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Should main vents close if on a return?

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Kjmass1
Kjmass1 Member Posts: 294
in Strictly Steam

We did some re-piping (highly regarded local installer) for a basement remodel. A main was shortened by maybe 40%, and 3x takeoffs were installed at a smaller size so we could route through joist bays. The 2x #2 air eliminators were then moved to the return pipe about 10' past the main for ease of access. It doesn't seem like the main vents close any more, and don't get hot. Trying to adjust the steam timing to those radiators on that branch and didn't know if I needed to add even more venting.

Comments

  • Steamhead
    Steamhead Member Posts: 18,213

    Did they maintain the proper pitch on the main and return? Did they reduce the size of the main?

    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • Jamie Hall
    Jamie Hall Member Posts: 26,852

    Not clear if this is a one pipe or two pipe system. If it's a two pipe system and those really are dry returns (see various snarky comments!) then no, the vents on the returns should never see steam and therefore should never close.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Kjmass1
    Kjmass1 Member Posts: 294

    Sorry 1 pipe steam. plenty of pitch.

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