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INSTALLATION MANUAL
AIR
CONDITIONER
Please read this installation manual completely before installing the product.
Installation work must be performed in accordance with the national wiring standards
by authorized personnel only.
Please retain this installation manual for future reference after reading it thoroughly.
Original instruction
MFL67798017
Rev.06_021225
Copyright © 2014 - 2025 LG Electronics Inc. All Rights Reserved.
www.lg.com
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Summary of Contents for LG MULTI V S ARUN040LSR0
- Page 1 Installation work must be performed in accordance with the national wiring standards by authorized personnel only. Please retain this installation manual for future reference after reading it thoroughly. Original instruction www.lg.com MFL67798017 Rev.06_021225 Copyright © 2014 - 2025 LG Electronics Inc. All Rights Reserved.
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Page 2: Tips For Saving Energy
WARNING TIPS FOR SAVING ENERGY • Installation or repairs made by unqualified Here are some tips that will help you minimize the power consumption when you use the air conditioner. persons can result in hazards to you and You can use your air conditioner more efficiently by referring to the others. - Page 3 • Use the correctly rated breaker or fuse. • If the air conditioner is installed in a small - There is risk of fire or electric shock. room, measures must be taken to prevent the refrigerant concentration from exceeding • Prepare for strong wind or earthquake and the safety limit when the refrigerant leaks.
- Page 4 CAUTION • Do not install the product where it is exposed to sea wind (salt spray) directly. Installation - It may cause corrosion on the product. • Always check for gas (refrigerant) leakage after Corrosion, particularly on the condenser and installation or repair of product.
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Page 5: Table Of Contents
TABLE OF CONTENTS • Safely dispose of the packing materials. - Packing materials, such as nails and other metal TIPS FOR SAVING ENERGY or wooden parts, may cause stabs or other injuries. SAFETY INSTRUCTIONS - Tear apart and throw away plastic packaging bags INSTALLATION PROCESS so that children may not play with them. -
Page 6: Installation Process
INSTALLATION PROCESS OUTDOOR UNITS INFORMATION CAUTION Indicate clearly who will be responsible for switch setting. Determination of division work • Ratio of the connectable Indoor Units to the Outdoor: Within Make connection clearly between outdoor, indoor, 50 ~ 160 % Preparation of contract drawings remote controller and option. -
Page 7: Alternative Refrigerant R410A
ALTERNATIVE REFRIGERANT Select installation location considering following conditions to avoid bad condition when additionally performing defrost operation. R410A • Install the outdoor unit at a place well ventilated and having a lot of sunshine in case of installing the product at a place with a high humidity in winter (near beach, coast, lake, etc). -
Page 8: Installation Space
INSTALLATION SPACE In case of obstacles on the discharge side • The following values are the least space for installation. If any service 1. Stand alone installation area is needed for service according to field circumstance, obtain enough service space. •... -
Page 9: Air Guide Work
2. Collective installation Seasonal wind and cautions in winter • Sufficient measures are required in a snow area or severe cold area in L > H L > H winter so that product can be operated well. • Get ready for seasonal wind or snow in winter even in other areas. •... -
Page 10: Lifting Method
LIFTING METHOD INSTALLATION • When carrying the suspended, unit pass the ropes between legs of • Install at places where it can endure the weight and vibration/noise base panel under the unit. of the outdoor unit. • Always lift the unit with ropes attached at four points so that impact •... -
Page 11: Foundation For Installation
Foundation for Installation Preparation of Piping • Fix the unit tightly with bolts as shown below so that unit will not fall Main cause of gas leakage is defect in flaring work. Carry out correct down due to earthquake or gust. flaring work in the following procedure. -
Page 12: Plumbing Materials And Storage Methods
Flare shape and flare nut tightening torque Insulation of shutoff valve Precautions when connecting pipes Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120 °C). - See the following table for flare part machining dimensions. Precautions in high humidity circumstance: - When connecting the flare nuts, apply refrigerant oil to the inside and This air conditioner has been tested according to the "ISO... -
Page 13: Refrigerant Piping Installation
Nitrogen substitution method REFRIGERANT PIPING Welding, as when heating without nitrogen substitution a large INSTALLATION amount of the oxide film is formed on the internal piping. The oxide film is a caused by clogging EEV, Capillary, oil hole of accumulator and suction hole of oil pump in compressor. Precautions on Pipe connection / Valve operation It prevents normal operation of the compressor. -
