I was wanting to replace my single speed Pentair 1hp pump with a VS or 2 speed pump.
2 - 2" suction lines (1 main / 1 skimmer)
6 - 1.5" return lines (3 eyeball / 3 laminars) - manually adjust the valves when the laminars are on.
I attached some guages to measure the vacuum and psi.
Vacuum on suction side was 5 with both suction lines open, 10 with only 1 open.
PSI on return side is 18, (filter guage shows 15)
My pump is quite a distance from the pool, so I didn't know if a VS pump running at lower speed would still be able to circulate the water ok.
I figured the TDH to be 47.23 (Vacuum 5 X 1.13 =5.65) + (Pressure 18 x 2.31 = 41.58)
I looked at the chart on a Hayward TriStar VS pump (SP3200VSP), but not sure how to read it with the info that I have from the current pump.