Variable Flame Adjustment; Maintenance; Control Compartment Access; Front Glass Enclosure Panel, Removal And Installation - Lennox Hearth Products MDT3328CNM Care And Operation Instructions Manual

33" direct-vent gas fireplace heaters
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Manifold
Pressure Port
Piezo Ignitor
Variable Flame
Height Adjustment
Figure 2
Variable Flame Height Adjustment
1.These appliances are equipped with a vari-
able gas control valve. Flame height for these
models may be adjusted through a range be-
tween fixed low and high settings, alternately,
while the appliance is in operation. Adjust the
flame height as desired after lighting the appli-
ance by rotating the variable adjustment con-
trol knob located on the front of the valve (refer
to Figure 2 ).
2. When lit for the first time, this appliance will
emit a slight odor for an hour or two. This is
due to the "burn-in" of internal paints and
lubricants used in the manufacturing process.
3. Keep lower control compartment clean by
vacuuming or brushing at least twice a year.
More frequent cleaning may be required due to
excessive lint from carpeting, bedding materi-
als, etc. It is important that control compart-
ments, burners and circulating air passage-
ways of the appliance be kept clean.
4. Always turn off gas to the pilot before
cleaning. Before re-lighting, refer to the light-
ing instructions in this manual. Instructions
are also found on a pullout lighting instruction
labels attached to the gas control valve.
5. Always keep the appliance area clear and
free from combustible materials, gasoline and
other flammable liquids.
6. Remember, these appliances have a continu-
ous burning pilot flame. Exercise caution when
using products with combustible vapors.
4
Inlet
Pressure Port
Piezo Ignitor
Optional ON/OFF Rocker Switch
Main Gas
Location (One of Two Places)
Control Knob
7. Clean the front glass enclosure only when
necessary. Wipe surface with clean, damp-
ened, soft cloth. Follow with dry, soft towel as
desired. Take care not to scratch the glass
surface.
WARNING: DO NOT USE ABRASIVE
CLEANERS. NEVER CLEAN THE GLASS
WHEN IT IS HOT.
CAUTION: DO NOT ATTEMPT TO TOUCH THE
FRONT ENCLOSURE GLASS WITH YOUR
HANDS WHILE THE FIREPLACE IS IN USE.

Maintenance

The appliance and venting system should be
thoroughly inspected before initial use and at
least annually by a qualified service techni-
cian. However, more frequent periodic inspec-
tions and cleanings should be performed by
the homeowner. Homeowner must contact a
qualified service technician at once if any
abnormal condition is observed.
Refer to the maintenance schedule for main-
tenance tasks, procedures, periodicity and
by whom they should be performed. Always
verify proper operation of the appliance af-
ter servicing.
IMPORTANT: TURN OFF GAS AND ANY ELEC-
TRICAL POWER BEFORE SERVICING THE
APPLIANCE.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Front Glass Enclosure Panel, Removal
and Installation.
WARNING: NEVER OPERATE THE APPLI-
ANCE WITHOUT THE FRONT GLASS EN-
CLOSURE PANEL IN PLACE AND SECURE.
DO NOT OPERATE APPLIANCE WITH
FRONT GLASS CRACKED, BROKEN OR
MISSING. REPLACEMENT MUST BE
DONE BY A LICENSED OR QUALIFIED
SERVICE TECHNICIAN.
These are direct-vent appliances. They are
designed to operate only when the front glass
enclosure panel is installed. Generally the
front glass enclosure panel should not be
removed except to gain access to the compo-
nents within the firebox, and the appliance
may only be operated without the front glass
enclosure panel in place for very brief periods
of time during appliance checkout and adjust-
ment. Be sure that the flame appearance will
be diminished while the front glass enclosure
panel is removed.
WARNING: HANDLE THIS GLASS WITH
EXTREME CARE! TEMPERED GLASS IS
SUSCEPTIBLE TO DAMAGE – DO NOT
SCRATCH OR HANDLE ROUGHLY WHILE
REINSTALLING THE GLASS DOOR
FRAME.

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