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5.5.1
Adjusting gas/air delivery
Move slowly towards the maximum output (butterfly gas valve
completely open);
adjust the required maximum output with the gas pressure sta-
bilizer;
adjust the combustion parameters with the air servomotor and
store the maximum combustion point;
complete the procedure slowly, synchronizing the combustion
with the two servomotors and storing the different setting
points.
For the start-up procedure and the parame-
ters calibration, refer to the specific instruc-
tion manual of the LMV37... electronic cam
supplied with the burner.
WARNING
5.6
Final calibration of the pressure switches
5.6.1
Air pressure switch
The air pressure switch is connected in differential (Fig. 42) and is
activated by both the negative pressure of the air intake and the air
pressure from the fan.
Adjust the air pressure switch (Fig. 41) after having performed all
other burner adjustments with the air pressure switch set to the
min. of the scale.
With the burner operating at low fire, adjust the pressure switch by
slowly turning the relative knob clockwise until the burner locks out.
Then turn the knob counter-clockwise about 20% of the set point
and start-up the burner again to ensure the set point is correct.
If the burner locks out again, turn the knob counter-clockwise a little
bit more.
Start-up, calibration and operation of the burner
33
5.5.2
Adjusting oil/air delivery
Switch to the light oil operation.
During the ignition, move slowly with an approximate adjust-
ment to the oil servomotor at maximum 90°.
Adjust the maximum pressure on the return nozzle throught
the "nut and lock-nut" 5)(Fig. 15).
Adjust the combustion parameter with the air servomotor and
store the maximum combustion point.
Complete the procedure slowly, synchronizing the combustion
with the two servomotors.
Store the different setting points.
20048352
GB
D3854
Fig. 41
Fig. 42
20043127
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