1.2.5 Chimney connection/chimney system
EN 303-5 specifies that the entire flue gas system must be designed to
prevent, wherever possible, damage caused by seepage, insufficient
feed pressure and condensation.
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 technical specification sheets.
À Boiler data for constructing the flue gas system
The connection between the boiler and the chimney system should be as
short as possible. The incline of the connection should not exceed 30 -
45°. Insulate the connection.
The entire flue gas system (chimney and connection) must be calculated
as per ÖNORM/DIN EN 13384-1 or prior standards
ÖNORM M 7515/DIN 4705-1.
Local regulations and other statutory
regulations also apply.
The chimney must be authorised by a
smoke trap sweeper or chimney sweep.
As per TRVB H 118 (only in Austria) an
explosion flap must be installed in the
flue pipe or in the chimney.
Draught limiter
We recommend that a draught limiter is
fitted (1)
Install the draught limiter directly under
the mouth of the flue line, as the
pressure is lower at this location.
Boiler data for constructing the flue gas system
Description Units 70 85 100
Flue gas temperature RL
PL
°C
170
120
170
120
190
120
Flue gas mass flow RL
PL
kg/s
0.052
0.021
0.063
0.026
0.077
0.031
Required feed pressure RL
PL
mbar
0.10
0.06
0.10
0.06
0.15
0.08
Flue pipe diameter mm 200 200 200
RL = Rated load, PL = Partial load;
1
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