Mid-Static Ducted Indoor Unit. Mid-Static Ducted Units This manual describes how to install the LG Multi F and Multi F MAX (Multi Zone) Convert- ible Mid-Static Indoor Units (IDU) for Multi F heat pump systems. The table below lists the available models. Refer to LG’s Multi F Indoor Unit Engineering Manual for complete detailed engineering data and selection procedures.
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. • During installation, it is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust.
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Unit Connection Socket For connections to regular Multi F and Multi F MAX outdoor unit systems, see the Multi F / Multi F MAX Installation Manual. Due to our policy of continuous product innovation, some specifications may change without notification.
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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.
Condensate can be drained either directly outside or to a common drain system. For more information regarding the common drain system, see below or the Multi F / Multi F MAX with LGRED Outdoor Unit Engineering Manual or the regular Multi F / Multi F MAX Outdoor Unit Engineering Manual.
• Properly ground the outdoor, indoor, and branch distribution units (Multi F MAX Standard or LGRED systems only). Ground wiring is re- quired to prevent accidental electrical shock during current leakage.
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Do not include splices or wire nuts in the communication cable. • Multi F and Multi F MAX (Standard or 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 [Standard or LGRED] systems only) through the communication / connection (power) cable (indoor units and branch distribution units draw minimum power).
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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.
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• If using the back, route the communications cable through the handy box or wall, and through the large hole in the installation plate. • If the distance between the controller and the indoor unit is more than 32 feet (9.75 m), use an LG Extension Cable (sold separately).
Installer Setting Mode sets system functions. Only trained and licensed HVAC technicians should access / use the Installer Setting Mode. If any installation procedure or system change is performed by someone other than a trained and licensed HVAC technician, LG is not respon- sible for the results, and it will void the warranty.
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• A sub-setting that isn’t recognized by the indoor unit will revert to the default setting. • The controller will display all sub-settings if the function is available for the indoor unit. Contact an LG Representative for details. FC-35 (Thermo Off - Indoor Unit Fan Table 24: Wired Controller Settings FC-35 Set Codes and Displays.
These codes are the most common that will manifest through these units. The system installed might generate additional codes not listed here. Contact an LG trained service provider if these types of errors are seen, and a simple power down and boot up has not corrected the issue.
Pipe insulation was not compressed at any point. Y-branch fittings were properly INSTALLED per details provided in the Multi F / Multi F MAX (Standard or LGRED) Outdoor Unit Installation Manual. Y-branch fittings were properly SUPPORTED per details provided in the Multi F / Multi F MAX (Standard or LGRED) Outdoor Unit Installation Manual.
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The power supplied was clean with voltage fluctuations within specifications. (±10% of nameplate). Power wiring to the Multi F / Multi F MAX (Standard or LGRED) outdoor unit was field supplied, solid or stranded, and installed per all local, state, and NEC requirements.
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For further technical materials such as submittals, engineering manuals, service manuals, and catalogs, visit www.lghvac.com. LG Electronics, U.S.A., Inc. Air Conditioning Technologies 4300 North Point Parkway Alpharetta, Georgia 30022 New Issue: IM_Multi_F_Mid-Static_Ducted_11_23 www.lghvac.com...
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