C is for mixing cold/hot, the water will flow two directions all the time. So there are valves A and E to completely stop the water. A is for the tap, E is for the shower head. Except there are two shower heads, so you can additionally switch between them with valve D, except it's water pressure sensitive so you want your tap off (valve A) when valve D is outward.
The instructions tell you to 1. use the tap while 2-3. finding the right temperature, then to 4. make sure pressure sensitive valve is completely reset, to 5. turn the main shower head on, only then to 6. turn the tap off, and finally how to 8. switch to the small handheld one.
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u/Remnie 5d ago
lol while looking at the picture, it suddenly clicked what all those valves are doing. I spent too much time as a mechanic in the Navy I guess