Intelliflo3 3hp low pressure

[PoolStored]

Why are you trying to push so much water? The beauty of the VSP is that you can run it on low speed. I can run about 150-170W and 1400rpm 24/7, make chlorine and filter. If I want to heat, I need 35GPM for the gas heater, I can get that at 2200RPM.

There is no need to run so high.

 

[ajw22]

Ok changed everything to RPM's. Looks better running it @ 100% rpm, but I expected more pressure and gpm
Not a big deal, but shouldn't this pump be able to push more?

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You have an IFCS that gives a lot of resistance or "head" to the flow.

What are the pressures at 80% versus 100%?

As you can see the pump flow is maxed out at 80% and you gain no additional flow at 100%.

It would be interesting seeing your flow curve and pressures if you post the data at 50%, 60%, 70%, 80%, 90% and 100%.

Do you have skimmers and returns and can turn off your IFCS?

@proavia @mas985 may have thoughts.

 

[Ed Blown Vert]

I only ran it at 100% to see how it compared to my old pump. (And when I run my In-Floors or when vacuuming.) I really expected with the extra HP it could push alot more. Which in turn would push more at lower rpm's. I ran it last night @ 1200 rpm's. Didn't seem like it was pushing any water or skimming. My Pop-Ups barely cycled. Honestly I don't know what to expect. This is my first pool and my first VSP.

 

[ajw22]

I really expected with the extra HP it could push alot more. Which in turn would push more at lower rpm's.

Raw HP alone will not force more water through a small hole. That is effectively what you have with your pool plumbing and IFCS.

I ran it last night @ 1200 rpm's. Didn't seem like it was pushing any water or skimming. My Pop-Ups barely cycled.

Why do want to push more water?

What problem are you looking to fix?

Now that you have this new tool with the variable speeds you need to experiment and find which speeds work best for your setup.

What speeds gets the IFCS pop ups to clean effectively and skim the pool?

 

[mas985]

Because of the high head loss in the IFCS, the two pumps are going to produce about the same head loss. If you look at Curve-A in the chart below, the flow rates are nearly identical between the two pumps at full speed. Even with Curve-C which has much less head loss (i.e. IFCS bypassed), the flow rate difference is not all that great (~2.5GPM).

THP is a very poor predictor of pump performance.

 

[proavia]

You need to determine what RPM and runtime is required to get a satisfactory clean from the IFCS.
Any additional runtime can be at a low RPM.

Don't expect to run at 1200 RPM and see debris getting sucked into the skimmer quickly. Chances are the debris will eventually getinto the skimmer. But if you stand there and watch it, you willbe disappointed.

I run at 2900 RPM for two 2 hour cycles for my IFCS.
The rest of my runtime is at 1200 RPM - which procides a bit of skimming and also satisfies my SWG flow switch.

Every pool is different. You need to find what works for you.

 

[Ed Blown Vert]

Because of the high head loss in the IFCS, the two pumps are going to produce about the same head loss. If you look at Curve-A in the chart below, the flow rates are nearly identical between the two pumps at full speed. Even with Curve-C which has much less head loss (i.e. IFCS bypassed), the flow rate difference is not all that great (~2.5GPM).

THP is a very poor predictor of pump performance.

Thanks for this, now it makes more sense. I spent alot of $$$ for this pump. Just wanted to make sure it was working as expected.
I will play with RPM's and runtime and find what works best. Thanks everyone.

 

[ajw22]

Try 70%. I think this is telling you that you get the maximum flow at 70% and 65 GPM and running the pump higher then that the efficiency drops and you get less flow.

 

[Ed Blown Vert]

Try 70%. I think this is telling you that you get the maximum flow at 70% and 65 GPM and running the pump higher then that the efficiency drops and you get less flow.

I did try it at 100% with more flow. But you guys are correct. RPM's are much easier to use.
The Pressure Alert when using GPM was the confusion.

 

[ajw22]

I did try it at 100% with more flow. But you guys are correct. RPM's are much easier to use.
The Pressure Alert when using GPM was the confusion.


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What is the difference between these two 100% runs where one gets 49 GPM and the other 92 GPM?

between these two 100% runs

 

[Ed Blown Vert]

What is the difference between these two 100% runs where one gets 49 GPM and the other 92 GPM?

between these two 100% runs

I have no idea. Nothing was changed. One was just after the install. The other the next day.

 

[PoolStored]

What is the difference between these two 100% runs where one gets 49 GPM and the other 92 GPM?

He has algae...see post #17.

See my post #19. I suggested we setup in run% to get rid of alarm, and focus on the algae and come back to the pump/flow problem later...

 

[ajw22]

I have no idea. Nothing was changed. One was just after the install. The other the next day.

Had you cleaned your filter between runs?

 

[Ed Blown Vert]

Sorry didn't see these responses. Just had the pool guy backwash the filter. Now the numbers are what I would expect.