Specifications

20

NBST27 Unvented Gas Log Set


 In addition, periodically check the flames visually during operation.

It should just touch
the top of the thermocouple tip for natural. Refer tofor correct pilot flame.
If the pilot flame does not touch the thermocouple, then the main burner cannot function reliably.
for incorrect shape of pilot flame.
FP2272
pilot correct flame
Thermocouple for
Natural Gas
Thermocouple
for LP
FP2272
Figure 29 -
Correct Pilot Flame Appearance
FP2273
pilot bad flame
Thermocouple for
Natural Gas
Thermocouple
for LP
FP2273
Figure 30 -
Incorrect Pilot Flame Appearance
LG661
NBST log flames

In normal operation at full rate after 15 minutes, the flames
should appear as shown in Figure 31.
The flames should be yellow and extend 3-4” above the
log top surfaces. The yellow flames should not impinge
on the logs.
Figure 31 -
Correct Burner Flame Appear-
ance
LG661