeasure flow chart Is transmission cable installed normally No Connect transmission cable Is slave unit dip switch tting done Dip switch setting setting done Is main PCB power supplied Replace main PCB Slave unit dip switch Connect power cable 1 2 3 4 5 6 5 6 7 8 9 10 11 12 13 14 f 1 ON ON sewez 12 3 4 6 7 1 2 8 424 7 5 6 7 3 5 1 4 5 6 7 8 9 10 11 12 13 14 ON ON Slave3 la Sd 4 5 G w Ja 8 4 B 8 7 1 2 3 4 5 6 7 8 9 1011 12 13 14 Copyright 2
82. ity 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 1 Check heat sink cooling fan connector connection condition 2 Check heat sink cooling fan wire disconnection and wiring gt Reassemble and change wire if abnormality found 3 Check heat sink cooling fan output voltage during compressor operation Check main PCB assembly CN15 fan connector output voltage AC 220V Replace main PCB if output voltage isn t AC 220V 4 Check heat sink cooling fan motor wire disconnection measure resistance between each ends of motor connector measured value should be within 1 7kQ 10 gt Replace fan motor if motor wire is disconnected Copyright 2008 LG Electronics Inc All right reserved 110 Only for training and service purposes Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly if abnormality found LGE Internal Use Only Troubleshooting Guide Measuring resistance between Heat sink cooling fan connector Compressor wire connector connection each terminal of compressor point Measuring insulation resistance between compressor output terminal and chassis a o a a D zn I MMP zu I 796 19 Een 3 2 i et erie Check joining conditon Copyright 2008 LG Electronics Inc All
83. kPa Frequency holding Normal control Pa lt 3284 kPa B Low pressure control Pressure range Normal control Compressor Fan Ps lt 229 kPa after 1min Stop Stop Ps s 229 kPa before 1min 5Hz 4sec 100RPM 4sec Ps lt 242 kPa Normal control Normal control Ps gt 399 kPa M sa 3 1 2 Pressure control on heating mode B High pressure control Pressure range Normal control Compressor Fan 34 Frequency holding frequency or RPM is not increasing can decrease Pa 4003kPa Stop Stop Pa 5 3676kPa 5Hz 4sec 50RPM 4sec Pa lt 3448kPa Normal control Normal control Pa lt Target press B Low pressure control Normal control Pressure range Compressor Fan Hot gas Ps lt 229 kP a i Stop Stop after 1min Pas 229 kPa DRO 5H2 4sec 100RPM 4sec ON 1min Ps lt 242 kPa Frequency holding Normal control Ps lt 268kPa Ps gt 307kPa M sa Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes Normal control 26 34 Frequency holding frequency or RPM is not increasing can decrease LGE Internal Use Only Functions 3 2 Discharge Temperature Control B Outdoor unit control Temperature range Compressor Liquid injection Subcooling EEV Tdis gt 115
84. leakage indoor unit with cooling mode leakage is much unit 2 Check indoor unit Fan mode liquid pipe temperature Replace EEV from operation monitor of outdoor unit control board 3 When fan rotate and EEV is fully closed if there is any leakage then the temperature is down If estimated temperature is very low in comparison with suction temperature which is displayed at remote controller then the valve is not fully closed Copyright 2008 LG Electronics Inc All right reserved 86 Only for training and service purposes LGE Intemal Use Only Internal circuit diagram 1 Wait until inverter PCB DC voltage gets discharged after the main power switch off 2 Pull out all the connectors connected with 3 phase bridge diode 3 Set multi tester in diode mode 4 Measured value should be 0 4 0 7V measuring as below table Appearance Checking Method for Key Components 5 In case the measured value is different from the table set multi tester to resistance mode and measure If the value is small 0 Q or high hundreds M Q PCB needs to be replaced 6 In case that bridge diode is damaged check if inverter PCB assembly IPM is needed to be replaced Poum tamminal terminal black terminal red Tester terminal R red 0 4 V 0 7 V S red 0 4 V 0 7 V T red 0 4 V 0 7 V R black 0 4V 0 7V S black 0 4V 0 7V T
85. ll model code is displayed in 7 segment including all slave unit communication between outdoor units is normal If 104 is displayed in 7 segment check communication wires between outdoor units and dip switch setting 3 Step 3 PCB error check After 40 sec error check begins B Master slave unit All errors of units including slave units are displayed in 7 segment If communication between main PCB and inverter PCB isn t normal 52 is displayed in 7 segment If communication between main PCB and fan PCB isn t normal 105 is displayed in 7 segment If error is displayed check corresponding wires 4 Step 4 Auto addressing of indoor units and HR units Auto addressing begins when addressing button Red in Main PCB in pressed for 6 sec During Auto addressing 7 segment on Main PCB displays 88 After Auto addressing the number of indoor units and HR units are displayed in 7 segments for 30 sec The address of each indoor units are displayed on each wired remote controller ON ON Push addressing button Red for 6 sec UOTE U UL OUTIL UL 12 3 4 5 6 7 12 3 4 5 6 7 12 3 4 5 6 T 8 9 1011 12 13 14 35 indoor units found 4 HR units found Auto address process is finished Every indoor units display its address on the wired Remote controller and the 7 segment of main PCB is off Copyright 2008 LG Electronics Inc All right reserved 30 Only for training and service purposes LGE Intemal Use Only Fu
86. looded or domly operate the wire remote control for submerged contact an Authorized Service play Center e Frequent conversion to cold or heat mode may e There is risk of fire or electric shock cause failure of the unit Be cautious not to touch the sharp edges Take care to ensure that nobody could step when installing on or fall onto the outdoor unit e It may cause injury e This could result in personal injury and product damage Copyright 2008 LG Electronics Inc All right reserved 6 Only for training and service purposes LGE Internal Use Only Safety Precautions Do not open the inlet grill of the product during operation Do not touch the electrostatic filter if the unit is so equipped e There is risk of physical injury electric shock or product failure ACAUTION E Installation Always check for gas refrigerant leakage Do not install the product where the noise or after installation or repair of product hot air from the outdoor unit could damage the neighborhoods e Low refrigerant levels may cause failure of e t may cause a problem for your neighbors product Keep level even when installing the product Do not install the unit where combustible gas may leak e To avoid vibration or water leakage e If the gas leaks and accumulates around the unit an explosion may result Use power cables of sufficient current Do not use the product for special purposes carrying c
87. ltage is 220V 10 Check connection condition and wiring if power is abnorma Check inverter PCB assembly IPM normality Replace inverter PCB assembly Is inverter PCB assembly normal Recheck power and installation condition Copyright 2008 LG Electronics Inc All right reserved 120 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide Measuring resistance between each Compressor wire connection terminal of compressor Bo Bo ze mes nota neie EB2e22033 PO a O Copyright 2008 LG Electronics Inc All right reserved 121 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide ra Error type Error point Main reasons pi a 1 Temperature sensor defect of inverter com 32 ki ia ompressor is o pressor discharge pipe Master 321 OMERTA ordis because of over increase 5 Refrigerant shortage leak charge temperature of g g Slavet 322 discharge temperature of inverter compressor f 3 EEV defect Slave2 323 inverter compressor ARE 4 Liquid injection valve defect 33 Compressor is off 1 Temperature sensor defect of constant Master 331 Over increase of discharge because of over increase compressor discharge pipe Slavet 332 temperature of constant discharge temperature of 2 Refrigerant shortage leak a 333 speed compressor constant compressor at 3 EEV defect ave i i a cereal main and sub outdoor unit 4 Liquid
88. lve Large capacity indoor unit Large capacity indoor unit No 3 4 valve control Note If the large capacity indoor units are installed below Y branch pipe should be used x Y branch pipe Unit mm Models Gas pipe Liquid pipe LD 19 05 D 22 2 lD 19 05 iD a 15 88 1 D 15 88 LD 12 7 LD 28 58 OD 22 2 LD 25 4 ARBLB03320 Copyright 2008 LG Electronics Inc All right reserved 60 Only for training and service purposes LGE Intemal Use Only HR Unit PCB 2 SW05M Rotary switch for addressing HR unit Must be set to O when installing only one HR unit When installing multiple HR units address the HR units with sequentially increasing numbers starting from O Ex Installation of 3 HR units 3 SW01M SW03M SWO04M Dip switch and tact switch for manual valve addressing Used in manual addressing of the valve in the HR unit Set the address of the valve of the HR unit to the central control address of the connected indoor unit SWO1M selection of the valve to address SW03M increase in the digit of 10 of valve address SWO4M increase in the last digit of valve address Prerequisite for manual valve addressing central control address of each indoor unit must be preset differ ently at its wired remote control Switch No Setup No 1 Manual addressing of valve 1 No 2 Manual addressing of valve 2 No 3
