Be careful with the pre-named circuits. They are sometimes designed to work in ways that are unusual. Use a CUSTOM NAME for a GENERIC circuit to control an AUX relay. For example, I thought using the pre-named circuit "AERATOR" would be a good idea for something I was doing but, as it turns out with Pentair (il)logic, the canned AERATOR feature activates the SPA return valve so that water is pulled from the pool and sent to the SPA jets ... ok, that makes some sense and some nice bubbles. BUT, when in AERATOR Mode, the SWG is also activated AND you can run the heater .... so AERATOR will push all the water through the SPA jets, heat it and chlorinate it ?!?!!! I discovered this is the most unpleasant of ways - I was sitting in the spa with the aerator feature running just relaxing and it started to become hard to breath occasionally ... my IC40 was set to 60% and when it would turn on, some of chlorine gas it was generating was getting mixed up in the air bubbles and coming out of solution all around me. My wife happened to walk over and she said, "What the heck is that chlorine smell??" I hadn't noticed it much because I was sitting in it and it was building up slowly around me. Because the AERATOR feature runs the SWG in POOL Mode (full output), the amount of chlorine produced can get very high or at least high enough to cause breathing difficulty.
So I honestly am not sure why Pentair has that feature but I assume it's trying to do something useful with lots of chlorine and outgassing ... suffice it to say, I don't use that feature anymore and I created a custom circuit name with the feature set as GENERIC for what I needed...