Problems With the Flame Pattern Tall, narrow, yellow flames
These flames can soot the vent system and may be the result of insufficient oxygen supply. Check for correct air volume by measuring the opening (fig.22) at the air shutter. Correct opening dimensions are normally:
Burner Orifice
For Propane - Open 18.5 mm
For Natural Gas - Open 21.5 mm
Warning! To avoid burns, do not adjust the air opening until the burner has cooled down. Blocked orifice: Make sure the main orifice (fig.28) is dirt-free and that the orifice has the appropriate size. See technical data. Poor draught in the vent system may be due to improper installation or because the vent has no climb towards the chimney.
Tall, blue flames
The cause may be too much oxygen. Check for correct air volume by measuring the opening (fig. 20) at the air shutter. The cause may also be that the gas pressure is too high. Check the gas pressure as described in the section about gas pressure on page 10.
Figure 28. Remove burner assembly and burner skirt to access the burner injector. Check orifice for debris.
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