Gas fired wall mounted boiler
Balanced flue opera-
tion
Open flue operation
Required draught
Pa
—
1.5
coaxial
parallel
Flue outlet
Ø mm
60 / 80
80
140/150
Ventilation air inlet
Ø mm
100 / 125
80
Note
If the gas supply pressure is higher than the maximum permitted value, install a separate gas governor upstream of the system.
Balanced flue operation
A
Area for electrical supply cables
E
Drain
GA Gas connection
HR Heating return
HV Heating flow
KW Cold water
WW DHW
Note
For dimensions of on-site pipe connections, see from page 10
5822
335-1
G
B
VITOPEND 222
VIESMANN
5
Specification - Vitopend 222
(cont.)