baltur TBML80 PN Manual De Instrucciones página 19

DESCRIPTION OF OPERATION WITH DIESEL OIL
FURTHER INSTRUCTIONS TO START A MIXED BURNER
It is advisable to perform the first ignition with liquid fuel because
in this case delivery is conditioned by the available nozzle whereas
the delivery of methane can be varied as you like by adjusting its
delivery regulator.
It is not advisable to have too large a burner for the boiler for
heating and for hot water as the burner may work for long periods
with a single flame, making the boiler work at lower than required
output; as a result of this the combustion products (fumes) emerge
at too low a temperature (at about 180° C in the case of heavy oil
and 130° C with diesel fuel), causing soot to build up at the flue.
In addition, when the boiler is working at lower output than that
indicated in the technical data, it is likely that acidic condensate and
soot will form in the boiler, causing corrosion and clogging. When
the two-flame burner is installed on a hot water boiler for heating
use, it must be connected so that it works normally with both flames,
completely stopping without passing to the first flame when the
preset temperature is reached. So that it works in this way, do not
install the second flame thermostat, and make a direct connection
between the equipment's terminals (jumper). This ensures that
only the capability of the burner to ignite at low capacity is used for
a gentle ignition, which is essential for boilers with a pressurized
combustion chamber and also very useful for normal boilers with
depression combustion chamber. The ignition on/off command is
subject to the usual operating or safety thermostats.
By switching off switch 1, if the thermostats are closed, the
voltage reaches the command and control equipment (switching
on LED 2) which starts it working. The fan motor (LED 3)
and the ignition transformer (LED 4) are then switched on.
The motor turns the fan that carries out an air wash of the
combustion chamber and fuel pump to cause
circulation in the ducts and will expel any gas
bubbles through the return valve. This pre-
wash stage ends with the opening of the safety
solenoid valves and the first flame (LED 5), which
allows the fuel at a pressure of 12 bar to reach
the first flame nozzle and from this to enter the
combustion chamber finely atomized. As soon
as the vaporized fuel leaves the nozzle it is lit by
the charge between the electrodes on the start
of the motor. During first flame ignition, the air
shutter is held in the position set on the special
air regulation servomotor cam (0002935210). If
the flame appears regularly, after the safety time
foreseen by the electrical device, it starts the air
regulation servomotor that moves to the second
flame position. During passage from the first to
the second flame, the servomotor energizes the
solenoid valve (normally closed) for the second
flame (LED 6). The opening of the 2
allows the diesel fuel, at a pressure of 12 bar, to
reach the 2 nozzle and the burner to operate at
nd
full capacity. From the time the flame appears in
the combustion chamber, the burner is controlled
by the photoelectric cell and thermostats.
The control equipment follows the program and switches the ignition
transformer off. When the temperature or the pressure in the boiler
reaches that set by the thermostat or pressure switch, this stops
the burner. Later, when the temperature or the pressure falls below
the closing level of that of the thermostat or pressure switch, the
burner is switched back on again. If, for any reason, during the
operation of the burner the flame is lost, after just one second the
photoelectric cell reacts to cut off the power supply from that relay
to automatically switch off the solenoid valves which intercepts the
fuel flow. The ignition state is then repeated and, if the flame ignites
again normally, the burner starts working again normally, if not (if
the flame is irregular or fails to light completely) the equipment goes
automatically into lock-out (LED 7). If the program is interrupted (due
to a power supply failure, manual action or the intervention of the
thermostat, etc.) during the pre-wash stage, the programmer returns
to its starting position and will automatically repeat the whole of the
burner ignition sequence.
3
6
9
1 Main switch ON - OFF
flame
nd
2 Power LED
3 Fan LED
4 Transformer ON led
5 2 stage LED
nd
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It is clear from the above that the choice of nozzles, depend-
!
ing on the total capacity (2 nozzles working) desired, must be
made taking into account the capacity corresponding to the
working pressure of 12 bar using diesel fuel. It is of course
possible to vary within wide limits the relationship between
the first and the second flames by replacing the nozzles.
4 7
5 2
GAS
OIL
10
1 8
6 1
st
7 Appliance shutdown LED
8 Appliance unlock button
9 Fuel fill button
10 Fuel switch
stage LED
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