Wega Mininova, Инструкция по эксплуатации

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espresso coffee machine - technician instructions
5.5 TURNING THE MACHINE ON
After supplying the machine with water, turn the machine on using the main switch
(1) .
Before using the machine, wait for a short time (about 20 min.) until the gauge (2)
indicates the correct working pressure (1-1,2 bar).
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• during the machine’s warm-up phase (roughly 20 minutes), the
negative pressure valve will release steam for a few seconds
until the valve itself closes.
• before using the machine, run deliveries dry with the fi lter holder
attached for a few seconds to release any air which may be in
the circuit, so that the delivery groups are completely heated.
• before using the machine, dispense a few servings of coffee to
check the operating pressure of the machine.
6. AUTOMATIC WATER ENTRY (A.E.A.)
The Automatic Water Entry system is for checking the boiler level. It is com-
posed of :
• probe inserted in the boiler
(1) , composed of a stainless steel rod;
• electronic control unit (2) ;
• this is a component that serves the purpose of feeding the machine,
raising the water pressure to 8-9 bar for the delivery of the coffee and for
automatic filling of the boiler.
The electronic control unit controls the level of water in the boiler. When the
level drops, the contact with the probe is broken. The control unit sends an
impulse to the inlet solenoid valve and to the motor pump, which are activated
to restore the normal level of water in the boiler.
To avoid possible flooding due to machine malfunctions or leaks in the
hydraulic circuit, the electronic control unit includes a timing device that cuts
off automatic filling after a maximum operating time of 120 seconds.
In the model with internal tank, lack of water is
signalled either by the blinking of the STOP/PROG
LED in the EVD model or when the signal light turns
on in the EMA-EPU models.
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