In Saint-David, a Fujitsu Orion XLTH installation adapted to an outdoor location that required genuine technical consideration
This installation of a Fujitsu AIRSTAGE Orion XLTH wall-mounted heat pump in Saint-David presents a context very different from a typical ground-level installation. The outdoor unit was positioned on a rooftop terrace surface, immediately beside a large glass façade, with limited clearance and several physical constraints around the appliance.
In this type of project, choosing the system is important, but how the heat pump is installed is equally important. We must consider airflow, mechanical stability, winter drainage, maintenance access, protection of the membrane or roofing material, and the routing of the refrigerant lines.
In the photo of our installation, it is clear that the Fujitsu AIRSTAGE outdoor unit operates with R-32 refrigerant and was installed on a raised metal support. The insulated refrigerant lines follow a short route to the building, while the appliance remains clear of the roofing material.
This installation clearly illustrates our approach at AirGreen: we seek to adapt each HVAC installation to the actual building rather than applying exactly the same method everywhere.
Fujitsu technical documentation identifies the AIRSTAGE Orion XLTH as a single-zone wall-mounted series in the Orion CTEB family, designed for heating in cold climates down to -26 °C. The range includes several capacities, from 09KZAH1 to 24KZAH1.
What the installation photo in Saint-David shows us
Several technical elements are visible in this installation:
- the Fujitsu AIRSTAGE Orion XLTH outdoor unit;
- the identification R32 directly on the cabinet;
- an installation on an accessible terrace or roof;
- a rigid metal support that raises the heat pump;
- support points beneath the appliance’s feet;
- insulated refrigerant piping following a compact route to the structure;
- a space provided beneath the machine to facilitate the drainage of defrost water;
- an installation very close to the façade, but without placing the unit directly on the surface;
- a configuration where future maintenance and access to service panels remain important considerations.
The photograph does not make it possible to read the exact model number on the nameplate with certainty. We therefore cannot claim whether this installation is a 9,000, 12,000, 15,000, 18,000, or 24,000 BTU version of the range without inventing information that is not visible.
However, the Fujitsu technical specifications make it possible to explain the potential characteristics of this family of units precisely.
A heat pump designed for real heating in Quebec winters
For a property located in Saint-David, a heat pump’s ability to operate when the temperature drops well below freezing is one of the most important criteria.
Fujitsu publishes a heating operating range of -26 °C to 24 °C for the entire Orion XLTH series.
This figure should be distinguished from simple nominal capacity in BTUs. A heat pump can continue operating at low temperatures, but the determining factor for comfort is the amount of heat it can still produce.
The technical specifications show that several models retain remarkable heating capacity at very low temperatures. For example, the 12KZAH1 model is listed at 138% of its nominal capacity at -15 °C, 124% at -21 °C, and 102% at -26 °C, according to the reference conditions published by Fujitsu.
The 15KZAH1 is rated at 140% at -15 °C, 126% at -21 °C, and 109% at -26 °C.
These figures demonstrate why the XLTH designation, associated with cold-climate heating, is relevant in a region where the heat pump must genuinely contribute to heating the home during winter.
Why we raised the outdoor unit
One of the most important details in the photo is the support beneath the unit.
The outdoor unit is not placed directly on the roof covering. It is installed on a metal structure that creates significant clearance beneath the machine.
This choice offers several advantages.
Facilitating drainage during defrost cycles
When a heat pump operates in heating mode, frost can form on the outdoor coil. The system periodically runs a defrost cycle to melt this buildup.
The water produced must then drain away.
On a roof or terrace, an installation that is too low can promote the formation of an ice sheet beneath the unit. This ice can gradually rise toward the lower tray, hinder drainage, or make access more difficult.
By creating space beneath the unit, we promote freer drainage.
Fujitsu also specifies that the outdoor unit in the Orion XLTH series incorporates a base pan heater designed for extremely cold climate regions.
The base pan heater and the support do not replace one another. Rather, they work together to help the appliance better handle winter conditions.
Protecting the surface beneath the heat pump
A rooftop installation also requires consideration of the roofing material beneath the equipment.
The unit’s weight must be distributed properly, and the support should not unnecessarily create pressure points or damage.
In the photo, the installation is arranged to keep the machine above the surface while providing it with a rigid base.
A compact outdoor unit, useful when space is limited
The photo clearly demonstrates the reality of many installations in Montreal, Laval, Longueuil, the North Shore, and the South Shore: available outdoor space is not always generous.
In Saint-David, the machine is located near a large glazed façade, with another visible unit nearby. The positioning therefore had to be precise.
According to the Fujitsu specification sheet, the outdoor units of the 09KZAH1, 12KZAH1, and 15KZAH1 versions measure approximately 799 mm wide, 632 mm high, and 290 mm deep. The 18KZAH1 and 24KZAH1 versions also retain a width of 799 mm and a height of 632 mm for the outdoor unit shown in the technical table.
This compact format can be advantageous in difficult locations, but a compact unit must still comply with the required clearances for air intake and discharge.
We therefore avoid choosing the location solely because the heat pump “fits” in the space. We also assess how it will operate in the future.
The Fujitsu Orion XLTH in detail: what you need to understand before choosing its capacity
A range from 9,000 to 22,000 BTU/h in nominal cooling capacity
The series presented in the Fujitsu specification sheet includes five models.
Their nominal cooling capacities are:
- 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, these same models provide 12,000, 16,000, 18,000, 21,600, and 25,200 BTU/h.
It is therefore important not to confuse an appliance’s commercial model number with its exact capacity in each mode.
Sizing must be based on the building’s actual heating load, room layout, insulation, window area, and intended use.
TRÈS2 efficiencies of up to 33.1
Energy efficiency also varies according to capacity.
Fujitsu publishes the following TRÈS2 values:
- 09KZAH1 : 33,1
- 12KZAH1 : 30,5
- 15KZAH1 : 27,5
- 18KZAH1 : 25,5
- 24KZAH1 : 24,0
The specifications also list ENERGY STAR, ENERGY STAR Cold Climate, and ENERGY STAR Most Efficient ratings for these appliances.
These results place the smaller capacities at particularly attractive efficiency levels for a cold-climate wall-mounted heat pump.
R-32: the refrigerant visible directly on the Saint-David unit
Identification R32 is clearly visible on the photographed heat pump.
Fujitsu states a global warming potential of 675 for R-32, compared with 2088 for R-410A, which the documentation presents as a 68% reduction in GWP.
The manufacturer also states that its R-32 appliances can operate with a reduced amount of refrigerant while maintaining their heating performance.
For us, this mainly means that an installation must be carried out using the procedures, tools, and components appropriate for the R-32 system.
Inverter technology: more than a simple on-off mode
The Orion XLTH series uses an Inverter compressor.
Instead of always operating at full power and stopping as soon as the target temperature is reached, the system can adjust its operation according to demand.
This modulation helps maintain a more stable temperature and reduces comfort fluctuations.
In a home where the heat pump operates for long periods in heating mode, this modulation capability becomes particularly valuable.
Fujitsu documentation also associates the Inverter with improved energy efficiency and more consistent comfort.
Indoor operation that can go as low as 23 dB(A)
Noise is often an important concern when the indoor unit is installed in a living room, bedroom, or open space.
Depending on capacity, the series can achieve very low sound levels in quiet mode.
The 09KZAH1 and 12KZAH1 models are rated at 23 dB(A) in quiet mode, the 15KZAH1 at 26 dB(A), and the 18KZAH1 and 24KZAH1 at 30 dB(A).
The outdoor units are rated between 46 and 49 dB(A) in cooling mode, depending on the model.
In a terrace installation or near windows, as here in Saint-David, the outdoor unit’s sound level is particularly relevant.
A backlit remote control and built-in Wi-Fi connectivity
The series also includes a backlit remote control and built-in Wi-Fi connectivity for remote monitoring with the AIRSTAGE app.
This can be useful for changing a temperature setting before returning home or adjusting operation when you are away.
Fujitsu also offers several optional controllers and interfaces. The documentation specifically mentions possible compatibility with BACnet and Modbus, which is particularly useful in certain building-management projects.
ProCore copper coils
The indoor unit in the range uses ProCore coils, described by Fujitsu as copper coils with high corrosion resistance.
