Operation Manual

7
Extraction Ends
19 At the end of the extraction the user lowers the brew lever fully, rotating the internal cam back to its “at
rest” position. This also opens the contacts of the electrical microswitch on the front of the DD (switch not
shown) and the pump stops.
20 The brew valve is returned to its closed position...
21 ...and both the infusion as well as the exhaust valve (the two valves in the lower group) are opened by the
movement of the cam.
22 The pressure of the water still contained in the group, in the areas below the brew valve, is now released
out of the group. The pressurized water passes the infusion valve and the exhaust valve, and is expelled
into the drip tray. The sound of the released water under pressure can be easily heard the instant the lever is
lowered.
19
20
21
22
The machine is once again idling “at rest,” and the boiler is heating the water. As soon as there is water in
the boiler that is hotter than the temperature of the group, the convection current begins again. With no wait-
ing, the machine is ready to once again make espresso as it was at the beginning of this section.