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Air adjustment
Progressively adjust the end profile of cam 3)(Fig. 29) by turning
the screws 5).
Turn the screws clockwise to increase air delivery.
Turn the screws anticlockwise to reduce air delivery.
D518
1
Servomotor
2
Cam 4 engaged/
3
Cam cover
4
Variable profile cam
5
Screws for adjusting the adjustable profile
6
Opening for access to screws 5
7
Index for graduated sector 8
8
Gas butterfly valve graduated sector
5.5.3
Output in 1st stage
1st stage output must be selected within the firing rate range
indicated on page 20.
Move the switch 2)(Fig. 28 on page 24) in "1st STAGE" position:
the servomotor 1)(Fig. 29) will close the air damper and, at the
same time, will also close the gas butterfly valve to 15°, i.e. to the
factory setting.
Adjustment of gas delivery
Measure the gas delivery on the meter.
–
If it is necessary to reduce it, slightly decrease the angle of
orange lever (Fig. 33 on page 28) with small, regular
movements, i.e. bring it from an angle of 15° to 13° - 11°...
–
If it is necessary to increase it, pass to 2nd stage by activating
switch 2)(Fig. 28 on page 24) and slightly increase the angle
of the orange lever with small, regular movements, i.e. bring
it from an angle of 15° to 17° - 19°...
Then go back to 1st stage and measure the gas delivery.
NOTE:
The servomotor only follows the adjustment of the orange
lever when the angle of the cam is reduced. If the angle
needs to be increased, pass to the 2nd stage and increase
the angle, then return to the 1st stage to check the effect of
the adjustment.
Adjustment of air delivery
Progressively adjust the initial profile of the cam 3)(Fig. 29) by
turning the screws 4).
If possible, do not turn the first screw, since this is
used to set the air damper to its fully closed posi-
tion.
CAUTION
20191684
Start-up, calibration and operation of the burner
disengaged
5.5.4
Intermediate outputs
Adjustment of gas delivery
No adjustment is required
Adjustment of air delivery
Turn off the burner using the switch 1)(Fig. 28 on page 24) and
turn the intermediate screws of the cam so that the cam tilt is
progressive.
Pay attention not to move the screws at the ends of the cam,
previously adjusted to open the air damper in 1st and 2nd stage.
NOTE:
Once adjustment of "2nd stage - 1st stage - intermediate"
outputs has been completed, recheck the ignition: its noise
must be equal to the one of the following operation.
If you notice any sign of pulsations, reduce the ignition
stage delivery.
Fig. 29
26
GB
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