Page 14: Pipe Connections Between Indoor And Outdoor Unit
PIPE CONNECTIONS BETWEEN Service Port INDOOR AND OUTDOOR UNIT Refrigerant - Pipe connections can be done on the front side or on the side Charging Port according to the installation environments. - Be sure to let 0.2 kgf/cm Nitrogen flow in the pipe when welding. - If Nitrogen was not flown during welding, many oxidized membranes may form inside the pipe and disturb the normal operations of valves Liquid pipe... -
Page 15: Selection Of Refrigerant Piping
Selection of Refrigerant Piping Refrigerant piping system Y branch method Outdoor unit Example : 5 Indoor Units connected Gas pipe Liquid pipe Branching Ⓐ : Outdoor Unit pipe Ⓑ : 1st branch (Y branch) Main pipe L150 m Ⓒ : Indoor Units l 40 m Indoor unit Total pipe length = A+B+C+D+a+b+c+d+e ≤... -
Page 16: Outdoor Unit Connection
WARNING Header Method Example : 6 Indoor Units • It is recommended that difference of piping length for pipes connected to the Indoor Unit is minimized. Performance connected difference between Indoor Units may occur. Ⓐ : Outdoor Unit L 150 m •... -
Page 17: Refrigerant Charging
WARNING Indoor Unit Connection • Regulation for refrigerant leakage Indoor Unit connecting pipe from branch (a,b,c,d,e,f) : the amount of refrigerant leakage should satisfy the following equation for human safety. Indoor Unit capacity Liquid pipe Gas pipe [mm(inch)] [kW(Btu/h)] [mm(inch)] Total amount of refrigerant in the system ≤0.44 (kg / m ≤... -
Page 18: Distribution Method
Distribution Method Branch pipe Fitting Horizontal Distribution Y branch Ⓐ To Branch Piping or Indoor Unit Ⓑ To Outdoor Unit • Ensure that the branch pipes are attached horizontally or vertically 3rd main pipe distribution (see the diagram below.) Facing Facing Horizontal downwards... - Page 19 • Header should be insulated with the insulator in each kit. Header [unit:mm] Insulate the header using the insulation Models Gas pipe Liquid pipe material attached to the branch pipe kit as shown in the figure. ID12.7 ID6.35 ID6.35 ID6.35 ID6.35 ID6.35 ID6.35...
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Page 20: Leak Test And Vacuum Drying
Leak Test and Vacuum drying Vacuum Vacuum drying should be made from the service port provided on the Leak test outdoor unit’s service valve to the vacuum pump commonly used for liquid pipe, gas pipe and high/low pressure common pipe. (Make Leak test should be made by pressurizing nitrogen gas to 3.8 MPa Vacuum from liquid pipe, gas pipe and high/low pressure common pipe (38.7 kgf/cm... -
Page 21: Vacuum Mode
Vacuum Mode Thermal insulation of refrigerant piping This function is used for creating vacuum in the system after compressor Be sure to give insulation work to refrigerant piping by covering liquid replacement, ODU parts replacement or IDU addition/replacement. pipe and gas pipe separately with enough thickness heat-resistant polyethylene, so that no gap is observed in the joint between indoor unit and insulating material, and insulating materials themselves. -
Page 22: Penetrations
Penetrations ELECTRICAL WIRING Inner wall (concealed) Outer wall Outer wall (exposed) Caution - Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring regulations and guidance of each electric power company. WARNING Floor (fireproofing) Roof pipe shaft Penetrating portion on fire Be sure to have authorized electrical engineers do the electric work using special circuits in accordance with regulations and this... -
Page 23: Control Box And Connecting Position Of Wiring
CAUTION Control box and connecting position of wiring - Remove all of the screws at side panel and remove the panel by • Use the 2-core shield cables for communication cables. Never use pulling it forward. them together with power cables. - Connect communication cables between outdoor unit and indoor •... -
Page 24: Communication And Power Cables
Wiring of main power supply and equipment Communication and Power Cables capacity Communication cable - Types : shielding cable - Use a separate power supply for the Outdoor Unit and Indoor Unit. - Cross section : 1.0~1.5 mm - Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when proceeding with the wiring and - Maximum allowable temperature: 60 °C connections. -
Page 25: Field Wiring
WARNING Field Wiring • Indoor Unit ground wires are required for preventing electrical Single outdoor unit shock accident during current leakage, Communication disorder by noise effect and motor current leakage (without connection Outdoor to pipe). Power supply (3-phase 4-wire) • Don't install an individual switch or electrical outlet to [Outdoor Unit] disconnect each of indoor unit separately from the power (Main Switch) - Page 26 Example) Connection of power and communication cable For 0 Series 10HP/12HP Front view Right view Right side Front side Main power Insulation Terminal block sleeves Ground wire attachment Fix firmly Power/ not to be Ground displaced cable Main power Terminal ODU-IDU block Commun-...
