Bosch ZSB 30-2 Installation And Servicing Instructions page 15

1 Spark transformer
2 CH temperature control
3 230 V room stat/programmer
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 DHW sensor
16 Pump
17 Pump control
18 Diverter valve
19 Flow turbine
20 Pump supply
21 DHW temperature control
22 External frost stat (optional)
23 Fluse slow T 0.5 A
24 Fluse slow T 1.6 A
25 Code plug
Product details | 15
6 720 644 143 (2010/09)