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000608220_2007/03
AIR REGULATION ON COM-
BUSTION HEAD
The combustion head is equipped
with a regulation device, so as to
open or close the air passage be-
tween disk and head. By closing
the passage, it is thus possible to
obtain a high pressure upstream
of the disk also for low flow rates.
The high air speed and turbulence
allows a better penetration of the
same into the fuel and therefore, an
excellent mixture and flame stability.
It may be necessary to have a high
air pressure upstream of the disk,
so as to prevent flame pulses. This
condition is indispensable when
the burner operates on pressurised
combustion chamber and/or with
high heating load. From what said
above it is evident that the device
closing the air on the combustion
head must be set to such position
as to
always
obtain, behind the
disk, a very high air pressure value.
It is advisable to regulate so as to
have such air closure on the head
as to require the opening of the air
damper regulating the flow of the
burner ventilator suction. Of course,
this condition must only occur when
the burner is operating at the maxi-
mum desired output.
In practice, the regulation must
start with the device that closes the
air on the combustion head in an
intermediate position, igniting the
burner for an indicative regulation
as explained above.
When the
maximum desired output
is reached, correct the position of the
device closing the air on the com-
bustion head by moving it forwards
or backwards (0002934190) so as to
have a suitable air flow for the output,
with suction air regulation damp-
er sensibly open.
N.B. To facilitate the combus-
tion head regulation, see tables
(n° 0002935000 for BTG 15ME,
0002934171 for BTG 20ME and
0002935180 for BTG 28ME).
