Viessmann VITOPLEX 300 Type TX3A - Sizing the flue system; Chimney diagrams

x < 1,5 m
a ≥ 1,0 m
≥ 0,4 m
≥ 1,0 m
≤ 20°
≥ 1,0 m
≥ 1,0 m
If x < 1.5 m, then a
≥
1.0 m
a ≥ 1,0 m
≥ 0,4 m
> 20°
x < 1,5 m
≥ 2,3 m
≥ 2,3 m
≥ 2,3 m
If x < 1.5 m, then a
≥
1.0 m
Sizing the flue system
Calculating the cross-sections of the flue gas system is a basic and
essential requirement for the correct function of any flue gas system.
Standard values:
■ Flue gas temperature at the boiler flue outlet 140 to 190 ºC and
ambient temperature + 15 ºC.
■ The effective flue system height equals the height difference
between the boiler flue outlet and the flue gas terminal.
■ Length of the connecting piece max. ¼ of the effective flue system
height, but not more than 7 m. The connecting piece and the flue
system should have the same cross-section.
■ We recommend that flue gases enter the flue system at an angle of
less than 45º.
■ Plug-in flue systems are not recommended.
Chimney diagrams
Check when applying the following diagrams whether the parameters
for calculating the flue gas temperature, length of connecting piece and
of the drag coefficient have been maintained. In the case of more
severe deviations, the technical departments of flue system manufac-
turers will calculate cross-sections which are accurately matched to
each individual project.
Design information
(cont.)
OIL/GAS BOILERS
VIESMANN
33
5822 426 GB
10