Installation of a FUJITSU AIRSTAGE ORION XLTH wall-mounted heat pump in Saint-Dominique, Montérégie
In Saint-Dominique, AirGreen installs a FUJITSU ORION XLTH R-32 heat pump on wall brackets: a compact installation suited to Quebec winters, with Inverter technology and heating down to -26 °C.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
A compact outdoor installation on wall brackets, designed for Saint-Dominique’s climate
On this Saint-Dominique property, our AirGreen team had to integrate a new FUJITSU AIRSTAGE ORION XLTH wall-mounted heat pump into a relatively narrow outdoor space along a residential wall already occupied by several technical elements. The construction photo clearly shows the reality: vinyl siding, a concrete foundation, nearby electrical equipment, a grassy side passage, and space that had to remain sufficiently clear for the occupants.
We chose an installation on metal wall brackets, slightly above ground level. This positioning keeps the outdoor unit off the ground while creating a neat route for the refrigerant lines and connections.
The visible unit is a FUJITSU AIRSTAGE ORION XLTH operating with R-32. The A2L safety label is also clearly visible on the side panel of the unit, as is the R32 marking. This new generation of heat pumps requires installation using methods, tools, and procedures appropriate for the refrigerant used.
According to the FUJITSU technical documentation provided for the ORION XLTH series, this range is designed to operate in heating mode down to -26 °C, with an Inverter compressor, a base pan heater for cold climates, and several capacity levels ranging from 09K to 24K.
In an area like Saint-Dominique, where the heat pump must withstand both summer humidity and periods of intense cold, these features are much more than a simple technical list: they directly influence daily comfort and the system’s ability to genuinely contribute to heating the home.
Why we chose wall mounting rather than installing it directly on the ground
The installation photo shows that the space available between the house and the grassy area is limited. A bulky base placed directly on the ground would have taken up more of the passageway and positioned the heat pump closer to grass, moisture, and winter accumulation.
By mounting the unit on wall brackets, we create several practical benefits.
First, the unit is easier to clear during snowfall. For a heat pump used for heating in Quebec, it is always necessary to consider what will happen in January and February, rather than only the pleasant day on which the installation is carried out.
Second, the heat pump remains away from ground vegetation. An outdoor unit draws in a great deal of air through its heat exchanger. Tall grass, leaves, dust, and debris can eventually accumulate against the fins if the immediate surroundings are not maintained.
Third, the space beneath the unit remains accessible, particularly for monitoring the drainage of water from defrost cycles.
A configuration suited to a residential side passage
This project clearly illustrates why we never position an outdoor unit based solely on the wall closest to the indoor unit.
We also consider:
- traffic around the house;
- the location of meters and electrical equipment;
- the building openings;
- the distance between the fan and obstacles;
- future access for HVAC service;
- the possible snow depth;
- the route of the refrigerant lines;
- drainage;
- vibrations;
- the ease of servicing the outdoor heat exchanger.
In the photo, the front of the unit remains largely unobstructed toward the yard. This is important because the outdoor fan must be able to discharge air without an obstacle directly in front of it causing significant recirculation.
A heat pump can be excellent on paper yet perform poorly if it is enclosed in a space that is too confined.
Protected and organized refrigerant lines along the foundation
Another detail visible in this Saint-Dominique installation is the route of the lines toward the building.
The insulated refrigerant lines are bundled and routed neatly toward the house rather than left scattered. We place great importance on the mechanical protection and organization of these connections.
In a wall-mounted heat pump installation, the piping is essential to the system’s operation. It connects the indoor evaporator to the outdoor condenser and carries the refrigerant in both directions, depending on the operating mode.
A clean installation also makes future servicing easier. When a technician returns several years later for diagnostics or HVAC maintenance, a clear line layout is a real advantage.
Warning: pipe diameters vary depending on the capacity of the ORION XLTH.
The FUJITSU ORION XLTH range does not have one universal pipe size.
According to the technical data sheet provided:
- 09K and 12K: 1/4 in. liquid line, 3/8 in. gas line;
- 15K: 1/4 in. liquid line, 1/2 in. gas line;
- 18K and 24K: 3/8 in. liquid line, 5/8 in. gas line.
This is a particularly important detail when a homeowner replaces an old heat pump.
We sometimes encounter the following idea: since the old unit had approximately the same number of BTUs, the existing lines should necessarily be suitable.
This is not a valid rule.
You must check the specific model, the diameter specified by the manufacturer, the circuit length, the elevation difference, and the condition of the existing lines before deciding to keep them.
Piping length can also influence the project design
FUJITSU specifies different maximum lengths depending on capacity:
- up to 25 m (82 ft) for the 09K and 12K models;
- up to 30 m (98 ft) for the 15K;
- up to 50 m (164 ft) for the 18K and 24K models.
