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Height difference between primary and emergency low water cutouts

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Gateacre
Gateacre Member Posts: 107
in Strictly Steam

Hey folks. Is there a standard for the height difference between a primary and emergency lwco? When our boiler was installed we were having issues with surging tripping the primary cutout. Rather than addressing water quality issues that were likely causing the problem, our contractor simply raised the primary cutout but not the emergency. As a result it takes about 20 seconds for the emergency cutout to trip when doing a blowdown leading to excessive fresh water being taken on.

Thanks

Comments

  • Robert O'Brien
    Robert O'Brien Member Posts: 3,592
    CUT_EC_web0825.pdf

    Both need to be above the minimum safe water level, which means they're about the same height. See attachment

  • 109A_5
    109A_5 Member Posts: 4,063

    How did they move it ? Different tapping ?

    Once the water quality issue is resolved can you just move it back the where the boiler's manual recommends?

    Pictures?

    Boiler Make and model?

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • pecmsg
    pecmsg Member Posts: 7,077
    https://forum.heatinghelp.com/discussion/comment/1893806#Comment_1893806

    good Question?

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 12,241

    Height difference between primary and emergency low water cutouts

    Screenshot 2026-04-07 at 5.47.28 PM.png

    About that much

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

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