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Start-up, calibration and operation of the burner
6.7 Servomotor adjustment
The servomotor provides simultaneous adjustment of the air
damper, by means of the variable profile cam and the gas
butterfly valve.
The angle of rotation of the servomotor is equal to the angle on the
graduated sector controlling the gas butterfly valve. The
servomotor rotates 90° in 12 s.
Do not alter the factory setting for the 4 cams; just check that they
are as specified below:
Cam St2 : 90°
Limits rotation toward maximum position. When the burner is
operating in 2nd stage, the gas butterfly valve must be fully open:
90°.
Cam St0 : 0°
Limits rotation toward minimum position. When the burner is shut
down, the air damper and gas butterfly valve must be closed: 0°
Cam St1 : 15°
Adjusts the ignition position and the output of the 1st stage.
Cam MV : not used
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