TECHNICIANS' manual16 of 100
2.8.7 LEVER group
The group lever uses the heating unit pressure and water. This
system does not require heat exchangers.
When the lever (1) is lowered, the spring (2) inside the group
is compressed: the piston (3) raises, allowing the water to en-
ter the pre-infusion jacket.
When the lever is released, the piston compresses the water
at 8-10 bar, allowing the espresso coffee to be dispensed.
The check ball valve (4)preventsthewaterfromowingback
into the heating unit (5).
1
45
2
3
PHASE 1
Lowering the
lever
PHASE 2
Pre-infusion for
3-5 seconds
PHASE 3
The lever releases
and coee is dis-
pensed.
2.8.8 LEVER group
A system similar to the one shown for the Dispensing Group is
used for the lever group; see para. XX.
In this case the dispensing is controlled by a spring system.
The opening and closing of the valve for the water ow is
done by pressing a lever on the side of the group that, in turn,
moves a camme within the group, allowing or not allowing
the passage of water.
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