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Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 25 shows a correct pilot flame pattern.
Figure 26 shows an incorrect pilot flame pat-
tern. The incorrect pilot flame is not touching
the thermocouple. This will cause the thermo-
couple to cool. When the thermocouple cools,
the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 26
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 19
• see Troubleshooting, page 22
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.
Pilot
Thermocouple
Burner
Figure 25 - Correct
Pilot Flame Pattern
(Natural Gas Pilot
Shown)
BURNER FLAME PATTERNS
Figure 27 shows correct front and/or middle
burner flame patterns. Figure 28 shows incor-
rect front and/or middle burner flame patterns.
The incorrect burner flame patterns show
yellow tipping at top of blue flame.
WARNING: Turn off heater
and let cool before cleaning.
20
INSPECTING BURNERS
Thermocouple
Pilot
Burner
Figure 26 - Incorrect
Pilot Flame Pattern
(Natural Gas Pilot
Shown)
CLEANING AND MAINTENANCE
www.desatech.com
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide. If burner flame pat-
terns show yellow tipping, follow
instructions 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 28
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 19
• see Troubleshooting, page 22
Figure 27 - Correct Burner Flame
Patterns
Yellow
Tipping At
Top of Blue
Flame
Figure 28 - Incorrect Burner Flame
Patterns
CAUTION: You must keep
control areas, burner and circu-
lating air passageways of heater
clean. Inspect these areas of
heater before each use. Have
heater inspected yearly by a
qualified service person. Heater
may need more frequent clean-
ing due to excessive lint from
carpeting, bedding material, pet
hair, etc.
123551-01D
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