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Start-up, calibration and operation of the burner
5
Adjustment of gas delivery
Measure the gas delivery on the meter.
A guideline indication can be calculated from the table on page
38, simply read off the gas pressure on the pressure gauge, see
Fig. 30 on page 21, and follow the instructions on page 38.
- If delivery needs to be reduced, diminish outlet gas pressure;
if it is already very low, slightly close the VR adjustment valve.
- If delivery needs to be increased, increase the adjuster outlet
gas pressure.
Adjusting air delivery
Progressively adjust the end profile of cam 4)(Fig. 28) by turning
the cam adjustment screws 7).
- Turn the screws clockwise to increase air delivery.
- Turn the screws anticlockwise to reduce air delivery.
Minimum output
Min output must be selected within the firing rate range shown
on page 7.
Press the button 2)(Fig. 27) "output reduction", and keep it
pressed until the servomotor has closed the air damper and the
gas butterfly valve at 20° (adjustment made in the factory).
Adjustment of gas delivery
Measure the gas delivery on the meter.
- If it is necessary to reduce it, reduce slightly the angle of
cam III (Fig. 29) with small, regular movements, i.e. bring it
from an angle of 20° to 18° - 16°....
- If it is necessary to increase it, press slightly the button "output
increase" 2)(Fig. 27) (open by 10-15° the gas butterfly valve),
increase the cam III angle (Fig. 29) with small, regular move-
ments, i.e. bring it from an angle of 20° a 22° - 24°....
Then press the button "output reduction" until the servomotor
is in the position of minimum opening position and measure
gas delivery.
NOTE
The servomotor follows the adjustment of cam III only when the
angle of the cam is reduced. If it is necessary to increase the
angle of the cam, you must first increase the angle of the servo-
motor by means of the "output increase" key, then increase the
angle of cam III, and finally bring the servomotor to the position
of MIN output, with the "output reduction" key.
For any necessary adjustment of cam III, mainly for small move-
ments, the specific key 10) can be used.
Adjusting air delivery
Progressively adjust the end profile of cam 4) by turning the cam
adjustment screws 5). It is preferable not to turn the first screw
since this is used to set the air damper to its fully closed position.
Intermediate outputs
Adjustment of gas delivery
No adjustment of gas delivery is required.
Adjusting air delivery
Press slightly the button "output increase" 2)(Fig. 27) so that the
servomotor rotates by 15°. Adjust the screws until optimal com-
bustion is obtained. Proceed in the same way with the other
screws. Take care that the cam profile variation is progressive.
Switch the burner off with switch 1)(Fig. 27), OFF position.
Release cam 4 from the servomotor by pressing and shifting
button 3) to the right, and check several times that by rotating
cam 4 forwards and backwards by hand, the movement is soft
and smooth, without jamming.
Now engage cam 4) again to the servomotor by shifting button
2) to the left.
20032905
As far as is possible, try not to move those screws at the ends of
the cam that were previously adjusted for the opening of the air
damper to MAX and MIN output.
Once optimum adjustment has been reached, fix it with the
screws 6).
NOTE
Once you have finished adjusting outputs MAX - MIN - INTER-
MEDIATE, check ignition once again: noise emission at this
stage must be identical to the following stage of operation. If you
notice any sign of pulsations, reduce the ignition stage delivery.
1 Servomotor
2 Servomotor 1) - cam 4): constrained
3 Servomotor 1) - cam 4): released
4 Adjustable profile cam
5 Screws for adjusting the adjustable profile
6 Screws for fixing adjustment
7 Screws for adjusting the end profile
8 Graduated sector for gas butterfly valve
9 Index for graduated sector 8
10 Spanner to adjust cam III
D891
10
D3922
20
GB
Fig. 28
3
2
Fig. 29
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