Control Box Specifications - baltur BT 40 DSN 4T Manual De Instrucciones Para La Instalación, El Uso Y El Mantenimiento

As soon as the atomized oil leaves the nozzle it is ignited by the spark from the electrodes. During
1st stage ignition the servomotor keeps the air flap in a set position according to the quantity of
fuel burnt. If a flame is ignited properly the shutdown position is passed, the ignition transformer is
switched off and the 2
Opening of the 2
nd
2 stage nozzle (n° 4/1).
nd
The pressure of 25 bars (27 - 2 = 25) acts on the nozzle closure device of the 2
pressure of 16 bars, stops fuel flowing to the second nozzle. This device is thus opened by the pressure
itself and the second nozzle starts working. A pressure of 25 bars now acts on the two nozzles. To read
off the effective pressure at the atomization unit and thus at the nozzles we recommend that you connect
the pressure gauge to the tank filter coupling (see drawing 0002932230).
NOTE: It is evident from the above that the choice of nozzles, as a function of total desired flow-rate (2 nozzles
working), must be made by taking into account the flow-rates corresponding to a working pressure of 25
bars. However, it is necessary to bear in mind that when the burner is working with the first stage only the
fuel supply rate is that which corresponds to one nozzle only as a function of 25 bars pressure.
It is obviously possible to vary the "relationship" between the first and the second stage extensively by
changing the nozzles. To ensure proper operation, always bear in mind that the fuel supply rate with the
first stage must never be less than the model-specific minimum flow-rate (see identification plate).
A lower flow-rate could make ignition difficult and combustion with the first stage only may not be good.
NOTE: Some burner models have three nozzles (see drawing n° 0002900564). In this case there are two second
stage nozzles and both are subject to a pressure of 25 bars.
From the moment in which the flame appears in the combustion chamber the burner is controlled by the photo-
resistance and the thermostats. When the temperature or pressure reaches the levels set on the thermostat or
working pressure switch that device will shut down the burner. The unit resumes normal operation automatically
when the temperature/pressure falls by the necessary amount.
If, for any reason, the flame goes out while the unit is working a (second) photoresistance cuts power to the power
relay switch and opens it; this switches off the n° 7 preventilation solenoid valve which opens and rapidly vents
the existing pressure. The atomized oil spray is intercepted by automatic closure of the nozzle shutdown devices
on the atomizing unit as soon as pressure falls below their settings.
In this case (with OR 3/B control box) the ignition stage is automatically repeated and, if the first stage is lit normally,
the burner starts working again normally too. If this is not the case (irregular or absent flame) the unit shuts down
automatically. With the LAL 1.25 control box an absent flame causes the burner to shut down without "attempting"
a second ignition. If the program is interrupted (power failure, manual work, tripped thermostat etc.) during the
preventilation stage the programmer goes to its home position and repeats the entire burner ignition sequence.
Burner Control box and
Model relative programmer
BT 40 DSN - 4T
BT 55 DSN - 4T
BT 75 DSN - 4T
BT 100 DSN - 4T
BT 120 DSN - 4T
BT 180 DSN - 4T LAL 1.25
BT 250 DSN - 4T
BT 300 DSN - 4T Cyclical relay
BT 350 DSN - 4T
stage n° 8 solenoid valve is switched on (closed in the home position).
nd
stage valve allows the fuel (at a pressure of 25 bars) to reach the closure device of the

CONTROL BOX SPECIFICATIONS

Safety time
in seconds
OR 3/B 5
5
0006080547_201610
Preventilation time
in seconds
30
22,5
19 / 38
ENGLISH
stage which, up to a
nd
Post-ignition Time between 1st
in seconds and 2nd stage
in seconds
5 5
15 7,5