I'm weeks into this open issue ... can anyone provide a recommendation? I have two t-stats. 1 handles 1 heating zone and my AC and I've installed an ECOBEE3 WIFI t-stat there and everything has been perfect. On my second zone (boiler heat only) ... I've attempted to install a second ECOBEE3. I don't have a common wire ... so included in the wiring is the addition of a FAST-STAT unit. I've been in numerous contacts with ECOBEE help desk and even called FAST-STAT -- but I can't get the zone value to work (I have manually confirmed that the heat works on the zone valve). I can't get ECOBEE support and FAST-STAT to agree with where the FAST-STAT should be wired (one says at the zone value - the other at the boiler). I've tried both ... neither have worked. I have a Honeywell circulator board with TV, T, W and Z wiring ports. And I have TACO zone values with 3 wiring connections. Can anyone provide guidance on how to connect the FAST-STAT receiver at the boiler/zone valve side (the sender at the t-stat appears to be straight forward).
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