Pilot Flame Characteristics - Empire Comfort Systems VFL20IN3 series Owner's Manual

Figures 29 and 30 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 31 and 32 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.
THERMOPILE
(VFRL ONLY)
THERMOCOUPLE
(LPG)
Correct Pilot Flame Pattern for MILLIVOLT
THERMOCOUPLE
(LPG)
Correct Pilot Flame Pattern for INTERMITTENT PILOT
Page 34

PILOT FLAME CHARACTERISTICS

PILOT
THERMOCOUPLE
(NATURAL)
Figure 29
PILOT
THERMOCOUPLE
(NATURAL)
Figure 30
THERMOPILE
(VFRL ONLY)
THERMOCOUPLE
(LPG)
Incorrect Pilot Flame Pattern for MILLIVOLT
THERMOCOUPLE
(LPG)
Incorrect Flame Pattern for INTERMITTENT PILOT
If pilot flame pattern is incorrect, as shown in Figures 31 and 32
• See Troubleshooting, page 37.
PILOT
THERMOCOUPLE
(NATURAL)
Figure 31
PILOT
THERMOCOUPLE
(NATURAL)
Figure 32
28040-5-1211