"25 - 30 BF" models
8
10
11
12
70
9
KEY
1 Control panel
2 Circulation pump
3 Air relief valve
4 Burners
5 Expansion vessel
6 C . H . sensor (SM1/SM2)
7 Air pressure switch
8 Fan
9 Bithermal exchanger
10 Ignition/detection electrode
11 D .H .W . sensor (SS)
12 Gas valve
7
6
5
4
3
2
1
Fig . 3/a