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Thread: amp meter pump

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    In the Industry

    Join Date
    Jul 2008
    Pittsburgh, PA

    amp meter pump

    Lately I have been running into a lot of older pumps that have trouble holding a prime with no air leaks or obstruction. I will prime them with forced flow from a hose and rag in the skimmer, they will seem to run ok, and then slowly lose prime over night. I dont have an amp meter and Im not sure what to look for if I get one. If i buy one am I just checking to see if the amp draw is higher than the runing amps listed on the motor plate? How much higher is ok? What does this higher amperage tell me? And finally, what is the cheapest amp meter that will function correctly? Thanks.
    Involved in the pool and spa industry
    Pittsburgh, PA

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: amp meter pump

    Usually a failing motor is spotted by other factors than current measurements so I am not sure how that relates to the priming issues. A poor priming pump is usually caused by one of several things; a clogged/damaged impeller, a suction side air leak or a pressure side blockage which could be due to a dirty filter. Check one of those to see if you can't find the problem.
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: amp meter pump

    If they're having a problem holding prime it's most likely that the wet end is worn pretty badly. The good news is that they can be rebuilt.

    As mas985 said motor current is probably not going to tell you much. I'd take it anyway if I had an amp meter. Unloaded amps should be about 1/3rd of full load amps but it can run as much as 1/2. Listening to the bearings and seeing how it starts and stops will give you a good indication of the health of the motor.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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