2347
6
GB
Combustion head settings indicated in the schedule 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, with the
burner running, operate on the rod (1) with a 6 mm spanner (2) as follows:
Turn to the right: (sign
+
), in order to increase the volume
of air entering the combustion chamber and thus diminish-
ing 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 combustion 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.
AIR DAMPER ADJUSTMENT
:
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 air damper leaves the factory set at position 3.
The settings indicated in the schedule 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 neg-
ative pressure in the combustion-chamber, the need of
excess air, etc. All these conditions may require a differ-
ent 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 schedule (4);
– 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
2
3
6
D5551
4
D
C
D5555
D
A
B
