When you change over to city water are there valves that have to be turned? As usual the manual was no help.i have a 2011 Thor windsport 31d. Thanks Tux
Some RVs are plumbed that way. If so you will either have a single multi-position valve handle (anderson valve) in the wet bay with marked functions;
https://static.wixstatic.com/media/...4e1a_bf7691cb98214741b8e8b8a0627872bf~mv2.png
Or you will have multiple open/close valves in the wet bay board with instructions on how to direct flow.
Otherwise, MOST RVs you just have to connect City Water to the marked inlet and turn it on.
The plumbing behind that panel must be a plumber's nightmare. It seems overly complex to me. All that is really needed is a simple three-way valve to control whether the city water connection will fill the tank.
I know on our 2016 Outlaw, class C, when connected to city water, I need to shut the onboard water tank supply line to the system to the off position.
If I don't, the water bleeds by to said tank and it over fills it. It is easier for me to just turn that valve off, than to reach in there, pulling things apart, to find out why the back flow check valve does, or doesn't have a piece of debris lodged in it.
The K-I-S-S principle.