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6.3
Burner start-up
Feed electricity to the burner via the disconnecting switch on the
boiler panel.
Close the remote controls and turn:
–
switch 1)(Fig. 27) to the "Burner ON" position;
–
switch 2)(Fig. 27) to the "1st stage" position.
As soon as the burner starts up:
–
check the fan rotation direction through the
flame inspection window 13)(Fig. 5, page 11).
WARNING
–
check the fan motor rotation direction, as
shown in Fig. 28.
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.
DANGER
If voltage is present, stop the burner immediately
and check the electrical wiring.
6.4
Burner ignition
Having completed the checks indicated in the previous heading,
ignition of the burner should be achieved.
If the motor starts but the flame does not appear and the control
box goes into lockout, reset and wait for a new start-up 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.
6.5
Servomotor adjustment
The servomotor (Fig. 29) simultaneously adjusts the air damper
(by means of the variable profile cam) and the gas butterfly valve.
The servomotor rotates by 130° in 15 seconds.
Do not alter the factory setting for the 5 cams;.
check only that they are as shown below.
WARNING
Cam I:
130°
Limits rotation toward maximum position.
When the burner is at MAX output, the gas butterfly
valve must be fully open: 90°.
Cam II:
0°
Limits rotation toward minimum position.
When the burner is shut down, the air damper and
gas butterfly valve must be closed: 0°.
Cam III:
15°
Adjusts the firing and output position in 1st stage.
Cam V:
Not used.
Start-up, calibration and operation of the burner
Burner OFF
Burner ON
20052581
The arrival of gas to the pipe coupling is shown by the pressure
gauge.
Once the burner has fired, now proceed with global calibration
operations.
25
GB
1
2
1st stage
2nd stage
D469
D3859
Fig. 27
Fig. 28
Fig. 29
20054100
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