Riello 40 G20D Instrucciones De Instalación, Uso Y Mantenimiento página 25

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 diminishing its
pressure.
There is a reduction of CO
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 pres-
sure. The CO improves and the adhesion of the flame to the dif-
2
fuser 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 facil-
itates 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 (see page 9);
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.
NOTE:
When the burner works at a firing rate higher than 18 kg/h
remove the panel fitted inside the metal cover. (See figure).
3397
and the adhesion of the flame to the
2
1
10 GB
2
6
D8068
PANEL
S7352
3