LG MULTI V Service Manual
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LG MULTI V Service Manual

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Table of Contents

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Air Conditioner
SERVICE MANUAL (R410A)
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication,
modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained
the prior written consent of the LG Electronics entity from which you received this Service Manual. The material
covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.
Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
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Summary of Contents for LG MULTI V

  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.

  • Page 2: Table Of Contents

    Part 2 Outdoor Units ....................15 Part 3 HR Units ......................36 Part 4 PCB Setting and Test Run ................54 Part 5 Trouble shooting guide................87 - 2 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Safety Precautions

    Service Center. • There is risk of fire, electric shock, explosion, or • There is risk of fire, electric shock, explosion, or injury. injury. - 3 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only 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 © 2020 LG Electronics Inc. All rights reserved. Only 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 © 2020 LG Electronics Inc. All rights reserved. Only 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 © 2020 LG Electronics Inc. All rights reserved. Only 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 © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 8: Part 1 General Information

    2. External Appearance .............11 2.1 Indoor Unit .............11 2.2 Outdoor Unit ............12 3. Nomenclature..............13 3.1 Indoor Unit .............13 3.2 Outdoor Unit ............13 3.3 HR Unit ..............14 - 8 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 9: Model Names

    *Ceiling Concealed Duct - A : Basic, Z : FAU 1.2 Outdoor Unit Power Supply 3TON 4TON 1 Ø, 208/230 V, 60 Hz ARUM036GSS5 ARUM048GSS5 - 9 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 6 branches 8 branches 1Ø, 220-240 V, 50 Hz / 1Ø, 220 V, 60 Hz PRHR063 PRHR083 1Ø, 208/230 V, 60 Hz PRHR063A PRHR083A - 10 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 11: External Appearance

    ARNU093VEA2 ARNU183CFU4 ARNU123VEA2 ARNU243CFU4 Ceiling Suspended Vertical AHU URNU183VJA2 URNU243VJA2 ARNU123NJA4 ARNU183NJA4 Ceiling Cassette -2Way ARNU243NJA4 ARNU303NJA4 ARNU183TSA4 ARNU363NJA4 ARNU243TSA4 ARNU423NKA4 ARNU483NKA4 ARNU543NKA4 - 11 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 External Appearance 2.2 Outdoor Unit CHASSIS Model Name External Appearance ARUM048GSS5 ARUM036GSS5 - 12 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 13: Nomenclature

    V : Inverter and C/O B : Inverter and H/R M : for both H/P and H/R System with Outdoor Unit using R410A - 13 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 08 : For 8 branches Indicates that this is System HR Unit using the R410A ※ These are model names of the basic function. - 14 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 15: Part 2 Outdoor Units

    Part 2 Outdoor Units - 15 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 ARU* Series • Function ..................17 - 16 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 4.6 Cycle Data View......................32 4.7 Refrigerant noise reduction mode................33 4.8 Snow removal & rapid defrost..................34 4.9 Cool & Heat Selector (Only Heatpump) ..............35 - 17 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 18: 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 - 18 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 19: Eev Control

    85 ℃(185 ℉) in heating operation, subcooling EEV may control the "sub- cooling out temperature-evaporating temperature" to be some given difference. - 19 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 20: 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 - 20 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only 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 © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 22: Defrost

    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 © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 23: Stop Operation

    0 Hz Stop Main EEV Min. pulse Subcooling EEV Min. pulse 4way valve 1 OFF over 30 °C[86 °F] air temperature 4way valve 2 - 23 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 24: Protection Control

    +100 RPM / 10 seconds Ps > 220 kPa (31.9 psi) Normal control h Frequency holding : frequency (or RPM) is not increasing (can decrease). - 24 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 25: Discharge Temperature Control

    - The state of pressure sensing switch is normally on. It has small electric current from 220 V AC. Never touch the connecting terminal with hand nor short two wires directly. - 25 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 26: Other Control

    (2 seconds) Heat Pump : Display 2 is default value Heat Recovery : Display 3 is default value Power type Model type - 26 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 Auto address process is finished. Every indoor unit displays its address on wired remote controller and the 7 segment of main PCB is off. - 27 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 EEPROM * Functions save in EEPROM will be kept continuously, though the system power was reset. - 28 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 29: 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) - 29 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 30: 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. - 30 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 31: Vacuum Mode

