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Thread: 1.5hp Pentair Superflo VS Pump motor DOA??

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    1.5hp Pentair Superflo VS Pump motor DOA??

    I spent about 6 hours yesterday plumbing new filter and pump/motor. At the end was excited to fire it up and check for leaks etc. However, I flipped the switch to the pump and nothing. Not even a green light on the VS panel or a fault light. SO.. I open up connection panel on motor and verify 120/118 line voltage to the connection lugs A and B and that insulated ground is connected. The bonding wire to pool is connected as well. I held Start button on VS panel for 10 seconds along with a couple others too. I find it hard to believe that the thing is completely dead new out of the box. Am I missing something simple? Looking for ideas from the more experienced before I have to deal with warranty people at Pentair.
    28500gal 20'x40' IG Plaster; Pentair CC Plus 420 Cartridge; Pentair SuperFlo Variable Speed 1.5hp

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    JasonLion's Avatar
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    Re: 1.5hp Pentair Superflo VS Pump motor DOA??

    Welcome to TFP!

    The SuperFlo VS requires 230 volts. You want to measure something between 220 and 250 between lugs A and B at the pump.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: 1.5hp Pentair Superflo VS Pump motor DOA??

    What I meant by 118/120 was one lug is 118 and the other is 120 = 238volts to motor
    28500gal 20'x40' IG Plaster; Pentair CC Plus 420 Cartridge; Pentair SuperFlo Variable Speed 1.5hp

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    Re: 1.5hp Pentair Superflo VS Pump motor DOA??

    28500gal 20'x40' IG Plaster; Pentair CC Plus 420 Cartridge; Pentair SuperFlo Variable Speed 1.5hp

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    Re: 1.5hp Pentair Superflo VS Pump motor DOA??

    As Jason mentioned, you need to verify 240 to the motor. This requires that you probe both of the hot leads at the same time. I am going to assume that you are replacing a 240 volt pump with a 240 volt pump and nothing was changed elsewhere in the wiring.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    JasonLion's Avatar
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    Re: 1.5hp Pentair Superflo VS Pump motor DOA??

    Just to add some detail to what danpik already said, test the voltage between the two hot lugs as well, instead of just each separately to ground. That will confirm that they are two different phases and you really have 238 volts present. It is quite unlikely that this would be wrong, but given that the pump is not working, it is definitely worth testing.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: 1.5hp Pentair Superflo VS Pump motor DOA??

    Good news! 2.475 volts between hot lines at motor and 240 volts at breaker. I saw the Red, Black, and green wire and assumed 240v off the bat. Narrowed things down a bit and thanks to both of you.
    28500gal 20'x40' IG Plaster; Pentair CC Plus 420 Cartridge; Pentair SuperFlo Variable Speed 1.5hp

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    Re: 1.5hp Pentair Superflo VS Pump motor DOA??

    Followed 240v problem to a 4way switch before the pump motor. I think that one could only switch one leg of a 240v circuit and the other would still be live which doesn't seem safe so I am going to put a cover plate on the box and remove the switch. Will use the time clock to switch off the pump. Whomever installed the switch has input top right black and red left, and output bottom right black and left red. I seem to remember 4 way switches cross the poles so maybe that's why the voltage is in phase from the switch to pump or am I wrong in this assumption? (FYI I j just bought the house in November and crazy stuff like this is everywhere.)
    28500gal 20'x40' IG Plaster; Pentair CC Plus 420 Cartridge; Pentair SuperFlo Variable Speed 1.5hp

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    TFP Guide

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    Re: 1.5hp Pentair Superflo VS Pump motor DOA??

    It may not be a 4 way switch. It may be a double pole single throw switch. A 4 way would only ever allow one leg at a time to be powered. If it is a DPST switch it could be one contact is bad.
    I the past switching one side of a 240 circuit was done. As you mentioned it is not the safest way to do it.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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