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Baxi Argenta 32 and Nest Gen3

Discussion in 'Plumbing and Central Heating' started by Colin Cooper, 11 Nov 2019.

  1. Colin Cooper

    Colin Cooper

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    Hi all,
    I have been trawling the internet trying to get some information on how to connect a nest to my new boiler, i live in Spain and the instructions for the boiler don't seem to be available in English... Baxi didn't either bother to reply!
    as i understand it the Baxi have the usense ubit that connects via the R-BUS plug, so i tried that... doesn't seem to do anything :(
    i have addad a couple of pics and would be very gratefull if their is anyone that can help me out here.
    Many thanks
    Colin IMG_20191111_154717792.jpg IMG_20191111_154711496.jpg
     
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  3. ianmcd

    ianmcd

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    sorry your post is very confusing what are you actually asking ? are you trying to wire the nest up to the R-bus on your boiler ? that wont work you need to wire it to the Tout
     
  4. Colin Cooper

    Colin Cooper

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    Hi Ian, hehe... it does read a bit confusing i admit! sorry for that.
    I'm trying to get my nest working, and just got a bit confused where to connect it to..
    ok, so two wires from the Tout plug, where would they go into the heatlink? 2&3 i'm guessing?
     
  5. Colin Cooper

    Colin Cooper

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    Hi Ian, leading on, connected already to the Tout is an outside thermostat, i'm guessing some sort of safety device so the boiler doesn't get to cold?
    if i disconnect this and attach the nest, i get a red error message saying "outside temp closed"?
    Colin
     
  6. ianmcd

    ianmcd

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    That is a weather compensation sensor so connect that back the way it was, what thermostat do you currently have ? sensor
     
  7. Colin Cooper

    Colin Cooper

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    nothing, its a new install... so i purchased the Nest Gen3
    Colin
     
  8. ianmcd

    ianmcd

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    Do you have underfloor heating by any chance ?
     
  9. ianmcd

    ianmcd

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    I like a challenge and now know that you have an oil condensing boiler, try connecting the R-bus terminals to the OT terminals in the nest
     
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  11. Colin Cooper

    Colin Cooper

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    no underfloor, yep its a new oil fired boiler... ok, i will try that
    Thanks
    Colin
     
  12. ianmcd

    ianmcd

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    if you dont have any external control , where do the two wires in the R-Bus go to ?
     
  13. Colin Cooper

    Colin Cooper

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    I have tried them into 2&3 and now to the OT terminals ... With no luck :(
    I do know that the RBus is the direct connection for the baxi usense smart controller, so I thought that it was probably the connection, boiler end for the nest...
     
  14. ianmcd

    ianmcd

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    I cant see it in your pics, is there a terminal X3 on the pcb ? can you send me a pic of that please
     
  15. Colin Cooper

    Colin Cooper

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    Hi, yes there is, its a 3 pin connector port... one of which has an earth symbol and the other two are blank.... not at my house at the minute, but i know thats there as i have looked at it.
     
  16. ianmcd

    ianmcd

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    That is where you need to wire the Nest into but you will have to do more probably insert a link somewhere, send me a pic when you get home and I will try and work it out for you
     
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  17. Colin Cooper

    Colin Cooper

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    Hi Ian, Ok thats starting to make more sense now, ... this is a pic of the whole PCB
    your help is very much appreciated :)
    Colin
     

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