LG MULTI V M ARNU07GTU 4 Series Svc Manual
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LG MULTI V M ARNU07GTU 4 Series Svc Manual

LG MULTI V M ARNU07GTU 4 Series Svc Manual

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CONFIDENTIAL
Air Conditioner
SVC MANUAL(R410A)
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

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Summary of Contents for LG MULTI V M ARNU07GTU 4 Series

  • Page 1 CONFIDENTIAL Air Conditioner SVC MANUAL(R410A) CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel. Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 2: Table Of Contents

    External Appearance ........................9 Nomenclature ..........................11 Part 2 MULTI V M ......................12 Part 3 PCB Setting and Test Run ................32 Part 4 Trouble shooting guide................37 - 2 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Safety Precautions

    • Prepare for strong wind or earthquake and install the unit at the specified place. - Improper installation may cause the unit to topple and result in injury. - 3 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 4 • Do not open the inlet grille of the product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.) - There is risk of physical injury, electric shock, or product failure. - 4 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 • Be sure the installation area does not deteriorate with age. - If the base collapses, the air conditioner could fall with it, causing property damage, product failure, or personal injury. - 5 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 • Do not insert hands or other objects through the air inlet or outlet while the air conditioner is powered - There are sharp and moving parts that could cause personal injury. - 6 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Part 1 General Information

    2. External Appearance ............9 2.1 Indoor Unit ...............9 2.2 MULTI V M ..............10 3. Nomenclature..............11 3.1 Indoor Unit .............11 3.2 MULTI V M ..............11 - 7 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 8: Model Names

    *Wall Mounted- A: Basic, L:Plasma, *Ceiling Cassette- A: Basic, C:Plasma 1.2 MULTI V M Power Supply 380-415 V 3N~ 50 Hz ARUN050LMC0 220-240 V~ 50 Hz ARUN050GME0 - 8 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 9: External Appearance

    ARNU09GQAA4 ARNU36GV2A4 ARNU12GQAA4 ARNU48GV2A4 ARNU15GQAA4 h In matters of combination with MULTI V M system, refer the PDB of that MULTI V M. - 9 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 10: Multi V M

    External Appearance 2.2 MULTI V M Chassis Model Name External Appearance ARNU050LMC0 ARNU050GME0 - 10 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 11: Nomenclature

    C : Compressor Module E : Heat Exchanger Module Serial number • Additional information : Serial number is refer to the bar code on the product. - 11 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 12: Part 2 Multi V M

    Part 2 MULTI V M - 12 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 ARU* Series • Function ..................14 - 13 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 4.4 Vacuum Mode ......................28 4.5 Static pressure compensation mode................28 4.6 Cool & Heat selector ....................29 4.7 Cycle Data View......................30 4.8 Refrigerant noise reduction mode................31 - 14 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 15: Basic Control

    Inverter Inverter Compressor Compressor Compressor Min. frequency Stop(0Hz) Cooling and heating load Fuzzy Control Inverter linear control as cooling and heating load increasing - 15 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 16: Master And Slave Unit's Eev Control

    (3) Avoiding excessive high discharge temperature : when main EEV opens some given opening and dis- charge temperature is above 85°C in heating operation, subcooling EEV may control the "subcooling out temperature-evaporating temperature" to be some given difference. - 16 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 17: Special Control

    Oil return operation time : 3 min for running step n Starting condition : Every 8 hours operate n Oil return process ends if compressor protection control starts - 17 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 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 - 18 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 19: Defrost Control

    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. - 19 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 20: Stop Operation

    Note Inverter compressor Stop Main EEV Min. pulse Subcooling EEV Min. pulse 1 hour after stop & outdoor temp. > 30˚C 4way valve - 20 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 21: Protection Control

    +2Hz or less/10 s +100RPM/10 s Ps ≥ 190 kPa Normal control h Frequency holding : frequency (or RPM) is not increasing ( can decrease ). - 21 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 22: Discharge Temperature Control

    - 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. - 22 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 23: Other Control

    Heat pump : Display 2 is default value Power type Model type h AC input current is input current of inverter compressor except constant current (current pass through noise filter) - 23 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 Auto address process is finished. Every indoor unit displays its address on wired remote controller and the 7 segment of main PCB is off. - 24 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 Change the save in reduction mode set value EEPROM * Functions save in EEPROM will be kept continuously, though the system power was reset. - 25 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 26: 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) - 26 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 27: Night Low Noise Function

    • In case the function is not used, set the dip S/W OFF and reset the power. • If ODU Hz and RPM change, cooling capacity may go down. - 27 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 28: Vacuum Mode

    Button : : “op1~op2” ‘ ’, ‘ ’ Push the button ‘●’ Start the Static pressure compensation mode : Save the selected option value in EEPROM - 28 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 29: Cool & Heat Selector

