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LG MULTI F LMU183HV Installation Manual
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LG MULTI F LMU183HV Installation Manual

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Multi-Zone Heat Pump Systems
1.5 to 5 Tons
Dual and Tri-Zone
Multi F
MULTI
MULTI
INSTALLATION MANUAL
Quad-Zone
Multi F
F
F
MAX
OUTDOOR UNIT
Eight-Zone
Multi F MAX

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Summary of Contents for LG MULTI F LMU183HV

  • Page 1 MULTI MULTI OUTDOOR UNIT INSTALLATION MANUAL Multi-Zone Heat Pump Systems 1.5 to 5 Tons Dual and Tri-Zone Quad-Zone Eight-Zone Multi F Multi F Multi F MAX...
  • Page 2 For more technical materials such as submittals, catalogs, engineering, owner’s, best practices, building ventilation guide, 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

    Maintenance Recommendations ....................................96 Checklists and Worksheets....................................97-102 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 4: Safety Instructions

    Periodically check that the outdoor frame is not damaged. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 5 There is a risk of product failure. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 6 / or property damage. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 7 There is risk of unit failure. or will cause its appearance to deteriorate. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 8: Nomenclature

    • Compatible single zone IDU nomenclature is listed in the Single Zone Wall-Mounted IDU Engineering Manual. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 9: General Data

    Operation outside of Continuous Operating Range is subject to safety interruption. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 10 - 36,000 ODU (LMU363HV): 9k Wall Mounted IDU x 4 *Wall Mounted IDU FLA is 0.2 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 11 6. For LMU243HV Unit, ports A, B, and C are available. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 12 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 13 Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 14 Indoor Fan Motor (FLA) is based on the max. combination of IDUs. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 15 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 16 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 17 Piping lengths are equivalent. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 18 3. For PMBD3640 and PMBD3641 Units, Ports A, B, C, and D are Available. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 19 • Handle the outdoor unit with care. Keep the outdoor unit upright to avoid damaging inside components. • Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 20: Placement Considerations

    8. Consider tie-down requirements in case of high winds or where required by local codes. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 21 NOTE Ground advance. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 22 Standard Case 4 Minimum Standard Case 5 Minimum Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 23 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 24 Minimum 24" Minimum 24" Minimum 24" Minimum 40" Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 25 Installing Outdoor Units Indoors LG Multi F / Multi F MAX 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 26 4. If the louver open rate is too small or there is insufficient air flow Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 27 /min. / 2,119 ft. /min. = 231% (Within Allowable Limits) Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 28 • Install in an area where high-frequency electrical noise / electromagnetic waves will affect operation. Maintain proper distances between the Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 29 3. For PMBD3640 and PMBD3641 Units, Ports A, B, C, and D are Available. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 30 Figure 18: LMU601HV Outdoor Units. Unit: Inch Unit: Inch Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 31: Mounting / Anchoring

    Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 32 Bottom of Unit Bott Bottom View, Port End Facing Up Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 33: Lats

    Features All LG product design criteria have been loaded into the program, making LATS simple to use: double click or drag and drop the component choices. Build systems in Tree Mode where the refrigerant system can be viewed. Switch to a Schematic diagram to see the electrical and communications wiring.
  • Page 34 LATS can generate an Excel GERP report that can imported into the LG SOPS pricing and ordering system.
  • Page 35 A, B, C, D: Pipes from Outdoor Unit to Indoor Unit. Max. 49.2 feet Max. 24.6 feet Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 36 Branch Distribution Unit (ft., Multi F MAX systems only) Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 37: Selecting Copper Piping

    Always follow local codes when selecting and installing copper pipe and piping system components. Approved piping for use with LG HVAC products will be marked “R410 RATED” along the length of the pipe. Piping wall thickness must meet local code requirements and be approved for a maximum operating pressure of 551 psi. When bending piping, try to keep the number of bends to a minimum, and use the largest radii possible to reduce the equivalent length of installed piping;...

  • Page 38: Copper Expansion/Contraction

    ASTM B-88 Inches to feet conversion (12 in./ft.) Standards. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 39 2.00 2.00 2.50 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.40 5.75 6.50 7.00 7.25 7.50 www.engineeringtoolbox.com. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 40 2-1/2 3-1/2 R = Centerline Length of Pipe. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 41: Piping Handling

    1 hour. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 42: Refrigerant System Engineering

    Failure to do so will cause significant performance degradation. Proper leak checks must be performed. Using isolation valves does not automatically void any LG product warranty, however, a limited warranty will be voided in whole or part must any field supplied accessory fail in any way that causes product failure.
  • Page 43 ~12" – 19" Max. 12" Maximum 12" Max. 12" Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 44 Support Band Down Stop Hexagonal Nut Refrigerant Pipe Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 45 Pipe Sleeves at Penetrations LG recommends 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 Figure 42: Pipe Sleeve Options.

  • Page 46: Flaring And Brazing Procedures

    FLARING AND BRAZING PROCEDURES MULTI Flaring and Brazing Procedures One of the main causes of refrigerant leaks is a defective connection. For LG HVAC systems, the installer needs to know how perform both flared and brazed connections successfully. • •...
  • Page 47 • Protect isolation valves, electronic expansion valves, and other heat-sensitive control components from excessive heat with a wet rag or heat barrier spray. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 48: Installing Multi F Systems

    18,000 Btu/h: Low Static Duct, Four-Way Cassette, VAHU 24,000 Btu/h Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 49 Flare Flare Outdoor Indoor Unit Unit Connection Socket Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 50: Installing Multi F Max Systems

    Vapor Line Connection (in., OD) x Qty. Ø3/4 x 1 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 51 *No socket adapter is required if connected to Port D on the PMBD3641. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 52 4. After all the piping has been connected and the caps have been tightened, check for refrigerant gas leaks. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 53 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 54 Viewed from A in direction of arrow Within ± 3° Within ± 3° Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 55 5. Seal any openings in the wall that are around the piping. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 56: Condensate Drain Piping

    A leak test must be performed 24 hours after the drainage system has been installed. to the indoor unit type. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 57: Insulation

    Y-branch fitting and all run-out pipes are installed. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 58 The air conditioner factory insulation has been tested according to “ISO Conditions with Mist,” and it satisfies the requirements. If the system Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 59 Additional Insulation for Y-Branches Will be Required in Humid Environments. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 60: Electrical

    Wiring / Cable Clamps Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 61 WARNING NOTE • • Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 62 1Ø, 208-230V or time delay fuse • • Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 63 Ground Wiring Ground Wiring Outdoor Unit Outdoor Unit Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 64 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 65 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 66 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 67 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 68 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 69 • All wiring / cable must be firmly connected to its terminals. Loose wiring will result in unit malfunction. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 70 2(L2) 3(B) BD Unit (A) LMU601HV (60 kBtu/h) Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 71 Always refer to the circuit diagram on the inside of the outdoor unit control cover. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 72 Figure 94: PI-485 Board (Ap- pearance will differ depending on PI-485 V-net Control Integration Board for Outdoor Units adapt Multi F / Multi F MAX systems to a LG model). VRF system central protocol for integration with LG central controllers. The PI-485 is installed in the Multi F / Multi F MAX outdoor unit.
  • Page 73 MULTI From Indoor Units to Remote Controllers • Communication cable from indoor unit to remote controller(s) is to be LG supplied or field supplied 22 AWG, 3-conductor, twisted, stranded, unshielded. Wiring must comply with all applicable local and national codes.
  • Page 74 • Selection of operation options (operation/mode/set temperature) • Control of air flow rate (High/Medium/Low) Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 75: Final Installation Procedures

    Also test for leaks at both service valves. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 76 Open the gauge manifold and the vacuum pump valves. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 77 • Use a quality micron gauge in good operating order and install as far away from pump as possible. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 78 13. Shut the valves before turning off and disconnecting the vacuum pump. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 79 - (4 - 3) x 5.29 = 10.82 oz. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 80 – (8 - 5) x 3.53 = 9.61 oz. 9,000 18,000 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 81: Refrigerant Charge

    Check Valve Refrigerant Cylinder Vacuum Gauge (One) OPEN Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 82 ASHRAE Standard 15 / 34 and addenda current as of the date of this publication. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 83 See also the LG HVAC Building Ventilation Guide on www.lghvac.com. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 84: Test Run

    5. Proceed with powering on the remote controller and usage as needed. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 85 Reducing Power Consumption (Step 2) with Mode Lock (Heating) Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 86 • Only the first four DIP switches are used to set settings and functions. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 87 Step 1 Step 2 Step 1 Step 2 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 88 • Only the first four DIP switches are used to set settings and functions. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 89 LMU541HV ODU DIP Switch LMU601HV ODU DIP Switch Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 90 PCB Display The cycle data can be checked without using LG Monitoring View (LGMV) Diagnostic Software by pushing the tact switch for most models. See below for the types of cycle information that will be displayed in LGMV. After first page is displayed, the second page will be subse- quently displayed.
  • Page 91 Indoor unit EEPROM error Indoor unit BLDC motor fan lock Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 92: Error Codes

    Indoor unit fan motor operation error has failed. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 93 Outdoor unit brushless direct current (BLDC) fan motor lock error Outdoor unit PFC overcurrent (peak) error Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 94: Lgmv Diagnostic Software