89. mple of Checkin In case that an indoor unit of central control address 11 is connected to a valve 1 of an HR unit No Display and setup Setup and contents 1 if AWW eee Tum dip Sieh No 1 on SWOIM e Display 11 is displayed in 7 SEG Ka ajajaja e Operation Turn dip switch No 1 on 2 e 7 SEG disappeared SW01M 6 Identification of Mant No Display and setup Setup and contents gi e Operation more than 2 dip switches turned on 1 Ea Atv SWOIM e Display Er is displayed in 7 SEG Copyright 2008 LG Electronics Inc All right reserved 68 Only for training and service purposes LGE Intemal Use Only Test Run E Test Run 1 Check to see whether there is any refrigerant leakage and slack of power or transmission cable 2 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 megaohm check over terminal control board Otherwise the control board would be broken 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 may decrease to approx 2 MQ as a result of refrigerant accumulating in the internal compressor If the insulation resistance is less than 2 MQ turning on the main power supply and en
90. mpressor discharge pipe tem Vi Slave2 413 cae pipe tem Sensor measurement 2 ae paa je perce sense valve is abnormal Defective discharge pipe com Constant et Open Short pressor sensor of the compres Master 471 sor open short Slave 472 3 Defective outdoor PCB Slave2 473 E Error diagnosis and countermeasure flow chart Sensor connection to PCB is normal Yes Is the resistance of sensor normal Note1 Yes Insert sensor connector to PCB properly Replace sensor Is sensor resistance value same as temperature value of LGMV Replace corresponding outdoor PCB Yes Replace corresponding sensor Note1 Error is generated if the resistance is more than 5MQ open and less than 2kQ short Note Standard values of resistance of sensors at different temperatures 5 variation 10 C 362kQ 25 C 200kQ 50 C 82kQ 100 C 18 5kQ Check the resistance Check the resistance inverter compressor of constant compressor discharge temperature discharge temperature sensor sensor Copyright 2008 LG Electronics Inc All right reserved 126 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide i Error type Error point Main reasons 42 i a Abnormal value of 1 Bad connection of low pressure connector aen Sensor error of low sensor 2 Defect of low pressure connector Open Short ave pressure 3 Defect of outdoor PCB eb Open
91. n PCB When the addressing signal doesn t respond for 3mins suddenly of outdoor while the indoor unit gets the calling signal from the outdoor unit 1 Master outdoor unit inverter compressor IPM Master outdoor unit inverter compressor drive IPM fault Fault 2 Slave1 outdoor unit inverter compressor IPM Slave1 outdoor unit inverter compressor drive IPM fault ae fault g 3 Slave2 outdoor unit inverter compressor IPM Slave2 outdoor unit inverter compressor drive IPM fault fault EE 4 Slave3 outdoor unit inverter compressor IPM Slave3 outdoor unit inverter compressor drive IPM fault o fault 4 Inverter board input over current RMS of Master outdoor unit inverter board input current excess RMS 5 master outdoor unit 5 2 Inverter board input over current RMS of Slave1 outdoor unit inverter board input current excess RMS 6 ae slave1 outdoor unit 3 Inverter board input over current RMS of Slave2 outdoor unit inverter board input current excess RMS slave2 outdoor unit 4 Inverter board input over current RMS of Slave3 outdoor unit inverter board input current excess RMS slave3 outdoor unit Copyright 2008 LG Electronics Inc All right reserved 91 Only for training and service purposes LGE Internal Use Only Self diagnosis function Display Title Cause of error 1 Master outdoor unit inverter com DC charging is not performed at mast
92. nctions 4 2 Emergency Operation If a compressor is out of order the system can be run except the defective compressor by backup function B Automatic emergency operation automatic back up function If outdoor unit detect comp defect during operation automatic back up mode is set 1 Inverter compressor automatic emergency operation 2 Constant compressor automatic emergency operation B Manual emergency operation Manual back up function 1 Check which compressor is broken 2 Turn off the power 3 Set the dip switch of defective outdoor unit Inverter compressor defect Dip switch No 3 Unit defect Dip switch No 4 4 Turn on the power MASTER SLAVE1 SLAVE2 INV C INV C INV C MASTER SLAVE1 SLAVE2 DIP switch of Slavet ON ON Fail of Slave1 12a 4e e7 Sew 12 1s 1a MASTER SLAVE1 SLAV E2 DIP switch of Slave2 save wl fo l fo onan Slave2 i B fesse sow ets Ah caution Emergency operation with inverter compressor failure should not last 48 hours gt It causes other compressor failure During the emergency operation cooling heating capacity may be lower Copyright 2008 LG Electronics Inc All right reserved 31 Only for training and service purposes LGE Internal Use Only Functions Note 1 4 3 Sensor Checking Function Sensor checking function judges whether the current temperature of indoor and outdoor unit sensors is right or not It checks 3 indoor temperature sensors 9 out
93. nection between inverter PCB assembly and bridge diode misconnection disconnection gt wiring again if abnormality found Is inverter PCB assembly power connection normal Check Is input voltage normal R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 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 Yes Recheck power and installation condition Copyright 2008 LG Electronics Inc All right reserved 112 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide Measuring resistance between Inverter PCB amp bridge diode wiring each terminal of compressor Compressor wire connector connection Measuring input voltage Copyright 2008 LG Electronics Inc All right reserved 113 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide ig Error type Error point Main reasons 23 1 DC link terminal misconnection terminal en contact failure 231 Inverter compressor DC link DC voltage isn t charged AA Ala atin Slave1 low voltage after starting relay on i g 4 Inverter PCB assembly damage 232 DC link voltage sensing part Slave2 5 Input voltage low 233 E Error diagnosis and countermeasure flow chart Is input voltage normal Is inve
94. nit rotary and outdoor unit e NA unit and outdoor unit switch and dip switch 3 Defective HR unit PCB E Error diagnosis and countermeasure flow chart 1 Check connection between power cables and transmission cables check transmission green LED blink of HR unit PCB 2 If transmission green LED blink of HR unit PCB is normal check setting of rotary switch of HR unit and dip switch Refer to CH200 Reset power of outdoor and HR unit If transmission error of HR unit occurs it can t be released until reset of outdoor power 3 If transmission green LED blink of HR unit PCB is abnormal not blinking just on check transmission condition of total indoor units Refer to CHO5 If transmission green LED blink of HR unit PCB is abnormal not blinking just on even if transmission condition is normal replace HR unit PCB NB If Indoor units transmission cables of HR unit and cables of power 220V has been changed each other trans mission parts and indoor will be burnt HR Unit PCB 4 valve housing 1 cooling valve LED green wy 1 heating valve LED red A ie SWOSM Switch for Green LED blinking een transmission is normal KS SWO1M Dip switch for ee a the function of HR unit SWO3M __SWO4M addressing Copyright 2008 LG Electronics Inc All right reserved 160 LGE Internal Use Only Only for training and service purposes P NO MFL42767902 Jan 2008
95. nnection proper onnect Properly Yes Is fan motor normal Note1 Replace indoor unit fan motor Replace indoor unit PCB Note2 Note1 It is normal when check hall sensor of indoor fan motor as shown below Each termainl with the tester San Tester Normal resistance 10 TH chassis TD chassis co co essoda 8 8 n hundreds KQ hundreds KO 1 i ea ca D DOOD D hundreds kQ hundreds kQ lt Checking connection state of fan motor connector gt Note2 Replace the indoor unit PCB and then make sure to do Auto addressing and input the address of central control Notice The connection of motor connector to PCB should be done under no power supplying to PCB Copyright 2008 LG Electronics Inc All right reserved 108 Only for training and service purposes si Error type Error point Main reasons Indoor unit BLDC fan motor Indoor BLDC fan motor 1 Motor connector connection failure 10 failure feedback signal is absent 2 Indoor PCB failure for 50 sec 3 Motor failure LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons Indoor unit transmission error Indoor unit doesn t get sig 11 nal from outdoor unit for 3 minutes continuously 1 Indoor 485 transmission PCB failure 2 After PCB replacing auto addressing was not done E Error diagnosis and countermeasure flo
96. nnnen 36 46 PUMP DOWN ordenende AG a 38 4 7 Pump OUt samaan NAA dens eenennnken des dead teai veen vans eansnnnauwelnd 39 4 8 Auto Back Up Function_Inverter CompressOr nnee nnnnennnenenenn 41 4 9 Auto Back Up Function Constant Speed Compressor cccccceeeeeeseeeeeeeeeeeeees 42 4 10 Night Silent Operation Function nanne ennnnnnneeeeeenennnnnneenenennnnnnenneeneennnnnnenen 43 4 11 Vacuum Mode GANANG RANGE 45 4 12 Black Box Function NIGERIA 46 Copyright 02008 LG Electronics Inc All right reserved 19 Only for training and service purposes LGE Internal Use Only Functions 1 1 Normal Operation Actuator Cooling operation Heating operation Stop state Compressor Fuzzy control Fuzzy control Stop Fan Fuzzy control Fuzzy control Stop Before 15 min Max pulse Main EEV Full open Fuzzy control After 15 min Min pulse 4way valve Off On After 60 min Off e Normal minimum pulse na Subcooling Egay conte Avoiding control of high Before 15 mn Max pulse EEV discharge temperature After 15 min Min pulse Indoor unit Superheat fuzzy Subcooling f Before 10 min Min pulse trol EEV control PRESNI Nia AU After 10 min Max pulse Note Heating operation is not functional at an outdoor air temperature of 27 C or more Cooling operation is not functional at an outdoor air temperature of 2 C or less with indoor unit combina tion of 1096 or less 1 2 Compressor Control Fuzzy cont
