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Thread: Evohome: hot water secondary loop control

  1. #1
    Automated Home Jr Member
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    Question Evohome: hot water secondary loop control

    Hi everyone. I have a relatively new Evohome system which generally seems to work. We have a secondary loop for domestic hot water driven by a dedicated secondary pump (sometimes known as a bronze pump). We are using the wireless DHW stat clamped on a pipe just outside the tank and my question is how we drive the secondary pump at all times when the DHW demand is on? I cannot see an output for DHW demand and at present the pump is taking a live feed from the DHW valve circuit but this is not our desired behaviour.

    Dan

  2. #2
    Automated Home Legend top brake's Avatar
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    it is not possible to configure evohome to control secondary circulators

    recommend a bronze pump connected to a timer or one of the grundfoss intelligent secondary circulators that have a pipe sensor
    I work for Resideo, posts are personal and my own views.

  3. #3
    Automated Home Legend paulockenden's Avatar
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    Id you are a bit of a tinkerer it would be very easy to do this with a Raspberry Pi or similar. Loop every 10 mins querying the TCC server. If DHW is on then run the pump. Wire this in parallel with the BDR91, else the 10 minute cycle means your boiler might run for a while without water being pumped through it, which wouldn't be nice!

    P.

  4. #4
    Automated Home Sr Member
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    Or even the new Raspberry Pi Zero - unbelievable cost of 5 (or a tenner if you want some cables as well). Managed to get 2 of them before they all sold out (all 20,000 of them).

    The ultimate IoT board... having them as slaves to a full Rasp.Pi 2 is the way to go...

  5. #5
    Automated Home Jr Member
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    Thanks all. I have fitted an old timer. Very high tech!
    Last edited by dkleeman; 5th December 2015 at 08:46 AM.

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