An intervention on a residential brick facade
Our AirGreen team was recently called to Town of Mount Royal , in the heart of Montreal, for a service call regarding two Haier wall-mounted air conditioners installed side by side on the facade of a multi-story residential building. The units, mounted on wall brackets, were exposed to repeated freeze-thaw cycles, an often underestimated factor in the long-term performance of HVAC systems.
The customer, a duplex owner, had noticed a gradual decrease in cooling capacity and a metallic vibrating noise coming from one of the compressors.
Complete and methodical diagnosis
Before any intervention, our certified technicians carried out a series of tests and checks on the two outdoor units:
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Visual inspection : dust accumulation, slight traces of corrosion on screws and metal support.
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Electrical test : Check voltage and continuity on the compressor and control board.
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Refrigeration pressure check : detection of a slight refrigerant undercharge on one of the Haier units.
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Mechanical balance test : One of the fans had a slight misalignment of the shaft , causing the reported noise.
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Drainage observation : Condensate drainage was not optimal, causing intermittent backflows in the pipe.
This complete diagnosis made it possible to target three main sources of the problem: a mechanical imbalance , a minimal leak on the service connection , and a partially obstructed condensate flow .
Step by step repair
1. Stabilization and cleaning of units
Our technicians began by thoroughly cleaning the condenser, fins, and brackets, removing dust and oxidized aluminum deposits. The wall bracket was tightened and stabilized to eliminate any vibration transmitted to the brick wall structure.
2. Fixing the mechanical problem
The external fan was disassembled and realigned on its axis. A new anti-vibration rubber mount was installed, immediately reducing operating noise.
3. Repairing the microleak
Using an electronic leak detector , a small loss of refrigerant was identified at the discharge side flare connection . After purging and brazing, we performed a leak test under nitrogen at 350 psi, followed by a full vacuum (500 microns).
The unit was then recharged with R-410A refrigerant , according to Haier specifications.
4. Unclogging and readjusting the drain
The condensate drain was unblocked with compressed air, then repositioned with a more regular slope to ensure natural flow and avoid any accumulation of water.
5. Final tests and calibration
Once the system was reassembled, we ran a full performance test :
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Blowing temperature: 9.8°C after 10 minutes of operation.
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Measured sound level: 46 dB at 1 meter (compared to 59 dB before repair).
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Power consumption stabilized at 5.1 A.
Both Haier air conditioners have thus regained their optimal performance, offering the customer immediate comfort and improved energy efficiency.
AirGreen Recommendations for Sustainable Performance
To ensure the longevity of these two wall units, we advised the customer to perform annual preventive maintenance , including:
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Cleaning of internal coils and filters.
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Checking the refrigerant level.
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Testing the compressor and temperature sensors.
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Inspection of exterior wiring and supports.
Additionally, a winter inspection is recommended for this type of exposed wall installation, to prevent water infiltration and corrosion of the fasteners.
A typically Montreal intervention
This repair clearly illustrates the specific conditions encountered by HVAC systems in Town of Mount Royal and Greater Montreal :
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Significant temperature variations between seasons.
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Installations often mounted high on brick walls.
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A need for meticulous maintenance to preserve performance.
At AirGreen , we have a perfect understanding of these local constraints. Our technicians work daily in Montreal, Laval, Longueuil, on the North Shore and the South Shore , offering sustainable solutions adapted to each building, whether it is a duplex, a condo or a single-family home.
In conclusion
This Haier wall-mounted air conditioner repair in Ville Mont-Royal demonstrates AirGreen 's expertise in maintaining compact systems in urban environments. Thanks to a thorough diagnosis, precise intervention, and personalized customer service, we were able to restore these two units to their original efficiency and quietness—for optimal comfort, season after season.