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Thread: I think lightning fried my Intelliflo pump

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    I think lightning fried my Intelliflo pump

    I have a Pentair Intelliflo variable speed pump. It is 3 hp (I think) and has 4 speeds. I think lightning may have fried it the other night during a bad thunderstorm, I have an electrician checking it out today. If it is fried, I was thinking of going with a cheaper 2 speed pump and possibly lower hp. All we ever use is speed #2 (1800 rpm) and speed #3 (2300 rpm). If I bought a 1 1/2 hp pump with 2 speeds would the low speed be close to speed #2 on my Intelliflo? My pool is approx 22,000 gallons. Thanks

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    Re: I think lightning fried my Intelliflo pump

    If you have to replace the pump of not, add surge protectors. I have two, a larger Eaton Ultra ($110) at my main panel and a smaller Square D SDSA1175 ($25) at my pool sub panel.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: I think lightning fried my Intelliflo pump

    1800 RPM is not half of 2300 RPM so it wouldn't be possible to match flow rates exactly if that is what you are trying to do. You could come close to matching one speed or the other depending on what is more important. To match 2300 RPM at full speed, the Whisperflo 1/2 HP comes close. But then low speed would be about 40% lower than what 1800 RPM is now. However, you couldn't match the flow rate at 1800 RPM with a low speed of any pump except the one you have now (3 HP). But then at full speed it would be overkill.

    What are the two speeds used for?
    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 lightning fried my Intelliflo pump

    Quote Originally Posted by mas985 View Post
    1800 RPM is not half of 2300 RPM so it wouldn't be possible to match flow rates exactly if that is what you are trying to do. You could come close to matching one speed or the other depending on what is more important. To match 2300 RPM at full speed, the Whisperflo 1/2 HP comes close. But then low speed would be about 40% lower than what 1800 RPM is now. However, you couldn't match the flow rate at 1800 RPM with a low speed of any pump except the one you have now (3 HP). But then at full speed it would be overkill.

    What are the two speeds used for?
    RPM comparison between a VS 3HP pump and a 1.5hp speed pump is an irrelevant comparison. @ 2300 RPM a 3PH VS pump will move more water at an equivalent head than a 1.5hp operating at 2300 RPM. If you are trying to match a VS pump to a 2 spd you need to compare the pump performance curve for your existing pump to a possible replacement.
    Gunite Pool/Spa, CLI Caribbean blue crystal stone smooth, Pentair 3hp Intellifo VS, Pentair Quad DE Filter, Pentair 400k BTU Heater, KK Prowler 820, Pentair PSL4 controler with Screenlogic wifi, Inline Chlorinator, Pentair 1.5hp Spa Blower, TF-100 Test Kit w/ Speed Stir. My 2016 Pool Build

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    Re: I think lightning fried my Intelliflo pump

    BTW: a 3 hp Intelliflo has 8 available preset speeds. In addition there are the external control speeds and quick-clean speeds that can be set. It is basically infinitely variable in 5rpm increments. You may be only using 2 speeds, but you have a lot more programmability available to you.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: I think lightning fried my Intelliflo pump

    Quote Originally Posted by bradj View Post
    RPM comparison between a VS 3HP pump and a 1.5hp speed pump is an irrelevant comparison. @ 2300 RPM a 3PH VS pump will move more water at an equivalent head than a 1.5hp operating at 2300 RPM. If you are trying to match a VS pump to a 2 spd you need to compare the pump performance curve for your existing pump to a possible replacement.
    First I wasn't just comparing the Intelliflo to any 1.5 HP pump, I was comparing the Intelliflo to ALL the Whisperflo pumps because they use the same housing as the Intelliflo and the Intellfilo wet end can use any of the Whisperflo diffusers and impellers to replicate the same Whisperflo head curve. Second, I did use ALL the pump head curves AND a series of plumbing curves. So my comments are very relevant and very accurate. But if you need further proof, here was the analysis that I did:

    Plumbing Curve-C

    Intelliflo @ 3450 RPM -> 100 GPM
    Intelliflo @ 2300 RPM -> 67 GPM
    Intelliflo @ 1800 RPM -> 52 GPM
    Whisperflo 1/2 HP @ 3450 RPM -> 68 GPM
    Whisperflo 1/2 HP @ 1725 RPM -> 34 GPM

    So the Whisperflo 1/2 HP produces comparable flow rates as the Intelliflo at 2300 RPM. However, there is no Whisperflo pump that produces the same flow rate as the Intelliflo ON THE SAME PLUMBING at 1800 RPM. The flow rate is too low. However, the only Whsiperflo that will produce about 52 GPM at half speed (1725 RPM) would be the same wet as as the Intelliflo has now (3 HP) because the RPMs are about same (1800 RPM vs 1725 RPM). Capiche?