    Button : : “op1~op3” ‘ ’, ‘ ’ Push the button ‘●’ Start the Static pressure compensation mode : Save the selected option value in EEPROM - 31 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 32: 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 - 32 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 33: Refrigerant Noise Reduction Mode

    Powerful Refrigerant noise reduction Mode Mild Refrigerant noise reduction Mode CAUTION • Ask an authorized technician to setting a function. • Change a power consumption or efficiency. - 33 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 34: Snow Removal & Rapid Defrost

    • Ask an authorized technician to setting a function. • If do not use a function, set an off-mode. • For cold and humid areas, set the rapid defrost. - 34 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 35: Cool & Heat Selector (Only Heatpump)

    • 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. - 35 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 36: Part 3 Hr Units

    Part 3 HR Units - 36 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 37 HR Units 1. Specifications ........................38 2. Parts Functions ......................40 3. Dimensions ........................42 4. Piping Diagrams ......................45 5. Wiring Diagrams ......................47 6. Functions ........................52 - 37 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 38: Specifications

    Polyethylene Foam 1 Ø, 220-240 V, 50 Hz / 1 Ø, 220 V, 60 Hz Power Supply 1 Ø, 208/230 V, 60 Hz - 38 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 39 MFA ≤ 4 * FLA (Next lower standard fuse rating. Min. 15 A) 4. Select wire size based on the MCA 5. Instead of fuse, use circuit. - 39 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 40: Parts Functions

    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 - 40 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 41 Low pressure gas pipe Subcooling EEV Liquid bypass valve Balancing valve Gas pipe Liquid pipe (to Indoor unit) Solenoid assembly 1 Solenoid assembly 2 - 41 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 42: Dimensions

    Dimensions Dimensions 1. HR Units - 42 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 43 Dimensions - 43 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 44 Dimensions - 44 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 45: Piping Diagrams

    Ⓒ : 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 - 45 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 46 Ⓒ : 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 - 46 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 47: Wiring Diagrams

    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 Setting, HR unit number - 47 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 48 Setting, EEV Number of Zoning(When Manual Address) SW01D Setting, EEV Group SW01B Setting, the Address of indoor_1(When Manual Address) SW02B Setting, the Address of indoor_10(When Manual Address) - 48 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 49 * This Function can be optional or factory installed depending on the application model. * You must purchase the optional parts in order to use them. - 49 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 50 * This Function can be optional or factory installed depending on the application model. * You must purchase the optional parts in order to use them. - 50 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 51 * This Function can be optional or factory installed depending on the application model. * You must purchase the optional parts in order to use them. - 51 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 52: Functions

    0 < timer < 5 Keep Close Close Stop or ventilation Heating mode : Low pressure gas valve Timer = 0 Keep Close ➔ Close - 52 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 53 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 - 53 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 54: Part 4 Pcb Setting And Test Run

    Part 4 PCB Setting and Test Run - 54 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 55 1. Checks Before Test Run..................83 2. How to Cope with Test Run Abnormality .............84 3. Dip Switch Setting....................85 4. Checking the setting of outdoor units ..............86 - 55 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 56: Unit Pcb (Prhr**2A, ** : 04, 03, 02)

    DIP S/W setting Normal control SW01M Turn the dip switch of the zoning branch on. Zoning Ex) Branch 1,2 are zoning control. control SW01M - 56 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 57 • If you want to use a PRHR042(A) for 2 branches HR unit after closing the 3rd and 4th pipes, set the dip switch for 2 branches HR unit. • The unused port must be closed with a copper cap, not with a plastic cap. - 57 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 58 (1/2) I.D15.88(5/8) (3-9/32) I.D12.7(1/2) ARBLB03321 I.D12.7(1/2) I.D9.52(3/8) 390(15-11/32) I.D6.35(1/4) (2-29/32) 413(16-1/4) 321(12-5/8) I.D22.2(7/8) I.D22.2(7/8) 332(13-1/16) I.D28.58(1-1/8) O.D19.05(3/4) O.D25.4(1) O.D19.05(3/4) I.D25.4(1) 80(3-5/32) 70(2-3/4) 110(4-11/32) - 58 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 59 Manual addressing of valve #4 SW03M SW03M Increase in the digit of 10 of valve address SW04M Increase in the last digit of valve address SW04M - 59 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 60 Increase in the digit of 10 of valve address SW03M SW04M Increase in the last digit of valve address SW04M SW05M Manual addressing of zoning indoor units SW05M - 60 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 61: Automatic Addressing

