espresso coffee machine - technician instructions
20
- english
R
5.4 CTS SYSTEM (thermosiphon system)
In this system, the delivery group
(1)
is heated by a thermosiphon circuit
(2)
connected to the heat exchanger
(3)
. The same water is used
for the coffee delivery, thus ensuring the same temperature for all coffee servings:
• activation of the solenoid valve and of the pump allow cold water to enter the exchanger
(3)
through the injector
(4)
;
• from the exchanger
(3)
the boiler water is carried to the group
(4)
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.
If necessary, the exchangers can be replaced by removing the flange and
disconnecting the relative pipes of the hydraulic circuit. These operations
should be carried out after the machine has been switched down and has
cooled off: always replace the seals.
5.5 BOOSTED SYSTEM
Heating of the delivery group is provided by direct contact with the boiler.
Water used for delivery of coffee is taken from an exchanger which is
immersed in the water of the boiler and attached to the flange:
• the activation of the solenoid valve and of the pump allows cold
water to enter the exchanger
(1)
.
• from the exchanger
(1)
the boiler water is carried to the group
(2)
for delivery;
• the pump allows the increase of the pressure of the water flow up
to 8-9 bar.
The exchanger can be replaced without having to remove the flange:
loosen the screws, and detach the flange that holds the exchanger.
Perform these operations when the machine is off and is cool. Always
replace the seals.
Water inlet
Coffee delivery
1
2
3
at rest
1
2
3
Water inlet
Coffee delivery
in delivery
3
4
5
