In HVAC, you will hear the word “flux” used in two totally different parts of the trade. Magnetic flux is the lines of force that emanate from a magnet, and you often hear about magnetic flux lines in discussions of motor theory. This type of flux has nothing to do with that… Flux in soldering, […]

First, a thermocouple is not a flame rectifier like a modern flame sensor. A thermocouple actually generates a millivolt potential difference when it is heated by a flame—just to get that out of the way for any of you newer techs who are used to modern flame sensors. With higher efficiency gas-fired equipment being the […]

This article was written by Senior Refrigeration tech Jeremy Smith. Big thanks to Jeremy for his contributions to HVAC School and the tech community. Having spent many years in the trade and many years reading posts from techs on forums and social media, a big issue that I see is that troubleshooting is something of […]