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6.10
Burner adjustment and output modulation
6.10.1 Maximum output
The servomotor (Fig. 35 a pag. 31) must be adjusted to the
maximum opening so that the air dampers are completely open.
6.10.2 Minimum output
MIN output must be selected within the firing rate range indicated
on pag. 10.
Turn the selector 4)(Fig. 33) "output reduction", and keep "-"
pressed until the servomotor has closed the air damper and the
gas butterfly valve at 35° (adjustment made in the factory).
Air adjustment
The starting profile of cam 1)(Fig. 37) must be progressively
adjusted by turning the screws 2)(Fig. 37).
If possible, do not turn the first screw, since this is
used to set the air damper to its fully closed
position.
WARNING
6.10.3 Intermediate outputs
After adjusting the maximum and minimum output of the burner,
carry out air and gas adjustment on several intermediate
positions of the servomotor.
The passage from one position to the next one is obtained by
pressing the selector 4)(Fig. 33) on the symbol "+" or "-".
For better adjustment repeatability, take care to stop the rotation
of the cam unit when the upper bearing that slides on the profile
4)(Fig. 37) is aligned with one of the adjustment screws 2).
6.11
Air / fuel adjustment
The following adjustments must be performed during the
calibration of the air/fuel ratio:
A
Oil pump outlet pressure:
turn screw 5)(Fig. 21 a pag. 22), on the pump.
B
Air cam:
turn the adjustment screws 2)(Fig. 37) after having loosened
screws 3).
C
Gas cam:
turn the adjustment screws 2)(Fig. 37) after having loosened
screws 3).
D
Oil cam:
modify the eccentricity by turning the screw 7)(Fig. 38) after
having loosened the screws 6).
By tightening the screw 7) the eccentricity increases,
thereby increasing the difference between the maximum
and minimum return pressure of the nozzle.
20148180
Start-up, calibration and operation of the burner
Screw or unscrew the pre-set screw 2) to increase or decrease
the air output so as to adjust it to the corresponding gas output.
After output adjustment (maximum, minimum and
intermediate), it is important to lock all the air
adjustment screws 2) by the locking screws 3) so
as to avoid possible movements from the position
CAUTION
of air - gas calibration.
1
Key (Fig. 37)
1
Cam
2
Adjustment screws
3
Locking screws
4
Adjustable profile
Key (Fig. 38)
1
Maximum oil pressure switch
2
Return pressure gauge
3
Variable eccentric
4
Eccentric adjustment screw
5
Piston stop ring
6
Piston calibration nut and lock nut
7
Eccentric locking screws
8
Adjustment screw/calibration for maximum oil pressure
switch
32
GB
2
3
4
D1499
Fig. 37
D11337
Fig. 38
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