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Thread: Planning to install a variable speed pump

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    Planning to install a variable speed pump

    I have a Hayward Superpump, single speed and a Hayward H series gas heater with electronic ignition. I have a mechanical timer that turns off my heater and then, after a short delay, turns off the pump.

    I'm planning to buy a Pentair Superflo VS pump, model 342001. I would like to run the pump at slow speed at night to keep the water circulating. It will be below the minimum PSI for the heater.

    I realize if the pressure is too low, the heater's low pressure switch will trip and turn off the heater. But, should I be relying on this as a nightly "off switch" for the heater?

    Or, should I continue to use the mechanical timer to turn off the heater an hour before the VS pump goes into low mode?

    I'm just wondering if the low pressure switch is designed to be used in that fashion.
    Concrete (gunite) inground pool and spa (80,000 litres/21,000 gallons)
    Hayward H350 natural gas heater (electronic)
    Goldline Aquarite chlorine generator
    Hayward pumps, Hayward Pro Series sand filter, Goldline valve actuators

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    Mod Squad jblizzle's Avatar
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    Re: Planning to install a variable speed pump

    Just curious why you want to keep the water circulating at night? It will cost you money in power and may actually result in higher heat losses.
    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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    Re: Planning to install a variable speed pump

    Quote Originally Posted by jblizzle View Post
    Just curious why you want to keep the water circulating at night? It will cost you money in power and may actually result in higher heat losses.
    To keep the salt water chlorinator operating mainly. I understand it's not good to have the chlorinator on without water flow.
    Concrete (gunite) inground pool and spa (80,000 litres/21,000 gallons)
    Hayward H350 natural gas heater (electronic)
    Goldline Aquarite chlorine generator
    Hayward pumps, Hayward Pro Series sand filter, Goldline valve actuators

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    Mod Squad jblizzle's Avatar
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    Re: Planning to install a variable speed pump

    Are you saying the SWG needs to run that a VERY long time to keep your FC levels in range? That seems strange.
    What are your test results?

    How big is your pool? Add it to your signature.

    I realize I am drifting from your actual question, but what your are proposing does not seem like it should be required
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: Planning to install a variable speed pump

    Signature updated. The pool is closed (I live in Canada) so I don't have any readings.

    My SWG ran fine last summer and FC was at a good level even though I had no water running through the SWB for 8 hours at a time. So I'm sure the SWG does not need to be running 24 hours a day. But, I replaced the SWG module about 5 years into the pool and I don't want to do it again. I thought I read somewhere that having power to the SWG without running water through it hurts the longevity of the cell. Is that false?

    I reviewed the default program for the Pentair and it goes like this:

    2 hours - 3000rpm
    10 hours - 1400rpm
    2 hours - 2200rpm
    10 hours - stationary/paused

    So it appears that I had it wrong. I thought the second 10 hours was at low mode as well, not stationary/paused. So let me back up a bit and ask about that program. I assume that the 1400 rpm is not enough to bring my heater out of low mode. So the heater is only working during the 2 hours at 3000 and 2 hours at 2200. Does that seem like a good idea? The heater would be working at 100% during those times, I would think.
    Concrete (gunite) inground pool and spa (80,000 litres/21,000 gallons)
    Hayward H350 natural gas heater (electronic)
    Goldline Aquarite chlorine generator
    Hayward pumps, Hayward Pro Series sand filter, Goldline valve actuators

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    Mod Squad jblizzle's Avatar
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    Re: Planning to install a variable speed pump

    I guess I still fail to understand what you are trying to accomplish.

    You want to run the pump at the lowest speed for the shortest amount of time that you can while meeting all your needs.

    You will have to determine what speed allows the heater to run.
    You will have to determine what speed allows the SWG to generate.
    I would then make the lowest that allows both be your lowest speed setting.

    Running the heater for 4 hours split up like that seems like it would just be wasting energy since the heat will be lost.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Mod Squad pooldv's Avatar
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    Re: Planning to install a variable speed pump

    It is not necessary to have continuous water flow through the SWG. It will not shorten the life to have the pump off overnight. It is a good idea to have your SWG wired to a timer to be able to turn it off. My pump runs on a 12 -24 hour timer depending on the season and how busy my trees are, solar heat needs, etc. My SWG is wired to a time clock and usually runs 6-8 hours per day inside the pump run time.
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    Re: Planning to install a variable speed pump

    Quote Originally Posted by pooldv View Post
    It is not necessary to have continuous water flow through the SWG. It will not shorten the life to have the pump off overnight. It is a good idea to have your SWG wired to a timer to be able to turn it off. My pump runs on a 12 -24 hour timer depending on the season and how busy my trees are, solar heat needs, etc. My SWG is wired to a time clock and usually runs 6-8 hours per day inside the pump run time.
    Thanks for the input. What's the reason for shutting off the SWG?

    - - - Updated - - -

    Quote Originally Posted by pooldv View Post
    It is not necessary to have continuous water flow through the SWG. It will not shorten the life to have the pump off overnight. It is a good idea to have your SWG wired to a timer to be able to turn it off. My pump runs on a 12 -24 hour timer depending on the season and how busy my trees are, solar heat needs, etc. My SWG is wired to a time clock and usually runs 6-8 hours per day inside the pump run time.
    Thanks for the input. What's the reason for shutting off the SWG?
    Concrete (gunite) inground pool and spa (80,000 litres/21,000 gallons)
    Hayward H350 natural gas heater (electronic)
    Goldline Aquarite chlorine generator
    Hayward pumps, Hayward Pro Series sand filter, Goldline valve actuators

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    Mod Squad pooldv's Avatar
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    Re: Planning to install a variable speed pump

    It is for safety to eliminate risk of build up of chlorine gas.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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