Pilot Flame Characteristics - Empire Comfort Systems VFD20MS30N-1 Installation Instructions And Owner's Manual

Figures 10 and 12 show a correct pilot flame pattern. The correct
flame will be blue and will extend beyond the thermocouple and
thermopile. The flame will surround the thermocouple and ther-
mopile just below the tip. A slight yellow flame may occur where
the pilot flame and main burner flame meet. Figures 11 and 13
show an incorrect pilot flame pattern. The incorrect pilot flame is
not touching the thermocouple or thermopile. This will cause the
thermocouple or thermopile to cool. When the thermocouple cools,
the heater will shut down.
MILLIVOLT PILOT
Correct Pilot Flame Pattern
Incorrect Pilot Flame Pattern
If pilot flame pattern is incorrect, as shown in Figure 11:
• See Troubleshooting, pages 20 and 21.
Page 22

PILOT FLAME CHARACTERISTICS

Figure 10
Figure 11
INTERMITTANT PILOT
Correct Pilot Flame Pattern
Incorrect Pilot Flame Pattern
If pilot flame pattern is incorrect, as shown in Figure 13:
• See Troubleshooting, pages 25 to 27.
Figure 12
Figure 13
42605-3-0621