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LG Multi V Service Manual Download Page 27

- 27 -

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

2) Step 2 : Communication check

- If all model code is displayed in 7 segment communication between outdoor units is normal.
- If 104* is displayed in 7 segment, check communication wires between outdoor units and Dip switch setting.

3) Step 3 : PCB error check

- After 40 seconds, error check begins.

4) Step 4 : Auto addressing of indoor units

- Auto addressing begins when address(red) button in Main PCB is pressed for 6 seconds.
- During auto addressing, 7 segment on main PCB displays "88"
- After auto addressing, the number of indoor units is displayed in 7 segment for 30 seconds. The address of

each indoor unit is displayed on each wired remote controller.

Push address(red) button for 3 seconds

Auto address starts

Auto address is in progress (max. 15 min.)

The number of indoor units is displayed for 30 seconds

(12 indoor units found)

Auto address process is finished.
Every indoor unit displays its address on 
wired remote controller and the 7 segment of 
main PCB is off.

DIP-SWITCH

SW01D(reset)

SW04C(x:cancel)

7-Segment 

SW03C(

▶

:forward)

SW02C(

◀

:backward)

SW01C(●:confirm)

n

Service PCB

Function

Summary of Contents for Multi V

Page 1: ...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 SERVICE MANUAL R410A CAUTION Before Servicing the unit read the safety precautions in General SVC manua...

Page 2: ...ervice purposes Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions 3 Part 1 General Information 8 Model Names 9 External Appearance 11 Nomenclature 13 Part 2 Outdoor Units 15 Part 3 HR Units 36 Part 4 PCB Setting and Test Run 54 Part 5 Trouble shooting guide 87 ...

Page 3: ...ed electrician according to Electric Facility Engineering Standard and Interior Wire Regulations and the instructions given in this manual and always use a special circuit If the power source capacity is inadequate or electric work is performed improperly electric shock or fire may result Ask the dealer or an authorized technician to install the air conditioner Improper installation by the user ma...

Page 4: ...e protection devices If the pressure switch thermal switch or other protection device is shorted and operated forcibly or parts other than those specified by LGE are used fire or explosion may result Ventilate before operating air conditioner when gas leaked out It may cause explosion fire and burn Securely install the cover of control box and the panel If the cover and panel are not installed sec...

Page 5: ...arp edges when installing It may cause injury Take care to ensure that nobody could step on or fall onto the outdoor unit This could result in personal injury and product damage Do not open the inlet grille of the product during operation Do not touch the electro static filter if the unit is so equipped There is risk of physical injury electric shock or product failure CAUTION n Installation Alway...

Page 6: ... may cause the air condition er to operate erroneously or fail to operate On the other hand the air conditioner may affect such equipment by creating noise that disturbs medical treatment or image broadcasting Do not install the product where it is exposed to sea wind salt spray directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause p...

Page 7: ...plastic bag which was not torn apart they face the risk of suffocation Turn on the power at least 6 hours before starting operation Starting operation immediately after turning on the main power switch can result in severe damage to internal parts Keep the power switch turned on during the operational season Do not touch any of the refrigerant piping during and after operation It can cause a burn ...

Page 8: ...y training and service purposes Part 1 General Information 1 Model Names 9 1 1 Indoor Unit 9 1 2 Outdoor Unit 9 1 3 HR Unit 10 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 ...

Page 9: ...3 TNA4 ARNU093 TNA4 ARNU123 TNA4 ARNU153 TNA4 ARNU183 TNA4 ARNU243 TNA4 ARNU363 TNA4 TM ARNU243 TMA4 ARNU283 TMA4 ARNU363 TMA4 ARNU423 TMA4 ARNU483 TMA4 Ceiling Concealed Duct High Static BH ARNU073 BHA4 ARNU093 BHA4 ARNU123 BHA4 ARNU153 BHA4 ARNU183 BHA4 ARNU243 BHA4 BG ARNU073 BGA4 ARNU093 BGA4 ARNU123 BGA4 ARNU153 BGA4 ARNU183 BGA4 ARNU243 BGA4 ARNU283 BGA4 ARNU363 BGA4 ARNU423 BGA4 BR ARNU283 ...

Page 10: ...s 1Ø 220 240 V 50 Hz 1Ø 220 V 60 Hz PRHR023 PRHR033 PRHR043 1Ø 208 230 V 60 Hz PRHR023A PRHR033A PRHR043A Power Supply 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 1 3 HR Unit Power Supply 2 branches 3 branches 4 branches 1Ø 208 230 V 60 Hz PRHR022A PRHR032A PRHR042A 2 Series 3 Series ...

Page 11: ...KR4 ARNU303SVA4 ARNU363SVA4 ARNU093SFA4 ARNU123SFA4 ARNU093VEA2 ARNU123VEA2 URNU183VJA2 URNU243VJA2 Floor Standing With case ARNU073CEA4 ARNU093CEA4 ARNU123CEA4 ARNU153CEA4 ARNU183CFA4 ARNU243CFA4 Without case ARNU073CEU4 ARNU093CEU4 ARNU123CEU4 ARNU153CEU4 ARNU183CFU4 ARNU243CFU4 Vertical AHU ARNU123NJA4 ARNU183NJA4 ARNU243NJA4 ARNU303NJA4 ARNU363NJA4 ARNU423NKA4 ARNU483NKA4 ARNU543NKA4 Ceiling C...

Page 12: ... 12 Copyright 2020 LG Electronics Inc All rights reserved Only training and service purposes External Appearance 2 2 Outdoor Unit CHASSIS Model Name External Appearance U3 ARUM048GSS5 ARUM036GSS5 ...

Page 13: ...Ceiling Cassette G Low Static ART COOL Type Panel Color R Mirror V Silver B Blue V Silver E Red G Gold 1 Kiss X DX Coil ARU M G S 060 S 5 Serial Number S Standard E High Efficiency H High Ambient C Cold Area R Anti Corosion N Space Saving Model Electrical Ratings Air Discharge Type S Side Discharge T Top Discharge N Top Discharge Standard H P 380V L Top Discharge special H P 8 3 Ø 380 415 V 50 Hz ...

Page 14: ...ervice purposes Serial Number No of Connected branches 02 For 2 branches 03 For 3 branches 04 For 4 branches 06 For 6 branches 08 For 8 branches Indicates that this is System HR Unit using the R410A PRHR 04 3 A Nomenclature 3 3 HR Unit These are model names of the basic function ...

Page 15: ... 15 Copyright 2020 LG Electronics Inc All rights reserved Only training and service purposes Part 2 Outdoor Units ...

Page 16: ... 16 Copyright 2020 LG Electronics Inc All rights reserved Only training and service purposes Function 17 ARU Series ...

Page 17: ...mperature control 25 3 3 Inverter protection control 25 3 4 Phase detection 25 4 Other control 26 4 1 Initial setup 26 4 2 Pump Down 29 4 3 Night Low Noise Function 30 4 4 Vacuum Mode 31 4 5 Static pressure compensation mode 31 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 Function Copyright 2020 LG Electron...

