LG MULTI F MAX R32 5-Zone Heat Pump | 54,000 BTU Compressor

BROCHURE

A multi-zone HVAC solution designed for demanding buildings in Quebec

At AirGreen , we have been installing multi-zone systems for many years in real-world settings: single-family homes, duplexes, triplexes, multi-unit buildings, and complex commercial spaces in Montreal , Laval , Longueuil , and on the North and South Shores . The LG MULTI F MAX R32 5-Zone Heat Pump – 54,000 BTU fits perfectly into this reality: a centralized solution capable of supplying several independent zones while maintaining high energy efficiency, even in Quebec winter conditions.

This model is aimed at owners and managers who wish to replace several stand-alone systems with a single robust outdoor unit, reduce clutter, improve room-by-room control and optimize overall building energy consumption.

Understanding multi-zone logic: why this system is a game changer

One outdoor unit, up to 8 indoor zones

The heart of the system is the LG KUMXB541A outdoor unit, capable of powering up to 5 active zones (and a maximum of 8 zones depending on the configuration) . Each indoor zone operates independently: temperature, heating or cooling mode, airflow, and programming.

In practice, this allows, for example:

• to heat a frequently used living room,

• to maintain rooms at a more moderate temperature,

• to air-condition a home office without overloading the entire system.

At AirGreen, we have installed this type of configuration in several residences in Laval-des-Rapides and Boucherville , where clients wanted to replace energy-intensive electrical systems without opening up walls to install central conduits.

Intelligent capacity management

With a nominal capacity of 54,000 BTU , the system automatically redistributes capacity according to the actual demand of the indoor units. This prevents excessive on/off cycles, reduces wear on components, and improves overall thermal comfort.

Technical performance adapted to the Quebec climate

Reliable heating in cold weather (data measured under standardized conditions)

The LG MULTI F MAX R32 heat pump is designed to maintain stable operation in winter. The following values ​​correspond to the maximum heating capacities at standard outdoor temperatures:

• 48,000 BTU/h at 17 °F (≈ -8.3 °C)

• 40,500 BTU/h at 5 °F (≈ -15 °C)

• 35,200 BTU/h at -4 °F (≈ -20 °C)

In practice, this type of behavior is particularly relevant on the North Shore (for example in Blainville and Mascouche ) and in some windier areas of the South Shore , where low-temperature heating performance becomes a decisive criterion for multi-story buildings with unequal loads.

Efficiency indicators (COP measurements instead of oversized seasonal values)

For a multi-zone system of this category, the most reliable efficiency benchmarks to compare between models and projects are the COPs measured under test conditions:

• COP in air conditioning (outside 95 °F / ≈ 35 °C): 3.69

• COP in heating mode (outside 47 °F / ≈ 8.3 °C): 3.35

These figures describe actual energy efficiency under standardized conditions. In our projects, the impact on the bill then depends on the sizing, the number of simultaneously active zones, occupancy, instructions, and the quality of the installation.

R-32 refrigerant: a technical and environmental choice

Why R-32 makes a difference

R-32 gas has a lower global warming potential than older refrigerants. In addition to its reduced environmental impact, it offers:

• improved thermal efficiency

• a lower refrigerant charge,

• a faster response to load variations.

In our commercial projects in Montreal East , this choice is often motivated by internal policies to reduce carbon footprint and by compliance with current and future standards.

Installation flexibility: a major advantage in renovation

Generous pipe lengths and elevation changes

This system accepts:

• a total piping length of up to 475.7 ft ,

• a maximum elevation difference of 98.4 ft between the outdoor unit and the indoor units .

In practical terms, this allows us to install the outdoor unit on a roof, backyard or wall mount, while serving homes spread over several floors, without compromising performance.

Compatible with several types of indoor units

The LG MULTI F MAX is compatible with a wide range of LG wall units:
KNUAK091A, KNUAK121A, NUAK181A, KNMAB071A, KNUAB091A, KNUAB121A, KNMAB151A, KNUAB181A, KNMAB241A .

At AirGreen, we often combine different capacities (9,000, 12,000, 18,000 BTU) in the same project in order to precisely adapt each zone to its actual thermal load.

Noise level and acoustic comfort

Discretion both indoors and outdoors

• Indoor units : from 29 dB(A) depending on the model chosen

• Outdoor unit : 55 dB(A)

In a project completed in Outremont , the client was concerned about noise due to rooms located near the outdoor unit. Careful site planning and the use of vibration-damping mounts resulted in virtually imperceptible operation, even during intensive heating.

Electricity, safety and compliance

Key electrical data

• Voltage: 208–230 V (single phase)

• MCA: 33.3 A

• MOP: 40 A

These parameters are essential to ensure a compliant and safe installation. At AirGreen, we systematically coordinate with master electricians to avoid any overload or non-compliance with the Quebec Electrical Code.

LogisVert subsidy: a concrete financial advantage

At the time of writing, this system is eligible for a $1,860 LogisVert provincial grant . For many of our clients in Longueuil and on the South Shore , this financial assistance tipped the scales towards a more efficient multi-zone system rather than a minimalist solution.

What we learned on the ground

Common mistakes to avoid

• Undersizing certain areas for the sake of initial cost savings

• Neglecting pipe routing planning

• Choosing a multi-zone system without considering the actual habits of the occupants

We have seen projects where poor power distribution led to persistent discomfort. At AirGreen, every installation begins with a detailed analysis of the loads and actual usage.

Observed results

• More stable thermal comfort

• Decrease in complaints related to temperature variations

• Better control of electricity bills over 12 months

Why entrust the installation to AirGreen

• Certified and experienced refrigeration technicians

• $5M liability insurance

• Transparent pricing, no surprises

• Recognized expertise in complex multi-zone systems

We don't just install a device: we design a sustainable HVAC solution, tailored to your building and your long-term goals.

Conclusion

The LG MULTI F MAX R32 5-Zone Heat Pump – 54,000 BTU represents a high-performance HVAC solution for residential and commercial buildings that demand flexibility, energy efficiency, and reliability in cold climates. Properly designed and installed, it transforms thermal comfort management while reducing operating costs.

Contact AirGreen today for a personalized assessment, a detailed quote, or to discuss your project in Montreal , Laval , Longueuil , on the North Shore or South Shore . Our team will support you every step of the way, from analysis to installation.