    • Average indoor unit (IDU) pipe temperature • Inverter compressor operation indicator light Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 95 • Information displayed also depends on which unit is installed. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

  • Page 96: Maintenance Recommendations

    It is also recommended to monitor system operation using LGMV and / or SIMS Software at least once a year. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 97 Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 98 Only LG-supplied Y-cables are used between grouped indoor units, if applicable. Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 99 Major Component Rough-In Piping and Insulation Brazing Practices Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 100 Installation—Branch Distribution Unit (Multi F MAX Systems Only) Installation—Power Wire and Communications Cables Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 101 - ________CF x 5.29 - (________) = ________ Additional Charge (oz.) Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 102 - ________CF x 3.53 - (________) = ________ Additional Charge (oz.) Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
  • Page 103 IM_MultiF_ODU_3HV_1HV_07_2022 Supersedes: IM_MultiF_ODU_1HV_01_22 IM_MultiF_ODU_1HV_11_21 IM_MultiF_ODU_02_21 IM_MultiF_ODU_09_20 IM_MultiF_ODU_06_20 LG Electronics, U.S.A., Inc. IM_MultiF_ODU_04_20 Air Conditioning Technologies IM_MultiF_ODU_03_17 4300 North Point Parkway IM_MultiF_ODU_11_16 Alpharetta, Georgia 30022 IM_MultiF_ODU_4_16 www.lghvac.com IM_MultiF_ODU_11_15...
  • Page 104 • 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 Type http://www.lghvac.com www.lg.com P/NO : MFL68280101...
  • Page 105 FLEX MULTI SPLIT INSTALLATION INSTRUCTIONS...
  • Page 106 Multi Air Conditioner Installation Manual TABLE OF CONTENTS Required Tools Installation Requirements Installation Parts Provided ...........4 Safety Precautions ..............5 Installation of Indoor, Outdoor Unit ........8 Select the best location ............8 o Level gauge Seaside Applications and Installation ......10 o Screw driver Seasonal Wind And Cautions In Winter......11 o Electric drill Piping length and elevation ..........12...

  • Page 107: 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 108: Safety Precautions

    Product Introduction Safety Precautions To prevent the injury of the user or other people and property damage, the following instructions must be followed. n Be sure to read before installing the air conditioner. n Be sure to observe the cautions specified here as they include important items related to safety. n Incorrect operation due to ignoring instruction will cause harm or damage.
  • Page 109 Safety Precautions Do not install the product at a place that there Use caution when unpacking and installing. is concern of falling down. • Otherwise, it may result in personal injury. • 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.
  • Page 110 Safety Precautions CAUTION n Installation Install the drain hose to ensure that drain Install the product so that the noise or hot can be securely done. wind from the outdoor unit may not cause any damage to the neighbors. • Otherwise, it may cause water leakage. •...

  • Page 111: Installation Of Indoor, Outdoor Unit

    Safety Precautions 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. Select a place where there are no obstacles in More than front of the unit.
  • Page 112 Installation of Indoor, Outdoor Unit Outdoor unit 1. If an awning is built over the unit to prevent di- rect sunlight or rain exposure, make sure that more than heat radiation from the condenser is not re- 600 (23 21/32) stricted.

  • Page 113: Seaside Applications And Installation

    Installation of Indoor, Outdoor Unit Seaside Applications and Installation 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 114: 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 115 Installation of Indoor, Outdoor Unit 12 Multi Air Conditioner...
  • Page 116 Installation of Indoor, Outdoor Unit Distributor Piping Type Unit : m(ft) Min length of Max Elevation Max Eleva- Max total length Max length Max length Max Combi- Outdoor Unit Max length each pipe Between each tion of all pipes nation Capacity of each (Main /...

  • Page 117: 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 il- lustration on the right) and pull the tubing and drain hose away from chassis.
  • Page 118 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 119 Installation Connecting the piping to the indoor unit and drain hose to drain pipe. 1. Align the center of the pipes and suffi- Indoor unit tubing Flare nut Pipes ciently tighten the flare nut by hand. 2. Tighten the flare nut with a wrench. Open-end wrench (fixed) Outside diameter Torque...
  • Page 120 Installation Wrap the insulation material around the con- Plastic bands Insulation material necting 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 121: 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 122: Wiring Connection

    Installation Wiring Connection 1. Connect the wires to the terminals on the con- trol 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 123: 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 124: How To Fix

    Installation How to Fix Ceiling Keep the length of the bolt Hanging bolt from the bracket to 40mm(1-9/16 inch) (W3/8 or M10) Flat washer for M10 Air Conditioner body (W3/8 or M10) (accessory) Ceiling board Ceiling board Spring washer (M10) Keep the length of 31~34mm(1.22~1.34inch) between the air conditioner bottom surfac e and the ceiling surface...

