Installation of a 3-head GREE FreeMatch R32 heat pump in L’Île-Bizard–Sainte-Geneviève, Montreal

Three comfort zones, discreet wall integration, and a single outdoor unit

At Île-Bizard–Sainte-Geneviève, we completed an HVAC installation based on a multi-zone GREE FreeMatch R32 three-head heat pump. The principle seems simple: three indoor units connected to a single outdoor unit. In practice, the quality of the result depends on a series of precise decisions regarding sizing, the placement of the wall-mounted heads, the routing of the refrigerant lines, condensate drainage, electrical supply, and commissioning.

The jobsite photo shows one of the three GREE wall-mounted heads. It is installed high up, properly aligned beneath the ceiling, with visible clearance above the unit to allow air intake. The louvers are open, and the display indicates 16 °C, a setting compatible with a cooling operation test. The framing shows neither piping nor a line-set cover around the indoor unit, resulting in a clean, unobtrusive finish in the room.

This image illustrates an important point: a good 3-head heat pump is not judged solely by its performance specifications. It must also integrate cleanly with the building, distribute air without creating uncomfortable drafts, and remain accessible for maintenance.

A multi-zone project that requires careful planning

A three-head installation is not equivalent to three independent wall-mounted air conditioners. The three indoor units share the outdoor unit’s capacity. Each zone can have its own temperature setting and fan speed, but the available capacity varies according to the number of heads calling for operation at the same time.

Therefore, before installation, we must consider in particular:

• the heating and cooling load of each zone;
• sun exposure and window area;
• the level of insulation;
• ceiling height;
• the natural circulation of air between rooms;
• the length and elevation difference of the lines;
• the necessary slope for each condensate drain;
• the electrical panel capacity and the protection required by the selected model.

The number of heads alone does not determine the outdoor capacity. A small room with lots of glazing may require more than a larger room located on the north side. Conversely, oversizing a head can cause excessively short cycles, less stable dehumidification, and more pronounced temperature variations.

Why the GREE FreeMatch R32 platform suited a three-head configuration

The GREE FreeMatch R32 lineup offers several outdoor units compatible with different numbers of indoor units. According to the technical table on page 2, the 24,000 BTU/h model accepts two to three units, the 30,000 and 36,000 BTU/h models accept two to four, and the 42,000 BTU/h model can power two to five. All the units shown operate at 208/230 V.

The outdoor unit and its nameplate are not shown in the supplied photo. We therefore do not assign a specific capacity without a model reference, nameplate, or quotation document. This rigor is important: in a multi-zone heat pump installation, the capacity, circuit breaker, precharged line-set length, and AHRI number must correspond to the model actually installed, not to an estimate based on the number of heads.

Seasonal performance and operation in cold weather

The first page of the GREE data sheet lists up to 21 SEER2, 12.5 EER2, and 10 HSPF2. It also indicates a cooling range of −30 °C to 48 °C, a heating range of −30 °C to 24 °C, and a total line-set length of up to 100 m, depending on the outdoor unit selected.

These data are particularly relevant in Greater Montreal. A heat pump intended for L’Île-Bizard–Sainte-Geneviève, Laval, Longueuil, the North Shore, or the South Shore must be able to handle significant variations between summer heat, humid periods, and below-freezing winter temperatures.

However, the “up to” qualification must be interpreted correctly. Actual performance depends on the combination of indoor units, outdoor temperature, simultaneous demand from the three zones, line-set length, and the quality of commissioning. A high rating never compensates for improper capacity selection or an incorrect refrigerant charge.

A flexible platform for several types of indoor units

The documentation presents up to seven indoor unit options and specifically mentions self-diagnostics, intelligent defrosting, automatic voltage adaptation, G10 inverter technology, quiet operation, and an included A2L leak detector.

In this project, the photo confirms the use of a white GREE wall-mounted head. This format works well when air must be projected into a room without occupying floor space. Installing it high also promotes air mixing, provided the required clearance is maintained and the louvers are properly directed.

The steps that determine the quality of a three-head installation

1. Position each head according to the room, not just the available wall

We look for a location that allows air to circulate through the area without blowing directly onto a bed, sofa, worktable, or heavily trafficked passage. We also avoid placing the head in a corner where cold or warm air would be immediately drawn back into the unit.

On the unit visible in L’Île-Bizard–Sainte-Geneviève, the head is installed near the ceiling while maintaining an air-return space. The front remains accessible for filter cleaning. This detail facilitates HVAC maintenance and reduces the risk that a homeowner will postpone cleaning because the appliance is difficult to open.

2. Design the route for the lines and drains before drilling

Each head requires refrigerant lines, a communication cable, and a drain. The shortest route is not always the best. We must consider the structure, drain slope, outdoor protection, and final appearance.

The technical specifications indicate connection diameters of 1/4 in. for liquid and 3/8 in. for gas on the outdoor units presented, along with length and elevation-difference limits that vary according to capacity. These limits are used to validate the project; they should not be treated as an invitation to add unnecessary detours. The longer the network, the more critical measurement, the additional charge, and connection quality become.

The drain deserves the same attention as the refrigeration circuit. An insufficient slope, a reverse slope, or a pinched pipe can cause water to back up into the wall-mounted head. In a three-head installation, all three drains must be checked separately.

