baltur GI 350 ME Instrucciones página 22

1 Air regulation servomotor
2 Air pressure switch
3 Maximum gas pressure switch
4 Gas supply modulating throttle valve
5 Main flame gas valve
6 Valve seal control device (integral with the
control box) with pressure gauge
7 Safety gas valve
8 Minimum gas pressure switch
9 Gas pressure regulator
AIR REGULATION ON THE COMBUSTION HEAD
The combustion head is equipped with a regulating device which closes (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 for low inputs as well. High velocity and air turbulence ensure a better
penetration in the fuel, an optimum mixture and good flame stability. It might be necessary to have high air
pressure upstream the disk 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 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 flow to the
burner's fan suction. Obviously, these adjustments should be carried out when the burner is operating at maximum
delivery described. 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 has been 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 flow
suitable to the delivery, with the air regulation shutter in suction considerably open. 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 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 at the back of the burner; 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 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.
AIR / GAS PRINCIPLE DIAGRAM
(See BT 8769/2)
22
10 Gas filter
11 Anti-vibration coupling (not included)
12 Ball valve (not included)
13 Gas regulation servomotor
N° 0002910900
REV.:08/11/2004