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

  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
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    The black wheel should be turned anti clock wise before you fit the Hr 92 on the base.

  3. #3
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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
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    So you've sorted it,or not?

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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?

  7. #7
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    Just out of curiosity,what temp setting do you have set when the heating is off,mine are set to 5 degrees so basically a frost protection setting.I take it the stroke setting is set to the default of 0 on the Hr92.

  8. #8
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    Just noticed on the graph you are showing that your set back temp is 15 degrees,that could well be your problem,try setting it to 5 or ten degrees and see what happens.

  9. #9
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    Quote Originally Posted by jbuller View Post
    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?
    This should be a fairly easy problem to diagnose. Start with the basics.

    Turn the zone down to 5C, (to ensure the HR92 has fully closed the valve - listen to it to make sure you hear it closing) wait for the radiator to cool, turn another zone up several degrees higher than its set point to produce a high boiler demand and see if the radiator that's turned down heats up with the one that you turned up.

    If it does you have a mechanical problem with the valve not closing properly. Why you might have that with brand new valves is hard to say. Does it definitely still heat up if you manually screw the black wheel down ? (Don't over tighten it as it's only a plastic thread)

    I have Valencia's myself and I would recommend:

    1) Unscrew the "balancing insert" (the black plastic bit around the pin) until it is loose then tighten it slightly so it doesn't flop around. By default they come with the insert screwed in a long way which restricts the range of motion of the valve too much.
    2) Set the HR92 Stroke mode to 1, which increases the force used to close the valve and increases the total range of travel. I found despite being Honeywell and being recommended for HR92's they don't work very well with the HR92 in the default Stroke 0 mode. Other Valencia owners have disagreed with me on this point but this is what I have found with mine.

    My Valencias have been working perfectly with this configuration for a couple of years, and they certainly don't have any trouble with not closing properly - unlike the original valves they replaced which did have trouble with not closing properly after they had been in the system for a couple of years.
    Last edited by DBMandrake; 9th September 2020 at 11:38 PM.

  10. #10
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    Thanks for the advice.
    Turn the zone down to 5C, (to ensure the HR92 has fully closed the valve - listen to it to make sure you hear it closing) wait for the radiator to cool, turn another zone up several degrees higher than its set point to produce a high boiler demand and see if the radiator that's turned down heats up with the one that you turned up.
    Did this. It warmed up

    1) Unscrew the "balancing insert" (the black plastic bit around the pin) until it is loose then tighten it slightly so it doesn't flop around. By default they come with the insert screwed in a long way which restricts the range of motion of the valve too much.
    I've not touched it yet but here's what it looks like
    https://photos.app.goo.gl/hRwypUZjy8APMmz27
    How much are you suggesting unscrewing the top nut?

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