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Controlling zone valve with smart thermostat (wiring question)

andyrgardner
andyrgardner ✭
in General Questions & Topics
I have an extension kit connected to the boiler, Tado trvs on all radiators and one tado thermostat. They can all call for heat independently.

Now, I have a 5 wire zone valve that I want the thermostat to control. But I have no idea how to wire it?

Am I correct in thinking the thermostat can call for heat wirelessly and also be wired to signal the valve to open?

Answers

  • [Deleted User]
    [Deleted User] ✭✭✭

    Hello @andyrgardner,

    Please contact our technical support via the chat on our website by giving as much precision as possible so that they can correctly help you with your configuration. 

    Best regards,

    Your tado° Team

  • andyrgardner
    andyrgardner ✭

    Okay as I've now spoke to technical support and they don't know how it can be done... the question is back open!


    Technical support advised me to connect NO to Grey and COM to Orange.

    I've done that and connected blue and brown directly to the mains. The valve is normally closed, as soon as power is applied the valve opens and stays open.

    20200617_101122.jpg


  • Arth
    Arth ✭

    Did you ever manage to resolve this? I have a similar inquiry.

  • vmguru
    vmguru ✭

    Also want to know if you managed to use the Tado wall thermostat with your zone valve I believe this can be done.

  • vmguru
    vmguru ✭
    edited February 26

    (Normally Closed 2 Port Zone Valve)

    The Live, Neutral and Earth straightforward.

    This leaves Grey and Orange.

    Grey would the constant Live and Orange Switched Live

    When Tado calls for heat then NO and COM bridge together to OPEN 2 port zone valve.

    When Tado OFF (no call for heat) then NO and COM is not bridging, 2 port zone valve CLOSED

    This is what I think however I could be wrong?

    image.png
  • vmguru
    vmguru ✭

    Thinking about this again, I think the above is wrong and this is how it should be wired.

    Live to COM

    NO to Brown on zone valve

    Neutral Blue to Blue on zone value

    Green/Yellow Earth on zone valve

    When Tado thermostat calls for heat NO & COM sends power to Brown which OPENS zone valve

    image.png
  • fuel__2001
    fuel__2001 ✭
    JWflame - John Ward on YouTube runs through various Y plan and S plan zone valve setups with excellent schematics that explain things very simply.

    I managed to wire in 3 zone valves onto my combi boiler thanks to his videos.
  • policywonk
    policywonk Volunteer Moderator
    edited March 2
    @vmguru do you have a combi boiler? If not, do your have a three port valve, or two x two-port valves?

    That wiring you presented is only right in some circumstances, but not all. There is a convention in the UK for handling zone valves which we need to stick to or we fail to meet building regs.

    Are you fitting the zone valves and wiring yourself? Or are they already in place and you need help replacing an existing thermostat?

    Come back. Will help.

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