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Thread: Adding underfloor heating to existing system

  1. #21
    Automated Home Jr Member
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    Quote Originally Posted by mtmcgavock View Post
    No, if you are having UFH you'd have to change you system to an S plan, and have a motorised valve for the UFH. However seeming you have HR92s everywhere all you would need is a 2 port valve on the Hot Water. The heating wouldn't need a 2 port valve (Remember any rads without HR92s would come on with ANY demand) as of your HR92s. I'd put one on the UFH manifold but wire it to the pump. So it opens and closes when the pump runs. You'd need actuators for all the manifold circuits (4), you can get 2 wire and 4 wire actuators. I got 4 wire ones at the time due to not having Evohome, however seeming they only need to open and close I think you'd get away with two wire ones.

    EDIT: Thinking about it, you'd have to have the 4 wire ones. The 4 wire ones include a microswitch to switch the pump and MV open. Just drawn out a quick diagram to think why the reason was I got 4 wire ones!

    https://www.colglo.co.uk/product.php?product=UFCHF5100
    Perfect - thanks.

  2. #22
    Automated Home Legend
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    Oh so the actuators don't allow partial closure on UFH manifolds? Like the HR92 on a TRV?

  3. #23
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    Not AFAIK. The only oddity is that some are Normally Closed and others are Normally Open, but this is obviously something a BDR91 can handle!

  4. #24
    Automated Home Ninja Dan_Robinson's Avatar
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    Quote Originally Posted by bruce_miranda View Post
    Oh so the actuators don't allow partial closure on UFH manifolds? Like the HR92 on a TRV?
    The PWM would cope with this, but we don't get it here.
    Kind Regards - Dan Robinson (Jennings Heating Ltd)

  5. #25
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    a while ago there was a thread about an electrical alternative to the HR92 as it was considered noisy. Is the electrical alternative the same as used on the UFH manifolds?

  6. #26
    Automated Home Sr Member
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    We added 2 ufh zones each with 5 and 2 hydraulic circuits respectively in to single manifold with mixing pump. The HCC with a T87RF for each zone works flawlessly and was extremely simple to install. It also makes for a very neat installation.
    With the HCC you have flexibility in that you can group the hydraulic circuits connected to each manifold port( each with an actuator connected to different HCC "zones”)to different evohome zones.
    Last edited by rvb99; 31st December 2017 at 09:11 AM.

  7. #27
    Automated Home Jr Member
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    Cheers - missed the notification on this - wasn’t being deliberately rude!

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