Combustion Head Setting; Air Damper Adjustment - Riello 40 G3RD MC Installation, Use And Maintenance Instructions

8.2.2

Combustion head setting

This is done when fitting the nozzle, with the blast tube removed.
It depends on the output of the burner and is carried out by rotat-
ing the regulating rod, till the terminal plane of the blast tube is
level with the set-point, as indicated in the schedule.
For this application, the head should be fully open (at notch 6).
Terminal plane of the blast tube
Blast tube
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 sub-
sequently 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 CO2 and the adhesion of the flame to the air diffuser disc im-
proves.
(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 CO2 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.
1
20163551
Start-up, calibration and operation of the burner
2
D5582
5 3 1
Regulating rod
Shutter
2
6
8.2.3

Air damper adjustment

The settings indicated in the schedule refer to the burner with its
metal cover fitted and the combustion chamber with "zero" de-
pression. These regulations are purely indicative. Each installa-
tion however, has its own unpredictable working conditions:
actual nozzle output; positive or negative pressure in the com-
bustion-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.
WARNING
Therefore we recommended to proceed as follows:
 adjust the air damper as indicated in the See Tab. E
page 17;
 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.
Fig. 16
3
D5587
Fig. 17
18 GB