20013748
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 vol-
ume of air entering the combustion 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 combustion chamber and thus increas-
ing 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 regulation of the air-rate is made by adjusting the
air damper
(1)
, after loosing the screws
(2)
.
When the optimal regulation is reached,
screw tight
the screws (2).
The settings indicated in the schedule are purely indic-
ative.
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 (page 5);
– 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
1
2
D5231
4
