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LG L5UC728FA0 Installation Manual

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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.
TYPE : Multi
P/NO : 3828A20403Q
www.lg.com

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Summary of Contents for LG L5UC728FA0

  • Page 1 • 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. TYPE : Multi www.lg.com P/NO : 3828A20403Q...

  • Page 2: Table Of Contents

    Multi Type Air Conditioner Installation Manual TABLE OF CONTENTS Required Tools Installation Requirements Installation Parts Provided ........3 Safety Precautions ............4 o Level gauge Installation of Indoor, Outdoor Unit ......7 o Screw driver Wall mounted Type..........11 o Electric drill Duct Type..............15 o Hole core drill (ø50mm) o Horizontal meter CST Type ..............21...

  • Page 3: Installation Parts Provided

    Installation Parts Provided Installation Parts Provided Indoor Unit Air filters Air outlet vents Air intake vents Remote Controller intake vents Air Outlet vents Air intake vents Air filters Remote Controller Air outlet vents Remote Controller Outdoor Unit Air Outlet more than� 90cm more than�...

  • Page 4: Safety Precautions

    Safety Precautions Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. WARNING This symbol indicates the possibility of death or serious injury.
  • Page 5 Safety Precautions Do not modify or extend the power cable. Be cautious when unpacking and installing the product. • There is risk of fire or electric shock. • Sharp edges could cause injury. Be especially careful of the case edges and the fins on the condenser and evaporator.
  • Page 6 Safety Precautions CAUTION n Installation Always check for gas (refrigerant) leakage after Install the drain hose to ensure that water is installation or repair of product. drained away properly. • Low refrigerant levels may cause failure of • A bad connection may cause water leakage. product.

  • Page 7: 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 1. Indoor unit Wall mounted Type • Do not have any heat or steam near the unit. More than More than 20 cm •...
  • Page 8 Installation of Indoor, Outdoor Unit CST Type • There should not be any heat source or steam near the unit. • There should not be any obstacles to prevent 20 or more Ceiling the air circulation. Ceiling Board Ceiling Board •...

  • Page 9: Piping Length And Elevation

    Installation of Indoor, Outdoor Unit Piping length and elevation Distributor Type Max Main Pipe Total Branch Max Branch Max Elevation Indoor - Indoor Model Total Length Length (A/B) Pipe Length Pipe Length (h1/h2) Elevation (h3) With Distributor A = 30 h1=30 L5UC7 None Distributor...

  • Page 10: Refrigerant Piping

    Installation of Indoor, Outdoor Unit Refrigerant piping Perform the work according to the Service Manual or Installation Guide. • Use two spanners when connecting the Flared connection (Union) Indoor refrigerant pipe to the unit. • Make a bend with a radius as large as Use a seemliness tube possible.

  • Page 11: Wall Mounted Type

    Installation of Indoor, Outdoor Unit Indoor unit installation Wall Mounted Type 1. Route the indoor tubing and the drain hose in the direction of rear left or right Drain hose 2. Tape the tubing, drain hose and the connecting cable. Be sure that the drain hose is located at the lowest side of the bundle.
  • Page 12 Installation of Indoor, Outdoor Unit n Indoor unit installation 1. Hook the indoor unit onto the upper portion of the installation plate.(Engage the two hooks Connecting of the rear top of the indoor unit with the cable upper edge of the installation plate.) Ensure that the hooks are properly seated on the Drain hose installation plate by moving it left and right.

  • Page 13: Good Case

    Installation of Indoor, Outdoor Unit 3. Bundle the piping and drain hose together by Wrap with vinyl tape wrapping them with vinyl tape over the range Pipe within which they fit into the rear piping housing section. Vinyl tape(wide) Drain hose CAUTION: Installation Information (For right piping) For right piping, follow the instruction below.
  • Page 14 Installation of Indoor, Outdoor Unit n How to fix installation plate The wall you select should be strong and solid enough to prevent vibration Installation Plate 1. Mount the installation plate on the wall with type "A" screws. If mounting the unit on a concrete wall, use anchor bolts.

