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LG Multi IV Engineering Manual
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LG Multi IV Engineering Manual

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ENGINEERING MANUAL
Variable Refrigerant Flow Outdoor Units
6.0 to 42.0 Tons

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Summary of Contents for LG Multi IV

  • Page 1 ENGINEERING MANUAL Variable Refrigerant Flow Outdoor Units 6.0 to 42.0 Tons...
  • Page 2 A summary list of safety precautions is on page 3. For more technical materials such as submittals, catalogs, installation, owner’s, and service manuals, visit www.lghvac.com. For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice. © LG Electronics U.S.A., Inc.

  • Page 3: Table Of Contents

    Pipe Sizing for ARUN Series Heat Pump Systems ......120 Pipe Sizing for ARUB Series Heat Recovery Systems ....124 Acronyms ....................6 LG Engineered Y-branch Kits ............127 LG Engineered Header Kits ............. 132 ..............8 LATS Calculated Refrigerant Charge ..........134 Multi V IV Heat Pump and Heat Recovery Outdoor Units..8...
  • Page 4 UNIT NOMENCLATURE Outdoor and Heat Recovery Units Outdoor Units (ODU) Family ARU = Multi V Outdoor Unit (Refrigerant R410A) Type N = Inverter Heat Pump B = Inverter Heat Recovery Nominal Capacity (Nominal cooling capacity in Btu/h) 072 = 72,000 192 = 192,000 312/313 = 312,000 432 = 432,000...

  • Page 5: Unit Nomenclature

    UNIT NOMENCLATURE Indoor Units Indoor Units (IDU) Family ARN = Multi V Indoor Unit (Refrigerant R410A) Type U = DC Inverter Heat Pump Indoor Unit Nominal Capacity 05 = 5,000 Btu/h 18 = 18,000 Btu/h 42 = 42,000 Btu/h 07 = 7,000 Btu/h 24 = 24,000 Btu/h 48 = 48,000 Btu/h 09 = 9,000 Btu/h...
  • Page 6 Air-Conditioning, Heating, and Refrigeration Institute LEED Leadership in Energy and Environmental Design American Society of Heating, Refrigeration, and ASHRAE LGAP LG Air Conditioner Protocol Air Conditioning Air Handling Unit Mixed Air Temperature American Wire Gauge Thousands BTUs per hour BLDC...

  • Page 7: Product Data

    PRODUCT DATA Mechanical Specifications on page 8 General Data on page 10 Electrical Data on page 31 Outdoor Unit Dimensions on page 35 Heat Recovery Unit Dimensions on page 41 Wiring Diagrams—Outdoor Units on page 44 Refrigerant Flow Diagrams on page 60 Acoustic Data on page 89 Outdoor Unit Accessories on page 97 Indoor Unit Quick Reference on page 102...

  • Page 8: Mechanical Specifications

    Headers, and having integrated controls. bonderized and finished with a baked enamel paint. Each frame has a removable An LG Multi V IV Heat pump system is a inspection panel to allow access to service VRF system that can operate in either cool-...
  • Page 9 MECHANICAL SPECIFICATIONS Multi V IV Outdoor Units / Multi V Heat Recovery Units Fans and Motors Controls All outdoor unit frames <80MBh include one direct drive, variable Heat pump and heat recovery outdoor units are factory wired with speed propeller type fan. All outdoor unit frames >80MBh include two necessary electrical control components, integral microprocessors, direct drives, variable speed propeller type fans.

  • Page 10: General Data

    59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 11 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 12 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 13 Nominal cooling capacity rating obtained with air entering the indoor unit at 80ºF dry bulb (DB) and 67ºF Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet bulb (WB).
  • Page 14 Nominal cooling capacity rating obtained with air entering the indoor unit at 80ºF dry bulb (DB) and 67ºF Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet bulb (WB).
  • Page 15 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 16 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 17 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 18 Nominal cooling capacity rating obtained with air entering the indoor unit at 80ºF dry bulb (DB) and 67ºF Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet bulb (WB).
  • Page 19 Nominal cooling capacity rating obtained with air entering the indoor unit at 80ºF dry bulb (DB) and 67ºF Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet bulb (WB).
  • Page 20 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 21 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 22 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 23 Nominal heating capacity rating obtained with air entering the indoor unit at 70ºF dry bulb (DB) and Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB).
  • Page 24 Nominal cooling capacity rating obtained with air entering the indoor unit at 80ºF dry bulb (DB) and 67ºF Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet bulb (WB).
  • Page 25 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 26 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 27 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG Rated capacity is certified under AHRI Standard 1230. See www.ahrinet.org for information.
  • Page 28 Nominal heating capacity rating obtained with air entering the indoor unit at 70ºF dry bulb (DB) and Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB).
  • Page 29 Nominal cooling capacity rating obtained with air entering the indoor unit at 80ºF dry bulb (DB) and 67ºF Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor must use LG wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet bulb (WB).
  • Page 30 GENERAL DATA Figure 1: Two-Port Heat Recovery Unit. Figure 2: Three-Port Heat Recovery Unit. Figure 3: Four-Port Heat Recovery Unit. Heat recovery units can only be used with LG heat recovery systems. Table 21: Model PRHR022A PRHR032A PRHR042A Number of Ports Max.