97. nt port after opening the high pressure pipe of corresponding outdoor unit Replace compressor and perform vacuum 6 Add the refrigerant with auto charging function Copyright 2008 LG Electronics Inc All right reserved 40 Only for training and service purposes LGE Intemal Use Only Functions 4 8 Auto Back Up Function_Inverter Compressor This function allows the system to operate in case of inverter compressor failure by backing up compressor automatically SVC can be asked by displaying error to the customer every 6 hours l CH 21 22 26 27 error occur Indoor unit remote controller error clear Indoor unit operation possible Example Slave1 unit inverter compressor start failure error occur Outdoor unit Error number A Caution 1 Request SVC immediately if error occurs 2 Auto back up is set up to 1 inverter compressor 3 If inverter compressor auto back up starts error displays for 10 min every 6 hours 4 Error displays continuously at the corresponding Outdoor unit Copyright 2008 LG Electronics Inc All right reserved 41 Only for training and service purposes LGE Internal Use Only Functions 4 9 Auto Back Up Function_Constant Speed Compressor This function allows the system to operate in case of constant speed compressor failure by backing up compressor automatically Constant speed compressor operation Constant speed compressor failure Constant speed compressor Aut
98. o back up Yes Count back Up over 5 Constant speed compressor No Auto back up Yes Error clear Indoor unit outdoor unit display error for 10 min Example Slave1 unit constant speed compressor failure CH 173 rita IIC Outdoor unit Error number A Caution 1 Request SVC immediately if error occurs Copyright 2008 LG Electronics Inc All right reserved 42 Only for training and service purposes LGE Internal Use Only Functions 4 10 Night Silent Operation Function In cooling mode this function makes the outdoor unit fan operates at low RPM to reduce the fan noise of out door unit at night which has low cooling load Max RPM Setting method Master ODU Dip switch No 12 14 ON SW01B Master ODU Main PCB Power reset SW018 Note 1 SWO1V Setting the Fan max RPM SWo2V Example of Max RPM Setting Fan Max RPM Step 1 Night silent operation start 8 hours after max Outdoor unit temp sensing the fan max RPM is operated setting RPM Night silent operation end gt 9 hours after night silent operation is started the function should be stopped automatically CAUTION 1 Request installer to set the function during installation 2 In case the function is not used set the dip switch OFF and reset the power 3 If ODU RPM changes cooling capacity may go down Note 1 Method for setting the fan max RPM and operating time Setting Fan Max
99. on 3 Check compressor terminal connection condition condition normal bad contact gt Reassemble if abnormality found Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly Is inverter PCB assembly normal Yes Recheck power and installation condition Copyright 2008 LG Electronics Inc All right reserved 117 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Measuring resistance between each terminal of compressor Copyright 2008 LG Electronics Inc All right reserved 118 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide rik Error type Error point Main reasons 28 Master 281 Inverter DC link high Inverter PCB DC link volt Slave1 voltage error age supplied over 780V 282 Slave2 283 1 Input voltage abnormal R S T N 2 Outdoor unitinverter PCB damage DC link voltage sensing part E Error diagnosis and countermeasure flow chart Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Is put votaga normali Check connection condition and wiring if power is abnormal Replace inverter PCB assembly Recheck power and installation condition Measuring input voltage Noise filter wiring pasa 3 Noise filter output lower part Noise filter input upper part Copyright 2008 LG Electronics Inc All right
100. oor unit PCB auto addressing should be done if central controller is installed then the central control address also should be input In case that only transmission PCB is replaced above process is not needed Copyright 2008 LG Electronics Inc All right reserved 133 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide E Error diagnosis and countermeasure flow chart Connect correctly Is connection and phase order of power cables to main slave outdoor unit correct Note1 Is connection and phase order of power distribution panel correct Note2 Connect power cables in distribution panel correctly Is CH 54 occurred again after reset MAIN circuit breaker Yes Is main PCB fuse normal Yes Replace main PCB Replace Fuse ated Error type Error point Main reasons 54 Wrong connection of3Q Wrong connection of 3Q 1 Main PCB defect Master 541 power supply cable power supply cable 2 No power of R S T supplied Slave1 542 Reverse direction missing Reverse direction miss 3 Wring connection of R S T cables Slave2 543 a phase ing a phase 4 main PCB Fuse failure Note1 Check power cable connection state Note2 Check power cable connection state phase R S T order power supply state phase order power supply state in distribution panel in control box of product Copyright 2008 LG Electronics Inc All ri
101. or unit constant speed compressor dis 4 speed compressor discharge tem charge temperature sensor open or short perature sensor fault Master outdoor unit heat Master outdoor unit heat exchanger temperature sen 1 lexchanger temperature sensor B sor B open or short fault Slave1 outdoor unit heat Slave1 outdoor unit heat exchanger temperature sen 2 exchanger temperature sensor B sor B open or short fault 4 8 f Slave2 outdoor unit heat Slave2 outdoor unit heat exchanger temperature sen 3 exchanger temperature sensor B sor B open or short fault Slave3 outdoor unit heat Slave3 outdoor unit heat exchanger temperature sen 4 exchanger temperature sensor B sor B open or short fault Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 95 LGE Internal Use Only Self diagnosis function Display Title Cause of error 4 Omitting connection of R Omitting connection of master outdoor unit power of outdoor unit 50 error 2 Note Omitting connection of slave1 outdoor unit 510 Omitting connection of S 3 power of outdoor unit 23 error Omitting connection of slave2 outdoor unit lOmitting connection of T 4 power of outdoor unt Omitting connection of slave3 outdoor unit Main PCB power off 5 114 Excessive capacity of indoor units Excessive connection of indoor units compared to capacity of outdoor
102. or unit heat exchanger temperature sen 2 exchanger temperature sensor A sor A open or short fault Al Slave2 outdoor unit heat Slave2 outdoor unit heat exchanger temperature sen 3 exchanger temperature sensor A sor A open or short fault Slave3 outdoor unit heat Slave3 outdoor unit heat exchanger temperature sen 4 exchanger temperature sensor A sor A open or short fault 1 Master outdoor unit suction tem Master outdoor unit suction temperature sensor open perature sensor fault or short 2 Slave1 outdoor unit suction tem Slave1 outdoor unit suction temperature sensor open rae perature sensor fault or short 3 Slave2 outdoor unit suction tem Slave2 outdoor unit suction temperature sensor open perature sensor fault or short 4 Slave3 outdoor unit suction tem Slave3 outdoor unit suction temperature sensor open perature sensor fault or short T Master outdoor unit constant Master outdoor unit constant speed compressor dis 1 speed compressor discharge tem charge temperature sensor open or short perature sensor fault S Slave1 outdoor unit constant Slave1 outdoor unit constant speed compressor dis o 2 speed compressor discharge tem charge temperature sensor open or short 6 Pak perature sensor fault Slave2 outdoor unit constant Slave2 outdoor unit constant speed compressor dis 3 speed compressor discharge tem charge temperature sensor open or short perature sensor fault Slave3 outdoor unit constant Slave3 outdo
103. ound Check R S S T T R phase voltage is 380V R N S N T N phase voltage is 220V 10 10 Check connection condition and wiring if power is abnormal 1 Check R S T N connection condition 2 Check wire disconnection and wiring 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 Reassemble if abnormality found Check inverter PCB assembly IPM normality Replace inverter PCB assembly 140 LGE Internal Use Only Troubleshooting Guide Inverter PCB assembly power Noise filter power connection connection Copyright 2008 LG Electronics Inc All right reserved 141 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 74 During operation compre fre 1 CT sensor defect uring operation compressor fre i Master 741 3 Phase power unbalance Wency is over 50Hz difference A strane a ae ich Slave1 742 p between R amp T phase is 5A for 10 nege NN or S N or TN phase Slave2 743 seconds voltage unequally at indoor unit etc E Error diagnosis and countermeasure flow chart Check abnormal wiring between Inverter PCB assembly amp bridge diode misconnection disconnection gt Rewiring if abnormal wiring found Is inverter PCB assembly p