This type of feature is often less visible than an energy-efficiency rating, but it remains important when assessing the overall durability of an HVAC system.
The diameter of the refrigerant lines varies according to capacity
One of the most common errors when replacing a heat pump is assuming that the existing lines can automatically be reused.
For the Fujitsu Orion XLTH, piping diameters differ by model.
Fujitsu states:
- 09KZAH1 and 12KZAH1: 1/4 in. liquid and 3/8 in. gas;
- 15KZAH1 : 1/4 in. liquid and 1/2 in. gas;
- 18KZAH1 and 24KZAH1: 3/8 in. liquid and 5/8 in. gas.
In the Saint-David photo, the pipes are insulated and follow a short route to the structure. Their exact diameter cannot be measured visually with sufficient precision, but we always check their compatibility with the installed model.
The maximum pipe length can reach 50 meters
The installation flexibility of this range is also noteworthy.
The specified maximum piping lengths are:
- 25 m for the 09KZAH1 and 12KZAH1;
- 30 m for the 15KZAH1;
- 50 m for the 18KZAH1 and 24KZAH1.
The maximum permitted vertical differences also vary according to capacity, ranging from 20 m to 30 m.
This type of flexibility becomes particularly practical in a multi-level building or when a condominium requires a specific outdoor location for the heat pump.
In the Saint-David project, however, we favored a compact route, which reduces the amount of visible piping and simplifies the layout.
An electrical supply to check before installation
The entire series operates at 208 to 230 V, 60 Hz, single-phase.
However, the required circuit breaker varies with capacity:
- 15 A for the 09KZAH1 and 12KZAH1;
- 20 A for the 15KZAH1, 18KZAH1, and 24KZAH1.
This variation shows why we always check the electrical panel before confirming certain work.
Even when a location is perfect for the outdoor unit, the installation cannot be properly planned without considering the available electrical supply.
Errors we avoid when installing on a roof or terrace
A heat pump installed on a roof requires additional attention.
Among the errors we want to avoid:
- place the unit directly on the cladding without an adequate support;
- neglect the amount of water produced during defrost cycles;
- leave the refrigerant lines poorly supported or unnecessarily exposed;
- place the machine too close to an obstacle that would obstruct its airflow;
- make access to the service panels more difficult;
- forget the risks associated with snow or ice accumulation;
- create vibrations transmitted to the structure;
- use piping that is incompatible with the exact model;
- oversize the machine solely to get “more BTUs.”
The installation photographed in Saint-David clearly shows a configuration in which the stand, the clearance beneath the unit, and the line routing were incorporated into the planning.
Why proper sizing remains more important than the largest available capacity
When a homeowner compares 12,000, 18,000, or 24,000 BTU models, it can be tempting to automatically choose the largest one.
This is not always a good strategy.
An oversized heat pump can reach the target temperature very quickly and run more short cycles. This can reduce dehumidification in summer and negatively affect comfort.
A properly sized unit can run longer at modulated output, which better aligns with the operating principle of Inverter technology.
At AirGreen, we consider the floor area, as well as many other factors: insulation, orientation, floor level, windows, ceiling height, room layout, and heat loss.
An installation that illustrates what we look for in an HVAC project
This Fujitsu Orion XLTH wall-mounted heat pump installation in Saint-David summarizes several aspects that we consider essential.
We have a machine designed for cold climates, R-32 refrigerant, an Inverter compressor, a base pan heater, and a stated heating range down to -26 °C.
But above all, we have an installation adapted to its location: a raised unit, a rigid stand, compact lines, drainage space, and physical access to the equipment.
It is this combination of product selection and project execution that truly determines the quality of an HVAC installation.
At AirGreen, we apply this same method in our projects in Montreal, Laval, Longueuil, on the North Shore, the South Shore, and throughout Greater Montreal. Each building has its own constraints, and we adapt the installation rather than trying to force a standard solution into an unsuitable location.
A quality heat pump deserves an installation that allows it to operate under the conditions for which it was designed. In Saint-David, the raised stand, the clearance beneath the Fujitsu unit, and the carefully routed lines are integral parts of this approach.