Installation of a FUJITSU ORION XLTH+ wall-mounted heat pump in Saint-Mathias-sur-Richelieu: precise integration on a brick wall for heating down to -30 °C

A FUJITSU ORION XLTH+ installed to the millimeter between a brick wall, a ceiling, and a side wall

Some wall-mounted heat pump installations stand out less because of the length of the piping or the size of the equipment than because of the precision required to properly integrate the indoor unit into the existing architecture. This installation completed by our AirGreen team in Saint-Mathias-sur-Richelieu, in Montérégie, is an excellent example.

The choice was a FUJITSU AIRSTAGE ORION XLTH+, a single-zone wall-mounted heat pump developed for heating in cold climates. In the photo of our installation, the detail that immediately draws attention is its placement: the indoor unit was positioned very high on an exposed brick wall, practically at the junction of the ceiling and the adjacent wall.

The available space was therefore clearly defined. We had to install the unit high enough to preserve the wall’s architectural appearance while respecting the requirements for operation, airflow, and future maintenance.

The result is especially striking: despite the contrast between the white heat pump and the red and brown tones of the brick, the unit blends naturally into the upper part of the room. It does not visually cut across the wall and keeps the entire living space unobstructed.

This installation clearly reflects our philosophy at AirGreen: a proper HVAC installation is not simply a matter of mounting a unit on the wall. Every decision regarding the location, height, piping route, and airflow direction affects occupant comfort and the quality of the long-term result.

Why the FUJITSU ORION XLTH+ Is Particularly Well Suited to Saint-Mathias-sur-Richelieu’s Climate

In Saint-Mathias-sur-Richelieu, as in several areas of the South Shore, the choice of a heat pump must take winter temperatures into account, not just cooling needs during the summer.

The FUJITSU ORION XLTH+ series is designed to operate in heating mode down to -30 °C (-22 °F). Fujitsu offers three configurations in this series: 09KTAP1, 12KTAP1, and 15KTAP1. Depending on the capacity selected, the nominal cooling capacity is 9,000, 12,000, or 14,500 BTU/h, while the nominal heating capacity reaches 12,000, 15,300, and 17,400 BTU/h, respectively.

We cannot confirm the exact capacity of the installed unit from the photo alone. This is an important point: a wall-mounted unit should never be identified by BTU based solely on its appearance, especially when several capacities use a very similar indoor casing.

At AirGreen, capacity should instead be selected according to the building’s actual heating requirements.

Heating capacity that remains relevant even when the mercury drops

One of the most interesting technical aspects of this range is its ability to maintain its capacity when the outdoor temperature becomes very low.

According to Fujitsu documentation, at -30 °C, the maximum heating capacity still represents:

• 113 % of the rated capacity for the 09KTAP1 model;
• 103 % for the 12KTAP1 model;
• 101 % for the 15KTAP1 model.

At -26 °C, the values indicated are 147%, 128%, and 116%, respectively.

This information is particularly important when a homeowner compares different cold-climate heat pumps. It is not enough for a manufacturer to indicate a minimum operating temperature. We also look at the amount of heat the unit can provide at those temperatures.

For a residence in Saint-Mathias-sur-Richelieu, this low-temperature performance can make an important difference in the winter heating strategy.

A brick installation that requires more preparation

The photo of this installation highlights an architectural feature that directly influences our work: the exposed brick wall.

Installing an indoor unit on this type of surface requires a different method from a simple installation on a drywall wall.

The mounting must be solid and perfectly level

The indoor unit’s rear mounting bracket must be securely anchored. Brick and mortar joints do not all have the same strength, and selecting the mounting points is important.

Improper mounting could notably create:

• vibrations;
• slight movement of the unit over time;
• an incorrect slope in the drainage pan;
• unwanted noises;
• a visible alignment issue on a wall where the brick lines naturally serve as a visual reference.

On a wall like this, an offset of a few millimetres can become much more noticeable than on a uniform surface.

A very high position that preserves the character of the wall

The brick wall is an important architectural feature of this room. Installing the FUJITSU heat pump lower down would have occupied a much more visible portion of this surface.

