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Thread: I think the low setting on my 2 speed pump isn't enough

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    I think the low setting on my 2 speed pump isn't enough

    So, I finally wired up the 2 speed relay for my pump. Messed around with it this weekend running both low speed and high speed. It seems like low speed isn't adequate. observations;

    - When running, there's a big air cavity in the filter area of the pump intake, which tells me either not enough water is coming in or too much is leaving to keep things in balance.
    - Water is coming in, but barely any is coming out of the returns when I put my hand over them.
    - Water flowing into skimmer baskets (2) is barely moving.

    I am not using solar when testing and the de filter has recently been backwashed. For solar I can have my suntouch switch the pump to high speed. I'm a little surprised that low speed is so lame. Do others run into this where they can't use low speed?

    Having a VS pump would give solve this, just not in the budget now.

    Thanks-
    Kevin
    16x32 Concrete IG 24k Gallons
    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

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    Re: I think the low setting on my 2 speed pump isn't enough

    I think you are stuck. Low is Low. Air appearing in the pump basket lid on low is common. Does the air go away when you switch to high?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: I think the low setting on my 2 speed pump isn't enough

    It's common to have air in the pump strainer basket when running the pump on low speed. Unless there's air building up in the filter and/or coming out the returns, I wouldn't worry too much about it.

    How many returns do you have?
    What size are the return eyeballs?

    I see that you have replaced the motor on your pump with a smaller 2-speed one. What is the service factor on the old and new motors?
    Did you also replace the impeller with the recommended model for that motor?
    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
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: I think the low setting on my 2 speed pump isn't enough

    Quote Originally Posted by duraleigh View Post
    I think you are stuck. Low is Low. Air appearing in the pump basket lid on low is common. Does the air go away when you switch to high?
    Yeah, it does. That's what caught my attention at first. Surprising thing is my equipment is only 15 feet from the pool, and pretty much at the same elevation. I guess if I had a higher HP pump this wouldn't happen. But then my pump would be too powerfull on high when running solar or the booster pump.
    16x32 Concrete IG 24k Gallons
    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

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    Re: I think the low setting on my 2 speed pump isn't enough

    Quote Originally Posted by Bama Rambler View Post
    It's common to have air in the pump strainer basket when running the pump on low speed. Unless there's air building up in the filter and/or coming out the returns, I wouldn't worry too much about it.

    How many returns do you have?
    What size are the return eyeballs?

    I see that you have replaced the motor on your pump with a smaller 2-speed one. What is the service factor on the old and new motors?
    Did you also replace the impeller with the recommended model for that motor?

    When you say you wouldn't worry about it, does that mean to use the low speed? If low isn't really helping to keep the surface skimmed, and it won't run when the solar valve is open, then maybe I'm better off not using it.

    2 returns.
    No eyeballs, haven't used them in a couple years. But 1-1/2".
    I'm not sure about the old motor, its' long gone, but the new motor is 3/4hp, with a 1.5 sf and total of 1.13hp. That's coming from the label on the pump. If I had to guess, the old motor was 1hp, and I replaced it with a slightly lower HP because of the service factor.
    I did not replace the impeller. Whats the side effect if you don't? That may be playing into things.
    16x32 Concrete IG 24k Gallons
    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

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    Mod Squad Jimrahbe's Avatar
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    Re: I think the low setting on my 2 speed pump isn't enough

    K,

    That is why they invented the variable speed pump...

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

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    Re: I think the low setting on my 2 speed pump isn't enough

    Some questions:

    Quote Originally Posted by kevreh View Post
    - When running, there's a big air cavity in the filter area of the pump intake, which tells me either not enough water is coming in or too much is leaving to keep things in balance.
    Is there air at the start of the low speed cycle or does it develop over time?


    - Water is coming in, but barely any is coming out of the returns when I put my hand over them.
    What is the filter PSI on high speed and then low speed?


    - Water flowing into skimmer baskets (2) is barely moving.
    Is water traveling over the weir door or around the sides? I have a 1/2 HP pump and on low speed the water just barely goes over the top of the weir door in both skimmers.

    What is the Hayward pump line (e.g. 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

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    Re: I think the low setting on my 2 speed pump isn't enough

    Quote Originally Posted by mas985 View Post
    Some questions:

    Is there air at the start of the low speed cycle or does it develop over time?
    Once the pump switches from high to low it takes a good 10 minutes to fill with air. On that note I went out to watch the pump cycle from high to low and did notice there's air bubbles coming into the pump. Its just less noticable at high speed. So airs getting in somehow, maybe the union leading to the pump or one of the jandy 3 ways or something leading to the pump.


    What is the filter PSI on high speed and then low speed?
    High- 15psi, Low- 2psi.

    Is water traveling over the weir door or around the sides? I have a 1/2 HP pump and on low speed the water just barely goes over the top of the weir door in both skimmers.

    What is the Hayward pump line (e.g. SuperPump)?
    It is going over the door, slightly. Its an AO Smith two speed motor and Hayward pump body (sp2607x10).
    16x32 Concrete IG 24k Gallons
    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

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    Re: I think the low setting on my 2 speed pump isn't enough

    It sounds like the flow rate is sufficient. Just keep in mind that clearing the surface will take longer than high speed.

    But it also sounds like an air leak. The union is a good place to start. The pump lid is another place to look.
    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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    Re: I think the low setting on my 2 speed pump isn't enough

    Good idea on the pump lid. The gasket is getting a little worn, I'm sure its a $5 item or something.
    16x32 Concrete IG 24k Gallons
    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

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    Re: I think the low setting on my 2 speed pump isn't enough

    No eyeballs, haven't used them in a couple years. But 1-1/2".
    Well, that is a big pressure drop. Put the eyeballs back (3/4 or 1/2) and you will see an increase in pressure and surface flow. Why aren't you using them?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: I think the low setting on my 2 speed pump isn't enough

    Quote Originally Posted by duraleigh View Post
    Well, that is a big pressure drop. Put the eyeballs back (3/4 or 1/2) and you will see an increase in pressure and surface flow. Why aren't you using them?
    Every year I would take them out so I could plug the returns, and eventually I noticed the surface stayed clean without them. So why bother. But your right, with the low pump pressure the smaller diameter of the eyeball should make a difference. Thanks for pointing that out. I love this forum.
    16x32 Concrete IG 24k Gallons
    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

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