baltur COMIST 72 DSPGM, Instruction

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REGULATION OF THE COMBUSTION HEAD AND FLAME DISK
(See BT 8608/1)
The burner is equipped with a combustion head which can be regulated (by moving it backwards or forwards) in
such a way as to close more or open more 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 air
turbulence for low inputs as well.
High velocity and air turbulence ensure a better penetration in the fuel and are therefore an optimum mixture and
allow the burner to operate with good flame stability.
High air pressure, upstream the disk, might be necessary in order to avoid flame 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 above, that the position of the device which regulates 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 between the disk and the head; this will
necessitate a considerable opening of the air shutter which regulates the flow to the burner’s fan suction.
Obviously these adjustments should be carried out when the burner is operating at maximum delivery desired.
In practice, commence regulating with the combustion head in an intermediate position, start up the burner and
make a first adjustment as previously described.
When maximum delivery desired has been reached, proceed with correcting the position of the combustion head;
move it backwards and forwards in such a way as to obtain an air flow suitable for the light oil delivery with the air
regulation shutter in suction considerably open.
It the combustion head is pushed forwards (which causes a reduction in the air passage between the head and the
disk), avoid closing it completely.
When regulating the combustion head, proceed with centering it perfectly with respect to the disk.
It must be pointed out that, 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 rapid deterioration.
A control can be carried out by looking through the spy hole situated on the back of the burner.
Then tighten home the screws that lock the combustion head in position.
The distance between the disk and the nozzle, regulated by the manufacturer, must be reduced only it the atomized
fuel cone coming out of the nozzle wets the disk and fouls it.
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 difficult.
If this happens, move it backwards, gradually, until it reaches the correct position and ignition occurs regularly.
This position should be definitive. It should be kept in mind that it is preferable, for the first flame, to limit the
amount of air to that strictly necessary in order to ensure safe ignition even in difficult circumstances.