Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: My new 2 speed Century replacement motor

  1. Back To Top    #1

    In the Industry
    kevreh's Avatar
    Join Date
    Jun 2007
    Location
    Annandale, VA
    Posts
    398

    My new 2 speed Century replacement motor

    I made the plunge and decided to replace my 1hp Hayward Superpump motor (single speed) with this AO Smith/Century motor. So far looks like a good move, as this motor seems to be made so much better than the motor that came with the pump (another AO Smith, but like a lot of things I suspect a replacement motor is in a different class than an 'OEM' motor attached to pumps being sold).

    Interesting is the lack of paint on the ends of the motor, which differs from the pictures you see online. I called the manufacturer and found that the metal is aluminum, so it shouldn't rust. Apparently they had problems with paint staying on the aluminum and decided to avoid it altogether.

    Also interesting is that the motor is 3/4 HP full rated but according to the sticker its actually 1.13 HP.

    This motor is an inch or so fatter than the original motor, so I had to trim the based that the motor sits on.
    Attached Images Attached Images
    16x32 Concrete IG
    Equipment: Carvin 525sf Cartridge Filter, Jandy Gas Heater, Vortex Solar Panels w/solar valve, 1hp Hayward Pump with 3/4 HP AO Smith 2 Speed Replacement Motor, Aquarite Saltwater Cell, Polaris 280 Dolphin Active 20 Robot
    Automation: Hayward Prologic Controller

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,478

    Re: My new 2 speed Century replacement motor

    The sticker is showing the Total HP which is different than the label HP. So the total HP = Label HP (0.75) * Service Factor (1.5) = 1.125 which is rounded to 1.13. The "True" HP is the total HP and that is what should be used when sizing a motor. As long as that is larger than the previous motor's THP, then it should work fine.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: My new 2 speed Century replacement motor

    Which model motor did you purchase?
    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.

  4. Back To Top    #4
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,478

    Re: My new 2 speed Century replacement motor

    Yea, that looks to be the wrong frame for a Superpump.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  5. Back To Top    #5

    In the Industry
    kevreh's Avatar
    Join Date
    Jun 2007
    Location
    Annandale, VA
    Posts
    398

    Re: My new 2 speed Century replacement motor

    Quote Originally Posted by linen
    Which model motor did you purchase?

    B973

    The service factor on the old motor was 1.1. So 1.1*1 = 1.1. Pretty much an exact match to this new one. Except this one is rated at 11.2amps for the high speed and 5amps low (the old motor was 15amps). So a little bit of amperage savings there.
    16x32 Concrete IG
    Equipment: Carvin 525sf Cartridge Filter, Jandy Gas Heater, Vortex Solar Panels w/solar valve, 1hp Hayward Pump with 3/4 HP AO Smith 2 Speed Replacement Motor, Aquarite Saltwater Cell, Polaris 280 Dolphin Active 20 Robot
    Automation: Hayward Prologic Controller

  6. Back To Top    #6

    In the Industry
    kevreh's Avatar
    Join Date
    Jun 2007
    Location
    Annandale, VA
    Posts
    398

    Re: My new 2 speed Century replacement motor

    Quote Originally Posted by mas985
    Yea, that looks to be the wrong frame for a Superpump.

    It was easy to trim the plastic footing with my jigsaw. Trimmed all of 3/8". Sits fine now. Mark, any chance you could chime in on the thread I started (questions-for-mark-t58906.html) that had a few questions for you, even though its sort of irrelevent now since I bought the new motor. I was most interested in how you can "get away" with using a 1/2HP motor considering your pool size, 2nd story solar panel, etc....
    16x32 Concrete IG
    Equipment: Carvin 525sf Cartridge Filter, Jandy Gas Heater, Vortex Solar Panels w/solar valve, 1hp Hayward Pump with 3/4 HP AO Smith 2 Speed Replacement Motor, Aquarite Saltwater Cell, Polaris 280 Dolphin Active 20 Robot
    Automation: Hayward Prologic Controller

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •