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LG MULTI V 5 Manual Book
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LG MULTI V 5 Manual Book

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Internal User Only
2017
Trouble Shooting
Guide Book
Visual Elements Logo
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Summary of Contents for LG MULTI V 5

  • Page 1 Internal User Only 2017 Trouble Shooting Guide Book Visual Elements Logo Life’s Good...
  • Page 2 Navigation Bar The different category are shown at the side. So, you can go directly to the index page with a single click. CONTACT US The satisfaction of our customers is very importance to us. This PDF will help you quickly find the informa- tion you are looking for and you can submit your comments, concerns or suggestions via the feedback link below.

  • Page 3: Table Of Contents

    6. Check Valve (Outdoor EEV Check Valve) 169 3. P-H Diagram_R410A 7. Check Valve (Oil Separator) 4. P-H Diagram_R134a 8. Outdoor Fan & Fan Motor 9. Temperature Sensor Ⅱ. Multi V 5 Introduction 10. Pressure(High/Low) Sensor 11. Humidity Sensor 12. Pressure Switch 1. Nomenclature 13. Main PCB 2.

  • Page 4: Ⅰ. Basic Part

    Ⅰ. Basic Part 1. Unit Conversion 2. Temperature Vs. Pressure of Ref. 3. P-H Diagram_R410A 4. P-H Diagram_R134a...

  • Page 5: Unit Conversion

    1. Unit Conversion 2. Temperature Vs. Pressure of Ref. Power Saturation temperature vs. saturation pressure table for each refrigerant Absolute pressure = Guage pressure(kPa) + 101.325(kPa) 　 kcal/h Btu/h (US) RT (Japan) RT Nominal HP kPa : kgf/㎠ x 101.97 kcal/h 3.986 0.0003306...
  • Page 6 Saturation temperature vs. saturation pressure table for each refrigerant R134a Temp. Pressure ℃ kgf/cm 5.58 0.06 31.92 0.33 63.12 0.64 99.79 1.02 142.54 1.45 192.00 1.96 248.85 2.54 313.79 3.20 387.53 3.95 470.81 4.80 564.42 5.76 669.11 6.82 785.74 8.01 915.13 9.33 1261.00...

  • Page 7: P-H Diagram_R410A

    3. P-H Diagram_R410A R410A _TROUBLE SHOOTING GUIDE BOOK...

  • Page 8: P-H Diagram_R134A

    4. P-H Diagram_R134a _TROUBLE SHOOTING GUIDE BOOK...

  • Page 9: Ⅱ. Multi V 5 Introduction

    Ⅱ. Multi V 5 Introduction 1. Nomenclature 2. Line Up / Capacity 3. Piping Diagrams 4. Wiring Diagrams...

  • Page 10: Nomenclature

    1. Nomenclature Multi V 5 Indoor Unit Multi V 5 Outdoor Unit Model Generation Model Generation Combinations of functions E : High Efficiency A:Basic function L:Neo Plasma(Wall Mounted) C:Plasma(Ceiling Cassette) Air Discharge Type T : Top Discharge G: Low Static...

  • Page 11: Line Up / Capacity

    2. Line Up / Capacity Multi V Hydro Kit Multi V 5 Indoor Unit ■ Standard Model ARN H G K2 Capacity(Btu/h(kW)) Chassis Category Name (1.6) (2.2) (2.8) (3.6) (4.5) (5.6) (6.2) (7.1) (8.2) (9.0) (10.6) (12.3) (14.1) (15.8) (22.4) (28.0)
  • Page 12 실외기 Multi V 5 Outdoor Unit 실외기 Multi V 5 Combination of Outdoor Unit CHASSIS Model Name Capacity(kW) Model Module(HP) Number Model Name ARUM080LTE5 22.4 of Units ARUM100LTE5 28.0 ARUM120LTE5 33.6 ARUM080LTE5 ARUM100LTE5 ARUM140LTE5 39.2 ARUM120LTE5 ARUM160LTE5 44.8 ARUM140LTE5 ARUM180LTE5 50.4...

  • Page 13: Piping Diagrams

    Multi V 5 Outdoor Units 3. Piping Diagrams 3. Piping Diagrams 3.1 8 / 10 / 12 / 14 / 16 HP (1 Comp) HR Unit 8 / 10 / 12 / 14 / 16 HP (1 Comp) 3.1.1 Heat Recovery System...
  • Page 14 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Heating Operation ■ Oil Return/ Defrost Operation Heating Operation Oil Return/ Defrost Operation High Temperature High Pressure Vapor High Temperature High Pressure Vapor...
  • Page 15 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Cooling-based Simultaneous Operation ■ Heating-based Simultaneous Operation Cooling-based Simultaneous Operation Heating-based Simultaneous Operation High Temperature High Pressure Vapor High Temperature High Pressure Vapor...
  • Page 16 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Balanced Simultaneous Operation ■ Upper HEX Defrost Operation Balanced Simultaneous Operation Upper HEX Defrost Operation High Temperature High Pressure Vapor High Temperature High Pressure Vapor...
  • Page 17 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Low HEX Defrost Operation 3.1.2 Heat Pump System Heat Pump System Low HEX Defrost Operation ■ Cooling Operation Cooling Operation High Temperature High Pressure Vapor...
  • Page 18 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Heating Operation Heating Operation ■ Oil Return/ Defrost Operation Oil Return/ Defrost Operation High Temperature High Pressure Vapor High Temperature High Pressure Vapor...
  • Page 19 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Upper HEX Defrost Operation ■ Low HEX Defrost Operation Low HEX Defrost Operation Upper HEX Defrost Operation High Temperature High Pressure Vapor High Temperature High Pressure Vapor...
  • Page 20 Multi V 5 Outdoor Units Multi V 5 Outdoor Units 3. Piping Diagrams 3. Piping Diagrams 3.2 18 / 20 / 22 / 24 / 26HP (2 Comp) ■ Heating Operation 18 / 20 / 22 / 24 / 26HP (2 Comp) Heating Operation 3.2.1 Heat Recovery System...
  • Page 21 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Oil Return/ Defrost Operation ■ Cooling-based Simultaneous Operation Oil Return/ Defrost Operation Cooling-based Simultaneous Operation High Temperature High Pressure Vapor High Temperature High Pressure Vapor...
  • Page 22 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Heating-based Simultaneous Operation ■ Balanced Simultaneous Operation Heating-based Simultaneous Operation Balanced Simultaneous Operation High Temperature High Pressure Vapor High Temperature High Pressure Vapor...
  • Page 23 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Upper HEX Defrost Operation ■ Low HEX Defrost Operation Upper HEX Defrost Operation Low HEX Defrost Operation High Temperature High Pressure Vapor High Temperature High Pressure Vapor...
  • Page 24 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Heating Operation 3.2.2 Heat Pump System Heat Pump System Heating Operation ■ Cooling Operation Cooling Operation High Temperature High Pressure Vapor High Temperature High Pressure Vapor...
  • Page 25 Multi V 5 Multi V 5 Outdoor Units Outdoor Units 3. Piping Diagrams 3. Piping Diagrams ■ Oil Return/ Defrost Operation ■ Upper HEX Defrost Operation Oil Return/ Defrost Operation Upper HEX Defrost Operation High Temperature High Pressure Vapor High Temperature High Pressure Liquid...
  • Page 26 Ⓓ : To be controlled the pressure between high and low pressure pipe during operation switching Pressure Switch SVC Valve Strainer - 59 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes _TROUBLE SHOOTING GUIDE BOOK - 59 - Copyright ©2017 LG Electronics.
  • Page 27 Hydro Kit 2. High Temperature 1. Medium Temperature Hydro Kit (For High Temperature) R134a CYCLE Water Tank Outdoor Unit Water Flow Switch SIDE Outlet Liquid Water Inlet Strainer Check Side Strainer Strainer Valve Bypass Flow Valve Switch Water Outlet Side LIQUID Water Strainer...

  • Page 28: Wiring Diagrams

    Multi V 5 Multi V 5 4. Wiring Diagrams Outdoor Units Outdoor Units 4. Wiring Diagrams 4. Wiring Diagrams 4.2 14 / 16 HP (UXB, 1 Comp) 4.1 8 / 10 / 12 HP (UXA, 1 Comp) 4.1 8 / 10 / 12 HP (UXA, 1 Comp)
  • Page 29 Setting, the Address of indoor_10(When Manual Address) SW04M Setting, the Address of indoor_1(When Manual Address) SW05M Setting, HR Unit Number - 60 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes _TROUBLE SHOOTING GUIDE BOOK...
  • Page 30 Hydro Kit 1. Medium Temperature 2. High Temperature _TROUBLE SHOOTING GUIDE BOOK...
  • Page 31 Ⅲ. Trouble Shooting Guide Checking Point Self-Diagnosis Function Checking Method for Key Components...

  • Page 32: Checking Point

    Ⅲ. Trouble Shooting Guide Checking Point 1. LGMV 2. Lack of Cooling 3. Lack of Heating 4. Check The Amount of Refrigerant 5. Cycle Changes by Amount of Refrigerant...

  • Page 33: Lgmv

    1. LGMV 2. Lack of Cooling 2.1 Not reach target low pressure Checking Item Symptom Judgment Countermeasure Check the indoor EEV opening pulse. When the opening pulse is small or closed, please lower the degree of superheat of the corresponding indoor unit Check the indoor unit EEV Inlet temp.

  • Page 34: Lack Of Heating

    3. Lack of Heating 2.2 Not reach target low pressure 3.1 Reach target high pressure Checking Item Symptom Judgment Countermeasure Checking Item Symptom Judgment Countermeasure Not reach the target Refrigerant overcharging Check the amount of refrigerant low pressure under Bypass by defec- Recheck the load design, Check the Check the outdoor valve full / partial / single...

  • Page 35: Check The Amount Of Refrigerant

    4. Check The Amount of Refrigerant 3.2 Not reach target high pressure 4.1 Cooling Checking Item Symptom Judgment Countermeasure Item Refrigerant shortage Refrigerant overcharging Not reach the target low • EEV open Bypass by defective EEV close pressure under full / Check the outdoor valve Indoor unit EEV (approx.
  • Page 36 4.2 Heating 4.3 Normal cycle Item Refrigerant shortage Refrigerant overcharging EEV close EEV open Indoor unit EEV (approx. 200 pls or less) (approx. 1350 pls) The degree of subcooling (@ indoor unit) below 3 ℃ above 7 ℃ (Condense Temp. - Pipein Temp.) Low pressure below target low pressure...

  • Page 37: Cycle Changes By Amount Of Refrigerant

    5. Cycle Changes by amount of refrigerant 20170217 Trouble Shooting Guide Book_Multi5_신규추가 4.4 Abnormal cycle (Refrigerant Overcharging / Shortage) 5.1 Cooling cycle 5. Cycle Changes by amount of refrigerant 5.1.1 A cycle changes by refrigerant overcharging 5.1 Cooling cycle When overcharging a refrigerant more than necessary, an extra refrigerant will be stored in con- 5.1.1 A cycle changes by refrigerant overcharging densing HEX and liquid pipe because of high density.

  • Page 38: Self-Diagnosis Function

    20170217 Trouble Shooting Guide Book_Multi5_신규추가 5.2 Heating cycle 5.2.1 A cycle changes by refrigerant overcharging 5.2 Heating cycle When overcharging a refrigerant more than necessary, an extra refrigerant will be stored in con- Ⅲ. Trouble Shooting Guide densing HEX and liquid pipe because of high density. Overcharged refrigerant can make changing 5.2.1 A cycle changes by refrigerant overcharging the cycle as below.

  • Page 39: Error Code Display

    1. Error Code Display Self-Diagnosis Function Display Title Cause of Error Error Indicator Hydro KitIndoor unit Inlet and Outlet pipe Pipe temperature sensor is open or short - This function indicates types of failure in self-diagnosis and occurrence of failure for air condition. Temperature sensor Error - Error mark is displayed on display window of indoor units and wired remote controller, and 7-segment LED of outdoor unit control board as Hydro Kit Indoor unit Inlet pipe Temperature...
  • Page 40 Display Title Cause of Error Display Title Cause of Error Outdoor Unit Inverter Compressor2 Discharge Outdoor Unit Inverter Compressor2 Discharge Tem- 1 0 6 Outdoor Unit Fan IPM Fault Error Instant Over Current at Outdoor Unit Fan IPM Temperature Sensor Fault perature Sensor open or short Outdoor Unit Fan DC Link Low Voltage Outdoor Unit Fan DC Link Input Voltage is under...

  • Page 41: Error Code Check

    ❇ Check from the right source. Checking communication cable connection status - 29 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 101 - Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 42 (High position Open) float Condensate water - 102 - Copyright ©2017 LG Electronics. Inc. All right reserved. - 103 - LGE Internal Use Only Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 • Local IDU Modem Error No. Error Type Error Point Main Reasons Connector to main PCB Communication error The indoor unit did not re- 1. IDU PCB or ODU PCB defect between IDU and ceive the signal from ODU For 9600 bps comm., the red LED will always turn on. 2.
  • Page 44 WARNING • The connection of motor connector to PCB should be done under no power supplying to PCB. - 106 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 35 - Copyright ©2013 LG Electronics.
  • Page 45 • Replace the water pump. • Also, check the water quality if there are particles that can yield locking at the shaft of the water pump. - 36 - Copyright ©2013 LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Copyright ©2013 LG Electronics.
  • Page 46 Error status: the green and red LED blink alternately. Measuring the resistance value of the temperature sensor Water inlet temperature sensor - 34 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes _TROUBLE SHOOTING GUIDE BOOK...
  • Page 47 Recheck power and installation condition - 108 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 109 - Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 48 Recheck power and installation condition - 110 - - 111 - Copyright ©2017 LG Electronics. Inc. All right reserved. Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only LGE Internal Use Only Only for training and service purposes...
  • Page 49 → Replace Inverter PCB assembly if abnormality found. normal? Recheck power and installation condition - 112 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 113 - Copyright ©2017 LG Electronics. Inc. All right reserved.

