Technical intervention in an underground parking lot
At AirGreen , we are often called upon to intervene in unique situations—and this repair of a Fellini wall-mounted heat pump in Town of Mount Royal is a perfect example. The client, the owner of a modern condominium, contacted us after noticing that their HVAC system was no longer producing heat in heating mode , despite the normal operating noise of the outdoor unit installed in the building's underground garage .
Initial analysis and intervention constraints
Indoor parking facilities present specific challenges:
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Restricted ventilation , which can affect the heat transfer of the condenser.
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Excessive condensation in winter.
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Accumulation of fine dust from concrete and vehicles.
Upon our arrival, our technician carried out a series of preliminary checks:
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correct supply voltage (240 V);
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no error on the electronic card;
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operational outdoor fan;
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absence of frost or physical blockage.
However, the blowing temperature measured inside did not exceed 16°C , indicating a lack of compressor power .
In-depth diagnosis: refrigerant leak and compressor overheating
We connected our digital pressure gauges to analyze the pressures. The result: abnormally low low pressure and unstable high pressure , typical of a partial leak of R410A refrigerant .
A closer inspection revealed a micro-leak at the service connection of the Fellini condenser, aggravated by the constant vibrations caused by the metal suspension of the ceiling support.
Steps of repair
Our team undertook a complete and certified intervention :
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Draining and recovery of residual refrigerant in accordance with environmental standards.
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Repair of the defective connection by brazing and reinforcement of the weld.
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Cleaning the circuit with nitrogen gas to remove all traces of humidity.
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Extended leak test at 300 psi for 45 minutes to validate the correction.
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Complete system recharge with the refrigerant recommended by Fellini.
Each step was carried out with calibrated tools and cross-checks to ensure the sustainability of the intervention.
Results after repair
Once the system was restarted, the results were immediate:
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Balanced and stable pressures ;
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Indoor blowing temperature measured at 8.2°C in air conditioning mode (and 45°C in heating mode);
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Quiet and smooth compressor operation ;
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no excessive vibration on the suspended support.
The customer has thus regained optimal thermal comfort , and his Fellini heat pump now operates at full efficiency without loss of performance.
Maintenance tips for garage-installed systems
To extend the life of a similar installation, we recommend:
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to have the anti-vibration mounts inspected at least once a year;
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to clean the outdoor coil to prevent the accumulation of dust and concrete deposits;
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to perform a preventive leak test before each heating season;
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and check the ventilation of the room to ensure good heat exchange.
AirGreen: HVAC experts for all configurations in Montreal and beyond
At AirGreen , we work in all types of environments—whether private residences, condominiums, businesses, or apartment buildings . Our expertise covers all brands, including Fellini, Fujitsu, Midea, Gree, Sharp, Zephyr, Trane, and Goodman .
We serve all of Greater Montreal , including Town of Mount Royal , Laval , Longueuil , the South Shore and the North Shore . Our priority remains the same: to provide fast, reliable and professional HVAC service that guarantees comfort and peace of mind.