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"False Pressure" in VBM Domobar Junior at startup

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  • Javaphile
    replied
    Make sure you get the valve made for the Junior as the valves vary on different Domobar models.


    Java "Having the right part always helps" phile

    Leave a comment:


  • jbrewster
    replied
    Thanks for the confirmation.

    Ironically enough I had an anti-vac valve issue previously which I repaired only to have the controller fail (intermittent auto-fill fail) on me and cause an element meltdown...

    Third time's a charm maybe... I don't recall what style I fitted when I replaced it the first time but I'll check it out on the weekend.

    Thanks again.

    Leave a comment:


  • Javaphile
    replied
    Originally posted by jbrewster View Post
    Only explanation I can think of is a "sticky" anti-vac that's not properly releasing when the machine turns off, and when the controller runs the pump at startup it's pressurising the boiler which "fools" the pstat into turning the element off prematurely.
    Nailed it the first time.

    To fix the problem from least to most expensive:
    • Clean it
    • Rebuild it - Not always possible depending on design
    • Replace it

    Java "Easy fix" phile

    Leave a comment:


  • jbrewster
    started a topic "False Pressure" in VBM Domobar Junior at startup

    "False Pressure" in VBM Domobar Junior at startup

    I've started noticing an odd issue with my VBM Domobar Junior, it's run off a timer and starts up at 06:30 to pre-heat.

    When I get to it in the morning (about 08:00), the boiler pressure gauge shows the usual 1.4bar of pressure but the group isn't up to temperature (not cold, but also not as hot as it should be). Opening the steam valve causes the boiler pressure to immediately drop (and the pstat to kick back on), after it comes up to temp from there it's fine for the rest of the day.

    Only explanation I can think of is a "sticky" anti-vac that's not properly releasing when the machine turns off, and when the controller runs the pump at startup it's pressurising the boiler which "fools" the pstat into turning the element off prematurely.

    Wondering if the brains trust might have some insight here?

    Thanks,

    -J
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