  • Page 50: Compressor

    LGMV similar as Replace high pressure sensor at manifold gauge? - 115 - Copyright ©2017 LG Electronics. Inc. All right reserved. Check pipe is blocked or LGE Internal Use Only not and take measure Only for training and service purposes - 114 - Copyright ©2017 LG Electronics.
  • Page 51 Is Inverter PCB assembly normal? → Replace Inverter PCB assembly Recheck power and installation condition - 116 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 117 - Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 52 Is Inverter PCB assembly normal? → Replace Inverter PCB assembly Recheck power and installation condition - 118 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 119 - Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 53 (strainer etc.) clogging? / Take measures Replace strainer - 121 - Copyright ©2017 LG Electronics. Inc. All right reserved. - 120 - LGE Internal Use Only Copyright ©2017 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 54 - 123 - - 122 - Copyright ©2017 LG Electronics. Inc. All right reserved. Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only LGE Internal Use Only Only for training and service purposes...
  • Page 55 Note: Standard values of resistance of sensors at different temperatures (5% variation) 10°C = 362kΩ : 25°C= 200kΩ : 50°C= 82kΩ : 100°C= 18.5kΩ - 124 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 3. Main PCB Fault Slave3 1544 Fault open or short - 127 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 126 - Only for training and service purposes Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 57 ➠ ➠ - 128 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 129 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only...
  • Page 58 In case that only communication PCB is replaced above process is not needed - 130 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 131 - Only for training and service purposes Copyright ©2017 LG Electronics.
  • Page 59 Communication LED Communication Communication Communication - 133 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 132 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only...
  • Page 60 * Right inserting direction of inverter EEPROM Slave3 ❊ Note : Replace after power off - 134 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes _TROUBLE SHOOTING GUIDE BOOK...
  • Page 61 Recheck Power and Installation Condition n Check Inverter PCB Screw Connection Condition - 136 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes ❈ Check screw connection condition - 135 - Copyright ©2017 LG Electronics.
  • Page 62 ❈ When it has heavy snowfall, remove from product and then operate. - 137 - - 138 - Copyright ©2017 LG Electronics. Inc. All right reserved. Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only LGE Internal Use Only...
  • Page 63 Check DC input power 15V on Inverter PCB. - 140 - - 139 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 Same direction both socket hole and EEPROM hole Check the connetion condition - 142 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 141 - Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 65 Same direction both socket hole and EEPROM hole - 144 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only ❈ Note : Replace after power off Only for training and service purposes - 143 - Copyright ©2017 LG Electronics.
  • Page 66 Fan Motor Wire connection Communication Connector - 145 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 146 - Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 67 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 - 149 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 * The Method of checking Main PCB and External PCB (If normal, communication LED blinks) * Measuring input voltage * Noise filter wiring R(L1) S(L2) T(L3) - 150 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes _TROUBLE SHOOTING GUIDE BOOK...
  • Page 69 4way valve occurred again? Replace 4 way valve***** - 151 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 152 - Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 70 (Master + Slave1 + Slave2) ¿ Close all the SVC valves of high / low pressure - 154 - Copyright ©2017 LG Electronics. Inc. All right reserved. ¡ Operate system LGE Internal Use Only Only for training and service purposes ¬...
  • Page 71 Installation Condition n Check Fan PCB Screw Connection Condition - 156 - Check Screw Connection Condition Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 155 - Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 72 5) If indoor unit has not been connected to #1 valve of HR unit, set pipes of HR unit manually** Copyright ©2017 LG Electronics. Inc. All right reserved. 6) If it is not applied as above, set pipes of HR unit as manual...
  • Page 73 The function of HR unit) addressing) SW03M SW04M - 160 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 161 - Copyright ©2017 LG Electronics. Inc. All right reserved.
  • Page 74 Error No. Error Type Error Point Main Reasons Check address of All IDU's address 1. Communication Wiring defect (Central con- Is central control addressing (Duplication & Omission of IDU address) normal? troller - ODU) Abnormal - All IDUs should have unique central control address Network error of 2.

  • Page 75: Eev

    Ⅲ. Trouble Shooting Guide Checking Method for Key Components 1. The Phenomena from Main Component Failure 150 2. Compressor 3. EEV 4. Solenoid Valve 5. 4Way Valve 6. Check Valve (Outdoor EEV Check Valve) 7. Check Valve (Oil Separator) 8. Outdoor Fan & Fan Motor 9.