104. ower wiring normal Check 3 p R S S T T R phase voltage is 380V 10 leinpurveliage normali R N S N T N phase voltage is 220V 10 gt Check connection condition and wiring if power is abnormal Does indoor unit power i bridge R S T phase equally Bridge R N S N T N voltage equally Is inverter PCB assembly normal Recheck power and installing condition Replace inverter PCB assembly Checking joining condition Copyright 2008 LG Electronics Inc All right reserved 142 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 75 Master 751 HANG adasecanar Offset of micom which senses the _ 1 Input voltage is abnormal not 15V Slave1 752 fan motor phase current is not 2 5V 2 Fan PCB assembly defect Slave2 753 E Error diagnosis and countermeasure flow chart Check 15V wire connection Is input voltage normal A gt Reassemble or manage if abnormality found Is fan PCB assembly normal Recheck power and installation condition Replace fan PCB assembly Copyright 2008 LG Electronics Inc All right reserved 143 Only for training and service purposes Checking 15V LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 76 Master 761 Fan DC link high voltage Fan PCB DC link voltage supplied 1 Input power abnormal
105. parts are firmly secured by tightening screws 4 Check connection of polarity 5 Check short circuit and grounding 3 For failure of motor Measure winding resistance of the motor coils 4 For defective fuse Replace the fuse if there is defect Fuse 800V 5 For failure of circuit board 30A Replace the circuit board in following procedures if problems occur again when powering on and if there are no matters equivalent to items as speci fied in above 1 through 4 Carefully check both connector and grounding wires when replacing the circuit board 1 Replace only fan control boards If starting is done it means that the fan control board has defect 2 Replace both fan control board and the main board If starting is done it means that the main board has defect 3 If problems continue to occur even after counter measure of No 1 and No 2 it means that both boards has defect Copyright 2008 LG Electronics Inc All right reserved 83 Only for training and service purposes LGE Internal Use Only Checking Method for Key Components DC 12V EEV Driving Ka 05 Red e 5 circuit 3 1 04 White A 4 94 oh Z ofl lt 03 Yellow O 3 pg Leas 02 Orange 2 BZ DD ae ari o1 Blue 1 Ki eee e Pulse signal output value and valve operation Output state Output g No 1 2 3 4 5 6 7 8 9 10 11 o1
106. peration In case of outdoor temperature below 10 C e Packing materials such as nails and other metal or Starting operation immediately after turning on wooden parts may cause stabs or other injuries the main power switch can result in severe e Tear apart and throw away plastic packaging bags damage to internal parts Keep the power switch so that children may not play with them If children turned on during the operational season play with a plastic bag which was not torn apart they face the risk of suffoca tion Copyright 2008 LG Electronics Inc All right reserved 9 Only for training and service purposes LGE Internal Use Only Do not touch any of the refrigerant piping Do not operate the air conditioner with the during and after operation panels or guards removed e It can cause a burn or frostbite e Rotating hot or high voltage parts can cause injuries Do not directly turn off the main power Auto addressing should be done in condition of switch after stopping operation connecting the power of all indoor and outdoor units Auto addressing should also be done in case of changing the Indoor unit PCB e Wait at least 5 minutes before turning off the main power switch Otherwise it may result in water leakage or other problems Use a firm stool or ladder when cleaning or Do not insert hands or other objects through maintaining the air conditioner the air inlet or outlet while the air conditioner
107. pplied in order as follow Slave2 gt Slave1 gt Mater Outdoor unit information is displayed one after the other at main PCB 7 segment 1 Model ID gt 8HP 62 10HP 63 12HP 64 14HP 65 2 Total Capacity gt Displayed with HP 3 Outdoor unit Type Heat pump 2 Cooling 0 4 Normal mode 25 5 Refrigerant gt R410a 41 Note5 Checking method for outdoor unit of 3unit system Master Slave1 Slave2 Close all the SVC valves of high low pressure common pipe Operate system Check the difference of high and low pressure with LGMV for each unit Master Slave1 Slave2 If there is a unit in which the difference is not increased then the 4way valve of that unit is defective Copyright 2008 LG Electronics Inc All right reserved 155 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 173 Master Ceiri d Constant compressor damage 11 gt 731 Slave1 Constant compressor aa Na pani 2 Constant compressor input over gn detect in ios current i currant ere ie a 3 Discharge temperature sensor defect Slave2 13 gt 733 E Error diagnosis and countermeasure flow chart Is resistance value insulation amp phase to phase of corresponding constant compressor normal refer electric component part Is cables connection of compressor normal Is discharge temperature sensor of compressor normal
108. pulse Min pulse Oil return signal OFF B Oil return operation time 3 min for running step B Starting condition same as cooling mode B Oil return process ends if compressor protection control starts Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 23 ON OFF LGE Internal Use Only Functions 2 2 Defrost Defrost operation eliminates ice attached on heat exchanger recovering performance of heat exchanger Each cycle component operates as following table during defrost operation Outdoor Unit Component Starting Running Ending Inverter compressor 25Hz Setting Value 25Hz Constant speed compressor OFF ON OFF FAN Stop High pressure control 50Hz Main EEV Normal control Max pulse 200 pulse Subcooling EEV Min pulse Min pulse Min pulse 4way valve On gt OFF OFF ON Hot gas bypass valve Normal control Normal control Normal control Indoor Unit Component Starting Running Ending Fan OFF OFF OFF Thermo on unit EEV Normal control 1200 pulse Normal control Thermo off unit EEV Min pulse 1200 pulse Min pulse E Ending condition 1 All heat exchanger pipe temperature are above 20 C UW1 for 30 sec 2 The running time of defrost operation is over 30 of the total heating time 3 If compressor protection control sta
109. r unit gt main PCB receive signal from indoor 2 Transmission cables are short open unit 3 Defect of outdoor main indoor PCB E Error diagnosis and countermeasure flow chart Are quantity of indoor units installed same as the data of LGMV Is indoor unit quantity correct after auto addressing Is power supplied to indoor units Yes Supply power Replace indoor unit PCB or transmission PCB after check defected indoor In case of CH53 almost happened with CHO5 the indoor units not operated actually are normal so check with same method of CHO5 and additionally check as shown as below and above flow chart e Although the quantity of indoor units installed is same as LGMV data there may be a few indoor units with which the number of transmission is not increased with LGMV e Although the quantity of indoor units installed is not same as LGMV data and if transmission of the indoor unit displayed at LGMV is done well then the indoor unit suspected to have some problem and is not appear at LGMV may have following problems wrong connection of transmission cable or power cable failure of power PCB transmission cable duplication of indoor unit number elf transmission is not doing well wholly then the auto addressing is not done e The case that CH53 appear at indoor unit also auto addressing is not done so indoor unit address may be dupli cated After replacement of ind
110. rainer Compressor Oil leakage Check oil amount after opening oil port Stop during running Motor insulation failure Check resistance between terminals and chassis Abnormal noise R S T misconnection Check compressor R S T connection during running Outdoor High pressure error Motor failure Check the fan operation to confirm proper fan in cooling mode bad ventilation around motor functioning Switch OFF the outdoor operation outdoor heat exchanger unit and remove obstacles if any around the HEX Check connector Heating failure fre Bad connector contact Check resistance between terminals quent defrosting No operation sound Coil failure Service necessary Outdoor after switching ON EEV the power supply Heating failure EEV clogged Service necessary frozen outdoor heat exchanger part Low pressure error 8 EEV clogged or discharge temper ature error When system fault occurs the error code is displayed on the indoor unit display or remote control display The trouble shooting guide is available in the service manual e When CH05 53 11 error occurs check if auto addressing has done and communication wiring is ok Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 81 LGE Internal Use Only B 2 Checking Method for Key Fompornents Check and ensure in following order when error related with the compressor or error related with power occurs during operation
