Year-round comfort with LGRED° Heat Technology for low temperature heating down to -13°F is standard on LG's NEW Multi-F Systems!
With the new LG Flex Multi-Split Six-Zone system, you can provide the right temperature and customize the look in up to six rooms. The new LMU421HHV offers year round comfort control with its 42,000 BTU configurable 6-zone mini split air conditioning and heating system. LG's Flex Multi-Split Six-Zone air conditioner system gives you the opportunity to install as few as two or up to six independently operated, indoor units virtually anywhere in your home. This system is Energy Star Qualified when used with non-ducted or ducted units only. It is not Energy Star when used with mixed ducted and non-ducted units.
Featuring LGRED° Heat Technology, this system can be used as a primary heat source in most of the country. With enhanced cooling and heating ranges, LGRED° Heat Technology allows your multi-zone system to offer 100% heating capacity with temperatures as low as 5°F and will continue to heat even when temperatures get down as low as -13°F! And, if you need the air conditioner, you can run the AC when it is as cold as 14°F outside. This is a great solution for rooms that need to stay cool. Add a Low Ambient Kit (sold separately) for cooling operation down to -4°F. The new LGRED° Heat Technology Systems also include a factory installed Base Pan Heater to ensure better heat performance in colder weather.
This system combines individual room temperature control with low operating costs. The LMU421HHV can be easily installed without major renovations. Each unit requires a line set to connect it to the outside unit. The line sets (sold separately), are run through the interior wall, requiring about a 3” hole, to the outdoor unit.
The LMU421HHV outdoor unit offers standard features including a super energy efficient variable speed inverter compressor, defrost/deicing capabilities, three minute restart delay, and a self diagnosis system. It also includes soft start which reduces power surges on the electrical system. It operates when the outside temperature is as low as 14°F in the cooling mode (down to -4°F with a low ambient kit installed) and from -13°F to 64°F in the heating mode. To top it all off, it uses environmentally friendly R-410A refrigerant and is pre-charged for up to 147.6’ of line.
This system does require some additional installation items as pictured in the illustration above. In addition to the outdoor unit (LMU421HHV), a Y connector/branch, and up to two Branch Distribution Boxes and the indoor units. The Y Branch splits the initial line, each line connects to a Branch Distribution Box and then each indoor unit is connected via its own line to a Branch Box. Line sets and communication wire (sold separately) connect to each indoor unit. Each unit installed can be easily matched to your room requirements both in terms of decor and BTUs. Each indoor unit has its own temperature control, allowing each room to be individually controlled at different temperatures.
Four branch distribution boxes are available to customize your installation. Each branch distribution unit is specific to the number of indoor units you will be using. There is a 2 unit (PMBD3620), offering two 24,000 BTU ports for a maximum of 48,000 BTU capacity. The 3 unit (PMBD3630), offers three 24,000 BTU ports for a maximum of 72,000 BTU capacity. And there are two options of 4 port units. The PMBD3640 offers four 24,000 BTU ports for a maximum of 73,000 BTU capacity and the PMBD3641 offers four ports including three standard ports and one 36,000 BTU port for a maximum of 73,000 BTU capacity. Depending on how many indoor units you will be installing, the correct size distribution unit needs to be installed. However, you do not need to use all the ports available at the time of your initial installation. If you think you will be adding additional indoor units in the future, you can "cap off" the unused ports on the branch distribution units until that later time.
Because of the complexity and flexibility of configuring the LG LMU421HHV and all the required components, we ask that you contact us for expert advice and purchasing.
LG offers ultimate flexibility and configurability in your selection of indoor unit. All indoor units offer a variety of fan speed options and auto restart operation. Contact us for expert advice in configuring your system.
Indoor Unit Options
Standard Wall Unit (LMN079HVT, LSN090HSV5, LSN120HSV5, LMN159HVT, LSN180HSV5, LMN249HVT) - The standard wall unit comes in a white finish and will blend quietly and seamlessly into any room decor. It is installed high on a wall. It connects to the outdoor compressor through a small opening in your wall, drilled behind the unit. The line set and wire (required, sold separately) are sent through the opening and connect to the compressor outside. A wireless remote is included for convenient operation from anywhere in the room. Available in 7,000, 9,000, 12,000, 15,000, 18,000, and 24,000 BTUs.
Art Cool Wall Unit (LAN090HSV5, LAN120HSV5, LAN180HSV5) - The Art Cool wall unit comes in a reflective, smoky black, mirrored finish that will add a modern flare to any decor, while still blending quietly into any room. Like the standard wall unit, it is installed high on a wall and connects to the outdoor compressor through a small opening drilled in your wall, behind the unit. The line set and wire (required, sold separately) connect to the compressor outside through this opening. A wireless remote is included for convenient operation anywhere in the room. Available in 9,000, 12,000, and 18,000 BTUs.
Art Cool Gallery (LMAN097HVP, LMAN127HVP) - An Art Cool Gallery unit can be a beautiful, non-obtrusive way to get conditioned air into any room of your choice. A 2’ x 2’ frame allows you to display a personal piece of artwork (or the included piece). The air is dispersed quietly and efficiently from the edges and bottom of the frame into your room. It is installed on a wall and connects to the outdoor compressor through a small opening drilled in your wall, behind the unit. The line set and wire (required, sold separately) connect to the compressor outside through this opening. A wireless remote is included for easy control. Available in 9,000 or 12,000 BTUs.
Ceiling Concealed Ducted Low Static Unit (LDN097HV4, LDN127HV4, LDN187HV4)- Low Static Concealed Ceiling units are installed in a ceiling and hidden from view. They require ducting as well as registers. The registers allow the conditioned air to come down into the space. Depending on the size and shape of your space, a concealed unit can be ducted for multiple rooms or one single room. As an example, an 18000 BTU unit will provide comfort control up to about 825 sq. ft. A drain pump is included with this unit. A controller is required to operate each indoor unit. One is not included with the unit. Available controllers include a wired simple controller PREMTC00U, or a wired, touchscreen controller PREMTA000 (each sold separately). Wire required to connect the Indoor unit to the wired controller is not included (PZCWRC1 - sold separately). Available in 9,000, 12,000, and 18,000 BTUs.
Ceiling Concealed Ducted High Static Unit (LHN248HV, LHN368HV) - High Static Concealed Ceiling units are installed in a ceiling and hidden from view. They require ducting as well as registers to allow the conditioned air to come into the space. Depending on the space you are trying to condition, a high static unit allows for longer duct runs from the unit itself. This way, you can install the unit and duct off into several individual areas, wherever the air is needed. This may be one large space or multiple rooms. The 24,000 BTU unit will provide comfort control up to about 1100 sq. ft. A drain pump is included with this unit. A controller is required to operate each indoor unit as well as a wireless remote control. One is not included with the unit. Available controllers include a wired simple controller PREMTC00U, or a wired, touchscreen controller PREMTA000 (each sold separately). Wire required to connect the Indoor unit to the wired controller is not included (PZCWRC1 - sold separately).
Ceiling Cassette Unit (LMCN078HV, LCN098HV4, LCN128HV4, and LCN188HV4) - A ceiling cassette installs into the ceiling and offers 4-way airflow into your space. A grille is required on a ceiling unit (standard white grille included) and air is dispersed from all 4 sides of the grille. A ceiling cassette can be installed in the center of a room, allowing airflow all around. Alternatively, it can be installed along the edge of a room, closing off 1 or more "vents" for customized air flow. A drain pump is included with this unit as well as a wireless remote control. Available in 7,000, 9,000, 12,000 and 18,000 BTUs.
Vertical Air Handler Unit (VAHU) (LVN181HV4, LVN241HV4 and LVN361HV4) - Vertical Air Handlers are 4-way, multi-position air handlers. A multi-position air handler can be installed as an upflow, downflow, horizontal left or horizontal right installation. This allows for attic or basement installations. A vertical air handler may be used as a way of replacing a conventional air handler currently being used as part of a central system. Another possibility may be that you are looking to zone your dwelling with a mini split system regardless of whether you are using existing ductwork or adding new. The 18,000 BTU multi-position unit will add comfort control to a space that is about 800 sq. ft. The 24,000 BTU unit can be ducted units into several rooms totaling about 1100 sq ft. With 36,000 BTUs, you can control about 1600 sq. ft. of space. All units will heat and cool your space both appropriately and efficiently. Regardless of the number of spaces you are cooling/heating, a wall mounted thermostat will control that zone. A controller is required to operate each indoor unit. One is not included with the unit. Available controllers include a wired simple controller PREMTC00U, or a wired, touchscreen controller PREMTA000 (each sold separately). Wire required to connect the Indoor unit to the wired controller is not included (PZCWRC1 - sold separately).
