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Thread: Evohome is Noisy - please help me

  1. #41
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    Quote Originally Posted by DBMandrake View Post
    Unavailable to me as well.

    You need to make your video publicly available...

    Either set it to unlisted or public. Unlisted means you can post a URL to a video and anyone can follow the URL to see it but it is not listed in your youtube channel and doesn't show up in search results.

    Public means it will also be listed in your youtube channel and in youtube search results...
    Silly me - it was Public but I hadn't pushed the Publish button!

  2. #42
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    I really like this idea Chrisgare.

    I'm not so sure that the meter reading should be taken too literally though - but I do understand the sentiment! Sound pressure levels are not additive in the way that perhaps you are expecting. It's nicely explained on this page which includes the note that "a doubling in sound intensity is only a 3 dB change in decibel level". So, with that in mind, the HR92 TRV made a noise which effectively doubled the noise in the room. But again, due to context, that information is meaningless! So, who wants to find the nearest anechoic, isolated chamber and do a round of tests ;-)

    Coincidentally I have qualifications in Sound Engineering, hence my initial raised eyebrow on this method :-)

    In any case - I'll make a video to see if I can highlight this issue and post it here as soon as I can.

    Cheers,
    Sentry1

  3. #43
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    As I hinted at in an earlier comment, I think there's an additional psychological element.

    I used to live in a flat above someone who played his music really loud. It got so annoying that in the end even the smallest noise from his flat would drive me mad.

    I suspect it's the same with HR92s. Once you start to get wound up by the noise you're going to really notice them, and get annoyed by even the quietest of whirs.

    Ultimately they are mechanical devices containing a motor. There's always going to be SOME noise from them. But I think HR92s are remarkably quiet, especially considering what the manufacturers of competing products have managed to achieve.

  4. #44
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    Quote Originally Posted by Sentry1 View Post
    I really like this idea Chrisgare.

    I'm not so sure that the meter reading should be taken too literally though - but I do understand the sentiment! Sound pressure levels are not additive in the way that perhaps you are expecting. It's nicely explained on this page which includes the note that "a doubling in sound intensity is only a 3 dB change in decibel level". So, with that in mind, the HR92 TRV made a noise which effectively doubled the noise in the room. But again, due to context, that information is meaningless! So, who wants to find the nearest anechoic, isolated chamber and do a round of tests ;-)

    Coincidentally I have qualifications in Sound Engineering, hence my initial raised eyebrow on this method :-)

    In any case - I'll make a video to see if I can highlight this issue and post it here as soon as I can.

    Cheers,
    Sentry1
    As I've been a Fellow of the IET for 30 years so I can only agree! However, the point was to show that the valve is very quiet in operation. You could hear that road noises outside the house were at the same level and my breathing was so much higher I had to hold my breath for the recording! All good fun though.
    Last edited by chrisgare; 5th December 2016 at 01:06 PM.

  5. #45
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    I understand that there's always I psychological element to noise perception. However, remember in this case the main priority are my kids. Unfortunately the Evohome TRVs wake them up! I will get a video of the noise up on here soon (with all the obvious sound level normalisation caveats) and you lot can see what you think.

    I'm clinging on to the hope that the reason for the noise is that the HR92 motor & gearing needs to work really hard to move the valve pins - which I hope are really stiff by normal standards.

  6. #46
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    You need to take one of the HR92s off the valve completely so it's not under load and then test it. It won't get any quieter than that. If that's still too noisy for you then unless you are prepared to do something like covering the HR92 to dampen the vibration through it's plastic body, you're unlikely to end up happy.

    Testing with a noise meter to make this more quantifiable is a good idea, but as Paul said, noise pollution is very subjective and an annoying noise to someone might not even be registered by someone else.

    Also, using a phone app is not really going to give us accurate results if we're trying to compare each other's HR92s. Even professional sound meters need to be calibrated regularly to ensure they give accurate results and unless everyone uses the same model of phone and is very careful about how they take the readings I'm afraid we're going to end up with misleading data.

  7. #47
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    Quote Originally Posted by Arrghh! View Post
    You need to take one of the HR92s off the valve completely so it's not under load and then test it. It won't get any quieter than that. If that's still too noisy for you then unless you are prepared to do something like covering the HR92 to dampen the vibration through it's plastic body, you're unlikely to end up happy.

    Testing with a noise meter to make this more quantifiable is a good idea, but as Paul said, noise pollution is very subjective and an annoying noise to someone might not even be registered by someone else.

    Also, using a phone app is not really going to give us accurate results if we're trying to compare each other's HR92s. Even professional sound meters need to be calibrated regularly to ensure they give accurate results and unless everyone uses the same model of phone and is very careful about how they take the readings I'm afraid we're going to end up with misleading data.
    I am not sure what any of this proves. HR92s do whirr and the whirring makes a noise. The whirring is most noticeable when the valves first open as it lasts longer than the short temperature variation adjustments. Most TRV pins are sufficiently strong to resist being pressed in by a finger. I check mine each summer and press them in with the bottom of a hammer. when we have visitors, they all notice the valves opening and closing.

  8. #48
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    It doesn't prove anything at the moment, but if we can discuss the level of noise objectively rather than subjectively, there is a possibility those who find it objectionable can find a way to make their installation quieter.

    I personally don't think much can be done other than suggestions I've already made, but I keep an open mind and although it doesn't bother me that much I would be interested in making mine quieter if it was possible without too much more money being spent.

  9. #49
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    Quick spreay of silicone wd40 into the gears underneath?

  10. #50
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    Went into Screwfix today to get some plumbing stuff. While I was in there I got them to open some TRV boxes for me so I could test the pressure required to move the pins. The Terrier TRVs (Product ID 9338G) had a much wider "pin" and seemed easier to push down. Now it could be that the width of the pin was the only factor in this "feeling" of less resistance but I may well get one and give it a go. At the very least I'm going to take an HR92 into the shop and try it out on the adapters in question.

    Will keep you posted.

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