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6.6.3
Output in 1st stage
Min output must be selected within the firing rate range shown on
page 9.
Turn switch 2)(Fig. 27, page 25) to the 1st stage position: the ser-
vomotor 1) 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 gas meter.
–
If it is necessary to reduce it, slightly reduce the angle of cam
III of the servomotor 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. 27, page 25) 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°....).
Now return to the 1st stage and measure the gas output.
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.
For any necessary adjustment of cam III, especially for small
movements, use the specific key 10)(Fig. 31) held in place
beneath the servomotor with the aid of a magnet.
Air adjustment
Progressively adjust the initial profile of the cam 4)(Fig. 30,
page 26) by turning the screws 5).
It is preferable not to turn the first screw, as this
one is used to bring the air damper to its fully
closed position.
CAUTION
6.6.4
Intermediate outputs
Adjustment of gas delivery
No adjustment of gas delivery is required.
Air adjustment
Switch off the burner by means of the switch 1)(Fig. 27,
page 25);
release the cam 4)(Fig. 30, page 26) from the servomotor by
pressing (and moving to the right) the release button on the
servomotor;
Manually rotate the cam 4) backwards and forwards several
times to make sure it moves smoothly.
Now engage the cam 4) with the servomotor again, by shift-
ing the release button to the left.
As far as possible, try not to move the screws
(previously adjusted to open the air damper in 1st
and 2nd stage) at the ends of the cam.
WARNING
Once optimum adjustment has been reached, fix it with the
screws 6)(Fig. 30, page 26).
NOTE
Once you have finished adjusting the "2nd stage - 1st stage - in-
termediate" outputs, 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 output.
Start-up, calibration and operation of the burner
1
D3922
10
Key (Fig. 31)
1
Servomotor
2
Servomotor 1) - cam 4): constrained
3
Servomotor 1) - cam 4): released
10 Spanner for adjusting cam III
27
GB
3
2
Fig. 31
20054100
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