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2 - MINIMUM OUTPUT
MIN output must be selected within the firing rate range indicated
on page 10.
Press button 2)(Fig. 27) "-" and keep it pressed until the
servomotor reaches 15° (factory adjustment).
Nozzle output adjustment
The nozzle flow output is given in the diagram (Fig. 28) in
correspondence with the nozzle return line pressure, measured
with the pressure gauge 10)(Fig. 29).
To vary the minimum nozzle output, change the upper cam start
profile 7)(B) using the screws 8).
Air flow adjustment
Adjust the lower cam start profile 4)(Fig. 29) by turning the
screws 5) that appear inside the opening 6).
If possible, do not turn the first screw, since this is used to set the
air damper to its fully closed position.
3 - INTERMEDIATE OUTPUTS
Oil/air output adjustment
Lightly press the "+" button 2)(Fig. 27) so that a new screw
5)(Fig. 29) appears inside the opening 6)(Fig. 29). Adjust the
screw 8)(Fig. 29) which varies the upper cam profile 7) and the
corresponding screw 5) which controls the lower cam 4) until
optimal combustion is achieved. Proceed in the same way with
the following screws except for the last screw, previously
adjusted to obtain the maximum power.
Take care that the cam profile variation is progressive.
Switch the burner off with switch 1)(Fig. 27), OFF position,
release the adjustable profile cam by setting the servomotor slot
2)(Fig. 29) in a vertical position and check several times that by
rotating the cam forwards and backwards by hand, the
movement is soft and smooth, without any hindrance.
NOTE:
The servomotor cams I - II - IV do not need to be adjusted.
Only cam III may need an intervention. In this case remove
the cover 1)(Fig. 31), inserted with a trigger catch, extract the
special key 2) from inside, and insert it in the notch of cam
III. The servomotor follows the adjustment of cam III only
when the angle of the cam is reduced. If it is necessary to
increase the cam angle (15..16..17°..), first increase the
servomotor angle by means of the "+" key, then increase the
cam III angle, and finally bring the servomotor to the position
of MIN output, with the "-" key.
Start-up, calibration and operation of the burner
Key (Fig. 29)
1
Servomotor
2
Cam 4) and 7) engaged/
3
Servomotor cam cover
4
Air damper control cam
5
Cam 4) adjustment screws
6
Slit to access the screws 5)
7
Pressure variator control cam
8
Cam 7) adjustment screws
9
Pressure variator
10 Pressure
gauge
measurement
11 Air damper
12 Contents
25
GB
disengaged)
for
nozzle
return
line
D871
D869
Fig. 29
pressure
Fig. 30
D793
Fig. 31
20167399
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