Bunn ES1A service manual BUNN Espress, Features, Model ES 1A, Central/Electronic unit

BUNN Espress™

FEATURES

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.

5

7

F 1

F 2

013

07

010

06

05

F 2

1

2

3

14

Connection

to the

dose switch

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

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