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Page 2123099-1-0707
Figures 21 and 22 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 23 and 24 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.
Correct Pilot Flame Pattern for VFDR
Figure 21
Correct Pilot Flame Pattern for VFDT & VFDM
Figure 22
Incorrect Pilot Flame Pattern for VFDR
Figure 23
Incorrect Flame Pattern for VFDT & VFDM
Figure 24
If pilot flame pattern is incorrect, as shown in Figures 23 and 24
• See Troubleshooting, page 23.
THERMOPILE
(VFDR
ONLY)
PILOT
THERMOCOUPLE
(NATURAL)
THERMOCOUPLE
(LPG)
THERMOPILE
(VFDR ONLY)
PILOT
THERMOCOUPLE
(NATURAL)
THERMOCOUPLE
(LPG)
PILOT FLAME CHARACTERISTICS