88 GV 640 Service Manual
For internal use only
8.9 Water discharge
When the discharge pump is activated so that water is drained off, the water is pumped to the heat ex-
changer. The water passes through the heat exchanger to the discharge hose so that it leaves the dish-
washer.
A non-return valve has been fitted into the hose connection of the pump cavity. This prevents dirty water
from flowing back into the pump cavity.
1 Discharge pump
2 Internal discharge hose
3 Water discharge inlet
4 Water discharge outlet
5 Air channel
6 Float chamber with floats
7 Discharge hose
8.10 Discharge ventilation
During the pumping out process water is pumped through the discharge channel of the heat exchanger
to the discharge hose.
The water flows through continuously. If the discharge is located lower than the dishwasher, the water
will flow out of the dishwasher as a result of the suction effect even if the discharge pump is no longer
activated.
The float chamber has enough water for the float to float on the water and the ventilation opening to be
closed. The ventilation opening is uncovered by the float as soon as the flow of water in the discharge
slows down. The dishwasher cannot be completely emptied when the discharge pump is deactivated. If
the discharge hose has developed a fault (blockage or kink), pressure will build up.
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