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5.4
Structure
23
1
2
3
4
5
6
7
8
9
Fan
1
Heat safety thermostat
2
Combustion chamber
3
4
Ignition/detection electrode
Heating delivery probe
5
Diverter valve
6
System filling unit
7
Domestic hot water sensor
8
Control panel
9
Pressure gauge
10
26
25
24
23
11
12
Secondary heat exchanger
11
Gas valve
12
Flow meter
13
14
System relief valve
Boiler drain
15
System pump
16
Water pressure switch
17
Automatic bleed valve
18
Burner
19
Primary heat exchanger
20
22
21
17
14
20
13
19
18
27
Expansion vessel
21
Combustion chamber front panel
22
Air inlet (separate ducts)
23
24
Air pressure switch
Smoke outlet
25
Air inlet (concentric ducts)
26
By-pass
27
16
15
10
Fig. 17
53
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