Burner Flame Adjustments - Lennox MERIT PLUS SERIES Homeowner's Care And Operation Instructions Manual

10. Place Log (E) as shown in Figure 11.
Position round end of log (E) against the notch of
log (D) here. Two charred spots face the front
E
C
Position Small End of
Log (E) on The Notch of
Log (C) Here
11. Place Log (F) as shown in Figure 12.
Log (F) sits in front of the grate
(Valve Access Side)
WARNING
This appliance is not designed
to burn wood. Any attempt to
do so could cause irreparable
damage to appliance and prove
hazardous to your safety.
WARNING
If logs are not installed according
to the log installation instructions,
fl ame impingement and improper
combustion could occur and result
in soot and/or excessive produc-
tion of carbon monoxide (CO), a
colorless, odorless, toxic gas.
WARNING
DO NOT attempt to install the logs
until the appliance installation has
been completed, the gas line con-
nected and tested for leaks and the
initial burner operation has been
checked out.
10
Logs get very hot and will remain hot up to one hour after gas supply is
turned off. Handle only when logs are cool. Turn off all electricity to the
appliance before you install grate and logs.
D
BURNER ADJUSTMENTS
If the air shutter openings closed too far, sooting may develop. Sooting is indicated by black puffs
developing at the tips of very long orange fl ames. Sooting results in black deposits forming on the
logs, appliance inside surfaces and on exterior surfaces adjacent to the vent termination. Sooting is
caused by incomplete combustion in the fl ames and lack of combustion air entering the air shutter
opening. To achieve a warm yellowish-orange fl ame with an orange body that does not soot, the
(Valve Access Side)
shutter opening must be adjusted between these two extremes.
Figure 11
Air Shutter Adjustment Guidelines
• If there is smoke or soot present, fi rst check the log set positioning to ensure that the fl ames are
not impinging on any of the logs. If the log set is properly positioned and a sooting condition
still exists, then the air shutter opening should be increased.
• The more offsets in the vent system, the larger the air shutter opening will need to be.
• An appliance operated with the air shutter opened too far, may have fl ames that appear blue
and transparent. These weak, blue and transparent fl ames are termed anemic.
• Propane models may exhibit fl ames which candle or appear stringy. If this is present and persists,
adjust the air shutter to a more closed position, then operate the appliance for a few more minutes
to ensure that the fl ame normalizes and the fl ames do not appear sooty.
Flame Appearance & Sooting
Proper fl ame appearance is a fl ame which is blue at the base and becomes yellowish-orange in
the body of the fl ame. When the appliance is fi rst lit, the entire fl ame may be blue and will gradu-
ally turn yellowish-orange during the fi rst 15 minutes of operation. If after period the fl ame stays
lowered blue, or if the fl ame is orange with evidence of sooting (black tip), the air shutter opening
Figure 12
F
may need to be adjusted.
Figure 13 -
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
WARNING
(QUALIFIED TECHNICIANS ONLY)
Vermiculite
Burner Flame Appearance