Installation of a FUJITSU AIRSTAGE ORION XLTH wall-mounted heat pump in Saint-Philippe on Montreal’s South Shore

A FUJITSU ORION XLTH installation designed to withstand Saint-Philippe winters without sacrificing outdoor space

In Saint-Philippe, on Montreal’s South Shore, we completed an installation that perfectly illustrates what we at AirGreen look for when a homeowner wants to replace or add a heating and cooling system: a high-performance wall-mounted heat pump for cold climates, a well-positioned outdoor unit, and a clean installation that respects the building’s actual constraints.

For this project, we chose a FUJITSU AIRSTAGE ORION XLTH, an H-series wall-mounted heat pump designed to operate in heating mode down to -26 °C. Fujitsu’s technical documentation also indicates an air-conditioning operating range of up to 50 °C, the use of R-32 refrigerant, Inverter technology, and ENERGY STAR certification depending on the configurations in this range.

But the distinctive feature of this installation is not limited to the unit itself. The site photo shows a relatively confined outdoor environment: a brick wall, concrete foundation, existing mechanical equipment nearby, pre-existing piping, and limited space between several building elements. It is precisely in this type of situation that the quality of the HVAC installation becomes just as important as the choice of heat pump.

A compact outdoor location that required careful planning

At this Saint-Philippe property, the outdoor unit of the FUJITSU ORION XLTH was installed directly against the foundation on metal wall brackets, rather than being placed at ground level.

This choice offers several practical advantages.

First, the unit remains elevated above the ground. For a heat pump used for heating during Quebec winters, this detail is important. Snow, ice, and water accumulation around the outdoor unit can interfere with the operation of a poorly positioned system. Installing it on supports provides more clearance beneath the unit and facilitates the drainage of water produced during defrost cycles.

Second, this configuration preserves the space available around the foundation. In the case shown here, several elements were already present in this area: another mechanical unit is located nearby, along with electrical conduits and various penetrations through the building. We therefore had to integrate the new heat pump without turning this technical space into a tangle of piping that would be difficult to maintain.

Third, the wall mount creates a more structured-looking installation. In the photo, the FUJITSU unit is aligned against the foundation, and the refrigerant lines are routed toward a vertical protective line set cover, which helps protect and group the piping.

Why clearance around a heat pump is essential

Installing an outdoor heat pump is never simply a matter of finding a large enough open surface.

An outdoor unit must be able to draw in and discharge a significant volume of air. If it is enclosed between walls, equipment, or obstacles that are too close, the discharged hot or cold air may be drawn back into the unit. This can reduce system performance and make operation more difficult during periods of high demand.

In this installation in Saint-Philippe, the positioning of the FUJITSU heat pump takes into account the wall configuration, the neighboring unit, and the clear area in front of the fan.

This is something we systematically verify during our installations of wall-mounted heat pumps in Montreal, Laval, Longueuil, the North Shore, and the South Shore: clearances must not merely be acceptable on the day of installation. They must also remain functional when snow accumulates, when a technician needs access to the unit, or when the system is operating at full capacity.

A heat pump designed for heating in cold climates

The AIRSTAGE ORION XLTH series stands out primarily for its low-temperature heating capabilities.

According to the Fujitsu technical data sheet provided for this range, the 09KZAH1, 12KZAH1, 15KZAH1, 18KZAH1, and 24KZAH1 models can operate in heating mode between -26 °C and 24 °C. The documentation also presents a base pan heater, which is particularly relevant in regions where the system must operate for extended periods below freezing.

For a property in Saint-Philippe, where winter temperatures can fall well below freezing, this characteristic is much more relevant than simply having high cooling efficiency in summer.

A heat pump used in Quebec must be selected by taking several parameters into account:

• the actual heating capacity when the outdoor temperature drops;
• the property’s size and insulation;
• the layout of the rooms;
• the location of the indoor unit;
• the building’s heat loss;
• whether or not auxiliary heating is available;
• available electrical capacity;
• and how the occupants use their system.

The rated capacity listed on a heat pump is therefore only part of the equation.

Performance varies according to the selected capacity

The FUJITSU ORION XLTH family covered by the documentation includes several capacities. Since the rating plate is not visible in the photo of this installation, we cannot determine with certainty which capacity is installed based on the image alone.