Page 18: ... be set various step at installation mode 2 Heating mode Tc can be set various step at installation mode Note By setting dip switch Te and Tc are decided simultaneously 1 1 Normal operation 1 Basic control Compressor Fan Main EEV Subcooling Indoor Unit EEV EEV Fuzzy control Fuzzy control Full open Fuzzy control Superheat fuzzy control Fuzzy control Subcooling fuzzy control Fuzzy control Fuzzy cont...

Page 19: ...e equivalent to low pressure 2 Subcooling EEV control about 15 59 Subcooling EEV works with fuzzy rules to keep the degree of Subcool at the outlet of subcooler during cooling mode The degree of Subcool Tcondensation Tliquid Tliquid temperature at outlet of subcooler Tcondensation condensation temperature equivalent to high pressure 3 Avoiding excessive high discharge temperature when main EEV ope...

Page 20: ... n Oil return process ends if compressor protection control starts OFF 40 pulse Normal control Normal control Ending ON 400 pulse Normal control Normal control Running OFF 40 pulse Normal control Normal control Starting Oil return signal Thermo off unit EEV Thermo on unit EEV Fan Component Outdoor Unit Indoor Unit Min pulse Max pulse Normal control 30Hz Ending Min pulse Max pulse Normal control Se...

Page 21: ...600 ơ 60 100 pulse 1200 ơ 600 ơ Normal Control Normal control Ending 400 800 pulse 400 800 pulse Running 60 100 pulse Normal control Normal control Normal control Starting Thermo off unit EEV Thermo on unit EEV Fan Component Outdoor Unit 4way valve 1 Subcooling EEV Main EEV Fan Inverter compressor Component ON Min pulse Min pulse Min pulse Normal control OFF OFF 30 Hz Starting Max pulse Setting Va...

Page 22: ...pulse Normal control Normal control Normal control Starting Thermo off unit EEV Thermo on unit EEV Fan Component ON OFF OFF 4way valve 1 OFF OFF OFF 4way valve 2 Function 2 2 Defrost Defrost operation eliminates ice accumulated on heat exchanger recovering performance of heat exchanger Each cycle component operates as following table during defrost operation n Ending condition 1 All heat exchanger...

Page 23: ... Min pulse Min pulse Stop 0 Hz Operation Subcooling EEV Main EEV Fan Inverter compressor Component Note Subcooling EEV Main EEV Fan Inverter compressor Component Min pulse Min pulse Stop 0 Hz Operation Heat Pump ON Heat Recovery OFF 4way valve 2 OFF 4way valve 1 OFF 4way valve 2 OFF over 30 C 86 F air temperature ON 4way valve 1 2 3 2 Stopping operation on heating mode ...

Page 24: ...z or less 10 seconds RPM holding Pd 3480 kPa 504 7 psi Normal control Pressure Range Compressor Fan Ps 110 kPa 15 9 psi Stop 1 min later Stop Ps 150 kPa 21 8 psi 10 Hz 10 seconds 100 RPM 10 seconds Ps 150 kPa 21 8 psi Frequency holding RPM holding Ps 185 kPa 26 8 psi 2 Hz or less 20 seconds 100 RPM 10 seconds Ps 220 kPa 31 9 psi 2 Hz or less 10 seconds 100 RPM 10 seconds Ps 260 kPa 37 7 psi Normal...

Page 25: ... Compressor Sub cooling EEV IDU EEV Tdis 113 235 4 5 Hz 10 seconds SC SH decrease control SH decrease control Tdis 110 230 5 Hz 30 seconds SC SH decrease control SH decrease control Tdis 105 221 Frequency holding SC SH decrease control SH decrease control Tdis 100 212 3 Hz or less SC SH decrease control SH decrease control Tdis 100 212 Normal control SC SH decrease control SH decrease control Heat...

Page 26: ...tup 1 Step 1 factory setting value display Factory setting value is displayed in 7 segment on PCB for 24 seconds All dip switches must be set properly before step 1 4 Other control Power is on Master model code is displayed 3 seconds In case of 5 TON 07 Blank 6 seconds Total capacity including sub units is displayed 2 seconds Heat Pump Display 2 is default value Heat Recovery Display 3 is default ...

Page 27: ...CB is pressed for 6 seconds During auto addressing 7 segment on main PCB displays 88 After auto addressing the number of indoor units is displayed in 7 segment for 30 seconds The address of each indoor unit is displayed on each wired remote controller Push address red button for 3 seconds Auto address starts Auto address is in progress max 15 min The number of indoor units is displayed for 30 seco...

Page 28: ...ation oFF op1 op3 selected the option change the set value blank save in EEPROM Night low noise oFF op1 op15 selected the option change the set value blank save in EEPROM ODU address 0 254 set the value change the set value blank save in EEPROM Snow removal rapid defrost oFF op1 op3 selected the option change the set value blank save in EEPROM Target pressure adjust ing oFF op1 op7 selected the op...

Page 29: ...ing Refer to DIP switch setting page All IDU cooling operation Press the red button SW01C Current low pressure Current low pressure Current low pressure under 307 kPa 44 5 psi blink Note 1 Note 2 Yes Low pressure 229 kPa 33 2 psi IDU ODU OFF Power reset after DIP switch off Pump down completed Press the red button SW01C Satisfy low pressure target Case 1 ODU Service Valve Setting for Heat Recovery...

Page 30: ... not used set the dip S W OFF and reset the power If ODU Hz and RPM change cooling capacity may go down RPM Time Settings Service PCB DIP switch on No 5 Select the mode using Button Func Push the button Select the Function using Button Fn3 Push the button Select the Option using Button op1 op15 Push the button Start the Night low noise function Save the selected option value in EEPROM Step Judgmen...

Page 31: ... VACC ODU V V open ODU EEV open IDU EEV open Vacuum mode setting method Vacuum mode cancellation method Push the reset button on Master unit PCB Select the mode using ȯ ȭ Button SVC Push the button Select the Function using ȯ ȭ Button Se3 Push the button Service PCB DIP switch on No 5 Select the mode using ȯ ȭ Button Func Push the button Select the Function using ȯ ȭ Button Fn2 Push the button Sel...

Page 32: ...ction Display the cycle data value selected from the Segment No Title 7 seg example Seg_1 Seg_2 Seg_3 Seg_4 1 Current High Pressure P1 4321 kPa 626 7 psi 4 3 2 1 2 Current Low Pressure P2 1234 kPa 179 psi 1 2 3 4 3 Inv Comp H1 120 Hz 1 2 0 4 Fan1 H3 110 RPM 1 1 0 5 Fan2 H4 110 RPM 1 1 0 6 Superheating degreee T1 53 5 3 0 7 Subcooling degreee T2 4 5 4 5 8 ODU temp T3 10 1 0 0 9 Suction temp T4 43 4...

Page 33: ...ing ȯ ȭ Button SVC Push the button Select the Function using ȯ ȭ Button Se 9 Push the button Select the Option using ȯ ȭ Button oFF op1 op2 Push the button Refrigerant noise reduction mode is set mode setting Option Setting Off Fast cooling Fast heating op1 Powerful Refrigerant noise reduction Mode op2 Mild Refrigerant noise reduction Mode CAUTION Ask an authorized technician to setting a function...

Page 34: ... ȭ Button Func Push the button Select the Function using ȯ ȭ Button Fn6 Push the button Select the Option using ȯ ȭ Button oFF op1 op3 Push the button Mode setting setting Mode oFF Not setting op1 Snow removal mode op2 Rapid defrost mode op3 Snow removal mode Rapid defrost mode CAUTION Ask an authorized technician to setting a function If do not use a function set an off mode For cold and humid ar...

Page 35: ... Not operate Heating Heating Left side off Not operate Fan mode Off CAUTION 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 4 9 Cool Heat Selector Only Heatpump Master unit PCB DIP switch on No 5 Select the mode using ȯ ȭ Button Func Push the button Select the Function using ȯ ȭ Button Fn1 Push the but...

Page 36: ... 36 Copyright 2020 LG Electronics Inc All rights reserved Only training and service purposes Part 3 HR Units ...

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

Page 38: ...7 8 Ø 22 2 7 8 Sound Absorbing Insulation Material Polyethylene Foam Current Minimum circuit Amps MCA 0 2 Maximum fuse Amps MFA 15 Power Supply 1 Ø 220 240 V 50 Hz 1 Ø 220 V 60 Hz 1 Ø 208 230 V 60 Hz Model PRHR023 PRHR023A PRHR033 PRHR033A PRHR043 PRHR043A Max Connectable No of Indoor Units 16 24 32 Max Connectable No of Indoor Units of a branch 8 8 8 Net Weight kg 14 9 16 7 18 2 lbs 32 8 36 8 40 ...

Page 39: ...nch Ø 9 52 3 8 Ø 6 35 1 4 Gas Pipe mm inch Ø 15 88 5 8 Ø 12 7 1 2 Outdoor Liquid mm inch Ø 15 88 5 8 Low Pressure mm inch Ø 28 58 1 1 8 High Pressure mm inch Ø 22 2 7 8 Sound Absorbing Insulation Material Polyethylene Foam Power Supply 1 Ø 220 240 V 50 Hz 1 Ø 220 V 60 Hz 1 Ø 208 230 V 60 Hz Notes 1 Voltage range Units are suitable for sue on electrical systems where voltage supplied to units termi...

Page 40: ...as pipe Liquid pipe connected with indoor unit LP2 Liquid pipe 2 Control the path for heating or cooling SOL1 2 Solenoid assembly 1 2 Liquid pipe connected with outdoor unit LP1 Liquid pipe 1 Pipe for high pressure gas HPGV High pressure gas pipe Pipe for low pressure gas LPGV Low pressure gas pipe Major function Symbol Parts name Balancing valve Subcooling EEV Low pressure gas pipe High pressure ...

Page 41: ... pipe connected with indoor unit LP IDU Liquid pipe to Indoor unit Control the path for heating or cooling SOL1 2 Solenoid assembly 1 2 Liquid pipe connected with outdoor unit LP ODU Liquid pipe to Outdoor unit Pipe for high pressure gas HPGV High pressure gas pipe Pipe for low pressure gas LPGV Low pressure gas pipe Major function Symbol Parts name Balancing valve Liquid bypass valve Solenoid ass...

Page 42: ...1 HR Units Dimensions CHASSIS CODE Outdoor Unit PRHR042 PRHR042A PRHR032 PRHR032A PRHR022 PRHR022A Unit mm inch 76 Seongsan dong Changwon City Gyeongnam 641 713 Korea 480 18 29 32 152 5 31 32 345 13 19 32 98 3 27 32 481 18 15 16 174 6 27 32 453 17 27 32 204 8 1 32 218 8 19 32 38 1 1 2 60 2 3 8 30 1 3 16 ...

Page 43: ...S CODE HR Unit PRHR023 PRHR023A PRHR033 PRHR033A PRHR043 PRHR043A Unit mm inch LG Electronics Inc Changwon 2nd factory 84 Wanam ro Seongsan gu Changwon si Gyeongsangnam do KOREA 500 19 11 16 176 6 15 16 481 18 29 32 311 12 1 4 150 5 29 32 486 19 1 8 150 5 29 32 40 1 9 16 55 2 5 32 218 8 19 32 19 3 4 125 4 15 16 ...

Page 44: ...s CHASSIS CODE HR Unit PRHR063 PRHR063A PRHR083 PRHR083A Unit mm inch LG Electronics Inc Changwon 2nd factory 84 Wanam ro Seongsan gu Changwon si Gyeongsangnam do KOREA 176 6 15 16 481 18 29 32 311 12 1 4 125 4 15 16 809 31 27 32 793 31 7 32 160 6 5 16 160 6 5 16 40 1 9 16 55 2 5 32 19 3 4 218 8 19 32 ...

Page 45: ... pipe Gas pipe Liquid pipe Gas pipe s Solenoid EEV Sensor A B C D 1 HR Unit Ⓐ To be switched operation between cooling and heating by two Solenoid valve Ⓑ To be used decreasing noise according to sub cooling of inlet and outlet of indoor unit Simultaneous operation Ⓒ To prevent liquid charging between high pressure gas valve and HR unit at cooling mode Ⓓ To be controlled the pressure between high ...

Page 46: ...imultaneous operation Ⓒ To prevent liquid charging between high pressure gas valve and HR unit at cooling mode Ⓓ To be controlled the pressure between high and low pressure pipe during operation switching Low pressure gas pipe s Solenoid EEV Sensor s C A B D Liquid pipe High pressure gas pipe Gas pipe Gas pipe Gas pipe Gas pipe Gas pipe Gas pipe Gas pipe Gas pipe Liquid pipe Liquid pipe Liquid pip...

Page 47: ...ss for room3 CN11 Solenoid valve 04 Bypass for room4 CN12 Solenoid valve bypass CN14 Sub cooling EEV CN16 SC Out Sensor sub cooling out CN16 SC In Sensor sub cooling in CN18 Liquid Sensor liquid receiver SW01M Solonoid valve number Setting When manual address SW02M 1 Selecting auto address or manual address SW02M 2 3 Setting total number of indoor connected SW03M Setting the address of indoor_10 W...

Page 48: ... LIQUID Sensor Liquid Receiver CN_SOL_VALVE Solenoid Valve Bypass 01 SW01E Setting EEV Number When Manual Address Setting Time of Zoning Address When Auto Address SW02E 1 Selecting Auto Address or Manual Address SW02E 2 4 Setting Total Number of Indoor connected SW02E 5 Setting Slave PCB SW02E 6 Setting EEPROM Reset SW02E 7 8 Setting Mode Zoning etc SW01C Setting HR Unit Number Setting EEV Number ...

Page 49: ...All rights reserved Only training and service purposes OPTIONAL OR FACTORY INSTALLED This Function can be optional or factory installed depending on the application model You must purchase the optional parts in order to use them 3 PRHR043 PRHR033 PRHR023 ...

Page 50: ...nc All rights reserved Only training and service purposes 4 PRHR083A PRHR063A OPTIONAL OR FACTORY INSTALLED This Function can be optional or factory installed depending on the application model You must purchase the optional parts in order to use them ...

Page 51: ...ed Only training and service purposes Wiring Diagrams 5 PRHR043A PRHR033A PRHR023A OPTIONAL OR FACTORY INSTALLED This Function can be optional or factory installed depending on the application model You must purchase the optional parts in order to use them ...

Page 52: ...essure gas valve After 30 seconds Open Open Close Keep Liquid valve Close Open Close Close Operating mode Mode change timer H P gas valve L P gas valve Balancing valve Cooling 120 timer Keep Keep Close 0 timer 120 Close Close Open timer 0 Close Open Close Heating 180 timer Keep Keep Close 0 timer 180 Close Close Close timer 0 Open Close Close Stop or ventilation 0 timer 5 Cooling mode Close Keep C...

Page 53: ... 2 Liquid Bypass Control 2 3 Subcooling EEV Control Target about 25 77 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 2 Special Control Component Starting Running Ending Inverter compressor Stop 60 Hz 40 Hz High pressure gas valve Keep Close Open or Cl...

Page 54: ... 54 Copyright 2020 LG Electronics Inc All rights reserved Only training and service purposes Part 4 PCB Setting and Test Run ...

Page 55: ...ual Valve ID Address 67 8 Method of checking the pipe detection result at outdoor unit 67 HR Unit PCB PRHR 3A 08 06 04 03 02 68 1 Switch for Setup of HR Unit 69 2 Automatic Addressing 76 3 Flow chart for Chart for Auto Addressing of Indoor and HR Unit 77 4 Example of Manual Valve Addressing Non Zoning setting 80 5 Example of manual valve addressing Zoning setting 81 6 Example of Checking Valve Add...

Page 56: ...tory production preset to OFF No 8 Use only in factory production preset to OFF SW02M 1 Selection of the method for addressing valves of an HR unit Auto Manual SW02M Dip switch for setup of The function of HR unit SW03M SW04M SW01M SW03M SW04M Switch for manual valve addressing SW01M SW05M 1 valve housing 4 valve housing 7 SEG 1 Main function of SW02M 1 Switch for Setup of HR Unit Zoning setting O...

Page 57: ...ch for 2 branches HR unit If you want to use a PRHR032 A for 3 branches HR unit after closing the 4th pipes set the dip switch for 3 branches HR unit 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 For 2 branches PRHR022 A For 3 branches PRHR03...

Page 58: ...nit Indoor unit Indoor unit 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 Models ARBLB03321 413 16 1 4 390 15 11 32 I D19 05 3 4 I D19 05 3 4 I D19 05 3 4 I D12 7 1 2 I D12 7 1 2 I D12 7 1 2 I D12 7 1 2 I D12 7 1 2 74 2 29 32 70 2 3 4 I D15 88 5 8 I D15 88 5 8 I D25 4 1 I D25 4 1 O D25 4 1 80 3 5 32 110 4 11 32 332 13 1 16 321 12 5 8 83 3 9 32 1 2 3 3 O D19 05 3 4 O D19 05 3 4 1 2 I D22 2 7 8 I D22 2 7 ...

Page 59: ...ve in the HR unit Set the address of the valve of the HR unit to the central control address of the connected indoor unit SW01M selection of the valve to address SW03M increase in the digit of 10 of valve address SW04M increase in the last digit of valve address Prerequisite for manual valve addressing central control address of each indoor unit must be preset differ ently at its wired remote cont...

Page 60: ...M increase in the last digit of valve address SW05M Rotary S W Prerequisite for manual valve addressing central control address of each indoor unit must be preset differently at its wired remote control S W No Setup No 1 Manual addressing of valve 1 No 2 Manual addressing of valve 2 No 3 Manual addressing of valve 3 No 4 Manual addressing of valve 4 SW03M Increase in the digit of 10 of valve addre...

Page 61: ...numbers of connected indoor units Numbers of connected indoor units whose addressing is completed are indicated for 30 seconds on 7 segment LED of the outdoor unit PCB After completing addressing address of each indoor unit is indicated on the wired remote control display win dow CH01 CH02 CH03 CH06 Indicated as numbers of connected indoor units CAUTION In replacement of the indoor unit PCB always...

Page 62: ...t LED after completing setting Indoor address number is displayed on wired remote control or indoor unit display window It is not an error message will disappeared when on off button is pressed on remote control ex Display of 01 02 15 means connection of 15 indoor units and Automatic addressing is completed normally Automatic addressing start Waiting 3 minutes Power On Press RED Button for 5 secon...

Page 63: ...is over 15 C 59 F Atc Using Outdoor temperature is below 15 C 59 F Ath Using 88 is displayed on 7 SEG of the outdoor unit main PCB Outdoor unit is operated for 5 60 minues The number of indoor units detected is displayed for 30 seconds on the outdoor unit PCB after outdoor unit stopped Display error on outdoor unit PCB Display error on HR unit PCB Outdoor unit PCB HR HR unit number Valve number HR...

Page 64: ...ss of the indoor unit connected to the valve Reset the power of outdoor unit PCB Wait for about 5 minutes The number of the indoor units installed is displayed Ex HR The number of the indoor Check the central control address of indoor and HR unit Make sure that reset the outdoor unit power when changing the central control unit Are the number of indoor units connected to the outdoor unit and displ...

Page 65: ...ntents Operation Turn No 1 of SW01M on to address valve 1 Display Existing value saved in EEPROM is displayed in 7 SEG Operation Set the digit of 10 to the number in group high data of the wired remote control connected to the corresponding indoor unit to the valve 1 by pressing SW03M Display Digit increasing with the times of pressing tack switch is displayed in left 7 SEG Operation Set the digit...

Page 66: ...se where 3 indoor units is connected in piping 1 sets from rotary switch 0 1 2 and 3 4 5 with FF set Prerequisite for manual valve addressing central control address of each indoor unit must be preset differently at its wired remote control Operation None Display None No 1 2 3 4 5 6 7 Display and setup Setup and Contents Operation Turn dip S W No 1 on to address valve 1 Display Existing value save...

Page 67: ...itches turned on Display Er is displayed in 7 SEG No 1 Display and setup Setup and contents SW01M 6 Example of Checking Valve Address 7 Identification of Manual Valve ID Address 8 Method of checking the pipe detection result at outdoor unit ROTARY 01 ROTARY 02 0 0 1 Wait for 5 minutes after Pipe detection is completed 2 Turn on the No 10 14 16 DIP S W of Sub PCB at Outdoor unit 3 Check the data on...

Page 68: ... Branch 1 2 High Low from top Branch 5 8 Bypass from left Branch 7 8 High Low from top Branch 5 6 High Low from top 7 SEG Main PCB 2EA same P No 7 SEG Liquid Bypass Valve SW02E Use only SW No 5 SW01E Branch 5 8 from SW No 1 SW01C SW01D SW01C SW02B SW01B SW02E SW01E Branch 1 4 from SW No 1 Branch No Number from left in sequence for less than 8 branch model PRHR043 PRHR043A PRHR033 PRHR033A PRHR023 ...