111. reserved 119 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide ig Error type Error point Main reasons 29 1 Overload operation Pipe clogging Covering EEV defect Ref Master overcharge 291 Inverter compressor over Inverter compressor input 2 Compressor damage Insulation Slave1 Current current is over 30A damage Motor damage 292 3 Input voltage low Slave2 4 Outdoor unit inverter PCB assembly dam 293 age E Error diagnosis and countermeasure flow chart 1 Check pipe clogging distortion f f 2 Check covering Indoor outdoor unit Is installation 3 Check EEV connector assemble condition normal condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found 1 Check resistance between each terminal of compressor 0 34 0 35Q 7 2 Check insulation resistance between compressor terminal and pipe over 50MQ 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 Is compressor connection condition wire connection 2 Check wire disconnection and wiring condition normal 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Check R S S T T R phase voltage is 380V 10 Is input voltage normal R N S N T N phase vo
112. right reserved 111 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide ig Error type Error point Main reasons 22 1 Overload operation Pipe clogging Covering EEV defect Ref Master Pata overcharge 291 nverter ASD 2 Compressor damage Insulation AC input current over error input 3 phase power damage Motor damage Slave1 current is over limited 4 innit vokaae low 222 value 22A soap f 9 4 Power line misconnection Slave2 5 Inverter PCB assembly damage 223 Input current sensing part 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 1 Check resistance between each terminal of compressor Are the resistance 0 34 0 350 7 F between gach prase and 2 Check insulation resistance between compressor insulation resistance of Inverter terminal and pipe over 50MQ compressor normal 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 Is compressor wire connection condition normal Check con
113. rmal Replace inverter PCB assembly Recheck power and installation condition Measuring input voltage Inverter PCB assembly power wiring Copyright 2008 LG Electronics Inc All right reserved 116 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide ae Error type Error point Main reasons 26 1 Overload operation Pipe clogging Covering EEV defect Ref Master Hees 261 Inverter compressor starting Starting failure because of failure error compressor abnormality 2 Compressor damage Slave Insulation damage Motor damage 262 3 Compressor wiring failure Slave2 4 Outdoor unit inverter PCB damage CT 263 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 1 Check resistance between each terminal of compressor 0 34 0 35Q 7 2 Check insulation resistance between compressor terminal and pipe over 50MQ 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 connecti
114. rnal Use Only HR Unit PCB 2 Selection of the model of the HR unit For 2 rooms For 3 rooms For 4 rooms PRHR020 PRHR040 PRHR040 a BOOD 3 4 5 6 7 8 1 room connected 2 rooms connected 3 rooms connected 4 rooms connected 3x Each model is shipped with the switches No 2 and No 3 pre adjusted as above in the factory 4h WARNING If you want to use a PRHRO30 for 2 rooms HR unit after closing the 3rd pipes set the dip switch for 2 rooms HR unit If you want to use a PRHR040 for 3 rooms HR unit after closing the 4th pipes set the dip switch for 3 rooms HR unit If you want to use a PRHR040 for 2 rooms HR unit after closing the 3rd and 4th pipes set the dip switch for 2 rooms HR unit The unused port must be closed with a copper cap not with a plastic cap Copyright 2008 LG Electronics Inc All right reserved 59 Only for training and service purposes LGE Internal Use Only HR Unit PCB 3 Setting the Valve group Indoor unit Dip switch setting Indoor unit Not control Indoor unit Indoor unit Indoor unit No 1 2 valve Indoor unit l control Large capacity indoor unit Indoor unit Large capacity indoor unit control RT main Indoor unit No 2 3 valve No 3 4 valve Large capacity indoor unit Indoor unit control Indoor unit No 1 2 va
115. rol Maintain evaporating temperature Te to be constant on cooling mode and condensing tem perature Tc on heating mode by Fuzzy control to ensure the stable system performance Tc 47 51 C Te 2 5 C 1 Cooling mode Te can be set by initial dip switch setting Normal mode capacity up mode and energy save mode 2 Heating mode Tc can be set by initial dip switch setting Normal mode capacity up mode and energy save mode Note By setting dip switch Te and Tc are decided simultaneously gt TR RE Bag TPP T 7 PT TTT TTT TTT ke HEHE re p Constant Speed Compressor Linear Control B Pr amp Comperssor Fuzzy control start Target System Capacity LA Constant Speed Constant Speed Compressor Compressor II Le A A y Comperssor Min frequency Stop OHz Constant Speed Constant Speed Constant Speed Compressor Compressor Compressor ln B B B Comperssor Fuzzy Control Cooling and heating load Inverter linear control as cooling and heating load increasing Copyright 2008 LG Electronics Inc All right reserved 20 Only for training and service purposes LGE Intemal Use Only Functions 1 3 Master and Slave Unit s EEV Control 1 Main EEV control Main EEV operates with fuzzy control rules to keep the degree of super Heat Superheat about 3 C at the evaporator outlet stable during heating mode The degree of Superheat Tsuction Tevaporation Tsuction temperature at
116. rror point Main reasons HR unit e Defective temperature sensor connection 203C HR Sub cooling discharge Abnormal value of sensor e Defective temperature sensor pipe temperature sensor error measurement Open Short E Error diagnosis and countermeasure flow chart 1 Check connection condition of temperature sensor and lead cable 2 Is value of temperature sensor normal If not replace sensor Piping temperature sensor 10 C 10kQ 25 C 5kQ 50 C 1 8kQ 3 If connection of sensor and value is correct replace outdoor unit PCB B HR unit error display No Open Short e Defective outdoor unit PCB HR Unit HR 1 HR 2 HR 3 HR 4 HR 5 HR 6 HR 7 HR 8 HR 9 HR 10 HR 11 HR 12 HR 13 HR 14 HR 15 HR 16 Error display C01 C02 C03 C04 C05 coe C07 C08 C09 C10 C12 C14 C16 B Example of HR unit error display 16 HR unit Sub cooling inlet pipe temperature sensor error 200 3 C16 Repeat C HR unit HR unit Nuber Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 159 LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 1 Defective connection in HR unit power 204C HR Transmission error Ca supply and transmission connection between the HR unit Ta abaka 2 Wrong setting of the HR u
117. rter PCB assembly power connection normal Is inverter PCB assembly normal Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 gt Check connection condition and wiring if power is abnormal Check connection between inverter PCB assembly and bridge diode misconnection disconnection gt wiring again if abnormality found Recheck power and installation condition Copyright 2008 LG Electronics Inc All right reserved 114 Only for training and service purposes Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly LGE Internal Use Only Troubleshooting Guide Inverter PCB amp bridge diode wiring Measuring input voltage Copyright 2008 LG Electronics Inc All right reserved 115 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error H No Error type Error point Main reasons 25 no Input voltage is over limited 1 Input voltage abnormal T N Input voltage high low value of the product 173V 2 Outdoor unit inverter PCB assembly dam a or less 289V or more age input voltage sensing part Slave2 253 E Error diagnosis and countermeasure flow chart Check R S S T T R phase voltage is 380V 10 Is input voltage normal R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Is inverter PCB assembly no
118. rts by high discharge temperature of compressor etc Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 24 LGE Internal Use Only 2 3 Stopping Operation 2 3 1 Stopping operation on cooling mode Component Operation Functions Inverter compressor OHz Constant speed compressor OFF FAN Stop Main EEV Max pulse After 15 min Before 15 min Min pulse Subcooling EEV Max pulse After 15 min Before 15 min Min pulse 4way valve OFF Hot gas bypass valve OFF 2 3 2 Stopping operation on heating mode Component Operation After 15 min Before 15 Min ON Inverter compressor OHz Constant speed compressor OFF FAN Stop Main EEV Max pulse After 15 min Before 15 min Min pulse Subcooling EEV Max pulse After 15 min Before 15 min Min pulse 4way valve OFF After 60 min Hot gas bypass valve Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes OFF 25 After 15 min Before 15 Min ON LGE Internal Use Only Functions 3 1 Pressure Protection Control 3 1 1 Pressure control on cooling mode B High pressure control Pressure range Compressor Fan Pa 4003 kPa Stop Stop Pa gt 3676 kPa 5Hz 4sec 100RPM 4sec Pa 3448
