Astoria SABRINA SAE DISPLAY Use And Maintenance Manual page 18

Sabrina
3.11.9 Safety thermostat
The thermostat prevents any damage occurring to
the electrical heating element if there is no water in the
heating unit. The thermostat bulb (7) is located inside
a sheath (8) in the middle of the heating elements. The
thermostat contacts (9) are connected to the electric
heating element (10). If the electric heating element
is exposed due to a failure to fill the heating unit with
water, the temperature of the heating element increases
dramatically. At this point, the thermostat cuts the power
supply to the heating element in order to prevent dam-
age occurring.
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To reset the thermostat, press the centre button (11). However,
before starting the machine up again, identify what prevented
the water from being fed into the heating unit.
3.11.10 Motor pump
THIS is a component that feeds
the machine, by raising the water
pressure to 8 - 9 bar in order to
dispense coffee and automatically
fill the heating unit.
3.11.11 Electronic control unit
The electronic control unit (2) is the machine's "brain",
since it monitors and controls the appliance's full oper-
ation.
The information concerning the installed software
(date and version) can be seen on the display when the
machine is turned on.
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When the machine turns on, it performs a functional
test and reports information regarding the installed
software:
XX.XX.XXXX: update date
RY: revision number
FUNCTIONAL TEST
EVPLUS XX/XX/XXXX RX
3.11.12 Automatic Water Entry
The Automatic Water Entry system is designed to
check the water level of the heating unit. It consists of:
A probe inserted into the heating unit (1), composed
of a stainless steel rod;
An electronic control unit (2);
A hydraulic circuit with a solenoid valve controlled
by the regulator.
The electronic control unit controls the level of water
in the heating unit. When the level of water in the heating
unit drops, the contact with the probe is interrupted.
The control unit sends an impulse to the inlet solenoid
valve and the motor pump, which are then activated
until the normal level of water in the heating unit has
been restored.
To avoid any flooding caused by machine malfunc-
tions or water leaks in the circuit, the electronic control
unit has a "Timeout" feature which cuts off the automatic
water filling function after a certain time (2 minutes).
When installing machines with three or four groups, the
initial water filling time may exceed the established time-
out limit. Should this occur, simply turn the machine off
and then back on to restore normal operating conditions.
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