Volvo VNL 780 Operator's Manual page 222

212 INSTRUMENTS AND CONTROLS
To operate the water pump, there is a combined valve and switch in the knob (see arrow in
illustration) on the base. Turn the knob slightly toward you to start the pump; see arrow in
illustration. Turn the knob further to increase water flow. When the knob is turned fully
back to rest position, the pump will stop.
CAUTION
Make sure the pump is turned off before
pushing the drawer in. If the pump
continues to deliver water, overflowing
water can flood the cab floor.
In the bottom of the sink there is a spring-loaded drain plug that is sealed by pressing down
and twisting clockwise. To release for letting water drain off, turn counterclockwise and the
spring will lift the plug and open the drain.
Fresh Water Tank
Water is drawn from the fresh water tank (1) located beside the waste water tank (2) in the
left-hand side luggage compartment. Refill fresh water tank with potable drinking water
only. Tank volume is 9 gallons (34 liters). On top of the tank is a hose (3) that serves as a
filler and a vent tube. In the bottom of the tank is a drain valve (4), with a hose attached, for
draining the tank to the outside.