INSPECTING BURNERS
Pilot Flame Pattern
Main Burner
Front Burner Flame Pattern (VTGF33 Series Only)
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INSPECTING BURNERS
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.
Pilot Burner
Thermocouple
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 59 - Correct Pilot Flame Pattern (Natural Gas Pilot Assy Shown)
Pilot Burner
Thermocouple
Figure 60 - Incorrect Pilot Flame Pattern (Natural Gas Pilot Assy Shown)
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 61 - Correct Front Burner Flame Pattern
Yellow Tipping At Top
of Blue Flame
Figure 62 - Incorrect Front Burner Flame Pattern
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