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  1. #14
    Join Date
    Dec 2014
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    Switch the pumps. What happens? Does it follow the questionable pump?

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  2. #15
    Join Date
    Nov 2011
    Location
    East Side
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    Ok. So the only issue is that the new pump (on the right) draws locked rotor amps when
    Started?

    You said nothing changed except
    You rotated the pump, and added piping. That could be quite a change for a small pump. First, I would verify check valve is actually opening.

  3. #16
    Join Date
    Feb 2005
    Location
    Florida
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    Thread Starter
    Quote Originally Posted by 71CHOPS View Post
    Ok. So the only issue is that the new pump (on the right) draws locked rotor amps when
    Started?

    You said nothing changed except
    You rotated the pump, and added piping. That could be quite a change for a small pump. First, I would verify check valve is actually opening.
    If I pull the red hose and let it free flow its runs fine and draws 4.5 amps.

  4. #17
    Join Date
    Jul 2018
    Location
    Wisconsin
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    What took out the original pump?

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  5. #18
    Join Date
    Feb 2005
    Location
    Florida
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    Thread Starter
    Quote Originally Posted by Spitz View Post
    What took out the original pump?

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    grounded

  6. #19
    Join Date
    Dec 2014
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    Did you try switching the pumps or is that not feasible here?

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  7. #20
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    25,622
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    Check valve hung up?

  8. #21
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
    Posts
    3,759
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    Post the pump curve if you have it. When you tested the shut-off head did it match the pump curve?
    No man can be both ignorant and free.
    Thomas Jefferson

  9. #22
    Join Date
    Feb 2005
    Location
    Florida
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    Thread Starter
    It's the same model pump that was removed.
    It flows 25 gpm at 45 psi.

  10. #23
    Join Date
    Nov 2004
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    up in the hizzy
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    Quote Originally Posted by jimp View Post
    If I pull the red hose and let it free flow its runs fine and draws 4.5 amps.
    That does not make any sense if we are talking about a centrifugal pump but if its a positive displacement pump then is very likely that the outlet is restricted somewhere!
    There is not better place for the working men than the union! 100% UA the only HVAC union!

  11. #24
    Join Date
    Jan 2013
    Location
    United Kingdom
    Posts
    267
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    Pump wiring Star or Delta on both pumps ?


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  12. #25
    Join Date
    Feb 2005
    Location
    Florida
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    Thread Starter
    Quote Originally Posted by valdelocc View Post
    That does not make any sense if we are talking about a centrifugal pump but if its a positive displacement pump then is very likely that the outlet is restricted somewhere!
    Centrifugal, outlet goes from 3/4" to 1.5". I pulled the red hose off the barb and put a piece of 1.5" on it, then it pumped into the tank fine.

    It only stalls and pull high amps when its hooked up in normal configuration.

  13. #26
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    Nov 2004
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    up in the hizzy
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    Quote Originally Posted by jimp View Post
    Centrifugal, outlet goes from 3/4" to 1.5". I pulled the red hose off the barb and put a piece of 1.5" on it, then it pumped into the tank fine.

    It only stalls and pull high amps when its hooked up in normal configuration.
    A centrifugal pump will draw more amps when pumping unrestricted, unless the tank is under vacuum the pump should draw less power with piping attached to the discharge and more amps free flowing!
    There is not better place for the working men than the union! 100% UA the only HVAC union!

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