TECHNICIANS' manual16 of 104
2.10.7 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.
2.10.8 CTS group (with a thermosiphonic
circuit)
In this system, the dispensing group (1) is heated by a ther-
mosiphonic circuit (2) connected to the heat exchanger (3).
The same water is used when dispensing coffee, thus ensur-
ing that all coffees are the same temperature:
• The solenoid valve and the pump are activated in order
to send cold water into the exchanger (3) through the in-
jector (4).
• The heating unit water is carried from the exchanger (3)
to the group (4) for dispensing.
• Thepump allows the waterow pressure to increase to
8-9 bar for dispensing.
The injector (4)andtheowreducer(5) are important com-
ponents for the dispensing group’s operation. To increase the
coffeeextractiontemperature,removetheowreducer(5) or
replace it with one that has a bigger diameter. To decrease
the temperature, replace it with one that has a smaller di-
ameter. If necessary, the exchangers can be replaced by re-
moving the ange and disconnecting the relative hydraulic
circuit pipes. These operations should be carried out when the
machine has been switched off and has cooled down: always
replace the seals.
3
Water inlet
Coee
dispensing
5
34
DISPENSING IN PROGRESS
2
3
1
IDLE
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