Hi Northrider, thank you so much for the detail explanation. What you say is really making sense. Based on your comments above, I am more understanding about hoe the valve works and looked up the Jandy 3 way valve online too. So, at least now I know when the handle point toward certain directions, the valve is totally open, partially open or closed. So, thank you! I will look into adding the actuator to the return valve. I did had Pentair warranty person out last week, he said that there is a problem with the flow, maybe a dirty filter because the pressure gauge on the filter is showing too high of psi, and also the salt cell has a red light indicating a flow issue. However, my pool maintenance guy said he just cleaned the filter..... So he said he will clean again to see if the flow issue will get solved....
Another question I have is that the two skimmers barely sacking up leaves. They used to, but not anymore. The water level is good. The pump is at 2450 RPM as recommended by the Pentair guy. I increase the speed to 2850 for 4 hours a few days ago to see if the skimmers do better but not difference there.... So, can I close the main drain a bit to get more suction to the skimmers? Or if the problem with the flow get resolved by cleaning the filter, the skimmers will start acting normal?
Thanks again for all your help!