Viessmann VITOGAS Technical Manual page 7

Product information
(cont.)
Rated output
Further connection dimensions
Internal diameter of pipe to expansion
vessel
Safety valve
Blow-off line
Note
If the gas supply pressure exceeds the maximum permitted value, install a separate gas pressure governor upstream of the system.
a
b
A Subframe (accessory)
E Drain and diaphragm expansion vessel
GA Gas connection
KR Boiler return
Dimensions
Rated output kW
a mm
b mm
c mm
d mm
e mm
f mm
VITOGAS
kW 11 15
DN 15 15
R ½ ½
DN 15 15
R ½ ½
DN 20 20
R ¾ ¾
c
173
173
78
457
580
KV Boiler flow
SSI Draught hood
SV Safety flow
11 15 18
446 446 526
500 500 580
760 760 760
937 967 992
266 266 312
234 234 268
18 22 29 35
15 20 20 20
½ ¾ ¾ ¾
15 15 15 15
½ ½ ½ ½
20 20 20 20
¾ ¾ ¾ ¾
SSI
SV
KV
KR
GA
E
22 29 35
526 596 706
580 650 760
760 760 780
992 1012 1012 1012
312 359 403
268 291 357
42 48 60
20 20 20
1
¾ ¾ ¾
15 15 15
½ ½ ¾
20 20 25
¾ ¾ 1
e f
42 48 60
796 886 1076
850 940 1130
780 780 780
1082 1082
449 495 586
401 445 544
VIESMANN
7