Low Wall Console (LQN090HV4, LQN120HV4, and LMQN150HV) - A low wall console unit unit can be installed as a flush or recessed mounted wall/floor standing unit. The air is dispersed quietly and efficiently from the bottom of the unit and into your room. It is installed low on a wall and connects to the outdoor compressor through a small opening drilled in your wall, behind the unit. The line set and wire (required, sold separately) connect to the compressor outside through this opening. A wireless remote is included for easy control. Available in 9,000, 12,000 and 15,000 BTUs.
Mini Split Line Sets - Line sets are a requirement when installing a mini split system. They are the connection between the outdoor unit and the indoor units of your system. On a system such as the LMU421HHV, every indoor unit is connected to the outdoor unit through a branch distribution box. The branch distribution box is then connected to the outdoor unit through a "y" connector, as shown in the sample installation. Each indoor unit uses its own line set. Distribution boxes require line sets as well. Most Mini Split Line Sets come with flared connectors attached and are ready to install. Our line sets are offered with and without control wire and are available in various connection sizes and lengths to meet your installation needs. The line set shown in the photo does not include the control wire.
Why Total Home Supply?
We are an LG Authorized Online Distributor. We are also the only online seller to have an LG Technical Service Advisor on staff. Whether you have pre-sales questions or you need support after your order, we are here for you. We are an LG Authorized Parts Distributor meaning any warranty parts requests are processed quickly and easily.
- Number of Zones:
- 2 - 6
- Maximum Number of Indoor Units:
- EER (Non-Ducted / Ducted / Mixed Units):
- 13.8 / 13.1 / 13.5
- SEER (Non-Ducted / Ducted / Mixed Units):
- 21.5 / 19.0 / 20.3
- Energy Star:
- Cooling Amps:
- Cooling BTUs:
- Includes Heat Pump:
- Heat Pump BTUs:
- Heat Pump Heating Amps:
- HSPF (Non-Ducted / Ducted / Mixed Units):
- 11.5 / 10.5 / 11.0
- Outdoor Unit Noise Level (dBA):
- Circuit Breaker Size (Amps):
- Operating Range - Cooling:
- 14° F ~ 118° F
- Operating Range - Heating:
- -13° F ~ 64° F
- Min. Outdoor Temp for Heat °F:
- Inverter Technology:
- Pipe Length (No Addl Refr Req):
- 49.2 ft. Main Piping + 131.2 ft. Branch Piping
- Max. Pipe Length/Zone (ft.):
- 229.6' / 475.7' Total
- Outdoor Unit Width (in.):
- Outdoor Unit Depth (in.):
- Outdoor Unit Height (in.):
- Outdoor Unit Weight (lbs.):
- AHRI Certified
- Parts Warranty:
- 10 Years
- Compressor Warranty:
- 10 Years
- Labor Warranty:
- Max. Connected Outdoor BTU Capacity:
Product WarrantyLIMITED WARRANTY:
1. STANDARD FIVE (5) YEAR WARRANTY FOR A QUALIFIED SYSTEM - The Part(s) of a qualified System, including the compressor, are warranted for a period (the “Standard Parts Warranty Period”) ending five (5) years after the date of original installation. In absence of proof of installation the warranty date will end five (5) years from the date of manufacture.
2. ADDITIONAL TWO (2) YEAR COMPRESSOR PART WARRANTY - The Compressor is warranted for an additional two (2) year period after the end of the applicable Standard Part Warranty Period (the Compressor Warranty Period”).
The Standard Warranty Period and the Compressor Warranty Period are extended to a total of ten (10) years (the “Extended Warranty Period”) for qualified Systems that have been (a) installed by a party that has completed the Training Requirements, (b) installation is pursuant to LG’s published instructions, and (c) product is registered within 60 days of startup at www.lg-dfs.com or www.lg-dfs-warranty.com.
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