  • Page 15: Duct Type

    Installation of Indoor, Outdoor Unit Duct Type n Installation of Unit Install the unit above the ceiling correctly. CASE 1 POSITION OF SUSPENSION BOLT • Apply a joint-canvas between the unit and duct to absorb unnecessary vibration. • Apply a filter Accessory at air return hole. (Unit:mm) Dimension F (G) H...
  • Page 16 Installation of Indoor, Outdoor Unit • Select and mark the position for fixing bolts. • Drill the hole for set anchor on the face of ceiling. • Insert the set anchor and washer onto the suspension bolts for locking the suspension Old building New building bolts on the ceiling.
  • Page 17 Installation of Indoor, Outdoor Unit Caution for gradient of unit and drain piping Lay the drain hose with a downward inclination so water will drain out. Thermal insulator • Always lay the drain with downward (Local supply) inclination (1/50 to 1/100). Drainage pipe Prevent any upward flow or reverse flow (Local supply)

  • Page 18: Refrigerant Pipe

    Installation of Indoor, Outdoor Unit Insulation, others Insulate the joint and tubes completely. THERMAL INSULATION All thermal insulation must comply with local requirement. Union for liquid pipe Thermal insulator for refrigerant pipe (Local supply) Thermal insulator for Refrigerant pipe and thermal piping(Local supply) insulator(Local supply) Hose clip for thermal insulator...
  • Page 19 Installation of Indoor, Outdoor Unit installation of remote control box Install the remote control box and cord correctly. POINT OF REMOTE CONTROLLER INSTALLATION • Although the room temperature sensor is in the indoor unit, the remote control box should be installed in such places away from direct sunlight and high humidity. INSTALLATION OF THE REMOTE CONTROL BOX ROUTING OF THE REMOTE CONTROL CORD •...

  • Page 20: Wired Remote Controller Installation

    Installation of Indoor, Outdoor Unit Wired remote controller installation • Since the room temperature sensor is in the remote controller, the remote controller box should be installed in a place away from direct sunlight, high humidity and direct supply of cold air to maintain proper space temperature.

  • Page 21: Cst Type

    Installation of Indoor, Outdoor Unit CST Type • The dimensions of the paper model for installing are the same as those of the ceiling opening dimensions. • Select and mark the position for fixing bolts 600 (Ceiling opening) and piping hole. 39.5 521(Hanging bolt) 39.5...

  • Page 22: The Indoor Unit Installation

    Installation of Indoor, Outdoor Unit NOTICE� • Thoroughly study the following installation locations: 1. In such places as restaurants and kitchens, considerable amount of oil steam and flour adhere to the turbo fan, the fin of the heat exchanger and the drain pump, resulting in heat exchange reduction, spraying, dispersing of water drops, drain pump malfunction, etc.

  • Page 23: Remote Controller Installation

    Installation of Indoor, Outdoor Unit • The following parts is option. • Drill the piping hole on the wall slightly tilted to the Hanging Bolt - W 3/8 or M10 outdoor side using a Ø 70 hole-core drill. - W 3/8 or M10 Spring Washer - M10 Wall...

  • Page 24: Wired Remote Control Installation

    Installation of Indoor, Outdoor Unit n WIRED REMOTE CONTROL INSTALLATION DISASSEMBLING • Separate the under plate from Remote control box. Front case Lever carefully Remote control • Fix the cord clamps on the wall by the box open box body using a screw ø...

  • Page 25: Wiring Connection

    Installation of Indoor, Outdoor Unit n Wiring Connection • Open the control box cover and connect the Remote controller cord and Indoor power Indoor power cord Control box cover Remote controller cord Screws [Air inlet side view] Installation Manual 25...

  • Page 26: Installation Of Decorative Panel

    Installation of Indoor, Outdoor Unit n Installation of Decorative Panel The decorative panel has its installation Before installing the decorative panel, direction. always remove the paper template. 1. Temporarily fix two decorative panel fixing screws (hexagon M5 screw) on the unit body. (Tighten by amount 10mm in length.) The fixing screws (hexagon M5 screw) are included the decorative panel box.

