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Thread: Upgrading single speed Super Pump to 2-speed or VS

  1. Back To Top    #1

    Join Date
    Sep 2014
    Ottawa, Ontario, Canada

    Upgrading single speed Super Pump to 2-speed or VS

    Objective: To minimize electricity cost while maintaining a daily turnover of at least 2.0.

    Present situation: My equipment is described in my signature below.
    My intent is to keep the Hayward Super Pump and replace just the 1 HP motor with an appropriate 2-speed or VS motor.

    Using the guidance found in Pool Pump Sizing, I determined the Total Head Loss for my present setup and a corresponding flow rates for Super Pump.
    (a) w/o Solar heating: Total Head Loss 38 ft Flow rate 54 GPM at 3450 RPM; 27 GPM at 1725 RPM
    (b) with Solar heating: Total Head Loss 50 ft Flow rate 39 GPM at 3450 RPM; 19.5 at 1725 RPM

    Assumption: 14 hrs operation w/o Solar, pump at 1725 RPM; 10 hrs operation with Solar, pump at 3450 RPM.

    Upgrade option A: Use existing Super Pump with a 2-speed 1 HP motor
    Using the above numbers I calculated the daily turnover.
    14 h x 27 GPM x 60 min. = 22680 gal and 10 h x 39 GPM x 60 min. = 23400 gal
    24 h total = 46080 gal Daily turnover = 46080 : 21000 = 2.2

    I'd be grateful for comments, suggestions of other options and motor suppliers.
    21K gal, IG plaster new 2010, 3/4 HP Super Pump with 2-speed AO Smith motor w/integrated 2Green timer, sand filter S-244T2, solar heating with HM-4000D controller, Dolphin M400 pool cleaner.

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: Upgrading single speed Super Pump to 2-speed or VS

    Turnover per day is relatively meaningless.

    Pool School - Determine Pump Run Time
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
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