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6.4
Burner start-up (light oil)
Feed electricity to the burner via the disconnecting switch on the
boiler panel.
Close the thermostats/pressure switches and turn the switch in
Fig. 36 to position "MAN".
As soon as burner starts, check the fan rotation direction
through the flame inspection window.
Check that the lamps or testers connected to the
solenoid valves, or the pilot lights on the solenoid
valves, indicate that no voltage is present. If they
DANGER
indicate the presence of voltage, stop the burner
immediately and check the electric connections.
6.5
Burner ignition (light oil)
Turn switch 1)(Fig. 36) to "MAN" position.
During the first firing, during the passage from the 1st to the 2nd
stage, there is a momentary lowering of the fuel pressure caused
by the filling of the 2nd stage nozzle.
This lowering of the fuel pressure can cause the burner to lockout
and can sometimes give rise to pulsations.
Once the following adjustments have been made, the firing of the
burner must generate a noise similar to the noise generated
during operation.
6.6
Burner adjustment (light oil)
It is recommended to adjust first the light oil burner and then the
gas burner.
Carry out the fuel change with burner off.
ATTENTION
6.6.1
Ignition
Put the switch 1)(Fig. 27) on "MAN".
During the first firing, during the passage from the 1st to the 2nd
stage, there is a momentary lowering of the fuel pressure caused
by the filling of the 2nd nozzle tubing. This lowering of the fuel
pressure can cause the burner to lockout and can sometimes
give rise to pulsations. When first ignited, the burner should make
a noise to show it is operating.
6.6.2
Operation
The optimum calibration of the burner requires an analysis of the
flue gases at the boiler outlet and interventions on the following
points.
•
1st and 2nd stage nozzles
See information on page 21.
•
Combustion head
The adjustment of the head that has already been carried out
as on page 23 does not require any modifications unless the
burner output in the 2nd stage is changed.
•
Pump pressure:
In order to change pump pressure, act on screw 5) (Fig. 26).
See information on page 26.
•
1st and 2nd stage fan damper
See servomotor adjustment on page 31.
20148266
Start-up, calibration and operation of the burner
32
GB
1
2
D791
Fig. 36
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