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6. Using two wrenches, separate the ground-joint union
in the gas supply piping at the furnace.
7. Remove the piping between the Gas Valve and the
ground-joint union. (If applicable).
8. Remove all screws securing the Manifold Assembly to
the Burner Box.
9. Carefully remove the burner assembly from the furnace.
DO NOT DAMAGE THE IGNITER WHILE REMOVING
THE BURNER ASSEMBLY.
10. Inspect the burners for accumulated dust or debris.
If necessary carefully clean them with a soft wire
brush and a vacuum cleaner. DO NOT DAMAGE THE
IGNITER WHILE CLEANING THE BURNER.
11. Replace all the parts in reverse order from which they
were removed.
12. Follow the lighting instructions found on the furnace
door to return the furnace to operation. Verify proper
operation after servicing.
Vent System - Check the inlet pipe (if applicable) and
outlet pipe to ensure they are not blocked by debris. Any
damaged section of vent pipe must be replaced, and
any obstruction or blockage must be removed prior to
operating the furnace.
*SL & *SM Downflow Furnaces
Model #'s
Dim. -A-
054D-24B
17 1/2
072D-24B
072D-35C
21
090D-35C
118D-45D
24 1/2
120D-45D
NOTE: Dimensions shown in inches.
FIGURES & TABLES
Dim. -B-
Dim. -C-
15 7/8
16 1/8
19 3/8
19 5/8
22 7/8
23 1/8
28
22 1/2
2 3/4
Electric
(Ø 7/8)
22 1/4
Gas (Ø 1 5/8)
25 1/2
22 1/2
Vent pipe
(Ø 3")
Cond. (Ø 1 1/16)
LEFT SIDE
Figure 31. *SL & *SM Cabinet Dimensions
Heat Exchanger & Burner Maintenance - The furnace
should operate for many years without soot buildup in the
flue passageways, however, the flue, vent system, and
burners should be inspected and cleaned (if required) by
a qualified service technician annually to ensure continued
safe operation. Pay attention to any deterioration from
corrosion or other sources.
WARNING:
Holes in the vent pipe or heat exchanger can
cause combustion products to enter the home.
Replace the vent pipe or heat exchanger if leaks
are found. Failure to prevent the circulation
of combustion products into the living space
can create potentially hazardous conditions
including carbon monoxide poisoning that
could result in personal injury or death.
Lubrication - The bearings in the blower motor and
inducer blower used in these furnaces are pre-lubricated
and sealed by the manufacturer. No further oiling of the
bearings is required for the life of the motor.
TOP VIEW
B
19
Combustion
Air
Flue
3
7 1/2
T-stat
(Ø 7/8)
A
Electric
(Ø 7/8)
Gas
(Ø 1 5/8)
FRONT VIEW
BOTTOM VIEW
C
Front
Brace
22 1/4
25
Vent pipe
(Ø 3")
22 1/2
25 3/8
Cond. (Ø 1 1/16)
RIGHT SIDE
33
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