Dispensers; Dispenser Operation - Bosch SHEM63W55N Repair Manual

Design and function

3.2 Dispensers

The dispenser, located in the middle of the inner door, reliably dispenses detergent and
rinse aid.
¡
Detergent covers (lids) are closed by pressing down on them until they "click".
¡
Dispensers allow rinse aid dosages to be controlled by dishwasher control cod-
ings / settings.
Fig. 4: Dispenser detail
1 Rinse aid cover with seal
2 Rinse aid outlet
3 Rinse aid filler opening
4 Detergent cover lock
5 Detergent cover
6 Detergent dispenser
7 Plastic ribs (keeping tabs from sticking)
¡
A vent equalizes internal pressure to dispense rinse aid accurately.
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¡ The actuator is reset when the detergent door is opened so the detergent cover
opens first the next time the coil is activated.
¡ Detergent tablets dissolve more slowly if there's moisture left in the detergent dis-
penser. Two plastic ribs in the detergent cup prevent detergent tablets from "stick-
ing" to the cup.

3.2.1 Dispenser operation

During each wash cycle, the dispenser operates twice, once to dispense detergent and
again to dispense rinse aid.
Fig. 5: Dispenser internal operating parts (front view)
1 Coil
2 Cover release lever
3 Actuator
4 Rinse aid pump
Coil operation:
¡ The coil (1), powered by 165 VDC pulses from the control, moves the detergent
cover actuator (3) to the left. A plastic link turns, rotating the detergent cover re-
lease lever (2), which opens the detergent cover.
¡ A mechanical link between the coil actuator and rinse aid valve prevents rinse aid
from being dispensed when the coil is first actuated. After the detergent cover has
opened, the link moves and locks in place, allowing the rinse aid pump to dispense
rinse aid.
Rinse aid dosage:
¡ Rinse aid is dispensed at 1 ml per dose, with the # of doses equal to the rinse aid
setting (e.g. setting 5 provides five 1 ml doses and setting 1 provides one 1 ml
dose).
¡ Each 165 VDC control pulse dispenses 1 ml of rinse aid.
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