In Saint-Nazaire-d’Acton, an installation whose quality is also evident in the exterior details
For this installation carried out in Saint-Nazaire-d’Acton, we installed a FUJITSU AIRSTAGE ORION XLTH wall-mounted heat pump, a range designed to provide both summer cooling and heating in demanding winter conditions. The project photo shows an aspect we consider essential at AirGreen: a proper HVAC installation is never limited to turning on an outdoor unit. Positioning, piping, electrical supply, conduit protection, vibration damping, and service accessibility all matter just as much.
The FUJITSU AIRSTAGE outdoor unit visible in the photo is installed on wall brackets above ground level. The R32 marking, the electrical disconnect installed nearby, and the protected routing of the refrigerant and electrical lines along the exterior siding are also visible.
This configuration is particularly appealing for a Quebec property because it keeps the unit off the ground while creating a compact, orderly installation.
A FUJITSU ORION XLTH designed for cold-climate heating
The FUJITSU AIRSTAGE ORION XLTH series, also presented in the technical documentation as the Orion CTEB series, is a range of single-zone wall-mounted heat pumps using R32 refrigerant.
According to the technical specifications provided by Fujitsu, the range can operate in heating mode down to -26 °C and in cooling mode at outdoor temperatures of up to 50 °C. It also uses an Inverter compressor, which adjusts the heat pump’s operation to actual needs rather than operating solely according to a traditional on-off cycle.
For a home in Saint-Nazaire-d’Acton, this operating range is particularly relevant. A wall-mounted heat pump selected for Quebec must be evaluated based on its actual low-temperature heating capacity, not just its rated cooling capacity.
A complete range rather than a single capacity
One important detail should be clarified: the site photo clearly identifies the FUJITSU AIRSTAGE family, the R32 refrigerant, and the system’s outdoor configuration, but it does not show the nameplate clearly enough to confirm the exact capacity of this unit without ambiguity.
We therefore prefer not to arbitrarily assign a BTU rating to this installation.
The ORION XLTH series presented in the Fujitsu specification sheet includes:
- 09KZAH1 : 9,000 nominal BTU/h for cooling;
- 12KZAH1 : 12,000 nominal BTU/h for cooling;
- 15KZAH1 : 14,500 nominal BTU/h;
- 18KZAH1 : 18,000 nominal BTU/h;
- 24KZAH1 : 22,000 nominal BTU/h.
The nominal heating capacities are even higher than the nominal cooling capacities in this series. For example, the 12K version is rated at 16,000 nominal BTU/h for heating, while the 18K reaches 21,600 BTU/h and the 24K reaches 25,200 BTU/h.
This distinction is essential when sizing a wall-mounted heat pump. Two homes of similar size may require different capacities depending on insulation, windows, building orientation, air infiltration, interior layout, and the actual use of the space.
Why We Avoid Oversizing a Wall-Mounted Heat Pump
Installing the largest available heat pump is not automatically the best decision.
An oversized unit can reach the requested temperature very quickly, reduce its modulation cycles, and provide less consistent humidity control in summer. A properly sized heat pump can generally run longer at partial load, promoting a more stable temperature and better use of Inverter technology.
At AirGreen, choosing between a 9,000, 12,000, 15,000, 18,000, or 24,000 BTU unit should therefore be based on the building itself, not simply on a rough rule based on floor area.
Exceptionally high energy efficiency in the smaller capacities
The ORION XLTH specification sheet shows very impressive efficiency ratings, particularly for the lower-capacity models.
The 09KZAH1 version has a SEER2 of 33.1, while the 12KZAH1 reaches 30.5. The larger versions have ratings of 27.5, 25.5, and 24.0, respectively.
All models listed in the documentation also carry ENERGY STAR ratings, including the cold-climate designations indicated by the manufacturer.
For a homeowner comparing different wall-mounted heat pumps, this type of data is much more useful than a simple claim that a machine is “economical.” Performance must be compared at equivalent capacity and with winter heating taken into account.
