Burner Adjustments; Spillage Test; Manual Limit Switch; Hood Installation - Lennox Hearth Products MPB3328CNE Installation Instructions Manual

Step 12. BURNER ADJUSTMENTS
Note - The air shutter for the burner primary
air opening is factory-set. Do not adjust the
factory-set position. The factory-set position is
shown in Figure 35.
Main Burner Factory Air Shutter
Opening Setting - Inches (millimeter)
Model Natural
Gas
MPB-3328 Fully Closed
MPB-3530 Fully Closed
MPB-4035 Fully Closed
MPB-4540 Fully Closed
Figure 35
Step 13. 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 hold-
ing a smoke producing device below the
glass enclosure panel. The smoke should
be drawn into the control compartment.
Continue the test by moving the smoke
producing device along the entire length
of below the glass door.
6 - If the smoke is not drawn into the control
compartment, turn off the appliance and
call a qualifi ed service technican.
Manually-Reset Safety Limit Switch
This appliance is equipped with a manually-
reset blocked fl ue safety limit switch. Refer to
Figure 36 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 36 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 36 (Details B and C):
NOTE - This procedure should only be performed
by a qualifi ed service technician.
Important - Turn electrical power off before
Propane
beginning this procedure.
Gas
1 - Lower the bottom control compartment
3/16"
access panel. Remove the glass enclosure
(4.76 mm)
panel: open the latch (located in the center
3/16"
of the unit front opening, under the fi rebox
(4.76 mm)
fl oor) securing the glass enclosure panel.
Remove the panel by tilting it outward at
3/16"
the bottom and lifting it up. Set the door
(4.76 mm)
aside protecting it from inadvertent dam-
3/16"
age. See Figure 34 on Page 16.
(4.76 mm)
2 - Remove the lintel securing screws (3) and
then remove the lintel. One of the lintel
cabinet top holes is shown in Figure 36
(Detail B).
3 - Remove the scoop securing screws (3)
and then remove the scoop. See Figure
36 (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 36 (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.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Detail A
Lintel Securing Screw
Hole in Cabinet Top
Fire Box Top
Scoop
Scoop Securing Screws
Detail B
Lintel Securing-Screw
Fire Box Top Hole in Cabinet Top
Limit/Bracket
Securing Screws
Limit
Detail C
Blocked Flue Safety Limit Location - Inside
View of Firebox - Top/Right Side Intersection
Figure 36
Step 14. HOOD INSTALLATION
All of these appliances must have a hood
installed prior to operating on the side with
a glass enclosure panel.
On louvered face units, slide the hood into
the slots on the lower edge of the cabinet top
(see Figure 38).
Wire
Termianls
Cabinet
Corner
Back Of
Limit
Switch
Door
Frame
17