Necta Astro, Installation, Operating And Maintenance Manual

Page: 17 / 84

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© by NECTA VENDING SOLUTIONS SpA 0210 206-00
COFFEE UNIT OPERATION
COFFEE DISPENSING CYCLE
When selecting coffee, the grinder is started and will
continue until the coffee doser chamber is full (see Figure
17).
When the doser unit is full, the ground coffee dose is
released into the coffee unit.
The coffee falls into the vertical brewing chamber (1) (see
Fig. 18).
The ratiomotor handle engaged with the disk (2) located
outside of the unit rotates by 180°, making the brewing
chamber swing and lowering the upper piston (3) (see Fig.
18).
Due to the water pressure, the pre-brewing spring (5) sinks
and the lower piston (4) goes down 4 mm, thus forming a
water cushion which allows an even use of the coffee dose.
At the end of the dispensing cycle and during a pause of 3
seconds, the pre-brewing spring (5) will discharge the water
through the third way of the dispensing solenoid valve,
lightly pressing the used coffee dose.
By completing its rotation, the ratiomotor makes the swing-
ing lever (6) lift the pistons and the coffee dose.
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 bottom dead centre.
1 - Brewing chamber
2 - External disk
3 - Upper piston
4 - Lower piston
5 - Pre-brewing spring
6 - Swinging lever
Fig. 17
1 - Brewing chamber
2 - External disk
3 - Upper piston
4 - Lower piston
5 - Pre-brewing spring
6 - Swinging lever
Fig .18
CHECKING AND ADJUSTING THE MA-
CHINE SETTINGS
To get the best results from the product used, the following
should be checked:
For coffee
That the used coffee dose is lightly compressed and damp.
The grade of grinding of ground coffee.
The dose weight of ground coffee.
The dispensing temperature.
The water dose.
For instant products
The dose weight of the instant products.
The drink temperature.
The water dose.
Should the standard settings need to be changed, proceed
as indicated in the next sections of this manual.
The weight of instant products, the water dose and tempera-
ture are directly controlled by the microprocessor.
To adjust them it is therefore necessary to follow the
programming procedures.