Pentair VSF 3 GPM vs Speed

[JamesW]

They might have the wrong software loaded on the drive.

In any case, it seems like excessive pressure on the return or maybe a blockage on the suction or maybe the impeller is clogged.

 

[CarterM]

If we assume a pressure of about 15 due to the gauge being bad, the flow should be about 92 gpm.

The pressure and flow for 75% actually lines up better with the 1.5 HP model.

There was a different thread where the motor was mislabeled for the pump.

Maybe your system thinks that your pump is the 1.5 hp model.

Does the motor say 3.0 HP?


View attachment 628366____________________________________________________________________________________

View attachment 628381

Sell Sheet | IntelliFlo3 VSF Pool Pump

online.flippingbook.com

https://www.pentair.com/en-us/products/residential/pool-spa-equipment/pool-pumps/intelliflo3-vsf-po

http://

 

[CarterM]

Have you or a service person ever flocced the pool ?

Did you build the pool or Inherit after moving ?

How old are the carts ?

Pool has never been flocced.

I built the pool summer of 23'. Everything seemed to have been working fine until recently.

 

[JamesW]

We need an accurate pressure from a good pressure gauge.

In any case, the pump reported data indicates a serious restriction on the suction or return side or a clogged impeller.

Does the pump report system PSI?

 

[JamesW]

The pump monitors Total Dynamic Head, and not outlet pressure, so it may differ from the reading on the filter gauge.

The Intelliflo VSF shows system pressure, but I do not see how to get it on the Intelliflo3.

 

[JamesW]

https://www.pentair.com/content/dam/extranet/nam/pentair-pool/residential/pumps/intelliflo3-vsf/manuals/install-guide/intelliflo3-pro3-vsf-install-guide.pdf

 

[JamesW]

Check the cell again.

When the cell is off, look into the pipe to see if anything is stuck in this valve.

 

[JamesW]

Maybe check the impeller.

Something is off, just not sure what.

 

[CarterM]

Thank you everyone for the input! After pulling the filter apart and putting it back together, the numbers are a little better. My next step will be to check the valves and lines for blockage. I have a new pressure gauge ordered.

 

[JamesW]

Definitely better but still not good.

It implies a Total Dynamic Head of about 36 feet or 15.6 PSI, which is way too high for 24 gpm.

It puts you at about curve B when you should be close to curve D.

 

[wireform]

Make sure the diverter handles are properly oriented on the valve stem or else the the valve position isn't what you think it is. Open the diverter valves and inspect as I've seen a broken valve stem that didn't complete what the handle was telling it to do.

 

[JamesW]

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[ajw22]

After you get your PSI gauge replaced run your pump in GPM at 20, 40, 60 and record GPM, % speed, watts, PSI.

Then run your pump at 20%, 30%, 40%, 50%, 60%, 70% RPM and record GPM % speed, watts, filter PSI.

Post both data series.

 

[JamesW]

Change from % speed to RPM.

 

[ajw22]

Change from % speed to RPM.

All speeds in Intelliflo3 controls are refrenced in %.

Is there automation controlling this pump?

 

[CarterM]

I don't have any automation. I have schedules set to run in warmer months. I currently just have a winter schedule active that just has it running at 25 GPMs all the time. I am definitely open to suggestions in that department! I built pools for my dad from 4th grade (1994) until about 2008. I don't have a lot of experience with variable speed pumps, however. I did mostly construction and didn't do much after the install.

I will report back with data when I get my new pressure gauge. I will be opening the diverter valves up tonight and checking for debris.

 

[CarterM]

Update:

Finally got nice weather to work on the pump. Installed brand new filters and pressure gauge and everything went back to normal! My filters must have been completely clogged up with scale or something. They certainly did not look bad.

Thank you for all your help!

 

[ajw22]

Do a Overnight Chlorine Loss Test. If you fail the test you have algae that clogged your filter and need to follow the SLAM Process