20102152
30
GB
Start-up, calibration and operation of the burner
5.4
Adjusting gas/air delivery
Complete the procedure slowly, synchronizing the combustion with
the two servomotors and storing the different setting points.
5.5
Final calibration of the pressure switches
5.5.1
Air pressure switch
The air pressure switch is connected in differential (Fig. 37) 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. 36) 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.
DANGER
As the burner is not fitted with a device to check the
sequence of the phases, the motor rotation may be
incorrect.
As soon as the burner starts up, go in front of the
cooling fan of the fan motor and check it is rotating
anticlockwise. See Fig. 35.
If this is not the case:
place the switch of Fig. 35 in position
“0”
and
wait for the control box to carry out the switch-
off phase;
disconnect the electrical supply from the
burner;
invert the phases on the inverter output.
WARNING
For further information, please refer to the specific
instruction of the control box.
WARNING
For the start-up procedure and the parameters
calibration, refer to the specific instruction man-
ual of the LMV37... electronic cam supplied with
the burner.
DANGER
– Move slowly towards the maximum output (but-
terfly gas valve completely open);
– adjust the required maximum output with the gas
pressure stabilizer;
– adjust the combustion parameters with the air
servomotor and store the maximum combustion
point.
Fig. 36
D3854
Fig. 37
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