The Fujitsu lineup presented includes, among others:

These figures show why it is important not to select a heat pump solely on the basis of the BTU rating shown in an advertisement. Two units with different capacities can have very different performance, modulation, and low-temperature heating characteristics.

Inverter technology: better suited to temperature fluctuations

The FUJITSU ORION XLTH uses an inverter compressor. Unlike a conventional system that operates primarily on an on-off basis, an inverter can adjust its output according to demand.

When a home approaches its setpoint temperature, the heat pump can reduce its output rather than shutting down completely and restarting shortly afterward.

This makes it possible to:

• more stable indoor temperatures;
• fewer significant comfort fluctuations;
• better efficiency during periods of moderate demand;
• generally quieter operation;
• a gradual adjustment to changes in outdoor temperature.

Fujitsu also indicates very broad capacity ranges for this series. The 12K model, for example, can modulate between 3,100 and 16,000 BTU/h in cooling mode, while its stated heating range is 3,500 to 23,600 BTU/h.

This ability to modulate is particularly useful during the shoulder seasons in Saint-Philippe, when a few thousand BTUs are enough to maintain comfort without requiring the compressor to operate at full capacity.

R-32: the refrigerant used by this new generation of FUJITSU

Another important element of this installation is clearly visible directly on the outdoor unit: the label R32.

The ORION XLTH series does indeed use R-32 refrigerant.

According to Fujitsu documentation, its global warming potential is 675, compared with 2,088 for R-410A, representing a stated reduction of 68% in GWP. Fujitsu also indicates that systems using R-32 require less refrigerant while maintaining the heating performance sought.

For us at AirGreen, this also means that installation practices must precisely follow the requirements specific to modern equipment using this type of refrigerant: line preparation, connections, testing, evacuation, and commissioning must all be performed correctly.

What this Saint-Philippe installation shows about the quality of truly professional HVAC work

A good wall-mounted heat pump installation is often more noticeable in the details than in the unit itself.

Protected piping instead of exposed piping

To the left of the outdoor unit visible in the photo, the connections run upward through a vertical line set cover attached to the building.

This finish serves several purposes. It protects the refrigerant lines and wiring, reduces their exposure to the elements, and gives the exterior wall a much cleaner appearance.

We place a great deal of importance on this point because an installation remains on a property for many years. A few minutes saved by leaving poorly organized lines can result in a visually substandard installation that is more vulnerable to damage.

Pipe sizes are not identical for all models

This is a common mistake when replacing a heat pump: assuming that the existing lines can automatically be reused because the new unit has a similar capacity.

The documentation for the FUJITSU ORION XLTH clearly shows why this assumption can be problematic.

The recommended dimensions vary by model:

• 09K and 12K: 1/4 in. liquid and 3/8 in. gas;
• 15K: 1/4 in. liquid and 1/2 in. gas;
• 18K and 24K: 3/8 in. liquid and 5/8 in. gas.

The maximum allowable lengths also vary: up to 25 m for the 09K and 12K models, 30 m for the 15K, and 50 m for the 18K and 24K models, according to the technical data sheet.

Before reusing existing piping, we must therefore confirm the diameter, condition, refrigerant compatibility, and the limits established by the manufacturer.

Special attention to the electrical supply

The heat pump’s capacity also affects the required electrical circuit.

The 09K and 12K models in this range are specified with a 15 A circuit breaker, while the 15K, 18K, and 24K models are specified with a 20 A circuit breaker, on a 208 to 230 V, 60 Hz, single-phase power supply.

That is why we always inspect the electrical installation before considering a replacement “simple.”

The fact that an older heat pump operated on an existing circuit does not automatically mean that a new system can be connected to the same circuit.

Exceptionally quiet indoor operation

Acoustic comfort is an important consideration for a wall-mounted heat pump, especially when the indoor unit is located in a living room, bedroom, or open-concept area.

Depending on the model, the ORION XLTH series can operate at an indoor sound level as low as 23 dB(A) in quiet mode for the 9,000 and 12,000 BTU versions. The 15K model reaches 26 dB(A), while the 18K and 24K models are rated at 30 dB(A) in quiet mode.

