Outside Combustion Air Control - Lennox Hearth Products MPB-33 Homeowner's Care And Operation Instructions Manual

Variable Flame Height Adjustment
Manifold Pressure Port
Piezo Igniter
Figure 3
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 materials,
etc. It is important that control compartments,
burners and circulating air passageways of the
appliance be kept clean.
4. Always turn off gas to the pilot (millivolt
appliances) before cleaning. Before re-lighting,
refer to the lighting instructions in this manual.
Instructions are also found on a pull-out panel
located on the fl oor of the appliance.
5. Always keep the appliance area clear and
free from combustible materials, gasoline and
other fl ammable liquids.
6. Remember, Millivolt appliances have a
continuous burning pilot fl ame. Exercise cau-
tion when using products with combustible
vapors.
7. Clean the front glass enclosure only when
necessary. Wipe surface with clean, dampened,
soft cloth. Follow with dry, soft towel as desired.
Take care not to scratch the glass surface.
Inlet Pressure Port
OUT IN
Piezo Igniter
Main Gas
Control Knob
Optional Burner ON/OFF Rocker Switch Location
(One of Two Places)
SIT Millivolt Gas Valve
Do not use abrasive cleaners. Never
clean the glass when it is hot.
Do not attempt to touch the front
enclosure glass with your hands
while the fi replace is in use.
Outside Combustion Air Controls
Many appliances are equipped, when installed,
with an outside (make-up air) vent system that
is designed to provide the appliance with outside
make-up air for combustion when in operation.
The combustion air control lever for the outside
air system is standard on all appliances but
should not be operated if the complete system
is not installed. Refer to Figure 4. When the
complete outside air vent system is installed,
the installer will remove the securing screw from
the combustion air control lever located on the
left side of the fi replace bottom opening.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
WARNING
CAUTION
If the securing screw has not been removed
and you have reason to believe that you have
a complete outside air system, contact your
distributor to have your appliance inspected for
the presence of the complete system. DO NOT
assume that you have this system in place.
Outside Air Control Lever
Outside Air Control Lever
Securing Screw
Air Shutter in Closed Position
Outside Air Control Lever
Outside Air Control Lever
Securing Screw Removed
Air Shutter in Open Position
Combustion Air Control Lever
and Securing Screw Location
Figure 4
5