Astoria 10003318, Руководство по эксплуатации и обслуживанию

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17
of
54
TECHNICIANS' manual
ENGLISH
Core200
2.8.5 Pressure switch
The pressure switch makes it pos-
sible to control boiler pressure by
activating or bypassing the heating
element in the boiler. Any calibra-
tion of the pressure switch which
may be required can be carried out
with the machine in operation by
means of the screw
(24a)
located on
the body of the component.
2.8.6 Expansion valve + check valve
This is a valve consisting of an
expansion valve and a check valve.
• Expansion valve
(34a)
: the cold
water sent from the pump to the
heat exchangers is heated. This
heating causes an increase in the
volume of water. To limit pressure
increases in the hydraulic circuit,
the valve limits the maximum
internal pressure of the circuit
to 12 Bar.
• Check valve (34b) : its function is to prevent the
water from back-flowing into the exchangers in the
hydraulic circuit.
2.8.7 Electronic control unit
Its purpose is to electronically control
the coffee dose via the water flowing
through the dosing device and to check
that the heating unit is being filled with
water.
2.8.8 Volumetric dosing device
The volumetric dosing de-
vice measures the quantity of
water sent to the group in order
to dispense coffee.
The dosing device gener-
ates electrical impulses which
are sent to the electronic con-
trol unit.
These impulses are read by the control unit and
counted while the dose is being programmed.
The flashing LED light
(25a)
indicates that the electri-
cal impulse has been sent from the dosing device to the
control unit.
2.8.9 Motor pump
This is a compo-
nent that feeds the
machine, by raising
the water pressure to
0,8 - 0,9 MPa (8 - 9 bar)
in order to dispense
coffee and automa-
tically fill the heating
unit.
2.8.10 Overflow device
The cover installed
on the pressure relief
valve makes it possible
to collect any water
and steam which may
leak from the heating
unit due to a malfun-
ction and channel it
to the drain tray, via a
special hose.
2.8.11 Steam nozzle
LThe steam nozzle is connected to the top of the boi-
ler. Depending on the model, steam can be supplied by
turning the adjustment knob on the front of the machine.
2.8.12 Hot water nozzle
The hot water nozzle is connected to a suction pipe
of the boiler. Depending on the model, hot water can be
supplied in two ways:
• Manually: by turning the adjustment knob on the
front of the machine;
• Automatically: by selecting a button connected to a
solenoid valve.
24a
34b
34a
25a