    The same holds true for the plumbing curve-A (albeit with lower flow rates across all pumps) and is fairly independent of plumbing curve so you don't really need to know anything about the OPs plumbing to make the comments that I did.
    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 lightning fried my Intelliflo pump

    Sorry mas, clicked the wrong reply to. Basically your comments echo my concerns. Don't go out and just buy a pump that has 2 RPm settings that come close to what you were using in a VS pump for a large HP size.
    Gunite Pool/Spa, CLI Caribbean blue crystal stone smooth, Pentair 3hp Intellifo VS, Pentair Quad DE Filter, Pentair 400k BTU Heater, KK Prowler 820, Pentair PSL4 controler with Screenlogic wifi, Inline Chlorinator, Pentair 1.5hp Spa Blower, TF-100 Test Kit w/ Speed Stir. My 2016 Pool Build

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    Re: I think lightning fried my Intelliflo pump

    Thanks for the info....If it's fried, I may just buy a small single speed 1/2 hp pump. They're cheap. The tech is coming out tomorrow to break the news. I'll keep yall updated.

    Question, about how many watts will a single speed 1/2 hp pump pull?

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    mas985's Avatar
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    Re: I think lightning fried my Intelliflo pump

    You don't really need to replace the entire pump. You can get the 1/2 HP Impeller and diffuser for a Whisperflo and put in the existing housing with a new motor. But it may end up costing about the same.

    A 1/2 HP Whisperflo will draw about 1200 watts. Low speed, if you choose to go that route, would be about 300 watts.
    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 lightning fried my Intelliflo pump

    i have done a lot of research in the last few hours and the pump i've decided to go with (if i have to buy a new one) is the Pentair Superflo 1hp 2 speed. Pentair 340042. Can I just buy the motor and bolt it to my intelliflo housing?

    How many watts will this pump pull on high and low speeds? Thanks

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    Re: I think lightning fried my Intelliflo pump

    or maybe the cheap Pentair Superflo 1/2 hp, Pentair 340036. How many watts will this pull? Will this push as much water as my intelliflo on #2 speed (1800 rpm)?

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    Re: I think lightning fried my Intelliflo pump

    You cannot mix SuperFlo and Intelliflo parts. The Intellifo is built from the Whisperflo wet end so it only uses the parts from the Whisperflo. If you want, you can just add a new motor to your existing Intelliflo wet end and also change the diffuser and impeller to effectively downsize the pump.

    Otherwise, you will need to replace the entire pump if you want to use the Superflo. If so, I would not go down below the Superflo 1 HP 2 speed. Otherwise, you may not have enough flow rate at high speed to match 2300 RPM of the Intelliflo (67 GPM).
    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 lightning fried my Intelliflo pump

    quick question....while my main pump is down can i run my booster pump and cleaner by itself to stir up the water a little. i think i remember the pool builder saying not to do that but don't understand why? thanks

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    Re: I think lightning fried my Intelliflo pump

    My PB told me the same thing. I have accidently done it and notice the booster makes loud noise! I believe I read that the booster pump needs that extra flow of the main pump to work. Do you have any other type of pump...waterfall, sump pump?
    8500 gallon IG Pebble Sheen with Spa. 3hp Pentair VS Intelliflo ( pool ), 3/4 hp WhisperFlo ( water feature ),Pentair Racer, 400K Pentair heater, Pentair 500sqft Cartridge filter, EasyTouch 8, Stenner 45mp2 15gallon wired to ET8

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    Re: I think lightning fried my Intelliflo pump

    Quote Originally Posted by brg88tx View Post
    quick question....while my main pump is down can i run my booster pump and cleaner by itself to stir up the water a little. i think i remember the pool builder saying not to do that but don't understand why? thanks
    If you run the booster without the main pump running, the pump will likely cavitate and damage the impeller because the water has to pass through the pump that is off causing a lot of head loss.
    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 lightning fried my Intelliflo pump

    i think i may just go with the single speed 1/2 hp whisperflo. are you sure the 1/2 hp whisperflo will give me the approx water movement of my intelliflo on level 3? it just seems weird going from a 3 hp to a 1/2 hp.

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    Re: I think lightning fried my Intelliflo pump

    The same flow as the Intelliflo at 2300 rpm.

    That is the equivalent of about a 0.8 THP pump using the affinity laws. The 1/2 hp Whisperflo has a THP of about 0.8 as well.
    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 lightning fried my Intelliflo pump

    You shouldn't run the Polaris without the main pump on. It's not a self priming pump. If there's any air in the line, it will run dry and get damaged. It can also suck water from the returns, which can introduce debris into the pump.

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    Re: I think lightning fried my Intelliflo pump

    ok, thanks for the input about the booster pump. i'm just worried about a green swamp while i wait for my pump. maybe i'll just walk around the pool and slowly pour in some bleach. btw, what's the going rate for a pump install? is there a problem with the wiring from an intelliflo to a single speed whisperflo?

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    Re: I think lightning fried my Intelliflo pump

    Add the bleach and then brush to mix. The wiring should be simple with no problems.

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