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Thread: pre charges

  1. #1
    DIY Junior Member brenjake's Avatar
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    Nov 2011
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    Default pre charges

    Hello I am new at this...but here goes I just installed a grundfos mq-45 booster pump. It is 1hp. It has a precharge tank built in of 25lbs. I have a 86 gal bladder type tank precharged at 38lbs from factory.I am drawing fro a adjacent cistern. My question is since the pump is factory set to start pumping at28-30 lbs. should I lower the bladder pressure tank to 2lbs below the cut in at 28lbs as instructed by the tank manufacturer? EG lower the precharge to 26 on the pressure tank? thanks for any help.

  2. #2
    Moderator valveman's Avatar
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    Mar 2006
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    Lubbock, Texas
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    Default

    Quote Originally Posted by brenjake View Post
    should I lower the bladder pressure tank to 2lbs below the cut in at 28lbs as instructed by the tank manufacturer? EG lower the precharge to 26 on the pressure tank? thanks for any help.
    Yes, but with that baseball size tank it is not going to help much. When you decide you want a reliable pump, get a standard jet pump with a regular pressure switch and either a large pressure tank or a CSV and small tank.

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