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5.7
Final calibration of the pressure switches
5.7.1
Air pressure switch
Adjust the air pressure switch (Fig. 48) after having performed all
other burner adjustments with the air pressure switch set to the
start of the scale.
With the burner operating at min. output, increase adjustment pres-
sure by slowly turning the relative dial clockwise until the burner
locks out.
Then turn the dial anti-clockwise by about 20% of the set point and
repeat burner starting to ensure it is correct.
If the burner locks out again, turn the dial anti-clockwise a little bit
more.
As a rule, the air pressure switch must prevent the
formation of CO. To check this, insert a combustion
analyser into the chimney, slowly close the fan suc-
tion inlet (for example with cardboard) and check
WARNING
that the burner locks out, before the CO in the
fumes exceeds 400 ppm.
To check this, insert a combustion analyser into the chimney,
slowly close the fan suction inlet (for example with cardboard)
and check that the burner locks out, before the CO in the fumes
exceeds 1%.
On RLS 300-400-500/EV FGR burners the air pressure switch
is fitted in a "differential" mode, that is, with two pipes connected
to the specific pressure test points "+" and "-" 22) and 37)(Fig. 3
at page 11).
5.7.2
Maximum gas pressure switch
Adjust the maximum gas pressure switch (Fig. 49) after having per-
formed all other burner adjustments with the maximum gas pres-
sure switch set to the end of the scale.
With the burner operating at MAX output, reduce the adjustment
pressure by slowly turning the adjustment dial anticlockwise until
the burner locks out.
Then turn the dial clockwise by 0.8" WC and repeat burner firing.
If the burner locks out again, turn the dial again clockwise by
0.4" WC.
5.7.3
Minimum gas pressure switch
Adjust the minimum gas pressure switch (Fig. 50) after having per-
formed all the other burner adjustments with the pressure switch
set at the start of the scale.
With the burner operating at MAX output, increase adjustment
pressure by slowly turning the relative dial clockwise until the burn-
er locks out.
Then turn the dial anti-clockwise by 0.8" WC and repeat burner
starting to ensure it is uniform.
If the burner locks out again, turn the dial anti-clockwise again by
0.4" WC.
20037168
Start-up, calibration and operation of the burner
44
GB
D3854
Fig. 48
D9272
Fig. 49
D9290
Fig. 50
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