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Thread: Atag IS24 Plus Evohome Plus Opentherm

  1. #101
    Automated Home Legend
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    A different valve just because of OT? That's interesting.

  2. #102
    Automated Home Guru
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    Aug 2015
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    Quote Originally Posted by bruce_miranda View Post
    A different valve just because of OT? That's interesting.
    The open by default, motor to close valve.

  3. #103
    Automated Home Legend
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    Do what I did. Put in a normally closed valve and make it open with the Pump. That way you can have any configuration you want. This method even deals with Pump overrun, Frost protection etc

  4. #104
    Automated Home Legend
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    May 2014
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    Quote Originally Posted by rotor View Post
    Sorry for reviving an ancient thread! @HenGus, almost three years down the track, are you happy you went with OpenTherm on the ATAG? I'm about to get an iS 24 installed, and having the option to get OpenTherm but wondering if it's worth the added complexity (needing the OpenTherm bridge, the different valve and the labour will probably add £300-400 to the bill). Thanks!
    I have moved home in the past 18 months so my experience of OT/Atag is based on 14 months of use. Unlike some boilers, the Atag worked as it should under OT control; ie, hot water re-heating is controlled to the Max TSet temperature set within the boiler controls. The valve question is an interesting one. The manual states that there is a requirement for what Atag calls a modified diverter valve. I am guessing that this needed whether or not you go for OT control. OT itself is nothing more than the cost of the bridge and a length of low voltage wire! My installer converted my existing 'S' plan by replacing the CH zone valve with an inline valve (power off/OPEN) which he wired in series with the HW zone valve such that when the HW valve opened the CH valve closed. I re-configured the controller.

    Would I bother to install OT again? Yes, I probably would. In truth, the only bits of Evohome that gave me any issues after OT was installed was the CS92A and the occasional loss of comms from a HR92. Building from scratch, I would probably not install the hot water control.

    I haven't bothered with Evohome in my new home as I would not like to leave my wife with a system that she doesn't understand with little help available from installers and family.

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