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Tying together 3 hydronic zones to be switched by one thermostat

We have a small house we recently purchased and there are three zones upstairs (and one in the basement). I installed an Ecobee thermostat on the main upstairs zone. There are two other 'dumb' thermostats upstairs. I'd like to tie together all three upstairs zones so that when the Ecobee calls for heat it opens the valves for all three upstairs zones.

My boiler uses a Taco ZVC 404 controller.


Can I just tie together in parallel the sets of T/T wires like this?


Thanks in advance for any assistance / recommendations.

Jon



Comments

  • Ironman
    Ironman Member Posts: 6,868
    edited December 2018
    That should do it. Does the Eccobee have a "C", (common wire) connection?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • jonwb
    jonwb Member Posts: 3
    Thxs! Yes, the Ecobee req's a C wire
  • hot_rod
    hot_rod Member Posts: 16,301
    what type of zone valves? High current draw ZVs may not be covered by the stat switching ability. Unless stat is isolated in that relay box. Some do, some don’t
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • jonwb
    jonwb Member Posts: 3
    hot rod_7 said:

    what type of zone valves? High current draw ZVs may not be covered by the stat switching ability. Unless stat is isolated in that relay box. Some do, some don’t

    To get my c-wire I followed the directions for option 3 here:
    https://support.ecobee.com/hc/en-us/articles/227874667


    I don't have the model number, but I have a 4-wire Taco Zone Valve (qty 4 (one for each zone)). I'm thinking that the controller 'handles' the current draw from the valves, but I'm not sure.