Description Of The Boiler; Design - Vaillant ecoTEC VU 656/4 Installation And Maintenance Instructions Manual

2 Description of the boiler

2 Description of the boiler
2.1

Design

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Fig. 2.1 Functional components
Legend:
1 Connection for the flue pipe
2 Heat exchanger
3 Air intake pipe
4 Compact thermal module with gas valve, fan,mixing tube,
burner door and burner
5 Ignition electrode
6 Water pressure sensor
7 Pump
8 Connection provision - filling (combined filling and emptying
valve)
9 Connection provision - expansion vessel
10 Electronic box
11 Siphon
12 Flow line drainage opening
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13 Connection provision - expansion relief valve
14 Gas valve
15 Air separation system
16 Volume flow sensor
17 Automatic air vent
18 Flow switch with control lines
h Note!
When using accessories observe the minimum
separations/mounting clearances (see
Chap. 4.5).
Installation and maintenance instructions ecoTEC 0020029173_01
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