2406
7
GB
TURN TO THE RIGHT: (sign
+
)
In order to increase the volume of air entering the com-
bustion chamber and thus diminishing its pressure.
There is a reduction of CO
2
and the adhesion of the
flame to the air diffuser disc improves. (Setting advisa-
ble for ignitions at low temperatures).
TURN TO THE LEFT: (sign
–)
In order to reduce the volume of air entering the com-
bustion chamber and thus increasing its pressure.
The CO
2
improves and the adhesion of the flame to the
diffuser tends to reduce. (This setting is not advisable
for ignitions at low temperatures).
In any case do not bring the combustion head setting
more than one point away from that indicated in the
schedule. One set-point corresponds to 3 turns of the
rod; a hole (3) at its end facilitates counting the number
of turns.
PUMP-PRESSURE AND AIR-FLOW
(See fig. 4 and 5)
The burner, in order to guarantee good smooth starts,
irrespective of the type of boiler, is fitted with a hydrau-
lic device which, independently 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.
SETTING FOR THE LOW IGNITION-FLAME
Air-damper adjustment
Loosen the screw (1), by approximately one full turn; in
this way, the burner remains permanently on low flame.
Loosen the nut (2), 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). Should it be necessary to re-set or alter such
pressure, this can be done, by adjusting screw (5)
(always, after having loosened screw (1) ).
HIGH-FLAME SETTING
Air-damper adjustment
Loosen the nut (7), 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).
S7334
S7743
1
2
3
6
D8068
Fig. 3
Fig. 4
Fig. 5