Page 69: ...ection of the valve to address Rotary SW 0 SW01D Left Selection of the Valve Group Control Setting to address HR units SW01C Right Manual addressing of zoning indoor units Push SW SW02B Left Increase in the digit of 10 SW01B Right Increase in the digit of 1 ON S W Selection No 1 Method for pipe detection of an HR Unit Auto Manual No 2 No of connected branches No 3 No 4 No 5 Master Slave Main PCB S...

Page 70: ...served Only training and service purposes NOTE Do not turn on any SW02E on Slave Main PCB except No 5 Slave Slave Auto Manual Master Master Switch No 1 Off Switch No 1 On 2 Selection of Master Slave Main PCB Master Slave Switch No 5 Off Switch No 5 On Master Only ...

Page 71: ...dip switch for 4 branches HR Unit 3 Setting the zoning control SW02E setting SW01E setting Normal control Master Master Only SW01E Zoning control Master Master Only Master SW01E Turn the dip switch of the zoning branch on EX Branch 1 2 are zoning con trol 4 Selection of the No of connected branches 1 branch Connected 5 branch Connected 2 branches Connected 6 branch Connected 3 branches Connected 7...

Page 72: ...9 05 3 4 I D9 52 3 8 I D9 52 3 8 I D9 52 3 8 I D9 52 3 8 Low Pressure Gas Pipe High Pressure Gas Pipe Liquid pipe Y branch pipe For more information refer accessory installation manual Unit mm inch Note If the large capacity indoor units are installed below Y branch pipe should be used NOTE Use the Valve Group Control when 2 branches are connected with only 1 indoor unit which has higher capacity ...

Page 73: ... SW01C SW01E SW02B Dip S W and push S W for Manual pipe detection Set the address of the valve of the HR unit to the central control address of the connected indoor unit SW01E selection of the valve to address SW02B increase in the digit of 10 of valve address SW01B increase in the last digit of valve address SW01C Manual addressing of zoning indoor units use for Zoning setting Prerequisite for Ma...

Page 74: ...it of 10 of valve address SW01B SW01B Increase in the last digit of valve address SW01C 0 SW01C Manual addressing of zoning indoor units Use for Zoning setting SW01E SW01E SW 1 On Select Valve 1 Master ON OFF SW02B SW01B Input the central control address of Indoor unit Master SW01E SW 1 Off Finish Valve 1 Master ON OFF SW01E SW 2 On Select Valve 6 Slave ON OFF SW02B SW01B Input the central control...

Page 75: ... unit input the central control address of indoor unit Slave After selecting No 2 zoning indoor unit input the central control address of indoor unit Setting SW01C to 0 After selecting No 3 zoning indoor unit input the central control address of indoor unit SW01E SW 1 Off Finish Valve 5 Slave ON OFF SW01E SW 2 On Select Valve 6 Slave ON OFF SW02B SW01B Input the central control address of Indoor u...

Page 76: ...on numbers of connected indoor units Numbers of connected indoor units whose addressing is completed are indicated for 30 seconds on 7 segment LED of the outdoor unit PCB After completing addressing address of each indoor unit is indicated on the wired remote control display win dow CH01 CH02 CH03 CH06 Indicated as numbers of connected indoor units CAUTION In replacement of the indoor unit PCB alw...

Page 77: ...t LED after completing setting Indoor address number is displayed on wired remote control or indoor unit display window It is not an error message will disappeared when on off button is pressed on remote control ex Display of 01 02 15 means connection of 15 indoor units and Automatic addressing is completed normally Automatic addressing start Waiting 3 minutes Power On Press RED Button for 5 secon...

Page 78: ...s displayed on 7 SEG of the outdoor unit main PCB Outdoor unit is operated for 5 60 minues The number of indoor units detected is displayed for 30 seconds on the outdoor unit PCB after outdoor unit stopped Display error on outdoor unit PCB Display error on HR unit PCB Outdoor unit PCB HR HR unit number Valve number HR unit 200 Check the HR unit and indoor unit Pipe detection error occur after 30 s...

Page 79: ...s of the indoor unit connected to the valve Reset the power of outdoor unit PCB Wait for about 5 minutes The number of the indoor units installed is displayed Ex HR The number of the indoor Check the central control address of indoor and HR unit Make sure that reset the outdoor unit power when changing the central control unit Are the number of indoor units connected to the outdoor unit and displa...

Page 80: ...y None No 1 2 3 4 5 Display and setup Setup and Contents Operation Turn dip S W No 1 on to address valve 1 Display Existing value saved in EEPROM is displayed in 7 SEG Operation Set the digit of 10 to the number in Group High data of the wired remote control connected to the corresponding indoor unit to the valve 1 by pressing left tack S W Display Digit increasing with the times of pressing tack ...

Page 81: ...The case where 3 indoor units is connected in piping 1 sets from rotary switch 0 1 2 and 3 4 5 6 7 with FF set Prerequisite for manual valve addressing central control address of each indoor unit must be preset differently at its wired remote control Above setup must be done for all HR unit valves The valve that is not connected with any indoor unit should be addressed with any other number than u...

Page 82: ...ng of Master IDU in zoning In case that an indoor unit of central control address 11 is connected to a valve 1 of an HR unit Operation Turn dip switch No 1 on Display 11 is displayed in 7 SEG No 1 2 Display and setup Setup and contents Operation Turn dip switch No 1 on 7 SEG disappeared SW01E SW01E Operation more than 2 dip switches turned on Display Er is displayed in 7 SEG No 1 Display and setup...

Page 83: ...frigerant to evaporate increasing the insulation resistance Check if high low pressure common pipe liquid pipe and gas pipe valves are fully opened NOTE Be sure to tighten caps Check if there are any problems in automatic addressing or not Check and confirm that there are no error messages in the display of indoor units or remote controls and LED in outdoor units 1 Checks Before Test Run CAUTION w...

Page 84: ...en outdoor heat exchanger part Low pressure error or discharge temper ature error Motor insulation broken Strainer clogged Oil leakage Motor insulation failure R S T misconnection Motor failure bad ventilation around outdoor heat exchanger Bad connector contact Coil failure EEV clogged EEV clogged Check resistance between terminals and chassis Change strainer Check Oil level after opening oil port...

Page 85: ...tronics Inc All rights reserved Only training and service purposes Test Run n Location of setting Switch 3 DIP Switch Setting DIP SWITCH SW01D reset SW04C x cancel 7 Segment SW03C forward SW02C backward SW01C confirm Service PCB ...

Page 86: ... is OFF Checking the initial display The number is sequentially appeared at the 7 segment in 5 seconds after applying the power This number represents the setting condition For example represents R410A 7HP 4 Checking the setting of outdoor units Initial display order Example ARUB060GSS4 07 3 22 1 Order No Note 4 12 Model capacity 1 Cooling only 2 Heat pump 3 Heat Recovery 22 220V 1 Standard Test R...

Page 87: ... 87 Copyright 2020 LG Electronics Inc All rights reserved Only training and service purposes Part 5 Trouble shooting guide ...

