Needed advice about setting drain handle angles to vacuum

[FMcBledsoe]

My 30-year-old pool is 15,000 gallons, 12 x 36 ,in- ground liner pool with a sand filter and uses a Zodiac machine to manufacture chlorine from salt.
For the first time in a long time, due to a new company that basically just opened the pool and left it in my care, I am needing to vacuum for the first time in a long time (Usually, my dolphin Nautilis can handle it, but this is too much.) I do not remember how to set the drain handles to get the suction correctly. Could someone advise me on this?

 

[Jimrahbe]

Mc,

Do you have a vacuum port on the side wall of your pool, or do you vacuum through your skimmer??

Looking at your pic you have two inputs to your pump..

They could be Skimmer and Main Drain... or, They could be Skimmer and Vacuum line.

If the blue handle is pointed up and down or parallel to the pipe, the valve is fully open.

If the blue handle is pointed left or right or perpendicular to the pipe the valve is fully off.

Thanks,

Jim R.