In Sainte-Barbe, an installation where the level, outdoor space, and airflow guided every decision
In this installation carried out in Sainte-Barbe, in Montérégie, a detail visible in the photo perfectly summarizes our approach to an HVAC installation: the spirit level placed directly on the Fujitsu AIRSTAGE outdoor unit.
It is not a forgotten accessory on the job site. It represents an essential verification step.
A Fujitsu AIRSTAGE Altair 700 wall-mounted heat pump must not simply be connected, powered, and turned on. The outdoor unit must be carefully positioned on a stable base, in a location that allows adequate airflow, while taking the façade, vegetation, the passage around the house, and the refrigerant piping into account.
The photo of this installation in Sainte-Barbe clearly shows several constraints frequently encountered on Quebec properties: a residential façade made of stucco and brick, a relatively narrow side space, a hedge immediately nearby, and the system's lines, which must be routed neatly to the building.
For us, this is precisely the type of project that demonstrates how a proper heat pump installation comes down to the details.
The spirit level: a small tool for an important check
The Fujitsu outdoor unit is photographed during the installation phase, with a level placed on its top panel.
This check allows us to confirm that the unit is properly resting on its support structure before considering the mechanical installation complete.
An improperly positioned outdoor unit can create several long-term problems:
- more noticeable vibrations;
- unnecessary stress on certain mounting points;
- less predictable behavior as defrost water drains;
- an unbalanced visual appearance;
- unnecessary strain on the piping connected to the system.
We are not simply looking for the unit to “look straight.” We actually verify its installation.
This attention is particularly important for a wall-mounted heat pump that will operate both during hot July days and throughout the cold periods of Quebec winter.
A relatively tight outdoor space
The photograph shows that the unit is installed in an area between the wall of the residence and a hedge.
This requires more thought than an installation carried out in the middle of a completely unobstructed wall.
We must consider all of the following simultaneously:
- the space required around the unit;
- air movement through the outdoor coil;
- access to the service panel;
- existing vegetation;
- the proximity of the wall covering;
- the refrigerant line routing;
- the possibility of carrying out future HVAC maintenance without having to dismantle surrounding elements.
A hedge may seem insignificant at the time of installation, but it continues to grow. It can also collect leaves and debris.
We therefore plan the installation with consideration not only for the current condition of the property, but also for the future use of the heat pump.
Vegetation around a heat pump: an easy mistake to avoid
On a property like this one in Sainte-Barbe, vegetation contributes to privacy and landscaping. There is no need to turn the area around the heat pump into a completely empty space.
However, branches should not be allowed to gradually approach the coil or air outlet.
An outdoor unit must be able to transfer heat efficiently with the outdoor air. Overgrown vegetation can interfere with this airflow and make cleaning more difficult.
Our advice is simple: after installing a wall-mounted heat pump, keep the area around the unit clean and monitor the growth of nearby shrubs.
This is one of the small maintenance tasks that helps preserve the intended operating conditions.
A Fujitsu AIRSTAGE using R-32 refrigerant
On the photographed outdoor unit, the Fujitsu AIRSTAGE identification is clearly visible.
The Altair 700 series is part of Fujitsu’s H-series single-zone wall-mounted systems and uses R-32 refrigerant. The documentation covers the 09KMAS1 and 12KMAS1 configurations.
Fujitsu presents R-32 with a global warming potential of 675, compared with 2,088 for R-410A, representing an announced GWP reduction of 68% in its documentation.
This refrigerant change is important for the HVAC industry.
For our technicians, this also means that work methods must match the refrigerant and equipment generation installed. Connections, circuit checks, evacuation, and commissioning must be carried out using the appropriate equipment and procedures.
Two capacities available in the Altair 700 range
Fujitsu’s technical documentation presents two versions of this series:
09KMAS1
- indoor unit: ASUH09KMAS;
- outdoor unit: AOUH09KMAS1;
- rated cooling capacity: 9,000 BTU/h;
- rated heating capacity: 12,000 BTU/h.
12KMAS1
- indoor unit: ASUH12KMAS;
- outdoor unit: AOUH12KMAS1;
- rated cooling capacity: 12,000 BTU/h;
- rated heating capacity: 14,000 BTU/h.
