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can i test a grundfos pump with a peice of fles and plug ???

Discussion in 'Plumbing and Central Heating' started by sonofrob, 28 Mar 2018.

  1. sonofrob

    sonofrob

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    hello,,,I have some grundfos water pumps that I need to check to see if they are working,,,my question is can I just wire a piece of flex to them and plug it into the mains to see they turn or would that burn out the start capasitor or something???,,,I was just thinking maybe they are on a voltage drop when wired onto a boiler??? and putting 240 volt straight into them might damage them??? anybody???
     
  2. stem

    stem

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    Under normal use they are subject to a permanent 230V so no worries there.

    However, I assume that you want to bench test them, so they won't be actually circulating any water. In which case, you can run them briefly, but their bearings are designed to be water lubricated so don't run them for long. I would recommend the use of an RCD, if the socket you plan to plug it into isn't supplied via one. And a 3A fuse in the plug.

    Often an old pump that has failed and been taken out of service will run when powered up and running in fresh air, but wasn't previously able to manage to circulate water around a heating circuit. So the bench test might not prove much.
     
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  3. just pumps

    just pumps

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    Could test in theory with water and a pressure gauge if you knew the discharge pressure, as said they don`t like being run dry!
     
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