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INSTALLATION INSTRUCTIONS
UPFLOW INSTALLATION
NOTE: The furnace must be pitched as shown in Figure 19 for
proper condensate drainage.
Figure 19
Furnace Pitch Requirements
LEVEL 0-IN. (0 MM) TO
1/2-IN. (13 MM) MAX
MIN 1/4-IN. (6 MM) TO
1/2-IN. (13 MM) MAX
UPFLOW OR
DOWNFLOW
Supply Air Connections
For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable access panel. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger can be viewed for possible
openings using light assistance or a probe can be inserted for
sampling the air stream. The cover attachment shall prevent
leaks.
Connect supply--air duct to flanges on furnace supply--air
outlet. Bend flange upward to 90_ with wide duct pliers. (See
Figure 24) The supply--air duct must be connected to ONLY
the furnace supply--outlet--air duct flanges or air conditioning
coil casing (when used). DO NOT cut main furnace casing side
to attach supply air duct, humidifier, or other accessories. All
supply--side accessories MUST be connected to duct external
to furnace main casing.
Return Air Connections
WARNING
!
FIRE HAZARD
A failure to follow this warning could cause personal
injury, death and/or property damage.
Never connect return--air ducts to the back of the
furnace. Follow instructions below.
The return--air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing. Bypass humidifier may be attached into unused return
air side of the furnace casing. (See Figure 29, Figure 30 and
Figure 31 and Figure 32)
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed
in bottom return--air opening. Remove and discard this panel
when bottom return air is used. To remove bottom closure
panel, see Figure 20 and Figure 21.
440 01 4104 07
HORIZONTAL
A11237
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed
in bottom return--air opening. This panel MUST be in place
when only side return air is used. Where required by code, seal
bottom closure to furnace with tape, mastic or other durable
sealing method.
NOTE: Side return--air openings can be used in UPFLOW and
most HORIZONTAL configurations. Do not use side return--air
openings in DOWNFLOW configuration. (See
Figure 30, Figure 31 and Figure 32)
Specifications subject to change without notice.
Figure 20
Removing Bottom Closure Panel
SCREWS (2)
Representative drawing only,
some models may vary in appearance.
1.
Lay furnace on the back or side
2.
Remove the two (2) screws that secure the bottom
closure panel to the furnace casing and remove the
panel
Removing Bottom Plate and Closure
Figure 21
Panel
SCREWS (4)
BOTTOM
PLATE
Representative drawing only,
some models may vary in appearance.
1.
Lay furnace on the back or side
2.
Remove the four (4) screws that secure the bottom
plate to the furnace casing
3.
Remove the bottom closure from the casing
4.
Re--install the bottom plate to the furnace casing and
re--install the four (4) screws
Gas Furnace: N9MSB
BOTTOM
CLOSURE
A170123
A170124
Figure 29,
21
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