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Baxi and nest

Discussion in 'Plumbing and Central Heating' started by jjbur, 12 Nov 2019.

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  1. jjbur

    jjbur

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    Hi all
    New to the forum and looking for a little help I have a baxi duo tec he and I want to install a nest thermostat gen 3 at the moment I have a baxi multifit wireless programmer fitted do I need to disconnect this before the nest is installed and if so do I link the two wires that go into the wireless sender together and leave the L and N terminated then remove the link wire from the connection terminal to fit the two wires from the nest.
    Any help would be much appreciated
     
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  3. ianmcd

    ianmcd

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    Your post makes absolutely no sense, post pics of what you have and what you want to replace it with
     
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  4. stem

    stem

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    If you carry out a search using the box in the top right hand corner of this page, and enter

    baxi duo tec nest

    You will find posts dealing with fitting a Nest to a Baxi Duo Tec. That should give you some idea of what's involved and then if you have any additional specific questions post back.
     
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  5. jjbur

    jjbur

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    To make it more easy to understand I have a baxi duo tec he boiler that has a wireless programmer fitted do I need to remove the receiver from the boiler before fitting a new nest gen 3 thermostat I have tried the search above and have found no reference to the info I am after
     
  6. stem

    stem

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    You can't have two thermostats trying to do the same job. One will interfere with the other.
     
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  8. jjbur

    jjbur

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    Hi Stem
    thanks for your reply. If I remove the receiver should I connect the nest heat link into these connections or should it be connected into the main terminal block these photos are not my actual boiler the main terminal block on mine still has the link fitted in 1 and 2 and the receiver is still fitted to the cables in picture 2 boiler-wiring.jpg 20773649.jpg
     
  9. stem

    stem

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    First of all I have a suspicion that with your model of boiler that to access the wiring terminals you might have to open up a room sealed section of the boiler to access them. If you do, then this is not a DIY job and should only be done by an RGI (Gas Safe) engineer who can carry out the necessary safety checks afterwards to make sure that it is sealed up properly again. But I might be wrong on this as I can't remember the details of every model of boiler!

    Secondly, as you mention, the photo's you have posted which are not from your boiler, won't represent what you have because they are from a boiler that doesn't have an internal receiver fitted, and has external remote controls installed already to boiler terminals 1 & 2.

    Having said that, if the wiring terminals are accessible without opening up a sealed part of the boiler, then the Heat link connects to the terminals below.

    Capture.JPG

    The mains supply for the Nest Heat link goes into the boiler L N & Earth terminals along with the existing wires already there.

    Remove the link between boiler terminals 1 & 2

    Nest (2) 'heating common' goes to boiler terminal 2

    Nest (3) 'heating call for heat' goes to boiler terminal 1

    Regarding the other photo, that is a 3 way block that is fitted when there isn't a remote receiver attached. When there is a receiver, the wires in that connector would go to the receiver. So to remove the receiver it is necessary to replicate what is shown below. The 2 black wires are connected together, and the brown and blue wires insulated / isolated separately.

    Capture1.JPG
     
  10. muggles

    muggles

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    Tbe Duotec is fine for DIY electrics @stem
     
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  11. stem

    stem

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    Ah excellent thanks @muggles. jjbur you can ignore that bit of my post (y)
     
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  12. jjbur

    jjbur

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    Thanks for the help and info guys very much appreciated thanks Muggles for your input as that was to be my next question.(y)(y)
     
  13. DIYnot Local

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