Trying to understand, a bit, about how these components "play" together.
Have a typical forced hot water home system; gas fired.
Was wondering about the Honeywell Thermostat I now have for it. It's a RTH 5100B 1009
Two wires, only, going from unit to the furnace control box on the furnace's side.
Pretty basic, and probably dumb, questions, but if anyone could help me out in understanding this would be most appreciative.
a. I guess that the sole output of the thermostat unit when calling for heat is to simply close a single pair of contacts. True ?
b. If so, does it have a "small" mechanical relay inside ? Or does it use a solid-state closure ?
c. And, that the 24 V dc is provided, probably, by a transformer in the Honeywell control box mounted on the side of the furnace, and Not by the Thermostat ? True ?
Thanks for help, R.