Installation of a Fujitsu AIRSTAGE Altair 500 R-32 wall-mounted heat pump in Otterburn Park, in Montérégie on the South Shore.

In Otterburn Park, an outdoor installation that shows why the heat pump’s support matters just as much as the machine

In this installation carried out in Otterburn Park, what immediately draws attention is not only the Fujitsu AIRSTAGE logo or the R32 identification clearly visible on the outdoor unit. It is above all the way the unit was installed: raised on a sturdy metal support, above the concrete surface, rather than simply placed at ground level.

In Quebec, this detail is far from secondary.

A wall-mounted heat pump must withstand snow, freezing temperatures, thaw periods, condensation water produced during heating cycles, and possible ice buildup around the outdoor unit. In Otterburn Park, as elsewhere on the South Shore, we must therefore plan the outdoor installation with the same precision as choosing the capacity or positioning the indoor wall-mounted unit.

For this project, we installed a Fujitsu AIRSTAGE Altair 500, a single-zone heat pump from the H series operating with R-32 refrigerant. Fujitsu documentation presents the Altair 500 in several capacities, from 9,000 to 36,000 nominal BTU, with Inverter technology, heating and cooling operation, and different ENERGY STAR ratings depending on the model selected.

A raised support to keep the outdoor unit away from ground-level conditions

The photo of this installation clearly shows the metal support installed beneath the compressor.

The outdoor unit rests on two support points equipped with fastening elements, themselves supported by a raised metal structure. This setup provides clearance beneath the heat pump and prevents the bottom of the appliance from being in direct contact with the concrete.

For a heat pump installation in Otterburn Park, this configuration offers several practical advantages:

• it keeps the outdoor unit above the immediate ground surface;
• it creates useful clearance for water drainage;
• it facilitates access around the machine’s base;
• it reduces the risk of small accumulations of snow or ice reaching the underside of the unit directly;
• it allows for a more structured installation than an appliance simply placed on a surface without a dedicated support;

In heating mode, a heat pump must periodically perform defrost cycles. The water produced must be able to drain properly around the outdoor unit. That is why the area beneath the machine is an integral part of our HVAC installation work.

A tight space next to the building that requires precise planning

In the photo, the Fujitsu unit is installed very close to the home’s exterior wall and near a masonry section.

This type of configuration is common on the South Shore, especially when homeowners want to preserve their yard, patio, or side walkways. However, placing a unit in a compact space requires careful planning.

We must consider several aspects:

• clearance for air circulation;
• access to the connections;
• future access for heat pump maintenance;
• the necessary clearance around the fan;
• support stability;
• condensate management;
• refrigerant line routing;
• positioned so as not to create unnecessary disturbance around the building.

The goal is never simply to find a place where the compressor “fits.” The unit must be able to operate and be serviced properly for several years.

A Fujitsu AIRSTAGE outdoor unit clearly identified as R-32

The photo clearly shows the marking R32 on the front of the outdoor unit.

This is an important detail of this Fujitsu Altair 500 generation. According to the manufacturer’s brochure, Fujitsu uses R-32 with a stated global warming potential of 675, compared with 2,088 for R-410A, representing a 68% reduction according to the data presented by Fujitsu.

The manufacturer also indicates that its R-32 systems use less refrigerant while maintaining the desired heating performance.

In our Otterburn Park photo, a warning about the risk of fire and flammable refrigerant can also be seen on top of the unit, along with instructions stating that the work must be carried out by qualified personnel in accordance with applicable regulations.

For us, this highlights an important reality: with new generations of HVAC systems, installation quality depends not only on general refrigeration experience, but also on strict compliance with the manufacturer's requirements and the procedures specific to the refrigerant used.

The Altair 500: several capacities, one Fujitsu AIRSTAGE platform

The technical documentation for the Fujitsu AIRSTAGE Altair 500 includes six families:

• 09KPAS1;
• 12KPAS1;
• 18KPAS1;
• 24KPAS1;
• 30KPAS1;
• 36KPAS1.

The nominal cooling capacities indicated by Fujitsu are 9,000, 12,000, 18,000, 22,000, 30,000, and 33,000 BTU/h, respectively. The nominal heating capacities are 10,000, 14,000, 18,000, 24,000, 30,000, and 34,000 BTU/h.

