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Page 23
Figures 15, 17 and 19 show a correct pilot flame pattern. The correct
flame will be blue and will extend beyond the thermocouple. The
flame will surround the thermocouple just below the tip. A slight
yellow flame may occur where the pilot flame and main burner
flame meet. Figures 16, 18 and 20 show 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.
MILLIVOLT PILOT
Correct Pilot Flame Pattern
Figure 15
Incorrect Pilot Flame Pattern
Figure 16
If pilot flame pattern is incorrect, as shown in Figure 16
• See Troubleshooting, page 26.
HYDRAULIC THERMOSTAT PILOT
Correct Pilot Flame Pattern
Figure 17
Incorrect Pilot Flame Pattern
Figure 18
If pilot flame pattern is incorrect, as shown in Figure 18
• See Troubleshooting, page 26.
PILOT FLAME CHARACTERISTICS