TECHNICAL MANUAL “ Brio Easy serving Espresso“
Manual Brio ESE
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17
3 - AIR BREAK / BOILERS
The
Brio
ESE
vending machine is fitted with
two boilers, each for a specific function.
A classic pressure boiler is used for Instant
selections, normally fitted on the Base Brio as
an all-purpose boiler, but it is kept at an internal
pressure of 10 bar by means of specific setting
of the by-pass valve.
A “flow-through” boiler is used for Espresso
selections; this boiler receives water from the
base pressure boiler preheated at a temperature
of approximately 80° C and then heats it up to
95-100° C.
This solution ensures a long operating life
without premature scaling problems.
It is well known that in flow-through boilers,
where water is heated from ambient
temperature to brewing temperature in a very
short time, very shortly there are problems with
excessive scaling.
The hydraulic circuit is conceived as follows:
When the water in the air-break falls below the
minimum level, a float triggers a microswitch
that sends a signal to the board, which activates
the water inlet solenoid valve
“A”
, then the
water flows through the filter
“B”
and reaches
the air-break
“C”
until it is full to the max level,
controlled by the float and microswitch.
When a coffee selection is made, after
positioning the pod in the brewing chamber, the
pressure boiler two-way solenoid valves is
opened and the vibration pump is started for a
length of time determined by the volumetric
counter, that by computing the number of
rotations of an impeller wheel sets the exact
amount of water necessary for the selection.
The necessary amount of water is drawn from
the air-break and sent to the pressure boiler,
thus pushing out the same amount of hot water
(85° C) which is then delivered to the glow-
through boiler, and heated up to 95° C by
means of forced flow through a coil heated by
the Espresso boiler heating element. This water
is controlled by a pair of three-way solenoid
valves, allowing the flow of water for brewing
and for relieving the excess water in the pod,
thus leaving a perfectly dry pod
Pressure boiler
for instant
drinks
Air –break
“C”
filter for
impurities
“ B”
Elettrovalvola ingresso
acqua
"A”
“Flow-through”
Espresso boiler
Overheating protection
thermo-fuses
NOTE: The pressure boiler is fitted with manual reset
overheating protection.
The flow-through Espresso boiler is fitted with
overheating protection provided by two accurate
thermo-fuses calibrated at 120° C; these fuses must
be replaced after they are triggered.
Before resetting or replacing the above protections,
the problem that caused the trigger must be identified
and corrected.