    • Automatic Addressing is only possible on the master Unit. • Automatic Addressing has to be performed after 3 minutes to improve communica- tion. - 61 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 62: Flow Chart For Chart For Auto-Addressing Of Indoor And Hr Unit

    Display of 01, 02, ..., 15 means connection of 15 indoor units and Automatic addressing is completed normally. - 62 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 63 Button :“StA” Push the ‘ ’ button Incompletion of auto pipe detection 88' is displayed on 7-SEG of the outdoor unit main PCB - 63 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 64 Completion of manual pipe detection Make sure that reset the outdoor unit power when changing the central control unit Reset the power of outdoor unit PCB. - 64 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 65: Example Of Manual Valve Addressing(Non-Zoning Setting)

    - 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.) - 65 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 66: Example Of Manual Valve Addressing (Zoning Setting)

    - The valve that is not connected with any indoor unit should be addressed with any other number than used address num- bers of the valves connected with indoor units. (The valves does not work if the address numbers are same.) - 66 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 67: Example Of Checking Valve Address

    The connected HR unit number The auto addressing number of indoor unit (digit of 1) The auto addressing number of indoor unit (digit of 10) - 67 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 68 * Number from left in sequence for less-than-8 branch model. ** PRHR043 / PRHR043A / PRHR033 / PRHR033A / PRHR023 / PRHR023A : Master Only - 68 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 69: Switch For Setup Of Hr Unit

    EEPROM factory initialization (4,5,6) No.7 Use only in factory production (preset to "OFF") Zoning setting ("ON") No.8 Use only in factory production (preset to "OFF") - 69 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 70 Master Slave Switch No.5 Off Switch No.5 On NOTE Do not turn on any SW02E on Slave Main PCB except No.5. Slave Slave - 70 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 71 Ex) If you want to use a PRHR083 for 4 branches HR Unit after closing the 5~8th pipes, set the dip switch for 4 branches HR Unit. - 71 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 72 (2-29/32) 390(15-11/32) 444(17-15/32) 413(16-1/4) 321(12-5/8) O.D15.88(5/8) I.D12.7(1/2) I.D22.2(7/8) I.D22.2(7/8) I.D28.58(1-1/8) 332(13-1/16) I.D12.7(1/2) O.D15.88(5/8) I.D9.52(3/8) O.D19.05(3/4) O.D25.4(1) O.D19.05(3/4) I.D25.4(1) 70(2-3/4) 70(2-3/4) 80(3-5/32) 110(4-11/32) 110(4-11/32) - 72 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 73 - Prerequisite for Manual pipe detection : central control address of each indoor unit must be preset differently at its wired remote control. - 73 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 74 SW01E SW #2 On : Select Valve #6 Input the central control SW #2 Off : Finish Valve #6 address of Indoor unit - 74 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 75 SW01E SW #2 On : Select Valve #6 Input the central control SW #2 Off : Finish Valve #6 address of Indoor unit - 75 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 76: Automatic Addressing

    • Automatic Addressing is only possible on the master Unit. • Automatic Addressing has to be performed after 3 minutes to improve communica- tion. - 76 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 77: Flow Chart For Chart For Auto-Addressing Of Indoor And Hr Unit

    Display of 01, 02, ..., 15 means connection of 15 indoor units and Automatic addressing is completed normally. - 77 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 78 ※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. - 78 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 79 Completion of manual pipe detection Make sure that reset the outdoor unit power when changing the central control unit Reset the power of outdoor unit PCB. - 79 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 80: Example Of Manual Valve Addressing(Non-Zoning Setting)

    - 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.) - 80 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 81: Example Of Manual Valve Addressing(Zoning Setting)

    - 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.) - 81 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 82: Example Of Checking Valve Address

    • The zoning information and Master IDU information remove from EEPROM after Auto-addressing. • If there is installed the central control, it is impossible setting of Master IDU in zoning. - 82 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 83: Test Run

    Check and confirm that there are no error messages in the display of indoor units or remote controls and LED in outdoor units. CAUTION when cutting main power of the Multi V • Always apply main power of the outdoor unit during use of product (cooling season/heating season).

