14
FLAME APPEARANCE
Flames from the pilot, front and rear burner should be visually checked as soon as the heater is installed. In
addition, periodically check the
fl
ames visually during operation.
PILOT FLAME
The pilot
fl
ame must always be present when the heater is in operation. It should just touch the top of the
thermocouple tip for natural. Refer to the
fi
gure below for correct pilot
fl
ame.
If the pilot
fl
ame does not touch the thermocouple, then the burners cannot function reliably. Refer to the
fi
gure below for incorrect shape of pilot
fl
ame.
MILLIVOLT CONTROL
BURNER FLAME
In normal operation at full rate after 15 minutes, the following
fl
ame appearances should be observed: The
left and right rear
fl
ames should be yellow and extend 1"- 2" above middle logs. The yellow
fl
ames should
not contact the logs. There should be glowing embers on the front surface of the middle log.
NOTE The
fl
ames and embers will be an opaque orange color during the burn off time.
Figure 13-
Correct Pilot Flame Appearance
Figure 14 -
Incorrect Pilot Flame Appearance
Thermocouple
for Natural
Thermocouple
for LP
Thermocouple
for LP
Thermocouple
for Natural
PIL
OT
OT
PILO
T
Figure 15-
Correct Burner Flame Appearance