SH,
If the Pool Circuit is set to run 24/7, then the pump will run at 1200 RPM 24/7...
Leaving the Pool circuit on, if you select the icon for 1500 the pump will speed up to 1500, same for 1800 or clean.
Just keep in mind the the pump will run the fastest speed it is being told to run,, So, if you have 1800 on and then select 1500, the pump will not slow down, unless you turn off the 1800 first..
I would run it 24/7, or whatever amount of time you want, and see how well the skimmers work,,
If the pool is not skimming well, then you can schedule 1500 or 1800 to run once or twice a day for an hour or so.
Looks like you are well on your way to making this set up work for you.
If you have any more questions, just let me know..
Thanks,
Jim R.