A compact installation in Terrasse-Vaudreuil where every centimetre around the indoor unit mattered
In Terrasse-Vaudreuil, we installed a Fujitsu AIRSTAGE Orion XLTH wall-mounted heat pump in a space where integrating the indoor unit required particular attention. The photo of this installation immediately shows what distinguishes the project: the unit was placed very high on the wall, near the ceiling and in close proximity to a side wall.
This type of installation may appear relatively simple once completed. However, when the space around a heat pump is limited, installation precision becomes even more important. The manufacturer’s requirements must be respected, the necessary access for heat pump maintenance must be preserved, adequate movement of the air-distribution louvers must be allowed, and the routing of the refrigerant lines, drainage, and wiring must be properly planned.
In the photo taken after our installation, we can also see several details specific to this generation of Fujitsu AIRSTAGE: the AIRSTAGE identification on the front panel, the lower air-distribution louver, the operating indicators integrated beneath the unit, and, on the side, the label indicating the use of an A2L-classified refrigerant. This last feature is directly related to the R-32 used by the current Orion XLTH series.
The Fujitsu documentation provided for this range identifies the Orion XLTH as a single-zone wall-mounted series designed for cold climates, available in several capacities and capable of heating operation down to -26 °C.
Why the indoor unit’s location was crucial
In a small room or a space with few unobstructed wall surfaces, it is not enough to determine where a heat pump can physically fit. We must determine where it will be able to operate properly for years to come.
In this installation in Terrasse-Vaudreuil, the unit is positioned near the ceiling. The side view shows just how compact the installation is. This positioning preserves almost the entire wall surface below the unit, which is a valuable advantage when the space must remain available for furniture, storage, or simply to maintain circulation in the room.
For this type of project, we specifically check:
- the actual available height;
- the clearances specified by the manufacturer;
- access to the front panel and filters;
- the path of the discharged air;
- proximity to corners and partitions;
- the routing of the refrigerant lines;
- the ability to maintain a proper slope for condensate drainage;
- future access for cleaning the evaporator and fan;
- the visible finish around the unit.
An improper location choice can result in a system that is difficult to maintain or has imperfect air distribution, even when the heat pump itself is highly efficient.
A detail visible in the photo: the minimum height indicated on the unit
The close-up photograph shows the technical label located on the side of the unit. It notably indicates a minimum installation height of 1.8 m, where this requirement applies.
This type of information becomes particularly important with equipment using R-32, since the manufacturer provides specific instructions regarding installation, refrigerant quantity, and certain room characteristics.
At AirGreen, we therefore never consider an R-32 heat pump to be merely a visual replacement for an older R-410A unit. The model, location, piping, electrical requirements, and manufacturer's specifications must all be checked together.
Fujitsu Orion XLTH: a range designed for Quebec's cold climate
For a property in Terrasse-Vaudreuil, located in the Vaudreuil-Soulanges area, low-temperature heating capacity is a much more important criterion than a simple summer cooling rating.
The Fujitsu brochure describes the Orion XLTH series as a range designed for cold-climate heating, with a heating operating range from -26 °C to 24 °C. All the capacities listed in the documentation have this same lower operating limit.
The series presented includes the following combinations:
- ASUH09KZAS / AOUH09KZAH1
- ASUH12KZAS / AOUH12KZAH1
- ASUH15KZAS / AOUH15KZAH1
- ASUH18KZAS / AOUH18KZAH1
- ASUH24KZAS / AOUH24KZAH1
According to the Fujitsu technical specifications, the corresponding rated cooling capacities are 9,000, 12,000, 14,500, 18,000, and 22,000 BTU/h, respectively. The rated heating capacities are higher, at 12,000, 16,000, 18,000, 21,600, and 25,200 BTU/h.
Why we do not determine BTU capacity from the casing
The photo clearly identifies the Fujitsu AIRSTAGE family, but it does not allow us to read the complete model number of this particular installation with sufficient certainty.
It would therefore be incorrect to claim, based solely on the unit’s appearance, that it is, for example, a 9,000 or 12,000 BTU model.
Several models in the range use casings with similar dimensions. To confirm an installation’s capacity, we use the nameplate and the indoor and outdoor model numbers, rather than a visual estimate.
This method avoids a common mistake when a homeowner wants to replace an old heat pump: assuming its capacity simply because its casing appears small or large.
