2.4.8 Chimney connection/chimney system
EN 303-5 specifies that the entire flue gas system must be designed to prevent, wher‐
ever possible, damage caused by seepage, insufficient feed pressure and condensa‐
tion. Please note in this respect that flue gas temperatures lower than 160K above
room temperature can occur in the permitted operating range of the boiler.
The flue gas temperatures (for clean systems) and additional flue gas values can be
found in the table below.
The connection between the boiler and the chimney system should be as short as
possible. The upward angle of the connection should not exceed 30° - 45°. Insulate
the connection. The entire flue gas system - chimney and connection - should be cal‐
culated in accordance with EN 13384-1.
Local regulations and other statutory regulations also apply.
NOTICE! The chimney must be authorised by a smoke trap sweeper or chimney
sweep.
Draught limiter
The installation of a draught limiter is recommended.
NOTICE! Install the draught limiter directly under the mouth of the flue line, as the
pressure is constantly low at this point.
Boiler data for planning the flue gas system
Description
S3 Turbo
18
28
36
45
Flue gas temperature at nominal load
°C
150
170
150
170
Flue gas temperature at partial load
-
120
110
120
Flue gas mass flow at nominal load
kg/s
0.016
0.022
0.026
0.033
Flue gas mass flow at partial load
-
0.011
0.013
0.016
Required feed pressure at nominal load
mbar
0.08
0.08
0.08
0.08
Required feed pressure at partial load
-
0.08
0.08
0.08
Maximum permissible feed pressure
as per ÖNORM/DIN EN 303-5
Flue pipe diameter
mm
150
150
150
150
Safety
2
Design Information
Installation Instructions S3 Turbo | M1080813_en
13
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