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Lochinvar Noble part ID

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AlaskaDick
AlaskaDick Posts: 54
in Radiant Heating

What is the screw below the relief valve on my Lochinvar Noble boiler? It's pictured in some, but not all of the illustrations in the manual but I don't see a description and I don't find it in a parts listing.

temp valve.jpg

Comments

  • mattmia2
    mattmia2 Posts: 18,399

    it is a manual bleeder. presumably it is to bleed the boiler. you could bleed it by opening the relief valve too. the relief valve may not reseat if it hasn't been opened in a while

  • AlaskaDick
    AlaskaDick Posts: 54

    Thanks. I didn't want to start turning screws until I was sure what they were.

  • hot_rod
    hot_rod Posts: 28,699
    https://forum.heatinghelp.com/discussion/comment/1905779#Comment_1905779

    That bleeder is used on the first fill up to assure all the air gets expelled from the boiler heat exchanger, a handy addition. In the past it was common to hold the relief valve open until water flowed. But from day one they could leak after getting installation debris in them.

    If you use it put a tray or cookie sheet under it to prevent water getting into trouble below.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    mattmia2
  • GroundUp
    GroundUp Posts: 2,573

    It's just a coin vent for initial bleeding, as has been stated. Kind of a silly design IMO, but it gets the job done. Sometimes I will remove the relief and install a tee, nipple, elbow, and auto vent to ease the startup process. Lifting the lever on a relief for venting is a dangerous game

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