Outside Combustion Air Control - Lennox Hearth Products LENNOX MPB3328CNE Homeowner's Care And Operation Instructions Manual

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.
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
WARNING
Do not operate the shutoff lever
unless a complete outside combus-
tion air system has been installed
with your appliance.
To open the outside air shutter, open the bottom
control access panel, reach into control com-
partment and pull the combustion air control
lever all the way out. The outside air shutter
should be fully open when the fi replace is in
use and completely closed when the fi replace
is not being used. Closing it when not in use
will prevent outside cold air from entering the
dwelling.
Step 13. Spillage Test and Safety Limit
Switch Operation
Spillage Test
After appliance installation, perform this spill-
age test to verify that proper venting conditions
exist:
1 - Place unit in its normally-operated condi-
tion, that is, with the glass enclosure panel
in place.
2 - Close all doors and windows in the room.
Turn on all exhaust fans in the house.
3 - Light the appliance.
4 - Wait 15 minutes.
5 - To check for venting action, start by holding
a smoke producing device within an inch
of one edge (side edge, not top or bottom
edge) of the glass enclosure panel. The
smoke should be drawn toward the edge
of the glass enclosure panel. Continue the
test by moving the smoke producing device
along the entire length of both side-edges
of the glass door.
6 - If the smoke is not drawn towards the
edges of the glass door turn off the
appliance and call a qualifi ed service
technican.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Manually-Reset Safety Limit Switch
This appliance is equipped with a manually-reset
blocked fl ue safety limit switch. Refer to Figure
5 on Page 7 for its location. If, during appliance
operation, the fl ame goes out (independently of
the burner on/off wall switch), it may be due to
the operation of this safety limit switch. First
allow the appliance to cool. Remove top louver
panel. Then reset the safety limit switch by
pushing the red reset button, located between
the wire terminals, on the back of the switch.
See Detail A of Figure 5 for location.
The appliance should then relight and remain
lit. Reinstall top louver panel. If the appliance
does not relight, turn off the appliance and call
for a qualifi ed service technician.
To replace the blocked fl ue safety limit
switch refer to Figure 5 on Page 7 (Details
B and C):
NOTE - This procedure should only be performed
by a qualifi ed service technician.
Important - Turn electrical power off before
beginning this procedure.
1 - Lower the bottom control compartment
access panel. Remove the glass enclosure
panel: open the latch (located in the center
of the unit front opening, under the fi rebox
fl oor) securing the glass enclosure panel.
Remove the panel by tilting it outward at
the bottom and lifting it up. Set the door
aside protecting it from inadvertent dam-
age. See Figure 6 on Page 7.
2 - Remove the lintel securing screws (3) and
then remove the lintel. One of the lintel
cabinet top holes is shown in Figure 5
(Detail B).
3 - Remove the scoop securing screws (3)
and then remove the scoop. See Figure
5 (Detail B).
4 - Remove the safety switch bracket securing
screws (2), and pull the switch/bracket
assembly, with low voltage wires attached,
through the side panel slot into the fi rebox.
See Figure 5 (Detail C).
5 - Replace the switch.
6 - Reinstall the switch/bracket assembly.
7 - Reinstall the scoop and lintel.
8 - Reinstall the glass enclosure panel.
9 - Raise the bottom control compartment
access panel.
10 - The appliance should then relight and
remain lit. If this does not occur, check
unit for a blocked fl ue condition.
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