Equipment Features - baltur BT 40 DSN 4T Manual De Instrucciones

The selection of the nozzles in function of the desired total
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flow rate (2 nozzles in operation) must be made accounting
for the flow rate values that correspond to the operating
pressure of 25 bar.
It must be kept in mind that when a burner is operating with only
the first stage on, the fuel delivery corresponds to only one nozzle
operating at a pressure of 25 bar. It is possible to vary widely the
ratio between the first and second stage by replacing the nozzles.
In order to ensure proper operation, fuel delivery with the first stage
must not be lower than the minimum flow rate indicated on the burner
model data plate. A lower flow rate could make ignition difficult and
combustion with only the first stage may not be satisfactory.
Some burner models use three nozzles (0002900564 pagina
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<OV>) in this case there are two second stage nozzles and
both are subjected to a pressure of 25 bar.
Once the flame appears in the combustion chamber, the burner
is commanded and controlled by the photoresistors and by the
thermostats. When the temperature or pressure reach the value to
which the operating thermostat or pressure switch is calibrated, its
intervention will cause the burner to stop.
The equipment returns to automatic operation when the temperature
or pressure has decreased sufficiently. If for any reason the
flame goes out during operation, the photoresistor will intervene
immediately (one second). The photoresistor will stop the feed
from the corresponding relay, open it, and therefore deactivate the
washing solenoid valve (7). This, when opening, will quickly release
the existing pressure and the spray of atomized oil will be stopped by
the automatic closure of the spray nozzle unit valve closing devices
as soon as the pressure goes below the value to which they are set.
In this case, with equipment model OR 3/B, the ignition phase is
repeated automatically and, if the first flame reignites normally, the
burner will return to normal operation. Otherwise (irregular flame or
no flame), the equipment will shut down automatically.
If equipment model LAL 1.25 is used, in the absence of flame,
the burner will shut down without attempting a second ignition.
If the program is interrupted (power failure, manual intervention,
thermostat intervention, etc...) during the pre-washing phase the
programmer will return to its initial position and will repeat the entire
burner ignition phase.

EQUIPMENT FEATURES

Equipment and relevant
Burner Model
BT 40 ÷ 100 DSN 4T
BT 120 ÷ 350 DSN 4T LAL 1.25 Cyclic relay
Safety time (in
programmer seconds)
OR 3/B 5
5
20 / 40
0006081310_201211
FUNCTIONAL DESCRIPTION OF
TWO-STAGE BURNERS
OPERATION WITH SECOND STAGE THERMOSTAT AND
BOILER THERMOSTAT
The two-stage burner always turns on with reduced fuel and air
supply (first stage). Then, after a few seconds, it switches to the
fully operational status (second stage).
The activation of the second stage can take place after the
consensus of the equipment and of the control device (pressure
switch and thermostat). When the burner is fully operational, it
remains in this status until the pressure value set on the control
device (pressure switch or thermostat) is reached.
After this, the control device is triggered and disables the second
stage. The burner thus switches back to first stage.
As soon as the temperature or pressure decrease and reach the
value set on the second stage control device (pressure switch or
thermostat) the burner will switch to the second stage. The burner
stops completely when, with first stage activated, the threshold value
set on the control device (pressure switch or thermostat) is reached.
The equipment restarts automatically when the pressure or
temperature decreases below the value to which the pressure switch
or thermostat is regulated.
OPERATION WITH BOILER THERMOSTAT
The two-stage burner must operate so that, under normal conditions
in the second stage, it stops completely when the pre-established
temperature is reached, without switching to the first stage. To obtain
this operating condition, do not install the second stage thermostat
and make a direct connection (bridge) between the respective
equipment terminals. In this way, only the burner's capacity will
be used for ignition at a reduced flow rate for a soft start, which is
an essential condition for boilers with a pressurized combustion
chamber, but also very useful for normal boilers (vacuum combustion
chamber). The burner command (on or off) is connected to the
operating or safety thermostats.
It is not recommended to allow the two-stage burner to
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operate for long periods of time at the first stage. In fact, if
the boiler operates at a temperature below 180° C, it is very
probable that acid condensate and soot will form inside it,
causing its rapid clogging and corrosion.
Pre-ventilation time
(in seconds)
30
22.5
Time between 1
st
Post-ignition
and 2 flame
nd
in seconds
in seconds
5 5
15 7.5