The photo clearly shows the outdoor unit, but the label containing the exact model number is not legible. We therefore cannot reliably assign a specific capacity to this installation based solely on the unit's visible dimensions.

That is precisely a practice we avoid at AirGreen.

To select a wall-mounted heat pump in Otterburn Park, we instead assess the residence's actual heating and cooling needs: floor area, room layout, insulation, windows, exposure, floor served, and natural air circulation.

Efficiency ratings that vary according to the selected capacity

Another reason to know the exact reference is that the Altair 500's performance is not identical across capacities.

The Fujitsu data sheet lists, among other things, TRE2 values ranging from 21.0 to 26.0 BTU/hW depending on the model. The 09KPAS1 is listed at 26.0, the 12KPAS1 at 24.0, the 18KPAS1 at 22.0, and the 24KPAS1 at 21.5.

The CPSC2, TRE2, and CP2 values also vary according to capacity.

For a homeowner comparing several Fujitsu heat pumps, this information is useful, but it must be interpreted correctly. A high efficiency rating never replaces proper sizing.

An oversized heat pump or one installed in the wrong area may operate less comfortably than a model better suited to the building.

Heating down to -15 °C for the Altair 500 series

The series documentation indicates a heating operating range of -15 °C to 24 °C for all six Altair 500 capacities.

For a residence in Otterburn Park, this information must be considered in the context of the overall heating strategy.

The Altair 500 can provide heating during a significant part of the cold season, but it should not be confused with other Fujitsu series specifically designed to operate as very-low-temperature solutions.

When preparing a project, we therefore determine whether the heat pump will be used as the primary heating source within its operating range, as a supplementary system, or as a solution intended mainly for cooling and heating during milder periods.

This distinction avoids comparing only brands or BTUs without considering the machine’s actual role in the home.

Inverter technology: capacity that adapts to demand

The Altair 500 series uses an Inverter compressor.

The principle is particularly relevant in a residential installation: instead of operating only at full capacity and then shutting down completely, the heat pump can adjust its performance according to demand.

This helps maintain a more consistent temperature and reduce noticeable fluctuations in the home.

Fujitsu also highlights several features of its Altair 500 platform, including:

• energy-saving mode;
• minimum heat;
• automatic defrosting;
• automatic restart;
• multiple fan speeds;
• additional control options;
• Wi-Fi connectivity with a compatible adapter.

Indoor operation as low as 19 dB(A)

Although the photo of this installation in Otterburn Park mainly highlights the outdoor unit, the indoor unit’s sound level remains an important consideration for homeowners.

According to Fujitsu, the 09KPAS1 and 12KPAS1 models can operate at 19 dB(A) in cooling mode on the quiet setting. For the higher capacities, Fujitsu specifies 26, 31, and 32 dB(A), respectively, depending on the model.

The outdoor unit also has varying sound levels depending on its capacity, ranging from 46 dB(A) to higher values depending on the model and operating mode.

The location where we place the compressor is therefore important. An excellent unit can become more noticeable if it is positioned in an area where sounds are reflected by several nearby surfaces.

The technical details behind a durable Fujitsu installation in Otterburn Park

The outdoor support: a small visible part of a much larger job

Once the heat pump has been installed, the homeowner mainly sees three things: the indoor unit, the outdoor compressor and the line-set covers.

For us, a large part of the work is nevertheless invisible.

Before start-up, the Fujitsu heat pump installation requires, among other things, proper management of:

1. mechanical assembly;
2. the refrigerant connections;
3. the electrical power supply;
4. the communication cable;
5. drainage;
6. evacuation;
7. leak checks;
8. commissioning and performance testing.

The support visible in the photo is therefore part of a much broader system.

Its stability is important because an outdoor unit contains a moving compressor and fan. The unit must remain properly secured and stable, without unnecessary vibration being transferred to the structure.

A visible drain: a detail to monitor year-round

To the left of the outdoor unit, the photo also shows a flexible drainage hose extending down toward the ground.

This type of detail must be managed so that water can drain away without causing problems around the building.

Water is an often-underestimated factor in a heat pump installation. In cooling mode, the indoor unit removes moisture from the air. In heating mode, the outdoor unit can generate water during its defrost cycles.

