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moline vapor sytem

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ekim
ekim Member Posts: 3
in Strictly Steam
Can anyone explain to me how the "air trap / vacuum valve" should work on this system? dan does not get into much detail about this in his book. the one on this system does not seem to work. i have replaced the boiler. the system short cycles and takes a long time to heat up unless i open the hand valve on top of the " air trap / vacuum valve". then it heats up quickly with no short cycling. the problem is after about an hour steam starts to come out of the open valve. i am considering leaving the valve open and installing a hoffman #75. any help is greatly appreciated. Thanks Mike

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  • Dave in QCA
    Dave in QCA Member Posts: 1,785
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    moline publication in Heating Help library

    See if this is of any help to you.  http://www.heatinghelp.com/files/articles/1375/27.pdf
    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
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