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Auto Vent No 67 Auto Bleeder

Gregory_2Gregory_2 Posts: 30Member
edited January 24 in Domestic Hot Water
Do I need to completely drain the system to replace? I have 3 story 1 zone house
and less that 5 lbs of pressure in the system. If I turn off unit can I replace without
draining the whole system?
the auto bleeder is at the top
TIA

Comments

  • Jamie HallJamie Hall Posts: 12,131Member
    You may have to drain it down slightly to avoid getting wet.

    However, if you have a 3 story house with hot water heat, 5 pounds of pressure (I presume in the basement at the boiler?) is nowhere near enough. You should have at least 15 pounds pressure in the system when it's cold; check that before you work on that bleeder, because if it's really only 5 pounds when you crack that vent it's going to such air into the system and you'll have to purge the whole thing. At least you wouldn't get wet...
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • Gregory_2Gregory_2 Posts: 30Member
    Jamie thank u. And yes that’s the issue I keep losing pressure and I think it’s the auto bleeder
    I had another thread going on this forum about it. Thanks
  • Gregory_2Gregory_2 Posts: 30Member
    another quick question. should the old one come off by hand?
    and will I need dope or tape for the threads on the new one

    thanks for your help
  • SuperTechSuperTech Posts: 1,160Member
    It might come off by hand, or you may need a wrench. You can use either pipe dope or Teflon tape, or both of them together.
  • HomerJSmithHomerJSmith Posts: 803Member
    Why do you have such a large air vent on the third floor?

    Caleffi makes a hygroscopic air vent that is very good and in combination with their 1/8" NPT Male Service Check Valve allows changing the vent easy.

    https://www.supplyhouse.com/Caleffi-508013A-1-8-Automatic-Hygroscopic-Air-Vent

    https://www.supplyhouse.com/Caleffi-59474A-1-8-NPT-Male-Service-Check-Valve
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