Energy efficiency varies according to the selected capacity
One of the interesting features of the Orion XLTH series is its efficiency level. The Fujitsu technical data sheet provides the following TRÈS2 values:
| Series capacity | Rated cooling | Rated heating | TRÈS2 |
|---|---|---|---|
| 09K | 9,000 BTU/h | 12,000 BTU/h | 33,1 |
| 12K | 12,000 BTU/h | 16,000 BTU/h | 30,5 |
| 15K | 14,500 BTU/h | 18,000 BTU/h | 27,5 |
| 18K | 18,000 BTU/h | 21,600 BTU/h | 25,5 |
| 24K | 22,000 BTU/h | 25,200 BTU/h | 24,0 |
The brochure also identifies these configurations under the ENERGY STAR, ENERGY STAR Cold Climate and ENERGY STAR Most Efficient ratings.
A very high efficiency rating is still only useful when the system’s capacity properly matches the building. An oversized wall-mounted heat pump is not automatically a better heat pump.
In our projects in Montréal, Laval, Longueuil, on the North Shore, the South Shore and in Vaudreuil-Soulanges, we therefore place particular importance on sizing. Insulation, windows, the building’s orientation, the number of floors, the layout of the rooms and heat losses are all part of the analysis.
True modulation capacity thanks to Inverter technology
The Orion XLTH is equipped with an Inverter compressor.
This technology allows the system to adapt its output to demand rather than being limited to fully stopped or full-capacity operation. For the user, this helps maintain a more stable temperature and reduce sudden changes in comfort.
This modulation capacity is particularly valuable during transitional seasons. In Terrasse-Vaudreuil, an October day obviously does not require the same amount of heating as a January night. The system can therefore adjust its operation according to the load instead of treating every situation the same way.
Heating performance that remains significant in extreme cold
Fujitsu’s technical data sheet goes beyond the simple claim that it “operates down to -26 °C.”
For each capacity, the manufacturer also provides the maximum available heating percentage at different temperatures. At -21 °C, for example, the five models indicate 154%, 124%, 126%, 127%, and 95%, respectively, of their nominal reference capacity. At -26 °C, the stated values are still 127%, 102%, 109%, 106%, and 80%, depending on the model.
These figures show why it is necessary to look well beyond the minimum temperature stated in an advertisement. To evaluate a heat pump intended for Quebec, it is important to consider its actual available capacity in cold weather.
R-32 and A2L classification: a clearly visible feature of this installation
The photo of the unit installed in Terrasse-Vaudreuil shows the A2L pictogram on its side label. This detail is consistent with the specifications of the new Orion XLTH series, which operates with R-32 refrigerant.
In its brochure, Fujitsu compares a global warming potential of 2,088 for R-410A with 675 for R-32, representing an announced 68% reduction in GWP.
The change in refrigerant is not merely environmental information. In the field, it also requires following procedures suited to the product being used.
This is particularly relevant when replacing an older installation. Before reusing anything, we must verify that the existing components comply with requirements and are compatible with the new system.
This Terrasse-Vaudreuil project shows why installation matters just as much as the heat pump selected.
Different piping sizes depending on the Orion XLTH model
The piping is an excellent example of a detail that becomes invisible after the work is completed but is crucial to the system’s operation.
In the Orion XLTH series:
- the 09K and 12K models use 1/4 in. liquid and 3/8 in. gas lines;
- the 15K model uses 1/4 in. liquid and 1/2 in. gas lines;
- the 18K and 24K models use 3/8 in. liquid and 5/8 in. gas lines.
It is therefore not enough to say: “A heat pump line is already installed, so we can reuse it.”
We need to know its diameter, condition, the refrigerant previously used, its route, and its compatibility with the intended indoor/outdoor combination.
This verification can prevent performance issues, costly corrections, and, most importantly, the installation of a machine on infrastructure that does not meet the manufacturer’s requirements.
Long routing options when the building configuration requires them
Fujitsu specifies different maximum piping lengths depending on capacity:
- 25 m, or 82 ft, for the 09K and 12K;
- 30 m, or 98 ft, for the 15K;
- up to 50 m, or 164 ft, for the 18K and 24K.
Maximum vertical differences also vary from 20 to 30 m depending on capacity.
This allowance provides valuable flexibility in some buildings where it is impossible to place the outdoor unit directly behind the evaporator.
This does not mean that we seek to create long installations when they are unnecessary. A simple, logical, and accessible route generally remains preferable when the building configuration allows it.
An indoor unit that can operate at only 23 dB, depending on the model
Noise is often one of the first concerns when we install a wall-mounted heat pump in a bedroom or a space occupied for long periods.
Fujitsu indicates indoor operation in quiet mode as low as 23 dB(A) for the 09K and 12K models. The 15K is listed at 26 dB(A), while the 18K and 24K models are rated at 30 dB(A) in quiet mode.
Installation quality also plays a role in acoustic comfort. A unit must be properly secured, and the outdoor installation must be designed to limit unnecessary vibration transmission to the building structure.
