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espresso coffee machine - technician instructions
English
8. DELIVERY GROUP
The delivery group and the heat exchanger are the fundamental components in obtaining espresso coffee. Specifically, the
purpose of the group is to dispense the coffee.
This system includes heating of the dispensing assembly (1) through thermosiphon circulation (2) connected to the heat exchanger
(3). The same water is used for dispensing coffee:
• activation of the solenoid valve and the pump allow cold water to enter the exchanger (3) through the injector (4)
• from the exchanger(3) the water is carried to the group duct(1) for delivery
• the pump allows the increase of the pressure of the water flow up to 8-9 bar for delivery.
The injector (4) and the flow reducer (5) are important components for the operation of the delivery group.
To increase the coffee extraction temperature, remove the flow reducer (5) or replace it with one of a greater diameter. To decrease
the temperature, replace it with one of a smaller diameter.
Water
inlet
Coffee
delivery
in delivery
4
3
5
at rest
1
2
3
7. BOILER
The boiler is made of steel (1), to which is assembled the heat exchanger
(3) which in turn is connected to the dispensing group. Water for coffee delivery
is taken directly from the heat exchanger.
During delivery, cold water is sent to the inside of the exchanger by means of
the pump. Inside the heat exchanger, cold water and the pre-existing hot water
are mixed, thus obtaining optimal water temperature for coffee infusion.
The water is heated in the boiler by means of an electrical heating element
immerged in the water(2).
2
3
1
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