Correction to the fifth image per Tom, with just "A" handle end rotated up the upper skimmer stopped working and the spa overflow slowed. (so more draining than otherwise)
The ends of the handles on all three valves face the inlet port so it has full 180 degree range of motion.
Tom, the second drawing with all the back of the handle ends facing to the right (towards the inlet) result in the lower skimmer stopping, upper skimmer more action and spa draining.
The ends of the handles on all three valves face the inlet port so it has full 180 degree range of motion.
Tom, the second drawing with all the back of the handle ends facing to the right (towards the inlet) result in the lower skimmer stopping, upper skimmer more action and spa draining.