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Thread: Hayward NorthStar converted to 2 Speed - Very Low Filter PSI

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    Hayward NorthStar converted to 2 Speed - Very Low Filter PSI

    My mother lives in Texas and I am in NY. She called today and her pump motor won't run. The breaker is on and I had her test for current at the timer box and then also test the pump side of the timer with the timer in the on position.

    I would like to replace her motor with a 2 speed.
    This is the information she gave me off the phone:
    Hayward Northstar
    AO Smith Centurion 1081
    1.5 HP/ Service factor=1.25
    Amps SF8.5-7.8/15.6

    Her pool:
    32,000 gallon in ground, fiber glassed recently. She had the only drain closed off last year since it was leaking. One skimmer and one fountain (was a spa but she had the bottom 4 feet filled in and now it's a fountain). She has a DE filter and a booster pump for the Polaris. 2 inch plumbing.

    She is wired for 230 at the timer box. I'm hoping my brother (OK mechanically inclined) can change the motor and pump seal to save her some money. Can someone please tell me if I can get a 2 speed motor to replace the old single speed, if not, recommendations on a new pump would be appreciated.

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Hayward NorthStar/AO Smith-Centurion covert to 2 Speed

    Yes, you can replace the motor with a 2 speed. The STS1152R should work for you.
    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

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    Re: Hayward NorthStar/AO Smith-Centurion covert to 2 Speed

    The supplier I talked to said she will need to replace the timer as well in order for the two speed pump to move between low and high speed, is this correct? Does any pump come with a switch on the motor to move from low to high speed?

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    Join Date
    Jun 2007
    New Jersey

    Re: Hayward NorthStar/AO Smith-Centurion covert to 2 Speed

    I recently did the 2-speed conversion on my Pentair WhisperFlo. I did not see any motors with the switch built-in, although A.O. Smith does have a series of 2-speed motors with the timer built-in. I figured it was too expensive to go that route compared to the stand-alone. I added a $5 switch from Grainger with a rubber boot and installed it on the side of my timer case. Then I just ran one additional conductor through the conduit to the motor. The back of my pump is in an inconvenient place so this made the most sense for me and was the cheapest way to go.
    Current: 28,000G 18'x36' I/G AnthonySylvan Plaster; Waterway 60 sq.ft. DE Filter; 1.0hp x 1.65 SF Two-Speed (B2982) WhisperFlo; 2004-Present
    Previous: 40,000G 20'x40' I/G Koven unlined WWII salvage 5/8" marine steel; Lomart Stainless Sand Filter; 3/4hp Hayward SuperPump; 1946-2003 (managed by me from about 1964)
    Ancient Taylor K-2000, upgraded with Taylor CH, TA, and FAS-DPD, and TFT CYA tests.

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    Re: Hayward NorthStar/2 Speed Conversion - Low Filter PSI

    My brother called yesterday he has the new pump installed using a 3 way switch for high/low. My mother called me this morning concerned that her filter pressure is sitting at zero when the pump is on low speed. To recap:

    Installed new motor STS1152R in the Hayward Northstar pump
    Filter is a Pentair Nautilus Plus NSP60
    Plumbing is 1 1/2 inch
    pool capacity = 30,280 a gunite pool that was coated with fiber glass two years ago. Single bottom drain was closed off when the pool was fiber glassed due to a leak. One skimmer basket in the deep end of the pool, farthest from the filter.

    I read this thread: so I feel a little better but just want to be sure Mom's filter/pump setup is right for her pool.

    When the pump is on high, psi=9, 1 psi less than her old 1 speed pump. If such a low pressure in the filter is normal, will filtering be degraded due to the low pressure? I have a sand filter so don't know much about DE.

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Hayward NorthStar converted to 2 Speed - Very Low Filter

    Actually the opposite. The pressure being lower means that the water is moving slower through the filter media and therefore it filters better. And that's true for all types of filters.
    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
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