LG ARWN038GA2 Service Manual
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LG ARWN038GA2 Service Manual

LG ARWN038GA2 Service Manual

Outside unit multi-v water mini series
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See also: Installation Operation & Maintenance
Internal Use Only
http://biz.lgservice.com
System
Outside Unit
R410A
SERVICE MANUAL R410A
MODEL : WATER MINI Series
CAUTION
Before Servicing the units, read the safety precautions in General SVC manual.
Only for authorized service personnel.

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Summary of Contents for LG ARWN038GA2

  • Page 1 Internal Use Only http://biz.lgservice.com System Outside Unit R410A SERVICE MANUAL R410A MODEL : WATER MINI Series CAUTION Before Servicing the units, read the safety precautions in General SVC manual. Only for authorized service personnel.

  • Page 2: Table Of Contents

    External Appearance........................11 Nomenclature ..........................12 Part 2 Outside Units ......................... Part 3 Test Run .......................... Part 4 Trouble Shooting Guide ..................... - 2 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    • There is risk of fire or electric shock. • Improper wiring or installation may cause fire or electric shock. - 3 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 4 LGE are used, fire or explosion may result. R410A R407C - 4 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 • There is risk of fire, electric shock, or product • There is risk of fire, electric shock, explosion, or damage. injury. - 5 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 • To avoid vibration or water leakage. • If the gas leaks and accumulates around the unit, an explosion may result. 90˚ - 6 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 • It may cause failure of appliance or accident. reduce the performance of the air conditioner or damage its parts. - 7 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 • Tear apart and throw away plastic packaging bags so that children may not play with them. If children play with a plastic bag which was not torn apart, they face the risk of suffocation. - 8 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 Do not insert hands or other objects through the air inlet or outlet while the air conditioner is plugged in. • There are sharp and moving parts that could cause personal injury. - 9 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Part 1 General Information

    General Information 1. Model Names ..............11 1.1 Indoor Unit ...............11 2. External Appearance .............11 2.1 Outside Unit.............11 3. Nomenclature..............12 - 10 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Model Names

    1Ø, 208/230V, 60Hz 038GA2 048GA2 053GA2 Heat Pump ARWN 2. External Appearance 2.1 Outside Unit • 1Ø ARWN038GA2 ARWN048GA2 ARWN053GA2 - 11 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: Nomenclature

    Cooling Only or Heat Pump N: Inverter and H/P Indicates that this is Water System Outside Unit using the R410A - 12 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Part 2 Outside Units

    Part 2 Outside Unit - 13 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 Water Mini Series • Function ..................15 - 14 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 3.5 Pressure switch......................23 4. Other control ........................24 4.1 Initial setup .........................24 4.2 Vacuum Mode ......................26 4.3 Black Box Function ....................27 - 15 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Basic Control

    Compressor Set frequency Stop Cooling and heating load Fuzzy Control Inverter linear control as cooling and heating load increasing - 16 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Master And Slave Unit's Eev Control

    The degree of Superheat = Tsuction - Tevaporation Tsuction : temperature at suction pipe sensor (°C/°F) Tevaporation : evaporation temperature equivalent to low pressure (°C/°F) - 17 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: Special Control

    ■ Oil return operation time : 3min for running step ■ Starting condition:every 3hours operate ■ Oil return process ends if compressor protection control starts - 18 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 ■ Oil return operation time : 3min for running step ■ Starting condition:same as cooling mode ■ Oil return process ends if compressor protection control starts - 19 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Stopping Operation

    (Before 15min. : Min. pulse) 4way valve After 60min. After 15min. Hot gas bypass valve (Before 15min. : ON) - 20 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Protection Control

    3sec. ② Ps > 739kPa Normal control ❈ Frequency holding : frequency (or RPM) is not increasing (can decrease) - 21 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 22: Discharge Temperature Control

