baltur TBML 160 PN, Manual Instructions For Use

Page: 56 / 76

1
7
8
2 3
5
4
6
10
9
dis
pla
y T
BM
L 8
0 P
N
GAS
OIL
18 / 36
0006081428_201406
ENGLISH
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
1 Main switch ON - OFF
2 Power LED
3 Fan LED
4 Transformer ON led
5 2
nd
stage LED
6 1
st
stage LED
7 Appliance shutdown LED
8 Appliance unlock button
9 Fuel fill button
10 Fuel switch
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
nd
flame
allows the diesel fuel, at a pressure of 12 bar, to reach the 2
nd
nozzle
and the burner to operate at 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.
! 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 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.