6423
10
GB
Technical description of the burner
4.4
Overall 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burner to be opened and the rear part withdrawn on the slide
bars.
The maximum dimension of the burner, without casing, when
open is given by measurement H.
Tab. B
(1)
Blast tube: short-long
4.5
Firing rate
The burners can work in two ways: one-stage and two-stage.
1st stage delivery
must be selected within area A of the
adjacent diagrams.
2nd stage delivery
must be within area B and C.
This area provides the maximum delivery of the burner in
relation to the pressure in the combustion chamber.
The work point may be found by plotting a vertical line from the
desired delivery and a horizontal line from the pressure in the
combustion chamber.
The intersection of these two lines is the work point which must
lie within area B.
In order to utilize also area C it is necessary to perform the cali-
bration of the combustion head as explained on page 15.
mm
A
B
C
D
(1)
E
F
G
H
(1)
RL 50
476
474
468
216 - 351
152
352
52
672 - 807
Fig. 1
D452
WARNING
The firing rate value (Fig. 2) has been obtained
considering an ambient temperature of 20 °C, an
atmospheric pressure of 1013 mbar (approx. 0 m
above sea level), and with the combustion head
adjusted as shown on page 17.
Fig. 2
D8760
pr
essure
mb
ar
Combustion chamber
