Vaillant ecoTEC VU 656/4 User Manual

Installation and maintenance instructions ecoTEC 0020029173_014
2 Description of the boiler
2.1 Design
1
2
3
4
5
6
7
10
9
8
14
15
11
12
13
16
18
17
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
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).
2 Description of the boiler

Vaillant ecoTEC VU 656/4 Specifications

General

Category	Boiler
Output	65 kW
Type	Condensing
Fuel Type	Natural Gas
Installation	Wall-mounted
Max. nominal heat output 80/60 °C	65 kW
Modulation range	20-100%
NOx class	5
Protection class	IPX4D
Efficiency Rating	A
Heating Circuit	Yes
Max Operating Pressure	3 bar
Efficiency	98%
DHW Circuit	No