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My boiler has automatic fill - how do I adjust the water level?

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tjdumez
tjdumez Member Posts: 10
in THE MAIN WALL
Last winter my boiler level was right where it should be - maybe 3/4 full, slightly more. I flush it regularly so I open the low water cut off, drain some water and the fill valve returns the water level to it's proper spot.
However this fall the water level is super low - as seen by the pictures. How do I adjust the water level?

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  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,576
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    Are you certain the fill valve is opening to let water into the boiler?
    Is the LWCO cutting off the burner as you flush it? It may be time for a teardown and cleaning of the float chamber, (order a gasket kit first!)--NBC
    mikeapolis
  • Jamie Hall
    Jamie Hall Member Posts: 23,327
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    Er... um... in your picture the water level is exactly where the MM 67 operates. Which is perhaps, low, perhaps not. But I agree with @nicholas bonham-carter -- is the fill valve opening? Are the isolating valves for the feeder open (assuming you have them...)?
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Big Ed_4
    Big Ed_4 Member Posts: 2,785
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    1/3 water level would be correct ..

    There was an error rendering this rich post.

  • tjdumez
    tjdumez Member Posts: 10
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    Big Ed_4 said:

    1/3 water level would be correct ..

    ...how about that. Allow me to explain myself.
    I moved into this house in spring, just after heating season. I knew enough to drain some water out of the boiler every week that the boiler was in use, and I noted the water level at the top mark on the sight glass. I would drain some water, auto-fill brought it right back to that mark.

    A lower level does make a bit of sense. Thanks guys!

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