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Pump curve testing ?

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Paul_34
Paul_34 Member Posts: 31
in THE MAIN WALL
  I'm testing the pump curve on a grundfos ups 50-80/4 hooked up to 2.5" copper monoflow tee primary loop and my inlet gauge reading was 14psi and 22 psi at outlet of pump with all the zones calling for heat and with one zone calling for heat it was at 14 psi at inlet and 23 psi at outlet. The boiler has 14 psi in boiler. To get the head of feet number do i use 22 psi or 22psi - 14psi= 8psi to use.       1 psi=.43 head feet.

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  • CMadatMe
    CMadatMe Member Posts: 3,086
    edited August 2012
    2.31

    Ft of head per Psi....8 x 2.31 = 18.5ft of head....If that's the 115v version your moving about 10gpm on speed 2...Which a UPS26-99 can do at much lesser of a price...

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  • Paul_34
    Paul_34 Member Posts: 31
    #

    its on speed 3 with those psi numbers. when i used speed 1 it went down to 19 psi.
  • CMadatMe
    CMadatMe Member Posts: 3,086
    edited August 2012
    Ok

    Still moving close to the same gpm..



    http://net.grundfos.com/doc/webnet/versaflo/literature/L-UPS-PG-01_VersaFlo.pdf

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  • Mark Eatherton
    Mark Eatherton Member Posts: 5,875
    edited August 2012
    Pumpin Math...

    It is the differential across the pump in PSI multiplied times 2.307 = the feet of head being produced under THAT condition...



    ME



    EDIT: Chris beat me to it. I should have checked before I answered.



    ME
  • Paul_34
    Paul_34 Member Posts: 31
    #

    What pump would be a good match in a 2400 series taco.
This discussion has been closed.

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