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Air in the heating loop

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  • Thetech11
    Thetech11 Member Posts: 26

    It is a 1/2 pex going to 3/4 inch baseboards and back to 1/2 pex all around the apt. They used reducers, I guess to save on cost. All that resistance and the fact we are on the 4th floor, might call for the higher pressure, don’t really know.

  • hot_rod
    hot_rod Member Posts: 26,992

    keep an eye on the relief valve if you run elevated temperature

    The expansion tank needs to have the precharge adjusted , and expansion volume if the tank will be decreased

    A bucket under the relief valve may be helpful

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,840

    @Thetech11

    I am assuming the system never had any glycol in it. I only mention this because glycol can foam and act like air.

  • Thetech11
    Thetech11 Member Posts: 26

    no never

  • neilc
    neilc Member Posts: 3,139

    without my going back and rereading everything,

    is this set up pumping away, or towards the PONPC ? (expansion tank)

    known to beat dead horses
  • Thetech11
    Thetech11 Member Posts: 26

    Pumps sways.

  • Thetech11
    Thetech11 Member Posts: 26

    so more air had developed within a few days and back to ground zero.

    Went back to basics. Went back to the original pump 0011, which I and others thought was over kill, which had power and was running that was replaced with a 007e. I opened it up and pullled out cartridge and Low and below found a crack on the shaft on the impeller. Mist have been slipping within the pump motor.


    Removed the 007e and bought a new 0011, purged, seemed to get the big air pockets out. With a few mins. Within a few mins of running the boiler cycle the siprovent started pitting air out.


    It ran perfect last night once it ran and pushed all the air out. One of the coldest nights of the yr in nyc.


    Don’t really understand why it worked or why the 007e didn’t work. I assume with the choked down from 1/2 inch. Pex to 3/4 baseboards up to a 4th floor required that much head. I might have been able to put in a 0010 but didn’t want to push it.


    Was able to bring water temp from 200 back to 180 where it should be.

    Lesson leaned even tho pump sounds like it works and has 120v, open it always.


    thanks to everyone that helped.

    bjohnhy
  • hot_rod
    hot_rod Member Posts: 26,992
    https://forum.heatinghelp.com/discussion/comment/1880633#Comment_1880633

    I learned a similar lesson years ago on a no heat call. The pump had failed so I'm running back into the home with a new wet rotor replacement. I slip and fall on the icy sidewalk. Get the pump installed purge and purge, very little heat.

    Turns out the ceramic shaft in the pump broke when I hit the concrete sidewalk. I could see the end of the shaft spinning in the screw opening, but the impeller was no longer connected!

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,840

    I have found the 007s to be a little weak. Regardless of their rated capacity (and you see them on every job) they don't seem to have much Getty up.

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