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6.9
Servomotor
The servomotor (Fig. 37) simultaneously regulates, through a
transmission system, air delivery and pressure and delivery of the
fuel in use.
It is fitted with adjustable cams which drive a similar number of
selector switches.
Cam 1:
Sets the servomotor limit switch to max. posi-
tion (130° ca.).
(Oil operation).
Cam 2:
Sets the servomotor limit switch to 0° position.
When the burner is off, the air damper is com-
pletely closed.
(Oil and gas operation).
Cam 3:
Regulates minimum modulation delivery.
It is factory calibrated in the 45°. (Oil operation
at minimum).
Cam 4:
Sets the servomotor limit switch to max. posi-
tion (130° ca.).
(Gas operation).
Cam 5:
Regulates minimum modulation delivery.
It is factory calibrated in the 45°. (Gas opera-
tion).
Rem. cam:
No utilized.
Lever 7:
Servomotor release.
20010305
Start-up, calibration and operation of the burner
32
GB
D1384
Fig. 37
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