  • Page 84: How To Cope With Test Run Abnormality

    • When CH05/53 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 84 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 85: Dip Switch Setting

    Test Run 3. DIP Switch Setting n Location of setting Switch Service PCB 7-Segment SW01C(●:confirm) SW01D(reset) SW02C(◀:backward) SW04C(x:cancel) SW03C(▶:forward) DIP-SWITCH - 85 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 86: Checking The Setting Of Outdoor Units

    (If you turn on the DIP s/w No 4, you can make sure “HR” or “HP” display later.) - 86 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 87: Part 5 Trouble Shooting Guide

    Part 5 Trouble shooting guide - 87 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 88 2.6 Outdoor Fan .....................96 2.7 4 way Valve....................97 2.8 Temperature Sensor ................98 2.9 Fan lock and Fan IPM Check ..............98 3. Self-diagnosis function ...............100 - 88 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 89: The Phenomena From Main Component Failure

    • When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 89 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 90: 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). - 90 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 91: 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. - 91 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 92: 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 - 92 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 93 - When the coil part is removed or assembled, be careful not to bend the pipe of the body. Body Body - 93 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 94 Unit connection 2. After removing the connector on the control board and connected part Indoor or assembly check with tester. Unit - 94 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 95: Inverter Igbtm 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. - 95 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 96: 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. - 96 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 97: Way Valve

    6. Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it with DC mega tester(DC 500 V). - 97 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 98: Temperature Sensor

    4. Check the Motor. Refer to the below. ■ How to check the outdoor fan motor of BLDC Tester Normal resistance (±10%) 45 Ω 45 Ω 45 Ω - 98 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 99 4. Measure the voltages of U~Nu / V~Nv / W~Nw as shown in Fig. 2. 5. If the measurements are significantly different from the levels shown in the figures, the IPM is deemed to be damaged. - 99 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 100: Self-Diagnosis Function