  • Page 31: Electrical Data

    ELECTRICAL DATA ARUN Series Heat Pump Outdoor Units Table 23: 208-230V, 60Hz, 3-Phase Heat Pump Units. Condenser Fan Compressor (Comp.) Motor(s) MOCP Motor Amps Amps Frame Frame Frame Motor RLA (Ea.) Nom. Unit Model FLA (Ea.) Comp. Tons Nos. Frame Qty.
  • Page 32 ELECTRICAL DATA ARUN Series Heat Pump Outdoor Units Table 24: 460V, 60Hz, 3-Phase Heat Pump Units. Condenser Fan Compressor (Comp.) Motor(s) MOCP Motor Amps Amps Frame Frame Frame Motor RLA (Ea.) Nom. FLA (Ea.) Unit Model Nos. Comp. Tons Qty. Frame Frame Qty.
  • Page 33 ELECTRICAL DATA ARUB Series Heat Recovery Outdoor Units Table 25: 208-230V, 60Hz, 3-Phase Heat Recovery Units. Condenser Fan Compressor (Comp.) Motor(s) MOCP Motor Amps Amps Frame Frame Frame Motor RLA (Ea.) FLA (Ea.) Nom. Unit Model Comp. Tons Nos. Frame Qty.
  • Page 34 ELECTRICAL DATA ARUB Series Heat Recovery Outdoor Units Table 26: 460V, 60Hz, 3-Phase Heat Recovery Units. Condenser Fan Compressor (Comp.) Motor(s) MOCP Motor Amps Amps Frame Frame Frame Motor RLA (Ea.) Nom. FLA (Ea.) Unit Model Nos. Comp. Tons Qty. Frame Frame Qty.

  • Page 35: Center Of Gravity

    OUTDOOR UNIT DIMENSIONS 36-1/4" Airflow 29-15/16" 66-1/8" 7-1/4" 2-15/16" 3-1/8" 5-1/2" Top View 5-3/8" Airflow 22-7/16" 2-9/16" 2-9/16" Access Panel 24-3/16" 2-9/16" 3-5/16" 2-1/2"Diameter twist cap 29-1/16" 7/16" 1"Diameter Wiring knockout 2-5/8" Piping Entry knockout 31-3/16" 2-1/2"Diameter Wiring knockout Center of Gravity Front View Side View 17-5/8"...
  • Page 36 OUTDOOR UNIT DIMENSIONS 48-13/16" 29-15/16" Airflow 66-1/8" 7-1/4" 2-15/16" 3-1/8" Top View 5-1/2" Airflow 5-3/8" 2-9/16 24-3/16" 2-9/16" 3-5/16" 29-1/16" 7/16" 1"Diameter wiring knockout 2-5/8" 2-1/2"Diameter wiring knockout 43-3/8" Center of Gravity Front View Side View 1/2" Diameter hole 17-5/8" 13-1/2"...
  • Page 37 OUTDOOR UNIT DIMENSIONS 36-1/4" 48-13/16" 29-15/16" Airflow 66-1/8" Airflow 7-1/4" Airflow 2-15/16" Airflow 3-1/8" 5-1/2" 5-3/8" 2-9/16 Min. 2-3/4" 24-3/16" 2-9/16" 3-5/16" 29-1/16" 7/16" 2-5/8" 31-3/16" 2-5/8" 43-3/8" Piping Entry knockout 1"Diameter wiring Center of Gravity knockout 2-1/2"Diameter wiring knockout 17-5/8"...
  • Page 38 OUTDOOR UNIT DIMENSIONS 48-13/16" 29-15/16" 66-1/8" Airflow Airflow 7-1/4" 2-15/16" 3-1/8" Min. 2-3/4" 5-1/2" Top View Airflow 5-3/8" 2-9/16 24-3/16" 2-9/16" 3-5/16" 29-1/16" 7/16" 2-5/8" 1"Diameter wiring 43-3/8" 2-1/2"Diameter wiring knockout Center of Gravity Front View Side View M3 3 3 24-3/4"...
  • Page 39 OUTDOOR UNIT DIMENSIONS © PRODUCT DATA | 39...
  • Page 40 OUTDOOR UNIT DIMENSIONS © 40 | PRODUCT DATA...

  • Page 41: Heat Recovery Unit Dimensions

    HEAT RECOVERY UNIT DIMENSIONS PRHR022A © PRODUCT DATA | 41...
  • Page 42 HEAT RECOVERY UNIT DIMENSIONS PRHR032A © 42 | PRODUCT DATA...
  • Page 43 HEAT RECOVERY UNIT DIMENSIONS PRHR042A © PRODUCT DATA | 43...

