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14
5.4
Structure
26
25
24
22
23
10
11
12
14
15
13
1
2
3
4
7
8
6
5
9
21
16
27
17
20
19
18
1
Fan
2
Expansion vessel
3
Combustion chamber
4
Dual sensor (thermal safety/
delivery)
5
Compressor
6
Diverter valve
7
System filling unit
8
Domestic hot water sensor
9
Control panel
10
Domestic hot water heat
exchanger
11
Gas valve
12
Domestic water filter and flow
regulator
13
System relief valve
14
Air inlet probe (SIA) housing
15
Boiler drain
16
System pump
17
Water pressure transducer
18
Return probe
19
Automatic bleed valve
20
Water/gas capacitor
21
Burner
22
Ignition/detection electrode
23
Primary heat exchanger
24
Air evaporator
25
Inspection cover
26
Air inlet
27
Smoke outlet
28
Air inlet probe (SIA) housing
Fig. 10