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© by NECTA VENDING SOLUTIONS SpA 02-2004 184 02
COFFEE UNIT OPERATION
COFFEE DISPENSING CYCLE
When selecting coffee, the grinder is started and will
continue until the coffee doser chamber is full (see Fig. 20).
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 assembly rotates by 180°, making the brew
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 tea 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.
Fig. 17
Fig .18
CHECKING AND ADJUSTING
THE MACHINE 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 coffee.
The dose weight of ground coffee.
The dispensing temperature.
The water dose.
For instant products
The weight of instant products.
The drink temperature.
The water dose.
Should the standard settings be varied, proceed as indi-
cated in the next sections of this manual.
The weight of instant products, the water dose and tem-
perature are directly controlled by the microprocessor.
To adjust them it is therefore necessary to follow the
programming procedures.
STANDARD SETTINGS
The vending machine is supplied with the following set-
tings:
- coffee temperature (at the spout) 85-89°C approx.;
- instant product temperature (at the spout) 75°C approx.;
The machine standard settings assign the same price,
expressed in number of basic coins, to all selections.
1 - Brewing chamber
2 - External disk
3 - Upper piston
4 - Lower piston
5 - Pre-brewing spring
6 - Swinging lever
1 - Brewing chamber
2 - External disk
3 - Upper piston
4 - Lower piston
5 - Pre-brewing spring
6 - Swinging lever
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