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Thread: evohome update 2020

  1. #21
    Automated Home Jr Member
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    Sep 2018
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    Quote Originally Posted by DBMandrake View Post
    Minimum hot water temperature is set indirectly by changing the differential. Minimum = setpoint - differential, so increase the differential number.

    Keep in mind that if the minimum temperature is too low and hot water usage is low there is a theoretical increased risk of Legionalla.
    I think I explained badly, hot water comes on in the morning at this time of year. and reached the set Temp 46C. That gives us two showers, we then leave for work. The Tank is normally at 18-20C at that point. Now if one shower is longer and the tank reaches 10C the boiler comes on ( like a frost setting).It shows as off on the Evo home screen but the BDR 91 box for the water is showing green. Can that Temp be altered ? As I say I think its like a frost setting but for the DHW.
    Thanks,

    FLY

  2. #22
    Automated Home Legend
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    Sep 2014
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    The hot water control does indeed have frost protection although I believe it activates at 5C not 10C.

    Your cold water supply must be very cold, I've never seen it trigger on my system! A couple of other users here have though.

    No you can't disable it, and why would you want to ? A frozen cylinder would be disaster and the frost protection is there to protect you against that. I can't see any reason why you'd want your hot water cylinder to go below 5C.

    It doesn't do a full reheat when the frost protect kicks in - I believe it only goes up to something like 20C, and then won't come on again until it drops below 5C again.
    Last edited by DBMandrake; 13th January 2020 at 09:25 PM.

  3. #23
    Automated Home Jr Member
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    Sep 2018
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    Quote Originally Posted by DBMandrake View Post
    The hot water control does indeed have frost protection although I believe it activates at 5C not 10C.

    Your cold water supply must be very cold, I've never seen it trigger on my system! A couple of other users here have though.

    No you can't disable it, and why would you want to ? A frozen cylinder would be disaster and the frost protection is there to protect you against that. I can't see any reason why you'd want your hot water cylinder to go below 5C.

    It doesn't do a full reheat when the frost protect kicks in - I believe it only goes up to something like 20C, and then won't come on again until it drops below 5C again.
    Thanks for the extra info, I will conduct a few more tests, but im pretty sure its not going off a 5C incoming water main temp is currently 8C maybe a touch more.
    Thanks again.
    FLY

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