Astoria SABRINA SAE DISPLAY Use And Maintenance Manual page 17

3.11.7 CTS group (with a thermosiphonic circuit)
In this system, the dispensing group (1) is heated
by a thermosiphonic circuit (2) connected to the heat
exchanger (3). The same water is used when dispensing
coffee which ensures that all coffees are the same tem-
perature:
The activation of the solenoid valve and the pump
allows cold water to enter the exchanger (3) through
the injector (4);
The heating unit water is carried from the exchanger
(3) to the group (4) for dispensing;
The pump allows the water flow pressure to increase
to 8-9 bar for dispensing.
The injector (4) and the flow reducer (5) are important
components for the dispensing group's operation. To in-
crease the coffee extraction temperature, remove the flow
reducer (5) or replace it with one that has a bigger diame-
ter. To decrease the temperature, replace it with one that
has a smaller diameter. If necessary, the exchangers can be
replaced by removing the flange and disconnecting the
relative hydraulic circuit pipes. These operations should
be carried out when the machine has been switched off
and has cooled down: always replace the seals.
1
5
Coffee
dispensing
Water inlet
TECHNICIANS manual
3
2 IDLE
3
DISPENSING IN PROGRESS
4 3
3.11.8 Group with an EXTRACTABLE exchanger
The dispensing group heating is provided by direct
contact with the heating unit. The water used to dispense
coffee is taken from a so-called "extractable" exchanger
which is immersed in the heating unit's water:
When the solenoid valve and pump activate, this
allows cold water to enter into the exchanger (1).
The heating unit water is carried from the exchanger
(1) to the group (2) for dispensing;
The pump allows the water flow pressure to increase
to 8-9 bar.
The version of the extractable exchanger for the
Italian market does not include the suction hose (3) and
seal (4).
If necessary, the exchanger can be replaced without
having to remove the flange: loosen the screws, remove
the dispensing group from the heating unit and remove
the exchanger. These operations should be carried out
when the machine has been switched off and has cooled
down: always replace the seals.
1
Water
inlet
Sabrina
4
Coffee
dispensing
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