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4
Trace a vertical line from point A (Fig. 3), and find the maxi-
mum pressure " H2" of the firing rate.
5
Multiply "H2" by "F" to obtain the maximum lowered pres-
sure "H3" of the firing rate
H3 = H2 x F (mbar).
–
If "H3" is greater than "H1" (Fig. 3), the burner can supply
the required output.
–
If "H3" is less than "H1" , it is necessary to reduce the burn-
er output.
The reduction in output is accompanied by a reduction in the
combustion chamber pressure:
Qr = reduced output
H1r = reduced pressure
Average baro-
Altitude
metric pressure
m. above sea
mbar
level
0
1013
100
1000
200
989
300
978
400
966
500
955
600
944
700
932
800
921
900
910
1000
898
1200
878
1400
856
1600
836
1800
815
2000
794
2400
755
2800
714
3200
675
3600
635
4000
616
4.7
Test boiler
The burner/boiler combination does not pose any problems if the
boiler is EC approved and its combustion chamber dimensions
are similar to those indicated in the diagram (Fig. 4).
If the burner must be combined with a boiler that has not been EC
approved and/or its combustion chamber dimensions are clearly
smaller than those indicated in the diagram, consult the manufac-
turer.
The firing rates were established in special test boilers, according
to EN 676 regulations.
In Fig. 4 you can see the diameter and length of the test combus-
tion chamber.
Example:
Output 756 kW - diameter 60cm - length 2m.
20054100
Technical description of the burner
0
5
10
1.087
1.068
1.049
1.073
1.054
1.035
1.061
1.042
1.024
1.050
1.031
1.013
1.037
1.018
1.000
1.025
1.007
0.989
1.013
0.995
0.977
1.000
0.982
0.965
0.988
0.971
0.954
0.977
0.959
0.942
0.964
0.946
0.930
0.942
0.925
0.909
0.919
0.902
0.886
0.897
0.881
0.866
0.875
0.859
0.844
0.852
0.837
0.822
0.810
0.796
0.782
0.766
0.753
0.739
0.724
0.711
0.699
0.682
0.669
0.657
0.661
0.649
0.638
10
Qr
2
( )
H1r = H1 x
Q
Example , 5% reduction in output:
Qr = Q x 0.95
2
H1r = H1 x (0.95)
With the new values - Qr and H1r - repeat steps 2 - 5.
The combustion head should be adjusted in rela-
tion to the equivalent output Qe .
WARNING
F
(Air temperature °C)
15
20
1.031
1.013
1.017
1.000
1.006
0.989
0.995
0.978
0.983
0.966
0.972
0.955
0.960
0.944
0.948
0.932
0.937
0.921
0.926
0.910
0.914
0.898
0.893
0.878
0.871
0.856
0.851
0.836
0.829
0.815
0.808
0.794
0.768
0.755
0.726
0.714
0.687
0.675
0.646
0.635
0.627
0.616
D715
GB
25
30
40
0.996
0.980
0.948
0.983
0.967
0.936
0.972
0.956
0.926
0.962
0.946
0.916
0.950
0.934
0.904
0.939
0.923
0.894
0.928
0.913
0.884
0.916
0.901
0.872
0.906
0.891
0.862
0.895
0.880
0.852
0.883
0.868
0.841
0.863
0.849
0.822
0.842
0.828
0.801
0.822
0.808
0.783
0.801
0.788
0.763
0.781
0.768
0.743
0.742
0.730
0.707
0.702
0.690
0.668
0.664
0.653
0.632
0.624
0.614
0.594
0.606
0.596
0.577
Tab. E
Fig. 4
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