Application Note: Resonix RGD
For decades, various HVAC systems have incorporated HFC refrigerants into their designs.
While effective in regulating heating and cooling across different spaces—and not harmful to the planet’s ozone layer—these refrigerants have a high global warming potential (GWP).
In many system designs, HFC refrigerants are being replaced by hydrofluoroolefins (HFOs), which have a significantly lower GWP. However, since HFOs are classified as slightly flammable (A2L category), UL regulations (specifically UL/IEC 60335-2-40) require the use of sensors to detect leaks and mitigation measures to prevent potential gas buildup.
In traditional split HVAC systems, the most likely area where A2L refrigerants could accumulate and require mitigation is near the evaporator coil at the base of a structure’s interior air handler.
Solution
The Sensata Resonix™ RGD sensor provides a best-in-class solution for addressing this challenging sensing environment.
Instead of relying on thermal conductivity or other conventional technologies, the sensor continuously monitors the acoustic resonance of the surrounding air. By constantly compensating for temperature and humidity, it can accurately detect the presence of A2L gases.
