A secondary air shutter is used to adjust the burner according to back pressure in the
combustion chamber to get maximum fuel combustion. NORTEC WB burners are single-stage
with manual adjustment of the shutter.
To do the adjustment loose screw A (pic. 7) and get the amount of CO
2
in waste gas within 10-
11,5% by adjusting the air shutter, then tighten screw A.
Pic.7 Secondary air shutter
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