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Thread: Radiators with Evohome HR92 and Valencia valves warming when they shouldn't

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  1. #1
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    Default Radiators with Evohome HR92 and Valencia valves warming when they shouldn't

    Hello

    I hope someone can help with stopping radiators warming unexpectedly.

    I've just had Honeywell Valencia V120-15 valves and Evohome HR92s put on all but one of my 9 radiators over 3 floors served by a combi boiler. We have a schedule setup in the Evohome app and optimisation is turned on.

    We are also using Control4 but this should be just an alternative interface, no additional instructions. An issue that may or may not be related is that it sometimes seems to get confused between (exaggerated) Fahrenheit[?] and Celsius readings. There room value do flick back. However the tiles consistently displays "49" for all rooms rather than a realistic temperature.

    For three days now radiators in just 2of the rooms have been hot without any apparent need. The current and upcoming set point is (well) below the current temperature.
    temperature-last-24-hour 7-9-2020.jpg
    temperature-last-24-hour Office 2020-09-08.jpg

    Other rooms in the house have not gotten above 22 degrees.
    When I check the HR92 position it says it is 00 (closed) and the controller says its not calling for heat (in the installation menu). Of course it could have gotten hot and already shut down.

    I've re-run calibration on both. In the middle this I verified that the black wheel is turned fully clockwise.*
    I hoped it was the optimisation settling down but its not getting better.

    My only theory is that despite appearances, the valves are in fact open and that whenever another radiator calls for heat, these ones are getting hot water too.*

    Any other explanations? What should I do?

    Screenshot_20200906-203534_Control4.jpg Screenshot_20200906-203548_Control4.jpg

  2. #2
    Automated Home Jr Member
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    The black wheel should be turned anti clock wise before you fit the Hr 92 on the base.

  3. #3
    Automated Home Legend paulockenden's Avatar
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    And make sure the little slidey switch engages properly.

  4. #4
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    I've tripple checked both valves while hot. As before I:
    * Took off the HR92. Checked the black wheel wont turn any more clockwise.
    * Turned it fully anticlockwise
    * Put the HR92 on and slide clicked into place
    * Seen the position reported as 96
    * Heard calibration wind the pin down
    * Checked the position is reported as 00

  5. #5
    Automated Home Jr Member
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    So you've sorted it,or not?

  6. #6
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    No.
    I just verified the same setup as previous days.

    As far as I can tell, when the HR92 says has closed the valve, and a manual finger check shows it cannot be closed futher (without more force than I'm initially comfortable with), it is in fact still letting hot water in to the radiator.

    I can't otherwise explain why these radiators get pointlessly warm?

    This would be so much easier if there was a historic record of when each HR92 calls for heat. But as far as I know you can only check that manually on the controller?

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