Inspecting Burners; Technical Service - Desa CDR3924NT Owner's Operation And Installation Manual

INSPECTING bURNERS

Check pilot flame pattern and burner flame pat-
terns 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.
If pilot flame pattern is incorrect, as shown in
Figure 25
• turn heater off (see To Turn Off Gas to Appli-
ance, page 17)
• see Troubleshooting, pages 20
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.
Thermocouple
Pilot Burner
(Natural Gas)
Figure 24 - Correct Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Pilot Burner
Thermocouple
(Natural Gas)
Figure 25 - Incorrect Pilot Flame Pattern
(Your pilot may vary from pilots shown)
BURNER FLAME PATTERNS
Figure 26 shows correct burner flame patterns.
Figure 27 shows incorrect burner flame patterns.
The incorrect burner flame patterns show yellow
tipping at top of blue flame.
18
Pilot Burner
(Propane/LP Gas)
Pilot Burner
(Propane/LP Gas)
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 burner flame patterns are incorrect, as shown
in Figure 27
• turn heater off (see To Turn Off Gas to Appli-
ance, page 17)
• see Troubleshooting, page 20
Figure 26 - Correct Burner Flame
Patterns
Yellow Tipping At
Top of Blue Flame
Figure 27 - Incorrect Burner Flame
Patterns

TECHNICAL SERVICE

You may have further questions about installation,
operation or troubleshooting. If so, contact DESA
Heating Products' Technical Service Department at
1-866-672-6040. When calling, please have your
model and serial numbers of your heater ready.
You can also visit DESA Heating Products' techni-
cal services web site at www.desatech.com.
113183-01F