Page 88: ...Checking Method for Key Components 90 2 1 Compressor 90 2 2 Fan Motor 91 2 3 Electronic Expansion Valve 92 2 4 Inverter IGBTM Checking Method 95 2 5 Pressure Sensor High Low Pressure Sensor 96 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 Trouble shooting guide ...

Page 89: ...uent defrosting No operation sound after switching ON the power supply Heating failure frozen outdoor heat exchanger part Low pressure error or discharge temper ature error Motor insulation broken Strainer clogged Oil leakage Motor insulation failure R S T misconnection Motor failure bad ventilation around outdoor heat exchanger Bad connector contact Coil failure EEV clogged EEV clogged Check resi...

Page 90: ...re there is danger to determine that failure of the inverter occurred 2 You can use rectification voltmeter if using commercial frequency tester when measuring output values of the inverter when measuring absolute values Accurate measuring values cannot be obtained with a gen eral movable tester For analog and digital mode 1 2 Is how long power on during operation Does failure appears again when s...

Page 91: ... power supply is abnormal 2 For wrong wiring Modify connection status in front of or at the rear of the breaker or if the power terminal console is at frosting condition Modify the power supply voltage is beyond speci fied scope For following wiring 1 Check connection status 2 Check contact of the connector 3 Check that parts are firmly secured by tightening screws 4 Check connection of polarity 5...

Page 92: ...ferent or continuously in the ON state motor will not operate smoothly and start vibrating EEV valve operation ø1 ON ON OFF ON ø2 ON ON ON OFF ø3 OFF OFF ON OFF ø4 OFF OFF OFF ON Output ø No Output state 1 2 3 4 Valve open Angle close pulse open Full open 1950 pulses At power ON open angle signal of 1400 pulses out put and valve position is set to ⓐ If valve operates smoothly no noise and vibratio...

Page 93: ...rposes Checking Method for Key Components EEV Coil and body Outdoor unit Remove and assemble the coil Lead wire Coil Body Body Body Grip the A part tightly and pull up coil part upward When the coil part is removed or assembled be careful not to bend the pipe of the body Assemble Remove ...

Page 94: ...here is any leakage then the temperature is down If measured temperature is very low in comparison with suction temperature which is displayed at remote controller then the valve is not fully closed If the amount of leakage is much Replace EEV Indoor unit Full closing valve leakage Incomplete Connector connection or assembly Check the incorrectly connected part Outdoor Unit Indoor Unit Replace EEV...

Page 95: ...s small 0 Ω or high hundreds MΩ PCB needs to be replaced 6 In case that IGBTM is damaged check if comp is needed to be replaced PCB damaged Red and black are the measuring terminals of multi tester P N U V W CN_U CN_V CN_W CN_INPUT_L1 CN_INPUT_L2 P N Checking Method for Key Components P terminal black N terminal red U terminal red 0 2 V 0 6 V V terminal red 0 2 V 0 6 V W terminal red 0 2 V 0 6 V U...

Page 96: ... 4 The composition of pressure sensor The pressure sensor is composed like the circuit picture shown above If DC 5 V voltage flows on red and black wire voltage would be made between the white and black wire The pressure which is equivalent to the pressure output is shown in the table above 1 The outdoor fan is controlled by the inverter motor which can control the number of rotations 2 The outdoo...

Page 97: ...lve 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 D Discharge E Evaporator C Condensor S Suction Checking Method for Key Components Heat Recovery Heating Operation Cooling Operation 4way Valve 1 4way Valve 2 Outdoor Heat Exchanger On Outdoor Heat Exchanger Indoor Heat Exchanger Off Outdoor Heat Exchanger Indoo...

Page 98: ...tor2 Checking Method for Key Components 98 Copyright 2020 LG Electronics Inc All rights reserved Only training and service purposes 2 8 Temperature Sensor 1 Outdoor temperature sensor TH1 2 Discharge pipe D pipe temperature sensor TH2 1 Check the condition of installation and the contact of temperature sensor 2 Check whether the connector contact of temperature sensor is normal 3 Measure the resis...

Page 99: ...ulti Tester as Diode Voltage Measurement Mode 3 Measure the voltages of P U P V P W as shown in Fig 1 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 Fan IPM Check Checking Method for Key Components 99 Copyright 2020 LG Electronics Inc All rights reserved Only training ...

Page 100: ...door unit Failing to receive outdoor unit signal in indoor unit PCB 0 6 Outlet pipe temperature sensor of indoor unit Outlet pipe temperature sensor of indoor unit is open or short 0 9 Indoor EEPROM Error In case when the serial number marked on EEPROM of Indoor unit is 0 or FFFFFF 1 0 Poor fan motor operation Disconnecting the fan motor connector Failure of indoor fan motor lock Outdoor unit rela...

Page 101: ... Unit Suction Temperature Sensor open or short 5 0 Omitting connection of R S T power of Outdoor Unit Omitting connection of outdoor unit 5 1 Excessive capacity of indoor units Excessive connection of indoor units compared to capacity of Outdoor Unit 5 2 Communication error inverter PCB Main PCB Failing to receive inverter signal at main PCB of Outdoor Unit 5 3 Communication error indoor unit Main...

Page 102: ... of HR unit open or short 2 0 3 C HR HR unit1 Sub Cooling Pipe Out sensor error Sub Cooling Pipe Out sensor of HR unit open or short 2 0 4 C HR Communication error Failing to receive HR unit signal at outdoor unit 2 0 5 C HR Communication error between HR unit and the upgraded 485 modem 4 series upgraded 485 communication error between HR unit and HR unit modem 2 0 6 C HR Duplicate address error o...

Page 103: ...open or less than 100 Ω short Error occurs Refer Resistance value maybe change according to temperature of temp sensor It shows according to criteria of current temperature 5 margin Normal Air temp sensor 10 C 20 7 kΩ 25 C 10 kΩ 50 C 3 4 kΩ Pipe temp sensor 10 C 10 kΩ 25 C 5 kΩ 50 C 1 8 kΩ n Error diagnosis and countermeasure flow chart Is sensor properly connected to PCB Is the resistance value o...

Page 104: ...or No Error Type Error Point Main Reasons The remote controller did not receive the sig nal from indoor unit during specific time 1 Remote controller fault 2 Indoor unit PCB fault 3 Connector fault Wrong connection 4 Communication cable problem n Error diagnosis and countermeasure flow chart If there is no remote controller to replace Use another unit s remote controller doing well Check cable Con...

Page 105: ...lf with condensate water half level of float switch Is drain pump working Sound drain noise contact etc Replace float switch Replace Indoor PCB or reconnect the connector Yes Yes No No Is Float switch short On measuring its resistance No Yes Drain pump blocked by foreign particles Yes No In indoor unit PCB Does the terminal voltage for drain pump has 220V output Replace indoor unit PCB Replace Dra...

Page 106: ...nly training and service purposes Self diagnosis function Indoor PCB drain pump connector Check input of 220 V Marked as CN DPUMP float A Point to check rotating Float switch Housing CN FLOAT Standard of drain pipe head height slope MAX 450 MAX 700 mm 1 50 1 100 ...

