58300000111195_ARA_en_f.doc – 02.06.09 Seite 37 von 102
4.8 Ceramic valve (2-way valve)
By rotating the function selector on the front of the control panel, the
drawing of hot water (1), coffee (2) or steam (3) can be selected on
the ceramic valve.
Two ceramic wheels which rotate against each other convey the hot
water or the steam to the hose connections for the drainage valve or
the steam pipe.
(A) Heating inlet
(C) To the drainage valve (brewing unit)
(D) To the steam pipe (drawing hot water and steam)
4.8.1 Switch matrix
The microswitches S1 and S2 control the heater and pump via the
logic board. The microswitches are actuated by rotating the cam.
4.8.1.1 Switch positions:
Steam:
S1 open S2 closed
Coffee:
S1 closed S2 open
Hot water:
S1 closed S2 closed
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