Adjusting The Choke; Combustion Head Adjustment - Riello BG7.1D Installation, Use And Maintenance Instructions

5.7

Adjusting the choke

In certain applications, for example on boilers with three flue gas
passes or systems with particularly long flues, or flues with a wide
section, flame instability is possible due to the excessive recircu-
lation of flue gases through the recirculating pipe 1)(Fig. 11).
In these cases it is possible to adjust the choke 2)(Fig. 11) to re-
duce the section through which the flue gases pass, referring to
Tab. H page 22.
5.8

Combustion head adjustment

The adjustment of the combustion head varies depending on the
burner output.
Do the following to adjust it:
Turn the adjustment screw 2)(Fig. 12) clockwise or anti-clock-
wise until the notch on the regulating rod 3)(Fig. 12) lines up with
the outer surface of the nozzle-holder assembly 1)(Fig. 12).
Example:
the regulating rod 3)(Fig. 12) is calibrated to notch 2.5; this
means that the burner is adjusted for an output of 5.3kg/h with the
pump pressure at 9 bar and with the use of a 1.50 GPH nozzle,
as indicated in Tab. H page 22.
20137240
Installation
D9687
S7995
16 GB
1
2
mm
2
3
1
Fig. 11
Fig. 12