Installation of a 3-head GREE FreeMatch R32 heat pump in Saint-Césaire, in Montérégie

A multizone installation on an outdoor terrace where passage, openings, and service access had to be preserved

On this project in Saint-Césaire, the difficulty was not simply finding a place large enough to set down a heat pump. The outdoor unit had to be placed on an accessible outdoor surface, such as a rooftop terrace, immediately next to a door, a window, a metal railing, and a brick wall. The available space was real, but every positioning decision had consequences for circulation, vibrations, airflow, piping, and future maintenance.

We installed a GREE FreeMatch R32 3-head heat pump, allowing three indoor zones to be supplied by a single outdoor unit. This configuration is particularly relevant here: adding multiple condensers to this terrace would quickly have cluttered the space and complicated access.

The site photo shows the exterior result. The GREE unit is installed on an elevated metal structure, itself positioned on long support members that distribute the load across the surface. The unit is raised off the ground, its fan remains directed toward an open area, and the lines are routed along the bottom of the wall before reaching the technical side of the machine.

This arrangement results from several constraints that we had to address together rather than separately.

A condenser positioned between a door, a window, and a railing

The immediate surroundings of the heat pump are clearly visible in the photo.

To the right is a door leading directly onto the terrace. A narrow window is installed right beside it. To the left, a metal railing borders the outdoor space. Behind the machine, the brick wall naturally limits the available depth.

In such a configuration, we must preserve:

• a usable passage in front of and around the machine;
• access to the door;
• reasonable clearance in front of the fan;
• sufficient space around the service panel;
• a logical route for the three refrigerant circuits;
• a position that does not unnecessarily concentrate vibrations near the openings.

The outdoor unit was therefore not simply placed against the first available surface. Its orientation had to allow the air discharged by the fan to leave the area rather than be immediately redirected toward the coil.

Avoid recirculating hot or cold air

The fan of an outdoor unit moves a considerable volume of air. If this air immediately encounters a wall, screen, or obstacle, some of it may return toward the coil.

In cooling mode, this recirculation can cause the unit to operate with outdoor air that has already been warmed by the condenser. In heating mode, the same principle can affect the conditions around the coil.

The positioning visible in Saint-Césaire keeps the GREE’s large ventilated front facing the open space of the terrace.

This decision is particularly important for a multi-zone heat pump, because when several indoor heads operate simultaneously, the outdoor unit may be required to provide a substantial load for extended periods.

Why we elevated the GREE FreeMatch R32

The unit rests on a metal support that keeps it well above the surface.

This elevation serves several purposes.

First, it provides greater protection for the lower part of the heat pump against the accumulation of leaves, small debris, and snow.

Second, it leaves room for the water generated during winter defrost cycles.

Third, it facilitates visual inspection beneath the unit.

GREE documentation indicates that the FreeMatch R32 range notably incorporates a smart defrost.

In cold-weather heating mode, frost may form on the outdoor coil. When the system defrosts, this ice becomes water. On an outdoor surface in Quebec, this water may then refreeze.

A machine installed almost at ground level could eventually become surrounded by a mass of ice. An elevated installation leaves more clearance before this accumulation can reach the base of the unit.

The long supports beneath the bracket: an important part of the work

One detail visible in the photo deserves particular attention: the metal structure does not rest directly on small feet concentrated at four points.

We used long support members beneath the bracket, which helps distribute the load more evenly across the outdoor surface.

This precaution is especially important when HVAC equipment is installed on a membrane, a terrace, or a surface where we want to avoid excessive point loads.

Depending on the selected outdoor model, the FreeMatch R32 units weigh between 35.5 kg and 79 kg. Models that can accommodate three heads start at approximately 51 kg for the 24,000 BTU model and reach nearly 79 kg for the larger capacities.

This mass is supplemented by:

• compressor vibrations;
• fan movement;
• technician interventions;
• the stresses produced by the piping;
• the seasonal effects of freezing and thawing.

The support is therefore a technical component of the installation, not merely an accessory intended to achieve a certain height.

Three indoor heads with a single outdoor mechanical unit

The GREE FreeMatch R32 is designed precisely for this type of multi-zone project.

