7 20013743
Combustion head settings indicated in the table are valid
for most cases. The setting of the fan output according to
the installation should normally be done only through the
air damper. Should one subsequently want to retouch
also the setting of the combustion head (fig. 6), with the
burner running, operate on the rod (1) with a 6 mm span-
ner (2) as follows:
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 CO2and 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 CO2
improves and the adhesion of the flame to the diffuser
tends to reduce. (This setting is not advisable for igni-
tions 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.
AIR DAMPER ADJUSTMENT, (fig. 7)
The mobile air damper (A) operated by the jack (B) as-
sures the complete opening of the air intake.
The regulation of the air-rate is made by adjusting the
fixed air damper (C), after loosing the screws (D).
When the optimal regulation is reached, screw tight the screws (D) to assure a free movement of
the mobile air damper (A).
The settings indicated in the table refer to the burner with its metal cover fitted and the combustion
chamber with “zero” depression.
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 metal cover fitted or not.
Therefore we recommended to proceed as follows:
– adjust the air damper as indicated in the table;
– mount the cover, simply by means of the upper screw;
– check smoke number;
– 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.
1
23
6
D5551
D
C
D5555
D
AB
Fig. 6
Fig. 7
