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Thread: Need pump replacement help

  1. Back To Top    #1

    Join Date
    Jun 2009
    Location
    Boston, MA
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    5

    Need pump replacement help

    Hi,

    I want to replace my old single speed pump with a 2 speed pump, but I'm having a hard time figuring out which pump to get. any help would be appreciated.

    Here are my specifics:
    - Pool size: 20x40 (approx 34,500 gal)
    - Plumbing: 1.5" PVC lines
    - Filter: Hayward S-240 sand filter (designed flow rate 63 GPM, clean PSI - 12)
    - Pump: Hayward Super Pump SP2607X10 (1 HP, 1.1 Service Factor)
    - Total Dynamic Head: 35 ft (calculated using a vacuum gauge and the filter's clean PSI)
    - No spa, heater, or other features

    Looking at the flow vs head curves for the pump, it's operating at 60 GPM @ 35 ft of head. So it takes 9.6 hrs for one turn of the pool water.

    My questions:

    1) This may be a stupid question, but when I look at the flow vs head curves for the 2 speed Super Pumps, they only show the curve for the low speed. I don't understand why the high speed curve is not shown?

    2) If I get a 2 speed pump that operates at 60 GPM on high speed, is the low speed half of the high speed? So that would be 30 GPM? Or is that too simplistic and it depends on the head, speed, etc?

    3) Any pump recommendations? I would like a manual switch to switch between high and low speeds (for vacuuming)

    Thanks in advance.
    Inground vinyl pool (20' x 40' - 30,000 gals)
    Hayward S240 sand filter

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
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    Re: Need pump replacement help

    1. Not sure, never looked, but the high speed curve is the same as the single speed curve.
    2. Low speed does in fact move about 1/2 the amount of water as high speed ... while using 1/4 the electricity.
    3. Why not just get the equivalent 2-speed motor to put on your existing pump? Would be cheaper, no need to do any plumbing. You can either get a switch that mounts on the motor or use a standard 3-way house light switch up by the timer or something.

    BTW, Turn over does not matter. Check out: Determine Pump Run Time
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  3. Back To Top    #3
    bobodaclown's Avatar
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    Re: Need pump replacement help

    X2 what Jason said.

    I'm pretty sure this one will work (if your running 230V): http://www.lockewell.com/index.php?m...5f17ba009b3143
    (Looking for a 2 speed 1hp c flange pump motor.

    Call and ask about a switch and replace the shaft seal.

    for 2-speed motors you have to specify 115V or 230V.
    Last edited by bobodaclown; 05-08-2015 at 12:10 PM. Reason: voltage clarification.
    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

  4. Back To Top    #4

    Join Date
    Jun 2009
    Location
    Boston, MA
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    Re: Need pump replacement help

    Thanks for the advice. Just getting the motor would definitely be cheaper.

    Will any 2 speed 1-hp pump work? or are there specific models that fit the Super Pump?

    BTW - I currently have 115V but could hook up 230V if needed.
    Inground vinyl pool (20' x 40' - 30,000 gals)
    Hayward S240 sand filter

  5. Back To Top    #5
    mas985's Avatar
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    Re: Need pump replacement help

    No and yes. You need to get the appropriate motor and that would be a STS1072RV1 but it is a 230v motor. You can use a B973 (115v) but it requires modification of the motor stand.
    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

  6. Back To Top    #6

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    Re: Need pump replacement help

    Reading other threads, I'm leaning towards the B973T (with the integrated timer). I also plan on picking up a new motor stand and Go Kit. Make sense?

    Thanks for the help.
    Inground vinyl pool (20' x 40' - 30,000 gals)
    Hayward S240 sand filter

  7. Back To Top    #7
    mas985's Avatar
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    Re: Need pump replacement help

    Sure
    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

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