  • Page 27: Indoor Unit Drain Piping

    Installation of Indoor, Outdoor Unit 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...

  • Page 28: Heat Insulation

    Installation of Indoor, Outdoor Unit HEAT INSULATION 1. Use the heat insulation material for the refrigerant piping which has an excellent heat- resistance (over 120°C). Fastening band 2. Precautions in high humidity (accessory) circumstance: This air conditioner has been tested according to the "KS Standard Conditions with Mist"...

  • Page 29: Flaring Work And Connection Of Piping

    Flaring Work and Connection of Piping Flaring Work and Connection of Piping Flaring work Preparation of Piping Main cause of gas leakage is defect in flaring Copper work. Carry out correct flaring work in the Slanted Uneven Rough tube 90° following procedure.

  • Page 30: Piping Connection

    Flaring Work and Connection of Piping 5. Check Smooth all round • Compare the flared work with figure below. Inside is shining without scratches • If flare is noted to be defective, cut off the flared section and do flaring work again. = Improper flaring = Inclined Surface...
  • Page 31 Flaring Work and Connection of Piping 2. Align the center of the pipings and sufficiently Outdoor unit tighten the flare nut by hand B-UNIT 3. Finally, tighten the flare nut with torque Liquid side piping A-UNIT wrench until the wrench clicks. n When tightening the flare nut with torque wrench, ensure the direction for tightening Liquid side piping...
  • Page 32 Flaring Work and Connection of Piping Accessory For Installation * Below mentioned "P/NO" is assembly p/no for the respective models. and this part no. Exist in the respective "Model" Model P/No. Figure Guide LMNC(H)246BHA0 LMNC(H)246LTL(A)0 5162A20011E LMNC(H)246TFC(A)0 LMNC(H)246BYG0 Use this socket, when ID Unit is joined with BD Unit(gas side) Use this Y branch, when ID Unit is joined with LMNC(H)306BGA0...
  • Page 33 Outdoor unit Indoor unit side side “a” “b” “c” 36K Indoor 48K Indoor 48K Indoor Outdoor unit L4UC608FA0 L5UC728FA0 L6UH728FA0, L8UC(H)1008FA0 Outdoor unit Indoor unit side side “a” “b” “c” 48K Indoor Outdoor unit L5UC728FA1 / L8UC1008FA1 Installation Manual 33...
  • Page 34 Flaring Work and Connection of Piping Installation Example • Connection of Piping and Wiring for 30k, 36k Indoor Unit *Outdoor Uint L8UH1008FA0 L8UC1008FA0 L8UC1008FA1 PMBD5440L Case 1 Case 2 Room Indoor Unit Gas side Liquid side Wiring Room Indoor Unit Gas side Liquid side Wiring...
