Alpha E-Tec 30S - Page 39

39
Alpha E-Tec S 20 and 30 - Routine Servicing
Fig. 6.6
1 Expansion vessel
2 Burner
3 Viewing window
4 Ignition/sensing electrode
5 Air supply pipe
6 Primary flow temperature sensor
7 Fan
8 Condensate trap
9 Gas injector
10 Gas valve
11 Boiler drain point
12 Safety valve operation indicator
13 Test points (air A, flue F)
14 Flue temperature sensor
15 Four fixing nuts for item 16
16 Combustion chamber front assembly
17 Primary heat exchanger
18 Venturi
19 Primary return temperature sensor
20 Primary pressure switch
21 Automatic air vent
22 Boiler pump
23 3 bar safety valve
24 By-pass
AF
2
7
11
6
10
12
1
4
8
9
13
14
17
18
19
20
21
22
23
24
15
16
3
5