Immergas 3.020857, Instruction Booklet And Warning

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1.16 BOILER COMPONENTS.
Key:
1 - Flue hood
2 - System pressure switch
3 - Boiler pump
4 - Gas valve
5 - System filling valve
6 - Flue safety thermostat
7 - Flow probe
8 - Primary heat exchanger
9 - Safety thermostat
10 - Combustion chamber
11 - Ignition and detection electrodes
12 - System expansion vessel
13 - Burner
14 - Vent valve
15 - Three-way valve (motorised) (optional)
16 - System draining valve
17 - By-pass
18 - 3 bar safety valve
N.B.: connection group (optional)