27
20061862
GB
Start-up, calibration and operation of the burner
6.8.1
Burner calibration procedure
After making a first ignition, verify the correct operation at the de-
sired output. If this is not so, calibrate the gas cam.
With the optimal adjustment obtained, remember to lock the ad-
justment screws of the cam profiles by means of screws
3)(Fig. 29).
6.9
Pressure switch adjustment
6.9.1
Air pressure switch - check CO
Adjust the air pressure switch after performing all other burner
adjustments with the air pressure switch set to the start of the
scale (Fig. 31).
With the burner operating at MIN output, increase adjustment
pressure by slowly turning the relative knob clockwise until the
burner locks out.
Then turn the knob anticlockwise by about 20% of the set point
and repeat burner start-up to ensure it is correct.
If the burner locks out again, turn the knob anticlockwise a little
bit more.
The air pressure switch is installed in “absolute” position, that is
connected only to the pressure test point “+” 22)(Fig. 4).
6.9.2
Maximum gas pressure switch
Adjust the maximum gas pressure switch after performing all oth-
er burner adjustments with the maximum gas pressure switch set
to the end of the scale (Fig. 32).
With the burner operating at maximum output, lower the adjust-
ment pressure by slowly turning the relative knob anticlockwise
until the burner locks out.
Now 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.
6.9.3
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. 33).
With the burner operating at maximum output, increase adjust-
ment pressure by slowly turning the relative knob clockwise until
the burner stops.
Now turn the knob anticlockwise by 2 mbar and repeat burner
start-up to ensure it is uniform.
If the burner locks out again, turn the knob anticlockwise again by
1 mbar.
WARNING
During the calibration of the cam, do not exceed
the travel limits of the servomotor 0 ÷ 130 to avoid
sticking.
Check, again with a manual operation 0-130 of the
cam, there are no mechanical stops before the acti-
vation of the micro-switches 1-2 of the servomotor.
WARNING
In conformity with the standard, the air pressure
switch must prevent the air pressure falling below
80% of the adjusted value and the CO in the flue
gases exceeding 1% (10,000 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 burn-
er locks out, before the CO in the fumes exceeds
1%.
Fig. 31
D3854
Fig. 32
D3856
Fig. 33
D3855
Summary of Contents for RS 1000/M C01
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