My SWG diagnostics don't look right.

[JamesW]

1. Any risk in running the lower rpm and having 100+ degree water running through the system other than what we're discussing with the SWG?

I would keep the flow at at least 35 gpm.

2. What are the risks moving to T9?

In my opinion, it's fine, but Hayward might not like it and they might blame it for some future problems and deny the warranty.

I am not recommending that you do this.

I am only saying that it is something that could be done.

It's your choice and your own risk based on your own research.

3. Easy way to figure out power usage?

The pump shows the power in watts.

 

[JamesW]

These are the pump performance curve and the estimated system curve.

You can superimpose the system curve onto the pump performance curve so that you can see what the flow will be for any speed.

Change the speed from percentage to rpm in the settings.

y = 0.012x^2, x from 0 to 90 - Wolfram|Alpha

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

www.wolframalpha.com

y = 0.012x^2, x from 0 to 90

 

[JamesW]

Curve A Head (ft) = 0.0167 * GPM^2 - Typical 1.5" Plumbing.

Curve B Head (ft) = 0.05 * GPM^2 - Really high head loss Plumbing.

Curve C Head (ft) = 0.0082 * GPM^2 - Typical 2" Plumbing.

 

[JamesW]

 

[JamesW]

60% is 2,070 RPM.

y = 0.0095x^2, x from 0 to 90

Y = Head in feet.
X = Flow in GPM




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Y = Head Loss in feet.

X = Pump RPM.

y = (30x^2)/(2070^2), x from 0 to 3500 - Wolfram|Alpha

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

www.wolframalpha.com

_____________________________________________________________________________________________________________

Y = GPM.

X = Speed in RPM.

y = X/37, y from 0 to 100 - Wolfram|Alpha

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

www.wolframalpha.com

_____________________________________________________________________________________________________________

 

[JamesW]

1500 RPM should give about 40 GPM, which would be a 12.5 degree temperature rise.

Estimated power usage = 335 watts.

 

[bobby2175]

This is a lot to take in. Let me review everything in detail...I'm sure I'm going to have more questions. Thanks for all of the information. This has been very informative.

 

[bobby2175]

1500 RPM should give about 40 GPM, which would be a 12.5 degree temperature rise.

Estimated power usage = 335 watts.

View attachment 527206

Ok, finally got a chance to start playing with this and when I try to take the % speed of the pump to less than 50%, the system comes back and says that I cannot swt the speed beow the minimum allowed by the heater. So, it looks like 50% is the lowest I can go.