Actual eligibility for a heat pump rebate in Quebec must always be verified using the exact model, the applicable reference number, and the program criteria in effect at the time of the application.
R32: clearly identifiable on the installed unit
In the photo from the Saint-Nazaire-d’Acton job site, the symbol R32 appears directly on the front panel of the outdoor unit.
According to Fujitsu, R32 has a lower global warming potential than R410A. The documentation indicates a GWP of 675 for R32 compared with 2088 for R410A, representing an announced reduction of 68%.
For the installer, changing the refrigerant does not simply mean using a different cylinder. The equipment, handling procedures, and commissioning best practices must be adapted to the refrigerant specified by the manufacturer.
This is also an additional reason to avoid improvisation when replacing a heat pump.
The base pan heater: an important detail for Quebec winters
The documentation for the ORION XLTH series also indicates that the outdoor unit is equipped with a base pan heater designed for extremely cold regions.
When a heat pump operates in heating mode during the winter, it must periodically perform defrost cycles. The water generated must be able to drain properly rather than gradually forming an accumulation of ice beneath the outdoor heat exchanger.
The choice of location for the outdoor unit is therefore directly related to its winter operation.
A wall-mounted installation that keeps the outdoor unit above the ground
In our Saint-Nazaire-d’Acton installation, the outdoor unit is mounted on a metal wall bracket rather than placed directly on a slab at ground level.
This approach offers several practical advantages:
- it keeps the unit farther away from ordinary accumulations of snow on the ground;
- it makes cleaning around the machine easier;
- it prevents a settled or shifted slab from changing the unit’s position;
- it allows for a compact installation along the foundation;
- it facilitates access to the connections during future HVAC maintenance.
We can also distinguish, beneath the mounting points, components designed to limit the direct transmission of vibrations between the heat pump and its support.
A wall-mounted installation must nevertheless be carried out properly. The choice of anchors, the wall structure, and the positioning of the supports directly affect the stability of the entire assembly.
A clean, protected line routing
The right side of the photo also shows the vertical routing of the heat pump connections.
Some of the lines are installed in a white outdoor line set cover, which protects the connections while providing a cleaner finish on the house siding. The transition to the outdoor unit is grouped compactly rather than leaving several cables and pipes to follow different paths.
This detail may seem simple, but it makes a big difference in a completed installation.
In our installations of wall-mounted heat pumps in Montreal, Laval, Longueuil, the North Shore, and the South Shore, we pay the same attention to the routing of the lines. An outdoor installation remains visible for many years, so its appearance should not be treated as a secondary detail.
An electrical disconnect positioned nearby
To the right of the heat pump, an outdoor electrical disconnect is clearly visible.
This component makes it possible to isolate the equipment's power supply when maintenance or diagnostic work must be carried out. Positioning it near the machine also makes the technician's work easier.
The ORION XLTH series operates at 208-230 V, 60 Hz, single-phase. Fujitsu documentation specifies a 15 A circuit breaker for the 09K and 12K models, and 20 A for the 15K, 18K, and 24K capacities.
The electrical circuit must obviously be selected based on the exact model installed, not on the physical appearance of the outdoor unit.
A heat pump that can remain very quiet
Acoustic comfort is often a major consideration when choosing a wall-mounted heat pump.
Fujitsu states that this series can achieve an indoor sound level as low as 23 dB(A) on certain capacities in quiet mode. The outdoor values listed in the technical specifications range from 46 to 50 dB(A), depending on the model and operating mode.
The positioning of the outdoor unit nevertheless remains important.
A relatively quiet machine can become bothersome if it is mounted in a location that amplifies vibrations or if its airflow is directed toward an unsuitable area. Installation is therefore an integral part of the acoustic result.
Built-in Wi-Fi and remote control
Fujitsu documentation also indicates built-in Wi-Fi connectivity for remote monitoring and control through the AIRSTAGE mobile app.
