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1.2.7. Main components
1.2.7.1. Boiler
The boiler is made of steel (A), to which is assembled
the heat exchanger which in turn is connected to the
dispensing group. Water for coffee delivery is taken
d
irectly from the heat exchanger.
D
uring 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 elec-
trical heating element immerged in the water (B).
A
- from the exchanger (3) the water is carried to the
g
roup duct (1) for delivery;
-
the pump allows the increase of the pressure of the
water flow up to 8-9 bar for delivery.
To increase of decrease the temperature of the coffee
i
n the cup, you must adjust the temperature of the
water in the boiler (see related paragraph).
At rest
In delivery
3
5
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1
2
4
Manual code 10066574 / Rel. 0.00 / March 2009
Maintenance manual for technical assistance - LB 2800 - LB 2810
B
3
4
1.2.7.2. Delivery group
The delivery group and the heat exchanger are the fun-
damental components in obtaining espresso coffee.
Specifically, the purpose of the group is to dispense
the coffee.
This system includes heating of the dispensing assem-
bly (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);
Note
After lowering the temperature of the water in the
boiler, if the coffee is still too hot, you will need to
insert the choke provided on the upper pipe (5).
8


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