An AirGreen intervention on a high-rise HVAC system
When a Rosemont customer contacted us about an LG wall-mounted heat pump that was no longer heating efficiently, our team immediately scheduled a visit. Installed on the exterior wall of a second-floor apartment, the outdoor unit was showing signs of poor performance and excessive vibration .
At AirGreen , we understand that an HVAC system installed at height requires special precautions. Restricted access, the risk of compressor freezing, and pressure fluctuations related to the length of the piping can quickly lead to failures if the system is not properly maintained.
Diagnosis: loss of thermal efficiency and abnormal vibrations
On site, our technicians began by checking the R-410A refrigerant pressure , the compressor discharge temperature , and the fan speed . From the first measurements, we noticed an abnormal overpressure in the circuit, accompanied by a metallic vibration noise during operation.
A visual inspection revealed:
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an accumulation of dust and grease on the external exchanger,
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a loose wall bracket attachment ,
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and a slight oil leak around the liquid line fitting.
These three factors combined explained the lack of performance and noise observed by the customer.
Complete repair and refurbishment
Our team undertook a complete intervention :
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Complete cleaning of the condenser using a biodegradable product to restore heat transfer.
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Tightening and realignment of the wall bracket , followed by a load test to ensure structural stability.
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Nitrogen leak detection : The leak was caused by an improperly tightened flare fitting . We recrimped, tightened the connection, and replaced the sealing ring.
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Deep vacuum to remove all traces of moisture.
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Complete recharge with R-410A refrigerant according to LG Dual Inverter manufacturer's specifications.
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Final system test under different temperature loads.
After 20 minutes of operation, pressures and temperatures stabilized at nominal values, confirming optimal performance.
Result: restored performance and increased stability
Thanks to this intervention, the LG Dual Inverter heat pump has regained its original energy efficiency . The vibration noise has completely disappeared, the wall bracket is now securely fixed, and the heat diffusion inside the home has become rapid and uniform again.
The client also noticed a notable reduction in perceived noise inside , a sign that the exterior structure was no longer in resonance with the building wall.
Recommended preventive maintenance
We advised the client to have annual preventive maintenance , which is essential for:
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check the pressures and cleanliness of the condenser,
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prevent corrosion of exposed fittings,
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and ensure a solid fixation despite the freeze/thaw cycles of Montreal winter.
LG wall units are known for their efficiency, but like any HVAC system exposed to the elements, they require periodic inspection to prevent leaks and vibration imbalances.
AirGreen Expertise: Safety and precision in working at height
Repairs to facades or balconies require careful coordination , both for safety and quality of work. Our technicians are trained to work in these specific conditions, respecting safety standards and LG protocols .
At AirGreen , we combine technical expertise, modern diagnostic equipment and rigorous adherence to procedures to offer each client a lasting and professional solution, whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore .
In conclusion
This LG wall-mounted heat pump repair in Rosemont perfectly illustrates our approach: rigor, precision, and commitment to the long-lasting performance of HVAC systems. By restoring the system's mechanical stability and thermal efficiency, we ensured our client optimal comfort for seasons to come .