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15-58 bleed screw

EYoderEYoder Posts: 56Member
Just wondering, I'm seeing some Grundfos 15-58 circs with bleed screws and some without. Both are new in box. Are they making them both ways?
Thanks!

Comments

  • hot_rodhot_rod Posts: 11,608Member
    And sometimes if you pop off the plastic nomenclature cover, there is an end shaft screw slot plug hiding beneath.

    The exposed end caps seem to come and go?

    The date of manufacture used to be listed on the data plate, week and year, check and see if some are older inventory.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • GroundUpGroundUp Posts: 540Member
    They seem to be hit and miss. I buy 4-5 dozen 15-58 a year and they hop back and forth. Never found a rhyme or reason myself
  • edited August 10
    I like the slotted screw; helps when you want to make sure the shaft is turning and sometimes for eliminating air when it's stuck inside the pump.

    But has Grundfos ever listened to me?
    Often wrong, never in doubt.

    Click here to learn more about this contractor.
  • hot_rodhot_rod Posts: 11,608Member

    I like the slotted screw; helps when you want to make sure the shaft is turning and sometimes for eliminating air when it's stuck inside the pump.

    But has Grundfos ever listened to me?

    One unsubstantiated rumor I heard was concern about liability if someone opens that screw and gets a blast of steam in the face, or elsewhere?

    Having it under a cover where a DIYer is less apt to "screw" with it is maybe a good compromise?

    I've certainly experienced that with an air locked wet rotor circulator.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • EYoderEYoder Posts: 56Member
    Thanks a lot for the info. Seems odd they're made both ways. Weird.
  • Steve MinnichSteve Minnich Posts: 2,456Member
    Every 15-58 that I’ve installed or pulled did not have the screw. Loved it on the 15-42s though. I’m not sure why I keep so many used pumps? I’m not a contractor.
    Steve Minnich
    Tell me I can't, and I'll show you I can.
  • LanceLance Posts: 137Member
    I am confused between the use of terms here, bleed vs. shaft screws. I am only aware of the fact the many very low Horse Power 115v pumps had very little torque and the shaft screw was used to free up a stuck shaft from sitting over the summer. Than came a capacitor which helped. But this is engineering to solve a problem discovered.
  • GroundUpGroundUp Posts: 540Member
    @Lance some of the Grundfos circs have a small SS screw/plug in the end of the case opposite the volute that both helps to bleed air and can be removed to verify the shaft is spinning (or not) as it's directly beyond the end of the shaft. I have also used it to push start a sticky circ after sitting many years, just poke a pick in the hole and give it a little push
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