When hooking up to water, Jacyo Class C motorhomes have a couple of settings. 

Check out this video on how the system works.  

City Water Connection, connection point on the right, is to connect your water hose to the outside spigot.  Use the dial (use below) to adjust how you are using the water.   The left water connector is Sewer Flush this is used ONLY to flush the black tank and must follow proper procedure, so you don’t shoot water into the RV!!

Normal is position 3 and 5.  Normal is for when you want to use water onboard and NOT hooked up to an outside spigot.  Water will be coming from your freshwater tank and will require the Water Pump to be ON to pull water from the freshwater tank. 

City Tank Fill, position 1 & 6, is for filling the freshwater tank.  You must be connected an outside spigot.  You will know the freshwater tank is full because water will come out of the overflow value on the bottom of the camper.   This is for filling ONLY, not for using water on board.

City Water Fixtures, position 2 & 6, is for using water onboard while hooked up to an outside spigot.  The water pump must be OFF.  In this position, you will NOT fill the freshwater tank onboard, as it is not needed.