119. s 3 Refrigerant shortage leakage because of 3 times 4 Deformation because of damage of refrigerant pipe ee Excessive drop of heee 5 Defective indoor outdoor unit EEV discharge pressure 6 Covering clogging Slave1 of compressor sive drop of low pres outdoor unit covering during the cooling mode 352 sure by the low pres indoor unit filter clogging during heating mode Slave2 ellie Sensor 7 SVC valve clogging 353 8 Defective outdoor unit PCB 9 Defective indoor unit pipe sensor E Error diagnosis and countermeasure flow chart Is service valve opened Open service valve Yes Check transmission piping correction Are transmission cable piping normal Yes Is amount of refrigerant normal refer refrigerant part No No Adjust the amount of refrigerant Additive charge Is there pipe crack or trace of refrigerant leakage Yes Yes Weld reconnect the cracked portion and recharge refrigerant Is fan normal in heating outdoor fan in cooling indoor fan No Check and replace related parts error 105 108 reference Yes No z Is strainer Ok Note1 Replace the strainer Yes Are the values of manifold and low pressure sensor same Is the low pressure value actually low No Replace the pressure sensor Yes Note1 If the temperature difference between inlet and outlet of Gheck indoor outdoor unit EEV strainer is so large that frost or ice forma
120. s LGE Intemal Use Only est Rn 2 Settings of slave outdoor unit Funetion SW01B setting SW02B setting Remarks Slave 1 Slave 3 Remarks Unit back up Copyright 2008 LG Electronics Inc All right reserved 75 Only for training and service purposes LGE Internal Use Only Replacement Procedure for Compressor ARUB80LT2 to ARUB480LT2 1 Replacement Procedure for COMPreSSOF sscssceeeeseeesseees 77 Copyright 2008 LG Electronics Inc All right reserved 76 Only for training and service purposes LGE Internal Use Only Replacement Procedure for Compressor ARUB80LT2 to ARUB480LT2 E Replacement Procedure for Compressor ARUB80LT2 to ARUB480LT2 1 Collect the refrigerant by using refrigerant recov ery unit Since the setting on outdoor unit PCB is required for refrigerant recovery refer to the warming plate Precautions in service work attached on the switch box cover 2 Remove the sound insulator mat covering the faulty compressor and disconnect the power 3 Disconnect the brazing sections of suction pipe and discharge pipe by using brazing torch after the refrigerant has been collected completely 4 Remove equalizing pipe nut 5 Remove three bolts at cushion rubber section to take out the faulty compressor outside the unit 6 Install the new compressor in the unit Be sure to insert the cushion rubbers before tightening the fixing bolts of compressor 7 Remove the ru
121. se of error 4 Master outdoor unit fan PCB heat Master outdoor unit fan PCB heat sink temperature 5 sink temperature sensor error sensor open or short Slave1 outdoor unit fan PCB Slave1 outdoor unit fan PCB heat sink temperature 2 2 heat sink temperature sensor sensor open or short g 1l9 l4 error S Slave2 outdoor unit fan PCB Slave2 outdoor unit fan PCB heat sink temperature 5 3 heat sink temperature sensor sensor open or short 3 error o 4 Slave3 outdoor unit fan PCB heat Slave3 outdoor unit fan PCB heat sink temperature sink temperature sensor error sensor open or short 2 0 0 1 Searching pipe error Failure of automatic addressing of valves 2 2 0 1 C R HR unit1 ligiud sensor error Liquid pipe sensor of HR unit open or short o 5 2l0 2 adr HR unit1 sub cooling pipe in sen Sub cooling pipe in sensor of HR unit open or short 5 sor error 21013 kian HR unit1 sub cooling pipe out sen Sub cooling pipe out sensor of HR unit open or short 5 sor error cc T 2 0 4 C R Communication error Failing to receive HR unit signal at outdoor unit C HR unit HR unit nuber Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 101 LGE Internal Use Only Troubleshooting Guide ed Error type Error point Main reasons 01 Indoor unit air sensor error 1 Indoor unit PCB wrong connection 2 Indoor unit PCB failure 3 Sensor problem main reason 02 Indoor unit pipe inlet sensor
122. se ot nign pres __ outdoor unit is blocked during cooling a SUTE Dy NigiipraSsura Indoor unit filter is blocked during heati g heating Slave2 sensor 343 7 SVC valve is clogged 8 PCB defect of outdoor unit 10 Indoor unit pipe temperature sensor defect E Error diagnosis and countermeasure flow chart No Is service valve opened Yes Are transmission cable pipe connection normal No Yes Is refrigerant amount normal refer refrigerant part No Yes Is fan normal Indoor fan during heating Outdoor fan during cooling No Yes Is filter blocked Heating indoor Cooling outdoor heat exchanger No Yes Is value of high pressure sensor same as manifold value Is it high actually No Yes Check indoor unit EEV Check indoor unit PCB Check in outdoor installation condition Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes Open service valve Check and repair transmission cable pipe connection Adjust refrigerant amount Replace related parts Refer to Error 105 107 Clean indoor filter heating outdoor heat exchanger cooling Replace sensor of high pressure 123 LGE Internal Use Only Troubleshooting Guide ra Error type Error point Main reasons 1 Defective low pressure sensor 2 Defective outdoor indoor unit fan 35 Error happen
123. service purposes LGE Internal Use Only Self diagnosis function Display Title Cause of error Communication error between Failing to receive slave unit signal at main PCB of mas 1 master outdoor unit and other out ter outdoor unit door unit Communication error between Failing to receive master and other slave unit signal at 2 slave1 outdoor unit and other out main PCB of slave1 outdoor unit door unit 1 0 4 iF ra Communication error between Failing to receive master and other slave unit signal at 3 slave2 outdoor unit and other out main PCB of slave2 outdoor unit door unit Communication error between Failing to receive master and other slave unit signal at 4 slave3 outdoor unit and other out main PCB of slave3 outdoor unit door unit 4 Master outdoor unit fan PCB com Failing to receive fan signal at main PCB of master munication error unit 2 Slave1 outdoor unit fan PCB com Failing to receive fan signal at main PCB of slave1 iale munication error unit 3 Slave2 outdoor unit fan PCB com Failing to receive fan signal at main PCB of slave2 munication error unit a 4 Slave3 outdoor unit fan PCB com Failing to receive fan signal at main PCB of slave3 g munication error unit o g 1 Master outdoor unit fan IPM fault Instant over current at master outdoor unit fan IPM T error o r 2 Slave1 outdoor unit fan IPM fault Instant over current at slave
124. sor fault OR drive pressor over current fault Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 92 LGE Internal Use Only Self diagnosis function Display Title Cause of error Master outdoor unit inverter com System is turned off by master outdoor unit inverter 1 pressor high discharge tempera compressor high discharge temperature ture Slave1 outdoor unit inverter com System is turned off by slave1 outdoor unit inverter 2 pressor high discharge tempera compressor high discharge temperature ture 2 ae ae 8 Slave2 outdoor unit inverter com System is turned off by slave2 outdoor unit inverter 3 pressor discharge high tempera compressor high discharge temperature ture Slave3 outdoor unit inverter com System is turned off by slave3 outdoor unit inverter 4 pressor high discharge tempera compressor high discharge temperature ture Master outdoor unit constant System is turned off by master outdoor unit constant 1 speed compressor high discharge speed high discharge temperature temperature Slave1 outdoor unit constant System is turned off by slave1 outdoor unit constant 5 2 speed compressor high discharge speed high discharge temperature 5 temperature 3 F 3 F E Slave2 outdoor unit constant System is turned off by slave2 outdoor unit constant S 3 speed compressor high discharge speed hig
125. sor open or short 5 sensor fault O 4 Slave3 outdoor unit low pressure Slave3 outdoor unit low pressure sensor open or short sensor fault 4 Master outdoor unit high pressure Master outdoor unit high pressure sensor open or short sensor fault 2 Slave1 outdoor unit high pressure Slave1 outdoor unit high pressure sensor open or short sensor fault 4 3 a 3 Slave2 outdoor unit high pressure Slave2 outdoor unit high pressure sensor open or short sensor fault 4 Slave3 outdoor unit high pressure Slave3 outdoor unit high pressure sensor open or short sensor fault 4 Master outdoor unit air tempera Master outdoor unit air temperature sensor open or ture sensor fault short 2 Slave1 outdoor unit air tempera Slave1 outdoor unit air temperature sensor open or ture sensor fault short 4 4 3 Slave2 outdoor unit air tempera Slave2 outdoor unit air temperature sensor open or ture sensor fault short 4 Slave3 outdoor unit air tempera Slave3 outdoor unit air temperature sensor open or ture sensor fault short Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 94 LGE Internal Use Only Self diagnosis function Display Title Cause of error Master outdoor unit heat Master outdoor unit heat exchanger temperature sen 1 exchanger temperature sensor A sor A open or short fault Slave1 outdoor unit heat Slave1 outdo
126. suction pipe sensor C Tevaporation evaporation temperature equivalent to low pressure C 2 Subcooling EEV control about 15 C Subcooling EEV works with fuzzy rules to keep the degree of Subcool at the outlet of subcooler during cooling mode The degree of Subcool Tcondensation Tliquid Tliquid temperature at outlet of subcooler C Tcondensation condensation temperature equivalent to high pressure C 3 Avoiding excessive high discharge temperature when main EEV opens some given opening R410A 800 pls and discharge temperature is above 85 C in heating operation subcooling EEV may control the subcooling out temperature evaporating temperature to be some given difference Copyright 2008 LG Electronics Inc All right reserved 21 Only for training and service purposes LGE Internal Use Only Functions 2 1 Oil Return Control 2 1 1 Oil return control on cooling mode Oil return operation recovers oil amount in compressor by collecting oil accumulated in pipe Each cycle component operates as following table during oil return operation Outdoor Unit Component Starting Running Ending Inverter compressor 25Hz Setting Value 40Hz Constant speed compressor OFF ON OFF FAN Normal control Normal control Normal control Main EEV Max pulse Max pulse Max pulse Subcooling EEV Normal control Main pluse 100 pulse 4way valve OFF
