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Thread: OpenTherm VR33 and Vaillant ecoTEC plus 428

  1. #11
    Automated Home Jr Member
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    I have nothing connected to the eBUS. What do you mean by 'additional boiler controller'?
    My existing system (Y-plan) just controls the demand signal into terminal 4 on the boiler board - which I believe you are saying will need to be permanently looped ON.

  2. #12
    Automated Home Legend
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    If you look at your boiler, it comes with a blank face plate. Some installations replace that face plate with a controller for things like scheduling etc. Most don't have it.

  3. #13
    Automated Home Jr Member
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    I see. I'm pretty sure there is nothing 'non-standard' there. Here's a picture of the front panel.boiler-frontpanel-snip.jpg

  4. #14
    Automated Home Legend
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    You see that plate with Vaillant printed on it, that is removable and it can be replaced with a controller. You don't have it.

  5. #15
    Automated Home Jr Member
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    Excellent - thanks. Sounds like I'm pretty much set.

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