2623
7
GB
4.3
COMBUSTION HEAD SETTING,
(see fig. 12, page 6)
It depends on the output of the burner and is carried out by rotating clockwise or counterclockwise the setting
screw (6) until the set-point marked on the regulating rod (7) is level with the outside plane of the nozzle-holder
assembly (1).
➤
In the sketch the combustion head is set for an output of 4.00 GPH at 15 bar.
The set-point 2 of the regulating rod (7) is at the same level with the outside plane of the nozzle-holder
assembly (1) as shown in the schedule.
4.4
ELECTRODES ADJUSTMENTS,
(see fig. 13)
4.5
PUMP PRESSURE AND AIR OUTPUT
The burner, in order to guarantee good smooth
starts, irrespective of the type of boiler, is fitted
with a hydraulic device which, independently of
the control-box, reduces the fuel- and air-flow.
At ignition, the pressure at the nozzle is 9 bar.
After 3 - 9 seconds, it automatically increases to
15 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
(See fig. 14)
ADJUSTMENT OF AIR SHUTTER
Unloosen the screw (8), by approximately one full
turn; in this way, the burner remains permanently
on low flame.
Unloosen the nut (5), turn the screw (4) until the
indicator (6) reaches the position desired.
Then lock the nut (5) and tighten the screw (8).
ADJUSTMENT START DELAYING DEVICE
This is set at 9 bar at the factory.
The pressure gauge must be mounted in place of
plug (4, fig. 7, page 4). Should it be necessary to
re-set or alter such pressure, this can be done,
by adjusting screw (7), always after having loos-
ened screw (8). For the adjustment, follow what
indicated in the table at page 6.
Anyway, it is advised to adjust the content of CO
2
at values not lower than 12%.
MEASURES MUST BE RESPECTED.
WARNING:
Lean the diffuser disc-holder assembly (1)
on the nozzle-holder (2) and lock it by
screw (3). For prospective adjustments
loosen screw (4) and move the electrodes
assembly (5).
To have access to the electrodes carry
out operation as described in chapter “4.2
RECOMMENDED NOZZLES” (page 6).
D4019
4.5
– 0.5 mm
0
6 – 7
mm
Fig. 13
1
3
2
5
4
S7161
Fig. 14