  • Page 44: Wiring Diagrams

    WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2 TERMINAL BLOCK...
  • Page 45 WIRING DIAGRAMS Heat Pump MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR SUCTION PIPE THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2...
  • Page 46 WIRING DIAGRAMS ARUN145BTE4/ARUN145DTE4, ARUN169BTE4/ARUN169DTE4 frames are ONLY for use in large capacity triple frame combinations. They cannot be used as stand alone models or in a dual frame combination. These frames ARE NOT interchangeable with ARUN144BTE4/ ARUN144DTE4, ARUN168BTE4/ARUN168DTE4 single frame models. ©...
  • Page 47 WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2 TERMINAL BLOCK...
  • Page 48 WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2 MAIN PCB COMMUNICATION...
  • Page 49 WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR SUCTION PIPE THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2...
  • Page 50 WIRING DIAGRAMS ARUN145BTE4/ARUN145DTE4, ARUN169BTE4/ARUN169DTE4 frames are ONLY for use in large capacity triple frame combinations. They cannot be used as stand alone models or in a dual frame combination. These frames ARE NOT interchangeable with ARUN144BTE4/ ARUN144DTE4, ARUN168BTE4/ARUN168DTE4 single frame models. ©...
  • Page 51 WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2 TERMINAL BLOCK...
  • Page 52 WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR LIQUID PIPE THERMISTOR OUTDOOR AIR THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2...
  • Page 53 WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2 TERMINAL BLOCK...
  • Page 54 WIRING DIAGRAMS ARUB145BTE4/ARUB145DTE4, ARUB169BTE4/ARUB169DTE4 frames are ONLY for use in large capacity triple frame combinations. They cannot be used as stand alone models or in a dual frame combination. These frames ARE NOT interchangeable with ARUB144BTE4/ARUB- 144DTE4, ARUB168BTE4/ARUB168DTE4 single frame models. ©...
  • Page 55 WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2 TERMINAL BLOCK...
  • Page 56 WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2 TERMINAL BLOCK...
  • Page 57 WIRING DIAGRAMS MAIN PCB COMMUNICATION TERMINAL LOW PRESSURE SENSOR HIGH PRESSURE SENSOR OUTDOOR AIR THERMISTOR MAIN ELECTRONIC EXPANSION VALVE 1 SUB-COOLING ELECTRONIC EXPANSION VALVE MAIN ELECTRONIC EXPANSION VALVE 2 OIL BALANCE ELECTRONIC EXPANSION VALVE VAPOR INJECTION ELECTRONIC EXPANSION VALVE 1 VAPOR INJECTION ELECTRONIC EXPANSION VALVE 2 TERMINAL BLOCK...
  • Page 58 WIRING DIAGRAMS ARUB145BTE4/ARUB145DTE4, ARUB169BTE4/ARUB169DTE4 frames are ONLY for use in large capacity triple frame combinations. They cannot be used as stand alone models or in a dual frame combination. These frames ARE NOT interchangeable with ARUB144BTE4/ARUB- 144DTE4, ARUB168BTE4/ARUB168DTE4 single frame models. ©...
  • Page 59 WIRING DIAGRAMS © PRODUCT DATA | 59...

