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Hive heating wiring - bdr91

Discussion in 'Plumbing and Central Heating' started by Samuel Gray, 1 Sep 2020.

  1. Samuel Gray

    Samuel Gray

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    Hi all,

    I am in the process of updating our heating controls. Looking to install Hive as we had it at a previous house and simply want to utilise the app as we work shift work so do not have set schedules.

    I am looking to install this myself as I always like to attempt in the first instance.

    I have been reviewing my current system. It is a y plan heating system

    We currently have a bdr91 recover and a potterton controls. See picture.

    My question is do I simply disconnect the bd91 and then change switch the pottern control wiring to the new hive receiver? The hive is for both heating and hot water. IMG_20200901_153156.jpg IMG_20200901_153152.jpg
     
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  3. stem

    stem

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    In which case, you should have a dual channel Hive and it replaces the programmer which has the necessary wires to control both the heating and the hot water. The BDR91 can't just be removed though, as the heating wiring would be left open circuit and not operate. So whilst the N and L can be removed from the BDR91 the switching wires in terminals A & B should be bridged to complete the circuit. The Hive will then have full control.
     
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  4. Samuel Gray

    Samuel Gray

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    Hi Stem.

    Thank you for that. it aligns with something i had read last night.

    Rather than bridging A and B could you bridge the appropriate ports directly in the wiring centre and then remove the bdr91? Seems like it would be nearer and remove the extra hardware.
     
  5. stem

    stem

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    Indeed you could and that is how I would do it. Electrically it achieves the same thing.
     
  6. Samuel Gray

    Samuel Gray

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    Thank you! This has been helpful. I look forward to getting this installed soon
     
  7. stem

    stem

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    Great let us know how you get on. The Potterton EP has a link between terminals L and 5. Hive Dual Channel has this link made internally already, so doesn't have a terminal 5. Therefore, you can just discard the brown wire loop between these two terminals.
     
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