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1.10
Operating system
The operating system consists of a:
D Keyboard
D Control board
1.10.1 Keyboard
The keyboard is the circuit board with LCD and press buttons.
Settings that can be changed in the program menu are also saved in the Eeprom of this circuit board.
Replacing the keyboard returns the machine to its factory settings.
1.10.2 Control board
The control board is in the machine and contains the electronics that drive the machine.
This board controls the power for the low−voltage components and the temperature.
The board also contains one or more relays and semiconductors that switch the electrical components on
and off.
It also has a microprocessor that controls the boiler routine.
1.11
Hardware protection
The machine has a number of hardware protections. These protections prevent dangerous situations from
occurring such as overheating and/or water in the machine.
1.11.1 Overflow protection
This protection is in the float tank and ensures that excess water caused by a too high water level flows to
the bottom of the machine through the overflow and hose.
1.11.2 Return flow protection
A pipe in the float tank sprays the water from the magnetic valve against the cover of the float tank. The
water then flows into the float tank. This prevents water from flowing back into the system and entering the
water supply if the water pressure in the magnetic valve drops.
1.11.3 High temperature safety switch
The high temperature safety switch is fastened to the outside of the boiler with two Klixons. If, for whatever
reason, the controls do not switch off the boiler, the Klixons will ensure that the voltage on the element is
mechanically switched off. Steam escapes from the boiler during the boil−dry process. This steam enters the
water selector and exits between the cover and the distributor. To prevent droplets from entering the ma-
chine, the water selector is equipped with a drip tray (Fig.24).
Fig. 24 Drip tray for the water selector
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