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USE OF THE BURNER
The burner operates fully automatically; it is activated by closing the main switch and the control box switch.
Burner operations are controlled by command and monitoring devices, as described in the Chapter “Description
of Operation”. The “shut down” position is a safety position automatically taken up by the burner when a particular
part of the burner or of the system is inefficient. Therefore, it is good practice, before unblocking the burner and
starting it up again, to check that there are no defects in the heating plant.
The length of time that the burner rests in the “shut down” position is without limit.
To unblock the control box, press the appropriate push-button. “Shut down” can be caused by transitory flaws (a
little water in the fuel, air in the pipes, etc.); in these cases, if unblocked, the burner will start up normally. When,
however, the shutdowns occur repeatedly (3 or 4 times), do not persist in trying to unblock the burner, first check
that there is fuel in the tank and then call the local service to repair the defect.
MAINTENANCE
The burner does not require special maintenance, but it is good practice to perform the following operations at the
end of the heating season:
1)
Remove and wash thoroughly with solvents (petrol, trichloroethylene, oil) the filters, the nozzle, the turbolator
disk and the ignition electrodes. Avoid cleaning the nozzle with metal instruments (use wood or plastic).
2)
Clean the photoresistant cell.
3)
Have the boiler cleaned and, if necessary, also the chimney.
Note: The nozzle or nozzles should be replaced at least once every heating season. It may be necessary to
do this more often.
DESCRIPTION OF OPERATION OF TWO-FLAME BURNERS
The two-flame burner always starts up with a reduced (1st flame) fuel and air output and, after a few seconds,
switches to functioning with a full fuel and air output (2nd flame).
Insertion of the 2nd flame is subject to the consent of the control box and of the control device (pressure switch or
thermostat). When the burner is operating at full rating, it remains in this position until reaching the value at which
the pressure or temperature has been set on the control device (pressure switch or thermostat). The control
device trips and disconnects the 2nd flame (fuel and air) when the value at which it has been set is reached. The
burner remains operating with the 1st flame only.
Normally, the 1st flame alone is not sufficient to maintain the desired pressure or temperature value and therefore
it will decrease until it reaches the value at which the control device of the 2nd flame (pressure switch or thermostat)
re-connects the total air and fuel output.
The burner comes to a complete standstill when, with only the 1st flame inserted, the pressure or temperature
reaches the tripping point of the control device (pressure switch or thermostat).
The burner starts up again automatically when the pressure or temperature falls below the value at which the
pressure switch or thermostat has been set.
Note: Generally, it is not good practice to connect a burner for two-flame operations to a boiler that produces hot
water for heating purposes. In this case, the burner would operate (even for long periods of time) with only
one flame. The boiler would be insufficiently loaded and, consequently, the combustion products would
come at an excessively low temperature (less than 180 °C) creating soot at the mouth of the chimney.
When the boiler is insufficiently loaded, it is most probable that acid condensate and soot will form in the
boiler rapidly clogging and corroding it.
When a two-flame burner is mounted on a boiler producing hot water for heating purposes, it must be
connected and regulated so that it will operate with both flames and come to a complete standstill (without
passing through the 1st flame) when the pre-set temperature is reached. This can be done by refraining
from installing the 2nd flame thermostat and by making a direct connection (bridge) between the respective
terminals of the control box. In this way, we only utilize the burner’s capacity to ignite itself with a reduced
output in order to obtain soft ignition; a condition which is essential for boilers with pressurized combustion
chambers, and very useful for normal boilers (de-pressurized combustion chambers).
Burner control (ON and OFF) is subordinate to the usual operating and safety thermostats.