The range includes different outdoor units that can accommodate multiple indoor units. GREE’s technical table indicates:

These capacities and connection options are listed in the manufacturer’s specification sheet.

The 18,000 BTU model shown in the same family accepts only two indoor units. It therefore does not correspond to a three-head installation.

The photo of this installation does not show the outdoor unit’s complete model number clearly enough to confirm its exact capacity. We therefore prefer not to arbitrarily assign 24,000, 30,000, or 36,000 BTU to this installation.

Why the number of heads does not determine the BTUs

A 3-head heat pump is not automatically a 36,000 BTU heat pump.

Sizing must begin with the requirements of the three indoor zones.

We analyze the following for each:

1. floor area;
2. ceiling height;
3. the number of walls facing outdoors;
4. the windows;
5. solar exposure;
6. the level of insulation;
7. air infiltration;
8. the building location;
9. occupancy habits.

A large open room exposed to the sun may require more capacity than a smaller, better-insulated bedroom.

We then select a combination of indoor units compatible with the appropriate GREE outdoor unit.

Three identical heads are not always desirable

It would be simple to install three units with the same capacity because the configuration has three zones. However, this approach is not always the best.

An oversized head can reach its setpoint very quickly and reduce its operation while another zone is still calling for heating or cooling.

In cooling mode, excessive oversizing can also reduce the time available to remove humidity from the air.

The goal is therefore to distribute capacity properly, rather than maximize the BTUs of each head.

Up to 21 SEER2 for the FreeMatch R32 range

The specification sheet provided by GREE states that efficiency can reach:

• 21 SEER2;
• 12.5 EER2;
• 10 HSPF2.

These values make energy efficiency an important criterion when comparing a multi-zone heat pump.

The technical table on page 2 also indicates a SEER2 of 21 and an HSPF2 of 10 for the listed outdoor units, with an EER2 that varies according to capacity.

However, the performance indicated on the specification sheet does not automatically guarantee the same performance in every installation.

The actual result also depends on:

• system sizing;
• outdoor temperatures;
• the number of heads calling for heat;
• the quality of the vacuum pull-down;
• the refrigerant charge;
• filter cleaning;
• the clearance around the outdoor unit;
• the temperatures requested by the occupants.

Operation down to -30 °C in heating mode

For an installation at Saint-Césaire, winter performance is a major factor in equipment selection.

GREE specifies an operating range from -30 °C to 24 °C in heating mode and -30 °C to 48 °C in cooling mode.

The ability to operate down to -30 °C is relevant to our climate, but this information must be understood correctly.

The minimum operating temperature does not necessarily represent the rated capacity available at that temperature.

During extremely cold weather:

• the house loses more heat;
• the heat pump may provide a capacity different from its rated value;
• several zones may call for heat simultaneously;
• the system must perform defrost cycles.

We therefore incorporate low-temperature behavior into the sizing rather than relying solely on the capacity displayed prominently on the specification sheet.

A multi-zone installation requires more piping

One of the visible elements of this installation is the black run along the base of the wall.

On a single-zone heat pump, we manage one main pipe set. On a GREE 3 heads, several branches must connect to the outdoor unit.

Each indoor unit requires, among other things, a refrigerant line set and appropriate wiring.

The manufacturer specifies for the listed outdoor units:

• 1/4 in. for the liquid pipe;
• 3/8 in. for the gas pipe.

Above all, make sure the connections are matched correctly.

The pipe for zone A must match the wiring for zone A. The same logic applies to zones B and C.

A mismatched connection can lead to communication problems or incorrect behavior during commissioning.

Why the run follows the bottom of the wall

On this job, the visible run remains relatively low before joining the outdoor unit.

This configuration helps preserve the appearance of the wall while keeping the pipes grouped together.

It also helps avoid unnecessarily crossing the opening area.

However, we must ensure that the pipes:

• do not rub directly against the masonry;
• do not create points where water can accumulate unnecessarily;
• remain supported;
• retain their insulation;
• remain accessible when necessary.

Finishing work is particularly important near a door. The passage must remain clear, and occupants must not be able to accidentally snag a cable or pipe.

Up to 100 meters of total length depending on the selected outdoor unit

One of FreeMatch's technical advantages is the available piping length on certain configurations.

