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Thread: BDR91 binding - check that I've got it right?

  1. #1
    Automated Home Sr Member
    Join Date
    Aug 2017
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    68

    Default BDR91 binding - check that I've got it right?

    Hi:

    I have an S-plan configuration with stored hot water. I have two BDR91s, one when activated turns on the boiler and operates the heating valve. The other will turn on the boiler and operate the hot water valve. If either relay activates the boiler will fire.

    In terms of binding, I bound the heating BDR91 to the 'heating control' setting. When I bound the hot water I bound the temperature sensor and it asked me how many values - I selected the 2 or more, and it asked me to bind the hot water BDR91 - which I did, but it also asked me to bind the heating BDR91 which confused me?

    Have I misunderstood how I should configure the evohome for my system?

  2. #2
    Automated Home Legend
    Join Date
    Sep 2014
    Location
    Scotland
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    2,188

    Default

    What is boiler control set to ? It should be set to none with the two relay system you have.

  3. #3
    Automated Home Sr Member
    Join Date
    Aug 2017
    Posts
    68

    Default

    It is currently set to 'wireless relay box' - and I bound it to the heating BDR91.
    Then when I set up hot water it asked to be bound to both individually.

  4. #4
    Automated Home Legend
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    Sep 2014
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    Scotland
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    Default

    "Boiler control" should only be bound if you have a third BDR91 that directly fires the boiler and does not connect to any zone valves.

    From your description you have two relays connected to two zone valves, and and the zone valves then connect to the boiler to fire it. So you do not want a boiler control relay configured in the evohome setup, only hot water and heating relays in the stored hot water section.

    Have a look at my post here for how to clear the bindings and do them again:

    http://www.automatedhome.co.uk/vbull...ll=1#post37513

  5. #5
    Automated Home Sr Member
    Join Date
    Aug 2017
    Posts
    68

    Default

    Quote Originally Posted by DBMandrake View Post
    "Boiler control" should only be bound if you have a third BDR91 that directly fires the boiler and does not connect to any zone valves.
    Cleared bindings and reset - thanks!

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