We therefore opted for a high installation, close to the ceiling and the corner of the wall.

This choice offers several advantages when the building’s layout allows it:

• the lower wall space remains available;
• the unit remains out of traffic areas;
• furniture can be arranged more freely;
• the airflow can be directed into the room;
• the equipment’s visual impact is reduced.

However, the right balance must be found. A unit installed too close to the ceiling without considering the necessary clearances could complicate its operation or maintenance.

Positioning precision is therefore an integral part of the work.

Access for maintenance should never be overlooked

A wall-mounted heat pump installation must be planned for several years of use.

The air filters on the FUJITSU ORION XLTH+ are washable. The front panel must therefore be able to open for regular maintenance. Fujitsu’s documentation also indicates a compact indoor unit measuring 894 mm wide, 295 mm high, and 280 mm deep for the capacities presented.

When we install a unit near the ceiling, as in this Saint-Mathias-sur-Richelieu project, we immediately consider future service needs:

• filter cleaning;
• evaporator inspection;
• fan cleaning;
• access to the condensate pan;
• drain inspection;
• electrical diagnostics;
• potential thorough HVAC maintenance.

A unit should not only look attractive when the installation is complete. It must remain accessible to technicians several years later.

An indoor unit designed to be acoustically discreet

Sound level is another important criterion for a unit installed in a living space.

According to Fujitsu’s technical specifications, the 09KTAP1 and 12KTAP1 models can operate as quietly as 23 dB(A) indoors. The 15KTAP1 model is rated at 26 dB(A) in the same setting.

The series offers several fan speeds as well as an automatic mode, allowing the unit to further adapt its operation to the room’s needs.

This is especially appreciated when the heat pump is installed in a living room, family room, bedroom, or open-concept area where mechanical noise quickly becomes noticeable.

Inverter technology and capacity modulation

The FUJITSU ORION XLTH+ uses an inverter compressor. Rather than always operating at full capacity and then stopping, the system can adjust its output according to demand.

Let’s take the 12KTAP1 configuration as an example. Its cooling capacity can range from approximately 3,100 to 17,300 BTU/h, while its heating range can extend from 4,500 to 27,300 BTU/h depending on the conditions.

This modulation helps maintain a more stable temperature, particularly when the heating load is low.

It also explains why we avoid oversizing.

Installing more BTUs is not automatically an improvement

A heat pump that is too large for the building’s actual needs is not necessarily more comfortable.

The capacity choice must take factors such as these into account:

• the actual area served;
• the layout of the rooms;
• the quality of the insulation;
• the windows and their orientation;
• solar exposure;
• air infiltration;
• the ceiling height;
• the intended location for the unit;
• the other heating systems present.

A 15,000 BTU heat pump is therefore not automatically preferable to a 12,000 BTU model simply because its maximum capacity is higher.

R-32 refrigerant: FUJITSU’s next generation

The ORION XLTH+ series uses R-32.

In its documentation, Fujitsu states a global warming potential of 675 for this refrigerant, compared with 2,088 for R-410A, representing an announced reduction of 68% in GWP.

However, this development does not change one fundamental fact: the quality of the refrigeration installation remains essential.

The circuit must be installed and commissioned correctly to ensure the heat pump’s reliability.

1/4 in–3/8 in piping across the entire range presented

The technical documentation specifies refrigerant piping of:

Liquid: 1/4 in
Gas: 3/8 in

for the three capacities 09KTAP1, 12KTAP1, and 15KTAP1.

The announced minimum length is 10 ft, while the maximum length can reach 66 ft, with a maximum vertical difference of 49 ft.

These values provide considerable flexibility when the best indoor location is not directly adjacent to the available location for the outdoor unit.

For an installation like the one shown on the brick wall in Saint-Mathias-sur-Richelieu, this flexibility makes it easier to find a compromise between performance, interior aesthetics, and outdoor placement.

A heat pump designed for winter defrost cycles

The FUJITSU ORION XLTH+ also features a base pan heater designed for cold climates.

This is a relevant consideration in Quebec.

