Now that we have the Excel, I got to poking around. There was a clear hose attached at a tee, to the suction side of the pump. It's the antifreeze suction line. The way they did it from the factory, it kept kinking and wouldn't let it suck. I modified it and added an elbow... Eliminating the kink.
Anyway, While I was under there, I got to looking at the factory plumbing and how they plumbed the fresh tank fill. Simply put, they put a tee in the suction line and hooked it to the cold water pipe. There is a valve before the tee. They also did not use the three-way valve, like Sunline did. There is a valve to cut off the fresh tank, a valve for the city water feed and a valve for the antifreeze suction. Here's a pic, to help you visualize it:
In the picture, the white PEX is what I added to the antifreeze line. I didn't notice until I saw the pic, but I may have to replace that crimp ring.
The line beneath the wire nut is the line coming from the fresh tank. The other one is from the city water. with both of those valves open, the fresh tank will fill from the incoming city water. The fresh tank line gets closed for winterizing.