    • Ask an authorized technician to setting a function. • If do not use a function, set an off-mode. • If use a function, first install a Cool & Heat selector. - 29 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 30: Cycle Data View

    Main EEV PLS1 1950 pls SC EEV PLS3 16 pls IDU running capacity IDU1 24 kBTU Total number of IDU IDU2 10 EA - 30 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 31: Refrigerant Noise Reduction Mode

    Start the refrigerant noise reduction mode : On Normal mode (Fast cooling & Fast heating) : Off Save the selected option value in EEROM - 31 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 32: Part 3 Pcb Setting And Test Run

    Part 3 PCB Setting and Test Run - 32 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 33 • Start preheat operation for 4 hours after supplying main power. • In case that the outdoor temperature is low, be sure to supply power 4 hours before operation so - 33 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 34 • When CH05/53 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 34 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 Display PCB 7 - Segment SW01D (reset) SW04C (X : cancel) DIP-SW01 SW03C ( : forward) SW02C ( : backward) SW01C ( : confirm) - 35 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 36 • Initial display order Order Note ① Model capacity Cooling only ② Heat pump 380V ③ 460V 220V Standard ④ Cold temperature area Tropical - 36 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 37: Part 4 Trouble Shooting Guide

    Part 4 Trouble shooting guide - 37 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 38 2.5 Inverter IPM Checking Method ..............46 2.6 Pressure Sensor(High/Low Pressure Sensor) ........47 2.7 Outdoor Fan .....................47 2.8 4 way Valve....................48 2.9 Temperature Sensor ................48 3. Self-diagnosis function ..............19 - 38 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 39: The Phenomena From Main Component Failure

    • When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 39 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 40: 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). - 40 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 41: Fan Motor

    2. Check contact of the connector. 3. Check that parts are firmly secured by tightening screws. 4. Check connection of polarity. 5. Check short circuit and grounding. - 41 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 42: Electronic Expansion Valve

    EEV surface with a screw driver and listening the Full open EEV noise. open 1950 pulses - If liquid refrigerant is in EEV, the noise is lower. pulse - 42 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 43 - When the coil part is removed or assembled, be careful not to bend the pipe of the body. Body Body - 43 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 44 If estimated temperature is very low in comparison with suction temperature which is displayed at remote controller then the valve is not fully closed - 44 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 45: Phase Bridge Diode Checking Method

    • 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. • There is chance of electric shock by charged voltage. - 45 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 46: Inverter Ipm Checking Method

    U terminal : black(-) 0.2V~0.6V V terminal : black(-) 0.2V~0.6V W terminal : black(-) 0.2V~0.6V ] Red(+) and black(-) are the measuring terminals of multi tester. - 46 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 47: 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. - 47 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 48: Way Valve