When a heat pump heats in winter, moisture can turn into frost on the outdoor heat exchanger. The system then periodically performs a defrost cycle. The resulting water must be able to drain properly.

That is why the outdoor unit’s installation matters just as much as the indoor unit’s: height above the ground, clearance beneath the machine, snow accumulation, and airflow must all be assessed.

What this Saint-Mathias-sur-Richelieu installation concretely demonstrates about the AirGreen method

The unit’s location is chosen based on the room, not merely on ease of installation

The most interesting detail of this installation is probably the location itself.

We could have looked for a large, perfectly uniform surface. Here, the room’s architecture instead provided a precise area at the top of the brick wall, near a side wall and the ceiling.

We used this space in a way that preserved the appearance of the wall while installing the heat pump in a position that was appropriate for comfort.

This way of working is important to us, whether the project is in Saint-Mathias-sur-Richelieu, Longueuil, Montréal, Laval, on the South Shore, or on the North Shore.

A residential installation is an integral part of the home. It should therefore be treated as such.

Airflow is particularly important when the unit is located in a corner

A heat pump installed near a side wall should be oriented so that it does not unnecessarily concentrate the air in a small area.

The ORION XLTH+ series has automatic vertical direction and manually adjustable horizontal orientation, according to Fujitsu documentation.

After installation, adjusting the louvers makes it possible to direct the airflow toward the area that is actually occupied.

The goal is not simply to achieve the correct temperature directly beneath the unit. We seek to distribute the air as evenly as possible throughout the space being served.

Drainage deserves the same attention as the refrigerant piping

A wall-mounted unit produces condensation during cooling and dehumidification.

The drain must therefore be installed carefully. An improper slope or problematic routing could eventually cause water to accumulate, a leak, or unwanted noise.

On a project carried out on an architectural brick wall, preventing this type of problem is especially important: a leak could damage the surfaces and create a much more complex repair than a simple fix on a drywall wall.

We therefore pay particular attention to drainage even before permanently securing the unit.

The mistakes we seek to avoid on this type of project

A beautiful heat pump and a good technical data sheet are not enough. The final quality depends enormously on the installation.

Among the problems we systematically work to prevent:

1. An improperly sized unit, selected simply according to the number of square feet.
2. A unit installed too close to an obstruction, restricting air intake or discharge.
3. An unlevel unit, particularly noticeable on a brick wall.
4. Insufficient or unnecessarily complex drainage.
5. A mounting method unsuitable for the wall material.
6. A location that prevents future maintenance.
7. Incorrect positioning of the outdoor unit in relation to snow.
8. A capacity choice based solely on air conditioning, without considering winter performance.

ENERGY STAR and financial assistance programs: always verify the exact combination

The documentation provided for the ORION XLTH+ indicates ENERGY STAR ratings, including the designations associated with cold-climate equipment for the configurations presented.

For any grant or financial assistance application, however, we recommend verifying the exact combination of indoor and outdoor model numbers, as well as the rules in effect at the time of purchase.

Programs may require a specific certified combination, and their criteria may change. We therefore prefer to confirm the eligibility of a specific system rather than assume that an entire product line automatically qualifies for financial assistance.

A project that represents what we strive for at AirGreen

This FUJITSU ORION XLTH+ installation in Saint-Mathias-sur-Richelieu is a good example of a project where technical and aesthetic considerations must move forward together.

The brick wall gave the room a very distinctive character. The space between the ceiling and the adjacent wall was limited. Despite this, the indoor unit was integrated discreetly and coherently, without sacrificing the necessary access or turning the heat pump into the room’s dominant feature.

The ORION XLTH+ also offers these technical features: heating down to -30 °C, Inverter technology, R-32 refrigerant, very quiet indoor operation depending on capacity, built-in Wi-Fi, ProCore coils, and a base pan heater for cold conditions.

At AirGreen, we carry out this type of wall-mounted heat pump installation throughout Greater Montreal, particularly in Montreal, Laval, Longueuil, the North Shore, and the South Shore. However, every home has its own constraints. The best solution combines proper sizing, equipment suited to Quebec’s climate, and an installation adapted to the actual space.