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Thread: What would you like to see in evohome? (have your say)

  1. #391
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    I don't think a pro system with the same features exists any more. Hometronic was sold as the Pro version to CM Zone, both of which were phased out when Evohome came on the scene. Controlling two actions with IFTTT is quite easy using the webhooks. But yes you can link the two controllers to the same Evohome app and location.
    Its one of the few times when multiple devices bound to a single BDR91 or R8810 makes things so easy
    Last edited by bruce_miranda; 16th November 2020 at 01:41 PM.

  2. #392
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    DbMandrake, found it, I didn't realize the small blue rounds could be clicked on for that purpose. I thought they just indicated how long it would be for the idle screen to activate with the one selected. Very happy now I can see all zones continually.

  3. #393
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    Quote Originally Posted by bruce_miranda View Post
    I don't think a pro system with the same features exists any more. Hometronic was sold as the Pro version to CM Zone, both of which were phased out when Evohome came on the scene. Controlling two actions with IFTTT is quite easy using the webhooks. But yes you can link the two controllers to the same Evohome app and location.
    Its one of the few times when multiple devices bound to a single BDR91 or R8810 makes things so easy
    I wasn't sure smart systems would support multiple honeywell locations/logins but if they do it makes it much simpler. Tend to use either the Honeywell app or IFTTT rather than the physical controller so they could largely be relegated as thermostats in two different rooms perhaps!

    edit: I only just noticed you said multiple controllers can control the same valve, is that meaning the same valve can be in 2 zones one in each controller? Wouldn't they end up fighting over it?

  4. #394
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    Quote Originally Posted by MrBoy View Post
    I wasn't sure smart systems would support multiple honeywell locations/logins but if they do it makes it much simpler. Tend to use either the Honeywell app or IFTTT rather than the physical controller so they could largely be relegated as thermostats in two different rooms perhaps!

    edit: I only just noticed you said multiple controllers can control the same valve, is that meaning the same valve can be in 2 zones one in each controller? Wouldn't they end up fighting over it?
    Pretty sure he meant the system main valve, but I don't think you can assign a single BDR91 unit to two different control systems and it will most likely be a bad idea to place two opentherm modulating units in parallel as well. You could definitely do it with two on/off modules though.

  5. #395
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    Quote Originally Posted by gordonb3 View Post
    Pretty sure he meant the system main valve, but I don't think you can assign a single BDR91 unit to two different control systems and it will most likely be a bad idea to place two opentherm modulating units in parallel as well. You could definitely do it with two on/off modules though.
    You can pair up to 4 controllers to each BDR91.

    So in the case of a two Evotouch system you would have only one controlling the hot water relay (if you had hot water control) and then both controllers would be paired to the heating zone valve relay and boiler relay if fitted.

    Although I don't know for sure, I suspect the TPI duty cycle produced by the BDR91 is simply Max(A,B) of the heat demand from the two different controllers bound to it... (which could lead to some overshoot interaction between them, like you can get between zones, although load scaling would help a lot there by avoiding most large swings)

  6. #396
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    Ah yes I always get my part number mixed up.

    IIRC the "heat-demand" facility is only applicable to some boilers, is it OpenTherm(?) and older boilers it's simply on/off anyway?

  7. #397
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    Quote Originally Posted by MrBoy View Post
    IIRC the "heat-demand" facility is only applicable to some boilers, is it OpenTherm(?) and older boilers it's simply on/off anyway?
    The controller still uses heat demand with a BDR91 - it controls the percentage of time that the relay is on in each (by default) 10 minute cycle.

    So yeah, it's "on/off", but the proportions of on and off vary with heat demand.

  8. #398
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    Quote Originally Posted by gordonb3 View Post
    Pretty sure he meant the system main valve, but I don't think you can assign a single BDR91 unit to two different control systems and it will most likely be a bad idea to place two opentherm modulating units in parallel as well. You could definitely do it with two on/off modules though.
    Indeed you can. You can pair a single OTB or a single BDR91 to 4 controllers. The end result is always the sum of all the devices.

  9. #399
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    1) System Summary access directly from Home screen. Really useful status information, shouldn't be hidden behind settings and confirmation dialogue.
    2) More than 4 zones on idle screen - e.g. 6 or 8?
    3) Idle screen option to display System Summary
    4) System Summary for 1) and 4) enhanced by including actual and target temperatures
    5) Touch controller temperature displayed on screen as a handy portable room thermometer when not being used as sensor for any zone

    System summary is great way to educate user that boiler and valves are all proportional and explain a little about what is going on and why
    Last edited by bbstrikesagain; 4th January 2021 at 12:06 PM.

  10. #400
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    A minimum temperature per zone. Currently I have rooms that are set to 10 (program) which heat up to 16 when I set my system to away which is rather stupid.

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