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Hot Water Pumps

D Jordan
D Jordan Member Posts: 2
in THE MAIN WALL
I have recently had a new home hot water heating system installed. Shortly after this, the pump went, so I replaced it with a Grundfos Type UP 15 - 42 F pump.

I have unstable power in the area where I live so I purchased a DC power pack and 140 watt inverter from the local hardware store so that I can run the pump when the power goes off.

The problem I have is that the pump whines and gets hot when I run it on the inverter. When hooked to house supply it runs normal.

Can anyone explain this and will it damage the pump??

Comments

  • scrook_2
    scrook_2 Member Posts: 610
    the inverter

    is producing a square shaped waveform, probably a "modified square wave" not a sinusoidal waveform. These are fine for resistive loads such as light bulbs and okay for universal moter equipped power tools such as power drills, but cause excessive heating in AC induction motors, as you are seeing. It will shorten the life of the motor, how much is hard to say though. One solution, though expensive, is to buy a sinusoidal output inverter such as an Exeltech http://www.exeltech.com/ another may be to keep a spare circulator on hand in case of failure.
  • D Jordan
    D Jordan Member Posts: 2


    holy ##...I guess things ain't so simple as my heating installer lead me to believe.

    Thanx for the info........Doug
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