Riello RL Series - 4.4 Firing rates (Fig. 3); 4.4.1 Test boiler (Fig. 4)

20111051
10
GB
Technical description of the burner
4.4 Firing rates (Fig. 3)
The RL 70 - 100 - 130 burners model can work in two ways: one-
stage and two-stage.
1st stage DELIVERY must be selected within area A of the ad-
jacent diagrams.
2nd stage DELIVERY must be selected within area B (and C for
model RL 130). 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 (RL 130) it is necessary to perform
the calibration of the combustion head as explained on pag. 12.
4.4.1 Test boiler (Fig. 4)
The firing rates were set in relation to special test boilers in ac-
cordance with the methods defined in EN 267 standards.
Fig. 4 indicates the diameter and length of the test combustion
chamber.
Example:
delivery 65 kg/hour:
diameter = 60 cm; length = 2 m.
Whenever the burner is operated in a much smaller commercial-
ly-available combustion chamber, a preliminary test should be
performed.
combustion chamber pressure mbar combustion chamber pressure mbar
combustion chamber pressure mbar
D687
Fig. 3
WARNING
The FIRING RATE area values have been ob-
tained considering a surrounding temperature of
20 °C, and an atmospheric pressure of 1000 mbar
(approx. 100 m above sea level) and with the
combustion head adjusted as shown on pag. 15.
Fig. 4
combustion chamber pressure mbar
D688