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I have two Trane XR95s, with separate thermostats (main-level and upstairs). I have two Ecobee3s that I thought would be an easy install, although I do need to use the PEK.
However, I opened up the furnaces and they seem semi-twinned? Not actually twinned, I assume, because each one has it's own thermostat, but the C (red)/Y (white) in this one:
Is, AFAICT, hooked up to the C (write)/TWIN (red) on this one:
And so the furnace with the TWIN wired up has what I assume is the Y wire also wired into the TWIN terminal, so I couldn't go through the PEK instructions, which assume a normal Y wire.
I had already scheduled a tech to come by later this week and do annual maintenance + check my work, thinking I'd have it installed by then, but now I'm going to hold off.
However, I'm curious, just so that I know more when the tech comes out, is there an obvious reason why my furnaces would be connected like this? Can I setup two ecobees/PEKs with this wiring?
Apologies if I should submit this to Ecobee support instead; just let me know if that's a better avenue for questions like this.