on non modulating pomps?

enrico1970

Hello,

I just changed my boiler; now it is open-therm, but my Thermosta is the old "non-open-therm".

I would like to change it for the new model, but... while the boiler has a modulating pump, I find myself with 2 other "non-modulating" pumps installed on the manifold of my underfloor heating system.
Now everything works correctly and my doubt is that if I modulated the boiler pump with the 2 pumps that, on the contrary, always push to the maximum, I would risk causing damage and sending the heating system into crisis.
Any ideas?

Thanks

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Commentaires

9 commentaires

  • Comment author
    GEORGzer Community moderator

    How are the pumps wires connected to your current system right now? Are they wired to the boiler or directly to the old thermostat?

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  • Comment author
    enrico1970

    Hello, the pumps (27 years old Grundfos) are connected to the old Thermostat.

    The are set on/off by it.

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  • Comment author
    GEORGzer Community moderator

    I see, then I‘m afraid you‘re correct and hooking them up to the Modulating Thermostat won‘t work.
    Maybe your new boiler actually has terminals for external pumps, some do.

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  • Comment author
    enrico1970

    Thanks for answering.

    It looks that my boiler (Ariston Class one) can handle external pumps, but the manual talks about modulating pumps.

    In that situation, I should change the pumps too? Or could I keep the non-modulating?

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  • Comment author
    sergeantd

    As far as I know Ariston boilers are not OpenTherm but Ebusd. So the Netatmo Modulating thermostat won’t be compatible.

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  • Comment author
    GEORGzer Community moderator

    That is something that is quiet hard to evaluate from a distance.
    Maybe contact the company that set up your new boiler, I‘m sure they can answer you that question.

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  • Comment author
    enrico1970

    Luckyly Ariston are now Opetherm since 2022:

    https://depaolipaolo.it/news.asp?GesNewId=11287

    OpenTherm è compatibile con le caldaie Ariston di ultima generazione come Genus One, Clas One, Cares S

    =:)

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  • Comment author
    enrico1970

    PS

    Here the link to the pdf on OpenTherm by Ariston:

    https://mdata.it/upload/Depaoli/gesnew/Depaoli_11287emb_02.pdf

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  • Comment author
    sergeantd

    Thanks for the link! Finally they supported OpenTherm ( Probably EU forced all the boiler manufacturers to support a common protocol ). By the way I think you should install the Light Gateway OT ( index 2 ), if it is not already included, to transform the Ebusd to OpenTherm.

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