The specification sheet indicates a maximum total length of:

• 40 m on the 18,000 BTU;
• 60 m on the 24,000 BTU;
• 80 m on the 30,000 and 36,000 BTU;
• 100 m on the 42,000 BTU.

The maximum height difference varies from 15 to 25 m depending on the model.

This flexibility makes projects easier when the three indoor units are installed in different parts of the building.

However, we do not aim to maximize the length. A shorter, more direct route is generally easier to install, protect, and maintain.

The R32 charge must be adjusted according to the actual routing

The FreeMatch range uses R32 refrigerant.

The specification sheet also indicates that each model has a precharged length, then provides for adding refrigerant when the system exceeds the conditions covered by the factory charge.

On a three-head system, the total length must be tracked accurately.

An approximation can result in an incorrect charge and affect:

• heating capacity;
• cooling capacity;
• operating temperatures;
• energy consumption;
• long-term reliability.

The documentation also mentions a A2L leak-detection sensor included in the range.

Since R32 is an A2L-category refrigerant, its installation requires appropriate methods and tools.

Our refrigeration procedure before commissioning

For each branch, we pay attention to the same steps.

Line preparation

The copper must be cut cleanly and prepared without introducing debris inside.

Flaring

Flared connections must have a smooth surface and be tightened according to specifications.

Leak test

Before considering the system complete, we check for leaks.

Vacuum evacuation

Evacuation is not simply used to “remove air.” It also removes moisture present in the system before the refrigerant is introduced.

Charge verification

We take the actual piping length and the manufacturer's specifications into account.

Testing the three zones

Each head must be tested, and the different units must then be checked while operating together.

The owner can set three temperatures, but not three opposing modes

Multizone systems offer great flexibility.

One zone can be set to 21 °C, another to 22 °C, and a third can be turned off when it is not in use.

Nevertheless, the three heads share the same outdoor unit.

They therefore cannot simultaneously request contradictory modes.

One unit cannot provide cooling at the same time that another head connected to the same FreeMatch requires heating.

This is a normal characteristic of multizone systems of this design, not a malfunction.

We explain how this works to the occupants during commissioning to avoid conflicts between remote controls.

An installation designed to remain practical for several years after we leave

For us, the best location is not merely the one that allows the work to be completed quickly. It must also remain practical when the machine needs servicing.

The photo of this installation at Saint-Césaire makes it possible to observe several important features: the unit is elevated, the fan has open space, the pipes are grouped along the wall, and the unit remains accessible without taking up the entire patio walkway.

The service panel must remain accessible

A heat pump may require inspections.

A technician may need access to:

• the refrigerant connections;
• the service valves;
• the electrical connections;
• the electronic boards;
• the sensors;
• the compressor.

We must therefore prevent a future fence, outdoor storage unit, or patio furniture from being installed directly against the technical side.

The proximity of the door also requires noise and vibration management

An outdoor unit installed near an opening may be more noticeable indoors than one placed farther away.

Depending on the model, the manufacturer specifies a high-speed sound pressure level of 54 to 63 dB(A).

The perceived noise depends on much more than this single figure, however.

We must also limit:

• vibrations transmitted to the support;
• pipes touching the wall;
• metal parts that resonate;
• cables hitting the cabinet;
• unnecessary rigid contact points.

The supports beneath the feet and the stability of the structure therefore directly contribute to acoustic comfort.

Defrost water must not turn the terrace into an icy area

In the middle of winter, defrosting can produce a visible amount of water.

On a terrace or accessible surface, this aspect must be considered not only for the heat pump but also for the occupants.

We recommend regularly checking:

• the formation of ice beneath the unit;
• the path taken by the water;
• the accumulation of snow;
• the clearance in front of the fan.

A shovel must not be used aggressively against the condenser or heat exchanger.

Any accumulation must be removed around the unit without damaging the fins or piping.

All three indoor filters must be maintained

The outdoor system can be perfectly clean while just one of the three indoor heads has insufficient airflow because of its filter.

This situation may make it seem that one zone is receiving less heating or cooling than the others.

For a three-head installation, we recommend treating maintenance as a whole:

• head no. 1;
• head no. 2;
• head no. 3;
• outdoor unit.

The cleaning frequency depends on usage, dust, pets and the indoor environment.

FreeMatch offers several indoor unit options

GREE documentation indicates that the multizone range can be paired with up to seven different indoor unit options. It also mentions self-diagnostics, power supplied to the indoor units by the outdoor unit, automatic voltage adaptation and G10 inverter technology.

This flexibility makes it possible to adapt the system to the rooms rather than forcing all zones to use exactly the same type of unit.

Depending on the project, the exact configuration must naturally be validated against the combinations permitted by the manufacturer.

Electrical supply: three heads do not mean a standard circuit breaker

The FreeMatch outdoor units listed on the data sheet operate at 208/230 V.

The MCA and maximum overcurrent protection vary by capacity:

• MCA of 14.5 to 30 A;
• MOCP of 20 to 45 A.

We therefore never size the circuit by simply saying: “it’s a three-head heat pump.”

We use the nameplate values of the installed outdoor unit.

ENERGY STAR, AHRI and rebate eligibility

Page 2 of the documentation contains the AHRI numbers for the range’s ductless, ducted and mixed configurations.

For ductless systems, the listed numbers are 214931586, 214931587, 214931588, 214931589 and 214931590, depending on the outdoor unit. The table also identifies the models as ENERGY STAR.

The data sheet also specifies that the range may be eligible for local rebates.

This does not mean that the same amount automatically applies to all installations.

To determine actual eligibility, the following must be verified:

• the exact outdoor unit;
• the three indoor models;
• the AHRI number for the combination;
• the program available when the work was carried out;
• the building type;
• the required documents.

We prefer to validate these details before presenting financial assistance as guaranteed.

A warranty that must be properly documented

The technical data sheet indicates a 10-year standard warranty, as well as an additional two-year extension with Wolseley when the product is registered and/or proof of installation is provided, subject to the applicable terms.

In a three-head system, it is useful to keep:

• the outdoor model number;
• its serial number;
• the models of the three indoor units;
• their serial numbers;
• the invoice;
• the installation date;
• the AHRI reference;
• proof of registration.

Mistakes to avoid in a similar installation

Placing the unit directly on the surface

An elevated structure facilitates defrosting, load distribution, and maintenance.

Positioning the fan facing a nearby wall

Good airflow is essential for condenser efficiency.

Obstructing the passage to the door

The equipment must not make the terrace difficult or dangerous to use.

Blocking access to the service panel

An installation must be serviceable without having to dismantle the entire environment around the machine.

Allowing the lines to rub against the masonry

Vibrations can create noise and gradually damage certain materials.

Choosing three identical indoor units without performing a load calculation

Each zone has its own thermal behavior.

Simply adding up the BTUs of the indoor units

Multizone sizing must comply with the outdoor unit’s combinations and capacities.

Confusing operation at -30 °C with full capacity at -30 °C

These two pieces of information do not describe the same thing.

Announcing a subsidy based solely on the FreeMatch R32 name

The AHRI number and the complete combination must be verified.

AirGreen: designing the system around the building, not the other way around

This project in Saint-Césaire illustrates our approach to a multizone HVAC installation.

The building required a particular outdoor location: a terrace, a door, a window, a guardrail, a masonry wall, and limited circulation space.

We therefore organized the project around these constraints:

1. analysis of the three indoor zones;
2. selection of a compatible FreeMatch combination;
3. selection of the outdoor location;
4. orienting the fan toward the open area;
5. installation on an elevated structure;
6. load distribution across the surface;
7. organization of the three circuits;
8. protection of the route along the wall;
9. refrigerant system inspection;
10. electrical validation;
11. commissioning of the three indoor units;
12. vibration and noise control;
13. explanation of multizone operation to the owner.

This is the same approach we apply to our heat pump installations in Montréal, Laval, Longueuil, on the North Shore and the South Shorewhile adapting each project to its actual architecture.

In Saint-Césaire, the result provides three distinct heating and cooling zones with a single GREE FreeMatch R32 outdoor unitwhile maintaining a functional terrace and reasonable access around the machine.

The equipment is important, but lasting performance comes from the whole system: capacity, positioning, supports, lines, airflow, drainage, electrical work, commissioning, and maintenance. It is this combination of technical details that we strive to master in every AirGreen installation.