28
6.3 Calibration of water pressure in the boiler
a. After having fi lled the boiler to the proper level, turn the main switch to position 2 (the heating elements will
start to heat the water).
b. Open the lever-controlled steam valve 5 to vent the air during the heating phase. Close the valve as soon as
the steam phase is reached. The steam pressure in the boiler can be read on the upper scale of the pressure
gauge 18 from 0 to 3 bar. The pressure rises to the calibration value of the pressure switch 27 in the range
from 0.9 to 1.1 bar. To vary the steam pressure, turn the screw 28 on the pressure switch 27. The pressure
is decreased by turning the screw clockwise and it is increased by turning the screw coun terclockwise. The
screw is adjusted by means of a screwdriver inserted into the hole on the lid of the pres sure switch. The
pressure switch can be reached from the upper tray and grill.
6.4 Heating the water in the boiler
a. Rotate the main switch to position 2
b. Hold down a steam delivery lever 5 to allow air to escape from the system as the machine heats up. Release
the lever as soon as steam escapes from the delivery pipe. Boiler pressure is indicated on the 0- to-3-bar scale
on the pressure gauge 16 (suggested value: 0.9-1.2 bar).
6.5 Cup heater
The cup heater is used to increase heating of the upper cup support surface. Use the tap 4 to activate or de-
activate the cup heater.
6.6 Steam delivery
This function is used to deliver steam from the boiler to heat liquids, or to foam milk for cappuccinos. Lower or
raise the lever 5 to obtain the maximum fl ow of steam. Move the lever sideways to the left of right to obtain a
reduced steam fl ow.
6.7 Hot water delivery
The lever-operated tap 11 is used to deliver hot water from the boiler for making tea, camomile herb tea, etc.
This lever operates in the same way as the steam delivery lever.
6.8 Preparation of ground coffee
Make sure that the fi lter with the desired capacity has been installed in the fi lter holder. After the coffee has
been loaded and pressed into the fi lter, the coffee level in the fi lter must just touch the spray head on the brew-
ing unit. To check for correct coffee level, install the full fi lter holder onto the brewing unit and then remove the
holder. Now, look at the surface of the coffee: if the level is correct, the coffee will contain the imprint of the
central mounting screw on the spray head of the brewing unit.
6.9 Brewing coffee
Semiautomatic models: 80–Preziosa 12
Once the fi lter holder has been installed onto the machine, simply press the switch 18 to actuate the pump and
solenoid valve. When the coffee in the cup has reached the desired level, move the switch.
Automatic models: 80–Preziosa 16M
Once the fi lter holder has been installed onto the machine, press one of the fi ve brewing buttons. The fi rst two
buttons 6 and 7 are used to select the two pre-programmed single portions of coffee. The second two buttons
8 and 9 are used to select the two pre-programmed double portions of coffee. The fi fth button 10 immediately
shuts down brewing if pressed during a coffee brewing cycle. Button 10 can also be used to brew the desired
quantity of coffee manually: press this button to start brewing, and presse the button a sec ond time to stop
brewing when the desired quantity of coffee has been obtained.
6.10 Draining the boiler
If the boiler must be emptied, shut off the power to the machine by moving the main switch 1 to the “zero” posi-
tion. On gas-fi red machines, extinguish the fl ame by closing the gas feed valve. Open the drain tap 21 until the
boiler has been completely drained.
Important: be sure to close the tap before refi lling the boiler.