In Otterburn Park, where temperatures frequently rise above and fall below the freezing point during the winter, water management must be planned from the time of installation.

Different copper diameters depending on the Altair 500 model

The Fujitsu technical specifications confirm that the piping does not have the same diameter for all capacities.

For the Altair 500 series:

• 09KPAS1 and 12KPAS1: 1/4 in. liquid and 3/8 in. gas;
• 18KPAS1 and 24KPAS1: 1/4 in. liquid and 1/2 in. gas;
• 30KPAS1 and 36KPAS1: 3/8 in. liquid and 5/8 in. gas.

This information becomes particularly important when replacing an older heat pump.

In Montreal, Laval, Longueuil, the North Shore, and the South Shore, we regularly meet homeowners who want to keep their existing lines to limit the work required. This option can only be approved after verifying exact compatibility with the new equipment.

Reusing lines simply because they are already in place is not a good approach.

Up to 164 feet of piping on certain capacities

The Altair 500’s installation flexibility also varies by model.

Fujitsu specifies a maximum piping length of:

• 20 m / 66 ft on the 09 and 12 models;
• 30 m / 98 ft on the 18 and 24 models;
• 50 m / 164 ft on the 30 and 36 models.

This can make it possible to place the outdoor unit in a more practical area around the home when mounting it directly behind the indoor unit is not possible.

In Otterburn Park, the photographed outdoor unit is installed against the building on a solid surface, allowing for compact integration without unnecessarily occupying a large portion of the outdoor space.

Electrical requirements also vary by BTU capacity

The Altair 500 series operates at 208–230 V, 60 Hz, single-phase.

However, the breaker specified by Fujitsu varies depending on capacity:

• 15 A for the 9,000, 12,000, and 18,000 BTU models;
• 20 A for the 24KPAS1 model;
• 30 A for the 30KPAS1 and 36KPAS1 models.

At AirGreen, we always base our recommendations on the precise requirements of the selected unit. An older electrical circuit should not automatically be considered compatible with a new heat pump simply because the two systems appear to be a similar size.

Features also designed with maintenance in mind

Fujitsu documentation indicates that the Altair 500’s indoor unit uses washable filters, copper ProCore coils, and a heat exchanger with Hydro Fin-coated fins designed to improve corrosion resistance.

These features are valuable, but they do not replace maintenance.

To maintain good airflow and limit dust buildup, we recommend checking the filters regularly. Over time, a thorough wall-mounted heat pump cleaning may also become necessary to clean the heat exchanger, blower wheel, condensate pan, and other internal components exposed to the air in the home.

HVAC maintenance is always simpler when it has been taken into consideration from the initial equipment placement.

ENERGY STAR and rebates: verify the exact combination before promising an amount

The Altair 500 series technical sheet lists different ENERGY STAR classifications depending on the model, including classifications associated with cold climates for certain capacities.

When a homeowner is looking for a heat pump rebate in Quebec, we nevertheless verify the exact combination of the indoor and outdoor units, along with the criteria of the applicable program.

The trade name “Fujitsu Altair 500” alone is not enough to determine a rebate amount.

This verification must be carried out using the exact model numbers and the criteria applicable at the time of the project.

What we take away from this Otterburn Park installation

The photo of this Fujitsu AIRSTAGE Altair 500 R-32 perfectly illustrates a part of our work that homeowners rarely see when shopping for a heat pump online.

Performance tables refer to BTUs, SEER2, and energy consumption. The brochure refers to Inverter technology, quiet operation, and R-32 refrigerant.

On site, we must turn all these characteristics into a concrete installation.

In Otterburn Park, this notably means:

• find a suitable outdoor location;
• create a stable, elevated support;
• plan for water drainage;
• maintain functional access to the unit;
• make the connections according to Fujitsu specifications;
• take the building’s proximity into account;
• ensure a clean exterior finish.

It is precisely this combination of equipment selection and installation quality that influences the long-term result.

At AirGreen, we install Fujitsu wall-mounted heat pumps in Otterburn Park, Mont-Saint-Hilaire, Beloeil, Saint-Hyacinthe, Longueuil, and throughout the South Shore, as well as in Montreal, Laval, and on the North Shore.

Each property has its own constraints. Our job is to select and install the system accordingly, rather than replicate the same configuration from one home to another.