Volvo VNL Operator's Manual page 227

222 Cab Interior and Sleeper
To fill the fresh water tank, unscrew the fill
hose from the elbow fitting and remove the
fill cap (5) from the tank. The fill hose
should be connected to a hose with a
gardenhose-type fitting. Before turning the
water on, turn the valve handle (6) on the
fill hose to the side to close the valve (see
lower illustration). When the end of the fill
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hose is inserted in the water reservoir, open
the valve slowly to fill. The valve is fully
open when the handle is parallel with the
hose.
When the tank is filled, reinstall the fill
hose on the elbow fitting. Do not tighten
more than finger tight. Make sure that the
valve handle now is fully open (1) to allow
venting. If the valve is left in any of the
closed positions (2), the pumped out water
may generate an under-pressure in the tank,
interfering with the pump operation.
NOTE! The valve positions are shown as
viewed from inside the cab.
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