3. Adapt the electrical supply to the outdoor unit actually installed

The FreeMatch R32 range operates on 208/230 V, but the maximum protection varies by model. The specification sheet indicates, among other things, an MOCP of 25 A for the 24,000 BTU/h unit, 35 A for the 30,000 BTU/h unit, and 45 A for the 36,000 and 42,000 BTU/h units.

We never choose the circuit breaker based on an approximate rule. We use the nameplate, installation manual, circuit length, and applicable requirements. This check prevents two common errors: insufficient protection that trips unnecessarily, or oversized protection that does not meet the manufacturer’s requirements.

4. Make the R32 connections using an A2L-compatible procedure

The R32 requires a work method suited to the refrigerant and its A2L classification. Flared connections must be clean, properly formed, and tightened according to the specifications. The system must be leak-tested and then evacuated with appropriate instruments before the service valves are opened.

The included leak detector mentioned in the documentation provides additional protection, but it does not replace:

• a rigorous leak test;
• a measured vacuum evacuation;
• checking the connections;
• calculating the additional charge when the length requires it;
• the use of tools compatible with R32.

A clean installation behind the cover is just as important as the visible finish on the wall.

5. Commission all three zones and check their operation together

Commissioning does not consist of confirming that just one head blows cold air. We test all three units, the remote controls, modes, louvers, airflow rates, drains, communications, and the outdoor unit.

We also check how the system behaves when several zones call for heating or cooling simultaneously. This step is essential because the outdoor unit’s capacity is distributed among the active indoor units. A system may seem perfect with only one head operating and show an imbalance when all three start.

The 16°C setting shown in the photo most likely corresponds to a test setting. For everyday summer use, constantly maintaining such a low setting increases demand, prolongs operation under heavy load, and can make certain areas uncomfortable. A more moderate setting, combined with automatic fan operation and zone-specific door management, generally provides more stable comfort.

What this installation provides the homeowner and mistakes to avoid

Zone control without multiplying outdoor units

The main advantage of a GREE FreeMatch R32 3-head heat pump is the ability to serve three spaces with a single outdoor unit. This design reduces the footprint on the façade or near the building and simplifies the overall installation layout.

Each head can be adjusted according to the occupancy of its zone. A room that is rarely used does not need to operate with the same setpoint as a space occupied all day. This modulation can improve comfort and limit unnecessary demand, provided the system is used consistently.

With a multi-split system, the indoor units generally share the same overall mode: they can heat together or cool together, but they are not designed to heat one zone while another calls for cooling. This limitation must be explained when the system is handed over, especially in homes where some rooms receive a great deal of sunlight.

The costliest mistakes with a multi-zone heat pump

Choosing capacity by simply adding up the heads' BTUs

The sum of the indoor unit rated capacities must not be used as the sole selection method. The calculation must account for load diversity and simultaneous use. An outdoor unit that is too small may lack capacity during peak demand. An oversized unit may operate less stably at low demand.

Installing the heads where pipe routing is easy but airflow is poor

The location should first and foremost serve comfort. A head installed too close to an obstruction, too tightly against the ceiling, or aimed directly at occupants can lead to complaints even when the equipment is operating properly.

Neglecting condensate drainage

A poorly designed drain can cause stains, odors, drainage noises, or an indoor leak. We check every slope and outlet, then test drainage before closing the openings.

Forgetting the AHRI combination and warranty documents

The FreeMatch R32 documentation lists separate AHRI references for non-ducted, ducted, and mixed configurations. For a rebate application or proof of performance, the number must match the combination actually installed.

The product sheet mentions a standard 10-year warranty as well as an additional 2-year extension with Wolseley, subject to product registration and/or presentation of proof of installation. It also indicates that the range may be eligible for local rebates. However, final eligibility depends on the exact model, the associated indoor units, the criteria of the program in effect, and the quality of the application submitted.

Usage tips after installation

To maintain good performance across all three zones, we recommend simple and regular use:

1. clean the filters of each head according to usage and the amount of dust;
2. avoid blocking airflow with curtains or tall furniture;
3. keep clear space around the outdoor unit;
4. watch for any drainage noise or signs of water;
5. use realistic settings rather than systematically setting the temperature to 16 °C;
6. plan HVAC maintenance covering all three indoor units, the drains, and the outdoor unit.

On a multi-zone system, a single very dirty head can disrupt overall operation. Maintenance should therefore not be limited to the most frequently used room.

A visible finish that reflects the care taken with the rest of the system

On this installation in L’Île-Bizard–Sainte-Geneviève, the visible result is clean: straight wall-mounted unit, clearance maintained, accessible façade, no visible lines in the framing, and an operating appliance. This understated appearance is the desired result for a residential installation where the equipment must provide comfort without visually dominating the room.

At AirGreen, we apply the same method to our heat pump, wall-mounted air conditioner, and HVAC installation projects in Montreal, Laval, Longueuil, on the North Shore, and on the South Shore: validate the capacity, plan the routing, protect the drainage, comply with electrical requirements, test the refrigeration circuit, and hand over a system whose operation the homeowner truly understands.

The GREE FreeMatch R32 is well suited to projects where three zones need to be managed separately with a single outdoor unit. However, its value depends on the exact selection of components and the precision of the installation. It is this combination of equipment, calculations, and execution that turns a three-zone heat pump into a durable comfort solution.