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6.7.2
Maximum gas pressure switch
Adjust the maximum gas pressure switch after having performed
all the other burner adjustments with the maximum gas pressure
switch set at the end of the scale (Fig. 43).
With the burner operating at maximum output, lower the adjust-
ment pressure by slowly turning the relative knob anticlockwise
until the burner locks out.
Turn the knob clockwise by 0.2 kPa (2 mbar) and repeat the start-
up of the burner.
If the burner locks out again, turn the knob clockwise again by 0.1
kPa (1 mbar).
6.7.3
Minimum gas pressure switch
Adjust the minimum gas pressure switch after performing all the
other burner adjustments with the pressure switch set to the start
of the scale (Fig. 44).
With the burner operating at maximum output, increase adjust-
ment pressure by slowly turning the relative knob clockwise until
the burner stops.
Then turn the knob anticlockwise by 0.2 kPa (2 mbar) and repeat
burner start-up to ensure it is uniform.
If the burner locks out again, turn the knob anticlockwise again by
0.1 kPa (1 mbar).
1 kPa = 10 mbar
WARNING
WARNING
6.7.4
PVP pressure switch kit
Adjust the pressure switch for the leak detection control (PVP kit)
(Fig. 45) according to the instructions supplied with the kit.
6.7.5
Minimum oil pressure switch
The minimum oil pressure switch (Fig. 46) is calibrated in the fac-
tory at 18 bar. If the oil pressure falls below this value in the de-
livery line, the pressure switch stops the burner.
The burner restarts automatically if the pressure goes above 18
bar after the burner starts.
6.7.6
Maximum oil pressure switch
The maximum oil pressure switch (Fig. 46) is calibrated in the
factory at 3 bar. If the oil pressure goes above this value in the
return line, the pressure switch stops the burner.
The burner restarts automatically if the pressure drops below
3 bar, after the burner has stopped.
If a loop circuit with pressure "Px" feeds the burner, the pressure
switch has to be adjusted to Px + 3 bar.
For the regulation see Fig. 46.
20168262
Start-up, calibration and operation of the burner
34
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D3856
D3855
D3855
+
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+
20108033
Fig. 43
Fig. 44
Fig. 45
Fig. 46
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