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The setting of the fan output according to the installation
should be done only through the air damper. Should you want
to adjust the setting of the combustion head, with the
burner running, turn the rod (1) with a 6mm wrench (2) as
follows:
TURN TO THE RIGHT: (SIGN + )
In order to increase the volume of air entering the
combustion chamber and thus diminishing its pressure.
There is a reduction of CO
2
and the adhesion of Figure 21
the flame to the air diffuser disc improves.
(Setting advisable for ignitions at low temperatures).
TURN TO THE LEFT: (SIGN - ) Figure 21
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 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 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 schedule (3);
• 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.
The burner is provided with a hydraulic device controlled by the economizer which reduces the max. output of oil
and air by approximately 70%.