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7.4
Air shutters adjustments
The adjustment of the air shutters shall be set each time, with ref-
erence to the nozzles deliveries and the combustion chamber
pressurization.
Fig. 17 shows the positioning of the air shutters.
Fig. 18 shows the positioning of the cams of the motor.
st
1
Stage adjustment:
it must carry out manually.
nd
rd
2
- 3
Stage adjustment:
its must carry out by the motor cams with a little screwdriver. The
motor follows each moving of the cams automatically.
Cams command air shutters adjustments
adjustment not necessary. Positioned by the
Cam 0:
factory on the close shutters.
nd
for 2
stage air shutters adjustment. All
Cam ST2:
group A) moves by acting on cam ST2,
(Fig. 18).
rd
for 3
stage air shutters adjustment.
Cam ST3:
All group B) moves by acting on cam ST3,
(Fig. 18).
Regolazioni camme comando valvole
st
1
valve:
controlled by the control box.
controlled by the cam MV2.
nd
2
valve:
Act on the cam MV2 to open the valve before
the shutter reach the 2nd stage position.
rd
3
valve:
controlled by the fixed cam next the cam ST3.
NOTE:
Never adjust the cams with sealed screws.
20184179
Start-up, calibration and operation of the burner
Air shutter position 2
nd
rd
2
and 3
Sector A 1
22
GB
D2774
nd
rd
and 3
stage
stage air shutter motor
st
stage air shutter
Fig. 17
D2810
Fig. 18
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