Vaillant ecoTEC VU 656/4 User Manual

11Installation and maintenance instructions ecoTEC 0020029173_01
4.4 Dimension drawing and
connection dimensions
A
Ø 80/125
R 1
172
172
32
224 224
121
140
75
211
800
61
94
119
Ø 25, R1
G 1
1
/
2
Rp 1 Rp 1
G 1
1
/
2
R 3/4
480
472
6
7
5
4
3
9
11
10
8
1
2
Fig. 4.2 Connection dimensions in mm
Legend:
1 Flue gas connection, 80/125 mm
diameter, dimension A (hanging bracket – centre of air/flue gas
pipe) with 87° elbow: 297 mm
2 Hanging bracket
3 Gas pipe, 25 mm diameter, gas connection R1“
4 Connection provision - expansion vessel
5 Connection for heating return
6 Connection for heating flow
7 Connection provision - expansion relief valve
8 Connection for condensate drain pipework
9 Flow line drainage opening
10 Connection provision - filling (combined filling and emptying
valve)
11 Siphon cartridge
h
Note!
When using accessories observe the minimum
separations/mounting clearances (see
Chap. 4.5).
Assembly 4

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