The photo from Sainte-Barbe confirms the Fujitsu AIRSTAGE series, but the detailed nameplate is not sufficiently legible to confidently assign either of these two capacities to the photographed system.
We prefer to retain this precision rather than turn an assumption into a technical specification.
An Inverter heat pump that modulates its capacity
One of the benefits of the Fujitsu Altair 700 is its Inverter technology.
The capacity is not limited to a single fixed value.
For the 9,000 BTU version, Fujitsu indicates a cooling range of 3,100 to 12,100 BTU/h and a heating range of 2,800 to 14,500 BTU/h.
For the 12,000 BTU version, modulation reaches:
- 3,100 to 13,800 BTU/h in cooling mode;
- 2,800 to 15,000 BTU/h in heating mode.
This modulation allows the system to adapt its operation more closely to the needs of the served zone.
When a room approaches its target temperature, the system can reduce its capacity rather than operating continuously according to a full-power on-off cycle.
For the homeowner, this generally contributes to more consistent comfort and quieter operation.
High efficiency ratings
The Fujitsu technical data sheet indicates a TRÈS2 of 30.0 for the 09KMAS1 and 27.5 for the 12KMAS1.
The regional V CPSC2 is listed as:
- 9,9 for the 9,000 BTU model;
- 8,5 for the 12,000 BTU model.
Both configurations are also associated with the ENERGY STAR ratings presented in the manufacturer’s documentation.
This information is particularly useful for a homeowner comparing several options for wall-mounted heat pumps in Sainte-Barbe, as well as in Montreal, Laval, Longueuil, on the North Shore or the South Shore.
Two units both bearing the “Inverter” label can have very different performance levels. That is why we always examine the complete specifications rather than just the number of BTUs listed on a quote.
Why the quality of the outdoor installation is just as important as the performance of the Fujitsu Altair 700
Heating down to -15 °C according to Fujitsu
The Altair 700 series has a stated heating operating range of -15 °C to 24 °C.
For cooling, the stated range is -10 °C to 50 °C.
However, it is important to distinguish the minimum operating temperature from the capacity required to heat an entire home.
A heat pump capable of operating at -15 °C does not automatically mean that it will cover 100% of the heating needs of any home at that temperature.
The load depends, among other things, on:
- the actual area being served;
- the level of insulation;
- the windows;
- the building's airtightness;
- the home's orientation;
- the layout of the rooms;
- heat losses.
This is why HVAC sizing remains a fundamental step.
Exterior dimensions that facilitate certain residential installations
The outdoor unit in the series measures approximately:
- 31 7/16 in. wide;
- 21 5/16 in. high;
- 11 7/16 in. deep.
Its weight is listed at approximately 71 lb.
Its relatively compact size is particularly relevant in a situation like Sainte-Barbe, where the unit must fit into an outdoor passage that already presents several constraints.
However, a compact machine must not be enclosed.
We must maintain sufficient space around the equipment so as not to compromise airflow and to allow for service operations.
The unit's base must remain stable
In the photo, the unit rests on a rigid support installed near the building.
The level used by our team allows us to finalize this adjustment precisely.
This step takes little time compared with the project as a whole, but it contributes to the final quality of the installation.
We specifically verify that:
- the support is stable;
- the equipment is properly positioned;
- the support points are consistent;
- no line is subjected to unnecessary stress;
- the unit remains accessible;
- the surrounding space is compatible with future operation.
This is the type of verification that customers do not always notice when they simply look at a newly installed heat pump, but it is part of our daily work at AirGreen.
Refrigerant piping: 1/4 in. liquid and 3/8 in. gas
Both versions of the Fujitsu Altair 700 use the same refrigerant line dimensions:
- 1/4 in. on the liquid side;
- 3/8 in. on the gas side.
The documentation indicates:
- minimum length: 10 ft;
- maximum length: 66 ft;
- maximum vertical difference: 49 ft;
- specified precharge for up to 49 ft of piping.
These limits provide some flexibility for connecting the indoor unit to the outdoor unit.
However, they do not justify an unnecessarily complex route.
In a residential project, we generally seek a solution that is technically compliant, protected, and discreet.
208 to 230 V and a 15 A circuit breaker
The Fujitsu specification sheet indicates a power supply of 208 to 230 V / 60 Hz / single-phase with a 15 A circuit breaker for both documented configurations.
