Installation of a Fujitsu AIRSTAGE Orion XLTH wall-mounted heat pump in Outremont, Montreal

A compact outdoor installation in Outremont where every available centimetre had to be used intelligently

In Outremont, wall-mounted heat pump installations often involve a different reality from that of a house on a large, open lot. Outdoor spaces may be tighter, balconies narrower, façades closer to passage boundaries, and options for positioning the outdoor unit much more limited. That is exactly what makes this installation of a Fujitsu AIRSTAGE Orion XLTH wall-mounted heat pump particularly interesting.

In the job-site photo, the Fujitsu outdoor unit was installed on a raised metal structure, directly on an outdoor surface near a window, a masonry wall, and a railing. The configuration required a compact installation without simply placing the unit on the ground.

We therefore worked with the available space so that the unit would remain stable, accessible, and clear of the ground, while maintaining a clean installation in this residential environment in Outremont, Montreal.

A detail immediately visible on the unit also confirms the new generation of the range: the R32 label is clearly displayed on the front panel of the outdoor unit. This refrigerant choice is one of the important technical features of the Fujitsu AIRSTAGE Orion XLTH series.

Why did we raise the outdoor unit?

The metal support visible beneath the heat pump is not merely an aesthetic accessory.

For an HVAC installation in Montreal, particularly when a heat pump must operate during the winter, the height of the outdoor unit deserves special attention.

A heat pump in heating mode exchanges energy with the outdoor air and periodically performs defrost cycles. Water can then form around the unit. In winter, snow and ice must also be taken into account.

In the Outremont project, the unit is clearly raised above the surface of the balcony or terrace, thanks to a metal support whose four legs rest firmly on the concrete.

This configuration makes it possible, among other things, to:

• keep the underside of the unit farther away from snow and water;
• maintain clearance beneath the unit;
• facilitate drainage from defrost cycles;
• avoid placing the heat pump directly on the slab;
• keep the outdoor installation easier to inspect;
• create a stable base in a relatively confined environment.

We can also see elements placed between the unit and its support, contributing to a cleaner overall installation.

A clearly visible constraint: working between the window, the wall, and the railing

This photo clearly illustrates an aspect of the trade that rarely appears in technical specifications: a good heat pump must also be installed correctly in the actual building.

Here, the space is framed by several architectural elements.

There is a window behind the unit. On the side, we have a façade combining masonry and siding. A black metal railing is also located immediately nearby. The unit therefore had to be positioned methodically to make the most of the available space.

On a project like this, moving the outdoor unit a few inches can affect:

• future accessibility;
• the route of the refrigerant lines;
• the amount of piping required;
• the space available for servicing;
• how air circulates around the condenser;
• ease of maintenance;
• the visual integration of the installation.

That is why we determine the unit’s location before finalizing the openings and the route of the lines.

The Fujitsu AIRSTAGE Orion XLTH: a heat pump designed for heating in cold climates

A series capable of heating operation down to -26 °C

For this installation in Outremont, the choice was the Fujitsu AIRSTAGE Orion XLTH, a single-zone wall-mounted heat pump from the H series.

The Fujitsu documentation provided for this range indicates a heating operating range down to -26 °C, or -15 °F, and a cooling range from -10 °C to 50 °C. The series includes the 09KZAH1, 12KZAH1, 15KZAH1, 18KZAH1, and 24KZAH1 capacities.

This is particularly important for a heat pump installation in Montreal.

When a homeowner compares several wall-mounted systems, it is not enough to look at the number of BTUs listed in the product name. In Quebec, we place great importance on heating performance when temperatures drop below zero.

Fujitsu documentation also presents maximum capacity values at -15 °C, -21 °C, and -26 °C, which helps provide a clearer understanding of how each capacity in the range performs under real winter conditions.

Several capacities available in the Orion XLTH range

The technical data sheet presents five configurations.

