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110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
22
Yellow Tipping At
Top of Blue Flame
Pilot Burner
Thermocouple
Pilot Burner
Pilot Burner
Thermocouple
BURNER FLAME PATTERNS
Figure 38 shows correct front and/or middle burner flame patterns. 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-
mostat-Controlled Models] or page 20 [Remote-Ready Models])
• see Troubleshooting, pages 24 through 26
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-
mostat-Controlled Models] or page 20 [Remote-Ready Models])
• 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.
Figure 39 - Correct Burner Flame Patterns
Figure 40 - Incorrect Burner Flame Patterns (VRL Models only)
INSPECTING BURNERS
Pilot Flame Pattern
Burner Flame Patterns
Figure 37 - Correct Pilot Flame Pattern (Your pilot may vary from
pilots shown)
Figure 38 - Incorrect Pilot Flame Pattern (Your pilot may vary
from pilots shown)
Thermocouple
Correct Front and Middle Burner Flame Patterns for VRL24NT/PT,
VRL24NR/PR, VRL30NT/PT and VRL30NR/PR Models
Incorrect 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
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 Middle Burner Flame Pattern for
CTB3924NT/PT and CTB3924NR/PR Models
Yellow Tipping At
Top of Blue Flame
Correct Front and Middle Burner Flame Patterns for
CSG3924NT/PT, CSG3924NR/PR, and CSG3930NR/PR Models
(Natural Gas)
(Propane/LP Gas)
(Propane/LP Gas)
(Natural Gas)
Pilot Burner
Thermocouple