Force Furnace Blower to Run on Separate Schedule to Circulate Air
You should be able to wire a thermostat to R, G, and C on the fan control relay and have it control the fan
According to the wiring diagram on your furnace, the fan relay selects between AUTO operation (where the blower thermostat in the plenum controls the fan) and always-on operation, so you should have no issues wiring your new thermostat to the R, G, and C terminals on the fan relay so that it can &quot;take over&quot; the fan if desired.