The backlit remote control is included with the indoor unit, and Fujitsu provides several fan speeds and different operating modes, including energy saving, minimum heat, automatic defrost, and automatic restart.

Built-in Wi-Fi simplifies daily control

The documentation for this series also indicates built-in Wi-Fi connectivity, allowing remote monitoring and control using the AIRSTAGE app.

For a homeowner, this feature becomes particularly convenient when they want to adjust the temperature before returning home, monitor system operation, or change the settings without being in front of the wall-mounted unit.

An installation that must remain accessible for maintenance

On a project in Saint-Philippe, we must think not only about the day the heat pump is installed, but also about future service work.

The outdoor unit’s service panels must remain accessible. It must be possible to clean the heat exchanger, perform electrical checks, and work on the refrigerant circuit without having to dismantle part of the building.

This approach explains why we do not simply try to “hide” a heat pump in the tightest possible space.

The optimal location is the one that balances:

performance, clearance, protection from snow, accessibility, piping length, noise level, and exterior appearance.

The mistakes we seek to avoid when installing a heat pump

Over the course of our heat pump installations in Montréal, Laval, Longueuil, the North Shore, and the South Shore, certain errors come up regularly when we inspect existing installations.

Among the most important:

1. installing the outdoor unit too close to the ground;
2. blocking airflow in front of the condenser;
3. placing several units too close to one another;
4. using piping with an unsuitable diameter;
5. leaving the refrigerant lines insufficiently protected;
6. choosing the capacity solely based on the building’s area;
7. neglecting low-temperature heating requirements;
8. overlooking the accessibility required for maintenance;
9. installing a heat pump without taking snow and defrost cycles into account;
10. assuming that an old electrical circuit is automatically suitable for the new unit.

These are precisely the details that distinguish an installation that “works” at startup from a HVAC installation designed to operate properly for years.

Why the FUJITSU ORION XLTH is particularly well suited to the South Shore climate

In a city like Saint-Philippe, a homeowner may experience hot, humid summer days, followed a few months later by periods of intense cold.

The same system must therefore be able to handle two very different realities.

The FUJITSU AIRSTAGE ORION XLTH offers:

• heating and cooling with a single system;
• heating operation down to -26 °C;
• Inverter technology;
• ENERGY STAR certification according to the models presented;
• R-32 refrigerant;
• integrated Wi-Fi;
• standard base pan heater for cold climates;
• quiet indoor operation;
• several features allowing the system to be adapted to the building;
• indoor coils with corrosion-resistant ProCore copper, according to Fujitsu documentation.

Fujitsu also indicates that certain configurations in the range can maintain significant maximum heating capacity at very low temperatures. For example, depending on capacity, the technical table shows percentages of maximum heating capacity still available at -21 °C and -26 °C. This data is much more revealing for a Quebec homeowner than a simple summer cooling rating.

Our approach at AirGreen: choose the machine, but above all, get the installation right

We install heat pumps in very different buildings: detached houses, duplexes, condos, older properties, newer constructions, and buildings where multiple mechanical systems must share limited space.

The installation photographed in Saint-Philippe is a good example of this reality.

We had a foundation wall available, but there were also several physical constraints around the installation area. The solution was to properly integrate the FUJITSU AIRSTAGE ORION XLTH unit, keep it elevated with wall brackets, and organize the connections coherently along the building.

For the homeowner, the final result is not just a new heat pump. It is a heating and air conditioning system designed to become a permanent part of the building, with an installation that allows for daily use, maintenance, and operation throughout the winter.

Planning a FUJITSU installation in Saint-Philippe or elsewhere in Greater Montreal?

Before choosing a capacity or comparing only the prices of several heat pumps, we recommend looking at the project as a whole: outdoor unit placement, indoor layout, heating needs, electrical supply, piping, noise level, low-temperature performance, and installation quality.

At AirGreen, we install FUJITSU ductless heat pumps in Saint-Philippe, Montreal, Laval, Longueuil, on the South Shore, and on the North Shore.

The machine obviously plays a major role. But as this FUJITSU ORION XLTH installation shows, positioning, clearances, the finish of the lines, and compliance with the manufacturer’s specifications are just as important for achieving a reliable, high-performance HVAC system suited to Quebec conditions.