Installing Nest 3rd Gen

    Hello. I bought the 3rd Gen Nest on Friday, just looking to install the heat link and upon taking my old controller off, found this:…iXm

    It's a Logic 15, regular, condensing boiler with hot water cylinder.

    I'm a complete novice with this kind of stuff, could anyone kindly help me with wiring up the nest heat link?



    I fitted mine a couple of weeks back, its pretty simple really, i ended up removing my old programmer and wiring altogether and wiring the heatlink up to to the junction box by the boiler.

    on the rear of the programmer should be a diagram that shows what it what, that's the best place to start

    Original Poster

    My junction box is upstairs with the water cylinder, so wasn't sure if installing it there would cause problems with connectivity.

    Original Poster

    Thanks Jizzer. Might sound stupid but why are there 3 live cables and how would I know which one to connect to the new terminal?

    connect all 3 to the live terminal on the heat link.......they will link out to other devices on the heating system

    same with neutrals N
    Edited by: "jizzer" 28th Nov 2016

    What controller is it ...any markings on front or rear of old controller

    Original Poster

    ah okay, it's a danfoss controller.

    How did you get on, as I'm looking to change from a wireless danfoss

    Original Poster

    Haven't had a chance to do it yet, hoping to have a go today, I've been getting some advice on the diynot forum, I'll link to it later on as it might be useful to you too.
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