Riello GAS 3, Installation, Use And Maintenance Instructions

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9 20144819 GB
Technical description of the burner
4.7 Firing rates
The burner output is selected from within the area of the dia-
grams.
This area is known as the FIRING RATE and provides the burner
output according to the pressure in the combustion chamber.
The work point may be found by plotting a vertical line from the
desired output and a horizontal line from the corresponding pres-
sure in the combustion chamber The intersection of these two
lines is the work point which must lie within the FIRING RATE.
Example:
for GAS 3 the area is delimited by:
•
the axis of the 130 - 350 kW outputs
• the axis of the pressures in the comb. chamber 0 + 7 mbar
• the maximum pressure curve in comb. chamber
If the burner develops an output of 240 kW at a pressure in com-
bustion chamber of 5 mbar, the work point is found on the maxi-
mum pressure curve. This curve has been established with safety
margins and therefore it is possible to use the entire area of the
FIRING RATE beneath this curve.
Warning:
The burner can also operate with the combustion chamber in de-
pression.
WARNING
The firing rate value (Fig. 2) has been obtained
considering an ambient temperature of 20 °C, an
atmospheric pressure of 1,013 mbar (approx. 0 m
a.s.l.), and with the combustion head adjusted as
shown on page 16.
Pre
ssu
re i
n combustion
c
hamber -
mb
ar
Heat output
Fig. 2
GAS 3
GAS 4
20144735
D289
KW
Mcal/h
KW
Mcal/h
GAS 5
GAS 6
D290
D291
Pressure
in co
mb
ustion
ch
amber -
mbar
Heat output
Heat output
Heat output