14
5.4
Structure
22
23
24
25
26
27
14
15
16
17
19
20
21
18
1
2
3
4
5
6
8
11
12
13
9
10
28
29
7
1
Heat exchanger bleed point
2
Heat exchanger
3
Combustion chamber door
4
Air/gas duct
5
Flame viewing window
6
Ignition/detection electrode
7
Return sensor (SR)
8
Safety thermostat (TS)
9
Delivery sensor (SM)
10
Fan
11
Condensate siphon
12
Diverter valve
13
Domestic hot water sensor (SS)
14
Control panel
15
Domestic hot water heat exchanger
16
Gas valve
1
Heat exchanger bleed point
2
Domestic hot water filter
3
System relief valve
4
Boiler drain
5
Pump
6
Water pressure transducer
7
Automatic bleed valve
8
Air-gas mixer
9
Expansion vessel
10
Air inlet pipe
11
Air-smoke chamber
12
Exhaust sensor (SF)
13
Air inlet
14
Exhaust outlet
Fig. 5