  • Page 60: Refrigerant Flow Diagrams

    REFRIGERANT FLOW DIAGRAMS Cooling Mode Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor Charging Port High Pressure Pressure Vapor Pipe Sensor Switch...
  • Page 61 REFRIGERANT FLOW DIAGRAMS Heating Mode Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor Charging Port High Pressure Pressure Vapor Pipe Sensor Switch...
  • Page 62 REFRIGERANT FLOW DIAGRAMS Oil Return and Defrost Operation Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor Charging Port High Pressure Pressure Vapor Pipe...
  • Page 63 REFRIGERANT FLOW DIAGRAMS Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor For 8/10 ton Charging Port High Pressure Pressure Vapor Pipe Sensor...
  • Page 64 REFRIGERANT FLOW DIAGRAMS Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor For 8/10 ton Charging Port High Pressure Pressure Vapor Pipe Sensor...
  • Page 65 REFRIGERANT FLOW DIAGRAMS Cooling Mode Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Low Temperature Low Pressure Vapor Temperature Sensor Charging Port High Pressure Pressure Vapor Pipe Sensor Switch...
  • Page 66 REFRIGERANT FLOW DIAGRAMS Heating Mode Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor Charging Port High Pressure Pressure Sensor Switch Vapor Pipe...
  • Page 67 REFRIGERANT FLOW DIAGRAMS Oil Return and Defrost Operation Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Low Temperature Low Pressure Vapor Temperature Sensor Charging Port High Pressure Pressure Vapor Pipe...
  • Page 68 REFRIGERANT FLOW DIAGRAMS Operation Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor Outdoor High Temperature High Pressure Liquid Temperature Low Temperature Low Pressure Vapor Sensor Charging Port High Pressure Pressure Sensor Switch Vapor Pipe Liquid Pipe...
  • Page 69 REFRIGERANT FLOW DIAGRAMS Operation Indoor Heat Exchanger Indoor Heat Exchanger Electronic Electronic Expansion Valve Expansion Valve High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Low Temperature Low Pressure Vapor Temperature Sensor Charging Port High Pressure Pressure Active Path Sensor Switch Vapor Pipe...
  • Page 70 REFRIGERANT FLOW DIAGRAMS Cooling Mode Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor High Pressure Vapor Pipe High Pressure...
  • Page 71 REFRIGERANT FLOW DIAGRAMS Cooling at Low Ambient Temperatures Indoor HEX Indoor Uni t Heat Recovery Unit Indoor HEX Indoor Uni t Indoor HEX Indoor Uni t Indoor HEX Indoor Uni t High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor...
  • Page 72 REFRIGERANT FLOW DIAGRAMS Heating Mode Indoor HEX Indoor Uni t Heat Recover Unit Indoor HEX Indoor Uni t Indoor HEX Indoor Uni t Indoor HEX Indoor Uni t High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor High Pressure...
  • Page 73 REFRIGERANT FLOW DIAGRAMS Oil Return and Defrost Operation Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor High Pressure Pressure...
  • Page 74 REFRIGERANT FLOW DIAGRAMS Cooling-based Simultaneous Operation Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor High Pressure Pressure...
  • Page 75 REFRIGERANT FLOW DIAGRAMS Heating-based Simultaneous Operation Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor High Pressure Pressure...
  • Page 76 REFRIGERANT FLOW DIAGRAMS Balanced Simultaneous Operation Indoor HEX Indoor Uni t Heat Recovery Unit Indoor HEX Indoor Uni t Indoor HEX Indoor Uni t Indoor HEX Indoor Uni t High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor...
  • Page 77 REFRIGERANT FLOW DIAGRAMS Indoor HEX Indoor Uni t Heat Recovery Unit Indoor HEX Indoor Uni t Indoor HEX Indoor Uni t Indoor HEX Indoor Uni t High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor High Pressure Pressure...
  • Page 78 REFRIGERANT FLOW DIAGRAMS Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor High Pressure Pressure High Pressure Vapor Pipe...
  • Page 79 REFRIGERANT FLOW DIAGRAMS Cooling Mode Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Gas High Temperature High Pressure Liquid Outdoor Low Temperature Low Pressure Gas Temperature Fa n Sensor...
  • Page 80 REFRIGERANT FLOW DIAGRAMS Cooling at Low Ambient Temp. Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Low Temperature Low Pressure Vapor Temperature Sensor High Pressure...
  • Page 81 REFRIGERANT FLOW DIAGRAMS Heating Mode Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Low Temperature Low Pressure Vapor Temperature Sensor High Pressure...
  • Page 82 REFRIGERANT FLOW DIAGRAMS Oil Return and Defrost Operation Indoor HEX Indoor HEX Indoor Unit Indoor Uni Heat Recovery Unit Indoor HEX Indoor HEX Indoor Unit Indoor Uni Indoor HEX Indoor HEX Indoor Uni Indoor Unit Indoor HEX Indoor HEX Indoor Uni Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid...
  • Page 83 REFRIGERANT FLOW DIAGRAMS Cooling-based Simul. Operation Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Gas High Temperature High Pressure Liquid Outdoor Outdoor Low Temperature Low Pressure Gas Temperature Temperature Sensor...
  • Page 84 REFRIGERANT FLOW DIAGRAMS Heating-based Simul. Operation Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Temperature Low Temperature Low Pressure Vapor Sensor High Pressure Pressure...
  • Page 85 REFRIGERANT FLOW DIAGRAMS Balanced Simul. Operation Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Low Temperature Low Pressure Vapor Temperature Sensor High Pressure...
  • Page 86 REFRIGERANT FLOW DIAGRAMS Operation Indoor HEX Indoor Unit Heat Recovery Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit Indoor HEX Indoor Unit High Temperature High Pressure Vapor High Temperature High Pressure Liquid Outdoor Low Temperature Low Pressure Vapor Temperature Sensor High Pressure Pressure...
  • Page 87 REFRIGERANT FLOW DIAGRAMS Operation Indoor HEX Indoor HEX Indoor Uni HR unit HR unit Indoor HEX Indoor HEX Indoor Unit Indoor HEX Indoor HEX Indoor Unit Indoor HEX Indoor HEX Indoor Unit High Temperature High Pressure Vapor High High mperature High Pressure Liquid High Te Outdoor Outdoor...
  • Page 88 REFRIGERANT FLOW DIAGRAMS A : Switch operation between cooling and heating. B : Decreases noise following subcooling operation between inlet of one indoor unit and outlet of another indoor unit during simultaneous operation. C : Prevents liquid from entering high-pressure vapor valve and heat recovery unit during cooling mode. D : Controls pressure between the high and low pressure vapor pipes during simultaneous operation.

