LG A8UW54GFA0 Installation Manual
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LG A8UW54GFA0 Installation Manual

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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.
Multi Type
MFL68280103
Rev.04_122120
Copyright © 2015 - 2020 LG Electronics Inc. All Rights Reserved.
www.lghvac.com
www.lg.com

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  • 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. Multi Type www.lghvac.com www.lg.com MFL68280103 Rev.04_122120 Copyright © 2015 - 2020 LG Electronics Inc. All Rights Reserved.
  • Page 2 FLEX MULTI SPLIT INSTALLATION INSTRUCTIONS WARNING Do not turn on the breaker or power under condition that front panel, cabinet, top cover, control box cover are removed or opened. Otherwise, it may cause fire, electric shock, explosionor death. SPECIAL WARNINGS...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS INSTALLATION PARTS PROVIDED SAFETY INSTRUCTIONS INSTALLATION OF INDOOR, OUTDOOR UNIT Select the best location Seaside Applications and Installation Seasonal Wind And Cautions In Winter Piping length and elevation INSTALLATION Connecting the piping How To Fix Wiring Connection Conduit connection Ceiling dimension and hanging bolt location...

  • Page 4: Installation Parts Provided

    Installation Parts Provided Installation Parts Provided [Wall mounted / ART COOL Mirror] Type 1 Type 2 Type 3 Type 4 Installation plate Installation plate Installation plate Installation plate Type "B" screw Type "B" screw Type "B" screw Type "C" screw Type "B"...

  • Page 5: Safety Instructions

    Safety Instructions Safety Instructions The following safety guidelines are intended to prevent unforeseen risks or damage from unsafe or incorrect operation of the appliance. The guidelines are separated into ‘WARNING’ and ‘CAUTION’ as described below. This symbol is displayed to indicate matters and operations that can cause risk. Read the part with this symbol carefully and follow the instructions in order to avoid risk.
  • Page 6 Safety Instructions • Use caution when unpacking and installing. - Sharp edges may cause injury. • Use a vacuum pump or Inert (nitrogen) gas when doing leakage test or air purge. Do not compress air or Oxygen and Do not use Flammable gases. Otherwise, it may cause fire or explosion.
  • Page 7 Safety Instructions CAUTION Installation • Install the drain hose to ensure that drain can be securely done. - Otherwise, it may cause water leakage. • Install the product so that the noise or hot wind from the outdoor unit may not cause any damage to the neighbors.

  • Page 8: Installation Of Indoor, Outdoor Unit

    Installation of Indoor, Outdoor Unit Installation of Indoor, Outdoor Unit Read completely, then follow step by step. Select the best location Indoor unit 1. Do not have any heat or steam near the unit. [Wall mounted / ART COOL Mirror] 2.
  • Page 9 Installation of Indoor, Outdoor Unit [Vertical Air Handling Unit] More than 350 (13-25/32) More than 600 (23-5/8) clearance from access panels for Service More than More than 250 (9-27/32) 250 (9-27/32) More than 350 (13-25/32) Unit: mm(inch) Outdoor unit 1. If an awning is built over the unit to prevent direct sunlight or rain exposure, make sure that heat radiation from the condenser is not more than...

  • Page 10: Seaside Applications And Installation

    Installation of Indoor, Outdoor Unit Seaside Applications and Installation CAUTION 1. Air conditioners should not be installed in areas where corrosive gases, such as acid or alkaline gas, are produced. 2. Do not install the product where it could be exposed to sea wind (salty wind) directly. It can result corrosion on the product.

  • Page 11: Seasonal Wind And Cautions In Winter

    Installation of Indoor, Outdoor Unit Seasonal Wind And Cautions In Winter - Sufficient measures are required in a snow area or severe cold area in winter so that product can be operated well. - Get ready for seasonal wind or snow in winter even in other areas. - Install a suction and discharge duct not to let in snow or rain.
  • Page 12 Installation of Indoor, Outdoor Unit Calculation method for total capacity index = sum up the capacity index of connected indoor units. h Total capacity index = [Sum of all VAHU & Ceiling Concealed Duct (High Static) type indoor units capacity (if any)] x 1.3 + Sum of all other indoor unit’s capacity h The multiplier(1.3) is only necessary for calculation of combination ratio.
  • Page 13 Installation of Indoor, Outdoor Unit Distributor Piping Type Unit : m(ft) Min length of Max Elevation Outdoor Unit Max total length Max length Max length Max length each pipe Between each Elevation Combination Capacity of all pipes of each (Main / indoor unit and Between of indoor...