    15.5A or less 16A or more 25A or more Compressor Current 23/26A or less 23/26A or more 29A or more (Cooling/Heating) - 22 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: Liquid Back Control

    - The state of pressure sensing switch is normally on. It has small electric current from 220V AC. Never touch the connecting terminal with hand nor short two wires directly. - 23 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Other Control

    Heat pump : Display 2 is default value Cooling only : no display Factory setting (25 is normal) Model Type - 24 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 Auto address process is finished. Every indoor unit displays its address on wired remote controller and the 7segment of main PCB is off. - 25 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Vacuum Mode

    Main Lev, SC Lev OPEN IDU Lev OPEN Caution Outside unit operation stops during vacuum mode. Compressor can't operate. - 26 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Black Box Function

    <Save EEP data> in LGMV ■ Saving process : Making Data ➠ Save EEP data ➠ data saving place select ➠ file save - 27 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Test Run

    Part 3 PCB Setting and Test Run - 28 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Part 3 Test Run

    • In case that the outside temperature is low, be sure to supply power 6hours before operation so that the heater is heated(insufficient heating may cause damage of the compressor.) - 29 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 • When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 30 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Dip Switch Setting

    3.1 Location of setting Switch Main PCB SW01B SW02B (DIP S/W) (DIP S/W) 7 - Segment SW02V Auto addressing - 31 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 Normal mode display (If the dip switch is set incorrectly, it is not displayed.) Model type (Water Mini) ■ Mode code Model Code Unit(HP) Powersupply Ref. 1Ø, 208/230V R410A - 32 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 ■ If the dip switch is not set accurately, it can have excessive load on the product operation. Set the dip switch properly. - 33 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 34: Part 4 Trouble Shooting Guide

    Part 4 Trouble Shooting Guide - 34 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 2.1 Compressor ..................37 2.2 Electronic Expansion Valve...............38 2.3 Inverter IPM Checking Method ..............41 2.4 Other ......................42 3. Self-diagnosis function ..............43 - 35 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: The Phenomena From Main Component Failure

    • When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 36 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: 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). - 37 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 38: Electronic Expansion Valve

    Full open% open EEV noise. 1350 pulses - If liquid refrigerant is in EEV, the noise is lower. pulse - 38 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 When the coil part is removed or assembled, be careful not to bend the pipe of the body. A part - 39 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 40 If estimated temperature is very low in comparison with suction temperature which is displayed at remote controller then the valve is not fully closed - 40 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Inverter Ipm Checking Method

    W terminal : black (-) Open 28kΩ ± 10% ✽ Red (+) and black (-) are the measuring terminals of multi tester. - 41 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Other

    LED 01Y turned off (wait 3min after main power OFF), otherwise it may cause electrical shock. - 42 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Self-Diagnosis Function

    Compressor maintenance by outside unit high pressure Outside unit high pressure switch switch Flow rate insufficiency or flow switch trouble of out- side unit - 43 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 44 When the indoor uint control signal is not received from contrller and indoor unit the outside unit inverter controller - 44 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 45 Communication error between main MICOM and sub Communication error between MICOMs MICOM ■ Refer to the troubleshooting guide of service technical manual for each error. - 45 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Troubleshooting Guide

