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LG MULTI V IV ARNU07GTU 2 Series Service Manual
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LG MULTI V IV ARNU07GTU 2 Series Service Manual

LG MULTI V IV ARNU07GTU 2 Series Service Manual

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Internal Use Only
http://biz.lgservice.com
Outdoor Unit
R410A
SERVICE MANUAL
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.

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Summary of Contents for LG MULTI V IV ARNU07GTU 2 Series

  • Page 1 Internal Use Only http://biz.lgservice.com Outdoor Unit R410A SERVICE MANUAL CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.

  • Page 2: Table Of Contents

    Part 2 Outdoor Units ....................15 Part 3 PCB Setting and Test Run ................49 Part 4 Trouble shooting guide................54 - 2 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    • There is risk of fire, electric shock, explosion, or • There is risk of fire, electric shock, explosion, or injury. injury. - 3 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 4 Should the refrigerant leak and cause the safety limit to be exceeded, harzards due to lack of oxygen in the room could result - 4 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 • To avoid vibration or water leakage. • If the gas leaks and accumulates around the unit, an explosion may result. - 5 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 • If the base collapses, the air conditioner could erate heat and cause a fire. fall with it, causing property damage, product failure, or personal injury. - 6 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 • Be careful and avoid personal injury. • There are sharp and moving parts that could cause personal injury. - 7 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Part 1 General Information

    2.2 Outdoor Unit ............12 3. Combination of Outdoor Units ........13 4. Nomenclature..............14 4.1 Indoor Unit .............14 4.2 Outdoor Unit ............14 - 8 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Model Names

    *ART COOL- SE/S8( * R:Mirror, V:Silver), SF(* E:Red, V:Silver, G:Gold , 1: Kiss (Photo changeable)) *Wall Mounted- A: Basic, L:Plasma, *Ceiling Cassette- A: Basic, C:Plasma - 9 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Outdoor Unit

    3Ø, 380 ~ 415V, 50Hz 720LTE4 740LTE4 760LTE4 780LTE4 800LTE4 3Ø, 380V, 60Hz 720LTS4 740LTS4 760LTS4 780LTS4 800LTS4 Heat Pump ARUN - 10 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: External Appearance

    * A:Basic, C:Plasma h In matters of combination with Outdoor unit system, refer the PDB of that outdoor units. - 11 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: Outdoor Unit

    ARUN440LTE4/LTS4 ARUN460LTE4/LTS4 ARUN480LTE4/LTS4 ARUN500LTE4/LTS4 ARUN520LTE4/LTS4 ARUN540LTE4/LTS4 ARUN560LTE4/LTS4 ARUN580LTE4/LTS4 ARUN600LTE4/LTS4 ARUN620LTE4/LTS4 ARUN720LTE4/LTS4 ARUN640LTE4/LTS4 ARUN740LTE4/LTS4 ARUN660LTE4/LTS4 ARUN760LTE4/LTS4 ARUN680LTE4/LTS4 ARUN780LTE4/LTS4 ARUN700LTE4/LTS4 ARUN800LTE4/LTS4 - 12 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Combination Of Outdoor Units

    ARUN440LTE4/LTS4 ARUN460LTE4/LTS4 ARUN480LTE4/LTS4 ARUN500LTE4/LTS4 ARUN520LTE4/LTS4 ARUN540LTE4/LTS4 ARUN560LTE4/LTS4 ARUN580LTE4/LTS4 ARUN600LTE4/LTS4 ARUN620LTE4/LTS4 ARUN640LTE4/LTS4 ARUN660LTE4/LTS4 ARUN680LTE4/LTS4 ARUN700LTE4/LTS4 ARUN720LTE4/LTS4 ARUN740LTE4/LTS4 ARUN760LTE4/LTS4 ARUN780LTE4/LTS4 ARUN800LTE4/LTS4 - 13 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: Nomenclature

    Cooling Only or Heat Pump N: Inverter and H/P V: Inverter and C/O System with Outdoor Unit using R410A - 14 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Part 2 Outdoor Units

    Part 2 Outdoor Units - 15 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 ARUN Series • Function ..................17 - 16 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 4.13 Night Low Noise Function ..................45 4.14 Vacuum Mode ......................46 4.15 Static pressure compensation mode................46 4.16 Cool & Heat selector ....................47 - 17 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: Basic Control

