Milivolt Systems w/ Modern Thermostats
Jesse Grandbois is one of the techs who reads the tech tips wrote a few tips that he wanted to share on some gas furnace control basics. This tip is about how to use a fancy digital stat on a millivolt system
On a call for heat the relay coil will be powered closing the SPST relay powering the millivolt system (NO terminals) for heat.
Bryan Orr is a lifelong learner, proud technician and advocate for the HVAC/R Trade