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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 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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This line: is the equivalent of the "C" terminal. Get it from here:


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