You need to login to the web interface of your Jandy system. once in, click System Setup, then Freeze Protection, then from there you can put an X beside each device you want on freeze protection. You can also change the temp from this screen. I have an X beside "Filter Pump" and "Spa" in my freeze protection screen. The systems switches back and forth between the spa and pool set this way. This also causes the original issue this thread is talking about. My spa water level drops due to this cycling between pool and spa. I think its because the return JVA is switching faster than the suction JVA causing the returns to switch back to the pool for a few seconds while the suction is still on the spa therefore dropping the spa water level. Every morning when we wake up after a night of freezing temps, the water level has dropped over a foot in the spa.
For the VSP speeds, click on System Setup, then VSP Setup, Then Speed Setup below the table of pumps, then select the pump you need to change then click Next, then make your changes and click save.
hope this helps.
If anyone reading this has any ideas on how to keep the Spa from draining during freeze protection, I would appreciate it!