Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.

If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Need to contact us? Visit https://heatinghelp.com/contact-us/.

secondary low water cut off on residential steam boiler

wo47wo47 Member Posts: 2
Where is the best location for a secondary LWCO with manual reset on a gravity residential steam boiler, the house was converted into a business and a state inspector came in to inspect as commercial, he said my customer must add one. The minimum water line is just below the bottom of the site glass? It is a Bryant  BS2 steam boiler? Thanks

 

Comments

  • SteamheadSteamhead Member Posts: 13,340
    That's a re-branded Dunkirk Plymouth boiler

    and I don't believe a secondary LWCO tapping is provided.



    The actual probe for the primary LWCO is mounted in the front of the boiler, and a cable connects it to the LWCO control which is mounted on the side of the boiler. It might be possible to attach a Hydrolevel manifold to the sight glass at a higher level, install a primary LWCO there and change the original LWCO, which would now be the lower of the two, to the secondary one. But I've never done it that way on that boiler...........
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Baltimore, MD (USA) and consulting anywhere.
    https://heatinghelp.com/find-a-contractor/detail/all-steamed-up-inc
  • wo47wo47 Member Posts: 2
    Secondary LWCO

    Thanks for the info Steamhead, the inspectors write up stated that the secondary LWCO had to be above the boiler manufactures lowest permissible water level, the boiler has a sticker about 2 inches below the low point of the sight glass with a horizontal line showing that point as the lowest permissable water level.

    I ended up removing the sight glass so I could install (2) 1/2 x 3/4 tees, one at the top and one at the bottom of the sight glass connections, I installed 2 so when I put my sight glass back on it would be the same distance from the boiler on the top and bottom of the sight glass (keeping the glass straight when reinstalled), I then plugged the top tee and installed my McDonnell & Miller 751P-MT-120 LWCO into the branch of the lower tee, then I reinstalled the sight glass and wired my LWCO to shut the burner down if the water level ever gets that low. I should pass inspection as I am lower than the primary LWCO but higher than the lowest permissible level, I'll let you know what the inspector says, Thanks again, Walt
This discussion has been closed.

Welcome

It looks like you're new here. If you want to get involved, click one of these buttons!