127. tch and dip switch After reset of power of outdoor and HR unit wait for more than 30 minutes temperature of pipes will be cool dow then do auto addressing 4 If indoor unit quantity is different between installed quantity and quantity which check thru piping searching check pipe installation condition Outdoor unit HR unit lt gt Indoor unit 5 If indoor unit has not been connected to 1 valve of HR unit set pipes of HR unit manually 6 If it is not applied as above set pipes of HR unit as manual NB How to check display method of outdoor main PCB 7 segment 88 gt Indoor qty which check thru Auto Addressing gt 88 gt Indoor qty which check thru piping checking Copyright 2008 LG Electronics Inc All right reserved 158 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide Error No Error type Error point Main reasons e Defective temperature sensor connection 201C HR HR unit liquid pipe tem Abnormal value of sensor e Defective temperature sensor perature sensor error measurement Open Short Open Short e Defective outdoor unit PCB Error No Error type Error point Main reasons HR unit e Defective temperature sensor connection Sub cooling inlet pipe Abnormal value of sensor Defective temperature sensor 202C HR Open Short temperature sensor measurement Open Short Open Short error e Defective outdoor unit PCB Error No Error type E
128. ted with indoor unit If addresses are piled up corresponding valve is not working e If you want to change the setting of manual pipe you should do it on HR unit PCB elf an error occurred it means that manual pipe setting is not completed Copyright 2008 LG Electronics Inc All right reserved 63 Only for training and service purposes LGE Internal Use Only HR Unit PCB 1 Flow chart for auto addressing Turn HR unit indoor unit and outdoor unit on in the order named Wait for 3 minutes Press SWO2V of the outdoor unit main PCB for 5 seconds 88 is displayed on outdoor unit main PCB and HRunit PCB The number of the indoor units connected is displayed at 7 SEG of the outdoor unit main PCB after 2 7 minutes The number of HR units connected is displayed at 7 SEG of the outdoor unit main PCB Are the number of indoor units connected to the outdoor unit wiring and displayed one equal Ye Check power and communication wiring between gt outdoor HR and indoor units J Retry indoor unit auto addressing after checking trouble Completion of auto addressing Incompletion of auto addressing Copyright 2008 LG Electronics Inc All right reserved 64 Only for training and service purposes LGE Internal Use Only HR Unit PCB 2 Flow chart for auto pipe detection Confirmation of indoor unit address setting Outdoor unit is operated for 5 30 minues Turn No 1 of SWO2M of HR
129. ter 9 min on heating mode and 4 min on cooling mode from the compressor running 3 5 Phase Detection B Main unit If a phase is missed 7 segment displays 50 on main PCB If phases are reversed 7 segment displays 54 on main PCB 3 6 Pressure Switch Main PCB has pressure sensing switch in series between compressor and power relay The state of pressure sensing switch is normally on It has small electric current from 220V AC Never touch the connecting terminal with hand nor short two wires directly Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 28 LGE Internal Use Only Functions 4 Other Co 4 1 Initial Setup There are 4 initial setup steps before running All dip switch setting must be completed before initial setup 1 mr Step 1 factory setting value display Factory setting value is displayed in 7 segment on PCB for 24sec All dip switches must be set properly before step 1 Power is on Master model code is displayed 3sec EL Slave1 model code is displayed 3sec fo Slave2 model code is displayed 38sec Total capacity including slave units is displayed 2sec l C kaa Heat recovery Display 2 Factory setting 25 is normal Outdoor unit type Copyright 2008 LG Electronics Inc All right reserved 29 Only for training and service purposes LGE Intemal Use Only Functions 2 Step 2 Communication check If a
130. ter compressor Stop 60 Hz 40 Hz High pressure gas valve Keep Close Open or Close Low pressure gas valve Keep Open Open or Close Balancing valve Open for 30s Close Close 2 2 Liquid Bypass Control Indoor units operating Ja Are whole indoor units operating cooling mode Solenoid valve open for liquid bypass High pressure gas gt Low pressure gas valve 2 3 Subcooling EEV Control Target about 15 C Subcooling EEV works with Fuzzy rules to keep the degree of subcooling at the outlet of subcooler during simultaneous operation The degree of subcooler T outlet of subcooler T inlet of subcooler Copyright 2008 LG Electronics Inc All right reserved 55 Only for training and service purposes LGE Internal Use Only tting and Test Run Copyright 2008 LG Electronics Inc All right reserved 56 Only for training and service purposes LGE Internal Use Only Il PCB Setting and Test Run PRUNE PGB paa ANNA AA DAA 58 1 Switch tor Setup of HR Unit ABAD 58 2 Method for Addressing of Indoor and HR Unit 62 3 Flow Chart for Auto Addressing of Indoor and HR Unit eneen 64 4 Example of Manual Valve AddreSSing cscccceeeeeeeeeeeeeeeeeeneeeeneeeeeeeeeeeeeeeeeeeeeeees 67 5 Example of Checking Valve Address nnn oannnnnnnenenenenenennneennennnnnnnneneenenn 68 6 Identification of Manual Valve ID Address s ssssseeseeeee
131. tion can be seen or Check Indoor unit PCB i 3 h Check indoor outdoor unit confirmed then clogging of strainer should be checked installation conditions Notice it is not full ice forming of strainer in case that there is not at inlet portion but at outlet portion Copyright 2008 LG Electronics Inc All right reserved 124 Only for training and service purposes LGE Intemal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 40 Master f ee 401 Inverter compressor CT Micom input voltage isn t 1 Input voltage abnormal T N Seca ay within 2 5V 0 3V at initial 2 Outdoor unitinverter PCB damage pig state of power supply CT sensing part Slave2 403 E Error diagnosis and countermeasure flow chart Check R S S T T R phase voltage is 380V 10 Is input voltage normal R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Is inverter PCB assembly normal Replace inverter PCB assembly Yes Recheck power and installation condition Measuring input voltage LGMV Part Fleet Casa Grek Come Mijl Seere Febr herz inn Copyright 2008 LG Electronics Inc All right reserved 125 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 41 Inverter 1 Defective connection of the hase ENT co
132. um mode cancellation method Main PCB SW02B Master Main PCB Dip switch OFF No 11 14 ee ag Outdoor unit power reset Vacuum mode cancellation A CAUTION Outdoor unit operation stops during vacuum mode Compressor can t operate Copyright 2008 LG Electronics Inc All right reserved 45 Only for training and service purposes LGE Internal Use Only Functions 4 12 Black Box Function This function saves data immediately before the error occurs in outdoor unit main PCB and thus making error analysis cause possible Data loading method Indoor unit outdoor unit stop Press the black button 5 sec EEPROM Main micom data loading Yellow LED LED01C stops when data is loading After completion it is starts blinking about 20 sec EEPROM data save to PC by using lt Save EEP data gt in LGMV B Saving process Making data Save EEP data Data saving place select File save nn BB LGMV5 For Multi V by HSJ E lol x Main M Cycleview C Graph G Control IDUs I Setting Making Data Help Making Data Help OutLEV Drcrren OULEVGI De comp2 Main Savet Save2 __ Seve3 ors Qc compt Dc coms Le Cid SCLEV Quan SCS Dia nr cz a tit inv Target oro oms Quan Dua ores Fan Target oso Ootes Deotoss s1 St ewa a sway sways _ _ _
133. unit inverter com The first start failure by master outdoor unit inverter pressor start failure compressor abnormality o 2 Slave1 outdoor unit inverter com The first start failure by slave1 outdoor unit inverter E 216 pressor start failure compressor abnormality 3 Slave2 outdoor unit inverter com The first start failure by slave2 outdoor unit inverter pressor start failure compressor abnormality 4 Slaves outdoor unit inverter com The first start failure by slave3 outdoor unit inverter pressor start failure compressor abnormality 4 Master outdoor unit inverter DC System is turned off by master outdoor unit DC voltage link high voltage over charging 2 Slave1 outdoor unit inverter DC System is turned off by slave1 outdoor unit DC voltage 2 8 link high voltage over charging 3 Slave2 outdoor unit inverter DC System is turned off by slave2 outdoor unit DC voltage link high voltage over charging 4 Slave3 outdoor unit inverter DC System is turned off by slave3 outdoor unit DC voltage link high voltage over charging 1 Master outdoor unit inverter com Master outdoor unit inverter compressor fault OR drive pressor over current fault 2 Slave1 outdoor unit inverter com Slave1 outdoor unit inverter compressor fault OR drive 2 9 pressor over current fault 3 Slave2 outdoor unit inverter com Slave2 outdoor unit inverter compressor fault OR drive pressor over current fault 4 Slave3 outdoor unit inverter com Slave3 outdoor unit inverter compres
