Performance diagnosis: air less cold than expected
At AirGreen , we were contacted by a Sainte-Julie customer concerned about the reduced performance of their Zephyr wall-mounted air conditioner . Despite regular maintenance, the unit was no longer producing air cool enough to maintain the desired indoor temperature. One of our certified technicians was dispatched to the site to perform a complete diagnosis of the HVAC system .
Step 1: Measuring the blowing temperature
The first step was to measure the temperature of the blown air using a precision infrared thermometer . The reading was 11.2°C , while the ambient temperature was around 20°C . This discrepancy, although indicating minimal compressor operation, suggested a partially reduced efficiency of the unit.
Our technicians know that for a Zephyr wall-mounted air conditioner in good condition, the difference between the suction and discharge temperatures should normally exceed 10 to 12 °C . In this specific case, the difference was at the acceptable limit - a sign of a weakened refrigerant level or internal fouling .
Step 2: Checking the refrigeration circuit
After turning off the power and securing the workstation, we carried out an inspection of the refrigeration circuit . A slight trace of oil around the flare connection of the external compressor confirmed a micro-leak of refrigerant .
We then have:
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performed a nitrogen leak test at 350 psi;
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detected the leak using an electronic detector ;
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replaced and tightened the flare fitting ;
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then recharged the system with R410A refrigerant according to the nominal quantity from the manufacturer Zephyr.
Step 3: Cleaning and Recalibration
Before restarting the system, the internal filter and evaporator were cleaned with a biodegradable product to remove accumulated dust. The tangential fan was also balanced to reduce vibration and noise.
Once the circuit was recharged, the technician took another measurement: 6.8°C at the outlet , an efficiency gain of almost 40% . The air conditioner returned to optimal performance , ensuring constant comfort in the main room.
Step 4: Preventive Maintenance Tips
As always, our team took the time to explain to the customer some simple practices to extend the life of their device:
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clean the air filter every four weeks during the summer season;
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keep the outdoor condenser clear of any obstacles;
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schedule an annual professional interview before each summer.
Final result
Thanks to a quick and methodical intervention, the Zephyr wall-mounted heat pump was able to regain its full efficiency. The customer immediately noticed the difference: cool, quiet, and stable air, even in the heat.
At AirGreen , we combine precise diagnosis , careful repair and local expertise to ensure the comfort of our customers in Montreal, Laval, Longueuil, the North Shore and the South Shore .