Installation of a 3-head GREE Free Match R32 heat pump in Massueville with wall-mounted units for comfort throughout three zones

In Massueville, the success of a three-head system depends as much on the indoor positioning as on the choice of outdoor unit

On this GREE Free Match R32 3-head heat pump installation in Massueville, the photograph shows an element that is often less spectacular than a large outdoor unit, but just as important for everyday comfort: one of the indoor wall-mounted units.

It is installed very close to the ceiling, on an unobstructed section of wall, with enough space beneath the unit to allow its louver to distribute air throughout the room. This position is far from arbitrary. In a multi-zone system, each head must be installed so that it can effectively condition its own room without creating an unpleasant draft, being blocked by furniture, or complicating maintenance.

The project of Massueville illustrates this logic precisely. With a GREE Free Match R32 three-head heat pump, we are not simply trying to connect three indoor units to one outdoor unit. We must make these three zones work as a coherent whole while giving each one air distribution suited to its volume and use.

A ceiling-mounted indoor unit: why this choice makes sense

Warm air naturally rises. In cooling mode, cool air projected from a high position can gradually descend and mix with the room air. In heating mode, the distribution strategy is different: the louver can direct the air more downward to limit heat buildup near the ceiling.

The unit visible in the photo is installed on a relatively unobstructed section of the wall, which facilitates this airflow.

We avoid placing a head whenever possible:

• directly above a bed;
• facing a sofa located a short distance away;
• behind a door;
• above a tall cabinet;
• in a corner that is too tight;
• against a ceiling that would prevent access to the filter;
• in an area where installing the condensate drain would be difficult.

In a three-head installation, repeating the same height three times without considering the rooms would be a mistake. A bedroom, living room, and office may require different positions depending on the building’s layout.

The clearance around the head directly affects its efficiency

A wall-mounted unit generally draws air in through the top before passing it through its heat exchanger. If it is pressed against the ceiling or enclosed between two walls, airflow intake may be restricted.

In this installation, the head is positioned high enough to promote good air distribution while maintaining useful clearance around its upper section.

We must also anticipate what will happen after we leave. A homeowner might eventually add:

• curtains;
• a shelf;
• a wardrobe;
• a television;
• a light fixture;
• a tall cabinet.

These additions must not block the intake or airflow.

This consideration is particularly important for a multizone heat pump, because if one indoor unit operates poorly, it may give the impression that the entire system is incorrectly sized, when the problem is simply air distribution.

Three zones do not mean three identical installations

The principle of the GREE Free Match R32 is to allow multiple indoor units to share a single outdoor unit.

The technical specifications indicate that different outdoor units can accommodate two to five indoor units, depending on their capacity. For a three-unit configuration, the 24,000, 28,400, 36,000, and 42,000 BTU/h cooling models may be relevant, depending on the selected combination.

This offers considerable flexibility, but that flexibility should not be confused with automatic sizing.

We must analyze each room separately.

Zone 1: the main room

An open-plan area with several windows may require greater capacity, especially if it is exposed to sunlight for several hours.

Zone 2: a bedroom

A bedroom often has a lower load. An oversized indoor unit may quickly reach its setpoint without running long enough to provide optimal dehumidification in summer.

Zone 3: office, second bedroom, or another enclosed space

This third zone may have a completely different profile. An office with two computers, for example, does not generate the same internal load as a bedroom used only at night.

The final choice must therefore be based on the actual building, not on a formula such as “three rooms = three identical indoor units.”

The multizone operation you need to understand before installation

The three indoor units can have different temperature settings. However, they share a single outdoor unit.

In a typical configuration of this type, the indoor units must operate in the same general mode. In practice, it is possible to set one bedroom to 20°C and the living room to 22°C in heating mode, but it is normally not possible to operate one zone in cooling mode and another in heating mode simultaneously.

We always explain this principle because it can be a source of confusion in homes where some rooms are very sunny while others remain cool.

Proper placement of the indoor units reduces this risk of conflict by improving comfort consistency.

G10 inverter technology adjusts capacity to actual needs

The documentation for the GREE Free Match R32 mentions inverter technology G10, intelligent defrosting, self-diagnostics, automatic voltage adaptation, and up to seven compatible indoor-unit options. It also indicates that an A2L leak-detection sensor is included.

