Lennox NV35IN Care And Operation Instructions Manual page 14

LENNOX HEARTH PRODUCTS • SIGNATURE
Removing the glass door
1. Remove the top louver.
2. Remove the left and right side finish
trim gap fillers (Figure 16).
3. Remove the surround trim assembly by
detaching it at the top of the fireplace
and lifting it 1 in. to disengage the side
tabs, then pulling it away from the
fireplace exposing the front glass door
(Figure 15).
4. Locate the four (4) spring-loaded
latches; two above and two below the
enclosure (Figure 13).
5. Release the lower latches, by pulling
each handle out and down to unhook
it from the glass door. Lightly press
against the door, to hold it in position,
while releasing the two upper latches.
6. Carefully grip the door at the top
and bottom, and remove it from the
fireplace. Place the door in a secure
location where it will not be damaged.
Replacing the fireplace lamp lightbulb
1. Remove the fireplace glass door.
2. Locate the lamp inside the top, front of
the firebox.
3. Using a 5/16 in. nut driver, remove the
two (2) outside screws securing the
lamp glass cover bracket. Carefully,
remove the metal bracket, lamp glass
cover, and gasket. Retain all items with
the screws in a secure location for
later reinstallation.
4. Unscrew the lightbulb cap and retain in
a secure location for later reinstallation.
5. Unscrew the lightbulb and discard.
6. Install the new lightbulb.
NOTE: Use only 25 W, 572 °F (300 °C)
rated oven lightbulbs.
7. Reinstall the lightbulb cap.
8. Carefully, position the gasket, lamp
glass cover, and metal bracket into
place and secure using the two (2)
screws previously removed.
9. Reinstall the glass door.
Adjusting the Burner to Ensure Proper
Flame Appearance
WARNING
• Air shutter adjustment
should only be performed
by a qualified professional
service technician.
• Ensure front glass panel
is in place and sealed
during adjustment.
14
SERIES DIRECT-VENT GAS FIREPLACES • ENVY/ENVY CD 35/40/45 • CARE AND OPERATIONS
®
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. Exercise caution to
avoid injury while adjusting
flame appearance.
Flame Appearance and Sooting
The flame should be blue at the base, and
yellow-orange in the body of the flame.
When the appliance is first lit, the entire
flame may be blue and will gradually turn
yellow-orange during the first 15 minutes
of operation. If the flame remains blue, or if
the flame is orange with evidence of sooting
(black tip), the air shutter opening may need
to be adjusted.
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 logs, appliance
inside surfaces, and on exterior surfaces
adjacent to the vent termination.
Sooting is caused by incomplete
combustion in the flames and lack of
combustion air entering the air shutter
opening. To achieve a warm yellow-orange
flame with an orange body that does not
soot, the shutter opening must be adjusted
between these two extremes.
Air Shutter Adjustment Guidelines
• If there is smoke or soot present, first
check the log set positioning to ensure
that the flames 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 flames
that appear blue and transparent. These
weak, blue and transparent flames are
termed anemic.
• Propane models may exhibit flames
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 flame
normalizes and the flames do not
appear sooty.
The following chart is provided to aid you in
achieving the correct air shutter adjustment
for your installation.
DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Table 6: Air Shutter Adjustment Guidelines
Amount of
Flame Color
Primary Air
If air shutter
Flame will
is closed
be orange
too far
If air shutter
Flame will
is open
be blue
too far
1. Remove the top louver and the
surround trim assembly.
2. Locate the air shutter adjustment rod
in the lower control compartment
(Figure 17), and adjust it to the
standard setting.
NOTE: Pull the rod out to close, and
push the rod in to open the air shutter.
3. Light appliance (follow lighting
procedure on lighting label in control
compartment or the Care and
Operations Manual).
4. Allow the burner to operate for at
least 15 minutes while observing the
flame continuously to ensure that the
proper flame appearance has been
achieved (Figure 18 and Figure 19). If
the following conditions are present,
adjust accordingly. If flame appears
weak or sooty, adjust the air shutter,
incrementally, to a more open position
until the proper flame appearance is
achieved. If flame remains blue, adjust
the air shutter, incrementally, to a more
closed position until the proper flame
appearance is achieved.
5. When satisfied that the burner flame
appearance is normal, reinstall the
lower control compartment door then
proceed to finish the installation.
Figure 17: Air Shutter Adjustment Rod
Air Shutter
Adjustment Rod
Figure 18: Traditional Fireplaces
Flame Appearance
Air Shutter
Adjustment
Air shutter
gap should be
increased
Air shutter
gap should be
decreased