  • Page 14: Installation

    Installation Installation [Wall mounted / ART COOL Mirror] Connecting the piping # Standard / Artcool Mirror Type 1. Prepare the indoor unit's piping and drain hose for installation through the wall. 2. Remove the plastic tubing retainer(see the illustration on the right) and pull the tubing and drain hose away from chassis.
  • Page 15 Installation # Standard Libero / Artcool Libero Type 1. Pull the screw cap at the bottom of the indoor unit 2. Remove the chassis cover from the unit by loosing screws Chassis cover Indoor unit back side view 3. Pull back the tubing holder. Pipe Port 4.
  • Page 16 Installation Connecting the piping to the indoor unit and drain hose to drain pipe. 1. Align the center of the pipes and Indoor unit tubing Flare nut Pipes sufficiently tighten the flare nut by hand. 2. Tighten the flare nut with a wrench. Open-end wrench (fixed) Outside diameter Torque...
  • Page 17 Installation Wrap the insulation material around the Plastic bands Insulation material connecting portion. 1. Overlap the connection pipe insulation and the indoor unit pipe heat insulation material. Bind them together with vinyl tape so that there is no gap. Indoor unit pipe Connection pipe 2.

  • Page 18: How To Fix

    Installation Installation of filters 1) Detach two attached tapes from the plasma filter. Plasma Filter How To Fix The wall you select should be strong and solid enough to prevent vibration 1. Mount the installation plate on the wall with type "A"...

  • Page 19: Wiring Connection

    Installation Wiring Connection 1. Connect the wires to the terminals on the control board individually according to the outdoor unit connection. • Ensure that the color of the wires of outdoor unit and the terminal No. are the same as those of indoor unit respectively.

  • Page 20: Ceiling Dimension And Hanging Bolt Location

    Installation [Ceiling Cassette Type] Ceiling dimension and hanging bolt location • The dimensions of the paper model for installation are the same as those of the ceiling opening dimensions. Ceiling Ceiling board Level gauge • Select and mark the position for fixing bolts and piping 585~660(23 1/16~26) (Ceiling Opening) hole.

  • Page 21: How To Fix

    Installation How to Fix Ceiling Keep the length of the bolt Hanging bolt from the bracket to 40 mm(1-9/16 inch) (W3/8 or M10) Flat washer for M10 Air Conditioner body Air Conditioner body Air Conditioner body (W3/8 or M10) (accessory) Ceiling board Ceiling board Spring washer...

  • Page 22: Installation Of Wired Remote Controller(Optional)

    Installation Installation of Wired Remote Controller(Optional) 1. Please fix tightly using provided screw after placing remote controller setup board on the place where you like to setup. - Please set it up not to bend because poor setup could take place if setup board bends. Please set up remote controller board fit to the reclamation box if there is a reclamation box.
  • Page 23 Installation 3. Please fix remote controller upper part into the <Connecting order> setup board attached to the surface of the wall, as the picture on the right, and then, connect with setup board by pressing lower part. Wall Wall - Please connect not to make a gap at the remote controller Side Side and setup board’s upper and lower, right and left part.

  • Page 24: Installation Of Decorative Panel

    Installation Installation of Decorative Panel The decorative panel has its installation direction. Before installing the decorative panel, always remove the paper template. 1. Remove the packing and take out air inlet grille from front panel. Front grille 2. Remove the Corner covers of the panel. Coner cover 3.
  • Page 25 Installation 5. Fit the corner covers. 6. Open two screws of control panel cover. Screw 7. Connect one display connector and two vane control connectors of front panel to indoor unit PCB. The position marking on PCB is as: Display connector : CN-DISPLAY Vane control connector: CN-VANE 1,2 CN-VANE 1,2 CN-DISPLAY 8.

  • Page 26: Drain Piping

    Installation CAUTION Install certainly the decorative panel. Cool air leakage causes sweating. ⇨ Water drops fall. Good example Bad example Air conditioner unit Air conditioner Cool air leakage unit (no good) Ceiling Ceiling board board Decorative Decorative panel panel Fit the insulator (this part) and be careful for cool air leakage HEAT INSULATION 1.
  • Page 27 Installation [Ceiling Concealed Duct/Ceiling Cassette Type] • Drain piping must have down-slope (1/50 to 1/100): be Upward sure not to provide up-and-down slope to prevent Pipe clamp routing reversal flow. not allowed • During drain piping connection, be careful not to exert Indoor unit extra force on the drain port on the indoor unit.
  • Page 28 Installation Attention 1. Possible drain-head height is up to 700 mm (27 9/16 inch). So, it must be installed below 700 mm(27 9/16 inch). 1/50~1/100 MAX 700 mm 2. Keep the drain hose downward up to (27 9/16 inch) 1/50~1/100 inclination. Prevent any upward flow or reverse flow in any part.

  • Page 29: Flaring Work And Connection Of Piping

    Flaring Work and Connection of Piping Flaring Work and Connection of Piping Flaring work Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the Copper Slanted Uneven Rough following procedure. tube 90° 1) Cut the pipes and the cable. n Use the accessory piping kit or the pipes purchased locally.

  • Page 30: Connection Of Piping - Outdoor

    Flaring Work and Connection of Piping Connection of piping - Outdoor Align the center of the piping and sufficiently tighten the flare nut by hand. Connecting pipe order 1) ROOM A~C gas side pipe 2) ROOM A~C liquid side pipe Ø...
  • Page 31 Flaring Work and Connection of Piping • For the units with capacity more than 48 kBtu/h, the installation piping is connectable in four Continuous directions.(refer to figure 1) • When connecting in a downward direction, knock out the knockout hole of the base pan. Torque wrench (refer to figure 2)
  • Page 32 Flaring Work and Connection of Piping Branch * For detailed dimensions, refer to the printed materials enclosed at the time of purchase the branch pipe. [unit: mm] Model Gas Pipe Liquid Pipe Ø 19.05 Ø 9.52 Ø 19.05 Ø 9.52 PMBL5620 Ø...

  • Page 33: Installation

    Flaring Work and Connection of Piping Installation • This unit may be installed suspended from the ceiling or mounted on the wall. • This unit may be installed horizontally , as shown in the diagram below.(Side B is facing up) However, it may be freely installed in any direction forward or back, and to the sides.

  • Page 34: Installation Of The Main Unit

    Flaring Work and Connection of Piping Installation of The Main Unit NOTICE • This unit has two different installation types: (1) Ceiling-suspended type and (2) wall-mounted type. • Choose the proper installation pattern according to the location of installation. • The installation location for printed wiring board can be changed.

  • Page 35: Connecting The Cable Between Indoor Unit, Distributor Unit And Outdoor Unit

    Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit Connect the cable to the Indoor unit Connect the cable to the indoor unit by connecting the wires to the terminals on the control board individually according to the outdoor unit connection.

  • Page 36: Connect The Cable To The Distributor Unit

    Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit u Precautions when laying power and ground wiring Use round pressure terminals for connections to the power terminal block. When laying ground wiring, you must use round pressure terminals. Power wire(Ground wire) Round pressure terminal When none are available, follow the instructions below.
  • Page 37 Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit In Case of 3 rooms WARNING Do not use tapped wires, stand wires, extension A room cords, or starbust connections, as they may B room cause overheating, electrical shock, or fire. C room CN-PWR Connection wire for indoor units...

  • Page 38: Connect The Cable To The Outdoor Unit

    Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit Connect the cable to the Outdoor unit 1. Remove the control cover from the unit by loosening the screw. Connect the wires to the terminals on the control Power Power Power board individually as the following.
  • Page 39 Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit 60 kBtu/h class Power cord terminal Connecting cable terminal Cord clamp Cord clamp * Make sure the rubber bushes are Properly used in knock-out holes after connecting main power cable. NOTICE 1.

  • Page 40: Connection Method Of The Connecting Cable(Example)

    Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit Connection method of the connecting cable(Example) (1) Remove the side panel and knockouts of conduit panel. (for low voltage line) (2) Pull out connection cable through conduit. Conduit (filed supply) (3) After conduit to the panel, fix nut to the opposite Lock nut (field supply)

  • Page 41: Checking The Drainage, Insulating The Pipe And Special Piping Applications

    Checking the Drainage, Insulating the Pipe and Special Piping Applications Checking the Drainage, Insulating the Pipe and Special Piping Applications Checking the drainage 1. Remove the Air Filter. 2. Check the drainage. • Spray one or two glasses of water upon the evaporator.

  • Page 42: Air Purging And Evacuation

    Air Purging and Evacuation Air Purging and Evacuation Air and moisture remaining in the refrigerant system have undesirable effects as indicated below. 1. Pressure in the system rises. 2. Operating current rises. 3. Cooling(or heating) efficiency drops. 4. Moisture in the refrigerant circuit may freeze and block capillary tubing. 5.

  • Page 43: Evacuation

    Air Purging and Evacuation Evacuation 1. Connect the charge hose end described in the preceding steps to the vacuum pump to evacuate the tubing and indoor unit. Confirm the "Lo" knob of the manifold valve is Indoor unit open. Then, run the vacuum pump. Manifold valve The operation time for evacuation varies with Pressure...

