Riello DB 3 LSM C13 Installation, Use And Maintenance Instructions page 45

5
Preparation for start up
5.1 Combustion head adjustment
In addition to varying air flow depending on the output requested, the air gate valve servomotor 7)(Fig. 2) by means of a lifting
assembly, varies the setting of the combustion head. This system allows an optimal setting even at a minimum firing rate.
For the same servomotor rotation, combustion head opening can be varied by moving the tie rod onto holes 1-2-3 (Fig. 15).
The choice of the hole (1-2-3) to be used is decided on the basis of diagram in Fig. 16 against the required maximum output.
Setting is pre-arranged in the plant for the maximum run (hole 3).
When dealing with boilers featuring a strong back pressure, if air delivery is insufficient even with the damper fully open, you can
use a different setting to that illustrated in diagram in Fig. 16, do this by moving the tie rod onto the next highest hole numerically
speaking, thus increasing the combustion head's opening and hence air delivery.
N° Hole
3
2
1
0
1600 2000
14
D8419
2400 2800 3200 3600 4000
Maximum burner output
Fig. 15
4400 4800 5200 5600
D7905
kW
6000 kW
Fig. 16