In a narrow side passage, installation quality comes down to details that become invisible after commissioning
On this project carried out in La Prairie, on Montreal’s South Shore, we installed a GREE Free Match R32 3-head heat pump in an outdoor environment where the available space had to be used precisely. The photo taken during our work shows a situation highly representative of properties on Montreal’s South Shore: an outdoor unit placed in a side passage, a window immediately nearby, a wooden fence parallel to the building, exterior siding already completed, and a service area that allows no room for improvisation.
The image mainly captures an interesting moment during an HVAC installation that the homeowner rarely sees: the unit is being connected and inspected, several technical tools are still placed on top of the cabinet, the refrigerant lines reach the service panel, and a measuring instrument is installed near the connections.
In other words, the heat pump is physically in place, but our work is not finished. This is precisely the stage at which much of the system’s future reliability is determined.
A heat pump can be perfectly straight, clean, and attractive while having been improperly commissioned. Conversely, a methodically completed installation involves several operations that become completely invisible when we hand the system over to the customer: copper preparation, connection checks, leak testing, vacuum evacuation, electrical validation, identification of the three circuits, and operational testing of each indoor unit.
A particularly tight outdoor location
The layout visible in La Prairie imposed several simultaneous constraints.
On one side is the house wall with its light-colored siding, a large window, and the electrical equipment. On the other side, a wooden fence reduces the available width. The outdoor unit must therefore coexist with all these elements without compromising airflow or making future service work impossible.
In particular, we had to consider:
- the distance between the condenser and the fence;
- air circulation around the outdoor coil;
- the fan’s air discharge;
- access to the service panel;
- the route of the refrigerant lines;
- the location of the outdoor electrical equipment;
- the proximity of the window;
- the space required for servicingHVAC maintenance;
- protecting the lines once the work is complete.
A location that seems sufficient simply to “fit” the unit can become problematic if the technician can no longer reach the valves or remove a panel a few years later.
We therefore never consider only the heat pump's footprint. We also look at the space that will remain around it once the system is fully connected.
The wooden fence changes how we position the condenser
The presence of a fence facing or near an outdoor unit deserves particular attention.
A heat pump moves a considerable amount of air. Depending on the model of the GREE Free Match R32, the technical sheet indicates an outdoor airflow ranging from 1,354 to 3,413 ft³/min. The stated sound pressure level at high speed, meanwhile, ranges from 54 to 63 dB(A).
A fence placed too close can disrupt this airflow. It can also reflect some of the noise back toward the house or the neighboring property.
Our goal is therefore to preserve functional clearance, not merely comply with an aesthetic guideline.
In a narrow passage like this, every available inch counts. We need to find a position that allows all of the following simultaneously:
- adequate airflow;
- technical access;
- a reasonable route along the building;
- a clean line installation;
- a safe distance from the surrounding elements.
A nearby window: a detail that influences the installation
The window immediately behind the unit also dictated certain decisions.
We must ensure that a line cover, pipe, or cable does not prevent a window from opening or complicate its future replacement. The owner must also be able to clean the glass and maintain the frame without dismantling part of the HVAC system.
In this installation with La Prairie, the technical routes were therefore organized vertically along a relatively narrow strip of the wall rather than occupying the entire facade.
This strategy is particularly useful on properties where doors, windows, patios, and fences leave very little free surface.
The vertical route of the lines keeps the facade organized
Next to the window, a vertical route can be seen grouping the technical components associated with the installation. This method makes it possible to concentrate the lines in a defined area instead of dispersing pipes and wires across several parts of the wall.
For a three-head heat pump, this organization becomes even more important than with a single unit.
Three indoor units mean several connections that must return to the same outdoor condenser. We therefore need to plan:
- the copper lines for each zone;
- their insulation;
- communication wires;
- condensate drains;
- penetrations through the building envelope;
- the exterior protection of the various routes.
The more zones the system has, the more visible poor planning becomes.
A route decided on afterward can create a network of intersecting conduits, unnecessary changes of direction, and complicated interventions for future servicing.
A three-head heat pump does not automatically correspond to a specific BTU rating
An important point for homeowners comparing quotes: “Three heads” does not necessarily mean 24,000, 30,000, or 36,000 BTU/h.
The GREE Free Match R32 range includes several outdoor units capable of accommodating three indoor units. The technical table on page 2 of the documentation indicates, among other things:
| Outdoor model | Number of connectable indoor units | Rated cooling | Rated heating |
|---|---|---|---|
| GWHD(24)ND6MO | 2 to 3 | 24,000 BTU/h | 24,000 BTU/h |
| GWHD(30)ND6MO | 2 to 4 | 28,400 BTU/h | 30,000 BTU/h |
| GWHD(36)ND6MO | 2 to 4 | 36,000 BTU/h | 36,000 BTU/h |
| GWHD(42)ND6MO | 2 to 5 | 42,000 BTU/h | 44,300 BTU/h |
These options appear directly in the manufacturer's performance table.
