Just about done getting the boiler all connected, just need to figure out the thermostat. I have a honeywell aquastat on the boiler that will control the fans and auto damper's on the boiler to keep the water temp where I want it. In my house I have two basic digital thermostats that are installed right next to each other. A previous owner had a pellet stove that was controlled by the second thermostat. The thermostat that is currently connected controls both my propane furnace and my central air. Is there a way to wire the currently connected thermostat to the one right next to it that is currently not connected to anything? My thought is that this disconnected thermostat (which is a heat only 2 wire model) can be our primary heat control, which will turn on just the furnace fan to maintain temp while the boiler is running, and the thermostat that is connected to our propane furnace and AC will then function as backup with the temp being set lower so it kicks on the propane if the fire goes out or something.
I think this is a fairly common setup. So where do I connect the two wires from the currently disconnected thermostat?
Second part of this is that I have a pressurized system, so I understand I should put a strap on aquastat in the house so it can monitor the incoming water temp. It would then turn on the furnace blower if the water is over a set temp such as 200 degrees or so to dump the excess heat. Anybody have any idea how that would be wired?
Thanks for any help you can offer.