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114683-01B
18
BURNER FLAME PATTERN
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles enter the
heater and burn causing brief
patches of orange flame.
Figure 25 shows a correct burner flame pattern.
Figure 26 shows an incorrect burner flame pattern.
The incorrect burner flame pattern shows yellow
tipping of the flame. It also shows the flame higher
than 1/2 the heat shield height.
If burner flame pattern is incorrect, as shown in
Figure 26
• turn heater off (see To Turn Off Gas To Appli
-
ance, page 16 or 17)
• see Troubleshooting
, page 20
INSPECTING HEATER
Check pilot flame pattern and burner flame pat-
tern often.
PILOT FLAME PATTERN
Figure 23 shows a correct pilot flame pattern.
Figure 24 shows an incorrect pilot flame pattern.
The incorrect pilot flame is not touching the
thermocouple. This will cause the thermocouple
to cool. When the thermocouple cools, the heater
will shut down.
If pilot flame pattern is incorrect, as shown in
Figure 24
• turn heater off (see To Turn Off Gas to Appli
-
ance, page 16 or 17)
• see Troubleshooting
, page 20
Note: The pilot flame on natural gas units will
have a slight curve, but flame should be blue and
have no yellow or orange color.
Figure 24 - Incorrect Pilot Flame Pattern
Figure 23 - Correct Pilot Flame Pattern
Thermocouple
Pilot Burner
Pilot
Burner
Thermocouple
Blue Flame
Yellow Flame
Figure 25 - Correct Burner Flame Pattern
Yellow
Tipping
Figure 26 - Incorrect Burner Flame
Pattern
Heat
1
/
2
Shield
Height
Blue
Flame
Heat
1
/
2
Shield
Height