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6.10
Burner adjustment and output modulation
6.10.1 Maximum output
The servomotor (Fig. 33 on 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 shown on
pag. 10.
Turn the selector 4)(Fig. 31) "output reduction", and keep it
turned to "-" 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. 35) must be progressively ad-
justed by turning the screws 2)(Fig. 35).
It is preferable not to turn the first screw since this
is used to set the air damper to its fully closed po-
sition.
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 posi-
tions of the servomotor.
The passage from one position to the next one is obtained by
pressing the selector 4)(Fig. 31) on the symbol "+" or "-".
6.11
Air / fuel adjustment
The following adjustments must be performed during the calibra-
tion of the air/fuel ratio:
A
Oil pump outlet pressure:
turn screw 5)(Fig. 20 on pag. 22), on the pump.
B
Air cam:
turn the adjustment screws 2)(Fig. 35) after having loosened
screws 3).
C
Gas cam:
turn the adjustment screws 2)(Fig. 35) after having loosened
screws 3).
D
Oil cam:
modify the eccentricity by turning the screw 7)(Fig. 36) after
having loosened screws 6).
By tightening the screw 7) the eccentricity increases,
thereby increasing the difference between the maximum
and minimum return pressure of the nozzle.
20040160
Start-up, calibration and operation of the burner
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. 35) is aligned with one of the adjustment screws 2).
Screw or unscrew the preset 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 ad-
justment screws 2) by the locking screws 3) so as
CAUTION
to avoid possible movements from the position of
air - gas calibration.
1
Key (Fig. 35)
1
Cam
2
Adjustment screws
3
Locking screws
4
Adjustable profile
3
7
4
Key (Fig. 36)
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
D1499
1
D11337
6
5
3
4
Fig. 35
8
2
Fig. 36
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