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Pump Noise

Bryan_16
Bryan_16 Member Posts: 262
Ground loop side of geothermal heat pump. Mounted 2 PL30's with unistrut and clamps like normal. Pumps hum and vibrate through entire house. Never had trouble before now with this type of mounting. Anybody have any ideas?

Comments

  • Dale
    Dale Member Posts: 1,317
    How's the velocity

    Have you choked down the output to see if it improves, perhaps the head is too low on this job. Easiest to swap pumps to eliminate that variable.
  • hot_rod
    hot_rod Member Posts: 15,042
    A notoriously noisy

    pump, those Pl series! I have removed quite a few and replaced with wet rotor types.

    That pump has an open frame motor, which helps them run a bit cooler, and reduces the drag imposed by spinning a rotor in the system fluid. All good ideas! Also less expensive than wet rotor motors to produce.

    The trade off is noise. The very early ones were really bad, they have quieted them down some. A good, well priced pump for high head applications in mechanical rooms where noise isn't a concern.

    Not a good match for wall mounted residential applications, in my opinion, that solid mount will transmit bearing and fan noise through the house like a drum.

    Iso Zorps unistrut clamps may help, but not much.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Bryan_16
    Bryan_16 Member Posts: 262
    thabks

    > pump, those Pl series! I have removed quite a

    > few and replaced with wet rotor types.

    >

    > That

    > pump has an open frame motor, which helps them

    > run a bit cooler, and reduces the drag imposed by

    > spinning a rotor in the system fluid. All good

    > ideas! Also less expensive than wet rotor motors

    > to produce.

    >

    > The trade off is noise. The

    > very early ones were really bad, they have

    > quieted them down some. A good, well priced pump

    > for high head applications in mechanical rooms

    > where noise isn't a concern.

    >

    > Not a good match

    > for wall mounted residential applications, in my

    > opinion, that solid mount will transmit bearing

    > and fan noise through the house like a

    > drum.

    >

    > Iso Zorps unistrut clamps may help, but

    > not much.

    >

    > hot rod



  • Bryan_16
    Bryan_16 Member Posts: 262
    thabks

    > pump, those Pl series! I have removed quite a

    > few and replaced with wet rotor types.

    >

    > That

    > pump has an open frame motor, which helps them

    > run a bit cooler, and reduces the drag imposed by

    > spinning a rotor in the system fluid. All good

    > ideas! Also less expensive than wet rotor motors

    > to produce.

    >

    > The trade off is noise. The

    > very early ones were really bad, they have

    > quieted them down some. A good, well priced pump

    > for high head applications in mechanical rooms

    > where noise isn't a concern.

    >

    > Not a good match

    > for wall mounted residential applications, in my

    > opinion, that solid mount will transmit bearing

    > and fan noise through the house like a

    > drum.

    >

    > Iso Zorps unistrut clamps may help, but

    > not much.

    >

    > hot rod



  • Bryan_16
    Bryan_16 Member Posts: 262
    thanks

    for the help. I normally use Grundfoss 26-96, but got bit by the $. Will end up changing the pumps. Choking off the discharge makes no difference.
This discussion has been closed.