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4.3 COMBUSTION HEAD SETTING
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 3.50 GPH at 12 bar.
➤
The set-point 2.5 of the regulating rod (7) is at the same level with the outside plane of the nozzle-holder as-
sembly (1) as shown in the schedule.
4.4 ELECTRODES ADJUSTMENTS
ATTENTION
L e a n t h e d i f f u s e r d i s c - h o l d e r
assembly (1) on the nozzle-holder
(2) and lock it by screw (3). For
prospective adjustments loosen
s c r e w ( 4 ) a n d m o v e t h e e l e c -
trodes assembly (5).
To have access to the electrodes
carry out operation as described in
ch ap te r 4. 2 (page 6) "R EC O M-
MENDED NOZZLES".
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
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
(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 in-
dicator (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. 8, page 4).
Should it be necessary to re-set or alter such pres-
sure, this can be done, by adjusting screw (7), al-
ways after having loosened screw (8).
2960
(see fig. 12, page 6)
(see fig. 13)
WARNING
4.5
Fig. 13
Fig. 14
S7161
7
GB
MEASURES MUST BE
RESPECTED
0
6
– 0.5 mm
4
5
3
2
1
–
7
mm
D5085
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