Precision technical intervention on a complex HVAC system
When a high-end HVAC system experiences a breakdown, a methodical and expert approach is required. At AirGreen , we were recently called to Boucherville , on the South Shore of Montreal , to diagnose a Trane central heat pump that was no longer able to maintain the desired temperature in the residence.
The customer noticed that the outdoor compressor was running intermittently, while the indoor air remained lukewarm. A classic case of a refrigerant problem... but one that required a thorough check.
Step 1: Initial inspection and initial findings
Upon our arrival, we undertook a complete visual inspection of the system:
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Trane outdoor unit : cover open, side panel removed, signs of recent maintenance but oily fittings — a possible indicator of microleaks.
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Titan Smart indoor unit : located in a well-ventilated mechanical room, feeding a complete network of central ducts.
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Initial pressure measurement using our digital manifold: inconsistent values — suction pressure too low and discharge pressure unstable.
These elements confirmed our hypothesis of an insufficient refrigerant level , probably caused by a slow leak.
Step 2: Leak Test and Leak Location
We then carried out a leak detection test in several stages:
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Injection of pressurized nitrogen into the refrigeration circuit.
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Observation of pressure drop over a 15-minute period: measured loss of 12 psi.
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Electronic detector inspection (sniffer): positive detection around the Schrader connection on the low pressure side .
The leak was from a failed seal at the service port , a subtle failure but enough to impair the compressor's performance.
Step 3: Repair and Recharge the System
Once the leak is located:
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We replaced the Schrader seal and thoroughly cleaned the valve seat.
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The system was then placed under deep vacuum at -500 microns to remove all traces of moisture.
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A new charge of R-410A refrigerant was injected according to Trane specifications, precisely measured using an electronic scale.
The final measurements showed:
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Suction pressure: 118 psi
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Discharge pressure: 365 psi
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Overheating: 10°F
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Subcooling: 9°F
Values perfectly in line with Trane standards for this model.
Step 4: Performance testing and calibration
After recharging, we checked:
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The temperature of the air blown into the ducts (outlet at 9°C in air conditioning mode).
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The compressor performance is stable and quiet.
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Automatic defrosting , operating normally.
We also reset the Titan Smart control module , synchronized with the Trane heat pump, to ensure perfect communication between the two devices.
Step 5: Recommendations to the client
In order to avoid any recurrence, we have recommended:
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An annual check of the refrigerant charge before the summer season.
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A check of pressures and temperatures at the start of each seasonal cycle.
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Installation of a reinforced protective cap on the service ports to prevent moisture infiltration.
These simple measures significantly extend the life of an HVAC system and maintain its energy efficiency.
Result: restored performance, regained comfort
By the end of the project, the heat pump was operating at full capacity. The client immediately noticed the difference: cool, consistent air circulated throughout the house, with no temperature fluctuations.
This intervention in Boucherville perfectly illustrates the AirGreen method: rigorous analysis, precise repair and lasting optimization .
Our team is fully proficient in Trane, Midea, Lennox, Fujitsu, Gree systems and other recognized brands , offering reliable and professional service throughout Greater Montreal , from Laval to the North Shore and Longueuil to the South Shore .
In summary
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Problem : Slow leak at service port causing loss of refrigerant.
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Solution : Replace the Schrader seal, vacuum and fully recharge.
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Result : balanced pressures, optimal performance and immediate comfort.
At AirGreen , we believe that a well-maintained heat pump is the key to long-lasting, energy-efficient comfort, summer and winter.