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4.5
Maximum dimensions
The maximum dimensions of the burner are given in Fig. 1.
Bear in mind that inspection of the combustion head requires the
burner to be opened and the rear part drawn back on the slide
bars.
mm
A
RS 150
675
(1) Blast tube: short-long
4.6
Firing rate
The maximum output should be chosen within area A of the di-
agram (Fig. 2).
The minimum output must not be lower than the minimum limit
of the diagram.
The firing rate value (Fig. 2) has been obtained
considering an ambient temperature of 20°C, an
atmospheric pressure of 1013 mbar (approx. 0m
WARNING
above sea level), and with the combustion head
adjusted as shown on page 17.
4.6.1
Firing rate based on the air density
It may happen that a burner has to operate with combustion air at
a higher temperature and/or higher altitudes.
The heating of the air and the increase in altitude produce the
same effect: the expansion of the air volume (i.e. the reduction of
its density).
The delivery of the burner fan remains essentially the same, but
3
the oxygen per m
of air, and the thrust (discharge head) of the
fan are reduced.
It is therefore important to know if the maximum output requested
from the burner at a determinate combustion chamber pressure
remains within the firing rate of the burner even with the changed
temperature and altitude conditions.
To check it, proceed as follows:
1
find the corrective factor "F", relating to the air temperature
and altitude of the system, in Tab. 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 that must remain within the firing rate.
Technical description of the burner
B
C
D
E
370
305
590
840
The dimensions of the open burner are indicated by position I.
D731
F
G
H
(1)
280-415
189
435
mbar
mbar
H2
H3
H1
D388
9
GB
I
L
M
(1)
1180-1315
214
134
Thermal power
A
Qe
Qe
Fig. 1
N
O
221
2"
Tab. D
20047386
Fig. 2
kW
kg/h
Fig. 3
20054100
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