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8.6
Pump pressure and air flow
The burner, in order to guarantee good smooth starts, irrespec-
tive of the type of boiler, is fitted with a hydraulic device which, in-
dependently of the control box, reduces the fuel- and air-flow.
At ignition, the pressure at the nozzle is 9 bar.
After 4 - 6 seconds, it automatically increases to 12 bar.
The air flow, initially adjusted to the low setting, is, at the change-
over of pressure, automatically brought to the air-flow required for
the big flame.
8.6.1
Low ignition flame setting
Air damper adjustment
Loosen the screw 1)(Fig. 21), by approximately one full
turn; in this way, the burner remains permanently on low
flame.
Loosen the nut 2)(Fig. 22), turn the screw 3), in order to set
the air-damper 4) in the position required.
Then, lock the nut 2) and tighten the screw 1).
Reducer adjustment
The pressure reducer is factory set, at 9 bar.
The pressure gauge should be mounted, in place of plug
6)(Fig. 21). Should it be necessary to re-set or alter such pres-
sure, this can be done, by adjusting screw 5) (always, after hav-
ing loosened screw 1).
8.6.2
High flame setting
Air damper adjustment
Loosen the nut 7)(Fig. 22), turn the screw 8), until the air
damper 4) is in the required position.
Then, lock the nut 7).
Pump adjustment
The pump pressure is pre-set, during production, at 12 bar.
Should it become necessary to re-set or alter such pressure, this
can be done by turning screw 9)(Fig. 21).
8.7
Electrode setting
Before removing or assembling the nozzle, loosen the screw
A)(Fig. 23) and move the electrodes ahead.
Start-up, calibration and operation of the burner
S7334
4 ± 0.3 mm
D6313
21
GB
Fig. 21
S7336
Fig. 22
Move the electrode holder
backwards to the end
6.5 ± 0.5 mm
A
Fig. 23
2902383
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