The advantage of an inverter compressor is particularly relevant for a three-head system.

If only one zone requires a lot of heating, the outdoor unit can adjust its output. When all three rooms approach their target temperature, it can reduce its speed instead of continuously cycling on and off.

This modulation can provide:

• more consistent temperature;
• fewer sudden variations;
• quieter operation at partial load;
• better humidity management in summer;
• consumption better suited to demand.

Up to 21 SEER2 and 10 HSPF2

The Free Match R32 range delivers efficiency of up to 21 SEER2, 12.5 EER2 and 10 HSPF2. The stated operating range in cooling mode extends from -30 °C to 48 °C.

In heating mode, the documentation indicates an outdoor range extending down to -30 °C.

For a property of Massueville, these specifications are particularly relevant because a heat pump installed in Quebec must be evaluated for both its winter performance and its cooling efficiency.

However, it remains important to distinguish the minimum operating temperature from the capacity actually available at that temperature. A machine capable of operating at -30 °C does not necessarily provide its full rated capacity at -30 °C.

We therefore size the system according to the property's heat losses and the exact combination of units.

Why the outdoor capacity should never be guessed from an indoor unit

The photo shows the indoor unit, but the label is not clear enough to confirm its exact capacity. We therefore do not arbitrarily assign it a capacity of 9,000, 12,000, or 18,000 BTU/h.

Likewise, without the complete outdoor unit nameplate, we cannot state that this project uses a 24,000, 30,000, or 36,000 BTU/h unit.

The GREE specifications provide several possibilities:

• GWHD(24)ND6MO : up to 3 indoor units;
• GWHD(30)ND6MO : up to 4;
• GWHD(36)ND6MO : up to 4;
• GWHD(42)ND6MO : up to 5.

In a serious installation article, it is preferable to retain this detail rather than inventing a capacity that cannot be verified.

The condensate drain: the invisible component that can ruin a good installation

An indoor unit produces water in cooling mode.

This water comes from the moisture in the air. It condenses on the cold coil, then falls into an internal pan before being discharged through the drain.

The drain must have an adequate slope along its entire length. An improper slope can cause:

• water running down the wall;
• odors;
• gurgling noises;
• accumulation in the pan;
• of damage to the finishes;
• of moisture around the unit.

When selecting the location of each head, we therefore already consider the drain route.

An aesthetically pleasing position that cannot drain naturally is not necessarily a good choice.

Refrigerant lines must remain discreet yet accessible

Behind each head are several components:

• the liquid line;
• the gas line;
• the insulation;
• the communication cable;
• the condensate drain.

The GREE technical sheet specifies connections for this series measuring 1/4 in. on the liquid side and 3/8 in. on the gas side.

In a three-head installation, route management quickly becomes more complex. All three sets must reach the outdoor unit without creating a disorganized network indoors or on the façade.

We plan the route before drilling the wall to limit detours, protect the insulation, and facilitate any future service work.

This Massueville project shows why comfort begins indoors, well before the heat pump starts up

A wall-mounted head must be accessible for maintenance

The image shows a unit installed in a relatively clear position.

This is important because the homeowner will need to regularly open the front panel to access the filters.

If a head is installed immediately beneath the ceiling, above an inaccessible bookcase, or hidden behind a piece of furniture, something as simple as cleaning the filter becomes inconvenient.

And when maintenance is inconvenient, it is often postponed.

Dust-laden filters reduce airflow. The system may then:

• take longer to reach its setpoint;
• become noisier;
• accumulate more dust on the heat exchanger;
• dehumidify less effectively;
• consume more.

In a 3-head heat pump, all three units must be maintained, even if some are used less often.

Indoor noise depends greatly on the location

The sound level of a wall-mounted unit depends not only on its technical specifications.

Even a quiet head can become bothersome if it blows directly toward the head of the bed or is installed on a very lightweight partition adjacent to a quiet room.

We therefore consider nighttime operation when deciding where to install a unit in a bedroom.

The minimum airflow must be able to circulate freely without forcing the user to turn off the system simply because the airflow is poorly directed.

A different temperature in each room, without multiplying the outdoor units

The main advantage of a 3-head GREE heat pump is to create several comfort zones while keeping a single outdoor unit.

In a house where the bedrooms are far from the living room, a single central head cannot always distribute air properly when the doors are closed.