  • Page 35 Flaring Work and Connection of Piping • Connection of Piping and Wiring for 48k Indoor Unit *Outdoor Uint L8UC1508FA1 Y CONNECTOR (LIQUID PIPING) SOCKET (GAS PIPING) 9.52 12.7 6.35 19.05 DISTRIBUTOR DISTRIBUTOR INDOOR UNIT FEATURE & SIZE INDOOR UNIT 6.35 P/NO:5162A20001K P/NO:5211A22704A INDOOR UNIT :...
  • Page 36 Flaring Work and Connection of Piping Models: L5UC728FA0(1), L6UH728FA0, L8UC(H)1008FA0(1) • CASE 1(4ROOM/CYCLE) Ø12.7/6.35 *Outdoor Uint L8UH1008FA0 L8UC1008FA0 L8UC1008FA1 PMBD5440L 1 Circuit Ø19.05/9.52 2 Circuit Ø19.05/9.52 PMBD5440L Ø12.7/6.35 • CASE 2(3ROOM/CYCLE) Ø12.7/6.35 *Outdoor Uint L8UH1008FA0 L8UC1008FA0 PMBD5430L L8UC1008FA1 Ø15.88/6.35 1 Circuit Ø19.05/9.52...
  • Page 37 Flaring Work and Connection of Piping • CASE 1(2ROOM/CYCLE) Ø15.88/6.35 * Outdoor PMBD5420L L8UH1008FA0 L8UC1008FA0 L8UC1008FA1 1 Circuit Ø19.05/9.52 Detail Work 2 Circuit Ø12.7/6.35 Ø19.05/9.52 PMBD5430L • CASE 2(1ROOM/CYCLE) Ø15.88/6.35 * Outdoor L8UH1008FA0 L8UC1008FA0 1 Circuit Ø19.05/9.52 Ø19.05/9.52 2 Circuit Short tube (in 48k indoor unit) •...
  • Page 38 Flaring Work and Connection of Piping • CASE 4(1ROOM/CYCLE) – L5UC728FA0 1 Circuit Ø19.05/9.52 2 Circuit Ø15.88/6.35 Short tube (in L5UC728FA0 Outdoor unit) • CASE 5(1ROOM/CYCLE) – Only L5UC728FA1 1 Circuit Ø19.05/9.52 2 Circuit Ø15.88/6.35 Short tube (in L5UC728FA1 Outdoor unit) •...
  • Page 39 Flaring Work and Connection of Piping Models: L8UC1508FA1 • CASE 1 PMBD5430L Ø25.4/Ø12.7 1 Circuit Y branch Detail Work 2 Circuit Ø19.05/9.52 PMBD5430L • CASE 2 PMBD5440L Ø25.4/Ø12.7 1 Circuit Y branch Detail Work 2 Circuit Ø19.05/Ø9.52 PMBD5430L Installation Manual 39...
  • Page 40 Flaring Work and Connection of Piping • CASE 3 PMBD5440L 1 Circuit Ø25.4/Ø12.7 2 Circuit Ø19.05/Ø9.52 PMBD5440L ■ Connection between BD and OD unit in case of L8UC1508FA1 In order to connect BD units to L8UC1508FA1 OD unit, the following installation guide should be observed. Ø19.05 60k cycle Ø19.05...
  • Page 41 Flaring Work and Connection of Piping Installing the short tube(L5UC728FA1 and L8UC1008FA1 only) PARTS ACCESSORIES • NAME : SHORT TUBE • NAME : INSULATION TUBE • NAME : INSULATION BUTYL • P/NO : 5211A21343E • P/NO : 5410A30055A • P/NO : 5410A20111R 2) INSTALLATION METHOD ☞...

