1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Wiring for Hive to replace Honeywell ST9400c and BDR91

Discussion in 'Plumbing and Central Heating' started by jw80, 23 Nov 2020.

  1. jw80

    jw80

    Joined:
    8 May 2012
    Messages:
    25
    Thanks Received:
    0
    Location:
    Worcestershire
    Country:
    United Kingdom
    Hi all

    I would like to replace my Honeywell with a Hive to control both the heating and hot water (tank) and I was after some advice on the wiring. The current set up is like this
    and then the BDR91 has a wireless link to a thermostat. How do I remove the BDR91 from the set up? And am I also right to say that on the ST9400c it's the following at the moment?
    1 - HW off
    2 - CH off (no used)
    3 - HW on
    4 - CH on

    Many thanks in advance
    Jamie
     
  2. stem

    stem

    Joined:
    20 Jul 2005
    Messages:
    6,741
    Thanks Received:
    1,595
    Location:
    Nottinghamshire
    Country:
    United Kingdom
    The ST900c and the Hive Dual Channel Receiver as you can see below, have exactly the same connections. So the existing wires in terminals N, L, 1, 3, & 4 move from the Honeywell to the Hive, like for like.

    hwell.jpg

    Regarding the BDR91:

    1. The wires from the BDR91 should be traced back from the thermostat to their origin. When you find their origin, the brown and blue wires from N & L should be disconnected and removed.

    2. Note where the two black wires from A and B originate from and then remove them also. At this point all of the wires going to the BRD91 will be disconnected, and the BDR can be removed.

    3. Now insert a wire link to join together the two terminals, where the two black wires you just removed came from so that the terminals are electrically connected.

    Or if that's too difficult, fix a junction box where the BRD91 is now, put the brown live wire in one terminal on its own, the blue neutral wire in a terminal on its own, and the two back wires in a third terminal together.
     
    Last edited: 23 Nov 2020
    • Thanks Thanks x 2
  3. Sponsored Links
  4. CBW

    CBW

    Joined:
    26 Sep 2019
    Messages:
    8,934
    Thanks Received:
    2,384
    Location:
    North
    Country:
    United Kingdom
    Hi Jamie,

    That BDR looks like it’s near the programmer, so to remove should be straightforward, then copy the wiring configuration over.

    Edit: Stem beat me to it.
     
    • Thanks Thanks x 1
    • Like Like x 1
  5. jw80

    jw80

    Joined:
    8 May 2012
    Messages:
    25
    Thanks Received:
    0
    Location:
    Worcestershire
    Country:
    United Kingdom
    That's fantastic, thanks both. Got the Hive on order so will install at the weekend.

    These forums and the kind folk who post on them never cease to amaze me :)
     
    • Like Like x 1
  6. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  7. Sponsored Links
Loading...

Share This Page