NECTA SPA TECHNICAL MANUAL “COLIBRÌ”
Service Manual: Colibrì
Edition 02-2002
14 /25
5 - ESPRESSO COFFEE BREWER UNIT
The well known and reliable
Z 2000
M unit is used, but with some changes to make it more suitable and with
simpler operation, to take into account the Colibrì characteristics.
The main differences between the coffee brewer and the standard Z 2000 unit are as follows:
1) No unit detection microswitch. This solution was adopted to make the wiring simpler and therefore
eliminate the remote possibility of malfunctions due to false contacts.
2) Using only one dead centre positioning microswitch. More specifically the upper dead centre position
microswitch was eliminated (piston fully open) and such position is determined by the SW that
calculates the time taken by the ratiomotor to reach the upper dead centre after triggering the lower
dead centre microswitch (brewing position). Tests showed that the time to travel the distance is
consistent and does not change much because of the type of motor used.
3) In the event of failure to the microswitch installed, a time-out device disables the motor.
4) As an optional feature a kit for heating the first selection coffee is available (see kit description).
The unit is factory set to accommodate a patented first coffee KIT, based on the use of a very low power
consumption heater of the NTC type and a built-in thermostat (see separate description).
After a long pause the first espresso coffee could be of a slightly lower temperature than the optimum one.
The Kit (ref. 7) ensures optimum temperature in the brewing chamber, without altering the taste as it happens
in currently marketed systems (burnt taste).
Espresso coffee brewer detail
Positioned at the upper dead centre
Ready for loading ground coffee
The unit is factory fitted for the installation of
a first coffee heater kit, see drawing.