    Temperature 4 High Pressure of Outdoor Unit High Pressure of Outdoor Unit 5 Low Pressure of Outdoor Unit Low Pressure of Outdoor Unit - 100 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 101 Converter CT Sensor Error of Outdoor Unit Communication Fail Between Outdoor Unit Main MICOM and 6 Outdoor Unit Main PCB EEPROM Error EEPROM or omitting EEPROM - 101 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 102 • To use open line 485 communication (9,600 bps communication), you need to use a product in which all of the indoor unit/HR unit/outdoor unit/accessory model can use (9,600 bps communication). - 102 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 103 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. - 103 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 104 CN-REMO : Remote controller connection ❇ The PCB can differ from model to model. Check from the right source. Checking communication cable connection status - 104 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 105 * 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 - 105 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 106 (Check input of 220 V) (Marked as CN-DPUMP) Float switch Housing (CN-FLOAT) [***] Standard of drain pipe head height / slope 1/50~1/100 MAX 450 MAX 700 mm - 106 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 107 (-9 V~+9 V) then of communication terminal between IDU and ODU communication from outdoor unit is normal - 107 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 108 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 - 108 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 109 ** 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) - 109 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 110 → 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 - 110 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 111 Self-diagnosis function * Measuring resistance between * Compressor wire connector connection each terminal of compressor point - 111 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 112 → 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 - 112 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 113 Self-diagnosis function * Measuring resistance between * Measuring input voltage each terminal of compressor * Compressor wire connector connection - 113 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 114 → wiring again if abnormality found Check inverter PCB assembly IPM normality Is inverter PCB assembly normal? → Replace inverter PCB assembly Recheck power and installation condition - 114 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 115 Is high pressure of LGMV similar as Replace high pressure sensor at manifold gauge? Check pipe is blocked or not and take measure - 115 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 116 3. Check wire disconnection and wiring → Reassemble if abnormality found Replace Inv. PCB Inv. PCB LED display error Recheck power and installation condition - 116 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 117 → Reassemble if abnormality found Check Inv. PCB IPM normality Is Inv. PCB normal? → Replace Inv. PCB Recheck power and installation condition - 117 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 118 Self-diagnosis function * Measuring resistance * Compressor wire connection between each terminal of compressor - 118 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 119 → 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 - 119 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 120 Self-diagnosis function * Measuring resistance between each * Measuring input voltage terminal of compressor * Compressor wire connection - 120 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 121 Check liquid injection corresponded corresponded operate normally? Check another components Is there pipe and operation conditions (strainer etc.) clogging? / Take measures Replace strainer - 121 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 122 Manifold Replace sensor of high pressure value(Is it high actually)? Check indoor unit LEV Check indoor unit PCB Check in/outdoor installation condition - 122 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 123 (Notice: it is not full ice forming of strainer, in case that there is installation conditions not at inlet portion but at outlet portion) - 123 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 124 → Check connection condition and wiring if power is abnormal Replace inverter PCB assembly Is inverter PCB assembly normal? Recheck power and installation condition * Measuring input voltage - 124 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 125 10 C = 362 k : 25 C= 200 k : 50 C= 82 k : 100 C= 18.5 k Check the resistance inverter compressor discharge temperature sensor - 125 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 126 Connect sensor to PCB correctly to PCB correctly? After replacement of Replace corresponding outdoor unit main PCB pressure sensor is the system normal? Pressure sensor connector - 126 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 127 : 25 °C= 10 kΩ : 50 °C= 3.4 kΩ Sensor of piping temperature: 10 °C = 10 kΩ : 25 °C= 5 kΩ : 50 °C= 1.8 kΩ - 127 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 128 130 % of outdoor unit same as the data of LGMV? units capacity at LGMV? Adjust the capacity of indoor and outdoor unit - 128 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 129 Replace Inv. PCB * The method of checking Main PCB and Inv. PCB (If normal, communication LED blinks) Inverter Communication Connector Inverter Communication LED - 129 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 130 * 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 - 130 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 131 Self-diagnosis function Indoor Unit Communication Part in Main PCB Communication PCB ❈ Remark : IDU A/IDU B Wiring Fault Case - 131 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 132 1. Replace Inv. PCB assembly normal? Is there any error 1. Replace Main PCB when power reset? Recheck power and installation condition Inv. PCB Main PCB - 132 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 133 Recheck power and installation condition * Inv. EEPROM inserting point * Right inserting direction of Inv. EEPROM j Note : Replace after power off - 133 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 134 1. Reset Normal? Replace Inv. PCB Assembly Recheck Power and Installation Condition n Check Inv. PCB Screw Connection Condition Check Screw Connection Condition - 134 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 135 Air temperature sensor: 10 °C = 20.7 kΩ : 25 °C = 10 kΩ : 50 °C= 3.4 kΩ Pipe temperature sensor: 10 °C = 10 kΩ : 25 °C = 5 kΩ : 50 °C= 1.8 kΩ - 135 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 136 → Reassemble if abnormality found Replace Inv. PCB assembly Is Inv. PCB assembly normal? Recheck power and installation condition * Inv. PCB Fan1 Fan2 - 136 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 137 Recheck power and installation condition EEPROM Insertion EEPROM Main PCB * Note : Replace after power off Same direction both socket hole and EEPROM hole - 137 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 138 Air temperature sensor: 10 °C = 20.7 kΩ : 25 °C = 10 kΩ : 50 °C= 3.4 kΩ Pipe temperature sensor: 10 °C = 10 kΩ : 25 °C = 5 kΩ : 50 °C= 1.8 kΩ - 138 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 139 : Both Pipe in, pipe out temp. is under 10 ℃ during unit is off(EEV 40 pls) Also, big refrigerant flow noise occured - 139 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 140 If the same error is occurred in mode, is the same error near future replace 4way valve occurred again? Replace 4 way valve***** - 140 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 141 3. Wrong setting of the HR unit’s rotary switch or dip switch unit 4. HR unit PCB defect HR: Heat Recovery - 141 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 142 • Defective temperature sensor Abnormal value of sensor Sub-cooling discharge 203C#HR (Open/Short) measurement(Open / Short) pipe temperature sensor error • Defective outdoor unit PCB - 142 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 143 2. Wrong setting of the HR unit rotary between the HR unit the HR unit and outdoor unit switch and dip switch and outdoor unit 3. Defective HR unit PCB - 143 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 144 - SW02E : Use only SW No.5 - SW01D/SW01C/ Valve - SW01E : Branch #5~8 SW02B/SW01B/SW02E (from SW No.1) - SW01E : Branch #1~4 - SW01C (from SW No.1) - 144 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 145 • The above error code is only occurred at the upgraded 485 communication (9600bps communication) • Refer to the installation manual of the outdoor unit for the address setting to HR unit rotary switch for HR units - 145 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 146 1) Check the wiring connection between EEPROM and Main PCB of HR Unit. 2) Replace Main PCB of HR Unit even after check No.1 process. - 146 - Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 147 P/NO : MFL69740701 Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

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