The photo does not make it possible to read the full model number of the unit installed in La Prairie with certainty. We therefore avoid artificially assigning it a specific capacity.
The right capacity must be determined based on the actual needs of the three zones.
How we balance the three zones
A house does not lose or gain the same amount of heat in each of its rooms.
A second-floor bedroom exposed to the sun may have very different cooling needs from a basement. A large open-plan area with several windows may require more capacity than an enclosed room of the same size.
When we prepare a multi-zone installation, we consider, among other things:
- the area of each zone;
- ceiling height;
- sun exposure;
- the amount of glazing;
- the quality of the insulation;
- the building's airtightness;
- the number of floors;
- communication between rooms;
- winter heating requirements;
- the capacities permitted by the selected GREE combination.
This analysis avoids a common mistake: choosing three indoor units based on the home's total area without considering the specific load of each room.
Why a single outdoor unit may be preferable to three single-zone systems
In the side passage visible at this La Prairie property, installing three individual condensers would have taken up a great deal of space.
The system Free Match R32 allows several indoor units to be connected to a single outdoor unit. Depending on the model, the documentation specifies that two to five indoor units can be connected.
With a three-head configuration, the homeowner therefore benefits from three comfort zones while limiting the outdoor footprint.
This helps preserve more space:
- near the fence;
- around the windows;
- for access to the backyard;
- for maintenance work;
- for other equipment on the property.
However, it is important to understand that a multi-zone system does not consist of three completely independent heat pumps. The three indoor units share the same outdoor unit and must operate in a compatible mode.
Inverter technology particularly suited to a multi-zone system
GREE documentation identifies the G10 Inverter technology, intelligent defrost, self-diagnostics, automatic voltage adaptation, and quiet operation among the range’s features. It also specifies that the system can be paired with several types of indoor units and that an A2L leak detection sensor is included.
Compressor modulation is particularly relevant in a three-zone system.
Suppose only one bedroom calls for heating while much of the house is already comfortable. The system can adjust its operation to a partial demand rather than systematically treating the residence as if all three zones required full capacity.
This modulation helps maintain more stable temperatures and reduce unnecessary on-off cycles.
Up to 21 SEER2 and 10 HSPF2
The GREE Free Match R32 technical sheet indicates performance of up to 21 SEER2, 12.5 EER2 and 10 HSPF2. It also specifies an operating range of -30 °C to 48 °C in cooling mode and -30 °C to 24 °C in heating mode.
The detailed table shows a SEER2 of 21 and an HSPF2 of 10 for the five outdoor models listed. The EER2 is 12 or 12.5, depending on capacity.
For a residence in La Prairie and the South Shore, the ability to operate at low temperatures is an important factor when making a selection.
However, two concepts must be distinguished:
minimum operating temperature and heating capacity available at this temperature.
A unit advertised as operating down to -30 °C does not necessarily provide its full rated capacity at -30 °C. We therefore need to examine the system’s performance under winter design conditions and relate it to the building’s actual heat loss.
The site photo shows the stage that often determines reliability for the years to come
The tools on the unit tell an important part of the installation story
In the photo, several tools are still arranged on top of the GREE unit: hand tools, copper preparation instruments, small connection parts, and a measuring device near the valve area.
This indicates that the photo was taken during the technical work, not after the final site cleanup.
For us, this step is essential.
The installation of a R32 heat pump does not end when the condenser is placed near the wall and the three heads are mounted indoors.
We still need to inspect the entire refrigeration circuit.
The quality of the flares is critical
The refrigerant lines of a wall-mounted heat pump use fittings that must be prepared precisely.
An improperly made flare may have:
- a crack;
- an uneven surface;
- an inadequate diameter;
- an edge that is too thin;
- misalignment;
- insufficient or excessive tightening.
A tiny leak may not be immediately noticeable. The system may operate normally for several weeks or months before a loss of performance becomes apparent.
That is why preparing the copper lines is one of the most important steps in an installation, even if the customer will never see it once the service cover is closed.
R32 connection requires methodical commissioning
The GREE data sheet identifies R32 as the refrigerant for this range. It specifies that the different models contain between 900 and 2,700 g of factory-charged refrigerant, depending on their capacity.
After connecting the lines, our procedure includes, among other things:
- inspection of the connections;
- leak testing;
- pressurization according to the applicable procedure;
- evacuation;
- validation of system stability;
- verification of the installed lengths;
- any necessary adjustment to the refrigerant charge;
- testing the three zones.
The instruments visible on the job site are therefore not merely accessories. They are used to confirm that the circuit has been prepared correctly before final commissioning.
A pipe length that must be measured, not estimated
A multi-zone system often involves much longer runs than a single system.
In the R32 Free Match range, the maximum permitted total length depends on the model:
- 40 m for the 18,000 BTU/h model;
- 60 m for the 24,000 BTU/h model;
- 80 m for the 28,400 and 36,000 BTU/h models;
- 100 m for the 42,000 BTU/h model.
The maximum height difference also ranges from 15 to 25 m depending on the model.
These figures become particularly important when one head is in the basement, another on the ground floor, and a third upstairs.