Page 107: ...door PCB fault Replace after checking Re connect communication cable No Yes Indoor PCB fault Replace after checking Note1 communication from IDU is normal if voltage fluctuation 9 V 9 V exists when checking DC voltage of communication terminal between IDU and ODU Is total number of indoor units connected displayed after auto addressing No END If the DC voltage between communication terminal A B of...

Page 108: ...he micro processor and the EEPROM on the sur face of the PCB 2 ERROR due to the EEPROM damage Error No Error Type Error Point Main Reasons Error occur in EEPROM of the Indoor PCB Indoor unit EEPROM error n 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 ...

Page 109: ...ection proper Yes No Connect properly Is fan motor normal Replace indoor unit fan motor It is normal when check hall sensor of indoor fan motor as shown below Yes No k Replace indoor unit PCB Checking connection state of fan motor connector 1 4 5 6 7 1 5 6 7 4 4 4 4 Each termainl with the tester Tester TH chassis hundreds kΩ hundreds kΩ hundreds kΩ hundreds kΩ TD chassis Normal resistance 10 Repla...

Page 110: ...etween each terminal of compressor Refer to the right side tables 2 Check insulation resistance between compressor terminal and pipe over 50 m Replace compressor if abnormality found Are there any power wire connections normal No Yes 1 Check L1 L L2 N wiring condition Rewire them if abnormality found Is Inv PCB normal No Check Inv PCB IPM normality Replace Comp PCB assembly if abnormality found Is...

Page 111: ...yright 2020 LG Electronics Inc All rights reserved Only training and service purposes Self diagnosis function Measuring resistance between each terminal of compressor Compressor wire connector connection point ...

Page 112: ...heck refrigerant pressure Reassemble or manage if abnormality found Is Inv PCB bridge diode joining condition normal No Check joining condition of Inv PCB and bridge diode joining again if abnormality found Yes Is input voltage normal No Check 1 L1 L L2 N phase voltage is 220 V 10 or 240 V 10 Check connection condition and wiring if power is abnormal Yes Is Inv PCB normal No Check Inv PCB IPM norm...

Page 113: ...20 LG Electronics Inc All rights reserved Only training and service purposes Self diagnosis function Measuring resistance between each terminal of compressor Compressor wire connector connection Measuring input voltage ...

Page 114: ...l No Check connection from terminal block to inverter PCB assembly wiring again if abnormality found Is inverter PCB assembly normal No Check inverter PCB assembly IPM normality Replace inverter PCB assembly 23 Inverter Compressor DC Link Low Voltage Error No Error Type Error Point Main Reasons DC Voltage isn t charged after starting relay on 1 DC Link terminal misconnection terminal contact fault...

Page 115: ...or off due to the high pressure switch in outdoor unit Excessive rise of discharge pressure in outdoor com pressor 24 Is high pressure switch connector connected to PCB No Note 1 Note 2 Note 2 Connect securely Is high pressure switch connector short during off time Yes No Is this error appeared again after reset Yes No Is SVC valve open Yes Re check momentary problem or not Replace connecting cabl...

Page 116: ... condition Yes Are there any power wire connections normal No Yes 1 Check L1 L L2 N wiring conditions Rewire them if abnormality found Is input voltage normal No Check L1 L L2 N phase voltage is 220 V 10 or 240 V 10 Check connection condition and wiring if power is abnormal Is Inv PCB bridge diode joining condition normal No Check joining condition of Inv PCB and bridge diode joining again if abno...

Page 117: ...heck refrigerant pressure Reassemble or manage if abnormality found 1 Check resistance between each terminal of compressor Refer to the right side tables 2 Check insulation resistance between compressor terminal and pipe over 50 m Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes No Yes 1 Check Inv PCB U V W...

Page 118: ...opyright 2020 LG Electronics Inc All rights reserved Only training and service purposes Self diagnosis function Measuring resistance between each terminal of compressor Compressor wire connection v u w v u w ...

Page 119: ...n normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check resistance between each terminal of compressor Refer to the right side tables 2 Check insulation resistance between compressor terminal and pipe over 50 m Replace compressor if abnormality found Is com...

Page 120: ...ht 2020 LG Electronics Inc All rights reserved Only training and service purposes Self diagnosis function Measuring resistance between each terminal of compressor Compressor wire connection Measuring input voltage ...

Page 121: ...onent part Replace outdoor unit EEV Does liquid injection corresponded operate normally Check liquid injection corresponded Is there pipe strainer etc clogging Check another components and operation conditions Take measures Replace strainer No Yes No Yes No Yes No Yes No Yes Resistance value of discharge temperature sensor 10 C 50 F 362 k 25 C 77 F 200 k 50 C 122 F 82k 100 C 212 F 18 5 k Error No ...

Page 122: ...ccessive compres sor off due to over increase of high pres sure by high pressure sensor Over increase of dis charge pressure of compressor 34 Is service valve opened No Open service valve Are communication cable pipe connection normal Yes No Is refrigerant amount normal refer refrigerant part Yes No Is fan normal Indoor fan during heating Outdoor fan during cooling Yes No Yes Adjust refrigerant am...

Page 123: ...ened Open service valve Are communication cable piping normal Yes No Is amount of refrigerant normal refer refrigerant part Yes No Is fan normal in heating outdoor fan in cooling indoor fan Yes Adjust the amount of refrigerant Additive charge check communication piping correction Check and replace related parts Is strainer Ok No Replace the strainer No Replace the pressure sensor Yes Yes Check ind...

Page 124: ... V 0 3 V at initial state of power supply 1 Input voltage abnormal L1 L L2 N 2 ODU Inv PCB damage CT sensing part n Error Diagnosis and Countermeasure Flow Chart Measuring input voltage Is input voltage normal No Yes Recheck power and installation condition Check L1 L L2 N phase voltage is 208 V 10 or 230 V 10 Check connection condition and wiring if power is abnormal Is inverter PCB assembly norm...

Page 125: ...sponding sensor Error is generated if the resistance is more than 5 M open and less than 2 k short Note Standard values of resistance of sensors at different temperatures 5 variation 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 Error No Error Type Error Point Main Reasons 41 Compressor1 dis charge pipe tempera ture sensor error ...

Page 126: ...n of high pressure connector 2 Defect of high pressure connector Open Short 3 Defect of outdoor PCB Error No Error Type Error Point Main Reasons Abnormal value of sensor Open Short Abnormal value of sensor Open Short Sensor error of low pressure Sensor error of high pressure 42 43 Is sensor connected to PCB correctly Connect sensor to PCB correctly Yes No No After replacement of outdoor unit main ...

Page 127: ...asons Abnormal value of sensor Open Short Abnormal value of sensor Open Short Abnormal value of sensor Open Short Sensor error of outdoor air temper ature Piping temperature sensor error of heat exchanger in master slave out door unit heat exchanger A B Compressor suc tion temperature sensor error 44 46 45 Is sensor connected to PCB correctly Is sensor value correct Connect sensor to PCB correctly...

Page 128: ...sons Sum of indoor unit capaci ty exceed outdoor unit capacity specification Over Capacity Sum of indoor unit capaci ty is more than outdoor capacity 51 n Error diagnosis and countermeasure flow chart Is capacity sum of indoor units less than 130 of outdoor unit capacity at LGMV No Yes Are quantity and capacity of indoor units installed same as the data of LGMV Yes Adjust the capacity of indoor an...

