25
REGULATION OF THE COMBUSTION HEAD AND FLAME DISK
(See BT 8869/1)
The combustion head is equipped with a regulating device which automatically closes and opens the air passage
between the disk and the head. By throttling the passage, it is possible to achieve high pressure upstream the disk,
even for the low inputs. Consequently, high velocity and air turbulence allow a better penetration in the fuel, are an
optimum mixture and permit good flame stability. For a gas burner, it may 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 throttling of the air in the head; this will
necessitate a considerable opening of the air shutter which regulates the flow to the burner’s fan suction.
To achieve this, operate the modulation disk screws.
After regulation, remember to tighten home the locking screws of the adjustable screws.
N° BT 8869/1
AIR REGULATION PRINCIPLE DIAGRAM
WRONG REGULATION
Combustion air inlet
gates closed
Big air inlet
opening
Combustion head
CORRECT REGULATION
Combustion air inlet
gates open
Air passage near
to be closed
Attention:
Avoid to close it completely
Combustion head
Ignition electrodes
Ignition electrodes
Nozzle
Nozzle
Gas pilot
Gas pilot
Gas outlet
Gas outlet
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