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Doc653/30CV02A
Due to the high effi ciency, there may be condensate formation in the chimney even at high water
temperatures.
y
The condensate drain should never be blocked!
A direct connection to a brick chimney is not permissible, since the chimney losses must be less
than 17%.
The following table gives the fl ue gas data for all the types
Type
Maximum fl ue gas tem-
perature at full load
Quantity of fl ue gas at
full load
Maximum permissible fl ue
resistance
°C
m
3
/h
kg/s
mbar
R30/45
70
74
0.020
1.4
R30/65
70
113
0.031
1.4
R30/85
70
149
0.041
1.4
R30/100
70
168
0.046
1.4
R30/120
70
209
0.058
2.0
Table 5 fl ue gas data
Load
100%
Flow temperature 80
°C
Return temperature
60 °C
5.3.4.4 Flue
Flue length
Since the boiler is equipped with a “premix burner” with a fan, an overpressure is created in the
boiler. This overpressure is suffi cient to overcome the resistance of the burner, the heat exchang-
er, and the chimney.
The back pressure outside the boiler depends on:
a. the resistance of the fl ue pipe
b. the degree of cooling of the combustion gases
c. the resistance of the discharge outlet
The degree of cooling of the combustion gases depends on the following:
a. the insulation value of the fl ue
b. the ambient temperature
c. the fl ue system and outlet
There is a maximum overpressure of around 1.4 mbar (140 pa) for the types 45, 65, 85, 100 and
2.0 mbar (200 pa) for the type 120 in the boiler for the fl ue gas discharge system.
Calculation of diameter and length
For the calculation and control of the inner diameter of a discharge system with mechanical dis-
charge, please refer to the applicable national and local standards and regulations.
Summary of Contents for ECONOFLAME R30
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