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Replacing Basic Dial Room Thermostat with Digital

Discussion in 'Electrics UK' started by TCUK75, 20 Jan 2016.

  1. TCUK75

    TCUK75

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    Hi,

    I've done some research on this question, looked at the wiki etc however I'm still not 100% clear on this and obviously don't want to risk damaging something so would really appreciate some help/guidance with this.

    I'm replacing this;
    upload_2016-1-20_11-40-17.png

    Which has;
    Yellow/Green - Earth
    Black - Switch?
    Brown - Live
    Grey - ? Not currently connected

    With a Home Expert Digital THR840DUK;
    upload_2016-1-20_11-36-5.png

    I think I just need to connect Black to A and Brown to B. And I can ignore Earth as this doesn't need to be connected? What's the grey wire please?

    Would really appreciate some guidance on this from you.

    Cheers
     

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  2. EFLImpudence

    EFLImpudence

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    No, the other way round - assuming brown is live which is likely.
    It doesn't actually make any difference in this case but it would if anything were connected to C so just as well do it right.

    Yes, position safely out of the way.

    Depends what it's connected to at the other end.
    Maybe nothing - but could be used for something if ever needed.
     
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  4. Taylortwocities

    Taylortwocities

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    Insulate the grey wire by putting it into a bit of choc block. Better than let it wave around and maybe touch something. It may be connected to something at the business end.
     
  5. TCUK75

    TCUK75

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    Perfect!

    Thanks very much for the advice.
     
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