The allowable vertical differences can reach 20, 25, or 30 metres, depending on the configuration.
These values provide some flexibility when the best outdoor location does not exactly match the location of the indoor unit.
Our goal, however, remains to create the most logical route possible, without unnecessarily adding piping simply because the manufacturer's maximum limit allows it.
Why the FUJITSU ORION XLTH is a particularly attractive option for heating in Quebec
A heat pump designed to operate down to -26 °C
The main advantage of the FUJITSU AIRSTAGE ORION XLTH in our market remains its cold-climate design.
The manufacturer's technical data sheet indicates a heating range from -26 °C to 24 °C for the documented models. The cooling operating range, meanwhile, extends from -10 °C to 50 °C.
In Saint-Dominique, this feature makes it possible to consider the heat pump as much more than an air conditioner that provides a little heat in the spring and fall.
A properly sized system can make a significant contribution to heating for much of the winter.
However, it remains essential to distinguish the minimum operating temperature from the actual capacity required to heat a given building. A well-insulated home and an older residence with significant heat loss will not require the same output.
The different capacities available in the series
FUJITSU documentation covers five ORION XLTH configurations:
| Outdoor model | Nominal cooling | Nominal heating | VERY2 / SEER2 |
|---|---|---|---|
| AOUH09KZAH1 | 9,000 BTU/h | 12,000 BTU/h | 33,1 |
| AOUH12KZAH1 | 12,000 BTU/h | 16,000 BTU/h | 30,5 |
| AOUH15KZAH1 | 14,500 BTU/h | 18,000 BTU/h | 27,5 |
| AOUH18KZAH1 | 18,000 BTU/h | 21,600 BTU/h | 25,5 |
| AOUH24KZAH1 | 22,000 BTU/h | 25,200 BTU/h | 24,0 |
The exact capacity of this Saint-Dominique installation cannot be confirmed with certainty from the photograph alone, since the model's detailed nameplate is not sufficiently legible.
We therefore prefer not to turn a visual estimate into technical data.
For a real project, the model is selected based on the building, not because a certain capacity appears to be “the most common.”
Performance at very low temperatures deserves particular attention
The FUJITSU data sheet goes beyond simply stating the minimum operating temperature.
At -21 °C, it indicates, depending on the model, a maximum heating percentage representing:
- 154% for the 09K;
- 124% for the 12K;
- 126% for the 15K;
- 127% for the 18K;
- 95% for the 24K.
Even at -26 °C, the listed values are still 127%, 102%, 109%, 106%, and 80%, respectively, depending on the capacities.
These figures show why it is much more relevant to examine performance at low temperatures than to compare only the nominal BTUs of two heat pumps.
For homeowners in Montréal, Laval, Longueuil, the North Shore, the South Shore, or municipalities in Montérégie such as Saint-Dominique, this is precisely the part of the technical data sheet that helps explain the true value of a cold-climate heat pump.
Inverter technology: modulating rather than always operating at full capacity
The FUJITSU ORION XLTH uses an Inverter compressor.
The principle is important: a home's heating and cooling needs constantly change. A January day at -20 °C obviously does not require the same amount of heating as an October evening at 8 °C.
The system can therefore adjust its capacity to better match demand.
The 12K version, for example, has a nominal cooling capacity of 12,000 BTU/h, but its stated range is 3,100 to 16,000 BTU/h. In heating mode, it is nominally rated at 16,000 BTU/h while being able to modulate between 3,500 and 23,600 BTU/h depending on the conditions specified by the manufacturer.
For occupants, this modulation can contribute to a more consistent temperature and less aggressive operation during periods of low demand.
The R-32 and A2L labels visible on the installation
This Saint-Dominique installation also offers a good opportunity to explain a detail that several owners are beginning to notice on new heat pumps: the label A2L.
In the photograph, the pictogram is clearly visible on the upper panel of the FUJITSU unit.
The unit operates with R-32, an A2L-classified refrigerant. This means that installation and service procedures must be adapted to the characteristics of this refrigerant and comply with applicable requirements.
FUJITSU documentation indicates a global warming potential of 675 for R-32, compared with 2,088 for R-410A, representing an announced reduction of 68%. The manufacturer also mentions that a smaller quantity of R-32 can be used while maintaining the desired performance.
For the owner, the important point is simple: the new generations of systems require installers who are also familiar with the new practices associated with their refrigerants.
The base pan heater: a discreet but important element in winter
FUJITSU states that the ORION XLTH outdoor unit has a base pan heater designed for extremely cold climate regions.
A heat pump naturally accumulates frost on its outdoor heat exchanger when operating in heating mode under certain conditions. It must then perform a defrost cycle.
The water produced must be able to drain properly from the unit.
