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You'll need a different zone board for this The bad news in your situation is that your existing zone board (assuming its the Honeywell/TrolATemp MM-2) is incompatible with the Ecobee, at least without parts to adapt it, because it relies on both O and B being available as separate signals from the thermostat, and one of them being energized at all times. ...


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Your idea probably won't work correctly to begin with Your proposed setup probably won't even work quite right, whether you use old-style mechanical thermostats or new-style "smart" thermostats. With two-pole mechanical 'stats (such as the Honeywell CT410B), only one pole is thermostatic as a general rule, with the other pole simply being a ...


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Your furnace has fan terminals, thankfully The good news is that your furnace has a fan (G) terminal and corresponding Rc and C terminals, found on the relay module depicted in your second photo. The bad news is that the combustion controller is totally separate from the fan relay in your setup, so you'll need to wire this a bit differently from a standard ...


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Just connect the spare wire to the C terminal depicted in Picture 4 According to your wiring diagram, what's depicted in Picture 4 should be the transformer/circulator-relay combination unit shown in the wiring diagram, which provides a handy-dandy 'C' (Common) terminal for you to connect your spare thermostat wire to. So, simply land the wire there, with ...


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Unfortunately, your old thermostat likely did not have power going to it, just sense lines that closed a circuit when the mercury switch attached to the thermostat closed. All of the "cool" new thermostats require power and a neutral line (so minimum 4 wires). Is there any way you can get power to the planned install location? they make 24V plug ...


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Comment, not an answer (but it might be): [I am new and won't let me 'comment' until '50' reputation; but it DOES let me 'answer', go figure...] Correct, it is a No-no to cross transformer supplies (at the R's). Most equipment now have one side of the 24VAC transformer physically attached to ground. This will lead to having both (or potentially 3, if AC has ...


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I had this same problem - hot air blasting from the vents with neither heat nor cool turned on. I had to break the wire to the fan switch and insert a SPST toggle switch in that circuit. I mounted the switch in the side of the furnace case and flip it off in the spring and on in the fall. The more elegant solution would be to insert some kind of thermostat ...


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I have almost the exact same setup as you (hydronic floor heat and air handler for backup heat) and mine works with one tstat just fine. So while you aren't asking for too much from "a" thermostat, you may be asking too much from "that" thermostat. I looked at the specs and didn't see anything about 2nd stage heat or aux heat, it might ...


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