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Hi. I hope I can explain this so it makes sense...The center position is easy. It's off. Use it for maintenance if necessary. The other two positions will depend on how your system is plumbed. Typically, you'll have pool/spa suction/return. IOW you'll have one valve pointing at pool /suction and the other at pool /return. You want them to be in sync. If they aren't in sync, use the switch on the wayward valve to put it on sync with the other. Same logic applies to using the spa.Note that this is how it works on my system, which is about as simple as it can be. Did that help?
Perfect! I got it. Thanks. As I suspected, I was making it more difficult than need be. A picture truly is worth a thousand words!