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0006080876 ed 2007/02
ONE STAGE NATURAL GAS BURNERS
A
AIR REGISTER OPENING ADJUSTER
- Reference index in position “0” register closed
register closed
- Reference index in position “6” register open
register open
B
AIR REGISTER OPENING ADJUSTER
REFERENCE INDEX
C
AIR REGULATION LOCK SCREW
D
DEFLECTOR DISK ADJUSTER SCREW
E
DEFLECTOR DISK POSITION INDEX (0 = MIN 4 = MAX for BTG 15)
DEFLECTOR DISK POSITION INDEX (0 = MIN 4 = MAX for BTG 15)
(0 = MIN 3 = MAX for BTG 20)
(0 = MIN 3 = MAX for BTG 20)
(0 = MIN 4 = MAX for BTG 28)
(0 = MIN 4 = MAX for BTG 28)
COMBUSTION ADJUSTMENT
0002934190
AIR REGULATION ON COMBUSTION HEAD
The combustion head is equipped with a regulation device, so as to open or close the air passage between disk
and head. By closing the passage, it is thus possible to obtain a high pressure upstream of the disk also for low
fl ow rates. The high air speed and turbulence allows a better penetration of the same into the fuel and therefore,
an excellent mixture and fl ame stability. It may be necessary to have a high air pressure upstream of the disk, so
as to prevent fl ame 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 fl ow of the burner ventilator suction. Of course, this condition must only occur when the burner is
operating at the maximum 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 combus-
tion head by moving it forwards or backwards so as to have a suitable air fl ow for the output,
with suction air
regulation damper sensibly open.
N.B. To facilitate the combustion head regulation, see table (n° 0002935000 for BTG 15, 0002934171 for
BTG 20 and 0002935180 for BTG 28).
When reducing the air passage on the combustion head, avoid closing it completely, which may cause
an excessive heating of the head with a consequent quick deterioration.
N.B.
Check that ignition is regular because if the controller has been moved forward, the output air speed could
be so high as to make ignition diffi cult. In such a case, it is necessary to move backwards, degree by de-
gree, the regulator until reaching the position in which the ignition is regular and accept this new position
as defi nitive.
Summary of Contents for BTG 15
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