2899
8
GB
TURN TO THE RIGHT: (sign +)
In order to increase the volume of air entering the
combustion chamber and thus diminishing its pres-
sure. There is a reduction of CO2 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 com-
bustion 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 advis-
able 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.
4.6
RECIRCULATING PIPE ADJUSTMENT,
(see fig. 17)
The burner leaves the factory with the recirculating
pipe in the Position 2.
If necessary, in order to optimise the combustion, place the flame tube according to the combustion head as
indicated in the table. It is important that the combustion chamber is enough large for the flue gases recirculation.
(Pay attention to the thickness of the boiler door).
By generally reducing the smoke recirculating section (RF), the combustion stability is increased, but emissions
of NOx are also increased.
4.7
PUMP PRESSURE
12 bar :The pump leaves the factory set at this value.
4.8
AIR DAMPER ADJUSTMENT,
(see fig. 18)
The mobile air damper (A) operated by the jack (B) assures 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 regula-
tion is reached, screw tight the screws (D) to assure a free move-
ment of the mobile air damper (A).
The settings, indicated in the table, refer to the burner with its cov-
er fitted and combustion chamber with depression zero. 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 cover
fitted or not. Therefore we recommended to proceed as follows:
➤
Adjust the air damper as indicated in the schedule of page 6.
➤
Mount the cover.
➤
Check smoke number and CO
2
.
➤
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.
E
Pos.
1
2
3
417T
178
196
213
418T
234
243
252
D4499
Position
RF
Fig. 17
3
2
1
E
D
C
D5555
D
A
B
Fig. 18