    Comp 1 Comp 1 Cooling and heating load Fuzzy Control Inverter linear control as cooling and heating load increasing - 18 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Master And Slave Unit's Eev Control

    - Td ≤ 80℃ : VI_SH = 3℃ - 80℃<Td ≤ 90℃ : VI_SH = -2*Td/10 + 19 - 90℃<Td : VI_SH = 1℃ - 19 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Special Control

    Starting condition : When low oil level which is measured by oil level sensor is kept continuously then oil return operation will be start. n Oil return process ends if compressor protection control starts - 20 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Oil return operation time : 3 min for running step n Starting condition:same as cooling mode n Oil return process ends if compressor protection control starts - 21 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 2) The running time of defrost operation is over 30% of the total heating time 3) If compressor protection control starts by high discharge temperature of compressor etc. - 22 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: Partial Defrost

    1) Upper defrost ending condition over setting temperature. 2) Low defrost ending condition over setting temperature. 3) Max. 12 minutes - 23 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Oil Equalizing Control

    When oil level which is measured by oil level sensor is kept differently between each compressor then oil equalizing EEV will be open during 5 minutes. - 24 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Protection Control

    ≥ 190 kPa Normal control Normal control h Frequency holding : frequency (or RPM) is not increasing ( can decrease ). - 25 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Discharge Temperature Control

    41A or more h AC input current is input current of inverter compressor except constant current (current pass through noise filter) - 26 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Phase Detection

    - 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. - 27 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Other Control

    Total capacity including sub units is displayed (2sec) Heat pump : Display 2 is default value Power type Model type - 28 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 Every indoor unit displays its address on wired remote controller and the 7 segment of main PCB is off. - 29 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 * Functions save in EEPROM will be kept continuously, though the system power was reset. * FDD function applies to ARUN***LTE4 only. - 30 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Emergency Operation

    Emergency operation with inverter compressor failure should not last 48 hours. ‘ It causes other compressor failure. During the emergency operation, cooling/heating capacity may be lower. - 31 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 8. First, please pressing the main PCB reset button for 3 minutes when you want to use all FDD functions. 9. Normal test run is operated when you use more than LGMV 7.0.3 version. - 32 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Refrigerant Auto Charging

    ( , ) Push Button E10 expression over 3 second Start refrigerant charging Refrigerant amount Reverse switching, indoor unit OFF - 33 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 4. If The Outdoor unit occurred frost when Heating automatic refrigerant filling, Please restart corresponding function after forced defrost. - 34 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Refrigerant Amount Automatic Judgment

    • although 15minutes have not elapsed during full room operation indoor unit, amount of refrigerant is judged directly in spe- cial case. • Press SW04C(X: Cancel) button and down dip switch after function end. - 35 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: Itr(Cooling)

    ITR(Cooling) More than standard ex) 20% Less than standard ex) -15% Refrigerant Don't Adjustment required Impossible to Judge 3-CF - 36 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Itr(Heating)

    1 IDU operation and save data Switchover 4way valve Judge IDU EEV Stop operation and judge the result System off - 37 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 ODU : -10 ~ 24 °C In case the function is not used, set the dip S/W OFF and reset the power. - 38 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Fdd Code

    Wait a system-off for operate FDD function. Need additional refrigerant sealed. Same as normal System error Occur system error. operation - 39 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: Multi V Itr Result Report

    ODU #1 ODU #2 ODU LEV Openness ODU #3 ODU #4 Refrigerant Check Main EEV Check IDU EEV Check - 40 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Pump Down

    2. Make certain that IDU 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) - 41 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Pump Out

    Make certain that IDU doesn't run with thermo off mode during operation (in case low pressure doesn't go down) - 42 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 Replace compressor and perform vacuum. 6. Add the refrigerant with auto charging function Service Port Liquid pipe Gas Pipe Refrigerant charging valve - 43 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: Auto Back Up Function_Inverter Compressor

    3. If Inverter Comp Auto Back up starts, error displays for 10 min. every 6 hours. 4. Error displays continuously at the corresponding ODU. - 44 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Night Low Noise Function

    • In case the function is not used, set the dip S/W OFF and reset the power. • If ODU RPM changes, cooling capacity may go down. - 45 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Vacuum Mode

    Max. RPM Start the Static pressure compensation mode : Step2 1050 Save the selected option value in EEPROM Step3 1130 - 46 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Cool & Heat Selector

    • If do not use a function, set an off-mode. • If use a function, first install a Cool & Heat selector. - 47 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 1 PLS5 1350 op24 vi eev 2 PLS6 op25 IDU running capacity IDU1 op26 Total number of IDU IDU2 - 48 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: Part 3 Pcb Setting And Test Run

    Part 3 PCB Setting and Test Run - 49 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 • In case that the outdoor temperature is low, be sure to supply power 4 hours before operation so that the heater is heated(insufficient heating may cause damage of the compressor.) - 50 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 • When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 51 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 7 - Segment SW04C (X : cancel) SW03C ( : forward) SW02C ( : backward) SW01C ( : confirm) SW01D (reset) - 52 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 • Master Unit • Slave Unit Dip switch setting Dip switch setting ODU Setting Slave 1 Slave 2 Slave 3 - 53 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 54: Part 4 Trouble Shooting Guide

    Part 5 Trouble shooting guide - 54 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 2.9 Outdoor Fan .....................65 2.10 Solenoid Valve ..................66 2.11 Reverse Valve..................67 2.12 Temperature Sensor ................67 2.13 Others .....................68 3. Self-diagnosis function ..............69 - 55 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 56: The Phenomena From Main Component Failure

    • When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 56 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 57: Checking Method For Key Components

    (when measuring absolute values). Accurate measuring values cannot be obtained with a gen- eral movable tester (For analog and digital mode). - 57 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 58: Fan Motor

    3. If problems continue to occur even after counter- measure of No.1 and No.2, it means that both boards has defect. - 58 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 59: Electronic Expansion Valve

    Full open EEV noise. open 1950 pulses - If liquid refrigerant is in EEV, the noise is lower. pulse - 59 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 - When the coil part is removed or assembled, be careful not to bend the pipe of the body. Body Body - 60 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 If estimated temperature is very low in comparison with suction temperature which is displayed at remote controller then the valve is not fully closed - 61 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 62: Phase Bridge Diode Checking Method

    Otherwise, there is chance of getting electric shock. • There is chance of electric shock by charged voltage. - 62 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 63: Inverter Ipm Checking Method

    3.0K Ω ± 10%(25℃) 2.3K Ω ± 10%(25℃) ] Red(+) and black(-) are the measuring terminals of multi tester. - 63 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 64: Fan Ipm Checking Method(Ux3 Chassis)

    U Terminal U Terminal W Terminal U,V,W Connector U,V,W Connector N Terminal DC Link Connector N Terminal UX3 Fan PCB - 64 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 65: Fan Ipm Checking Method(Ux2 Chassis)

    ] Red(+) and black(-) are the measuring terminals of multi tester. U terminal V terminal W terminal N terminal P terminal U.V.W connector DC connector UX2 Fan PCB - 65 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 66: Pressure Sensor(High/Low Pressure Sensor)

    This does not mean breakdown of the unit, the fan will start operating if it reaches the set point. - 66 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 67: Solenoid Valve

    5. Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it with DC mega tester(DC 500V). - 67 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 68: Reverse Valve

    2. Check whether the connector contact of temperature sensor is normal. 3. Measure the resistance of temperature sensor. 10KΩ±1%(25℃) 5KΩ±1%(25℃) 200KΩ±1%(25℃) Resistance 1.07KΩ±3.3%(85℃) 535KΩ±3.3%(85℃) 28KΩ±7.7%(85℃) - 68 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 69: Others

    3) Set the multi meter to resistance mode, confirm that the resistance value of the resistor is around 270 kOhm Check and replace inferior components - 69 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 70: Self-Diagnosis Function

