USER MANUAL
Speedster
page 10
Using the machine
Brewing espresso
The 3-way brewing lever on the right hand side of the machine (see
Figure U 1
) operates the group
valve and the pump. The lever can be fixed in 2 slots and thus has three operating positions:
1. OFF. Lever in upper (resting) position. Group is inactive (valve is closed and pump is off).
Water cannot flow from the coffee boiler to the coffee bed.
2. PRE-INFUSION. Lever in middle position. Group valve is open but pump is off. In this position
(hot) water under line pressure can reach the coffee grounds and flow into the pre-infusion
cylinder upon which the grinds will wet and swell. This process is called manual pre-infusion.
You may adjust the timespan of pre-infusion to your liking.
3. PUMP ACTIVE. Lever in lower position. Group valve is open and pump is activated. The water
pressure on the coffee bed will increase to 9 bar (or other pump-setting).
Switching off is easily accomplished by a short down-right tap on the left hand ball on the lever. The
lever will return to its resting position and the remaining pressure in the coffee filter will be discharged.
Figure U 1. Brewing espresso: brew lever, lever positions, brew pressure (coffee boiler pressure)
gauge and progressive pre-infusion cylinder.
When you switch from resting position directly to the lower position, the primary increasing pressure is
still absorbed by a piston and spring within the so-
called “progressive pre-infusion cylinder” up to
approximately 1.5 bar. As soon as the piston reaches its ultimate position, the full pump pressure of 9
bar is slowly applied to the coffee bed. You can easily check the functioning of the progressive pre-
infusion as the guiding rod of the piston will protrude through an opening in the front panel of the
machine just left of the hot water tap (see
Figure U 1
).
pre-infusion
pump active
off
coffee boiler
pressure gauge
brew lever
progressive pre-
infusion cylinder