Necta Korinto UL, Installation, Use And Maintenance Manual

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© by N&W GLOBAL VENDING SpA 07 06 274 -00
VARIABLE CHAMBER
COFFEE UNIT
COFFEE DISPENSING CYCLE
When confirming the switch on cycle of the machine, by
pressing a selection button, the coffee unit is rotated
completely twice before the normal cycle, to ensure that
the device is in the correct start position.
When making a coffee based selection, the grinder will run
for the time necessary to fill the brewing chamber with the
coffee dose set via software.
When the ground coffee dose is reached, the ratiomotor
engaged with the handle (11) located outside the assem-
bly rotates by 180°, making the brew chamber swing (8)
(see Fig. 16).
The pump is started and, by effect of the water pressure,
the upper piston (5) is lowered enough to close the brewing
chamber and lightly compress the ground coffee.
The dispensing valve opens, allowing the pump to push
the boiler water onto the coffee for the brewing cycle.
At the end of the dispensing cycle, the purge valve opens
and the coffee dose is lightly pressed, permitting the
discharge of residual water through the third way of the
dispensing solenoid valve. The purge solenoid valve opens,
depressurising the upper piston.
By completing the rotation of the ratiomotor (see Fig. 17)
the pistons and the coffee dose are lifted by means of the
swinging lever (5).
At the same time, when the brewing chamber returns to its
vertical position, the scraper on the coffee hopper stops
the used coffee dose and drops it.
The lower piston now returns to the top dead centre.
Fig. 16
1 - Boiler connecting hose
2 - Central quick coupler
3 - Upper piston pressure tube
4 - Side quick coupler
5 - Upper piston
6 - Upper piston gasket
7 - Coffee funnel
8 - Brewing chamber
9 - Lower filter
10 - Swinging lever
11 - Handle
Fig. 17
1 - Upper piston
2 - Lower filter
3 - Brewing chamber
4 - Filter return spring
5 - Swinging lever
6 - Handle