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INSPECTING BURNERS
Pilot Flame Pattern Burner Flame Patterns
INSPECTING BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 37 shows a correct pilot flame pattern. Figure 38 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 38
•turn heater off (see To Turn Off Gas to Appliance, page 18 [Ther-
•see Troubleshooting, pages 24 through 26
Note: The pilot flame on natural gas units will have a slight curve, but the flame should be blue and have no yellow or orange color.
Pilot Burner Thermocouple Pilot Burner
| Thermocouple |
(Natural Gas) | (Propane/LP Gas) |
Figure 37 - Correct Pilot Flame Pattern (Your pilot may vary from
pilots shown) | Thermocouple |
Pilot Burner | Thermocouple Pilot Burner |
(Propane/LP Gas)
Figure 38 - Incorrect Pilot Flame Pattern (Your pilot may vary from pilots shown)
BURNER FLAME PATTERNS
Figure38 showscorrectfrontand/ormiddleburnerflamepatterns.Figure 40 shows incorrect front and/or middle burner flame patterns. The incorrect burner flame patterns show yellow tipping at top of blue flame.
WARNING: If yellow tipping occurs, your heater could produce increased levels of carbon monoxide. If burner flame patterns show yellow tipping, follow in- structions below. 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.
If front and/or middle burner flame patterns are incorrect, as shown in Figure 40
•turn heater off (see To Turn Off Gas to Appliance, page 18 [Ther-
•see Troubleshooting, pages 24 through 26
Correct Front and Middle Burner Flame Patterns for VRL24NT/PT,
VRL24NR/PR, VRL30NT/PT and VRL30NR/PR Models
Correct Front and Middle Burner Flame Patterns for
CSG3924NT/PT, CSG3924NR/PR, and CSG3930NR/PR Models
Correct Middle Burner Flame Pattern for
CTB3924NT/PT, and CTB3924NR/PR Models
Figure 39 - Correct Burner Flame Patterns
Yellow Tipping At
Top of Blue Flame
Incorrect Front and Middle Burner Flame Patterns for VRL24NT/PT,
VRL24NR/PR, VRL30NT/PT and VRL30NR/PR Models
Yellow Tipping At
Top of Blue Flame
Incorrect Front and Middle Burner Flame Patterns for
CSG3924NT/PT, CSG3924NR/PR, and CSG3930NR/PR Models
Yellow Tipping At 
Top of Blue Flame
Incorrect Middle Burner Flame Pattern for
CTB3924NT/PT and CTB3924NR/PR Models
Figure 40 - Incorrect Burner Flame Patterns (VRL Models only)
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