Air Regulation On The Combustion Head - Regulation Of The Distance Between The Disk And The Nozzle - baltur BT 15 N Manual De Instrucciones

To check the effi ciency of the photoresistant cell and of the shut down system, proceed as follows:
a) start up the burner.
b) After about one minute, extract the photoresistant cell by pulling it out of its seat and simulate fl ame failure
(using a hand or a reg to close the window in the photoresistant cell support). The following should then
occur:
- the fuel is intercepted and consequently the fl ame is extinguished.
- The pre-ventilation pre-washing phase is repeated.
c) Keep the photoresistant cell in the dark and the burner will start up again but, as the photoresistant
cell doesnot see the light, the burner will go to shut down within the time pre-set by the programmer.
The control box can only be unblocked by pressing manually the appropriate pushbutton.
3) To check the thermostat effi ciency, run the burner until the water in the tank reaches a temperature of at least
50° C. Then turn the thermostat control knob, to lower the water temperature, until an opening click is heard
which causes the burner to stop. The thermostat should trip within a maximum tolerance of 5 to 10° C in
respect to the control thermometer (boiler thermometer); if not, change the setting on the thermostat scale to
match that of the thermometer.
AIR REGULATION ON THE COMBUSTION HEAD
The combustion head is equipped with a regulating device which close (by moving forwards) and opens (by moving
backwards) the air passage between the disk and the head. By closing the passage, it is possible to achieve high
pressure upstream the disk and therefore high velocity and turbulence for the low outputs as well.
High velocity and air turbulence ensure a better penetration in the fuel and are therefore an optimum mixture;
they allow the burner to operate with a lower grade of smoke and good fl ame stability.
It might be necessary to have high air pressure upstream the disk in order to avoid fl ame pulsations and it is
considered practically indispensable when the burner is operating with a pressurized furnace and/or high thermal
load. It is evident from the above, that the device which closes the air on the combustion head should be put in
such a position as to always obtain a decidedly high air pressure value behind the disk.
It is advisable to regulate in such a way as to achieve a closing of the air on the head; this will necessitate a
considerable opening of the air shutter which regulates the fl ow to the burner's fan suction. Obviously, these
adjustments should be carried out when the burner is operating at maximum delivery desired. In practice, start
regulating by putting the device which closes the air on the combustion head in an intermediate position, start
up the burner and make trial adjustments as previously described. When maximum delivery desired
reached, proceed with correcting the position of the device which closes the air on the combustion head; move
it backwards or forwards in such a way as to obtain an air fl ow suitable to the delivery, with the air regulation
shutter in suction considerably open. shutter in suction considerably open.
When reducing the air passage on the combustion head, avoid closing it completely. When reducing the air passage on the combustion head, avoid closing it completely.
Proceed with perfect centering with respect to the disk. It must be pointed out thet, if perfect centering with respect Proceed with perfect centering with respect to the disk. It must be pointed out thet, if perfect centering with respect
to the disk is not obtained, bad combustion and excessive heating of the head could occur which would result in its to the disk is not obtained, bad combustion and excessive heating of the head could occur which would result in its
rapid deterioration. A control can be carried out by looking through the spy hole situated at the back of the burner; rapid deterioration.
then tighten home the screws that lock the position of the air regulation device on the combustion head.
Note: Check that ignition occurs regularly, because when the device has been moved forwards, it could occur that
the air velocity in exit is so high as to render ignition diffi cult. If this does happen, move it backwards, gradually,
until it reaches the correct position and ignition occurs regularly. This position should be defi nitive.
REGULATION OF THE DISTANCE BETWEEN THE DISK AND THE NOZZLE
The burners are provided with a device which permits a variation in the distance between the disk and the noz-
zle.
The distance between the disk and the nozzle has already been set by the manufacturer and should only be The distance between the disk and the nozzle has already been set by the manufacturer and should only be
reduced if the atomized fuel cone in exit from the nozzle wets the disk and fouls it up. reduced if the atomized fuel cone in exit from the nozzle wets the disk and fouls it up.
(see BT 8608/1)
33 / 59
98331 ed 2007/01
maximum delivery desired has been
with the air regulation