  • Page 89: Acoustic Data

    ACOUSTIC DATA Sound Pressure Levels - Measurement Location Figure 4: Sound Pressure Measurement Location. Table 27: Heat Pump Sound Pressure Levels. Heat Pump Models dB(A) 208-230V 460V ARUN072BTE4 ARUN072DTE4 58.5 ARUN096BTE4 ARUN096DTE4 59.0 ARUN121BTE4 ARUN121DTE4 59.0 ARUN144BTE4 ARUN144DTE4 59.5 ARUN145BTE4 ARUN145DTE4 59.5 ARUN168BTE4...
  • Page 90 ACOUSTIC DATA Sound Pressure Levels - Heat Pump Heat Pump Sound Pressure Levels ARUN072BTE4, ARUN072DTE4 ARUN096BTE4, ARUN121BTE4, ARUN144BTE4, ARUN145BTE, ARUN168BTE4, ARUN096DTE4, ARUN121DTE4 ARUN144DTE4, ARUN145DTE, ARUN168DTE4 NC-65 NC-65 NC-65 NC-60 NC-60 NC-60 NC-55 NC-55 NC-55 NC-50 NC-50 NC-50 NC-45 NC-45 NC-45 NC-40 NC-40 NC-40...
  • Page 91 ACOUSTIC DATA Sound Pressure Levels - Heat Pump / Heat Recovery Heat Pump Sound Pressure Levels, continued ARUN456BTE4, ARUN480DTE4, ARUN504BTE4 ARUN432BTE4, ARUN432DTE4 ARUN384BTE4, ARUN384DTE4 ARUN408BTE4, ARUN408DTE4, ARUN504DTE4 ARUN408BTE4, ARUN408DTE4 Heat Recovery Sound Pressure Levels ARUB072BTE4, ARUB072DTE4 ARUB096BTE4, ARUB121BTE4, ARUB144BTE4, ARUB168BTE4, ARUB096DTE4, ARUB121DTE4 ARUB144DTE4, ARUB168DTE4 NC-65...
  • Page 92 ACOUSTIC DATA Sound Pressure Levels - Heat Recovery Heat Recovery Sound Pressure Levels, continued ARUB312BTE4, ARUB336BTE4, ARUB360BTE4, ARUB360DTE4 ARUB312DTE4, ARUB336DTE4 ARUB384BTE4, ARUB384DTE4 ARUB408BTE4, ARUB408DTE4 NC-65 NC-65 NC-60 NC-60 NC-55 NC-55 NC-50 NC-50 NC-45 NC-45 NC-40 NC-40 NC-35 NC-35 NC-30 NC-30 NC-25 NC-25 Approximate...
  • Page 93 ACOUSTIC DATA Sound Power Levels • Data is valid under diffuse field conditions. • Data is valid under nominal operating conditions. ARUN145BTE4/ARUN145DTE4, ARUB145BTE4/ARUB145DTE4, • Sound level may be increased in static pressure mode or if air ARUN169BTE4/ARUN169DTE4, ARUB169BTE4/ARUB169DTE4 guide is used. frames are ONLY for use in large capacity triple frame combina- •...
  • Page 94 ACOUSTIC DATA Sound Power Levels - Heat Pump Heat Pump Sound Power Levels, continued ARUN216BTE4, ARUN216DTE4 ARUN169BTE4, ARUN169DTE4 ARUN192BTE4, ARUN192DTE4 NR-90 NR-90 NR-90 NR-85 NR-85 NR-85 NR-80 NR-80 NR-80 NR-75 NR-75 NR-75 NR-70 NR-70 NR-70 NR-65 NR-65 NR-65 NR-60 NR-60 NR-60 NR-55 NR-55...
  • Page 95 ACOUSTIC DATA Sound Power Levels - Heat Pump / Heat Recovery Heat Pump Sound Power Levels, continued ARUN456BTE4, ARUN480BTE4, ARUN504BTE4 ARUN432BTE4, ARUN432DTE4 ARUN456DTE4, ARUN480DTE4, ARUN504DTE4 NR-90 NR-90 NR-85 NR-85 NR-80 NR-80 NR-75 NR-75 NR-70 NR-70 NR-65 NR-65 NR-60 NR-60 NR-55 NR-55 NR-50 NR-50...
  • Page 96 ACOUSTIC DATA Sound Power Levels - Heat Recovery Heat Recovery Sound Power Levels, continued ARUB240BTE4, ARUB264BTE4, ARUB288BTE4, ARUB288DTE4 ARUB312BTE4, ARUB312DTE4 ARUB240DTE4, ARUB264DTE4 NR-90 NR-90 NR-90 NR-85 NR-85 NR-85 NR-80 NR-80 NR-80 NR-75 NR-75 NR-75 NR-70 NR-70 NR-70 NR-65 NR-65 NR-65 NR-60 NR-60 NR-60...

  • Page 97: Outdoor Unit Accessories

    ARUB096BTE4, ARUB096DTE4, ARUB121BTE4, ARUB121DTE4, ARUB144BTE4, ARUB144DTE4, ARUB145BTE4, ARUB145DTE4, ARUB168BTE4, ARUB168DTE4, ARUB169BTE4, ARUB169DTE4 See submittals at www.lg-vrf.com to verify how many kits are needed for each combination frame. ARUN145BTE4-DTE4 / ARUB145BTE4-DTE4, ARUN169BTE4-DTE4 / ARUB169BTE4-DTE4 frames are ONLY for use in large capacity triple frame combinations.
  • Page 98 ARUB096BTE4, ARUB096DTE4, ARUB121BTE4, ARUB121DTE4, ARUB144BTE4, ARUB144DTE4, ARUB145BTE4, ARUB145DTE4, ARUB168BTE4, ARUB168DTE4, ARUB169BTE4, ARUB169DTE4 See submittals at www.lg-vrf.com to verify how many kits are needed for each combination frame. ARUN145BTE4-DTE4 / ARUB145BTE4-DTE4, ARUN169BTE4- DTE4 / ARUB169BTE4-DTE4 frames are ONLY for use in large capacity triple frame combinations.
  • Page 99 IDU, user will not be able to record data. This software can be used to both commission new systems and troubleshoot existing systems. LGMV data can be recorded to a “.CSV” file and emailed to an LG representative to assist with diagnostic evaluations. Recommended Minimum PC Configuration: •...
  • Page 100 © 100 | PRODUCT DATA...
  • Page 101 APPLICATION GUIDELINES Equipment Selection Procedure on page 102 Building Ventilation Design Guide on page 107 Placement Considerations on page 110...

  • Page 102: Equipment Selection Procedure

    ® To ensure that the refrigerant piping design meets LG’s quality standards, a LATS refrigerant piping design must be provided with every Multi V order. Following the installation, if any changes or variations to the design are necessary, a new LATS file must be created and provided to LG prior to system commissioning to ensure the proper pipe size has not changed.
  • Page 103 V Piping Design software works when designing a Multi V HVAC In many buildings, to optimize system design, spaces on opposite system. It should not replace the use of LG’s LATS Multi V sides of the building are combined on a single pipe system served by complimentary selection software, but should instead be used in a common Multi V IV Heat Recovery outdoor unit.
  • Page 104 LATS . (For correction factors, see the separate ambient conditions are outside the cataloged range. Multi V IV Performance Data Manual on www.lg-vrf.com.) Select the Indoor Unit(s) Altitude Correction...
  • Page 105 If the corrected cooling capacity was found using corrected capacity tables found in the separate Heating Peak Load Multi V IV Performance Data Manual on www.lg-vrf.com, apply the CCR% appropriate elevation difference factor also found in the Performance...
  • Page 106 In some designs, over-sized indoor units may be unavoidable in the properly sized and the system’s performance should now be case where the smallest size indoor unit available from LG is larger optimized. The VRF system component size selections should be than what is necessary to satisfy the space load.

