Vanguard Heating VP26TA VN30A, VP26A Pilot Flame Pattern, Burner Flame Pattern, Thermocouple

INSPECTING HEATER

Check pilot flame pattern and burner flame pat- tern often.

PILOT FLAME PATTERN

Figure 27 shows a correct pilot flame pattern. Figure 28 shows an incorrect pilot flame pattern. The incor- rect 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 Fig- ure 28

•turn heater off (see To Turn Off Gas to Appli- ance, page 15 or 17, depending on your model)

•see Troubleshooting, pages 20 through 22 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.

Blue Flame

Pilot Burner

Thermocouple

GOOD PILOT/LP GRH/OV 007

Figure 27 - Correct Pilot Flame Pattern

Yellow Flame

Thermocouple	Pilot Burner
BAD PILOT/LP	GRH/OV 008

Figure 28 - Incorrect Pilot Flame Pattern

BURNER FLAME PATTERN

Figure 29 shows a correct burner flame pattern. Figure 30 shows an incorrect burner flame pattern.

If burner flame pattern is incorrect, as shown in Figure 30

•turn heater off (see To Turn Off Gas to Appli- ance, page 15 or 17, depending on your model)

•see Troubleshooting, pages 20 through 22

Figure 29 - Correct Burner Flame Pattern

Bad Burner Pattern-Plaque GRH/OV 019

Figure 30 - Incorrect Burner Flame

Pattern

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