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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 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. 5 on page 12) 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. 5 on page 12). See control box reset.
6.5
Servomotor adjustment
The servomotor (Fig. 28) 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:
Camma I
(RED): 90°
(The same for all models). Limits the rotation to-
wards 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 to-
wards the minimum. With the burner off the air
damper and the gas butterfly valve should be
closed: 0°. It is recommended that no adjust-
ments 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 operation of the burner.
6.6
Air / fuel adjustment
The air/fuel synchronisation is carried out using a servomotor
1)(Fig. 29) 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 19).
20163413
Start-up, calibration and operation of the burner
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 15..
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. 26).
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
24
GB
20162252
1
Fig. 28
Fig. 29
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