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LG MULTI F Installation Manual
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LG MULTI F Installation Manual

LG MULTI F Installation Manual

Ceiling cassette indoor unit
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MULTI
MULTI
CEILING CASSETTE
INSTALLATION MANUAL
• LMCN078HV
7 kBtu
• LCN098HV4
9 kBtu
• LCN128HV4
12 kBt
F
F
MAX
INDOOR UNIT
• LCN188HV4
18 kBtu

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Summary of Contents for LG MULTI F

  • Page 1 MULTI MULTI CEILING CASSETTE INDOOR UNIT INSTALLATION MANUAL • LMCN078HV 7 kBtu • LCN188HV4 18 kBtu • LCN098HV4 9 kBtu • LCN128HV4 12 kBt...
  • Page 2 For continual product development, LG Electronics U.S.A., Inc., reserves the right to change specifications without notice. ©LG Electronics U.S.A., Inc. This document, as well as all reports, illustrations, data, information, and other materials are the property of LG Electronics U.S.A., Inc.

  • Page 3: Safety Instructions

    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 There is a risk of equipment damage. unit. There is 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 5 Poor cable connections can cause equipment 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 6 Do not block the inlet or outlet. Unit will 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 7: Table Of Contents

    Error Codes .......................................... 47-48 Installation Checklist ....................................... 49-50 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: Unit Nomenclature

    • All indoor units are compatible with wired controllers 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: Introduction

    Indoor Unit. Cassette Units This manual describes how to install the LG Multi F and Multi F MAX (Multi Zone) Ceiling Cassette Indoor Units (IDU) for Multi F heat pump systems. The table on the next page lists the available models. Refer to LG’s Multi F Indoor Unit Engineering Manual for complete detailed engineering data and selection procedures.
  • Page 10 Image Grille Kit (PT-QCHW0 or PT-UQC) One (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 11: General Data

    551 psi design pressure of R410A. Inadequate piping will fail when pressurized. 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 This unit comes with a dry helium charge. 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: Dimensions

    (Air Outlet Hole) (154) 24-13/32 (620) 1 11 24-13/32 (620) 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 24-13/32 (620) (89) 6-1/16 (154) 1 11 24-13/32 (620) 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: Refrigerant Piping Diagram

    Evaporator Inlet Temperature Thermistor CN-PIPE/IN Evaporator Outlet Temperature Thermistor CN-PIPE/OUT 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: Installation

    If damage is found, repack the unit as it was received in the original container. 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: Indoor Unit Location Selection

    The unit will be damaged, will malfunction, and / or will not operate as designed if installed in any of the conditions listed. 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 / systems. Lighting >59-1/16 inches >78-25/32 inches >118-5/32 inches 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: Preparing The Installation Area

    22-15/32 i n ches Uni t Si z e 18-5/32 inches 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: Hanging The Indoor Unit

    Measure the unit at each corner to verify that it is level. 5. Remove the installation guide (template). 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: Indoor Unit Connections

    Conduit • _ 19 Ceiling cassette 4-way • 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 • Tape Connection • Cable Drain Hose 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 23: Flaring Procedure

    INSTALLATION MULTI MULTI Flaring Procedure Flaring Procedure One of the main causes of refrigerant leaks is a defective connection. For LG HVAC systems, the installer needs to know how perform flared connections successfully. • • Flaring Procedure 1. Cut the pipe to length.
  • Page 24 Always use two (2) wrenches to loosen the flare nuts. 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: Outdoor Unit To Indoor Unit Connections

    15,000 Btu/h: Console; 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 26 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 27 Port D only for 24 or 36 kBtu/h Indoor Units) 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 4. When all piping installation has been completed, perform the triple leak / pressure and evacuation tests (see the Final Installation Procedures Section in the Multi F / Multi F MAX or Multi F / Multi F MAX LGRED Outdoor Unit Installation Manual), verify that the system does not have any leaks, and then fully insulate all joints / connections.
  • Page 29 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: General Installation Guidelines

    Drain Hose Connection Use the clip (accessory) Drain Pan 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: Refrigerant Piping

    Refrigerant Piping System Insulation All refrigerant piping from the outdoor unit to the indoor units / branch distribution units (Multi F MAX only) must be insulated correctly for safety and usage. Refrigerant piping, Y-branch connections, field-provided isolation ball valves (if present), service valves, and elbows must be properly and completely insulated using closed cell pipe insulation (up to the indoor unit piping connections).

