Download pdf

3 - MAIN COMPONENTS
1 - Automatic air vent
2 - Air intake and flue gas
discharge fitting (venting system)
3 - NTC7 flue gas sensor
4 - Air drum
5 - Air/gas mixer
6 - Return unit
7 - 3 way valve
8 - NTC2 d.h.w. outlet sensor
9 - 3 way valve shell
10 - Heating pressure switch
11 - Heating circuit discharge
cock
12 - Safety relief valve
13 - Control board
14 - Lower cover
15 - Door to control box
16 - Casing
17 - NTC3 d.c.w. sensor
18 - Primary heat exchanger
19 - Ignition cables
20 - Door of sealed combustion
chamber
Figure 1 - Internal components of boiler
6