21
Externa 30 O
Cod. 3540T540 - 04/2009 (Rev. 00)
4.2 Overall view and main components
Key
5
Sealed compartment
7
Gas inlet
10
Central heating outlet
11
Central heating inlet
14
Safety valve
16
Fan
19
Combustion chamber
20
Burner assembly
21
Main nozzle
22
Burner
26
Combustion
chamber
insulation
fig. 8
16
56
43
32
28
90
91
5
10
49
50
7
11
74
44
14
19
187
22
82
81
36
20-21
26
27
114
34
Threaded adapter ISO 7-1
27
Copper heat exchanger
28
Flue collector from heat
excanger
32
Central heating pump
34
Central heating temperature
sensor
36
Automatic air vent
43
Air pressure switch
44
Gas
valve
49
Safety
thermostat
50
Central heating limit
thermostat
56
Expansion
vessel
74
Filling
cock
81
Ignition
electrode
82
Detection
electrode
90
Flue outlet pressure test point
91
Air outlet pressure test point
114
Water pressure switch
187
Flue gas restrictor