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7.2.3
Fan gate adjustment
1st stage:
The air gate valve 1) (Fig. 28) is set using the indexed selector 4)
(Fig. 28).
Loosen the screw 3) (Fig. 28) and the nut 2) (Fig. 28) and shift the
indexed selector 4) so that the index finger 7) (Fig. 28) corre-
sponds to the required notch setting indicated in (Tab. L) accord-
ing to the 1st stage nozzle's delivery.
Example
3.00 GPH nozzle.
The indexed selector must be set to notch 2.5.
2nd stage:
The air gate valve 1) (Fig. 28) must be set using the cylinder 6)
(Fig. 28). This setting must be adapted case by case to the burn-
er's delivery and combustion chamber pressure.
The first time the burner is fired, the hydraulic cylinder setting
should be left as originally set by the manufacturer: at approxi-
mately half of its full stroke.
In summary, the operations and settings that must be performed
prior to firing the burner for the first time are as follows:
– choice of the two nozzles;
– setting of the combustion head;
– setting of the fan's air gate valve for the 1st stage.
The following require no adjustment operations and may remain
as they are provided:
– pump pressure;
– setting of the fan's air gate valve for the 2nd stage.
7.3
Burner calibration
It is advisable to first set the burner for operating
on oil and then for gas.
Execute the fuel exchange when the burner is off.
WARNING
7.3.1
Firing
The firing of the burner must generate a noise similar to the noise
generated during operation. If one or more pulsations or a delay
in firing in respect to the opening of the gas oil solenoid valve oc-
cur, see the suggestions provided in page 35.
7.3.2
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 the information listed on page 22.
• Pump pressure
12 bar: this is the pressure calibrated in the factory which is usu-
ally sufficient for most purposes. Sometimes, this pressure must
be adjusted to :
10 bar in order to reduce fuel delivery. This adjustment is possi-
ble only if the surrounding temperature remains above 0°C. Nev-
er calibrate to pressures below 10 bar, at which pressures the
cylinder may have difficulty in opening;
14 bar in order to increase fuel delivery or to ensure firings even
at temperatures of less than 0°C.
In order to adjust pump pressure, use the relevant screw indicat-
ed in page 22.
20033097
Start-up, calibration and operation of the burner
D338
GPH
2,00
2,25
2,50
3,00
3,50
4,00
GPH
=
/ Nozzle 1st stage
N°
=
/ N° Notch
• 1st stage fan air gate valve
Sometimes it might be necessary to adjust the calibration per-
formed previously, especially in the case of two-stage operation
burners. Keep the burner operating in the 1st stage by opening
the control device TR or by removing the jumper on the terminal
block. Adjust the air gate valve 1) (Fig. 29) by using the indexed
selector 4) after having loosened the screw 3) and the nut 2).
D338
NOTE:
Burner starting and operation phases are indicated in
page 31.
28
GB
PRESS GBW
N°
1,5
1,5
2
2,5
3
3
Fig. 28
Tab. L
Fig. 29
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