  • Page 32: Insulating Refrigerant Piping

    3/8 inch thick EPDM insulation that is plenum-rated with a heat-resistance factor of more than 248°F. 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: Wiring

    • Properly ground the outdoor, indoor, and branch distribution units (Multi F MAX with or without LGRED systems only). Ground wiring is required to prevent accidental electrical shock during current leakage.

  • Page 34: Power Wiring / Communication Cable Connections

    Improperly grounding this cable can cause communications errors. 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 35 Power Supply / Power Wiring Specifications • Multi F and Multi F MAX (with or without LGRED) systems operate at 1Ø, 208-230V, 60Hz, and power is wired to the outdoor unit only. The outdoor unit will supply power to the indoor units and the branch distribution units (Multi F MAX [with or without LGRED] systems only) through the communication / connection (power) cable (indoor units and branch distribution units draw minimum power).
  • Page 36 Electrical interference my cause product 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 37 (1[L1]) and Neutral (2[L2]) Cable at Least Two (2) Inches for Each Indoor Unit Outdoor and Indoor Unit appearances may vary depending on the model. Figure 52: Schematic of a Multi F MAX (with or without LGRED) System When the Wiring is GREATER THAN 130 Feet. At Least Two (2) Inches...
  • Page 38 After all wiring is connected to the indoor and outdoor units, test the accompanying remote controllers for performance. As always, follow all safety warnings and notes when operating the units using the remote controller. Additionally, all of the Multi F / Multi F MAX (with or without LGRED) outdoor units can use the following controllers when accompanied with the PI-485 VNet Accessory: •...
  • Page 39 Wiring must comply with all applicable local and national codes. • If using the LG supplied cable and the length needs to be extended, the LG Extension Kit (sold separately) must be used. A maximum of four (4) kits (up to 165 feet) can be used.
  • Page 40 • 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 41: Indoor Unit Electrical Connections

    Refer to the wiring diagram on the indoor unit. Wiring / Cable Connections 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 Figure 59: Multi F Four-Way Ceiling-Cassette Indoor Unit Wiring Diagram. 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 43 Unit to Indoor Unit” earlier in this section for information. 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: Optional Wall-Mounted Controller And Sensor

    (4) to five (5) feet above the finished floor. • It could be necessary to use a handy box that is sized in metric units, depending on the sensor model. Check with your LG representative to verify which size of handy box is needed for the sensor in question.

  • Page 45: Final Installation Procedures

    Insulation should fit tightly so that cool air does not leak 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 46: Installing Batteries

    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 47: Troubleshooting

    Indoor unit BLDC motor fan lock Indoor unit middle pipe sensor 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 48 Refer to Service Manuals posted on www.lghvac.com for a full description of all error codes and workarounds. 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: Installation Checklist

    Pipe insulation was not compressed at any point. Y-branch fittings were properly INSTALLED per details provided in the Multi F / Multi F MAX (with or without LGRED) Outdoor Unit Installation Manual. Y-branch fittings were properly SUPPORTED per details provided in the Multi F / Multi F MAX (with or without LGRED) Outdoor Unit Installation Manual.
  • Page 50 The power supplied was clean with voltage fluctuations within specifications. (±10% of nameplate). Power wiring to the Multi F / Multi F MAX (with or without LGRED) outdoor unit was field supplied, solid or stranded, and installed per all local, state, and NEC requirements.
  • Page 51 20001747 ISO 9001: 2008 LG ELECTRONICS INC. For further technical materials such as submittals, engineering manuals, service manuals, and catalogs, visit www.lghvac.com. LG Electronics, U.S.A., Inc. Commercial Air Conditioning Division 4300 North Point Parkway IM_Multi_F_CeilingCassette_10_20 Alpharetta, Georgia 30022 Supersedes: IM_Multi_F_CeilingCassette_7_16 www.lghvac.com...

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