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24632-0-0508 Page 39
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On the main burner, the burning gas forms a primary
flame and a secondary flame. The primary flame is blue
and about 3/16" (5 mm) high. The secondary flame is
very pale blue, 3" (76 mm) to 5" (127 mm) high. Dust in
the combustion air will produce an orange flame. Do not
mistake it for an improper yellow flame.
The pilot flame is blue and goes toward the main burner
and thermocouple horizontally. A slight yellow tip on the
flame is normal. The pilot flame must surround and extend
approximately 1/4" (6 mm) beyond the thermocouple, and
must extend beyond the first row toward the second row
of main burner ports.
PILOT FLAME CHARACTERISTICS
MAIN BURNER FLAME CHARACTERISTICS
THERMOCOUPLE
PILOT
FLAME
BURNER
CHANNEL
MAIN BURNER