  • Page 76: The Phenomena From Main Component Failure

    · Defective oil return valve · Oil return piping blocked · Defective VI EEV - 84 - Copyright ©2017 LG Electronics. Inc. All right reserved. · Defective oil balancing valve LGE Internal Use Only Only for training and service purposes ·...
  • Page 77 2.3 Checking Method (Flow Chart) 2.4 Process of Replacing the Compressor Please follow the below process when you replace the compressor. Checking start · Before replacing the compressor, check whether the failure of the compressor. · Change the oil for compressor after replacing the compressor for 2~3 times. 1.
  • Page 78 2.5 Precautions of Replacement 2.7 Compressor Specification 1. Be sure to use the compressor suitable for the model The specification of compressor being adapted to Multi V is below. 2. Be careful not to damage the pipe When the compressor is not working, please check the compressor referring to the below specification. 3.
  • Page 79 3. EEV ■ Heating 3.1 Failure Judge Method 1. Main EEV ■ Cooling 1) Basic control : Suction the degree of superheat control 2) Failure phenomenon 1. Main EEV ① Upper EEV open failure 1) Basic control Excessive drop of low pressure, Upper and lower heat exchanger temperature difference 10 ℃ or - Variable path mode : Upper EEV Full Close / Lower EEV Full Open more - Low temperature cooling mode : Upper EEV Full Open / Lower EEV Close...
  • Page 80 ■ Physical Failure Judge Method 3.2 Checking Method (Flow Chart) 2-1. EEV 불량 판단 _ 물리적 불량 판단 방법 LGE Internal Use Only 1. Main PCB reset to initialize EEV ■ Outdoor Unit EEV : Full Open (1,950 pls) → Full Close (1,950 pls + 200 pls) → Open (32 pls - 4Way valve on) or Open (1 950 pls - 4Way valve off) ①...
  • Page 81 ■ VI EEV ■ Sub Cooling EEV Checking start Checking start There is a temperature Powered up for the Power is normally difference between front first time, feel the initial Replace PCB supplied to the VI EEV? and rear of the sub cooling vibration? EEV during normal cooling mode?(EEV Open...
  • Page 82 4. Solenoid Valve Check that the output signal of the control board matches the operation of the solenoid valve. 3.3 Precautions of Replacement 4.1 Variable Path Valve 1. EEV should be judged correctly and replaced 2. Replaced EEV should be returned for cause analysis 3.
  • Page 83 ■ Checking Method (Flow Chart) 4.2 Sub Cooling Bypass Valve 1. When the compressor starts, the sub cooling bypass valve is ON for minute. At this time, check whether Checking start the noise or pipe vibration occurs In solenoid valve 2.
  • Page 84 4.3 Oil Return Valve 4.4 Hot gas Bypass Valve for Continuous Heating 1. It is located at the bottom of the accumulator and operates after the compressor running to supply oil to 1. Defrost operation eliminates ice attached on heat exchanger, recovering performance of heat exchanger. the compressor.

  • Page 85: Check Valve (Outdoor Eev Check Valve)

    In normal condition of Restart (after operating the self- - 69 - compressor discharging Copyright ©2011 LG Electronics. Inc. All right reserved. recovery logic of 4 way valve in LGE Internal Use Only Only for training and service purposes temperature, there is the...

  • Page 86: Outdoor Fan & Fan Motor

    8. Outdoor Fan & Fan Motor 8.1 Outdoor Fan 8.3 Checking Method (Flow Chart) 1. The outdoor fan is controlled by the inverter motor which can control the number of rotations. Checking start 2. The outdoor fan is controlled by the high/low pressure of the outdoor unit after the operation of compressor.

  • Page 87: Temperature Sensor

    This does not mean breakdown of the unit, the fan will start operating if it reaches the set point. - 67 - Copyright ©2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes - 67 - Copyright ©2011 LG Electronics.

  • Page 88: Humidity Sensor

    11. Humidity Sensor ■ Checking Method (Flow Chart) If the humidity sensor has problem such as sensor open or short, no error display is shown at outdoor unit. Normally LGMV shows humidity ratio such as below display box of LGMV. Checking start However, if the humidity sensor open/short occurred, it displays as "0".

  • Page 89: Pressure Switch

    12. Pressure Switch 13. Main PCB 13.1 Failure Judge Method 15. Main PCBA Checking start 1.1 불량 판단 방법 1. Error code check 1) 에러 코드 확인 Error Code Error diagnosis ·Check restart after power reset 에러 코드 ·Check main PCB power supply. In the pressure condition that the pressure CH50...

  • Page 90: External Pcb

    14. External PCB 13.2 Failure Cause 14.1 Failure Judge Method 1. Error code check 1. High voltage (T-N more than 484V, N phase wiring fault) → CH50 2. Rainwater inflow by Control box / Front Panel / Service port open, Control box screw loosening Error Code Error diagnosis 16.

