Flame Appearance; Pilot Flame; Burner Flame - Vermont Castings NBST27 Installation Instructions Manual

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 flames visually during operation.
CHECk THE PILOT FLAME
The pilot flame must always be present when the heater is in operation. It should just touch
the top of the thermocouple tip for natural. Refer to Figure 28 for correct pilot flame.
If the pilot flame does not touch the thermocouple, then the main burner cannot function reliably.
Figure 29 for incorrect shape of pilot flame.
Thermocouple for
Natural Gas
Thermocouple
for LP
Figure 28 -
Correct Pilot Flame Appearance
CHECk BURNER FLAME APPEARANCE
In normal operation at full rate after 15 minutes, the flames
should appear as shown in Figure 30.
The flames should be yellow and extend 3-4" above the
log top surfaces. The yellow flames should not impinge
on the logs.
Figure 30 -
Correct Burner Flame Appear-
ance
81D3032
FP2272
FP2272
pilot correct flame
NBST27 Unvented Gas Log Set
Thermocouple for
Natural Gas
Thermocouple
for LP
Figure 29 -
Incorrect Pilot Flame Appearance
LG661
NBST log flames
FP2273
FP2273
pilot bad flame
LG661
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