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Did you get an answer on this? I am doing the same set up. I have learned several things. I tried wiring a second thormostat across the pwr and fan terminals. From red to green thinking the original...

I am doing the same set up. Forced hot air (nat'l gas) and central boiler. I connected a second thermostat in series w/ the Auto/On switch and left the switch in the ON posistion. I found out that...