  • Page 91: Inverter Pcb

    15. Inverter PCB 17. Inverter PCBA 14.2 Failure Cause 15.1 Failure Judge Method 1.1 불량 판단 방법 1. Error code check 1. High voltage (T-N more than 484V, N phase wiring fault) → CH50 2. Rainwater inflow by Control box / Front Panel / Service port open, Control box screw loosening Error Code Error diagnosis 3.

  • Page 92: Fan Pcb

    16. Fan PCB 15.2 Failure Cause 16.1 Failure Judge Method 18. Fan PCBA 1. Error code check 1. High voltage (T-N more than 484V, N phase wiring fault) → CH50 2. Rainwater inflow by Control box / Front Panel / Service port open, Control box screw loosening Error Code Error diagnosis 1.1 불량...

  • Page 93: Communication Pcb

    17. Communication PCB 16.2 Failure Cause 17.1 Failure Judge Method 1. Error code check 1. High voltage (T-N more than 484V, N phase wiring fault) → CH50 2. Rainwater inflow by Control box / Front Panel / Service port open, Control box screw loosening Error Code Error diagnosis 3.

  • Page 94: Phase Bridge Diode

    18. Phase Bridge Diode 19. Inverter IGBT 18.1 Phase Bridge Diode Checking Method 19.1 Inverter IGBT Checking Method 인버터 IGBTM 검사 방법 Internal circuit diagram Appearance Internal circuit diagram Appearance 1. Wait until Comp PCB DC voltage gets discharged, after the main power switch off. 2.

  • Page 95: Fan Ipm

    20. Fan IPM 20.1 Fan IPM Checking Method 팬 IPM 검사 방법 <UXA 샤시> <UXB 샤시> U,V,W U,V,W DC_Link Connector Connector DC_Link Connector Connector P Terminal N Terminal P Terminal N Terminal U Terminal U Terminal W Terminal W Terminal V Terminal V Terminal 1.

  • Page 96: Central Controller Pc Status

    21. Central Controller PC Status ■ Network Environment Checking Checking Item Error diagnosis Error diagnosis · Check network setting PC Network Setting · Check LAN cable Case 1. The ACP directly connect with PC through a cross cable. But, you cannot access the ACP ·...
  • Page 97 2. Countermeasure 21.2. PC Software 2.1 If you using JAVA7, you can solve the problem through how to set the security level to "medium" ■ Checking Method (Flow Chart) on the [security] tab. [Start Menu -> All Programs -> JAVA Click -> Configure Java-click] But if you ever become a concern about security, we recommend that ACP's IP add to excep- tions listed sites.

  • Page 98: App. Service & Replace Method Of Control Box, Inverter Pcb

    1. Apply thermal grease at heat sink if needed. 2. Carefully reconnect the wires with out interchanging the locations. - 107 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes _TROUBLE SHOOTING GUIDE BOOK...

  • Page 99: Generation 4 Features

    * Gen 4 or Higher outdoor units : Multi V 5, Multi V IV or Multi V Water IV with Gen 4 or Higher software (see table below for Gen 4 or higher serial numbers) or Multi V S. Fd 8 All IDU operation (Cooling) ●...
  • Page 100 Model Type Model Type Mode Display Function Selection Content Page Mode Display Function Selection Content Page Heat Heat Heat Heat Recovery Pump Recovery Pump FN 1 Cool & Heat Selector ● Id 1 EEV Pulse of Non-Operating IDU in Heating ●...

  • Page 101: Fdd Mode

    3. FDD Mode 3.1 FDD Check List 3.2 FDD Code Display ■ Please check the following. Code Display Cause 130% more than outdoor unit rated capacity or 80% less than outdoor unit rated capacity 1. Automatic address setting has been preceded by a test drive will proceed on the premise. After installation, auto address must be checked because it is related the number of Installation System Unstable Error Temperature Range Error...
  • Page 102 2. Please the wired remote control to set the main unit. 3. During Indoor unit operating, be careful not to be Thermo off. - 35 - Copyright ©2017 LG Electronics. Inc. All right reserved. _TROUBLE SHOOTING GUIDE BOOK 4. If The Outdoor unit occurred frost when Heating automatic refrigerant filling,...
  • Page 103 LGE Internal ITR (Cooling / Heating / Automatic) Use Only 3.4 Automatic ITR (Cooling / Heating) WARNING · When perform the leakage test and air purge, please use a vacuum pump or an inert gas. (nitrogen) ITR (Cooling / Heating / Automatic) It is a function to get information about amount of refrigerant and EEV status in IDU, ODU if normal or not.
  • Page 104 LGE Internal ITR (Cooling / Heating / Automatic) ■ The Display of Results 2. Heating Use Only • If the system is in operation before entering the heating test operation, "IDU / STOP" is displayed, Judgment Code Display then the indoor unit is turned off and the FDD operation is entered. please enter the total amount of refrigerant accurately before entering mode.
  • Page 105 ■ ITR Result Report 3.5 All IDU operation (Cooling / Heating) It is a function to continuously operate in cooling / heating for one hour. ■ Setting the function Function All IDU operation (Cooling) Fd 8 All IDU operation (Heating) Fd 9 ■...