Page 129: ...unit can t receive signal from Inv PCB Communication error between Inv PCB Main PCB 52 n Error diagnosis and countermeasure flow chart Is communication LED Yellow of Inv PCB on No Re connect communication cable Is communication cable connected correctly Yes No Re connect communication cable Is Main PCB normal Yes No Replace Main PCB Replace Inv PCB The method of checking Main PCB and Inv PCB If no...

Page 130: ...ce communication PCB 3 Auto addressing after replace Communication PCB Check outdoor Main PCB Is communication cable connected correctly No Yes Supply power Is power supplied to indoor PCB No Yes Are quantity of indoor Units installed same as The data of LGMV In case of CH53 almost happened with CH05 the indoor units not operated actually are normal so check with same method of CH05 and additional...

Page 131: ...pyright 2020 LG Electronics Inc All rights reserved Only training and service purposes Self diagnosis function Wiring Fault Case Communication Part in Main PCB Remark IDU A IDU B Indoor Unit Communication PCB ...

Page 132: ...to receive inverter signal at main PCB of Outdoor Unit Communication error Main PCB Inv PCB 57 n Error diagnosis and countermeasure flow chart Are there any communication wire connections normal Is Inv PCB assembly normal Is there any error when power reset Recheck power and installation condition 1 Check communication wiring conditions 2 Check connector conditions Rewire them if abnormality found...

Page 133: ...efect wrong insertion 2 Different EEPROM Version 3 ODU Inv PCB assembly damage n Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion normal No Yes Recheck power and installation condition 1 Check EEPROM insert direction connection condition 2 Check EEPROM Check SUM Replace if abnormality found Is Inv PCB normal No Yes Replace Inv PCB Inv EEPROM inserting point Right inserting directi...

Page 134: ...EEV Defect Ref Overcharge Is Installation Condition Normal No 1 Check Pipe Clogging Distortion 2 Check Covering Outdoor Indoor Unit 3 Check EEV Connector Assemble Condition Normal Operation 4 Check Refrigerant Pressure 5 Check Power Wire Connection Condition Reassemble or Manage if abnormality Found 1 Check Inv PCB Screw Connection Condition Reassemble or Manage if abnormality Found No Inv PCB IPM...

Page 135: ...100 Ω below short will generate error Note Temperate sensor resistance vary with temperature So compare temperature sensor resistance value according to outdoor unit temperature by referring below table 5 tolerance Air temperature sensor 10 C 20 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 Error No Error Type Error Point Main Reasons 65 Outdoor unit liquid p...

Page 136: ...ermeasure Flow Chart Is ODU Fan Motor Assemble condition normal No Yes Recheck power and installation condition Check ODU Fan Motor assemble condition and fan locking Reassemble or replace if abnormality found Is ODU Fan Motor normal No Yes 1 Check resistance between each phase U V W of ODU fan motor terminal 16 8 Ω 5 at 75 2 Check insulation resistance between ODU fan motor terminal U V W Replace...

Page 137: ...Main Reasons EEPROM Access Error Main PCB EEPROM 86 n Error Diagnosis and Countermeasure Flow Chart Reset after checking EEPROM assemble condition Replace Correct EEPROM EEPROM Insertion Same direction both socket hole and EEPROM hole Yes No Yes No Is EEPROM assemble condition normal Correct check sum Recheck power and installation condition Note Replace after power off Main PCB EEPROM ...

Page 138: ...perature sensor resistance value according to outdoor unit temperature by referring below table 5 tolerance 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 Error No Error Type Error Point Main Reasons 113 Outdoor unit liquid pipe condenser tem perature sensor error Abnormal sensor resis tance value Open Short 1 Defective temperatu...

Page 139: ...nnection Error No Error Type Error Point Main Reasons Discharge superrheat is under 3 liquid back Discharge superheat low CH1501 Is there indoor unit which leaks ref much1 Is SC EEV or SC circuit leaks Is EEV head Coil assembly normally Change SC EEV or SC EEV assembly Assemble again or change EEV head coiL Change EEV assembly Yes Yes Yes Is EEV connector connected normally 1 Ref leakage much Both...

Page 140: ...nnection are properly connected No Reconnect it After reset can we check supply voltage at PCB when starting heating mode operation No Is 4 way valve coil connected to 4 way valve normally ø No Is 4 Way valve coil resistance normal Change 4 Way valve coil No Yes In case of more than 2 units does master outdoor unit recognize as more than 2 units Refer to CH 51 make measure Yes Is compressor workin...

Page 141: ...ocket during heating operation 1 HR unit s power cable or communication cable connec tion defect 2 After auto addressing wrong address setting of the indoor unit Defective indoor power transmission error and PCB defect 3 Wrong setting of the HR unit s rotary switch or dip switch 4 HR unit PCB defect Error No Error type Error point Main reasons After the auto operation if the number of the indoor u...

Page 142: ...If indoor unit has not been connected to 1 valve of HR unit set pipes of HR unit manually 6 If it is not applied as above set pipes of HR unit as manual NB How to check display method of outdoor main PCB 7 segment 88 Indoor qty which check thru Auto Addressing 88 Indoor qty which check thru piping checking n Error diagnosis and countermeasure flow chart Defective temperature sensor connection Defe...

Page 143: ... n Error diagnosis and countermeasure flow chart n HR unit error display No n Example of HR unit error display 1 Check connection condition of temperature sensor and lead cable 2 Is value of temperature sensor normal If not replace sensor Piping temperature sensor 10 50 10 kΩ 25 77 5 kΩ 50 122 1 8 kΩ 3 If connection of sensor and value is correct replace outdoor unit PCB 16 HR unit Sub cooling inl...

Page 144: ...l indoor units Refer to CH05 If communication green LED blink of HR unit PCB is abnormal not blinking just on even if communication con dition is normal replace HR unit PCB NB If Indoor units communication cables of HR unit and cables of power 220 V has been changed each other communication parts and indoor will be burnt HR Unit PCB PRHR 2 A HR Unit PCB PRHR 3 A SW02M Dip switch for setup of The f...

Page 145: ...nnection between HR unit and the upgraded 485 modem and check for the red LED on 2 Reset the outdoor unit and the power of HR unit if the red LED of the upgraded 485 modem is on 3 Replace the upgraded 485 modem if the red LED is flashing at the upgraded 485 modem 4 Replace the HR unit PCB if the red LED of the upgraded 485 modem is flashing even after replacing the upgraded 485 modem n Error diagn...

Page 146: ...iring wrong type of EEPROM 3 Defect of the Main PCB of HR Unit Error No Error type Error point Main reasons When fail to communication of EEPROM of HR Unit Communication error of EEPROM of HR Unit 208C HR n Error diagnosis and countermeasure flow chart 1 Check if Dip switch No 5 of SW02E on Slave Main PCB is ON 2 Check the communication connection between Master and Slave Main PCB of HR Unit even ...

Page 147: ...P NO MFL69740701 Copyright 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

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