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BUNN Espress™ Model ES•1A™
Central/Electronic unit
This component analyzes and controls all information received from the buttons and volumetric counter,
activating the different relays and thus causing the different electric valves and the electric pump to start
functioning.
The connections of the central unit, as shown on the diagrams, are divided into two parts. First of all, the
connections that are marked with a zero plus a number correspond to the power feed and to the output. The
connections that are marked with just a number correspond to the inputs and to the outputs of the information
coming to the central unit from the volumetric counter, the electronic level or the programming switch. There
is also a single connection with a flat wire for 10 conductors which corresponds to these connection with the
buttons.
FEATURES
F
2
F
1
F
2
Connection
to the
dose switch
013
07
010
06
05
1
2
3
14
5
7
05-06 .....120v. feed
07 ..........Connection refill solenoid
010 ........Output for the group solenoid valve
013 ........Output for the electric pump
Fl ...........Feed fuse, electric pump
F2 ..........Feed fuse electric valves
F3 ..........Feed fuse for the central unit
1-2 .........Output to the programming switch
3 ............Connection to ground
5 ............Feed output (-) volumetric counter (flowmeter)
7 ............Feed output (+) volumetric counter (flowmeter)
14 ..........Connection to the level probe