Immergas 3.018921, Instruction And Warning Booklet

Page: 9 / 24

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