    2. Check whether the connector contact of temperature sensor is normal. 3. Measure the resistance of temperature sensor. 3) Pipe temperature sensor : TH3 10kΩ±1%(25°C) 200kΩ±1%(25°C) 5kΩ±1%(25°C) Resistance 1.07kΩ±3.3%(85°C) 28kΩ±7.7%(85°C) 535Ω±3.3%(85°C) - 48 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 49 Compressor Module Inverter Compressor Compressor Module Inverter Compressor Fault OR Drive Over Current Fault ※ Refer to the Indoor manual for some Indoor Error code. - 49 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 50 Converter CT Sensor Error of Compressor Module Compressor Module Compressor Module Main PCB EEPROM Communication Fail Between Compressor Module Main Error MICOM and EEPROM or omitting EEPROM - 50 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 51 Superheat not satisfied 5 Min. Failure of operation mode con- Failure of operation mode conversion at 1 5 1 version at Compressor Module Compressor Module - 51 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 52 CN-ROOM : Indoor air temp sensor CN-PIPE IN : Pipe inlet temp sensor CN-PIPE OUT : Pipe outlet temp sensor Measure the resistance of outlet pipe temp sensor. - 52 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 53 CN-REMO : Remote controller connection ❇ The PCB can differ from model to model. Check from the right source. Checking communication cable connection status - 53 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 54 * 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 - 54 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 55 A:Point to check rotating (Check input of 220V) (Marked as CN-DPUMP) Float switch Housing (CN-FLOAT) [***] Standard of drain pipe head height / slope MAX 450 - 55 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 56 ~ +9V) exists when checking DC voltage of indoor unit is fluctuate within (-9V~+9V) then of communication terminal between IDU and ODU communication from outdoor unit is normal - 56 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 57 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 - 57 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 58 ** 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) - 58 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 59 → Reassemble if abnormality found Check Inv. PCB IPM normality. Is Inv. PCB → Replace Comp PCB assembly normal? if abnormality found. Recheck power and installation condition - 59 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 60 → Check connection condition and wiring if power is abnormal Check Inv. PCB IPM normality Is Inv. PCB → Replace Inv. PCB normal? Recheck power and installation condition - 60 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 61 Check Inv. PCB IPM normality. Is Inv. PCB → Replace Inv. PCB if abnormality found. normal? Recheck power and installation condition - 61 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 62 Is high pressure of LGMV similar as Replace high pressure sensor at manifold gauge? Check pipe is blocked or not and take measure - 62 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 63 3. Check wire disconnection and wiring → Reassemble if abnormality found Replace Inv. PCB Inv. PCB LED display error Recheck power and installation condition - 63 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 64 → Reassemble if abnormality found Check Inv. PCB IPM normality Is Inv. PCB normal? → Replace Inv. PCB Recheck power and installation condition - 64 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 65 Replace Inv. PCB normal? Is Inv. PCB normal? Replace Inv. PCB Recheck power and installation condition * Measuring input voltage * Noise filter wiring - 65 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 66 → Check connection condition and wiring if power is abnormal Check Inv. PCB IPM normality Is Inv. PCB normal? → Replace Inv. PCB Recheck power and installation condition - 66 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 67 Check liquid injection corresponded corresponded operate normally? Check another components Is there pipe and operation conditions (strainer etc.) clogging? / Take measures Replace strainer - 67 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 68 Manifold Replace sensor of high pressure value(Is it high actually)? Check indoor unit LEV Check indoor unit PCB Check in/outdoor installation condition - 68 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 69 (Notice: it is not full ice forming of strainer, in case that there is installation conditions not at inlet portion but at outlet portion) - 69 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 70 Replace Inv. PCB assembly Is Inv. PCB assembly normal? Recheck power and installation condition * Measuring input voltage * Inv. PCB assembly - 70 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 71 Note: Standard values of resistance of sensors at different temperatures (5% variation) 10C = 362k : 25C= 200k : 50C= 82k : 100C= 18.5k Check the resistance inverter compressor discharge temperature sensor - 71 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 72 Connect sensor to PCB correctly to PCB correctly? After replacement of Replace corresponding Compressor Module main PCB pressure sensor is the system normal? Pressure sensor connector - 72 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 73 : 25°C= 10kΩ : 50°C= 3.4kΩ PCB of compressor module. Sensor of piping temperature: 10°C = 10kΩ : 25°C= 5Ωk : 50°C= 1.8kΩ - 73 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 74 Replace Inv. PCB assembly. Recheck power and installation condition * Measuring input voltage * Noise filter wiring * Field Fault Case * R-Phase Terminal Changed Color. - 74 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 75 130% of Compressor module same as the data of LGMV? Compressor module capacity at LGMV? Adjust the capacity of indoor and Compressor module - 75 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 76 Replace Inv. PCB * The method of checking Main PCB and Inv. PCB (If normal, communication LED blinks) Inverter Communication LED Inverter Communication Connector - 76 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 77 * After replacement of indoor 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 communication PCB is replaced above process is not needed - 77 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 78 Troubleshooting Guide Communication Part in Main PCB ❈ Remark : IDU A/IDU B Wiring Fault Case - 78 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 79 Is there any error 1. Replace Main PCB when power reset? Recheck power and installation condition Main PCB Inv. PCB Communication wire - 79 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 80 Recheck power and installation condition * Inv. EEPROM inserting point * Right inserting direction of Inv. EEPROM ❊ Note : Replace after power off - 80 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 81 1. Reset Normal? Replace Inv. PCB Assembly Recheck Power and Installation Condition n Check Inv. PCB Screw Connection Condition Check Screw Connection Condition - 81 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 82 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 - 82 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 83 Replace Heat Exchanger Module Sub PCB assembly Is Inv. PCB assembly normal? Recheck power and installation condition * Sub PCB - 83 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 84 Check connection condition and wiring if power is abnormal Is Inv. PCB 1. Replace Inv. PCB Assembly normal? Recheck Power and Installation Condition * Measuring input voltage * Inv. PCB assembly - 84 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 85 Recheck power and installation condition EEPROM Insertion EEPROM Main PCB * Note : Replace after power off Same direction both socket hole and EEPROM hole - 85 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 86 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 - 86 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 87 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 - 87 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 88 : Both Pipe in, pipe out temp. is under 10℃ R(L1) S(L2) T(L3) during unit is off(EEV 40pls) Also, big refrigerant flow noise occured - 88 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 89 If the same error is occurred in mode, is the same error near future replace 4way valve occurred again? Replace 4 way valve***** - 89 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 90 Main PCB(marked as 4way,CN09) ** Confirm the 4way valve coil is inserted to the end **** Check the output voltage of terminal socket during heating operation - 90 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 91 P/NO : MFL42395744 Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

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