LG MULTI F MAX R32 6-Zone Heat Pump | 54,000 BTU Compressor

A multi-zone solution designed for complex buildings in Greater Montreal

At AirGreen , we have been installing multi-zone HVAC systems for many years in real-world settings: Montreal duplexes , multigenerational homes , upscale condos , professional offices , and multi-unit residential buildings in Montreal , Laval , Longueuil , and on the North and South Shores . The LG MULTI F MAX R32 6-zone heat pump with a 54,000 BTU compressor is one of the solutions we recommend when heating and cooling needs far exceed those of a standard residential system.

This model stands out for its real ability to manage several independent zones , while maintaining thermal stability , high energy efficiency and installation flexibility essential in the Quebec real estate stock, often constrained by space, floor configuration or piping distances.

Why this system is relevant in the Quebec context

Power suited to demanding configurations

With a nominal cooling capacity of approximately 54,000 BTU , this multi-zone heat pump is designed to power up to 6 active zones (with compatibility for up to 8 indoor units depending on the configuration). In practice, we see it performing well in:

• triplexes with independent wall units,

• multi-story houses with distinct zones on each level,

• commercial offices requiring precise control by space

• rental accommodations where comfort must be constant, even in difficult winter conditions.

What "54,000 BTU" actually means (and what many people confuse)

An essential point: on multi-zone systems, the "nominal" capacity is a reference , but the actual performance also depends on the combination of indoor units , the combination ratio , the pipe lengths , the elevation difference , and whether several zones require (or do not require) full power at the same time.

This is precisely why at AirGreen , we never size things "by eye". We validate the distribution logic, because that's where comfort and energy consumption are gained (or lost).

Choosing R-32 refrigerant: a tangible advantage in the field

R-32 gas is not just a marketing ploy. In practice, we observe:

• good efficiency at partial load

• a reduction in environmental impact compared to R-410A,

• improved compatibility with future standards ,

• simpler maintenance in the long term.

In a context where regulations are changing rapidly in Quebec, this choice protects the client's investment.

Performance: realistic, comparable and useful values

For this type of multi-zone outdoor unit, the most reliable indicators to compare (and the most consistent from one technical document to another) are:

• the capacity range (min / nominal / max),

• the COP (efficiency under standardized conditions),

• the maximum heating capacities at different temperatures,

• and electrical parameters (MCA/MOP, currents, starting).

Here are the concrete benchmarks of this model:

• Cooling capacity (min–nominal–max) : 10,800 – 50,500 – 63,200 BTU/h

• Heating capacity (min–nominal–max) : 12,420 – 58,000 – 64,000 BTU/h

• Maximum heating capacity at 17°F (-8°C) : 48,000 BTU/h

• Maximum heating capacity at 5°F (-15°C) : 40,500 BTU/h

• Maximum heating capacity at -4°F (-20°C) : 35,200 BTU/h

• COP air conditioning (at 95°F) : 3.69

• Heating COP (at 47°F) : 3.35

In our projects in Montreal , Laval and Longueuil , these values ​​translate above all into a simple reality: the system is capable of ensuring stable comfort in multi-space buildings, as long as the design (zones, units, piping, control) is done correctly.

Essential installation flexibility in existing buildings

Advanced Pipe Management

In Montreal apartment buildings, the distance between the outdoor unit and the indoor units is often a challenge. This system allows:

• a total piping length of up to 475.7 ft ,

• a difference in level (outdoor unit vs indoor units) of up to 98.4 ft ,

• an architecture with distribution units (BD Units) , essential for operation on this type of multi-zone.

In practice, this allows us to install the system on flat roofs , narrow backyards , or even technical balconies , without compromising performance, as long as segment and branch limitations are respected.

What we explain to clients: the piping is not a detail

In a multi-zone system, the piping and controls represent part of the "invisible engine" of comfort. A system can be excellent on paper and become disappointing if:

• The branches are too long or poorly balanced.

• The drainage slopes are not controlled.

• The insulation of the lines is insufficient.

• The wall penetrations are not airtight (air infiltration).

• the distribution is poorly chosen in relation to the number and type of internal units.

This is one of the reasons why a successful multi-zone installation requires a more rigorous approach than a simple 1:1 wall-mounted system.

Wide compatibility of indoor units

This system accepts several LG wall-mounted, console, and ducted units (depending on the selection), allowing us to adapt each zone according to:

• the actual area,

• ceiling height,

• the use of the premises,

• aesthetic constraints.

This allows us to avoid uniform installations that are poorly adapted to the reality of the occupants.

Concrete examples of AirGreen installations

Real case study: Duplex in Longueuil

In a renovated duplex on the South Shore , the owner wanted:

• 3 zones on the ground floor,

• 3 zones upstairs,

• a single, discreet outdoor unit.

We installed an LG MULTI F MAX 6-zone system , with balanced distribution and independent WiFi control for each unit. The result: stable comfort, simple zone management, and a significantly more pleasant user experience than a single system that overheats some rooms and underheats others.

Real-life case: Professional offices in Laval

In an open-plan retail space with enclosed offices, the modularity of the multi-zone system eliminated the need for multiple outdoor units. The on-site team particularly appreciated the ability to adjust each zone according to actual occupancy, which reduced internal complaints and stabilized operating costs.

Technical points that we systematically validate

At AirGreen , we never sell a multi-zone system without:

• calculation of actual thermal load per zone

• Electrical validation: MOP 40 A and MCA 33.3 A ,

• verification of the existing electrical panel,

• precise planning of the routing of refrigerated lines,

• long-term maintenance strategy.

This is precisely where many competing installations fail: the product is good, but the system design doesn't keep up.

Reliability, noise and comfort

• Outdoor noise level (cooling mode / heating mode) : approximately 53 / 55 dB(A) , relevant for dense residential areas.

• Variable speed compressor with soft start, helping to limit sudden variations and improve stability.

• Interesting operating range for our climate: the air conditioning can operate up to very high temperatures (and the heating remains usable in winter conditions, depending on the configuration and demand).

In the cramped neighborhoods of Montreal (alleys, shared courtyards, balconies), these details really matter.

Guarantee and peace of mind

• Warranty (compressor / parts / labor) : 10-10-6 years

• Additional warranty available depending on the plan chosen

• AirGreen support for selection, installation, and monitoring

We support our customers well beyond installation, particularly for HVAC maintenance and service calls .

Why entrust this project to AirGreen?

Choosing AirGreen means:

• work with certified and experienced refrigeration technicians ,

• benefit from transparent pricing , with no surprises.

• benefit from $5 million liability insurance ,

• to obtain a solution truly tailored to your building,

• to have a local contact in Montreal , Laval and Boucherville .

We only install this type of system when it is technically justified and economically sound for the client.

Next Step

Are you considering a multi-zone heat pump for a residential, commercial or multi-unit project in Montreal , Laval , Longueuil , on the North Shore or the South Shore ?
Contact AirGreen now for a complete analysis , a detailed quote and a professional HVAC installation.

Warranty: 10 years on the compressor, 10 years on parts and 6 years on labor, straight from the distributor.