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Rach Member Posts: 1
Steam heat system is making a loud banging noise it is a vacum vapor system with 2 motorized steam valves. Banging seems to be worse when steam valves are closing note this is a residential application. Boiler is 400,000 BTUs operating on a vapor stat with a receiver tank returns are high and dry

I've checked the vacum vapor vents returns and traps they are ok

should I remove vacum vents and leave the system on vapor?


  • Jamie Hall
    Jamie Hall Member Posts: 23,275
    Are those

    valves dripped on both sides to the wet returns?  If not, they'll be trouble -- and may be your only trouble.  Taking the vacuum feature off the vents won't help the banging.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
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