Desa VTGF33NRA - Manual (Page 24)

www.desatech.com 110112-01C 24
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 41 shows a correct pilot flame pattern.
Figure 42 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 42
• turn heater off (see To Turn Off Gas to Appliance,
page 22)
• see Troubleshooting, page 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
Figure 41 - Correct Pilot Flame Pattern
(Propane/LP Pilot Shown)
Figure 42 - Incorrect Pilot Flame Pattern
(Natural Gas Pilot Shown)
Pilot
Burner
Manual Ignitor Electrode
Automatic Ignitor
Electrode
Thermocouple
Manual Ignitor Electrode
Automatic Ignitor
Electrode
BURNER FLAME PATTERNS
Figure 43 shows correct front and/or middle burner
flame patterns. Figure 44 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 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 44
• turn heater off (see To Turn Off Gas to Appli-
ance , page 22
• see Troubleshooting, page 26
Yellow Tipping
At Top of Blue
Flame
Figure 43 - Correct Burner Flame
Patterns
Figure 44 - Incorrect Burner Flame
Patterns