  • Page 107: Building Ventilation Design Guide

    LG Electronics, U.S.A., Inc., In all cases, the designer, installer, and contractor should understand if the suggested method is used, it is used at their own risk. LG Electronics U.S.A., Inc., takes no responsibility and offers no warranty, expressed or implied, in law or in •...
  • Page 108 • Motorized dampers may be required to prevent outdoor air flow through the indoor unit when the indoor unit is not operating. • An LG Dry Contact adapter may be necessary to interlock the motorized damper with the indoor unit.
  • Page 109 • Motorized dampers may be required to prevent outdoor air from entering the indoor unit while the indoor unit has cycled off. • An LG Dry Contact adapter is necessary to interlock the motorized damper with the indoor unit fan operation.

  • Page 110: Placement Considerations

    PLACEMENT CONSIDERATIONS Outdoor Units Selecting the Best Location—Outdoor Units Select a location for installing the outdoor unit that will meet the following conditions: • Where the unit will not be subjected to direct thermal radiation from other heat sources. • Where operating sound from the unit will not disturb inhabitants of surrounding buildings. •...

  • Page 111: Outdoor Units

    PLACEMENT CONSIDERATIONS Outdoor Units Figure 11: Outdoor Unit—Mounting Methods General Mounting Securely attach the outdoor unit to a condenser pad, base rails, or other mounting platform that is securely anchored to the ground or building structure. Refer to dimensional drawings in the “Product Data”...

  • Page 112: Installation Area

    PLACEMENT CONSIDERATIONS Outdoor Units Installation Space Proper airflow through the outdoor unit coil is critical for proper unit operation. When installing the outdoor unit, consider service, inlet, and outlet, and minimum allowable space requirements as illustrated in the diagrams below. Figure 12: Minimum Space Requirements.
  • Page 113 Installing Outdoor Units Indoors LG Multi V outdoor units are engineered to be mounted outdoors and include technology designed to minimize the negative effects of winter weather’s freezing rain, sleet, and snow. Some building projects, however, necessitate placing the HVAC outdoor units indoors: •...
  • Page 114 For more detailed information on how to design indoor spaces for LG Multi V outdoor units, see the white paper "Air-Source VRF Mechanical Room Design Considerations for Outdoor Unit Placement in Enclosures"...

  • Page 115: Heat Recovery Unit

    • Ensure there is enough space in the installation area for service access. • Refrigerant pipes must not exceed lengths specified by LG Electronics. • Do not install the heat recovery unit in a location where it would be subjected to strong radiation heat from heat sources.
  • Page 116 PLACEMENT CONSIDERATIONS Heat Recovery Units Figure 15: Heat Recovery Unit Types. PRHR022A (Two [2] ports) PRHR032A (Three [3] ports) PRHR042A (Four [4] ports) 1. Each heat recovery unit has a capacity up to 192,000 Btu/h. 2. Heat recovery units connected in series have a total capacity up to 192,000 Btu/h per series string. Series string is defined as heat recovery units piped in series.
  • Page 117 Pipe Sizing for ARUN Series Heat Pump Systems on page 120 Pipe Sizing for ARUB Series Heat Recovery Systems on page 124 LG Engineered Y-branch Kits on page 127 LG Engineered Header Kits on page 132 LATS Calculated Refrigerant Charge on page 134...
  • Page 118 Piping Design Guideline Summary The proper design and installation of the refrigerant piping system is a critical element of a Multi V system. As detailed on page 102, LG provides engineers LG Air Conditioner Technical Solution (LATS) software to help design LG Multi V air conditioning systems. The following pages are examples of manual pipe size calculations for Multi V refrigerant piping systems.
  • Page 119 REFRIGERANT PIPING DESIGN Piping Design Guideline Summary Figure 16: Typical VRF Heat Pump System Building Layout Listing the Figure 17: Typical VRF Heat Recovery System Building Layout Listing Piping Limitations. the Piping Limitations.. Elevation Differential Two IDUs Connected to One HRU: 49' Max.
  • Page 120 REFRIGERANT PIPING DESIGN Piping Design Guideline Summary Pipe Sizing for ARUN Series Heat Pump Systems Figure 18: Heat Pump Triple-Frame Connections. Slave2 Slave1 Master ARCNN21 and ARCNN31 Outdoor Unit Connector Pipe Accessories D (main pipe ARCNN21 sized by LATS) To Indoor Units (Multi-frame Outdoor Unit Y-branch Connector) ARCNN31...
  • Page 121 REFRIGERANT PIPING DESIGN Piping Design Guideline Summary The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations. Y-branch Pipe Sizing When Installing a Triple-Frame System Example: Five (5) indoor units connected Slave2 ODU ODU: Outdoor Units.
  • Page 122 REFRIGERANT PIPING DESIGN Piping Design Guideline Summary The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations. Combination Y-branch Pipe and Header Pipe Sizing When Installing a Dual- Frame System Example: Five (5) indoor units connected Slave ODU ODU: Outdoor Units.
  • Page 123 REFRIGERANT PIPING DESIGN Piping Design Guideline Summary The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations. Table 37: Pipe Capabilities. Total pipe length Longest actual pipe length Equivalent pipe length Length Longest pipe length after first branch Elevation1...

