modbar AV 1, Manual, Page: 19 / 110

EN
19
4. Machine Operation and Coffee Preparation
1) Starting the espresso machine
a) Filling the boilers with water
Once the installation procedures have
been completed, it is necessary to fill the
boiler tanks with water. Complete the
following procedure to properly fill the
boiler tanks:
• Coffee boiler
The water flows inside the coffee boiler
directly, as soon as the water system and
purifier taps (if present) are opened.
Since the inflow of water will compress
the air in the boiler, it will be necessary to
remove or “bleed” the air from the coffee
boilers. All air must be removed in order
to completely “saturate” the coffee boiler/
group assemblies.
To remove the air from the boiler, or “bleed
the groups”, it will be necessary to activate
the tap lever until water flows from the
group with the module in stand by mode
(main switch in position I, selector in
position I):
Repeat this procedure on all tap(s).
The installation is now complete and the
espresso machine should be heating to
operating temperatures.
2) Waiting for the Espresso Machine to Heat to
Operating Temperature
During this time, it may happen that
the pointer of the coffee boiler pressure
reaches as high as 14-15 bar. This may
happen anytime that the heating element
is in the “on” condition. In this case, it
is necessary to adjust the expansion valve
(see the picture below about the three
coffee boiler expasion valves) in such a
way that the pressure never exceeds 13
bar.
CAUTION
Never remove the filter holder
when water is being delivered.
This operation can be extremely
dangerous since the high
pressure built-up inside the blind
filter would spray out hot and
slightly caustic water, which may
cause severe burns. The Coffee
Boiler contains water at elevated
temperature. Water temperature
over 125°F / 52°C can cause
severe burns instantly or death
from scalding.
IMPORTANT
To improve the flavor of the espresso, the
temperature of the water in the coffee boiler
and therefore of the groups may eventually
be raised or lowered via the digital display
(please consult the Software Programming
Manual for detailed instructions).
WARNING
The machine must not be dipped
in, nor splashed with, water in
order to clean it. For cleaning
operations, please follow the
instructions listed below very
carefully.
WARNING
This machine is designed only for
preparing coffee and hot drinks.