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Adjusting air delivery
Progressively adjust the end profile of cam 4)(Fig. 36) by turning
the screws 7).
Turn the screws clockwise to increase air delivery.
Turn the screws counter-clockwise to reduce air delivery.
7.7.3
MIN burner output
Min output must be selected within the firing rate range shown on
page 11.
Press button 2)(Fig. 35 at page 28) "output reduction" until the
servomotor has closed the air gate valve and the gas butterfly
valve to 30° (factory set adjustment).
Adjusting gas delivery
Measure the delivery of gas from the gas meter.
If this value is to be reduced, decrease the angle of cam III
(Fig. 37) slightly by proceeding a little at a time until the
angle is changed from 30° to 28° - 26°....
If it has to be increased press the button "output increase"
2)(Fig. 35 at page 28) (i.e. open the gas butterfly valve by
10-15°), increase the cam III angle (Fig. 37) with small suc-
cessive movements, i.e. take it from angle 30° to 32° - 34°...
Then press the button "output decrease" until the servomo-
tor is taken to the minimum opening position and measure
the gas delivery.
Note
The servomotor follows the adjustment of cam III only when the
cam angle is reduced.
If it is necessary to increase the cam angle, first increase the ser-
vomotor angle with the key "output increase", then increase the
cam III angle, and finally bring the servomotor back to the MIN
output position with the key "output decrease".
In order to adjust cam III, especially for fine movements, the
key 10)(Fig. 37), held by a magnet under the servomotor,
can be used.
Adjustment of air delivery
Progressively adjust the starting profile of cam 4)(Fig. 36) by turn-
ing the screws 5).
It is preferable not to turn the first screw since this is used to set
the air gate valve to its fully-closed position.
Start-up, calibration and operation of the burner
D1710
Key Fig. 36
1
Servomotor
2
Servomotor 1) - Cam 4): engaged
3
Servomotor 1) - Cam 4): disengaged
4
Adjustable profile cam
5
Cam starting profile adjustment screws
6
Adjustment fixing screws
7
Cam end profile adjustment screws
8
Graduated sector for gas butterfly valve
9
Index for graduated sector 8
10 Key for cam III adjustment
29
GB
Fig. 36
D889
Fig. 37
20035573
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