    Slave2 Outdoor Unit Inverter Board Input Over Current(RMS) of Slave3 Outdoor Unit Inverter Board Input Current excess (RMS) Slave3 Outdoor Unit - 70 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 Compressor Over Current Drive Fault Slave2 Outdoor Unit Inverter Slave3 Outdoor Unit Inverter Compressor Fault OR Compressor Over Current Drive Fault - 71 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 3 minutes Slave3 Outdoor Unit Low Slave3 Outdoor Unit stayed under low Compression Compression Ratio Limited limit for 3 minutes - 72 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 Sensor Fault or short Slave3 Outdoor Unit Air Temperature Slave3 Outdoor Unit Air Temperature Sensor open Sensor Fault or short - 73 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 Slave2 Outdoor Unit Omitting connection of R, S, T power Omitting connection of Slave3 Outdoor Unit of Slave3 Outdoor Unit - 74 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 Slave3 Outdoor Unit Inverter System is turned off by Slave3 Outdoor Unit Inverter Heatsink High Temperature Heatsink High Temperature - 75 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 High Voltage Error Slave3 Outdoor Unit Fan DC Link Slave3 Outdoor Unit Fan DC Link High Voltage Error High Voltage Error - 76 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 Slave3 Outdoor Unit Fan PCB EEP- Communication Fail Between Slave3 Outdoor Unit ROM Error Fan MICOM and EEPROM or omitting EEPROM - 77 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 Slave3 Outdoor Unit Liquid pipe Liquid pipe temperature sensor of slave3 Outdoor Unit is open Temperature Sensor Error or short - 78 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 Pressure unbalance between Outdoor Units Slave2 Outdoor Unit Failure of operation mode conversion at Pressure unbalance between Outdoor Units Slave3 Outdoor Unit - 79 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 Slave3 Outdoor Unit Fan Heatsink Slave3 Outdoor Unit Fan Heatsink Temperature Sensor open Temperature Sensor Fault or short - 80 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 CN-PIPE IN : Pipe inlet temp sensor CN-PIPE OUT : Pipe outlet temp sensor Measure the resistance of outlet pipe temp sensor. - 81 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 ❇ The PCB can differ from model to model. Check from the right source. Checking communication cable connection status - 82 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 * If the float goes up higher than a half of float switch then the circuit is open & the unit is stopped automatically. (High position Open) float Condensate water - 83 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 (Check input of 220V) (Marked as CN-DPUMP) Float switch Housing (CN-FLOAT) [***] Standard of drain pipe head height / slope MAX 450 - 84 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 (-9V~+9V) then of communication terminal between IDU and ODU communication from outdoor unit is normal - 85 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 - Replace the indoor unit PCB, and then make sure to perform Auto addressing and input the address of central control - 86 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 (Notice: The connection of motor connector to PCB should be done under no power supplying to PCB) - 87 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 88 Check Comp PCB assembly IPM normality. Is Comp PCB assembly → Replace Comp PCB assembly normal? if abnormality found. Recheck power and installation condition - 88 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 89 * Compressor wire connector connection each terminal of compressor point * IPM joining point Check joining conditon Check DC_Link Connector joining condition - 89 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 Check Comp PCB assembly IPM normality Is Comp PCB assembly → Replace Comp PCB assembly normal? Recheck power and installation condition - 90 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 * Measuring input voltage each terminal of compressor * Compressor wire connector connection * Check DC_Link Connector joining condition - 91 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 Check Comp PCB assembly IPM normality. Is Comp PCB assembly → Replace Comp PCB assembly if abnormality found. normal? Recheck power and installation condition - 92 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 93 Troubleshooting Guide * Check DC_Link Connector joining condition N terminal P terminal DC_Link Connector * Measuring input voltage - 93 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 94 LGMV similar as Replace high pressure sensor at manifold gauge? Check pipe is blocked or not and take measure - 94 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 95 → Reassemble if abnormality found Replace Comp PCB assembly. Comp PCB LED display error Recheck power and installation condition - 95 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 96 Check Comp PCB assembly IPM normality Is Comp PCB assembly normal? → Replace Comp PCB assembly Recheck power and installation condition - 96 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 97 Troubleshooting Guide * Measuring resistance between each terminal of compressor * Compressor wire connection - 97 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 98 Is Comp PCB assembly normal? Replace Comp PCB assembly Recheck power and installation condition * Measuring input voltage * Noise filter wiring - 98 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 99 Check Comp PCB assembly IPM normality Is Comp PCB assembly normal? → Replace Comp PCB assembly Recheck power and installation condition - 99 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 100 Troubleshooting Guide * Measuring resistance between each terminal of compressor * Measuring input voltage * Compressor wire connection - 100 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 101 Check another components Is there pipe and operation conditions (strainer etc.) clogging? / Take measures Replace strainer - 101 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 102 Replace sensor of high pressure value(Is it high actually)? Check indoor unit LEV Check indoor unit PCB Check in/outdoor installation condition - 102 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 103 (Notice: it is not full ice forming of strainer, in case that there is installation conditions not at inlet portion but at outlet portion) - 103 