open therm compatible wireless modulating room thermostat?

Discussion in 'Plumbing and Central Heating' started by johnnynuffin, 23 Jul 2009.

  1. johnnynuffin

    johnnynuffin

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    Hello folks

    Currently in the process of having a new boiler (Remeha 28c) installed and wanted to know if there are any wireless modulating room thermostats that I can use with it.

    After doing research on google I came up with the following heat controls - but only one of them look like they have modulation control and I am not sure if it will work with the boiler.

    Honeywell CM927
    Siemens REV23 RF
    Ariston - http://www.ariston.co.uk/products-detail.php?t=0&id=0000000016

    Thanks
     
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  3. namsag

    namsag

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    Honeywell have not long brought out a range of statS for what your after think it has the prefix TI or TP
     
  4. johnnynuffin

    johnnynuffin

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  5. glasgowgas

    glasgowgas

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    the honeywell cm 927 is not a modulating stat

    there is a honeywell cm 957 that is wireless and modulating, check their
    website for details

    EDIT after confirmation from mehran
     
  6. mehran

    mehran

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    the honeywell:

    T87 room stat(wired)
    Y87RF room stat(wireless)
    cm937 prog room stat(wired)
    cm957 prog room stat(wireless)

    are all opentherm

    also do Remeha not have a controller called something like the Celcia?
     
  7. D_Hailsham

    D_Hailsham

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    Can't find any reference to the CM937 or CM957 on any Honeywell website!

    The Remeha Celcia 20 is wired, not wireless.

    The current Opentherm Protocol is for wired products only, although they are working on extending it to cover wireless products as well. The main problem is that Opentherm is a two-way conversation while all current wireless products are just one way.
     
  8. namsag

    namsag

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    Dhalisham do a search on TPI. That may bring it up if not next time your passing plumb centre they should have the latest brochures

    Johnny .. yeah thats one its TPI control your after
     
  9. D_Hailsham

    D_Hailsham

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    Eventually found it - not very helpful though, just a sales leaflet. No Spec etc.

    Also found an Opentherm Newsletter darted April 2009 saying that that work was almost finished on the Wireless Protocol, so the new Honeywell devices may be the result.
     
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  11. johnnynuffin

    johnnynuffin

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    Excellent, thanks for your help everyone.

    It seems that alot of these energy efficient boiler products are old hat on the mainland and just coming into play over here.

    I did a search on the honeywell site for TPI as you recommended namsag, and it came up with the DT92E which looks like its modulated.

    Would you recommend a modulated room control over a programmable stat?
     
  12. mehran

    mehran

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    hate to argue with you but i have the honeywell leaflet right here. also says honeywell invented the standard for opentherm. so may guess they could work out a way to make it work wireless. ;)

    also TPI is not the same as open therm.

    TPI stands for Time Proportional + Intergal... it is till a on/off control but trys to work out how quickly your house cools and heats and work out the best firing. better then basic on/off but not opentherm

    will scan in the spec list and post it up
     
  13. namsag

    namsag

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    johnnymuf as mehran has said im getting mixed up with tpi and open therm.

    The wireless stat you want is the Y87RF As listed by mehran



    mehran looking at the brochure it lisst them as CM937 AND CM957 on back page inside it lists them as CM930 AND CM 950
     
  14. johnnynuffin

    johnnynuffin

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    mehran and namsag

    Thanks for advice, the Y87RF and the CM950 looks like the ones that I am after but I cannot find them for sale anywhere.

    My RGI called his supplier and its like they didn't know what a modulating room stat was.

    Any ideas of who might stock any of the above?
     
  15. D_Hailsham

    D_Hailsham

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    If you are installing a Remeha 28c, why not install their Celcia 20, which is an Opentherm programmer. It's not wireless, if that's important to you.
     
  16. namsag

    namsag

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    Although brochures are in plumbcentre they are not in there catalogue yet ....im in there tomorrow if i remember i will ask if they can get them and rough price
     
  17. namsag

    namsag

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    That new not even coming up on PC computers
     
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