Bosch ZSB 30-2 Installation And Servicing Instructions page 13

1 Spark transformer
2 CH temperature control
3 Wiring centre
4 Safety solenoid
5 Safety solenoid
6 Gas valve
7 Fan
8 Flame sense eletrode
9 Spark electrodes
10 Flow NTC
11 Heat exchanger overheat stat.
12 Flue overheat stat.
13 Earth
14 Mains supply
15 Pump
16 Pump control
17 Diverter valve (optional)
18 Pump supply
19 DHW temperature control
20 Fluse slow T 0.5 A
21 Fluse slow T 1.6 A
21 Code plug
Product details | 13
6 720 644 143 (2010/09)