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Page 27: Installation Of Io Module(Optional)
Installation of IO Module(optional) For 5 Series ① Assemble IO Module and bracket. 10HP / 12HP ② Fix the bracket on designated location with two clamp cords Right side Front side (105 mm). ③ Connect the connection wires according to the instructions. Main power (Please refer to Setting and Using Method) Insulation... -
Page 28: Automatic Addressing
Automatic Addressing Setting the function Select the mode/function/option/value using ‘▶’, ‘◀’ Button and The address of indoor units would be set by Automatic Addressing confirm that using the ‘●’ button after DIP switch No.5 is turned on. - Wait for 3 minutes after supplying power. (Master and Slave outdoor units, indoor units) - Press RED button of the outdoor units for 5 seconds. -
Page 29: Group Number Setting
Group Number setting Function setting Switch control Function Group Number setting for Indoor Units Switch(Phase) Switch(Bottom) oP1(mode) oP2(mode) - Confirm the power of whole system(Indoor Unit, Outdoor Unit) is OFF, otherwise turn off. Right Left Not operate Cooling Cooling Right Right Not operate Heating... -
Page 30: Night Low Noise Function
Night Low Noise Function Snow removal & rapid defrost In cooling mode, this function makes the ODU fan operate at low RPM Mode setting method to reduce the fan noise of ODU at night which has low cooling load. Master unit PCB DIP switch on : No.5 Night low noise function setting method Select the mode using ‘▶’, ‘◀’... -
Page 31: Priority Heating Operation
Priority Heating Operation Setting the function Select the mode/function/option/value using ‘▶’, ‘◀’ Button and This is the function that gives priority to the hot water supply operation confirm that using the ‘●’ button after DIP switch No.5 is turned on. (heating) for the model that cannot simultaneously operate heating and cooling. - Page 32 Display Title Cause of Error Outdoor Unit Inverter Compressor CT Sensor Fault Outdoor Unit Inverter Compressor CT Sensor open or short Outdoor Unit Inverter Compressor1 Discharge Outdoor Unit Inverter Compressor Discharge Temperature Sensor open or Temperature Sensor Fault short Outdoor Unit Low Pressure Sensor Fault Outdoor Unit Low Pressure Sensor open or short Outdoor Unit High Pressure Sensor Fault Outdoor Unit High Pressure Sensor open or short...
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Page 33: Caution For Refrigerant Leak
CAUTION FOR REFRIGERANT LEAK Calculate refrigerant concentration Total amount of replenished refrigerant in refrigerant facility (kg) The installer and system specialist shall secure safety against leakage = Refrigerant concentration (kg/m according to local regulations or standards. Capacity of smallest room The following standards may be applicable if local regulations are not whereindoor unit is installed (m (R410A) -
Page 34: Installation Guide At The Seaside
• Anti-corrosion product is a special specification and is shipped from the plant 45 days after the order is placed. * LG Special Guide is needed for Anti-corrosion model. 2) In case, to install the outdoor unit on the seaside, set up a windbreak not to be exposed to the sea wind. -
Page 35: Model Designation
Model Designation Product information • Product Name : Air conditioner • Model Name : Product Sales Name Model Factory Name ARUx***ySSz, ARUx***ySRz x = N(Heat Pump), V (Cooling only) y = L (3 Ø, 380-415 V, 50 Hz), G(1 Ø, 220-240 V, 50 Hz) z = Series No. - Page 37 LG Electronics Inc. 84, Wanam-ro, Seongsan-gu, Changwon-si, Gyeongsangnam-do, KOREA UK Importer : LG Electronics U.K. Ltd Velocity 2, Brooklands Drive, Weybridge, KT13 0SL Eco design requirement • The information for Eco design is available on the following free access website.
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