  • Page 125: 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 126 Installation 3. Please fix remote controller upper part into <Connecting order> the setup board attached to the surface of the wall, as the picture below, 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 boardʼs upper and lower, right and left part.

  • Page 127: 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 128 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 129: 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 130 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 rever- Pipe clamp routing sal 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 131 Installation Attention 1. Possible drain-head height is up to 700mm(27 9/16 inch). So, it must be in- stalled below 700mm(27 9/16 inch). 1/50~1/100 MAX 700mm 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 132: 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 fol- Copper Slanted Uneven Rough lowing procedure. tube 1) Cut the pipes and the cable. n Use the accessory piping kit or the pipes purchased locally.

  • Page 133: 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 Ø12.7(1/2 inch) Connector Finally, tighten the flare nut with torque wrench...
  • Page 134 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 135 Flaring Work and Connection of Piping Branch [unit:mm] Model Gas Pipe Liquid Pipe Ø19.05 Ø9.52 Ø19.05 Ø9.52 PMBL5620 Ø9.52 Ø19.05 Y branch To Outdoor Unit To BD Unit • Ensure that the branch pipes are attached horizontally or vertically (see the diagram below.) Horizontal Facing upwards...

  • Page 136: 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 only 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 137: 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 138: 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 139: Connect The Cable To The Distributor Unit

    Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit Connect the cable to the Distributor unit. • Connect refrigerant pipes and connection wires to the appropriate ports maked with matching alphabets (A, B and C) on this unit. •...

  • Page 140: 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 loos- ening the screw. Connect the wires to the terminals on the control Power Power Power...
  • Page 141 Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit NOTICE 1. Use connection cable NRTL(UL, ETL, CAS…) listed and stranded copper(4) THHN conductors, sunlight (UV) resistant ROHS compliant PVC jacket 600V direct burial listed, approved for wet conditions. Temperature rated for –20℃(-4℉) to 90℃(194℉). And this cable should be enclosed in conduit.

  • Page 142: 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 143: 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 144: 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 145: 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. Indoor unit Confirm the "Lo" knob of the manifold valve is open. Then, run the vacuum pump. Manifold valve The operation time for evacuation varies with Pressure...

  • Page 146: 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 Max total length of all Additional Refrigerant Outdoor Unit Ca- Max length of each...
  • Page 147 Charging Distributor type Models Additional charge (oz) = (( Total Main piping Length - Main Standard Length ) x 0.55 + (A Room Branch Length – Standard Length ) x 0.22 + (B Room Branch Length – Standard Length ) x 0.22 + (C Room Branch Length –...

  • Page 148: Installation Pi485

    Installation PI485 Installation PI485 Fix the PI485 PCB as shown in Fig. Detailed installation method refer to PI485 Installation Manual. 18k Btu/h, 24k Btu/h 36kBtu/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 149: 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 150: 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 set- ting is enabled only when Power is reset. Dip Switch Function 1 2 3 4 Normal Operation (No Function) Forced Cooling Operation Wiring Error Check...

  • Page 151: Forced Cooling Operation

    Function 18/24(1Ø) kBtu/h 36(1Ø) kBtu/h SW01N DIP-SW 54(1Ø) kBtu/h Forced Cooling Operation Adding the refrigerant in winter. Setting Procedure 1. Set the Dip Switch as follow after shutting the power source down. 2. Reset the power. 3. Check that the Red LED of PCB is on during work. (The indoor unit is operated by force.) 4 Add the specific amount of refrigerant.

  • Page 152: 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 oper- ated by force.) 4.

  • Page 153: Night Quiet Mode

    Function Saving Power Consumption Current level. Phase 1Ø Model 18/24k Step1(A) Step2(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) Consumption (step 2) + Mode Lock (Cooling)

  • Page 154: 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 155: Pcb Display(18/24K Model Only)

    Function PCB Display(18/24k 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 1page is displayed, subsequently 2page is displayed. Tact S/W Display Item...

  • Page 156: Combination Indoor Units

    Combination indoor units Combination indoor units The indoor units connectable to the outdoor unit are shown below Model names Outdoor Unit Capacity (Btu/h class) Category Chassis Capacity, kW(kBtu/h Class) 2.1(7) 2.6 (9) 3.5 (12) 4.2(15) 5.3 (18) 7.03 (24) 10.6 (36) Connectable Combination Wall mounted AMNW07GDBL1...
  • Page 157 54 Multi Air Conditioner...
  • Page 158 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...

This manual is also suitable for:

Multi f lmu243hvMulti f lmu303hvMulti f lmu363hvMulti f max lmu481hvMulti f max lmu541hvMulti f max lmu601hv

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