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108117-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
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INSPECTING BURNERS
Pilot Flame Pattern
Main Burner
Front Burner Flame Pattern (VTGF33 Series Only)
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 59 shows a correct pilot flame pattern. Figure 60 shows an
incorrect pilot flame pattern. The incorrect pilot flame is not
properly heating the thermocouple. When the thermocouple cools,
the heater will shut down.
If pilot flame pattern is incorrect, as shown in Figure 60
• turn heater off (see To Turn Off Gas to Appliance, page 26)
• see Troubleshooting, pages 29 through 31
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.
INSPECTING BURNERS
MAIN BURNER
Periodically inspect all burner flame holes with the heater running. All
slotted burner flame holes should be open with flame present. All round
burner flame holes should be open with a small blue flame present. Some
burner flame holes may become blocked by debris or rust, with no flame
present. If so, turn off heater and let cool. Remove blockage, blocked
burner flame holes may create soot.
Figure 59 - Correct Pilot Flame Pattern (Natural Gas Pilot Assy
Shown)
Figure 60 - Incorrect Pilot Flame Pattern (Natural Gas Pilot Assy
Shown)
Thermocouple
Pilot Burner
Thermocouple
Pilot Burner
FRONT BURNER FLAME PATTERN (VTGF33
SERIES ONLY)
Figure 61 shows correct front burner flame pattern. Figure 62 shows
incorrect front burner flame pattern. The incorrect burner flame pattern
shows yellow tipping at top of blue flame.
WARNING: If front burner flame pattern shows
yellow tipping, your fireplace could produce increased
levels of carbon monoxide. Follow instructions at
bottom of this page. Yellow flame on rear burner is
normal.
NOTICE: Do not mistake orange flames with yellow
tipping. Dirt or other fine particles are burned by
fireplace, causing brief patches of orange flame.
If front burner flame pattern is incorrect, as shown in Figure 62
• turn fireplace off (see To Turn Off Gas to Appliance, page 26)
• see Troubleshooting, pages 29 through 31
Figure 62 - Incorrect Front Burner Flame Pattern
Figure 61 - Correct Front Burner Flame Pattern
Yellow Tipping At Top
of Blue Flame