At nominal cooling capacity, they correspond to:

• 09KZAH1: 9,000 BTU/h;
• 12KZAH1: 12,000 BTU/h;
• 15KZAH1: 14,500 BTU/h;
• 18KZAH1: 18,000 BTU/h;
• 24KZAH1: 22,000 BTU/h.

At nominal heating capacity, the same range delivers, respectively:

• 12,000 BTU/h;
• 16,000 BTU/h;
• 18,000 BTU/h;
• 21,600 BTU/h;
• 25,200 BTU/h.

The outdoor photograph does not make it possible to confirm with certainty the exact capacity installed at this Outremont site, since several models in the range use an outdoor cabinet of comparable dimensions. We therefore prefer to present the exact data for the Orion XLTH family rather than arbitrarily assigning a BTU rating to the unit shown in the photograph.

Very high efficiencies at lower capacities

The range also offers particularly attractive energy efficiencies.

According to the Fujitsu technical data sheet:

• the 09K displays a TRÈS2 of 33.1;
• the 12K reaches 30,5;
• the 15K displays 27,5;
• the 18K reaches 25,5;
• the 24K displays 24,0.

The units are also identified with the ENERGY STAR, ENERGY STAR Cold Climate, and designations presented by Fujitsu in its technical data sheet.

For an Outremont homeowner looking to reduce energy consumption associated with heating and air conditioning, these figures are an important point of comparison.

However, we always emphasize that a unit that is highly efficient on paper must also be properly sized and properly installed to deliver the expected results.

R-32: clearly identifiable on the installed unit

In our photo of the installation, the small marking R32 is visible directly on the right-hand panel of the outdoor unit.

Fujitsu documentation indicates a global warming potential of 675 for R-32, compared with 2,088 for R-410A in the graph presented by the manufacturer, representing a stated 68% reduction in GWP.

Fujitsu also emphasizes that its R-32 equipment requires less refrigerant while maintaining the heating performance sought for this product range.

For us, using R-32 also means that installation, commissioning, and future service work must be carried out according to procedures appropriate for this refrigerant.

Inverter technology: maintaining comfort with gradual modulation

The Fujitsu Orion XLTH uses an Inverter compressor.

Unlike a unit that operates solely according to an on/off logic at full capacity, Inverter technology can gradually adjust its operation according to the heating or cooling demand.

This modulation helps maintain a more consistent indoor temperature and prevents the unit from systematically operating at maximum capacity when it is not needed.

This is also why proper sizing remains essential.

Installing a much larger heat pump than necessary on the pretext of obtaining “more heating” is not our approach. Instead, we analyze the home’s needs, the layout of the rooms, and the installation conditions.

A compact outdoor unit suited to challenging installations

The Outremont job site clearly illustrates the value of a relatively compact outdoor unit.

The technical sheet indicates that the outdoor unit associated with the 09K, 12K, and 15K models measures approximately:

• 632 mm high;
• 799 mm wide;
• 290 mm deep.

This limited depth is useful when the installation must be carried out on a restricted outdoor surface.

The photo shows this reality clearly: despite the presence of the railing and window, the heat pump remains integrated into a space that would not have allowed just any outdoor configuration to be used.

The base pan heater: an essential detail for our climate

Fujitsu’s documentation also mentions a base pan heater designed for extremely cold climate regions.

This feature takes on its full significance with the elevated mounting shown at our job site.

In winter, when the heat pump enters defrost mode, water may leave the outdoor coil. It is therefore important to consider what will happen beneath the unit when temperatures are well below freezing.

Combining a cold-climate design with thoughtful outdoor placement is far more important than simply installing the unit “wherever there is room.”

Piping varies according to the selected capacity

The Orion XLTH series also illustrates why the exact model specifications must be checked before reusing an old refrigerant line set.

The dimensions specified by Fujitsu are:

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

Thus, two units from the same family may require different lines.

When replacing a wall-mounted heat pump in Montreal, we therefore never assume that the existing lines are automatically compatible with the new unit.