  • Page 124: Pipe Sizing For Arub Series Heat Recovery Systems

    REFRIGERANT PIPING DESIGN Piping Design Guideline Summary The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations. Pipe Sizing for ARUB Series Heat Recovery Systems Figure 19: Heat Recovery Triple-Frame Connections. Slave2 Slave1 Master...
  • Page 125 REFRIGERANT PIPING DESIGN Piping Design Guideline Summary The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations. Pipe Sizing for ARUB Series Heat Recovery Systems Example: Triple-frame system, four (4) heat recovery units, Slave2 Slave1 one (1) header, and twelve (12) indoor units connected...
  • Page 126 REFRIGERANT PIPING DESIGN Piping Design Guideline Summary The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations. Table 40: Refrigerant Pipe (B) Diameter between Y-branches and Y-branches / Heat Recovery Unit / Headers. Vapor pipe (inches OD) Downstream IDU total capacity (Btu/h) Liquid pipe (inches OD)
  • Page 127 Y-Branch Kits LG Y-branch and kits are highly engineered devices designed to evenly divide the flow of refrigerant, and are used to join one pipe segment to two or more segments. There are two types of Y-branches used in LG VRF systems: Y-branches that combine two or three outdoor units to make up one large-capacity outdoor unit (also known as multi-frame connectors), or Y-branches used with the indoor units in the refriger- ant piping system at each transition.
  • Page 128 REFRIGERANT PIPING DESIGN Indoor Unit Y-branches for ARUN Series Heat Pump Systems Unit: Inch Vapor pipe Liquid pipe Models I.D. 1/2 I.D. 3/8 I.D. 1/4 I.D. 1/2 I.D. 1/4 I.D. 3/8 I.D. 5/8 I.D. 5/8 I.D. 5/8 2-15/16 I.D. 1/4 2-15/16 I.D.
  • Page 129 REFRIGERANT PIPING DESIGN Indoor Unit Y-branches for ARUB Series Heat Recovery Units Unit: Inch Models Low-Pressure Vapor Pipe Liquid pipe High-Pressure Vapor Pipe I.D. 3/8 I.D. 1/2 I.D. 3/8 I.D. 1/2 I.D. 1/4 I.D. 1/2 I.D. 5/8 I.D. 1/4 I.D. 3/8 I.D.
  • Page 130 REFRIGERANT PIPING DESIGN Outdoor Unit Y-branches for ARUN Series Heat Pump Systems For Dual-Frame Heat Pump Systems Unit: inch Multi-Frame Combination Vapor pipe Liquid pipe Connector 16-3/8 13-1/16 16-1/16 12-3/8 I.D. 1-1/8 I.D. 1-1/8 I.D. 5/8 I.D. 5/8 I.D. 1/2 3-5/16 I.D.
  • Page 131 REFRIGERANT PIPING DESIGN Outdoor Unit Y-branches for ARUB Series Heat Recovery Units For Dual-Frame Heat Recovery Systems Unit: inch Multi-Frame Combination specification Low-Pressure Vapor Pipe Liquid Pipe High-Pressure Vapor Pipe Connector I.D.1-1/4 13-1/16 16-3/8 I.D.1-3/8 I.D. 1-1/8 I.D. 1 I.D. 1-1/4 12-3/8 I.D.
  • Page 132 Figure 24: Header Kit—Horizontal Rotation Limit (Must be Installed Level with No Rotation). Header Kits LG Header kits are highly engineered devices designed to evenly divide the flow of refrigerant, and Largest IDU...
  • Page 133 REFRIGERANT PIPING DESIGN Unit: Inch Models Vapor pipe Liquid pipe 14-3/16 14-3/16 4-3/4 4-3/4 I.D. 1/2 I.D. 1/4 I.D. 1/4 4 branch I.D. 1/2 I.D. 3/8 I.D. 5/8 5-15/16 5-15/16 I.D. 3/8 4-3/4 4-3/4 ARBL054 I.D. 5/8 I.D. 3/8 I.D. 5/8 I.D.
  • Page 134 Consider refrigerant safety in all designs. LG Multi V IV outdoor units ship from the factory with a charge of R410A refrigerant. This charge serves as the base charge and will not be sufficient for the system to operate. A trim charge will need to be added after the system is installed that is based on system design. LATS Multi V piping design software will calculate the size of the refrigerant piping and calculate the refrigerant charge;...
  • Page 135 REFRIGERANT PIPING DESIGN Figure 26: LATS Tree Diagram for Multi V IV Heat Recovery System Test Update System No: 1/1 Example. Determining the Total System Charge (Refer to Table 49) 1. Using the LATS Tree diagram, document the linear feet of straight liquid piping and the quantity and type of each fitting by pipe diameter into System Refrigerant Charge Calculator.
  • Page 136 REFRIGERANT PIPING DESIGN Table 49: System Refrigerant Charge Calculator (lbs.). Job Name_______________________________________ Project Manager__________________________________ System Tag or ID____________________________________ Date___________________________________________ Line # Description Chassis I.D. Size Quantity CF (Ref.) Total (lbs.) Linear feet of 1/4" liquid line tubing — — 0.015 Linear feet of 3/8"...
  • Page 137 LG recommends soft copper use to be limited to 1/2". Use hard drawn for larger sizes to avoid sags and kinks that lead to oil trapping. Table 51: ACR Rated Piping Tube Thicknesses.
  • Page 138 LAYOUT BEST PRACTICES Selecting Field-Supplied Copper Tubing Table 52: Linear Thermal Expansion of Copper Tubing in Inches. Fluid Temperature °F Pipe Length 35° 40° 45° 50° 55° 60° 65° 70° 75° 80° 85° 90° 95° 100° 105° 110° 115° 120° 125° 130° 0.04 0.04 0.05...
  • Page 139 LAYOUT BEST PRACTICES Selecting Field-Supplied Copper Tubing Figure 27: Coiled Expansion Loops and Offsets (Plan View). Large Tubing U-bend (>3/4 in.) Loop Small Tubing U-bend (<3/4 in.) Table 53: Radii of Coiled Expansion Loops and Developed Lengths of Expansion Offsets. Anticipated Linear Nominal Tube Size (OD) inches Expansion (LE) (inches)
  • Page 140 Field-Provided Isolation Ball Valves LG maintains a neutral position on using isolation valves in VRF refrigerant piping systems. LG does not endorse any manufacturer of isola- tion valves. It is recognized that installing isolation valves may simplify future maintenance requirements, and, if used, considerations should be taken including, but not limited to, the following: •...
  • Page 141 LAYOUT BEST PRACTICES General Information / Guidelines No Pipe Size Substitutions Use only the pipe size selected by the LATS Multi V pipe system design software. Using a different size is prohibited and may result in a system malfunction or failure to work at all. Pipe Supports Figure 29: Pipe Hanger Details.
  • Page 142 Pipe Sleeves at Penetrations LG requires that all pipe penetrations through walls, floors, and pipes buried underground be properly insulated and routed through an appropriate wall sleeve of sufficient size to prevent compression of refrigerant pipe insulation and promote free movement of the pipe within the sleeve.

