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5.4
Combustion air adjustment
Fuel/combustion air must be synchronized with the relevant servo-
motors (air and gas) by storing a setting curve by means of the
electronic cam.
To reduce pressure loss and to have a wider adjustment range, it
is best to set the servomotor to the maximum output used, as near
to maximum opening (90°) as possible.
On the gas butterfly valve, the fuel's partial setting adjustment
based on required output, with the servomotor fully open, is made
by using the pressure stabilizer on the gas train.
With O
control via the relative kit, follow the instructions about
2
commissioning in the specific handbook for the LMV36.5... instru-
ment provided at the Technical Service Training.
5.4.1
Adjusting gas/air delivery
Move slowly towards the maximum output (butterfly gas valve
completely open);
adjust the required maximum output with the gas pressure sta-
bilizer;
adjust the combustion parameters with the air servomotor and
store the maximum combustion point;
complete the procedure slowly, synchronizing the combustion
with the two servomotors and storing the different setting
points.
5.4.2
Air/fuel control and power modulation system
The air/fuel and power modulation system installed on RS burner
series provides, a set of integrated functions ensuring top level en-
ergy and operational performance from the burner, both for single
and grouped burners (e.g. boiler with a double combustion cham-
ber or several generators in parallel).
5.5
Final calibration of the pressure switches
5.5.1
Air pressure switch
The air pressure switch is connected in differential (see Fig. 33)
and is activated by both the negative pressure of the air intake and
the air pressure from the fan.
Adjust the air pressure switch after having performed all other burn-
er 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.
20069791
Start-up, calibration and operation of the burner
28
The system includes the following basic functions:
air and fuels are supplied in correct quantities by positioning
the valves by direct servo-control, thus avoiding the possibility
of play typical of systems used for traditional modulating burn-
ers, in which settings are obtained by levers and a mechanical
cam;
burner power is modulated according to the load required by
the system, while boiler pressure or temperature is maintained
at set operating values;
fine, continuous correction of the airflow according to the anal-
ysis of the flue gases at the stack (O
ated with the O
kit containing the PLL module and the QGO2
2
sensor;
measurement of the combustion efficiency; this function is
associated with the O
a sequence (cascade control) of several boilers by suitably
connecting different units.
Further interfaces and computer communication functions for re-
mote control or integration in centrally supervised systems are
available according to the system's configuration.
NOTE
The first start-up and all further operations concerning internal set-
tings of the control system or expansion of basic functions, are ac-
cessed with a password and are reserved for technical service
personnel specifically trained for internal programming of the in-
strument and for the specific application obtained with this burner.
The first start-up and curve synchronization manual is supplied with
the burner.
The complete manual for checking and setting all parameters will
be provided on application.
GB
); this function is associ-
2
kit;
2
20048352
Fig. 33
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