Vokera & Nest The Electrical Saga...

Discussion in 'Plumbers' Talk' started by Hadventure, Aug 27, 2018.

  1. Hadventure

    Hadventure Member

    OK so my new house has a Vokera boiler and I have spent most of the morning looking at wiring diagrams and scouring the internet... There is very little on Vokera and Nest. (Sorry I realise this is Nest installation post number ten billion).

    I have removed my nest from the Veissmann boiler in my old place (I installed this - worked fine) and am trying to figure out the wiring for the heat link. At present I kind wish I had taken the boiler with the nest.

    I have the Vokera Vision 25C and its a Nest 3rd Gen.

    The wiring diagram is attached. I basically know where to get the Live and Neutral from. I am wondering where to wire the heating controls in... Essentially do I wire them into the M2 thermostat control on the diagram? Or the CN5?

    My options are CN5 as then I can leave the boilers inbuilt controls off or use them as an override... Or wire into M2 and set the boilers own built in controls to have the central heating constantly on... Have I got this right? Any advice would be greatly appreciated.

    Many thanks.

    PS Boiler instruction manual is here: https://www.vokera.co.uk/wp-content...C-User-Installation-and-Servicing-manual2.pdf

    Attached Files:

  2. furious_customer

    furious_customer Active Member

    Looks like the CN5 connector on the PCB has 2 blue wires - one of which runs to a terminal strip which is labelled M2? And a black wire completes the connection.

    So I think I would remove the black link and connect the volt-free contacts of the heatlink to these.

    Your thermostat is taking the place of the black-wire and will open/close the circuit as dictated by the nest device.
    Last edited: Aug 27, 2018
    Hadventure likes this.
  3. furious_customer

    furious_customer Active Member

    Like this :-

    Hadventure likes this.
  4. Hadventure

    Hadventure Member

    Thanks. I saw that too at M2. I’ll put it there and leave the inbuilt controller or constantly. Makes sense.
  5. furious_customer

    furious_customer Active Member

    I think this connector will be wired in series with the in-built controller, so yeah it will need to be set to permanently on.
  6. Hadventure

    Hadventure Member

    Furious your a hero. Thanks for taking the time to look into this for me.
  7. furious_customer

    furious_customer Active Member

    No problem, I had a similar issue when wiring my nest up to my vokera and ended up calling Vokera tech support.
    Got through to a local guy (Glasgow) who was very helpfull after initially being puzzled as to why I wanted to be able to switch my heating on from the pub.

    BTW, if you have an amazon alexa you can control the nest from it - works really well.
  8. Hadventure

    Hadventure Member

    Just as a quick update - wired it in (as above) and it all works great! Thanks again.
  9. Shari

    Shari New Member

    Hi guys,

    Just wondering if you can help me out with a similar issue to this. Got a Nest 3rd gen and a volkera excel 25 combi. Attached wiring diagram from the manufacturer.

    Issue is pretty similar to hadventure. I know where to put the L and N. Got a connector clock connected to the boiler so the L/N wiring is like for like. What I am getting confused about is where to put the red and black wires,from CN5, in the heatlink? Do they go into 2/3 connections in the heatlink?

    Taken some pics of the current setup.

    Thanks in advance for your help :)


    Attached Files:

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