134. untermeasure flow chart Replace cabled remote controller Check connection amp transmission cable Does the error happens again if the remote controller is replaced Does the error occurred when the cable of remote controller is replaced Replace indoor unit PCB If there is no remote controller to replace Use another unit s remote controller doing well Check cable Contact failure of connected portion or extension of cable are main cause check any surrounded noise check the distance with main power cable gt make safe distance from the devices generate electromagnetic wave After replacing indoor unit PCB do auto addressing amp input unit s address if connected to central controller All the indoor units connected should be turned on before auto addressing PCRBBTOAROI SIT RUBE TVANISE 2 6871410368 BB71A1023177 aging iie 6871A10363 17 CN REMO Remote controller connection ae won x The PCB can differ from model to model Check from the right source Checking transmission cable connection status Copyright 2008 LG Electronics Inc All right reserved 103 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 04 Drain pump error Float switch is open due to 1 Drain pump float switch failure rising of condensate water 2 Improper drain pipe locat
135. ure gas pipe Liquid pipe High pressure gas pipe ney Solenoid EEV Sensor adid sey edid pinbi adid sey edid pinbig adid sey Cc a o 3 O o edid pinbrq adid sey To be switched operation between cooling and heating by two Solenoid valve To be used decreasing noise according to sub cooling of inlet and outlet of indoor unit Simultaneous operation To prevent liquid charging between high pressure gas valve and HR unit at cooling mode To be controlled the pressure between high and low pressure pipe during operation switching Be LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes Wiring Diagrams Hi 5 Wiring Diagrams 5 1 HR L VALVEO1L A VALVEO1H VALVEO2H VALVE03L VALVE03H VALVE04L VALVE04H VALVE03 VALVE04 VALVEO2L 7 lt dp lt AC TRANS IN 2 dog ER CN04 LEH VALVEO2 o o o o 0 fo fo fol CN05 CNO6 CNO7 CN0B8 CNO9 CN10 CN11 O CN12 CN13 MAIN C POWER IN 01 BOARD CN15 CN14 yel LEvo2 LEVO1 BR BE B3 ele1e 0 010 SENEN FUSE 250V T3 15A CN19 ff LILI SWO5M HRUNITID SW01M 4 NO TO INDOOR UNIT ig aaa CN17 e 0 0 010 0 CN16 OFF 0 SWO3M SWo4M ON S
136. uring values appear largely differently depending on measuring tools 1 If using a movable tester when checking that output voltage of the inverter is constant when comparing rela tive voltage between lines always use an analog tester Especially exercise particular caution if the output frequency of the inverter is low when using a movable tester where change of measured voltage values is large between other lines when virtually same values appear actually or where there is danger to determine that failure of the inverter occurred 2 You can use rectification voltmeter if using commercial frequency tester when measuring output values of the inverter when measuring absolute values Accurate measuring values cannot be obtained with a general movable tester For analog and digital mode Copyright 2008 LG Electronics Inc All right reserved 82 Only for training and service purposes LGE Intemal Use Only Checking item Symptom Countermeasure 1 The fan motor does not 1 When power supply is Modify connection status in front of or at the rear of operate abnormal the breaker or if the power terminal console is at Does failure appears frosting condition again when starting Modify the power supply voltage is beyond speci operation fied scope 2 For wrong wiring For following wiring 2 Vibration of the fan 1 Check connection status motor is large 2 Check contact of the connector 3 Check that
137. uto pipe detection fails complete it with manual pipe detection See manual pipe detection When auto pipe detection addressing is completed normally manual pipe detection is not required If you want to do auto pipe detection again after auto pipe detection fails do after reset of outdoor unit by all means np 3 Manual pipe detection e Enter the central control address into each indoor unit using its wired remote control eTurn No 1 of SWO2M of HR unit PCB on e Reset the power of HR unit PCB e On the HR unit PCB manually set address of each valve of the HR unit to the central control address of the indoor unit connected to the valve e Turn No 6 of SW03M of outdoor unit PCB on e Reset the power of outdoor unit PCB e The number of the indoor unit installed is displayed after about 5 minutes ex Ex HR The number of the indoor e Turn No 6 of SWO3M of outdoor unit PCB off e Reset the power of outdoor unit PCB e Manual pipe detection is completed Ah WARNING e In case that central controller is not installed remain the address data after installer sets central control address as he wants e In case that central controller is installed there would be central control address in wired remote control of indoor unit e In this case set the HR unit manual pipe address according to central control address of indoor unit e Pipe which is not connected with indoor unit should be set different address with pipe connec
138. w chart After outdoor unit main PCB reset error code disappears After Auto addressing error code disappears Copyright 2008 LG Electronics Inc All right reserved 109 Only for training and service purposes Replace indoor unit 485 transmission PCB LGE Internal Use Only Troubleshooting Guide Error No Error type Error point Main reasons 1 Over current detection at Inverter compres 24 sor U V W 2 Compressor damaged insulation dam aged Motor damaged Master IPM self protection circuit 3 IPM overheating 211 Inverter PCB Assy IPM fail activation Heat sink fan damaged Heat sink fan con Slave1 ure occur Overcurrent IPM overheat nector disconnected Heat sink disassem 212 ing Vcc low voltage bled Slave 4 Inverter compressor terminal disconnected 213 or loose 5 Inverter PCB assembly damaged 6 Outdoor unitinput current low E Error diagnosis and countermeasure flow chart Are the resistance Between each phase and compressor normal Is compressor wire connection condition normal Is inverter heat sink cooling fan normal Is inverter PCB assembly normal Recheck power and installation condition insulation resistance of Inverter 1 Check resistance between each terminal of compressor 0 34 0 35Q 7 2 Check insulation resistance between compressor terminal and pipe over 50MQ Replace compressor if abnormal
139. y Main 2 During the process of judging refrigerant amount if ane iB __ Set the dip switch the cycle isn t stable refrigerant checking function SOE Refrigerant checking 1 2 7 14 ON may end without performing refrigerant checking Main PCB Press the black button on main PCB bog SWO1V Press until 608 is displayed Main PCB Press the black button on main PCB 18 SWO01V Indoor unit runs with cooling mode in order Judging refrigerant amount roti rao Lin Litt Excess of Scarcity of Impossible refrigerant refrigerant to judge Note 2 Indoor unit outdoor unit are turned off Encl Main PCB Press the black button on main PCB J Jj H SWO1V ma Press the black button for 2 sec after aww turning off all of dip switch a LA Completed Copyright 2008 LG Electronics Inc All right reserved 36 Only for training and service purposes LGE Intemal Use Only Functions Ay caution 1 Guaranteed Temperature range Error occurs out of guaranteed temperature range Indoor unit 20 32 C buffer 1 C Outdoor unit 10 38 C buffer 1 C 2 Set Indoor unit wired remote controller temperature sensor setting as Indoor unit 3 Make certain that Indoor unit doesn t run with thermo off mode during operation Error contents about auto refrigerant charging function ha MATA Temperature Range error In case that indoor unit or outdoor unit is out of range roo wi
140. y and pull up coil part upward When the coil part is removed or assembled be careful not to bend the pipe of the body Ha A part Copyright 2008 LG Electronics Inc All right reserved 85 Only for training and service purposes LGE Internal Use Only Checking Method for Key Components e EEV failure check method Failure mode Diagnosis Repair process Unit Microcomputer 1 Disconnect the EEV connector form control board and Check and replace Indoor driving circuit connect testing LED Indoor unit control unit failure e o board e O e i O e i o e i o e gt O 1K LED 2 Main power ON pulse signal is out from EEV for 17 sec If LEDs do not turn on or are in on state continuously then driving circuit is abnormal EEV locking 1 If EEV is locked in no load state the driving motor rotate Replace EEV Indoor and clicking sound always occurs Outdoor unit EEV motor coil 1 Check the resistance between coil terminal Replace EEV Outdoor short or red white red yellow red orange red blue unit misconnection 2 If the estimated resistance value is in 52 3Q then the EEV is normal 1 Check the resistance between coil terminal Replace EEV Indoor brown white brown yellow brown orange brown blue unit 2 If the estimated resistance value is in 150 100 then the EEV is normal Full closing 1 Operate indoor unit with fan mode and operate another If the amount of Indoor valve

System Heat Recovery Outdoor Unit SERVICE MANUAL R410A

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