This is precisely one of the reasons why we appreciate an elevated installation like the one carried out in Saint-Dominique: space remains beneath the condenser instead of placing its base directly on the ground.
This obviously does not relieve the owner of the responsibility to keep the area clear during the winter. A heat pump should never be buried under accumulated snow.
Sound level: important in a residential yard
In the photograph, we can clearly see that the unit is located in a residential setting: a grass-covered yard, patio, and area used by the occupants.
Sound level is therefore an important criterion.
Depending on the model, FUJITSU reports an outdoor sound level for this series of approximately 46 to 49 dB(A) in cooling and 47 to 50 dB(A) in heating.
The indoor unit can, for its part, reach as low as 23 dB(A) in quiet mode at certain capacities.
These figures are useful, but we always remind readers that proper placement remains essential. A very quiet heat pump installed between several sound-reflecting surfaces may seem more noticeable than a well-positioned unit in an open environment.
Electrical requirements that vary according to capacity
The series operates on a 208 to 230 V, 60 Hz, single-phase power supply.
The documentation states:
- a 15 A circuit breaker for the 09K and 12K versions;
- a 20 A circuit breaker for the 15K, 18K, and 24K models.
This point is particularly useful during a replacement.
We always check the existing circuit rather than assuming that the wiring and circuit breaker from the old heat pump will be compatible with the new one.
Integrated Wi-Fi and several control options
The ORION XLTH documentation also indicates integrated Wi-Fi connectivity with remote monitoring through the AIRSTAGE mobile app. The system can also work with various controller and interface options depending on the configuration.
For a homeowner, connectivity simplifies everyday use: temperature adjustment, mode changes, and system control can be carried out without necessarily being directly in front of the indoor unit.
What this Saint-Dominique installation teaches homeowners
A photograph of an outdoor heat pump may seem to show nothing more than a machine mounted against a wall. To us, however, it represents the culmination of several technical decisions.
For this project, we specifically had to consider:
- the unit's height above the ground;
- the proximity of electrical equipment;
- clearance in the side passage;
- mechanical fastening to wall brackets;
- the space in front of the fan;
- the piping route;
- drainage during cooling and defrost cycles;
- the access required for servicing;
- the specific requirements of R-32 A2L;
- the property's actual heating needs.
This work is what turns a simple equipment installation into a truly professional HVAC installation.
The mistakes we seek to avoid
In the heat pump installations we see throughout Greater Montreal and Montérégie, certain mistakes recur regularly.
Installing the unit too close to the ground
A heat pump intended for heating must be designed for winter. Snow accumulating in front of or beneath the unit can become a problem.
Blocking the fan
A fence, storage bin, vegetation, or another appliance placed too close can hinder air discharge.
Neglecting pipe diameters
The piping for an ORION XLTH 12K is not necessarily the same as that for an 18K or 24K.
Choosing solely according to the number of BTUs
The actual heating load, insulation, orientation, and layout of the house matter just as much as its size.
Forgetting about future maintenance
A unit must remain accessible for cleaning, diagnostics, and any potential repairs.
Ignoring winter operation
For a cold-climate heat pump, defrost water drainage, clearance from snow, and performance at below-freezing temperatures must be considered from the outset.
ENERGY STAR and program eligibility: always verify the exact combination
The FUJITSU technical sheet indicates ENERGY STAR ratings, including cold-climate classifications for the models presented.
This may play a role in assessing certain financial assistance programs available in Quebec.
However, it is important not to conclude that a product is automatically eligible for a subsidy simply because it bears the name ORION XLTH. Eligibility must be verified using the exact combination of indoor and outdoor models, along with the criteria of the applicable program at the time of the project.
At AirGreen, we prefer to work with the system's precise specifications rather than with a general promise of a subsidy.
An AirGreen installation in Saint-Dominique that prioritizes long-term logic
This FUJITSU ORION XLTH installation in Saint-Dominique may appear relatively simple at first glance, but its details reveal the essence of our approach.
The outdoor unit is elevated on wall brackets. The connections are neatly grouped together. The front of the heat pump remains unobstructed. The unit uses R-32, features a design adapted to cold climates, and can operate in heating mode down to -26 °C, according to the manufacturer's documentation.
This is exactly the type of project where the final quality depends as much on the installation as on the machine selected.
At AirGreen, we install FUJITSU wall-mounted heat pumps in Saint-Dominique and throughout our service areas: Montreal, Laval, Longueuil, North Shore, and South Shore.
We assess each property according to its specific conditions: available clearance, wall structure, outdoor routing, electrical circuit, indoor location, piping length, required capacity, and intended system use.
A high-performance heat pump is an excellent foundation. A building-appropriate installation is what truly allows you to benefit from it.
How it goes, from the first call to the end
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
And at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
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What people ask us about this kind of work
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).