Line lengths offering great flexibility

Depending on capacity, Fujitsu also allows maximum piping lengths ranging from approximately 25 m to 50 m, or 82 to 164 feet.

The maximum permitted vertical differences range from 20 to 30 meters, depending on the model.

This flexibility is useful in Outremont, where the indoor and outdoor units cannot always be positioned exactly back to back.

Multi-story buildings, balconies, masonry walls, or certain architectural constraints may require a more elaborate route.

Our goal, however, remains to keep the route as clean and logical as possible.

A quiet outdoor heat pump for an urban environment

Sound levels become particularly important in a dense residential neighborhood.

Depending on the model, the technical specifications indicate outdoor sound levels of approximately 46 to 49 dB(A) in cooling mode and up to 50 dB(A) in heating mode for certain capacities.

Indoors, operation can be as low as 23 dB(A) in quiet mode on the 09K and 12K models.

This means comfort does not depend solely on temperature. In a living room, bedroom, or office, perceived sound levels quickly become an essential consideration.

Why the metal support is particularly relevant to this project

Let’s return to the most distinctive element of this Outremont installation: the outdoor structure.

Here, we have a unit that could seemingly have simply been placed lower on the slab. Instead, we chose a raised installation.

For a heat pump used for heating in Montréal, this approach offers several practical benefits:

Reducing exposure to ground-level accumulation

The unit remains higher than the outdoor surface, creating additional clearance from snow and water.

Facilitating drainage during defrosting

The underside of the unit remains exposed to air and is not directly blocked against the concrete.

Improving installation stability

The support provides an independent, clearly defined platform for the heat pump.

Facilitating certain service procedures

The technician does not have to work with the unit placed directly on the ground.

Maintaining a compact installation

On this project, the available width was valuable. The structure used essentially follows the unit’s footprint without unnecessarily taking up circulation space.

Details a homeowner should check before a similar installation

For a residence in Outremont, Montréal, Laval, Longueuil, on the North Shore or the South Shore, we recommend checking several factors before choosing a heat pump location.

1. The capacity actually required
   The choice between 9,000, 12,000, 15,000, 18,000, or 24,000 BTU should not be based solely on floor area.
2. Air circulation around the indoor unit
   A wall-mounted unit must be able to distribute air to the spaces that are actually occupied.
3. The outdoor location
   Snow, water, access, servicing, and surrounding obstacles must all be considered.
4. The existing piping
   Its diameter must match the equipment specifications.
5. Condensate drainage
   It must be carefully planned both for indoor cooling and for the outdoor unit’s performance in winter.
6. Future HVAC maintenance
   Both units must remain sufficiently accessible for cleaning, diagnosis, and repairs.

Subsidies and eligibility: why the system’s exact model number matters

Fujitsu documentation classifies the configurations presented in the Orion XLTH lineup as ENERGY STAR and ENERGY STAR cold climate.

This is an important consideration when a homeowner wants to check whether financial assistance may be available.

However, the document provided does not specify a particular subsidy amount for this Outremont installation. Eligibility and the applicable amount must be verified based on the exact combination of indoor and outdoor models, as well as the program rules in effect when the project takes place.

We therefore avoid announcing an amount based solely on the name “Orion XLTH.”

What we take away from this Outremont installation

This installation perfectly demonstrates that a Fujitsu AIRSTAGE Orion XLTH wall-mounted heat pump is about more than its technical performance.

On this project, the installation’s success also depended on how the outdoor unit was integrated into a limited residential space.

We achieved an installation that was:

• compact;
• elevated;
• stable;
• suited to winter use;
• easily identifiable thanks to the Fujitsu AIRSTAGE finish;
• consistent with the physical constraints of the balcony or terrace.

The visible result is simple, but that simplicity comes from precise planning.

For us at AirGreen, a proper HVAC installation must work just as well in January as in July, while remaining clean, accessible, and logical several years after the project is completed.

This is the approach we apply to our wall-mounted heat pump installations in Outremont and Montreal, as well as in Laval, Longueuil, the North Shore, and the South Shore.