baltur COMIST 122 DSPGM, Instruction

Page: 33 / 70

33
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.
GENERAL DIAGRAM AIR REGULATION
N° BT 8608/1
INCORRECT REGULATION
CORRECT REGULATION
Combustion head
Air flow large
opening
Control and fixing knobs
of combustion head
Combustion air inlet with
very locked shutter
Combustion head
Control and fixing knobs
of combustion head
Combustion air inlet with
very opened shutter
Air flow
quite locked.
Attention:
Avoid complete
locking