Lennox Hearth Products MLDVTCD-35NE Installation Instructions Manual page 31

LENNOX HEARTH PRODUCTS • MERIT
Burner Air Shutter Adjustment Procedure
WARNINGS
• Air shutter adjustment should
only be performed by a quali-
fied professional service tech-
nician.
• Ensure front glass panel are
in place and sealed during
adjustment.
CAUTIONS
• Soot will be produced if the
air shutter is closed too much.
Any damage due to carboning
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.
• Ensure the air shutter setting
is at least equivalent to 1/2
of the air hole exposed when
operating the unit with pro-
pane gas.
1. Locate and adjust the air shutter to the
standard setting as shown in Figure 45.
2. Light appliance (follow lighting procedure
on lighting label in control compartment or
see the Care and Operations manual).
3. Allow the burner to operate for at least 15
minutes while observing the flame con-
tinuously to ensure that the proper flame
appearance has been achieved (see Figure
46). 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 stays lowered blue, adjust the air
shutter, incrementally, to a more closed
position until the proper flame appearance
is achieved.
4. Leave the control knob (off/pilot/on) in the
ON position and the burner ON/OFF switch
OFF (and remote switches, if applicable).
5. When satisfied that the burner flame appear-
ance is normal, re-install the lower control
compartment door then proceed to finish
the installation.
SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS
®
Burner Tube
Air Shutter
Figure 45 - Burner Air Shutter Adjustment
Figure 46 - Burner Flame Appearance Model MLDVTCD-35
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Adjustment Set-Screw
Opening Setting - Inches (millimeter)
Adjustment Rod Up
(closed min. position)
MLDVTCD-35
(River Stone And Beach Sand With Porcelain Panels Shown)
Main Burner Factory Air Shutter
Model Natural Gas Propane Gas
Expose Half
(Closed)
Of The Hole
Ref. Air shutter Patent:
U.S. Pat. 5,553,603
31