Vanguard Heating VS24PR - Manual (Page 22)

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Figure 25 - Correct Pilot Flame Pattern
Pilot Burner
Thermocouple
Figure 26 - Incorrect Pilot Flame Pattern
WARNING
If yellow tipping occurs, your heater could produce increased levels of carbon monoxide.
If front burner flame pattern shows yellow tipping, follow instructions at bottom of this
page. Yellow flame on rear burner is normal.
CORRECT FLAME PATTERN AT HIGH POSITION
INCORRECT FLAME PATTERN AT HIGH POSITION
Figure 28 - Incorrect Front Burner Flame Pattern
Figure 27 - Correct Front Burner Flame Pattern
Yellow
Tipping At
Top of
Blue
Flame
INSPECTING
BURNERS
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 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 26
• turn heater off (see To Turn Off Gas to Appliance, page 20)
• see Troubleshooting, pages 23 through 25
FRONT BURNER FLAME PATTERN
Figure 27 shows correct front burner flame pattern. Figure 28 shows incorrect front burner flame pattern.
The incorrect burner flame pattern shows yellow tipping at top of blue flame.
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 burner flame pattern is incorrect, as shown in Figure 28
• turn heater off (see To Turn Off Gas to Appliance, page 20)
• see Troubleshooting, pages 23 through 25
Pilot Burner
Thermocouple