We plan the entire route before running the copper lines to avoid unnecessary lengths and stay within the limits specified by GREE.
The factory precharge varies considerably from one model to another
Another important technical detail appears in the table on page 2: the length covered by the initial charge is not the same for every outdoor unit.
It ranges from 10 to 50 metres depending on the model. When the applicable length is exceeded, the documentation indicates an addition of 20 g of R32 per additional metre.
It would therefore be incorrect to use the same amount of refrigerant for all GREE Free Match installations.
We need to know:
- the exact outdoor unit model;
- the actual length of the three circuits;
- the applicable precharge;
- the additional amount prescribed when necessary.
This detail is particularly important in a three-head installation, where a few extra metres in each zone can quickly add up.
Clearly defined pipe diameters
The same documentation indicates a liquid line of 1/4 po and a gas line of 3/8 po for the Free Match R32 outdoor models shown.
The copper diameter must never be chosen simply because a line is already available in the truck or because an older system used a particular size.
For a replacement, we always verify the compatibility of the existing piping before considering reusing it.
The electrical connection visible near the window
An outdoor electrical box located beneath the window, near the unit, can also be seen on the wall.
The GREE Free Match units in this documentation use a 208/230 V power supply, but their electrical requirements vary according to capacity. The MCA ranges from 14.5 to 30 A, and maximum overcurrent protection ranges from 20 to 45 A across the product line.
For units capable of receiving three heads, the values are therefore not interchangeable.
Before energizing the system, we check:
- the exact model;
- the MCA listed by the manufacturer;
- the MOCP;
- the conductor gauge;
- the circuit breaker;
- the outdoor disconnect;
- the quality of the connections;
- grounding.
A heat pump must never be electrically sized based solely on its BTU capacity.
Future servicing is planned from the day of installation
The photo clearly shows the unit’s service side, accessible from the passage. This is something we consider from the initial positioning stage.
One day, a technician may need to:
- access the valves;
- check a sensor;
- measure a voltage;
- clean the coil;
- inspect the connections;
- diagnose a circuit board;
- replace a component.
If the unit is wedged against a fence or structure, a task that should take an hour can become much more complex.
We therefore aim to preserve realistic access, even when outdoor space is limited.
Another common mistake is cluttering the space around the condenser after installation
A properly completed installation can lose some of its benefits if the surrounding environment changes.
In a side passage like the one in La Prairie, avoid subsequently storing:
- garbage cans;
- recycling bins;
- patio furniture;
- wood;
- bicycles;
- temporary panels;
- very dense plants
directly around the heat pump.
Airflow must remain unobstructed year-round.
In winter, snow and ice accumulation around the unit must also be monitored. In summer, leaves, dust, and vegetation should be removed as needed.
AHRI and ENERGY STAR: verify the actual installed combination
The GREE table provides separate AHRI numbers for the configurations non-ducted, ducted, and mixedFor example, the series of non-ducted configurations ranges from 214931586 to 214931590 depending on the outdoor unit.
This point is important for homeowners considering financial assistance.
Eligibility should not be inferred simply from the GREE logo or the Free Match R32 name. The exact combination of outdoor unit and indoor units must meet the applicable requirements of the program concerned.
The supplied sheet also indicates that the units are eligible for local rebates, without specifying a particular Quebec amount in this document.
We therefore always verify the exact references before confirming financial assistance for a customer.
A warranty that also deserves documented installation
According to the technical sheet provided, the range comes with a 10-year standard warranty, with an additional two-year extension from Wolseley when the registration and/or proof-of-installation requirements are met.
We recommend keeping:
- the invoice;
- exact models;
- serial numbers;
- AHRI references;
- warranty documentation;
- proof of registration;
- photos of the rating plate.
These documents are much easier to organize at the time of installation than several years later when making a warranty claim.
This La Prairie project illustrates a reality of our trade
A photo of a completed installation often highlights a neatly positioned heat pump and a few well-aligned conduits. This photo shows something different and, to us, equally important: the technical work before closing the panel and the installers' departure.
The tools shown around the GREE Free Match R32 are a reminder that a professional installation includes numerous checks before the owner can simply press the remote control.
On this project in La Prairie, we had to combine:
- a three-zone configuration;
- a restricted outdoor passage;
- the proximity of a fence;
- a window to preserve;
- a vertical piping route;
- an outdoor electrical connection;
- access to the refrigeration connections;
- precise commissioning of an R32 system.
This coordination is what allows a multi-zone installation to remain practical to maintain and consistent with the building.
At AirGreen, we carry out this type ofGREE heat pump installation, multi-zone system and wall-mounted air conditioner in Montréal, Laval, Longueuil, on the North Shore and on the South Shore, particularly in La Prairie and neighboring municipalities.
Our work does not simply consist of finding a place to install an outdoor unit. We analyze the home as a whole: the needs of the three zones, piping routes, architectural constraints, electrical supply, service access, and the actual conditions in which the heat pump will have to operate summer after summer and winter after winter.