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Thread: which 2 speed motor to replace 1 speed C48K2PA105

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    which 2 speed motor to replace 1 speed C48K2PA105

    I have a Sta Rite MPRA6E-147L (which is now obsolete: exact replacement a/c to Sta Rite website is MPRA6E-205L).

    My pump has a an AO Smith motor: #C48K2PA105 .

    I was wondering:
    1. What 230V 2 speed motor would be compatible
    2. Can this be a DIY thing? I am an engineer but of a more theoretical bent.
    3. Is it worth doing this? The pump might be 10 years old. The 2 speed replacement Pentair pump is about $400

    thank you for your time.
    Inground Concrete/Plaster Diving Pool, 17X30 ft, 20k gallons, 1 skimmer, 1 main drain, 5 returns,
    1 HP (SF 1.25) STARITE SINGLE SPEED, 2-Speed, 1 HP Pentair Superflo (not yet installed!) Hayward Sandfilter 3.14 ft.ft

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    bobodaclown's Avatar
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    Re: which 2 speed motor to replace 1 speed C48K2PA105

    Hello,

    If its 230V:
    UQS1102R or
    SQS1102R
    with those you'll need a hi/lo switch or timer.

    For the money I think this is a great deal:
    the EZ 2 Speed it comes with timer.
    https://www.americanbestpoolsupply.com/ ... 129176.htm

    I think your motor mount uses a rubber spacer, you can use a 46 or 56 motor.

    It is a DIY thing. You'll also need a new pump seal, they cost about $10 or so. Some local places will mount it for you for a small fee. Bring in your pump housing

    Heres some info from the 3/4 version: great-find-2ez-speed-75hp-square-flange-2-speed-300-t42909.html?hilit=ez2%20speed
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    linen's Avatar
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    Re: which 2 speed motor to replace 1 speed C48K2PA105

    bobo beat me, here are my thoughts:

    Quote Originally Posted by nealyak
    1. What 230V 2 speed motor would be compatible
    A.O. Smith UQS1102R (though the approach bobo suggested will work as well)

    Quote Originally Posted by nealyak
    2. Can this be a DIY thing? I am an engineer but of a more theoretical bent.
    Many people have done it on here. You will want a to replace the shaft seal and the gaskets at the same time.

    Quote Originally Posted by nealyak
    3. Is it worth doing this? The pump might be 10 years old. The 2 speed replacement Pentair pump is about $400
    If you current motor is on it's last legs? If yes then I would say replace it. If it is working fine, I would probably keep using it until it goes.

    I am seeing the 2-speed for about ~$260 from places such as: http://www.inyopools.com/Products/00...3528.htm#parts
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: which 2 speed motor to replace 1 speed C48K2PA105

    Thanks for the insight bobo and linen.

    I have to think about this a little more. It looks like the cost benefit is not really there... say $350 total for this motor and parts - compared to $410 for a new superflo dual speed

    In my case, I anyway have to replace the pipes to and from the pump since they are leaking. So I might just go for the new pump.
    Inground Concrete/Plaster Diving Pool, 17X30 ft, 20k gallons, 1 skimmer, 1 main drain, 5 returns,
    1 HP (SF 1.25) STARITE SINGLE SPEED, 2-Speed, 1 HP Pentair Superflo (not yet installed!) Hayward Sandfilter 3.14 ft.ft

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    linen's Avatar
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    Re: which 2 speed motor to replace 1 speed C48K2PA105

    I agree that the hp 2-speed superflo (340042 SF-N2-1A) should work for you and save a small amount of electricity as compared to the 2-speed replacement for your current pump. I would say it is more like $300 for replacement motor and parts...but still not a big difference.

    Your logic makes sense to me.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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