Combustion Head Adjustment; Position Of Electrodes - Riello DB 4 LSM C13 Installation, Use And Maintenance Instructions

4.11

Combustion head adjustment

Pay attention to moving parts.
Danger of crushing of limbs!
The air damper servomotor 4)(Fig. 8 on page 12), beyond vary-
ing the air output according to the output demand, through a lev-
erage varies the combustion head adjustment.
This system allows an optimum adjustment also at minimum fir-
ing rate.
Similarly to servomotor rotation, it is possible to vary the opening
of the combustion head moving the tie-rod on the holes (1-2-3),
(Fig. 20).
The selection of the hole 1-2-3)(Fig. 21) to be used is determined
according to the maximum output requested (Tab. I).
In the factory, the hole is adjusted for the maximum stroke
(hole 3).
In case in which, with boilers with high back pressure, also with
damper completely open, the air output is not enough, it is possi-
ble to carry out a calibration different to the one indicated by the
Tab. I, moving the tie-rod on the following higher hole, increasing
the opening of the combustion head and the air output.
1
2
3
In order to work correctly in flame inversion boil-
ers, the gas tubes must be adjusted in the hole in
position 4, see Fig. 22.
WARNING
4.12

Position of electrodes

Make sure that the electrodes are positioned as
shown in (Fig. 23).
WARNING
Installation
Output (kW)
20118583
D8419
D3418
4 - 4 , 5 mm
19 GB
1200
2200
2800
3200
1800
3400
4000
4500
2 1
No. hole
1
2
3
3
1
2
3
3
Tab. I
Fig. 20
Fig. 21
Fig. 22
D3510
Fig. 23
20146011