LG Multi F MAX LGRED R32 Heat Pump | 5 Heads at 48,000 BTU | Montérégie

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

In high-end residential projects, multi-unit buildings and commercial spaces in Montreal , Laval , Longueuil , the North Shore , the South Shore and the Montérégie region , the demand is clear: a multi-zone heat pump capable of offering independent room management, stable performance in winter heating and long-term mechanical reliability.
The LG Multi F MAX LGRED R32 – 48,000 BTU heat pump with 5 heads precisely meets these expectations, provided it is correctly selected, configured and installed , which is at the heart of AirGreen 's expertise.

This system is not a classic wall-mounted heat pump: it is a centralized multi-zone HVAC platform, designed to serve up to 8 indoor units , with a nominal capacity of 48,000 BTU in air conditioning and heating performance maintained down to -25°C , a fundamental criterion for the Quebec climate.

Technical architecture of the LG Multi F MAX LGRED R32 system

An outdoor unit designed for stability and longevity

The KUMXA481A outdoor unit is equipped with a variable-speed scroll compressor , using R-32 refrigerant, known for:

• energy efficiency superior to several previous generations

• a reduced refrigerant charge ,

• a reduced environmental impact .

Unlike simplified residential multi-zone systems, the Multi F MAX is based on a professional distribution logic , with the option to integrate branch distribution units (BDUs) . This architecture allows for:

• pressure stability in the refrigeration network,

• better capacity distribution when multiple zones are operating simultaneously

• a reduction in perceived temperature variations.

At AirGreen , we favour this type of system when the building configuration justifies a more advanced HVAC approach than standard multi-zone systems.

Actual capabilities and measured performance

Accuracy is key: some online marketing materials sometimes display unrealistic values. Here are the consistent and verified technical specifications for this model:

• Rated cooling capacity : 48,000 BTU

• Maximum heating capacity :

  • up to 56,500 BTU at +8 °C ,

  • approximately 45,200 BTU at -15°C ,

  • guaranteed operation down to -25 °C .

• COP in heating (standard conditions) : approximately 3.6 to 3.8 , depending on the outside temperature.

• External noise level : ~ 56 dB(A) , remarkable for a unit of this capacity.

These performance levels explain why this system is eligible for ENERGY STAR® Cold Climate programs and the LogisVert grant from Quebec, currently valued at $4,200 , subject to overall project compliance.

Flexibility of indoor units: a real multi-zone advantage

Wide selection of indoor heads

The LG Multi F MAX allows you to combine different types and capacities of indoor units, including:

• 9000 BTU (KNUAB091A),

• 12,000 BTU (KNUAB121A),

• 14,300 BTU (KNMAB151A),

• 18,000 BTU (KNUAB181A).

This flexibility is essential in real-world projects: a condo, a duplex, or a commercial space never has uniform thermal requirements.
At AirGreen , we systematically perform a room-by-room analysis , taking into account:

• orientation,

• glazed surfaces,

• insulation,

• actual uses of the premises.

This avoids common mistakes: unnecessary oversizing, acoustic discomfort or cycles that are too short.

Air distribution and actual comfort

The LG wall units associated with this system offer:

• an automatic vertical and horizontal scan ,

• modulated ventilation ,

• interior noise levels as low as 27 to 29 dB(A) depending on the model and speed.

In several installations carried out by AirGreen in Boucherville and on the South Shore , this point was decisive for clients sensitive to noise, particularly in bedrooms or teleworking spaces.

HVAC Installation: Where Everything Really Happens

Refrigeration network and technical constraints

The Multi F MAX imposes strict rules:

• Total piping length may exceed 450 ft .

• Height differences between indoor and outdoor units can reach nearly 100 ft .

• Precise sizing of liquid (3/8") and gas (3/4") pipes.

A sloppy installation inevitably leads to:

• yield losses,

• defrosting defects,

• premature wear of the compressor.

This is precisely why AirGreen entrusts these projects only to certified refrigeration technicians , who are used to VRF / Multi F systems, and not to basic multi-zone installations.

AirGreen Experience Report – Montérégie

During a recent project in a multi-unit residential building in the Montérégie region , the client was hesitating between several multi-zone systems.
After analysis, the LG Multi F MAX was selected for:

• stability in winter heating ,

• the possibility of 5 independent zones with a single outdoor unit,

• compatibility with municipal acoustic requirements.

Result after a full winter:

• measured reduction in electricity consumption

• consistent temperatures despite variations in exposure,

• No complaints related to noise or defrosting.

Maintenance, reliability and long-term outlook

Recommended maintenance

A system of this scale requires:

• Regular cleaning of the internal filters,

• annual inspection of the refrigeration system,

• checking operating parameters and defrosting.

AirGreen offers tailored HVAC maintenance programs specifically designed for complex multi-zone systems.

Guarantee and peace of mind

• Compressor : 10 years

• Parts : 10 years

• Labor costs : variable, with the possibility of an AirGreen extended warranty

In large-scale projects, we systematically recommend an extended warranty , particularly in buildings with heavy use.

Why choose AirGreen for this type of heat pump?

Choosing the LG Multi F MAX LGRED R32 heat pump is a technical decision.
Choosing AirGreen means ensuring:

• from an honest and realistic selection of the system,

• of an HVAC installation compliant with LG and Quebec standards ,

• comprehensive support , from design to maintenance,

• with recognized expertise in Montreal, Laval, Longueuil, on the North Shore, the South Shore and in Montérégie .

Conclusion

The LG Multi F MAX LGRED R32 – 48,000 BTU, 5-head heat pump is a robust, scalable HVAC solution perfectly suited to complex projects in Quebec, provided it is properly designed and installed .

For a detailed quote , a personalized technical analysis or to validate eligibility for the LogisVert grant , contact AirGreen directly.
Our team will support you with the rigor and transparency that have built our reputation.