18
5.4
Structure
23
24
25
26
27
28
17
29
30
31
32
33
1
2
3
4
5
6
10
9
13
11
12
14
15
16
18
20
21
22
19
8
7
1
Heat exchanger bleed point
2
Heat exchanger
3
Combustion chamber door
4
Oversleeve
5
Flame viewing window
6
Ignition/detection electrode
7
Return sensor (SR)
8
Heat safety thermostat
9
Delivery sensor
10
Condensate siphon
11
Diverter valve
12
System filling unit
13
Domestic hot water sensor
14
Control panel
15
Domestic hot water heat exchanger
16
Gas valve
17
Tap fittings cover
18
Domestic hot water filter
19
System relief valve
20
Boiler drain
21
System pump
22
Water pressure transducer
23
Automatic bleed valve
24
Fan
25
Air-gas mixer
26
Expansion vessel
27
Air inlet pipe
28
Air-smoke chamber
29
Smoke flue gas probe
30
Air inlet
31
Air inlet analysis take-off point
32
Smoke outlet
33
Take-off point for smoke analysis
Fig. 26