  • Page 106: Function Mode

    4. Function Mode ■ Detailed information 4.1 Cool & Heat selector • This function is used with heat pump only. It is a function to control the cooling / heating limit through the switch of cool & heat selector and ODU •...
  • Page 107 ■ Detailed information 4.2 High Static Pressure Compensation • This function is used with heat pump and heat recovery. This function secures the air flow rate of ODU, in case the static pressure has been applied like using duct • All modes of operation involving compressor operation are a change in the setting impact. at fan discharge of ODU.
  • Page 108 • Cooling mode is a change in the setting impact. operating conditions in the evening while the outdoor unit is operating in the cooling mode. • Multi V 5 continuously monitors the building's cooling demand. On a rolling 24 hour basis, the peak ■ Setting the function cooling demand is maintained and an internal timer begins counting hours since the peak demand was set.

  • Page 109: Fn 4 Overall Defrost

    • Schematic Diagram 4.4 Overall Defrost 1) Overall Defrost It is a function to select the overall or partial defrost when the defrost is in operation. ■ Setting the function Function Option Overall Defrost Fn 4 on, oFF 2) Partial Defrost (Heat Pump) ■...
  • Page 110 4.5 ODU Addressing 4.6 Snow Removal & Rapid Defrost It is the outdoor unit address setting function for outdoor unit when central controller is installed. It is a function to prevent accumulation of snow in the snowy area or to judgment the fast defrost in the humid area.
  • Page 111 4.7 Airflow Adjusting for IDU 4.8 Target Pressure Adjusting It is the function to cope with the overload by changing air flow in the room to the low air flow when the It is a function to change the target pressure of ODU according to field installation conditions (ex. pressure compressor Hz is the maximum but the high pressure is low.

  • Page 112: Fn 9 Low Ambient Kit

    4.9 Low Ambient Kit 4.10 High Efficiency Mode It is a function to Informs the Multi V microprocessor controller the low ambient kit is installed. High efficiency mode refers to increasing the compressor capability to cool at high ambient temperatures. This function automatically lowers the target low pressure as the outdoor ambient temperature rises while the outdoor unit operates in cooling mode (i.e.

  • Page 113: Fn 12 Compressor Max. Frequency Limit

    4.11 Auto Dust Removal Mode 4.12 Compressor Max. Frequency Limit This function is able to improve the heat exchange efficiency to maintain clean state on heat exchanger of It is a function to limit the maximum speed (frequency) of inverter compressor. ODU.
  • Page 114 4.13 ODU Fan Max. RPM Limit 4.14 Smart Load Control It is a function to limit the maximum RPM of ODU. Smart Load Control function enables comprehensive understanding of environmental conditions in order to optimize energy efficiency. This technology allows active control of discharge refrigerant temperature which eventually increases the efficiency for average outdoor unit in comparison to the previous models.
  • Page 115 ■ Detailed information App. The Logic of Dual Sensing SLC (Smart Load Control) • This function is used with heat pump and heat recovery. • Dual Sensing SLC is controlled by 3 factors. (in case of cooling operation) • Heating, Cooling and Dry modes are a change in the setting impact. : Outdoor temperature.
  • Page 116 - When used heating operation in case of high humidity condition, deforest will be delayed because target high/low pressure will be changed. • Activation function by using humidity sensor (Option "on") Multi V Ⅳ Multi V Ⅳ Multi V 5 Multi V 5 Multi V 5 Comfort...

  • Page 117: The Connecting Of Central Control At Idu Terminals

    This function allows the field connection of the AC-EZ central controller to the indoor unit communications This function is used when the current management is required by proportionally reducing the maximum buss on Multi V 5. MFA specification of the product.

  • Page 118: Fn 21 The Smart Plug

    • If the Smart Plug function is turned on, the power consumption data may be viewed using one of · If do not use a function, set an off-mode. LG's central control/monitoring devices such as ACP, AC Smart, or the multi site communications manager. For installations where a third party BMS system Is present, consumption data is also made available for viewing at the BMS front end using LG's BACnet gateway.

