A breakdown during operation in a professional space
At AirGreen , our services aren't limited to residential applications: we also repair specialized HVAC equipment in commercial and institutional environments. On this day, our team was called to Outremont , Montreal, for a breakdown of a mobile industrial dehumidifier , used in a care center to maintain stable air quality and controlled humidity levels.
The customer reported that the unit was no longer producing cool air and that a pressure alert was displayed on the control panel. The unit, equipped with a rotary compressor and a compact copper coil condenser , is a model designed for large volumes and operates on R-410A refrigerant .
Technical diagnosis: compressor and fluid circulation problem
Upon opening the lower casing, our technicians observed:
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Traces of refrigerant oil around the suction connection,
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Overpressure detected on the liquid line,
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And an overheated compressor that would go into safety mode after a few minutes.
Using our NAVAC digital manifold , we measured the pressures and confirmed a partial obstruction of the expansion capillary . This type of failure is common when moisture or metal particles enter the refrigeration circuit.
Steps of repair
1. Disassembly and inspection of the circuit
We carefully removed the side panel , then isolated the compressor , condenser and capillary .
The analysis identified a metal deposit in the capillary , probably due to internal micro-wear of the compressor.
2. Purging, cleaning and replacing the capillary
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Complete draining of R-410A refrigerant into a recovery tank.
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Cleaning the circuit with dry nitrogen to remove impurities.
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Replacement of the capillary and addition of a new filter drier on the liquid line.
3. Precise vacuuming and reloading
A 250 micron vacuum was applied to ensure a perfectly dry and contaminant-free system.
We then recharged the circuit to the manufacturer's exact specifications, respecting the nominal charge of 380g of R-410A .
4. Final performance check
After reboot:
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Suction pressure: 115 psi
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Discharge pressure: 360 psi
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Blowing temperature: 11.3°C
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Ambient humidity level: dropped from 64% to 47% in less than 30 minutes.
The system therefore returned to optimal and stable operation , without protection triggering.
Fast and methodical service from AirGreen
This type of service demonstrates our expertise in professional HVAC repair . With our advanced technical training and high-precision diagnostic equipment, we can service a variety of systems— dehumidifiers, air exchangers, heat pumps, and air conditioners —regardless of their complexity.
Our priorities remain:
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Safety of the intervention sites (here, a wooden floor requiring protection and stability of the tools),
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Accuracy of pressure and temperature measurements,
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Durability of the repair, by replacing sensitive parts with quality components.
Best practices for maintaining an industrial dehumidifier
To avoid this type of breakdown happening again, we recommend:
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To have fluid pressures checked once a year,
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To regularly clean the copper coils and the fan,
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Use clean air filters to prevent dust buildup on the condenser,
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Let the unit rest for 5 minutes before restarting after a power outage.
These simple actions extend the life of the compressor and optimize the energy efficiency of the device.
Conclusion: efficiency found in Outremont
Thanks to AirGreen 's rapid intervention, this industrial dehumidifier regained its full dehumidification and cooling capacity. The customer was able to resume operations in a healthy and stable environment, without prolonged interruption.
At AirGreen, we bring your HVAC equipment back to life—from the smallest wall-mounted air conditioner to the most complex industrial systems.