A Fujitsu inner head calibrated to the nearest degree for uniform comfort and real savings
Project background
In a plex in Villeray–Saint-Michel–Parc-Extension, the owner wanted a four-season solution capable of effectively cooling the living areas in the summer and reducing the electricity bill in mid-season and early winter. We recommend a Fujitsu wall-mounted heat pump from the Orion XLTH (R-32) family , known for its resistance to Quebec cold, its fine modulation and its silence. The interior head is installed high under the ceiling , close to a recessed light point, in order to benefit from a natural draft and even diffusion in the central area.
Why the Orion XLTH (R-32) family
-
Wide modulation range inverter technology : the machine adjusts the power to the actual need, avoiding short cycles and unnecessary noise.
-
Extreme cold : XLTH design optimized for low outdoor temperatures, ideal for Montreal.
-
R-32 refrigerant : better seasonal efficiency than R-410A, reduced charge and GWP.
-
Acoustics : tangential fan and rigid frame limiting vibrations, perfect for rest areas.
-
Filtration : washable cartridges accessible from the front, ensuring simple HVAC maintenance .
The standard sizing for this type of unit in urban housing is between 12,000 and 15,000 BTU , refined by a thermal balance (insulation, orientation, infiltration). This approach avoids oversizing, which is responsible for cold drafts and a drop in efficiency.
Interior layout: top of wall, controlled diffusion
-
Installation height ~2.2 m to free up air intake and avoid hot recirculation to the ceiling.
-
Side clearances respected to facilitate maintenance and sweeping of the shutters.
-
Orientation of the vanes : in air conditioning mode, tilt slightly towards the horizontal to carry fresh air far away; in heating mode, lower vanes to limit stratification.
-
Finishes : discreet white molding for visible connections, flush and clean connection around the holes.
Refrigeration route and connections
-
UV cellular nitrile insulated copper connections , minimal path with few bends to preserve charge and reduce pressure losses.
-
Communication/Power : shielded cable conforming to the manufacturer, waterproof external disconnection on dedicated circuit.
-
Waterproofing : all penetrations are treated with vapor barrier and compatible mastic to prevent condensation and air infiltration.
-
Condensate drain : continuous gradient gravity flow (>1%), integrated anti-siphon and evacuation test before closing the covers. When the configuration requires it, we provide a silent condensate pump ; here, gravity is sufficient and eliminates a maintenance point.
Commissioning: numerical checks and results
Our AirGreen protocol includes:
-
Nitrogen test and leak detection.
-
Deep vacuum < 500 microns, stabilization, then opening of the valves.
-
Check currents/voltages , check superheat & subcooling against the Fujitsu panel.
-
Air conditioning blower test : measurement with an infrared thermometer at the blower outlet. An instant reading of approximately 13–14°C indicates a compliant ΔT and efficient heat exchange under daytime conditions.
-
Switch to heating to validate the rise ramp and defrosting on the condenser side.
These measures guarantee air quality , setpoint stability and compressor longevity.
External condenser: robust and silent
The R-32 condenser is installed on anti-vibration supports with standard clearances. Depending on the building's configuration, we prefer a location sheltered from gusts of wind (backyard, terrace, flat roof with raised section) to optimize defrosting . The connections are covered outside, mechanically fixed, and the defrost water outlet is located away from pedestrian crossings to avoid black ice.
Comfort and efficiency on a daily basis
-
In summer, dehumidification maintains comfortable humidity without overcooling, a major advantage in Montreal homes.
-
In mid-season and until moderate cold weather, the heat pump takes over from the baseboards, significantly reducing operating costs .
-
Inverter modulation limits temperature variations and nighttime noise.
Grants and support
High-efficiency wall-mounted heat pumps operating on R-32 and offering good low-temperature performance may be eligible for financial support in Quebec. We prepare technical files (equipment numbers, performance sheets, proof of installation) for our customers in Montreal, Laval, Longueuil, the North Shore and the South Shore .
Recommended HVAC maintenance
-
Filters : monthly rinsing during periods of use, complete drying before replacement.
-
Evaporator : seasonal gentle cleaning to maintain heat exchange.
-
Drain : visual check of flow and absence of odors, annual test.
-
Condenser : clearing grass/snow, gentle washing of the coil.
-
Annual AirGreen visit : electrical measurements, inspection of UV insulation, tightening checks, parameter updates.
Rigorous maintenance ensures silence , efficiency and maximum lifespan .
Pitfalls to avoid (AirGreen feedback)
-
Placing the head too close to the ceiling reduces air intake and efficiency.
-
Oversizing the capacity causes short cycles and acoustic discomfort.
-
Tight elbows and excessive lengths impair performance; respect manufacturer limits.
-
Neglecting the slope of the drain can lead to visible seepage in traffic areas.
-
Forgetting the dedicated external disconnection complicates future interventions.
Deadlines and coordination
In occupied housing, a single-zone installation like this is generally completed in one day , including instrumented commissioning and user briefing: seasonal adjustments, energy optimization, filter maintenance.
Why AirGreen for your project in Montreal and the surrounding area?
At AirGreen, we combine precise sizing , impeccable HVAC installation and turnkey service : thermal study, careful installation, documentation for subsidies , then HVAC maintenance . This Fujitsu Orion XLTH (R-32) project in Villeray–Saint-Michel–Parc-Extension illustrates our requirement: an ideally placed interior head, a secure drain, clean connections and performance verified by thermometer upon commissioning.
Are you considering a Fujitsu wall-mounted heat pump? Our team covers Montreal , Laval , Longueuil , the North Shore and the South Shore with installations designed for the Quebec climate and daily comfort.