The maximum heating current is listed as 9,4 A for both versions. In cooling, the maximum is 6,4 A for the 09KMAS1 and 6,9 A for the 12KMAS1.
The electrical verification must always be based on the exact model installed and its nameplate.
For us, this is something that should be addressed during project preparation, not after the equipment has been installed.
Indoor operation as low as 19 dB(A)
The outdoor section photographed in Sainte-Barbe tells only half the story of the system.
Indoors, Fujitsu states that sound levels can drop to just 19 dB(A) in quiet cooling mode, and 21 dB(A) in heating.
The fan has four speeds as well as an automatic mode.
Outdoor sound levels vary by capacity:
- 09KMAS1 : 44 dB(A) in cooling / 47 dB(A) in heating;
- 12KMAS1 : 48 dB(A) / 50 dB(A).
In an installation where the unit is relatively close to the house, this characteristic should be considered when choosing the location.
Integrated Wi-Fi and remote control
The Altair 700 series documentation also mentions integrated Wi-Fi connectivity, with remote monitoring through the AIRSTAGE mobile app.
For a homeowner, this feature can be used to:
- change a setting without being in front of the unit;
- adjust the heating before returning home;
- control the air conditioning while away;
- more easily manage a zone whose use varies throughout the day.
Fujitsu also offers several optional interfaces and controllers, including BACnet and Modbus integration options in certain configurations.
ProCore copper coils
On the indoor-unit side, the series uses ProCore coils, which Fujitsu describes as copper coils with high corrosion resistance.
The indoor unit also uses washable filters.
This highlights another important principle: even a highly efficient unit needs maintenance.
Dust-laden filters or an outdoor coil obstructed by debris can impair airflow and the unit’s normal operation.
The installation mistakes this reminds us to avoid
A job-site photo like this one may look simple, but it helps summarize several best practices.
In particular, we avoid:
- to install a unit on an unstable base;
- to neglect checking that it is level;
- to crowd the unit with vegetation;
- to place the service panel in an inaccessible area;
- to use incorrect pipe dimensions;
- to create tension in the lines;
- to choose capacity based solely on floor area;
- to neglect condensate water management;
- to let shrubs gradually overgrow the coil;
- to consider start-up as the only final check required.
For our installations in Montreal, Laval, Longueuil, the North Shore, the South Shore, and Montérégie, these principles remain the same, even though the architecture and terrain vary from one home to another.
Why sizing remains essential with an Inverter system
It can sometimes be tempting to think that an Inverter heat pump can automatically compensate for any capacity choice.
That is not the case.
Modulation offers greater flexibility, but sizing must still match the needs of the zone.
A properly selected system can make better use of its modulation range, whereas a significantly oversized machine may not operate under the conditions in which it provides the best comfort.
At AirGreen, we therefore look at the building before focusing solely on the number shown on the box.
Rebates: always verify the exact combination
Fujitsu documentation lists the 09KMAS1 and 12KMAS1 systems with several ENERGY STAR classifications, including a category associated with cold climates.
This may be relevant when a homeowner is seeking a heat pump rebate in Quebec.
However, the exact indoor-outdoor combination, the references required by the program, and the eligibility conditions in effect at the time of the project must be verified.
We avoid announcing a fixed amount simply because a brochure bears the ENERGY STAR logo.
An installation in Sainte-Barbe showing the work before start-up
What we particularly appreciate about this job-site photo is that it shows a step that is rarely highlighted: verification.
The unit is installed. The lines are in place. The Fujitsu AIRSTAGE is positioned near the building. Yet our work is not considered complete simply because the equipment is standing upright.
The level is still on the heat pump.
This image nicely sums up our approach to a professional HVAC installation: measure, check, adjust, and only then finalize.
In Sainte-Barbe, this Fujitsu AIRSTAGE Altair 700 wall-mounted heat pump was integrated into an outdoor setting where the façade, vegetation, and available space all had to be considered. The result therefore depends not only on Fujitsu’s technical specifications, but also on how they were applied in the field.
This is the same care we bring at AirGreen to our heat pump and HVAC system installations throughout Montreal, Laval, Longueuil, the North Shore, the South Shore, and Montérégie.