Six fan speeds plus automatic mode
Air distribution is not limited to a single speed.
The documentation indicates six fan speeds plus automatic mode: high, medium-high, medium, medium-low, low, and quiet operation.
The vertical louver is motorized automatically, while horizontal adjustment is listed as manual in the technical specifications.
At the Terrasse-Vaudreuil installation, the lower louver is clearly visible in the photo. Its clearance is particularly important given the unit’s proximity to the ceiling and surrounding surfaces.
We need to ensure that the airflow can be directed into the room without an immediate obstruction compromising its reach.
Built-in Wi-Fi and remote control
The Fujitsu AIRSTAGE Orion XLTH series also includes built-in Wi-Fi connectivity, enabling remote monitoring and control using the AIRSTAGE mobile app.
Fujitsu also offers several control and integration options, including wired controllers, external interfaces, and solutions compatible with BACnet and Modbus in certain configurations.
In a residence, Wi-Fi primarily provides convenience: checking operation, changing the temperature before returning home, or adjusting settings without being in front of the remote control.
A power supply suited to the selected model
All five documented capacities operate at 208 to 230 V, 60 Hz, single-phase.
The Fujitsu documentation states:
- a 15 A circuit breaker for the 09K and 12K;
- a 20 A circuit breaker for the 15K, 18K, and 24K.
This explains why we check the electrical infrastructure before installation. Choosing a capacity first and then discovering that the available circuit does not match the unit is a poor way to plan an HVAC project.
A base pan heater designed for very cold regions
The outdoor unit’s design also includes a base pan heater, a feature Fujitsu specifies for regions with extremely cold climates.
In winter, defrosting produces water around the outdoor coil. Managing this water and ice is therefore an important consideration for any heat pump installation in Quebec.
The outdoor unit’s placement must account for snow, winter drainage, ice accumulation, and the access required for maintenance.
A common mistake: looking only at the price or the number of BTUs
When comparing wall-mounted heat pump projects in Terrasse-Vaudreuil, two systems with similar nominal capacities may perform very differently in January.
To make a useful comparison, we recommend checking in particular:
- the heating capacity actually available at low temperatures;
- energy efficiency;
- noise level;
- minimum and maximum modulation;
- pipe dimensions;
- the refrigerant used;
- electrical requirements;
- the quality of the proposed installation;
- future maintenance options;
- the model’s actual eligibility for the subsidy programs applicable at the time of the work.
The rebate should never be assumed solely because a series carries ENERGY STAR certification. Eligibility must be verified based on the exact combination of units, the required reference numbers, and the program rules in effect at the time of installation.
A compact finish that preserves the room’s usable space
This Terrasse-Vaudreuil project is particularly visually interesting because the indoor unit is installed very high on the wall.
Rather than unnecessarily lowering the unit into the room, we achieved a compact installation that preserves usable wall space while integrating the heat pump neatly into the existing environment.
The side photo also shows a clean finish around the unit, without a visually bulky installation in the foreground. This is exactly the type of project where measurements taken before drilling make the difference.
A few centimetres can determine whether the unit truly appears integrated into the room or simply added afterward.
Future maintenance must be considered from the day of installation
An installation is not complete simply because the heat pump is working when we leave.
The filters will need to be cleaned. The indoor heat exchanger will eventually need to be inspected and cleaned. The fan may require a deep cleaning after several seasons of use.
That is why we consider accessibility from the moment of installation.
The Orion XLTH series uses washable filters, and Fujitsu also mentions high-corrosion-resistant copper ProCore coils for the indoor unit.
Regular maintenance is nevertheless necessary to maintain adequate airflow and prevent dust from accumulating on the evaporator and blower wheel.
What this Fujitsu installation in Terrasse-Vaudreuil represents for us
This HVAC installation in Terrasse-Vaudreuil is a good example of how we work at AirGreen: selecting equipment suited to Quebec’s climate, then giving equal attention to how it will actually be installed in the building.
The Fujitsu AIRSTAGE Orion XLTH offers several interesting features: heating operation down to -26 °C, Inverter technology, R-32 refrigerant, an A2L classification visible on the unit, integrated Wi-Fi, low noise levels, ProCore coils, and several capacities that make it possible to adapt the equipment to the building’s needs.
But the equipment is only one part of the project.
The evaporator’s positioning, drainage, piping, connections, electrical installation, choice of outdoor location, and access for HVAC maintenance also determine the quality of the result.
Whether the project is located in Terrasse-Vaudreuil, Vaudreuil-Dorion, Montréal, Laval, Longueuil, on the North Shore or on the South Shore, our objective remains the same: to carry out a clean, technically sound installation suited to the building rather than applying exactly the same configuration to every home.