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7.8
Servomotor adjustment
The servomotor adjusts simultaneously, through driving gears,
the output and pressure of the air and the delivery of the fuel in
use. It performs a 135° rotation in 45s. After the adjustment made
in the factory to its 6 cams to allow an initial ignition.
Check that they are as shown below.
In the event of a modification, follow what is described below for
each cam:
Cam I (RED):
Do not make any adjustments.
ATTENTION
Cam II (BLUE):
It is recommended that no adjustments are made.
ATTENTION
Cam III:
Not used.
Cam IV:
Not used.
Cam V (BLACK):
Cam VI (GREEN):
7.9
Pressure switch adjustment
7.9.1
Oil pressure switch
It triggers the lockout condition of the burner in case of too much
counter-pressure on the fuel return line.
Recommended calibration (recommended values with return line
resistance in tank of 0.5 bar): 3.0 ÷ 3.5 bar.
In case of control box lockout (in position "P") calibrate the
pressure switch again with incremental values of 0.5 bar.
To adjust the pressure switches, use a tool to operate the
adjustment screw, see Fig. 38.
20170392
Start-up, calibration and operation of the burner
135° (The same for all models).
Limits
rotation
maximum position.
0°
(The same for all models).
Limits
rotation
minimum position. With the
burner off, the air damper is
completely closed: 0°
20° (The same for all models).
Adjusts the ignition position and
the minimum output.
130° (The same for all models).
Adjusts the position of the
maximum output.
toward
20074577
toward
32
GB
Fig. 37
20079898
Fig. 38
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