EVOCA La Radiosa - Page 36

28 05-2019 0073 00
When the coee has been dispensed, the
upper piston lowers in order to mechanical-
ly compress the coee pod which causes
excess water to be drained via the third
route of the dispensing solenoid valve.
At the end of the cycle the gearmotor is
activated in the opposite direction, lifting
the upper piston and rotating the infusion
chamber towards the emptying side, on the
opposite side of the dispensing side; the
lower piston rises.
Once the emptying position is reached,
the gearmotor inverts its rotation direction
again, bringing the infusion chamber back
to the idle position.
The scraper holds the coee pod and lets it
fall, while the lower piston returns to the idle
position.
8
1
3
2
7
5
4
6
Fig. 28
1. Upper piston
2. Espresso nozzle
3. Scraper
4. Connecting rods
5. Cranks
6. Pinion
7. Infusion chamber
8. Lower piston
volumE of tHE iNfusioN cHambEr
The doses of coee that the brewing unit
can handle, depends on the model of the
brewing unit.
The upper piston automatically positions
itself.
Brewing unit doses
Z4000 HRC (∅ 43) 7 - 13.5 g
Z4000 NE (∅ 46) 7.5 - 15 g
Z4000 SE (∅ 38) 6 - 8.5 g