Riello RS BLU Serie Instrucciones De Instalación, Uso Y Mantenimiento página 12

To verify, proceed as follows:
1 Find the corrective factor F, relating to the air temperature
and altitude of the system, inTab. E.
2 Divide the output Q required from the burner by F to obtain
the equivalent output Qe: Qe = Q : F (kW)
3 In the firing rate of the burner, mark the work point identified
by:
Qe = equivalent output
H1 = pressure in the combustion chamber point A)(Fig. 3)
that must remain within the firing rate.
4 Trace a vertical line from point A, Fig. 41, and find the maxi-
mum pressure H2 of the firing rate
5 Multiply H2 by F to obtain the maximum lowered pressure
H3 of the firing rate H3 = H2 x F(mbar)
– If H3 is greater than H1, as in Fig. 3, the burner can supply
the required output.
– If H3 is less than H1, it is necessary to reduce the burner out-
put. The reduction in output is accompanied by a reduction in
the combustion chamber pressure:
Qr = lower output
H1r = low pressure
Qr
2
( )
H1r = H1 x
Q
Average
Altitude barometric
pressure
m. above
mbar
sea 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
20040563
Technical description of the burner
0 5
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
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
mbar
H2
H3
H1
D388
F (Air temperature °C)
10 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
10 GB
A
Qe
Qe
25 30
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
kW kg/h
Fig. 3
40
Tab. E