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 104 Replace Comp PCB assembly Is Comp PCB assembly normal? Recheck power and installation condition * Measuring input voltage * Comp PCB assembly - 104 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 105 10C = 362k : 25C= 200k : 50C= 82k : 100C= 18.5k Check the resistance inverter compressor discharge temperature sensor - 105 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 106 PCB correctly? After replacement of Replace corresponding outdoor unit main PCB pressure sensor is the system normal? Pressure sensor connector - 106 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 107 2. Temperature Sensor(Open/Short) Slave1 1542 Temperature Sensor Temperature Sensor 3. Main PCB Fault Slave2 1543 Fault open or short Slave3 1544 - 107 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 108 * Measuring input voltage * Noise filter wiring * Field Fault Case R S T * R-Phase Terminal Changed Color. - 108 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 109 * In order to check communication cables between outdoor units, ➠ ➠ check in order as below : PCB connectors terminal block communication cables - 109 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 110 Communication Connector & LED in Comp1 PCB Comp1 Communication Comp2 Communication Connector Connector Communication Connector & LED in Comp2 PCB - 110 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 111 In case that only communication PCB is replaced above process is not needed - 111 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 112 ❈ Remark : IDU A/IDU B Indoor Unit Communication PCB Wiring Fault Case 1 time/10 sec Turn on/off ❈ - 112 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 113 Is there any error 1. Replace Main PCB when power reset? Recheck power and installation condition Main PCB C/Box Bottom Comp PCB - 113 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 114 Is there any error when 1. Replace Main PCB power reset? Recheck installation condition * Dip Switch Setting Slave1 Slave2 Slave3 - 114 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 115 * Inverter EEPROM inserting point Check IC02L * Right inserting direction of inverter EEPROM ❊ Note : Replace after power off - 115 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 116 Normal? Replace Inverter PCB Assembly Recheck Power and Installation Condition n Check Inverter PCB Screw Connection Condition Check Screw - 116 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 117 Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ - 117 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 118 Recheck power and installation condition * Fan Motor resistance measuring between each phase * Fan left(1) * Fan right(2) - 118 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 119 1. Replace Converter PCB Assembly normal? Recheck Power and Installation Condition * Measuring input voltage * Converter PCB assembly - 119 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 120 Recheck Power and Installation Condition 15V Input power wiring conditions Check short of power wire 15V Input power on Inverter PCB - 120 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 121 Is Fan PCB normal? 1. Replace Fan PCB DC Link Voltage Connecting Part Recheck power and installation condition Noise filter wiring - 121 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 122 → Replace Fan PCB assembly Recheck power and installation condition Measuring fan motor phase resistance Fan left(1) Fan right(2) - 122 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 123 Measuring fan motor Measuring insulation resistance phase resistance between fan terminal & chassis Check Point Fan motor wire connection - 123 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 124 EEPROM Insertion EEPROM Main PCB * Note : Replace after power off Same direction both socket hole and EEPROM hole - 124 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 125 Inverter EEPROM insertion direction Same direction both socket hole and EEPROM hole ❈ Note : Replace after power off - 125 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 126 Is Slave Unit Dip SW Dip SW setting setting done? Is Main PCB power Connect power cable supplied? Replace Main PCB - 126 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 127 Is fan PCB assembly normal? Recheck power and installation condition Replace inverter PCB assembly Comp Fan Communication Connection Communication Connecter Communication LED - 127 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 128 Replace fan PCB assembly Is fan PCB assembly normal? Recheck power and installation condition Fan Motor Wire connection Fan left(1) Fan right(2) - 128 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 129 Is Fan PCB assembly normal? Replace fan PCB assembly Recheck power and installation condition DC voltage connection DC Volt connected - 129 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 130 Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ - 130 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 131 External Communication LED External Communication Connector Communication Connector & Communication Connector & LED in Main PCB LED in External PCB - 131 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 132 If the same error is occurred in mode, is the same error near future replace 4way valve occurred again? Replace 4 way valve***** - 132 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 133 √ If there is a unit in which the difference is not increased then the 4way valve of that unit is defective - 133 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 134 ’ Press the Rest Button Replay Replace External PCB On-boarding Reset Button Communication LED Between Main and Sub Micom - 134 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 135 Replace Fan PCB Assembly Recheck Power and Installation Condition n Check Fan PCB Screw Connection Condition Check Screw Connection Condition - 135 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 136 Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ - 136 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 137 1. Set the slave mode with Simple central controller after reset. controller setting normal? Recheck power and installation condition <RS-485 communication wire miss connection> - 137 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 138 April, 2013 P/NO : MFL67369002...

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