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10090943EN
7.7. Combustion Air Adjustment
Make sure that air, required by the burner, enters the boiler room through the fresh air
ventilator. The ventilator must not be closed. The fresh air inlet must be led to the top of the
room. Eventual outlet valve has to be closed in wintertime.
Check, that the self-closing air flap (5) moves easy and that it is positioned according to the
drawing.
Loosen the locking screw (2) and turn the setting scale (1). Tighten the locking screw after
having found the right combustion air quantity.
1 Air setting scale
2 Locking screw of air
adjustment
3 Indicator
4 Air
intake
5 Self-closing air flap
Coarse combustion air setting, as example burner LJ 10
Oil pump pressure 10 bar (factory setting).
Nozzle
USgal/h
Position of air setting
scale
0,50 approx.
3,5
0,55 approx.
5,0
0,60 approx.
10,0
Note!
Only coarse adjustment can be made by observation. Fine setting usually needs flue
gas analysis. The burner has to reach in modern oil heating appliances as far as
combustion is concerned, the following performance characteristics:
Residual oxygen content (O
2
)
3 - 5 %
Carbon dioxide content (CO
2
)
12 - 13,5 %
Carbon monoxide content (CO) < 100 ppm
Smoke number
< 1 BH
