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Thread: Pump Switch Electrical Capacity

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    Pump Switch Electrical Capacity

    Needed to replace the two speed power switch on my Hayward two speed pump on a cartridge filter for an above ground pool - the pump is rated at 14.5 /3.3 amps IIRC, and spends 24/7 on the low speed setting. Could not easily find a SPDT switch rated for 20 amps that would fit under the motor switch cover, so I replaced the switch with a SPDT rated at 10 amps on 120 volts.

    At the same time, I replaced the electrical cord running to this pump - former owner had used 75 feet of 16 gauge cord, I replaced that with 50 feet of 12 gauge and 8 feet of 14 gauge. the old cord woud actually get warm if the pump was run on the high setting for more than a few minutes.

    Now, the pump seems to run much warmer on the low setting - almost too warm to touch. On high setting, the thermal switch cuts the motor out after about 2 minutes, then it resets after cooling a bit.

    This is an AO Smith motor that is likely 8 or so years old - it has been trouble free for the 5 summers I have run it. since it is obviously running hotter than it has previously, could the lower-rated switch be a culprit? Obviously voltage issues are the most common reason for hot running motors, but I thought I had bypassed that when upsizing the feed line.

    Happy to find this forum, and I appreciate the feedback!

    Scott
    24 foot AG Vinyl, 10 year old wall, 1 year old liner
    Hayward 240T Sand (free!)
    Hayward 1.5 hp pump (free)
    BBB just ROCKS!

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    JasonLion's Avatar
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    May 2007
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    Re: Pump Switch Electrical Capacity

    This switch should work. Sorry, but I can't help with the overheating.
    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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    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    Re: Pump Switch Electrical Capacity

    When you replaced the switch you didn't inadvertently block some of the vent holes did you? that would cause it to run warmer.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Pump Switch Electrical Capacity

    cooling vents are clear, motor shaft spins easily, cartridge filter is running with almost no backpressure (2 psi on low, 8 psi in high) but the motor is still running very much warmer than last year - even on a 65 degree day it will only run on high for about 2 minutes before the hot cutout.

    In the past 4 summers it would run for hours at a time on hi speed with no issues.

    the only thing I have changed is the speed switch - there are two hot and one common wires connected to it - when I first reassembled it I must have mixed up the wires because neither position worked, so i swapped two and the motor ran. The switch does not get warm when the motor runs, neither does the power cord.

    I suppose I should just be happy is runs OK on low - a new two speed motor is a lot of $$$, and I do so much like that 390 watts on low, even if it does run 24/7........
    24 foot AG Vinyl, 10 year old wall, 1 year old liner
    Hayward 240T Sand (free!)
    Hayward 1.5 hp pump (free)
    BBB just ROCKS!

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