  • Page 44: Charging

    Charging Charging n If installed total piping length is more than standard total length, additional refrigerant charging is necessary. Below standard total piping length, additional refrigerant charging is not required. Multiple Piping Models Unit:m(ft) Standard Total Piping Outdoor Unit Max total length of all Additional Refrigerant Max length of each Min length of each...
  • Page 45 CF = Max. number of connectable indoor unit – Total number of connected indoor unit • Total main pipe(A+B+C)=98ft • Each branch pipe a = 33 ft b = 26 ft Ex) A8UW54GFA0, A8UW60GFA0 c = 16.4 ft d = 10 ft e = 33 ft v Additional Charge = ((98-16.4)×0.55 + (33-16.4)×0.22...

  • Page 46: Installation Pi485

    Installation PI485 Installation PI485 Fix the PI485 PCB as shown in Fig. Detailed installation method refer to PI485 Installation Manual. 18 kBtu/h, 24 kBtu/h 30 kBtu/h, 36 kBtu/h This label is should be applied in the location This label is should be applied in the location where where LGAP(Sub PCB for Central Controller is...

  • Page 47: Test Running

    Test Running Test Running - Check that all tubing and wiring have been properly connected. - Check that the gas and liquid side service valves are fully open. Prepare remote control Remove the battery cover by pulling it according to the arrow direction.Insert new batteries making sure that the (+) and (–) of battery are installed correctly.

  • Page 48: Function

    Function Function DIP S/W Setting If you set the DIP Switch when power is on, the change in setting is not applicable. The changing setting is enabled only when Power is reset. 18/24/30/36/48/54 k 60 k DIP Switch Function 1 2 3 4 5 Normal Operation (No Function) Forced Cooling Operation Wiring Error Check...

  • Page 49: Forced Cooling Operation

    Function 18/24(1Ø) kBtu/h 30/36(1Ø) kBtu/h 18(1Ø) kBtu/h 24(1Ø) kBtu/h 60(1Ø) kBtu/h DIP SW1 DIP SW1 48/54(1Ø) kBtu/h DIP_SW01D Forced Cooling Operation Adding the refrigerant in winter. Setting Procedure 1. Set the DIP Switch as follow after shutting the power source down. 2.

  • Page 50: Wiring Error Check

    Function Wiring Error Check You can check whether or not the wiring is correct. Setting Procedure 1. Set the DIP Switch as follow after shutting the power source down. 2. Reset the power. 3. Check that the Re and Green LED of PCB are on during work. (The indoor unit is operated by force.) 4.

  • Page 51: Night Quiet Mode

    Function Saving Power Consumption Current level. Phase 1Ø Model 18/24 k 30/36 k 48/54/60 k Step 1(A) Step 2(A) Saving Power Consumption with Mode Lock. Saving Power Saving Power Consumption (step 1) Consumption (step 1) + Mode Lock (Cooling) + Mode Lock (Heating) Saving Power Saving Power Consumption (step 2)

  • Page 52: Mode Lock

    Function Mode Lock Setting Procedure 1. Set the DIP Switch as follow after shutting the power source down. Only Cooling Mode Only Heating Mode 2. Reset the power. Mode Lock with Night Quiet Mode Mode Lock (Cooling) Mode Lock (Cooling) + Night Quiet Mode + Night Quiet Mode (step 1)

  • Page 53: Pcb Display(18/24/60 K Model Only)

    Function PCB Display(18/24/60 k Model Only) It is useful to check the cycle data without LGMV. Operating Method Whenever you push the Tact Switch, the cycle information will be shown as below. h After 1 page is displayed, subsequently 2 page is displayed. Tact S/W Display Item...

  • Page 54: Max Combination Capacity

    Sum up the capacity of all indoor unit, but high static duct and VAHU type indoor unit capacity multiplier 1.3 times in which multiplier is unless only HSD/VAHU are connected Ex) 1. Outdoor unit : A8UW54GFA0(LMU540HV)(connectable maximum capacity is 73 kBtu) Indoor unit: AMNW24GBGA0[LMHN240HV], AMNW36GBGA0[LMHN360HV] (24+36) x 1.2 = 60 x 1.2 = 72 kBtu : this combination is acceptable.
  • Page 55 1. Please call the installing contractor of your product, as warranty service will be provided by them. 2. If you have service issues that have not been addressed by the contractor, please call 1-888-865-3026. CANADA Service call Number # : (888) LG Canada, (888) 542-2623...

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