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LENNOX HEARTH PRODUCTS • RHAPSODY™ LINEAR DIRECT-VENT GAS FIREPLACES (MODELS RHAP42N & RHAP54N) • CARE AND OPERATION INSTRUCTIONS
Flame Appearance and Sooting
Proper flame appearance is a flame that is
blue at the base and becomes yellowish-
orange in the body of the flame. When the
appliance is first lit, the entire flame may be
blue and will gradually turn yellowish-orange
during the first 30 minutes of operation. After
30 minutes of operation, if the flame is blue,
or if the flame is orange with evidence of soot-
ing (black tip), the air shutter opening may
need to be adjusted, changing the air-to-fuel
mixture in the burner.
If the air shutter opening is closed too far,
sooting may develop. Sooting is indicated
by black puffs developing at the tips of very
long orange flames. Sooting results in black
deposits forming on the inside surfaces of the
fireplace and on exterior surfaces adjacent to
the vent termination.
Sooting is caused by incomplete combus-
tion in the flames and lack of combustion air
entering the air shutter opening. To achieve
a warm yellowish-orange flame with an
orange body that does not soot, the shutter
opening must be adjusted between these two
extremes.
Air Shutter Adjustment Guidelines
WARNING
• Air shutter adjustment should
only be performed by a qualified
professional service technician.
• Ensure glass door assembly is
in place and sealed during adjust-
ment.
• If there is smoke or soot present, first ensure
that the flames are not touching any of the
panels. If the panels are properly positioned
and a sooting condition still exists, increase
the air shutter opening.
• The more offsets in the vent system, the
larger the air shutter opening will need to be.
• The length and configuration of the chimney
vent will affect flame appearance.
• An appliance operated with the air shutter
opened too far may have flames that appear
blue and transparent. These weak, blue and
transparent flames are termed anemic.
• Propane models may exhibit flames that
candle or appear stringy. If this is present
and persists, adjust the air shutter to a more
OPEN position, then operate the appliance for
a few more minutes to ensure that the flame
normalizes and the flames do not appear
sooty.
Figure 2: Proper Flame Appearance
Air Shutter Adjustment Lever
(Below lower edge of door assembly.
Remove optional bezel first, if installed.)
Figure 3: Air Shutter Adjustment Lever
The following chart is provided to aid you in
achieving the correct air shutter adjustment
for your installation:
Air Shutter Adjustment Guidelines
Amount of
Flame
Primary Air
Color
If air shutter is
Flame will
closed too far
be orange
If air shutter is
Flame will
open too far
be blue
CAUTION
• Soot will be produced if the air
shutter is closed too much. Any
damage due to sooting resulting
from improperly setting the air
shutter is not covered under the
warranty.
• The air shutter door and nearby
appliance surfaces are hot. Exer-
cise caution to avoid injury while
adjusting flame appearance.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Glass Door Assembly
(Lower Right Corner)
Air Shutter Adjustment Procedure
To adjust the air shutter for proper flame
appearance (as illustrated in Figure 2):
1. Before adjusting the air shutter, allow the
Air Shutter
burner to operate for at least 30 minutes
Adjustment
while continuously observing the flame.
Air shutter
2. Adjust the air shutter using the lever on the
gap should be
lower right side of the firebox (Figure 3).
increased
• For more CLOSED air shutter, PULL
Air shutter
gap should be
lever OUT (toward front of fireplace).
decreased
• For more OPEN air shutter, PUSH
lever IN (toward back of fireplace).
• If the flame appears weak or sooty, adjust the
air shutter until proper flame appearance is
achieved.
• If the flame stays lowered blue, incrementally
adjust the air shutter to a more CLOSED
position until proper flame appearance is
achieved.
9
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