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5.4
Burner ignition
Once the above steps are complete, the burner should light.
If the motor starts up, but the flame does not appear and the control
box goes into lockout, reset it and wait for a new ignition attempt.
If ignition is still not achieved, it may be that gas is not reaching the
combustion head within the safety time period of 3 seconds. In this
case increase gas ignition delivery.
The arrival of gas at the pipe coupling is indicated by the U-type
pressure gauge (Fig. 24).
If further burner lockouts occur, refer to the "Release procedure"
given in the equipment manual supplied.
Once the burner has ignited, proceed with the global adjustment of
the burner.
5.4.1
Air / gas adjustment and output modulation
The air/gas regulator and output modulation system equipping RS
series burners performs a number of integrated functions to opti-
mise burner function, in both individual installations and in combi-
nation with other units (e.g. double furnace boiler or multiple heat
generators in parallel).
The basic system functions control:
1
The dosage of the air and fuel through positioning using direct
servocommands of the relevant valves eliminating the possi-
ble play in the calibration systems with mechanical cam lever
mechanisms, used on traditional modulating burners.
5.5
Final calibration of the pressure switches
5.5.1
Air pressure switch
Adjust the air pressure switch after having performed all other bur-
ner adjustments with the air pressure switch set to the start of the
scale (Fig. 25).
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
air pressure from lowering below 80% of the adjust-
ment value as well as preventing the CO in the fu-
mes from exceeding 1% (10,000 ppm).
WARNING
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%.
The air pressure switch is fitted in an "absolute" mode, that is,
connected only to the pressure test point "+" 23)(Fig. 5).
Start-up, calibration and operation of the burner
23
2
The modulation of the burner output in accordance with the
load required by the system, with maintenance of the pres-
sure or temperature of the boiler at the operating values set.
3
The sequence (cascade adjustment) of more than one boiler
through the suitable connection of the various units and the
activation of the internal software of the individual systems
(option).
Further interfaces and communication functions with computers,
for remote control or integration in central supervision systems are
available on the basis of the configuration of the system.
The first start up and every further internal setting
operation of the adjustment system or the expan-
sion of the base functions require access by means
WARNING
of password and are to be carried out by service
personnel who are especially trained for the internal
programming of the instrument and the specific ap-
plication created with this burner.
The first start-up and curve synchronisation manual is supplied with
the burner.
At request, the complete manual for the control and setting of all
parameters is available.
GB
D3854
Fig. 25
20060897
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