Service Manual FB 7100 Water System
5A - 18 January, 2005
A.3.2 Function: Inlet valve and water inlet into the boiler
Description • The inlet valve ‘I’ is opened until the water level sensor ‘A’ recognizes
that the boiler ‘B’ is filled.
• When the correct filling level in the boiler is reached, the water inlet
valve is closed.
If the correct filling level has not been reached within threeminutes after
the inlet valve has been opened, the error message “Water level low” is
given.
If the boiler ‘B’ is filled for the first time, an error message is given if the
correct water level has not been reached within three minutes.
A.3.3 Function: heating and temperature regulation
Description • The heating element ‘H’ is switched on as soon as the water level
reaches the water level sensor ‘A’.
• The temperature sensor ‘T’ measures the temperature in the boiler and
controls the switching on/off of the heating element according to the
value set in technician mode, see chap. 4, page 64.
• The dry running protection ‘D’ triggers and switches off the heating
element, if the temperature rises above 100°C. To enable the heating
element again, you must reset the dry boiling protection manually and
restart the machine, see this section, page 5A-11.
• The overboil sensor ‘E’ is located in the overflow hose. If the sensor
detects steam or water in the overflow hose, it will switch off the heat-
ing element ‘H’. To enable the heating element again, you must reset
the overboil thermostat manually and restart the machine, see
this sec-
tion, page 5A-8.
• Water from the overflow hose is led into recipient ‘C’ at the end of the
overflow hose, e.g. a cup.
• If water is continuously running through the overboil hose, the water is
led back to the inlet valve. When the water pressure in the mechanical
pressure security valve of the inlet valve reaches a certain level, the
pressure security valve triggers and closes the inlet valve. The hoses to
the inlet valve has to be disconnected and reconnected to release the
pressure in the inlet valve and the pressure security valve, see this sec-
tion, page 5A-13
A.3.4 Function: water outlet system and outlet valves
Description When a hot drink is to be dispensed, the machine will open valve ‘VR’ and
start pump ‘P’ simultaneously. The valve ‘Vx’ remains closed.
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