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7
CONTROL OF COFFEE DOSAGE
Each group head is fitted with a flow rate sensor, or a volumetric dosage device.
It measures the volume of water being fed through the group, to ensure that the final volume
of coffee in the cup corresponds to the value programmed by the user.
At the end, the final volume of coffee in the cup, in cubic centimetres (millilitres), corresponds
to its weight in grams, since the specific weight of the extract being almost the same of the
water.
To achieve this result, the device control system takes account of the quantity of water neces-
sary to wet the coffee puck, quantity that does not reach the cup during the extraction, and
adds it to the programmed quantity.
The quantity of water necessary to wet the coffee puck is presetted at the factory, with the
quantity of ground coffee as 6/8 grams for singles and 12/16 grams for doubles.
The dispensing capacity corresponding to these parameters is around 1 cc/second, ie
obtained by grinding granulometry required for the Italian espresso.
When using different quantities of coffee or different grinding granulometry, kindly contact
Technical Support.
This system is not requiring complex and unreliable technologies such as Gravimetric
technology, while still allowing a very high precision in determining the so-called Brew Ratio
but with very low production times: for example, is not requiring the filterholder weighing
before and after loading the coffee.
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MEASURING THE BREWING PRESSURE
The appliance is fitted with a pressure sensor that measures the pressure delivered by the
pump during brewing.
Through the reading of the display, this enables technician to set manually the pump
pressure during coffee dispensing.
9
MEASURING THE WATER SUPPLY PRESSURE
The same sensor referred to in the previous paragraph measures, when the water pump is
stopped, the water supply pressure with which the appliance is fed.
Value displayed on the same display.
10
PROTECTING THE HEATING ELEMENTS
The three boiler heating elements, 1170 W each for the 2 groups models and 1840 W each for
the 3 groups, are protected from overheating.
Such protection is obtained by means of a thermostat with manual reloading which controls
the cutting off of power to the heating elements.
In each of following cases:
- Excessive duration of heating,
- Exceeding of maximum allowable temperature value,
the heating elements are disabled and a major fault is displayed.
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WARMING THE CUPS
These models are equipped with cup heater trays with the capacity to contain a large
number of cups on various levels and to keep them warm in order to guarantee an excellent
cup of coffee.
The heat is generated by a natural flow of hot air from the inside of the machine.
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12
USER ALERTS
The machine can display the user the following alerts:
" WAIT: MACHINE IS HEATING UP "
" MACHINE READY "
" MACHINE IN SLEEP MODE - NIGHT CYCLE "
the following minor alarms:
" BREWING NOT SATISFACTORY- CHECK COFFEE TAMPING OR DOSING OR GRINDING "
" BUFFER BATTERY ABOUT TO GO FLAT- REPLACE PROMPTLY "
the following major alarms:
" BOILER WATER LEVEL CONTROL SYSTEM FAULT - MACHINE OFF - REPAIR "
" BREWING WATER TEMPERATURE CONTROL SYSTEM FAULT - MACHINE OFF - REPAIR "
13
SOUND EMISSION
The weighted sound emission level A of these models is 80dB uncertainty 1dB.
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