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6.4
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
flame control goes into lockout, reset it and wait for a new ignition
attempt.
Two types of burner failure may occur:
flame control lockout: if the flame control push-button (red
led) 2)(Fig. 5 on page 12) lights up, it indicates that the
burner is in lockout. Refer to the flame control diagnostics for
the causes of the lockout. release by pressing the push-but-
ton 2)(Fig. 5 on page 12). See flame control reset.
6.5
Servomotor adjustment
The servomotor (Fig. 23) provides simultaneous adjustment for
the air damper, by means of the adjustable profile cam and the
gas butterfly valve. Completes a rotation of 90° in 30 s.
After the adjustment made in the factory to its 6 cams to allow an
initial ignition. Check that they are as shown below. In the event
of a modification, follow what is described below for each cam:
Cam I
(RED):
90°
Limits the rotation towards the maximum.
In the event of a variation, absolutely do not adjust
beyond 90°.
WARNING
Cam II
(BLUE): 0° (The same for all models)
Limits the rotation towards the minimum.
With the burner off the air damper
and the gas butterfly valve should be closed: 0°
It
is
recommended
are made.
Cam III
(ORANGE): 10°
Adjusts the ignition position and MIN. output
Cam IV-V-VI
(YELLOW/BLACK/GREEN):
Do not use, they have no effect on the opera-
tion of the burner.
6.6
Air / fuel adjustment
The air/fuel synchronisation is carried out using a servomotor
1)(Fig. 24) 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 18).
Start-up, calibration and operation of the burner
(The
same
for
all
models)
that
no
adjustments
Motor lockout because of thermal relay intervention:
because of an erroneous calibration of the thermal relay or
problems with the motor or the main power supply. Release
by pressing the button on thermal relay, see section "Cali-
bration of the thermal relay" on page 14.
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. 21).
Once the burner has fired, now proceed with global calibration
operations.
20074577
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.
2
23
GB
20162252
1
Fig. 23
Fig. 24
20160598
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