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0006080873_201711
IGNITION AND ADJUSTMENT WITH LIQUID
FUEL
It is recommended to first make the ignition with the liquid fuel as the
delivery is conditioned by the nozzle.
Then to regulate the gas operate the pressure regulator on the gas
train.
• Check that the nozzles fitted on the burner are suitable for the
boiler capacity. If necessary, replace them with suitable ones. In
no case should the quantity of fuel delivered exceed the maximum
amount required by the boiler and the maximum amount allowed
for the burner.
• Remember that the combustion head is designed for nozzles with
a 45° spray angle.
• Only in special cases can nozzles with a different spray angle be
used. In these cases, however, make sure that the nozzle with a
different spray angle will not cause problems, such as: blowoff, disk
or combustion head fouling, violent ignition, etc...
• Make sure that motors (fan and pump) turn in the right direction.
• Check that the discharge of combustion products through the boiler
gate and flue gate take places freely.
• Open the combustion air regulator as much as necessary (see
adjustment servomotor drawing code 0002932130).
• Open about half of the air passage between the head and disk by
operating appropriately on the adjustment screw of the flame disk.
• Disconnect the second flame thermostat to prevent its operation.
• Turn the main switch to ON to power the burner and thus ignite it.
• With the first flame burner running, adjust, if necessary, combustion
air delivery.
• The "first flame" pump pressure is 10 bar.
• When regulation is over, stop the burner and start it again to make
sure that it starts properly.
• In order to get a mild ignition, it is necessary to regulate air to the
bare minimum.
• If a mild ignition takes place, disconnect the burner from the main
switch and connect the second flame thermostat.
• Set the combustion air regulator in the position you presumably
need for adding the second flame (see adjustment servomotor
drawing code 0002932130).
• Now connect the burner again, it will begin to run with first and
second flames.
• Act on the second flame air-regulating cam for adjusting air delivery
according to specific conditions.
• The "second flame" pump pressure is 20 bar.
• The maximum rate of smoke allowed is no. 2 of Bacharach scale
with a carbon dioxide value (CO2) ranging from 10 to 13%.
• Normally, you need to decrease the air flow between disk and
head when the burner is running with limited fuel delivery, this air
flow must be proportionally larger when the burner is working with
increased fuel delivery.
• After changing this position, it is normally necessary to correct the
positions of the air control valve for the first flame and second flame
and then check that ignition takes place properly.
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