With three indoor units:

• the main room receives its air directly;
• a bedroom can maintain its own temperature;
• a third zone can operate according to its occupancy schedule.

This approach is often more effective than trying to oversize a single head in the hope that the air will reach every room.

Indoor sizing is just as important as outdoor sizing

A common mistake is to choose the three heads simply based on floor area.

We also analyze:

• the number and size of windows;
• solar orientation;
• the insulation;
• the exposed walls;
• the ceiling height;
• the electrical equipment present;
• the number of occupants;
• natural air circulation.

A 150 sq. ft. room with significant sun exposure can sometimes represent a different load from another room of the same size facing north.

The system must therefore be designed zone by zone.

R32: a new platform that requires an adapted installation

The series is clearly designated Free Match R32.

R32 belongs to the A2L category, and the documentation mentions an included A2L leak detection sensor.

The installation procedures, tools used, and service methods must be suited to the refrigerant.

A professional installation includes, among other things:

1. properly making the connections;
2. leak testing;
3. evacuating the system;
4. validating the pipe lengths;
5. verifying communications;
6. checking the drains;
7. testing each indoor unit;
8. testing the simultaneous operation of the zones.

A pipe run that can become substantial on a three-head project

Depending on the selected outdoor unit, the technical data sheet indicates a maximum total length of up to 100 m for certain models. The permitted elevation differences can reach up to 25 m.

This flexibility makes it possible to serve rooms that are far from one another.

However, this does not mean that we should intentionally create long runs. We always seek a logical, protected route to limit:

• unnecessary losses;
• the lengths of exposed insulation;
• the number of bends;
• the risk of damage;
• the difficulty of maintenance.

ENERGY STAR, AHRI, and rebate eligibility

The technical data sheet lists different AHRI numbers for un-ducted, ducted, and mixed, along with an ENERGY STAR identification in the product range table.

The documentation also mentions eligibility for local rebates.

For an actual installation in Massueville, however, we must verify the precise combination of the outdoor unit and the three indoor units before confirming eligibility or an amount.

Programs may require:

• a specific AHRI number;
• a building category;
• efficiency criteria;
• proof of purchase;
• proof of installation;
• a specific installation date.

We therefore avoid promising a discount solely because the product appears to be eligible in a general brochure.

Warranty: keep the documents from the very first day

The documentation indicates a 10-year standard warranty and mentions an additional two-year extension through Wolseley when the product is registered or proof of installation is provided.

After a multi-zone installation, it is useful to keep the following together:

• the invoice;
• the outdoor unit model;
• the three indoor models;
• the serial numbers;
• the AHRI number;
• registration records;
• warranty documents.

This organization makes any service request several years later much easier.

Errors we avoid on this type of indoor installation

Installing the head too close to the ceiling

Insufficient space can restrict airflow and make the filter difficult to remove.

Choosing the location based solely on aesthetics

The head must first and foremost be able to distribute air properly and drain its condensate.

Blowing directly onto an occupied area

A continuous stream of cold air directed toward a bed or sofa quickly becomes uncomfortable.

Completely concealing access points

The unit must remain accessible for cleaning and servicing.

Underestimating the drain

A perfectly straight head with a poorly designed drain can cause more problems than a slightly less symmetrical installation with proper drainage.

Using the same capacity in every room without calculation

The needs of three zones can be very different.

An installation designed for many years of use

This installation in Massueville illustrates a fundamental aspect of our work at AirGreen: invisible details matter just as much as the final appearance.

The photograph shows a very cleanly integrated indoor unit, mounted high and in an unobstructed area. But behind this apparent simplicity are the capacity selection, refrigerant line routing, drain, wiring, clearances, communication with the outdoor unit, and balance with the other two zones of the home.

A GREE Free Match R32 three-head heat pump is particularly appealing because it allows several rooms to be treated with greater precision. To take advantage of this benefit, the three units must be considered individually and then integrated into a single comfort strategy.

At AirGreen, we carry out installations of multi-zone heat pumps, of wall-mounted air conditioners and HVAC in Massueville and in several areas of Greater Montreal, including Montreal, Laval, Longueuil, the North Shore and the South Shore.

Our goal remains the same: select an appropriate capacity, position each head intelligently, and design an installation that remains practical to use, clean, and maintain well beyond the first season.