58300000111195_ARA_en_f.doc – 02.06.09
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4.6.2.3 Brewing
The brewing process starts. The pressure pump conveys the water
into the brewing unit. The brewing head
(D)
is moved up by the water
pressure, thereby increasing the volume in the brewing chamber. The
hot water is mixed with the ground coffee longer and more intensively,
thereby improving extraction of the flavours and formation of the
crema. If the pressure inside the brewing chamber increases above
4.5 bar, the crema valve
(E)
opens and the coffee can flow to the
coffee outlet
(F)
.
4.6.2.4 Emptying
When the programmed amount of water is reached, the pump stops.
The pressure in the brewing chamber drops and the coffee dregs are
compressed into a solid cake. The drainage valve opens, pressure
and residual water are released into the drip tray. When the brewing
unit descends, the brewing chamber moves back to the initial position
(G)
and the coffee dregs are emptied into the dregs drawer.
