My 2017 Cardinal didn't come with all of the required documentation(manuals), and since it is time to think about winterizing in the northern climates, I thought I would post this info as it was helpful for me.
If you have a water panel that looks like this:
Then the instruction manual can be found from the panel manufacturer here: http://www.bandbmolders.com/files/User_Instructions.pdf
In it, you will find the step by step process for properly winterizing the basic pumbing of your trailer, including this panel. The panel performs the proper water heater bypass as well. Surprisingly, the instructions require blowing the panel out with the valves in a certain postion, to clear the passages behind the system too. Then, followed by RV antifreeze through all the lines to all fixtures. Follow your additional instructions for winterizing additional items like clothes washer, refrigerator water/ice maker as well.
2017 Cardinal 3850RL Mocha Pearl full body paint
2016 F350 Lariat 4x4 FX4 SRW CC SB 6.7 Magnetic Metallic