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Replacing Honeywell BDR91 receiver with Tado Extension Kit

Discussion in 'Plumbing and Central Heating' started by WMD, 7 Dec 2019.

  1. WMD

    WMD

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    Hi,

    I am looking to replace my Honeywell BDR91 receiver with a Tado Extension Kit.

    I got the installation instructions from Tado - but when I opened up the BDR91, the wiring isn't exactly as I was expecting.

    There are 2 black wires to N.
    There are 2 brown wires to L.

    I believe this is due to the fused switch that is connected to the BDR91 - and the BDR91 being connected to the Vaillant ecoTec Pro 28 boiler.

    The Tado instructions are telling me to remove the grey wire connecting L to A (remove the bridge).

    The grey wire currently going to B will go to 4 on the Tado Extension Kit.

    I've uploaded a pic of the current BDR91 wiring - a pic of BDR91/Tado Extension Kit labelling - and a pic of the final wiring of the Tado Extension Kit.

    I'm assuming that the 2 black wires currently in N will both get connected to the Tado Extension Kit N.

    I'm assuming that the 2 brown wires currently in L will both get connected to the Tado Extension Kit L.

    Wire 2/C in the Tado instructions are not being used for this installation.

    I just want to make sure I'm not going to mess anything up!

    Thanks!

    WMD
     

    Attached Files:

    Last edited: 7 Dec 2019
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  3. CBW

    CBW

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    You have x2 browns in L, x2 blacks to N, a link wire and a switched. Tado instructions appear similar, a link wire between L and A
     
  4. WMD

    WMD

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    Thanks Novice. I have edited my post to correct my mistake.

    Yes - I was pretty sure the diagram showing the link/bridge was my current setup for the BDR91.

    I'll be removing the link wire completely - as it is not used in the Tado Extension Kit.

    The way I understand it - the B wire is the switched. This wire will connect to 4 in the Tado Extension Kit.

    I will connect both black wires in N, to the N in the Tado Extension Kit.

    I will connect both brown wires in L, to the L in the Tado Extension Kit.
     
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  5. DIYnot Local

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