The white gravel roof of a modern building, dark railings, and clear mechanical access: the ideal setting for an exemplary HVAC installation . Here, our team is deploying a Fujitsu Aquila R32 MultiZone heat pump , designed to provide four-season comfort to several homes in the Le Sud-Ouest (Griffintown) sector, while respecting the constraints of an urban roof exposed to the wind.
Two compact condensers, quiet multi-room comfort
The chosen solution combines two Fujitsu Aquila R32 MultiZone outdoor units powering several indoor heads. This architecture distributes the load between living areas and bedrooms, with inverter modulation to continuously adjust the power. The result: a stable temperature, contained consumption and controlled noise levels, a major asset in a dense Montreal neighborhood.
Why Aquila R32 for this type of building?
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R-32 : higher seasonal efficiency and reduced global warming potential compared to previous generations.
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Low temperature operating range adapted to the climate of Greater Montreal.
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Compatibility with ENERGY STAR criteria depending on the configuration, facilitating access to assistance programs applicable in Montreal , Laval , Longueuil , on the North Shore and the South Shore .
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Tropicalized electronic cards and intelligent defrosting, useful on a roof exposed to frost and wind.
Roof integration: stability, waterproofing, maintenance
The condensers rest on anti-vibration pads installed on crossbars, with insulating shims that distribute the load and protect the membrane. This installation reduces vibration transmission to the structure and secures the roof's watertightness.
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Power supply : Each unit has a waterproof disconnect switch accessible from the front, connected by rigid conduit and compressed cable gland. Circuit identification facilitates inspections and future interventions.
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Refrigeration path : The refrigeration lines are bundled, high-density insulated, and UV-sleeved; they terminate neatly in a metalized roof box that serves as the building's entry point. The hose clamps are UV- and frost-resistant.
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Clearances : respect the distances around and above the condensers to avoid air recirculation in heating mode and simplify defrosting.
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Wind management : the compactness of the frames and their orientation reduce the sail effect on the roof; the cables are secured to withstand gusts.
Key steps of our methodology
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Laser installation to ensure clearances between units, guardrails and technical outlets.
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Roof passage coring and finishing with flashing, elastomeric mastic and apron, for a lasting seal.
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Nitrogen bench and deep vacuum (< 500 microns) with stabilization; recording of values for the customer file.
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Commissioning : measurement of supply/return temperatures by zone, intensity reading, verification of superheating and subcooling .
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Finishing touches : beam alignment, UV protection, circuit labeling and delivery of a maintenance plan.
Interior distribution: custom multi-zones
Each dwelling or service area receives compact wall-mounted heads positioned to optimize airflow. The sleeping areas benefit from reduced speed and a directed shutter to limit drafts. The living rooms benefit from the dehumidification mode in summer, which is very relevant in a riverside environment.
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Condensates : gravity drains to internal downpipes when the configuration allows; otherwise, silent pumps with level detector, protected from access.
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Controls : Room-specific remote controls, eco-timer, and Wi-Fi option for time scenarios.
Results: measured performance and tangible comfort
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Stable temperature in summer and winter thanks to continuous modulation.
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Noise controlled on the roof and inside; no disturbance for the shared terraces.
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Neat aesthetics : grouped beams, aligned crosspieces, disconnectors at maintenance height.
Particularities of an urban roof and technical responses
UV exposure and freeze/thaw cycles
→ EPDM insulation + butyl tape on the fittings, capping and touch-up paint on sensitive parts.
Access limited by guardrails and hatches
→ Location close to maintenance paths, without obstructing roof drains; clearance left around outlets.
Multiplicity of zones
→ Balanced distribution of line lengths, optimization of diameters to respect refrigerant loads and maintain heat pump efficiency.
HVAC Maintenance: Recommended Schedule
To preserve the efficiency and longevity of the system in Greater Montreal:
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Spring : cleaning the external exchanger, checking the fins, tightening the connections, amperage test.
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Autumn : inspection of refrigeration bundles, checking of flashings and condition of pads, defrosting check.
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Interior : quarterly washing of filters, cleaning of head exchangers, calibration of remote controls.
AirGreen offers HVAC maintenance contracts tailored to condominiums and rental properties: planned visits, photo reports, budget recommendations.
Grants and Compliance
Depending on capacity, efficiency ratings and head configuration, the Aquila R32 range can meet the requirements of efficient heating assistance programs. We support applications for Montreal , Laval , Longueuil , the North Shore and the South Shore : technical data sheets, photos, proof of commissioning and serial information.
Best practices for a successful MultiZone project
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Plan, from the design stage, a grouped routing of lines and a dedicated roof box for maintenance.
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Respect a continuous slope of the condensates from the interior heads, with access to the service siphon.
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Maintain clearances higher than the manufacturer's minimums on the roof to avoid recirculation and facilitate snow removal.
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Document the commissioning measurements (pressures, temperatures, intensities) and file the file with the trustee.
At AirGreen, we size each MultiZone heat pump based on actual loads, permissible roof noise, and the building's maintenance plan. Whether you're in Montreal , Laval , Longueuil , on the North Shore or the South Shore , our expertise guarantees a durable, efficient, and easy-to-maintain HVAC installation .
Keywords worked on : heat pump , MultiZone heat pump , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore .