6
1.4
Structure
16
19
17
15
24
25
26
1
2
3
4
5
6
7
10
11
12
8
9
13
14
18
19
20
21
22
23
1
Heat exchanger bleed point
2
Heat exchanger
3
Combustion chamber door
4
oversleeve
5
Flame viewing window
6
Ignition/detection electrode
7
Heat safety thermostat
8
delivery sensor
9
Ventilator
10
Condensate siphon
11
diverter valve
12
system filling unit
13
Control panel
14
Gas valve
15
system relief valve
16
Boiler drain
17
system pump
18
Water pressure transducer
19
automatic bleed valve
20
air-gas mixer
21
expansion vessel
22
air inlet pipe
23
air-smoke chamber
24
smoke probe
25
air inlet
26
smoke outlet
Fig. 2