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Thread: VFD's on pumps.

  1. #1

    VFD's on pumps.

    We have a began the install of adding VFD's to our heating loop on 2HP motors or less.
    I am being told that on a 6 story building with 3 separate wings fed off of the main, with their own supply and returns to each wing ( 6 stories ) can be fed off of one pump at 20% cap and to shut down the other two wings pumps.
    Beyond pressure issues, what about flow issues?
    Doesn't this seem unrealistic to anyone else?

  2. #2
    Join Date
    Aug 2004
    Location
    Tucson, Az
    Posts
    337
    Not sure of all the technical but what is the return on investment?

    We don't put anything less than 5 HP and I really wonder if the ROI supports that decision.
    Jim
    Tucson, Az
    Keeping the Ice Cream Frozen!

  3. #3
    From any of my calculations we are not going to see any investment in the pumps.
    I have placed them inline for flow control to slow down the flow.
    Odd situation is we are not modulating them on return temp, etc which has yet to make since either.
    Guess I'm going to have to wait till next year to take readings on the buildings radiant to verify bad theory.
    It's going to be a long year.

  4. #4
    Join Date
    May 2013
    Location
    near knoxville tenessee
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    168
    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

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    Last edited by jpsmith1cm; 06-05-2013 at 09:16 PM. Reason: non AOP Pro Member

  5. #5
    Join Date
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    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

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    Last edited by jpsmith1cm; 06-05-2013 at 09:16 PM. Reason: non AOP Pro Member

  6. #6
    Join Date
    Sep 2008
    Location
    Western PA
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    johnqpublic

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