    CN-PIPE2 : Pipe outlet temp sensor CN-PIPE1 : Pipe inlet temp sensor Measure the resistance of outlet pipe temp sensor. - 46 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 ❇ The PCB can differ from model to model. Check from the right source. Checking transmission cable connection status - 47 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 & the unit is stopped automatically. float (High position ➠ Open) Condensate water - 48 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 (Marked as CN-DPUMP) Float switch connector Float switch Housing (CN-FLOAT) [***] Standard of drain pipe head height / slope MAX 450 - 49 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 (-9V~+9V) then of communication terminal between IDU and ODU transmission from outside unit is normal - 50 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 With cableless remote controller: Turn off indoor unit, and then turn on by changing the operation mode. The error will disappear. - 51 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 - Replace the indoor unit PCB, and then make sure to perform Auto addressing and input the address of central control - 52 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 (Notice: The connection of motor connector to PCB should be done under no power supplying to PCB) - 53 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 Check inverter PCB assembly IPM normality Is inverter PCB assembly ➔ Replace inverter PCB assembly normal? Recheck power and installation condition - 54 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 * Inverter PCB & bridge diode wiring each terminal of compressor * Compressor wire connector connection * Measuring input voltage - 55 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 Check inverter PCB assembly IPM normality Is inverter PCB assembly normal? → Replace inverter PCB assembly Recheck power and installation condition - 56 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 Troubleshooting Guide * Measuring input voltage * Inverter PCB & bridge diode wiring - 57 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 Check inverter PCB assembly IPM normality Is inverter PCB assembly normal? ➔ Replace inverter PCB assembly Recheck power and installation condition - 58 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 Troubleshooting Guide * Measuring resistance between each terminal of compressor * Compressor wire connection - 59 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 Is inverter PCB assembly normal? Replace inverter PCB assembly Recheck power and installation condition * Measuring input voltage * Noise filter wiring - 60 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 Check inverter PCB assembly IPM normality Is inverter PCB assembly normal? → Replace inverter PCB assembly Recheck power and installation condition - 61 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 Troubleshooting Guide * Measuring resistance between each * Compressor wire connection terminal of compressor * Measuring input voltage - 62 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 Check another components Is there pipe and operation conditions (strainer etc.) clogging? / Take measures Replace strainer - 63 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 Replace sensor of high pressure value(Is it high actually)? Check indoor unit LEV Check indoor unit PCB Check in/outside installation condition - 64 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 (Notice: it is not full ice forming of strainer, in case that there is installation conditions not at inlet portion but at outlet portion) - 65 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 Is inverter PCB assembly normal? Recheck power and installation condition * Measuring input voltage * LGMV Part * Inverter PCB assembly - 66 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 10C = 362k : 25C= 200k : 50C= 82k : 100C= 18.5k Check the resistance Check the resistance inverter compressor of constant compressor discharge temperature discharge temperature sensor sensor - 67 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 After replacement of Replace corresponding outside unit main PCB pressure sensor is the system normal? High pressure sensor Low pressure sensor - 68 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 : 25C= 10k : 50C= 3.4k Sensor of piping temperature: 10C = 10k : 25C= 5k : 50C= 1.8k - 69 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 130% of outdoor unit same as the data of LGMV? unit capacity at LGMV? Adjust the capacity of indoor and outdoor unit - 70 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 * The method of checking MAIN PCB and inverter compressor PCB (If normal, transmission LED blinks) Transmission connector & LED in MAIN PCB Transmission connector & LED in inverter compressor PCB - 71 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 In case that only transmission PCB is replaced above process is not needed - 72 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 * Inverter EEPROM inserting point EEPROM enlarged picture * Right inserting direction of inverter EEPROM ❊ Note : Replace after power off - 73 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? → Replace inverter PCB assembly Recheck power and installation condition - 74 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 Inverter PCB assembly/Wiring power to inverter PCB on Noise filter Inverter PCB assembly power Noise filter power connection connection - 75 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 Replace inverter PCB assembly assembly normal? Recheck power and installing condition Measuring input voltage Inverter PCB & Bridge Diode wiring - 76 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 Reset after checking EEPROM assemble condition condition normal? Replace EEPROM with 24C16 Is EEPROM 24C16? Recheck power and installation condition - 77 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ - 78 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 If the same error is occurred in mode, is the same error near future replace 4way valve occurred again? Replace 4 way valve***** - 79 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 ➃ If there is a unit in which the difference is not increased then the 4way valve of that unit is defective - 80 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 APRIL, 2013 P/NO : MFL67101202...

This manual is also suitable for:

Arwn048ga2Arwn053ga2

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