For the homeowner, this means it is possible to adjust the temperature or certain system functions without being directly in front of the indoor unit.
The series also supports various wired control and integration options, including BACnet- and Modbus-compatible interfaces in certain configurations. This flexibility can be useful when a residential system needs to be integrated into a more advanced control system.
ProCore coils for the indoor unit
FUJITSU also highlights its ProCore coils, made of highly corrosion-resistant copper, on the indoor unit in this range.
This is less visible to the homeowner than the appearance of the wall-mounted cabinet, but it deserves consideration when comparing the internal construction of different units.
The backlit remote control, the multiple fan speeds, and the energy-saving modes are also among the features listed by the manufacturer.
What this Saint-Nazaire-d’Acton installation shows about the way we work
We treat the outdoor unit as a complete part of the project
The photo of this FUJITSU ORION XLTH installation sums up our approach quite well.
The unit is elevated on its bracket. The disconnect switch is accessible. The conduits are grouped and protected. The route between the line set cover and the unit remains compact. The brackets are installed to keep the unit securely in place.
These are precisely the details that sometimes become noticeable only after seeing a less carefully executed installation.
At AirGreen, we want the installation to remain logical for the next technician who services the system in five or ten years. A heat pump should not simply be installed to work on the day it is commissioned; it should remain accessible for cleaning, diagnostics, and future repairs.
The mistake to avoid: choosing solely based on the price of the unit
When a homeowner compares several quotes for wall-mounted heat pumps, it is tempting to look only at the brand name and the total price.
Two proposals using exactly the same FUJITSU system can nevertheless produce two very different results.
In particular, it is important to compare:
- the actual sizing;
- the location of the indoor unit;
- the location and height of the outdoor unit;
- the length and diameter of the piping;
- outdoor protection for the lines;
- water drainage;
- the supports and vibration-isolation components;
- the electrical circuit;
- the quality of the vacuum evacuation and commissioning;
- future accessibility for maintenance.
The heat pump is one part of the project. The quality of the HVAC installation determines how this machine will actually perform in the home.
Piping diameters vary according to capacity
The Fujitsu specifications clearly illustrate why the exact model must be known before reusing existing piping.
For the 09K and 12K versions, the specified dimensions are:
3/8 in. gas and 1/4 in. liquid.
The 15K uses:
1/2 in. gas and 1/4 in. liquid.
The 18K and 24K models, meanwhile, use:
5/8 in. gas and 3/8 in. liquid.
This means that a heat pump replacement should never be approached with the assumption that “the existing pipes will necessarily be suitable.”
Compatibility must be verified.
The possible piping lengths offer good flexibility
Depending on the selected capacity, Fujitsu allows maximum lengths ranging from 25 m to 50 m, with maximum vertical differences ranging from 20 m to 30 m depending on the model.
This flexibility facilitates certain installations where the indoor unit must be located far from the ideal position of the outdoor unit.
However, it is still preferable to design a rational route. Adding unnecessary piping increases the project cost, complicates the finishing work, and may require precise refrigerant charge adjustments based on the actual length.
An installation adapted to Quebec conditions
The FUJITSU AIRSTAGE ORION XLTH combines several features that are particularly relevant to our climate: heating operation down to -26 °C, Inverter technology, a base pan heater, R32 refrigerant, an ENERGY STAR rating, quiet operation, and different capacities suited to various room or zone sizes.
But the Saint-Nazaire-d’Acton project above all serves as a reminder of one thing: even an excellent heat pump must be properly installed.
It is precisely in the execution that our work becomes most important.
From Saint-Nazaire-d’Acton to Montréal, Laval, Longueuil, the North Shore and the South Shore, we apply this same approach to our installations of wall-mounted heat pumps, central systems and other HVAC equipment: selecting the right machine, anticipating its winter performance, protecting the connections, ensuring compliant electrical installation, and leaving behind a clean, accessible and durable system.