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Thread: Atag IS24 Plus Evohome Plus Opentherm

  1. #91
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    I donít have an outdoor sensor, but would be interested to hear if it will work with OT!

  2. #92
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    Thanks for the info. Could you tell me more about the part you mentioned please? I assumes there would be screw terminal blocks on the boiler side, but it sounds like this this is not the case?

    Thanks

  3. #93
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    Quote Originally Posted by RussC View Post
    Thanks for the info. Could you tell me more about the part you mentioned please? I assumes there would be screw terminal blocks on the boiler side, but it sounds like this this is not the case?

    Thanks
    It is just a small adapter. My installer told me that he had boxes of them in his van!

  4. #94
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    Quote Originally Posted by fergie View Post
    I donít have an outdoor sensor, but would be interested to hear if it will work with OT!
    What would it do that OT doesnít? Evohome/OTís fuzzy logic already calculates the TSet flow temperature depending on zone temperature differentials and demand. Unlike some other boilers, Atag/OT also over-rides the manual CH max flow control.

  5. #95
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    In a perfect world the sensor would tell the boiler to work harder or work less depending on the temp outside. But that then may start working against evohome. Even better would be if evohome could use the local weather to adjust its demands.

  6. #96
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    Quote Originally Posted by fergie View Post
    In a perfect world the sensor would tell the boiler to work harder or work less depending on the temp outside. But that then may start working against evohome. Even better would be if evohome could use the local weather to adjust its demands.
    My local weather (and the App is still not showing it), is 12 miles away and a 1000ft lower. In Winter, morning temperatures are usually 3 to 6C lower than we get because of the effects of lapse rates and katabatic drainage (cold air flowing down slopes). Others have commented that weather compensation works best in Spring and Autumn: not Winter.

  7. #97
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    Quote Originally Posted by HenGus View Post
    It is just a small adapter. My installer told me that he had boxes of them in his van!
    Should be straightforward then, thanks.

  8. #98
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    Thought I'd give it a few days before reporting back. New economiser 27 went in on Thursday, and so far so good. Just works perfectly with evohome, after a day or two characterising they're working together brilliantly, every zone accurately regulated and minimal overshoot. Tonight it's dropped to -11C outside and it's just transparent to the user, no adjusting temperature set points... Brilliant!

  9. #99
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    I have just had an Atag IC 35 installed. I spoke with their technical team about wiring OT thermostat and they said I could use the black adapter that comes in the unit as it will fit on the blue connection point in the boiler. I had to knock off a small plastic tag but this works and my OT thermostat is up and running and commincating with the Evohome controller. Thought this might be useful for people who might be trying to order the blue adaptor.

  10. #100
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    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!

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