22
GB
Start-up, calibration and operation of the burner
5
Maximum gas pressure switch
Adjust the maximum gas pressure switch after having per-
formed all other burner adjustments with the maximum gas
pressure switch set to the end of the scale (Fig. 30).
With the burner operating at maximum output, reduce adjust-
ment pressure by slowly turning the relative knob anticlockwise
until the burner locks out.
Turn the knob clockwise by 2 mbar and repeat the start-up of
the burner.
If the burner locks out again, turn the knob clockwise again by
1 mbar.
Minimum gas pressure switch
Adjust the minimum gas pressure switch after having per-
formed all other burner adjustments with the pressure switch
set to the start of the scale (Fig. 31).
With the burner operating at maximum output, increase adjust-
ment pressure by slowly turning the relative knob clockwise
until the burner locks out.
Then turn the knob anticlockwise by 2 mbar and repeat the
burner start-up to ensure it is regular.
If the burner locks out again, turn the knob anticlockwise again
by 1 mbar.
Fig. 30
D3856
Fig. 31
D3855
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