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6.4
Burner start-up
Turn off the thermostats/pressure switches and check the light
signal 2) comes on (Fig. 6 on page 14).
Put the selector 1)(Fig. 29) in position " MAN ".
Start of the fan motor. As the burner is not fitted with a device to
check the sequence of the phases, the motor rotation may be in-
correct.
As soon as the burner starts up, go in front of fan motor cooling
fan and check it is rotating anticlockwise or else in the direction
of the arrow shown in the diagram (burner description).
If this is not the case:
➤ put the switch 1) of Fig. 29 to "OFF" and wait for the control
box carries out the switching off phase;
disconnect the burner's electrical supply, since
this operation should be carried out in the ab-
sence of the electrical supply;
DANGER
➤ Invert the phases on the three-phase power supply;
➤ repeat the start-up procedure.
6.5
Burner ignition
The burner should light after having performed the above steps.
If the motor starts up, but the flame does not appear and the con-
trol box goes into lockout, reset it and wait for a new ignition at-
tempt.
Two types of burner failure may occur:
➤ Control box lockout : if the control box push-button (red led)
2)(Fig. 6 on page 14) lights up, it indicates that the burner is
in lockout. Refer to the control box diagnostics for the
causes of the lockout. release by pressing the push-button
2)(Fig. 6 on page 14). See control box reset.
➤ Motor lockout because of thermal relay intervention :
because of an erroneous calibration of the thermal relay or
6.6
Air / fuel adjustment
The air/fuel synchronisation is carried out using a servomotor
1)(Fig. 30) which, when connected directly to the air dampers,
acts on the gas butterfly valve by means of an adjustable profile
cam 2) and suitable leverage.
WARNING!
MOVING PARTS
DANGER: CRUSHING OF LIMBS
It is advisable, to reduce the loss and for a wide calibration field,
to adjust the servomotor to the maximum of the output used, the
nearest possible to the maximum opening (90°).
The choking of the air, taking into account the maximum combus-
tion output, takes place by varying the adjustment of the combus-
tion head (see "Combustion head adjustment" on page 22.).
On the gas butterfly valve, fuel step according to the burner out-
put required, with servomotor completely open, is carried out by
the pressure stabiliser placed on the train.
20075006
Start-up, calibration and operation of the burner
Make sure that the lights or testers connected to
the solenoids, or the pilot lights on the solenoids
themselves, indicate that no voltage is present.
If voltage is present, stop the burner immediately
WARNING
and check the electrical wiring.
20073937
problems with the motor or the main power supply. Release
by pressing the button on thermal relay, see section 4.15 on
page 17.
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. 27).
Once the burner has fired, now proceed with global calibration
operations.
20071254
28
GB
Fig. 29
Fig. 30
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