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FLAME APPEARANCE
Figure 24 -
Place Log #8
LG657
NBST Log 8
9. Place log #9 on farthest right grate tine by aligning 'V'
notch in bottom of log with grate tine. Place rectangu-
lar notch in bottom of log onto rectangular protrusion
on log #8. Figure 25
Figure 25 -
LG658
Place Log #9
NBST log 9
10. Place log #10 by aligning two (2) rectangular notches
on bottom of log with rectangular protrusions on logs
#6 & #7. Make sure the ember or 'burnt' area of log is
facing center of burner. Figure 26
Log #10
Figure 26 -
Place Log #10
Monessen • NBST27 Gas Log Set Installation/Owner's Manual • 81D3032 • Rev A • 08/16
Log #8
Log #9
LG659
NBST Log 10
NBST27 Unvented Gas Log Set
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 27 for correct
pilot flame.
If the pilot flame does not touch the thermocouple, then the
main burner cannot function reliably. Figure 28 for incorrect
shape of pilot flame.
Thermo-
couple
for
Natural
Gas
Thermo-
couple
for LP
Figure 27 -
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 29.
FP2272
The flames should be yellow and extend 3-4" above the
pilot correct flame
log top surfaces. The yellow flames should not impinge
on the logs.
Figure 29 -
Correct Burner Flame Appearance
Thermo-
couple for
Natural Gas
Thermo-
couple
for LP
Figure 28 -
Incorrect Pilot Flame
Appearance
FP2273
pilot bad flame
LG661
NBST log flames
17
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