I have a 2 stage thermostat in which I would like to set my corn/pellet stove as my first stage and the furnace as my second stage heating. The reason: I currently have 2 thermostats and have to adjust them both seperately and keep the difference the same. Often times the pellet stove stat gets turned down and not the furnace so the propane furnace runs, which is what I am trying to prevent. I basically need to convert the 24v to millivolt before the pellet stove. The RH (the 24v power) terminal is shared between the 2 heat sources/stage. The 2nd stage-the furnace is basic furnace thermostat wiring with the white going to w2 for the 2nd stage and the RH for 24v power. But for the 1st stage I dont want that 24v from the RH going to pellet stove, and the white from the pellet stove goes to W on the thermostat. From what I understand W is isolated from the 24v power so the Rh to W contact will start the corn stove. So how can I convert the 24v rh wire to millivolt before the pellet stove. I heard some use a spst relayto accomplish this?? Can anyone expand on that. What relay would work for this application and how do you wire it up. Thanks, Note: From what I've read if I can remove the 24v from this circuit it will not activate the furnace fan since the 24v is not present.

Hi everyone, I recently bought my house and we were told that we have an 'unconventional' heating system by both the previous owners and our home inspector when we bought the house. Our primary heat system is our Heat Pump, however, we have a gas auxiliary/emergency heat. The previous owner and the home inspector both said to use the emergency heat whenever it got below 30 degrees or so as it was more efficient than the heat pump (being that it's gas). I recently bought a Honeywell Prestige 2.0 to replace the original 30 year old thermostat. That being said, I installed the thermostat with my father and when we got to wiring the Emergency Heat (black) wire, we weren't sure what to do with the black wire, so we decided to just cap it off until we could figure out where to put it. Now that it's rather cold here in Maryland (20 degrees or so), I'm wondering where I need to put the wire and how I could configure the thermostat to work with the different setup that we have. According to the manual, the 'L/A terminal sends continuous output when thermostat is set to EM HEAT mode, except when setup for Economizer or TOD. See Economizer wiring section.' I do not own the Economizer, so I tried connecting the black wire to the L/A terminal and set the Thermostat to "Emergency Heat" -- the problem with this is that it doesn't seem to care about the Heat Setpoint and just runs all of the time, regardless of the temperature. I've included pictures of the old thermostat's wiring as well as the new thermostat's wiring. Is there a way to wire this (maybe wire white and black wires together in together?) for me to be able to use the Emergency Heat/Gas backup when it's below 30 degrees, but use the Heat Pump above this? I don't mind manually switching to EM HEAT on the thermostat, but the thermostat isn't working/shutting it off. Old: [URL="http://imageshack.us/photo/my-images/21/imageeeh.jpg/"][IMG]http://imageshack.us/a/img21/4065/imageeeh.th.jpg[/IMG][/URL] New: [URL="http://imageshack.us/photo/my-images/843/imagedaey.jpg/"][IMG]http://imageshack.us/a/img843/6209/imagedaey.th.jpg[/IMG][/URL] Thank you in advance! Chris