  • Page 143: Oil Trap

    LAYOUT BEST PRACTICES General Information / Guidelines Refrigerant Piping for Separated Outdoor Units Dual-frame and triple-frame systems should be installed with all outdoor units located next to each other. In conditions where the dual-frame or triple-frame outdoor units need to be separated, the following rules must be followed: Figure 36: Y-branch Measurement Location.
  • Page 144 LAYOUT BEST PRACTICES General Information / Guidelines 2. Inverted traps are required when: Figure 41: Examples of Inverted Traps. a. Piping in a horizontal direction from the outdoor Y-branch towards an out- door unit or another outdoor unit Y-branch is greater than 6.6'. The inverted trap should be installed close to the outdoor unit Y-branch (no To IDUs / HRUs more than 6.6' away).
  • Page 145 LAYOUT BEST PRACTICES General Information / Guidelines Refrigerant Piping Installation Proper system operation depends on the installer using best practices and utmost care while assembling the piping system as one of the main causes of refrigerant leaks is defective connections. For VRF systems, the installer needs to know how perform both flared and brazed connections successfully.
  • Page 146 Mark all pipes at the point where the insulation jacket ends. Remove the jacket. Install field provided insulation on the run-out and main trunk pipes first. Install the LG-provided insulation plugs on the ends of all unused header ports. Peel the adhesive glue protector slip from the insulation jacket and install the clam-shell jacket over the fitting.

  • Page 147: Electrical Connections

    ELECTRICAL CONNECTIONS ARUN Series Heat Pump Systems on page 148 ARUB Series Heat Recovery Systems on page 149 DIP Switch Settings for Gen4 Equipment on page 150...
  • Page 148 ARUN SERIES HEAT PUMP SYSTEMS Figure 45: Typical Multi V IV Heat Pump VRF System Power and Communications Wiring Schematic. 3 Phase 3 Wires Power supply 60Hz 208-230V or Master Slave1 Slave2 60Hz 460V Main Switch R(L1) S(L2) T(L3) R(L1) S(L2) T(L3) R(L1) S(L2) T(L3) Switch Switch...
  • Page 149 ARUB SERIES HEAT RECOVERY SYSTEMS Figure 46: Typical Multi V IV Heat Recovery VRF System Power and Communications Wiring Schematic. 3 Phase 3 Wires Power supply 60Hz 208-230V or Master Slave1 Slave2 60Hz 460V R( L 1) S( L 2) T( L 3 ( L 1) S( L 2) T( L 3 ( L 1) S( L 2) T( L 3) Main Switch...

  • Page 150: Dip Switch Settings For Gen4 Equipment

    Generation 4 Equipment The latest versions of LG’s indoor units and outdoor (air / water source) units are designated Generation 4 (Gen 4). For Gen 4 units to oper- ate with Gen 4 features, the air conditioning system must meet the following requirements: •...
  • Page 152 ISO 9001: 2008 LG ELECTRONICS INC. LG Electronics, U.S.A., Inc. EM_MultiVIV_OutdoorUnits_04_16 Commercial Air Conditioning Division Supersedes: EM_MultiVIV_OutdoorUnits_09_15 4300 North Point Parkway EM_MultiVIV_OutdoorUnits_06_15 Alpharetta, Georgia 30022 EM-MultiVIV-OutdoorUnits-05-15 www.lg-vrf.com LG Electronics Commercial Products Support 1-888-865-3026 USA Follow the prompts for commercial A/C products.

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