  • Page 42: Connecting The Cable Between Indoor Unit And Outdoor Unit

    Connecting the Cable between Indoor Unit and Outdoor Unit Connecting the Cable between Indoor 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 43: Connect The Cable To The Outdoor Unit

    Connecting the Cable between Indoor Unit and Outdoor Unit Connect the cable to the Outdoor unit. 1. Remove the cover control from the unit by loosening the screw. Connect the wires to the terminals on the control board individually as the following. 2.

  • Page 44: Checking The Drainage, Forming The Pipings And Long Pipe Setting

    Checking the Drainage, Forming the Pipings and Long Pipe Setting Checking the Drainage, Forming the Pipings and Long Pipe Setting Checking the drainage To check the drainage. 1. Pour a glass of water on the evaporator. 2. Ensure the water flows through the drain hose of the indoor unit without any leakage and goes out the drain exit.

  • Page 45: Forming The Piping

    Checking the Drainage, Forming the Pipings and Long Pipe Setting Forming the piping Form the piping by wrapping the Seal a small connecting portion of the indoor opening around unit with insulation material and the pipings with Plastic gum type sealer. secure it with two kinds of vinyl band Taping...

  • Page 46: 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 47: Finishing The Job

    Air Purging and Evacuation Soap water method 1. Remove the caps from the 2-way and 3-way valves. Hexagonal wrench 2. Remove the service-port cap from the 3-way valve. 3. To open the 2-way valve turn the valve stem Hexagonal Hexagonal wrench wrench counterclockwise approximately 90°, wait for about...

  • Page 48: Test Running

    Test Running Test Running 1. Check that all tubing and wiring have been properly connected. 2. 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 49: Optional Operation - Duct Type

    Optional Operation - Duct Types Optional Operation - Duct Types Group Control It operates maximum 16 Units by only one Wired Remote Controller, and each Unit starts sequentially to prevent overcurrent. Main PCB Indoor Unit 1 Indoor Unit 2 Indoor Unit 16 Terminal(Local Supply) Terminal(Local Supply) Terminal(Local Supply)
  • Page 50 Optional Operation - Duct Types E.S.P.(External Static Pressure) Setting Open the rear cover of the wired remote-controller to set the mode. Select one of three selectable modes as follows. n Without Zone System 1. Position V-H, F-H: • This position sets the maximum E.S.P as a default set. 2.
  • Page 51 Optional Operation - Duct Types How to Set E.S.P? Procedure of RPM change: Ex) External Static pressure is 4mmAq for Model Name "LMNH246BHA0" • To protect the unit, compressor is designed to be off during E.S.P. setting. Push the "On/Off" button. The unit will start.
  • Page 52 Optional Operation - Duct Types [Table. 1] Static Pressure(mmAq) Chassis Capacity Step(Hi/Med/Lo) Setting Value 16.5 CMM 18 kBtu/h 14.5 CMM 13 CMM 18 CMM 24 kBtu/h 16.5 CMM 14 CMM 26.5 CMM 30 kBtu/h 23 CMM 20 CMM 32 CMM 36 kBtu/h 29 CMM 26.5 CMM...

  • Page 53: Troubles And Solutions

    Optional Operation - Duct Types External Static Pressure & Air Flow (For 48K BE Chassis Model) Static Pressure(mm Aq) Model Name Step High 48.5 46.5 43.5 LMNH/C486BEA0 41.5 39.5 36.5 37.5 34.5 1) The above table shows the correlation of External Static Pressure & AIR FLOW. 2) Duct work must be designed within the range of on installing the unit.

  • Page 54: Optional Operation - Cst Type

    Optional Operation - CST Type Optional Operation - CST Type 1. Two Thermistor System (1) Open the rear cover of the wired remote-controller to set the mode. (2) Select one of three selectable modes as follows. • Position 1: The room temperature is controlled by the thermistor of the main body. •...
  • Page 55 Optional Operation - CST Type 2. Adjusting air volume to the height of ceiling You can choose the RPM(or air volume) of indoor motor according to the height of ceiling to supply the comfortable atmosphere to consumers. Procedure 1. Choose the selectable position in the table after measuring the height of ceiling. Ceiling height Mode of slide switch Change of air volume...

  • Page 56: Wiring Design

    Optional Operation - CST Type 3. Group Control(Optional Wiring) • You can use a group control operation after connecting the brown and yellow wire of each air-conditioner. • Remove the resistor "OP 7" in remote controller. • It operates maximum 16 Units by only one Wired Remote Controller, and each Unit starts sequentially to prevent overcurrent.

  • Page 57: Combination Indoor Units

    L8UC1008FA0(1) L4UC608FA0 L8UC1508FA1 L4UH488FA0 L6UH728FA0 L8UH1008FA0 Capacity Number of connectible Indoor Units Model Type up to 5 for L5UC728FA0(1) Index Btu/h up to 4 up to 4 up to 8 up to 8 up to 6 for L6UH728FA0 9,000 12,000...

  • Page 58: Installation Guide At The Seaside

    3) Select a well-drained place. 1. If you can’t meet above guide line in the seaside installation, please contact LG Electronics for the additional anticorrosion treatment. 2. Periodic ( more than once/year ) cleaning of the dust or salt particles stuck on the heat exchanger by using water...

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