LG MULTIV III Service Manual
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LG MULTIV III Service Manual

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Heat Recovery Unit
SERVICE MANUAL
MODEL : PRHR041/PRHR041A
PRHR031/PRHR031A
PRHR021/PRHR021A
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Internal Use Only
http://biz.lgservice.com
R410A

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Summary of Contents for LG MULTIV III

  • Page 1 Internal Use Only http://biz.lgservice.com Heat Recovery Unit R410A SERVICE MANUAL MODEL : PRHR041/PRHR041A PRHR031/PRHR031A PRHR021/PRHR021A CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.

  • Page 2: Table Of Contents

    External Appearance ........................7 Nomenclature ..........................8 Part 2 HR Units ......................9 Part 3 PCB Setting....................19 Part 4 Trouble shooting guide................35 - 2 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    • There is risk of fire, electric shock, explosion, or • There is risk of fire, electric shock, explosion, or injury. injury. - 3 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 4 • Installation within cell such as meeting room etc, may disturb business due to noise. - 4 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 5: Part 1 General Information

    Part 1 General Information 1. Model Names ..............6 2. External Appearance............7 3. Nomenclature..............8 - 5 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 6: Model Names

    3 branches 4 branches 1Ø, 220-240V, 50Hz / 1Ø, 220V, 60Hz PRHR021 PRHR031 PRHR041 1Ø, 208/230V, 60Hz PRHR021A PRHR031A PRHR041A - 6 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: External Appearance

    External Appearance 2. External Appearance 2.1 HR Unit PRHR021/PRHR021A PRHR031/PRHR031A PRHR041/PRHR041A 2 branches 3 branches 4 branches - 7 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Nomenclature

    03 : For 3 branches 04 : For 4 branches Indicates that this is System HR Unit using the R410A - 8 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Part 2 Hr Units

    Part 2 HR Units - 9 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 2. Parts Functions ......................12 3. Dimensions ........................13 4. Piping Diagrams ......................14 5. Wiring Diagrams ......................15 6. Electric Characteristics ....................16 7. Functions ........................17 - 10 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Specifications

    1. Voltage range : Units are suitable for sue on electrical systems where voltage supplied to units terminals is not below or above listed range limits. 2. Maximum allowable voltage unbalance between phases is 2% - 11 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: Parts Functions

    High pressure gas pipe Subcooling EEV Balancing valve Gas pipe Liquid pipe2 Liquid bypass valve Solenoid assembly 1 Solenoid assembly 2 - 12 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Dimensions

    Dimensions Dimensions 1. HR Units - 13 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: 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 - 14 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Wiring Diagrams

    Setting, the address of indoor_10(When manual address) SW04M Setting, the address of indoor_1(When manual address) SW05M Setting, HR unit number - 15 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Electric Characteristics

    (Next lower standard fuse rating. Minimum 15A) 4. Select wire size based on the MCA. 5. Instead of fuse, use Circuit Breaker. - 16 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Functions

    Close Close Stop or Heating mode : ventilation Low pressure Keep Close Timer = 0 gas valve ➠ Close - 17 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 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 - 18 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Part 3 Pcb Setting

    Part 3 PCB Setting - 19 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 8. Method of checking the pipe detection result at outdoor unit ......33 9. Setting method of Master indoor unit in zoning ..........34 - 20 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Unit Pcb

    SW01M Turn the dip switch of the zoning Zoning branch on. control EX) Branch 1,2 are zoning control. SW01M - 21 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 • If you want to use a PRHR041/PRHR041A 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. - 22 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 321(12-5/8) O.D15.88(5/8) I.D12.7(1/2) I.D22.2(7/8) I.D22.2(7/8) 332(13-1/16) I.D28.58(1-1/8) 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) 80(3-5/32) 70(2-3/4) 110(4-11/32) 110(4-11/32) - 23 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 Increase in the digit of 10 of valve address SW04M Increase in the last digit of valve address SW04M - 24 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 SW03M SW04M Increase in the last digit of valve address SW04M SW05M Manual addressing of zoning indoor units SW05M - 25 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Method For Addressing Of Indoor And Hr Unit

    Ex) In case of installing four HR units : 04 9) Operated after 88 is displayed on 7-SEG of the outdoor unit main PCB. - 26 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 7. During 5 minutes after pipe detection is completed, do not turn off the main unit PCB to save the result of pipe detection automatically. - 27 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Flow Chart For Auto-Addressing Of Indoor And Hr Unit

    Display of 01, 02, ..., 15 means connection of 15 indoor units and auto addressing is completed normally. - 28 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 ❇ 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. - 29 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 Turn No.6 of SW03M of outdoor unit PCB Completion of manual pipe detection Reset the power of outdoor unit PCB. - 30 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Example Of Manual Valve Addressing(Non-Zoning Setting)

    (The valves does not work if the address numbers are same.) - 31 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: 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.) - 32 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Example Of Checking Valve Address

    The auto addressing number of indoor unit (digit of 1) The auto addressing number of indoor unit (digit of 10) - 33 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 34: Setting Method Of Master Indoor Unit In Zoning

    • 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. - 34 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Part 4 Trouble Shooting Guide

    Part 4 Trouble shooting guide - 35 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 Trouble shooting guide Self-diagnosis function ..............37 - 36 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 Communication error Failing to receive HR unit signal at outdoor unit C : HR unit # : HR unit Number - 37 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 [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' - 38 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 #16 HR unit Sub-cooling inlet pipe temperature sensor error 200 ➔ C16 (Repeat) C: HR unit #: HR unit Nuber - 39 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 40 [NB] If Indoor units/communication cables of HR unit and cables of power 220V has been changed each other, communication parts and indoor will be burnt HR Unit PCB Green LED blinking: communication is normal - 40 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 AUGUST, 2011 P/NO : MFL67400003...

This manual is also suitable for:

Multiv prhr041Multiv prhr041aMultiv prhr031Multiv prhr031aMultiv prhr021Multiv prhr021a

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