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Thread: Another Over-sized Single Speed Pump

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    Join Date
    Sep 2015
    Location
    League City/TX
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    28

    Another Over-sized Single Speed Pump

    My new pool was supplied with a loud 1.5HP Tristar pump/motor combo that I believe is way overkill since I don't have a spa or waterfall feature (I only have a couple of bubblers for what it's worth). Can I change out the motor and salvage the new wet-end pump? Initially I was intrigued by the idea of water turnover in a couple hours with the oversized pump so I didn't complain much when the PB chose it. However, I did not take the sound levels into consideration and are now bugging me. I figure that for my 9.5K gal I could probably get by with a 3/4HP motor. Would that still be the case for a 2 speed motor? Which would be the recommendation if any? Thanks in advance!
    10,000 gal | In-Ground | White Plaster | Chlorine | Cartridge Filter | V-Green 165 VSP | Borated | Filled from City Water Source | TF-100 Test Kit | 4 Returns | 1 Suction Port | Jan 2016 Build

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    Re: Another Over-sized Single Speed Pump

    I really don't understand why builders constantly keep putting these ridiculously oversized pump on small pools. In my opinion, the only pump that should be installed on new construction is a variable speed. The new models are only slightly more money than a single speed or two speed. The variable speed pump will save money in the long run and is much quieter.

    Note: Quieter at low speed. Some vsp pump get loud at top speeds. Sometimes they get an annoying whine.

    I would suggest an aftermarket variable speed motor.

    Also, for new construction, an automation system can be a worthwhile investment. It provides timers for everything and it helps ensure that everything works together.

  3. Back To Top    #3

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    Re: Another Over-sized Single Speed Pump

    10,000 gal | In-Ground | White Plaster | Chlorine | Cartridge Filter | V-Green 165 VSP | Borated | Filled from City Water Source | TF-100 Test Kit | 4 Returns | 1 Suction Port | Jan 2016 Build

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    Re: Another Over-sized Single Speed Pump

    That should work as long as the total H.P of your existing pump is not more than 1.65. The total H.P is the nameplate H.P x the service factor. Most new motors have the total hp on a label. If your pump is more than 1.65 total hp, you could still use the motor. However, you would have to also replace the impeller.

    What is the model number of the pump?

    If you have a 1.5 hp full rated pump, it's actually a 2.4 total H.P pump and it can do 140 gpm, which would equate to about a one hour turnover (assuming low head loss).

  5. Back To Top    #5

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    Sep 2015
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    League City/TX
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    Re: Another Over-sized Single Speed Pump

    Yeah my pump is 1.65 THP. It's a 1.50 with a SF of 1.10 (Century SP3210Z1M). The Hayward pump number is SP3210X15 Pump-1 1/2 Hp Tristar. The motor is listed as Item # SPX3210Z1MR.
    10,000 gal | In-Ground | White Plaster | Chlorine | Cartridge Filter | V-Green 165 VSP | Borated | Filled from City Water Source | TF-100 Test Kit | 4 Returns | 1 Suction Port | Jan 2016 Build

  6. Back To Top    #6

    Re: Another Over-sized Single Speed Pump

    Ok, that motor will work. However, it doesn't have the best control interface. It only alows speed settings for set times. I think that you can get it to work with your timer, but it won't be as good as a motor with a proper timeclock.

    You should review the installation and operations manual to make sure that the control will work how you want it to.

    The vgreen 165 will accept outside control input. That might work. The vgreen 270 motor has a better interface control, but it's a lot more money. The 270 interface can be put on the 165, but that's probably more expensive.

    In my opinion, the builder should have installed a variable speed pump from the beginning.

  7. Back To Top    #7

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    Sep 2015
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    League City/TX
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    Re: Another Over-sized Single Speed Pump

    Thanks for the replies. It does seem a bit quirky, but I think it can do what I need it to do with not too much complication. Perhaps an upgrade for the user interface down the road once I get it past accounting...
    10,000 gal | In-Ground | White Plaster | Chlorine | Cartridge Filter | V-Green 165 VSP | Borated | Filled from City Water Source | TF-100 Test Kit | 4 Returns | 1 Suction Port | Jan 2016 Build

  8. Back To Top    #8

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    Sep 2015
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    League City/TX
    Posts
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    Re: Another Over-sized Single Speed Pump

    Installed the V-Green 165 today. The difference in noise emissions is remarkable! Now I just need to tweak the run times and rpms.
    10,000 gal | In-Ground | White Plaster | Chlorine | Cartridge Filter | V-Green 165 VSP | Borated | Filled from City Water Source | TF-100 Test Kit | 4 Returns | 1 Suction Port | Jan 2016 Build

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    Re: Another Over-sized Single Speed Pump

    Good job. You should be able to run at fairly low rpm. That will be quiet and efficient.

  10. Back To Top    #10

    Re: Another Over-sized Single Speed Pump

    Vela, how's the VGreen 165 working for you? I'm thinking of swapping out my oversized, dying motor (1.65 THP). You had the same motor as I do now (A.O. Smith/Century), only difference is the pump model. It seems like this is the only 1.65THP variable speed motor available for my old single speed pump.
    Viking Pool - Ceramic Fiberglass - Key West Sapphire Blue - 9,000 gallons
    Aqua Rite Goldline SWG
    Sta-Rite PXC150 Cartridge Filter
    Sta-Rite MPRA6F-148L 1.5 hp Pump

  11. Back To Top    #11

    Join Date
    Sep 2015
    Location
    League City/TX
    Posts
    28

    Re: Another Over-sized Single Speed Pump

    I am very pleased with it. Way quieter than my previous one (due to lower settings) and has all the controls I need. The controls are a bit quirky and do take some getting used to. I thought about buying the add-on user interface, but after learning and getting used to the factory ones, I don't need it or the added expense. I would definitely buy it again, but I hope I don't have to for a very long time.
    10,000 gal | In-Ground | White Plaster | Chlorine | Cartridge Filter | V-Green 165 VSP | Borated | Filled from City Water Source | TF-100 Test Kit | 4 Returns | 1 Suction Port | Jan 2016 Build

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