2684
8
GB
TURN TO THE RIGHT: (sign +)
In order to increase the volume of air entering the combus-
tion 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 advisable for ignitions at low temperatures).
TURN TO THE LEFT: (sign –)
In order to reduce the volume of air entering the combus-
tion 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 com-
bustion 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.
4.6 AIR DAMPER ADJUSTMENT,
(see fig. 14)
The mobile air damper (1) operated by the jack (2) assures
the complete opening of the air intake.
The regulation of the air-rate is made by adjusting the fixed
air damper (3), after loosing the screws (4). When the opti-
mal regulation is reached, screw tight the screws (4) to
assure a free movement of the mobile air damper (1).
The settings, indicated in the table at page 6, refer to the
burner with its cover fitted and combustion chamber with
depression zero.
These regulations are purely indicative. Each installation
however, has its own unpredictable working conditions:
actual nozzle output; positive or negative pressure in the
combustion-chamber, the need of excess air, etc.
All these conditions may require a different air-damper
setting.
It is important to take account of the fact that the air
output of the fan differs according to whether the
burner has its cover fitted or not.
Therefore we recommended to proceed as follows:
➤
Adjust the air damper as indicated in the table at
page 6.
➤
Mount the cover.
➤
Check smoke number and CO
2
.
➤
Should it become necessary to modify the air output,
remove the cover by loosening the screw, adjust the
air damper, remount the cover and finally recheck the
smoke number.
4.7 PUMP PRESSURE
12 bar: The pump leaves the factory set at this value.
14 bar: Improves flame retention; it is therefore suitable
for ignitions at low temperatures.
Blast tube
Shutter
Terminal plane of the blast tube
D5398
2
1
3
5
Regulating rod
Fig. 12
1
2
3
6
D5967
Fig. 13
4
3
D5555
4
1
2
Fig. 14
