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What is this?

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tylerjgardner
tylerjgardner Member Posts: 14
in Strictly Steam

Doing a steam boiler install and my co worker asked what this is. I said "no idea lol". Its a two pipe system and this is at the end of the re

20260325_104236.jpg
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turns.

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 27,352

    Dunham Return Trap for Dunham vapour steam system. It's in The Lost Art — look it up.

    That system should be controlled with a vapourstat running at a cutout of 8 OUNCES per square inch or less.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • tylerjgardner
    tylerjgardner Member Posts: 14

    Interesting. What are the consequences if I run it at 1.5 oz? The old system had the standard pressuretrol (same as this new system)

  • ethicalpaul
    ethicalpaul Member Posts: 8,779
    edited 5:17PM

    I think you mean your pressuretrol is set to 1.5 psi

    That is way too much especially since most pressuretrols that are set to 1.5 actually cut out between 2 and 2.5 psi

    (8 oz is .5 psi)

    NJ Steam Homeowner.
    Free NJ and remote steam advice: https://heatinghelp.com/find-a-contractor/detail/new-jersey-steam-help/
    See my sight glass boiler videos: https://bit.ly/3sZW1el

  • tylerjgardner
    tylerjgardner Member Posts: 14

    I mean 1.5 psi

  • KC_Jones
    KC_Jones Member Posts: 5,934
    https://forum.heatinghelp.com/discussion/comment/1892836#Comment_1892836

    If you sized the boiler correctly it shouldn't get to 1.5 psi, so it shouldn't matter. The vaporstat or pressuretrol are pressure safeties. On 2 pipe the sizing is extremely critical, I feel it's critical for all systems, but the 2 pipe are typically more sensitive to pressure, which is a function of boiler sizing. How did you size the boiler?

    I agree with Jamie though, it should have a vaporstat to ensure it doesn't have a chance of getting out of hand.

    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
  • tylerjgardner
    tylerjgardner Member Posts: 14

    So yeah I would LOVE to install a vaporstat, but the salesman won't want me to get a $500-600 part for this. Also the salesman sized this boiler- you guys are gonna love this- "the old one was this size so I got the same size boiler for this zone". Theres a lot of things I can see wrong with this install, but unfortunately I was told to just "slap in it exactly how the old was was". Im beginning to realize that the company i work for is the "knuckleheads" the Dan Holohan warns homeowners about lol.

    ethicalpaul

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