  • Page 119: Svc Mode

    5. SVC Mode 4.20 Optional Base Panel Heater 5.1 Pump Down It is a function to prevent freezing of ODU base pan in a cold area. This function gathers the refrigerant present in the system to ODU. Use this function to store refrigerant of system in ODU for leakage or IDU replacement. ■...
  • Page 120 The maximum amount of refrigerant for Multi V 5 is size dependent and varies be- tween 14.3 and 37.5 lbs / frame. If the system charge is greater than the volume that can be ■...
  • Page 121 LGE Internal Pump Out Use Only ■ Example (Slave2 ODU inverter compressor failure) ■ Detailed information ■ Example (Slave2 ODU inverter compressor failure) • This function is used with heat pump and heat recovery. • For Heat Recovery System • For Heat Recovery System *Note : In systems with short piping systems, the amount of refrigerant that can be pumped from the outdoor unit may be limited and additional refrigerant storage containers may need to be used.
  • Page 122 LGE Internal Pump Out Use Only ■ Example (Slave2 ODU inverter compressor failure) ■ Example (Slave2 ODU inverter compressor failure) 5.3 Vacuum • For Heat Pump System • For Heat Pump System This function is used for creating vacuum in the system after compressor replacement, ODU parts replace- ment or IDU addition/replacement.
  • Page 123 LGE Internal Back Up Use Only LGE Internal Back Up Use Only ■ Auto Back Up ■ Auto Back Up Back Up 5.4 Back Up This function allows the system to operate in case of inverter compressor failure by This function allows the system to operate in case of inverter compressor failure by backing up com- This function is used when backing up outdoor units or compressors.

  • Page 124: Display Cycle Information

    5.5 Forced Oil Return 5.7 Display Cycle Information This function is used in recovering the oil level of the compressor through recollecting the accumulated oil This function is to display the main parameter value displayed by LGMV in real time through the 7-segment in the pipe.

  • Page 125: Se 9 Noise Reduction

    5.8 Noise Reduction 5.9 Entry Heating Oil Return It is a function to reduce the noise of the entire system. This function is for performing oil recovery operation while heating operation. The refrigerant noise claim occurs due to repetition of oil recovery operation, this function will be checked and applied.

  • Page 126: Heating Fan Low Noise

    5.10 Heating Fan Low Noise 5.11 Number of Partial Defrosts It is a function to reduce outdoor fan max rpm by adjusting low target pressure while heating mode. This function is used for continuous heating control by option setting split defrost (heating cycle, upper / lower valve control) ■...

  • Page 127: Idu Mode

    6. IDU Mode 5.12 Level Changes of CH200 6.1 EEV Pulse of Non-operating IDU in Heating It is a function to change CH200 error level. It is the function to adjust EEV pulse of no IDU in heating. ■ Setting the function ■...

  • Page 128: Set Idu Superheat

    6.2 Set IDU Superheat / Set IDU Subcool 6.3 Set Auto Pipe Detection / Start Auto Pipe Detection This function is used to set additional superheat and subcool in the indoor unit. The function that sets connection relationship automatically between the indoor unit and heat recovery unit. ■...

  • Page 129: Set Zone Master

    6.4 Set Zone Master ·Execute auto pipe detection again whenever the indoor PCB and HR unit PCB is replaced. - Operation error occurs unless power is supplied to the indoor and HR units. It is a function to operate according to the mode of the master indoor unit when several indoor units are ·...

  • Page 130: Operating Idu Low Noise

    6.5 Operating IDU Low Noise 6.6 In Cooling IDU EEV Max. Pulse This function is used to reduce refrigerant noise when the indoor unit starts to run It is the function to prevent excessive opening by setting EEV maximum pulse of indoor unit in cooling. for heat recovery system.

  • Page 131: Comfort Cooling

    App. The Logic of Comfort Cooling 6.7 Comfort Cooling • Comfort Cooling means the superheat control of indoor unit. It is function to reduce the ODU energy consumption by the continuous operation without thermo off. : Changes the refrigerant flow rate of each indoor unit by EEV •...

  • Page 132: Non-Operating Idu Subcool

    6.8 Non-operating IDU Subcool 6.9 Set IDU Superheat For Fan It is function to reduce refrigerant noise that might be heard when non-operating IDU EEV is opened to It is a function to alleviate dew condensation on indoor unit panel by setting additional superheat according recover liquid accumulated inside IDU.
  • Page 133 2017 Trouble Shooting Guide Book Visual Elements Logo Publisher LG Electronics Air Conditioning & Energy Solution Company, SAC Engineering Division Issued date May 2017 Adress LG Twin Towers, 20, Yeouido-dong, Yeongdeungpo-gu, Seoul 150-721, Korea http://kic.lgeaircon.com All rights are reserved by LG Electronics.

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