Idiomas disponibles
Idiomas disponibles
DESCRIPTION OF WORKING
E
N
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,
G
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
L
about 180° C in the case of heavy oil and 130° C with light oil), causing
soot to build up at the flue. In addition, when the boiler is working at
I
lower output than that indicated in the technical data, it is likely that
acidic condensate and soot will form in the boiler with the result that it
S
will quickly corrode and get clogged up. When the two-flame burner is
installed on a hot water boiler for heating use, it must be connected so
H
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's thermostat, and
make a direct bridge connection between the equipment's terminals.
In this way only the burner's capacity to switch on at low rate is used
for a gentle ignition, which is essential for boilers with a pressurised
combustion chamber and also very useful for normal boilers with
depression combustion chamber.
The boiler's start - stop is subject to the usual running or safety
thermostats.
TBL 45LX
Switch off the master switch and the I/O switch on electrical panel. If
the thermostats are closed, the voltage reaches the command and
control equipment which starts it working. The fan motor and the ignition
transformer are then switched on. The motor turns the fan that carries
out an air wash of the combustion chamber and at the same time of
the fuel pump that cause circulation in the ducts that expels any gas
bubbles through the return valve. This pre-wash stage ends with the
opening of the safety solenoid valves and the first flame, which allows
the fuel at a pressure of 12 bar to get to the first flame's nozzle and
from this to enter the combustion chamber finely atomised. 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 the first flame ignition
the combustion air is determined by the position of air adjustment servo
motor (see first flame adjustment 0002935210).
If the flame appears normally, with the safety time set by the electrical
equipment passed, this switches on the solenoid valve (closed at rest)
of the second flame (if the air adjustment servo motor is used, see
0002935210). The opening of the 2nd flame allows the light oil, at a
pressure of 12 bar, to reach the 2nd nozzle and, at the same time, the
control piston for the combustion air adjuster moves down to open the
adjuster further. The travel distance of the piston can be registered
with the screw with locking nut, the burner is thus working at full rate.
From when the flame appears in the combustion chamber the burner
is controlled by the photoelectric cell and the 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, the latter stops
the burner. Subsequently, 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 working
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 nozzles flow. The switch
on stage is thus 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. 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.
TBL 75LX
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 at the same
time of the fuel pump that cause circulation in the ducts that expels 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 get to the first flame's
nozzle and from this to enter the combustion chamber finely atomised.
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 air regulation
servomotor cam III (see 0002935210). If the flame appears in a normal
manner, once the safety time foreseen by the electric equipment has
passed, it activates the 2nd flame solenoid valve (closed, in stand-by).
The opening of the 2nd flame valve allows the diesel, at a pressure of
12 bar, to reach the 2nd nozzle and, at the same time, the combustion
air regulation servomotor moves to the 2nd flame position as adjusted
by cam IV (see 0002935210). In this way the burner is fully operational.
From when the flame appears in the combustion chamber the burner
is controlled by the photoelectric cell and the 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, the latter stops
the burner. Subsequently, 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 working
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 nozzles flow. The switch
on stage is thus 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.
Note:
It is clear from the above that the choice of nozzles, depending 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 light oil. It is of course possible to vary within wide limits
the relationship between the first and the second flames by replacing
the nozzles.
16 / 82
0006081324_201612
