24
101308
INSPECTING
BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern. Figure 25 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.
Thermocouple
Pilot Burner
Figure 24 - Correct Pilot
Flame Pattern
Pilot Burner
Thermocouple
Figure 25 - Incorrect Pilot
Flame Pattern
If pilot flame pattern is incorrect, as shown in Figure 25
• turn heater off (see To Turn Off Gas to Appliance, page 21 [thermostat-con-
trolled models] or page 23 [manually-controlled models])
• see Troubleshooting, pages 25 through 28
FRONT BURNER FLAME PATTERN
Figure 26 shows correct front burner flame pattern. Figure 27 shows incorrect front burner
flame pattern. The incorrect burner flame pattern shows yellow tipping at top of blue flame.
If front burner flame pattern is incorrect, as shown in Figure 27
• turn heater off (see To Turn Off Gas to Appliance, page 21 [thermostat-con-
trolled models] or page 23 [manually-controlled models])
• see Troubleshooting, pages 25 through 28
CORRECT FLAME PATTERN AT HIGH POSITION
INCORRECT FLAME PATTERN AT HIGH POSITION
Figure 27 - Incorrect Front Burner Flame Pattern
Figure 26 - Correct Front Burner Flame Pattern
Yellow
Tipping
At Top
of Blue
Flame
WARNING ICON
G 001
WARNING
If yellow tipping occurs, your heater could produce increased levels
of carbon monoxide. If front burner flame pattern shows yellow
tipping, follow instructions at bottom of this page. Yellow flame on rear
burner is normal.
NOTICE
Do not mistake orange flames with yellow tipping. Dirt or other fine
particles are burned by heater, causing brief patches of orange flame.
Summary of Contents for CF18N
Page 38: ...38 101308 NOTES...
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