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two remote radiators not working

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RLS
RLS Member Posts: 4
in Strictly Steam
Two of the more radiators in one pipe steam system either underperforming or not performing at all when all the others on all floors and sides of the building work fine. Three story 1915 Victorian with five year old steam boiler. See attached schematic

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  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,578
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    End of the line rads cold

    Is this a parallel flow or counter flow system?

    What sort of main vents are on the dry returns if parallel?

    Can you try the open vent test? You need a helper to switch off the boiler when steam arrives.

    If your pressure is above 1.5 psi, some radiator vents will not work.--NBC
  • Dave in QCA
    Dave in QCA Member Posts: 1,787
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    the old rule is...

    Vent your mains fast and vent your radiators slow, but completely.

    Any combination of slow main vents and fast radiator vents will play heck with even steam distribution, causing the last radiators, to not get steam.

    Since you have a new boiler, pictures of the piping connecting to the boiler as well as your radiators and vents would be a great help to those of us who are trying to get a handle on your system and offer sound advice.
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
    http://grandviewdavenport.com
  • Jamie Hall
    Jamie Hall Member Posts: 23,595
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    Does sound

    like a venting problem.  If the air can't get out, the steam can't get in.  Check those vents.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England

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