Yesterday I got lucky, the 24V transformers were found on the clearance table. I hooked it all up, and only need to connect it to the XP3 outflow. I'll show some pics of the various components later.
This is how it's supposed to work:
I am collecting "used tank water" for watering the yard. If I would just drain it things might be easier, but here is what I want to do: during the week, I use up the water in my "reservoir". There is a mechanical float valve, and a ball valve. On water change day, I open the ball valve, and the tank water drains into the reservoir until the float valve shuts it off.
As soon as the water level drops by about an inch, the refill starts to kick in, powered by a sprinkler valve which is connected to the float switch in the tank. Once its done draining and refilling the float switch turns off the valve and things are quiet again.
So it is all inline plumbed except for the float switch, which after all I positioned inside the tank instead of in another container with overflow. Keeping it simpler. There are only 2 wires going over the tank rim, so no big deal.
