6
x
Oil burner
43
FA ROTEX A1 BO - 10/2007
6.3.4 Set air quantity
The combustion air quantity is set using the adjusting screw for the air throttle (fig 6-5, pos. 1). The CO
2
content in the flue gas
must be regulated to
12.5–13.0 %
.
Tools required
: Flue gas analysis device to determine the CO
2
content of the flue gas.
• Connect up the flue gas analysis unit.
• To reduce air quantity: Turn air throttle adjusting screw to the left (lower scale value)
Î
O
2
È
, CO
2
Ç
• To increase air quantity: Turn air throttle adjusting screw to the right (higher scale value)
Î
O
2
Ç
, CO
2
È
6.3.5 Setting recirculation gap
The recirculation gap is set using the adjusting screw (fig 6-6, Pos. 1) which causes an axial shift in the mixer device in the
combustion tube (see fig 6-7).
The oil condensing boiler is generally designed to be operated independently of the ambient air and is equipped
with a concentric flue gas / supply air connection DN 80/125. If it is operated depending on the ambient air and
it is only connected to a single wall flue gas pipe, the settings can differ considerably from the values given in
tab. 6-1.
1
Adjusting screw for air throttle
2
Scale air throttle
Fig. 6-5
Setting the air throttle
You can make a rough pilot adjustment to the air quantity by using the values from tab. 6-1. But the rough
adjustment cannot replace the fine adjustment with CO
2
measurement in any case.
Fig. 6-6
Setting the recirculation gap
Fig. 6-7
Flame tube and recirculation gap
1
Adjusting screw for recirculation gap
2
Scale recirculation gap
1
Recirculation gap
2
Flame tube
The scale (fig 6-6, pos. 2) shows the set width of the recirculation gap (in mm). If the nozzle tube or the oil
preheater are changed or an oil nozzle type different from the regular production type is used, there can be
a difference between the scale display and the actual width of the recirculation gap.
