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INSTALLATION
This
furnace
is certified
to leak 2% or less of nominal
air
conditioning
CFM delivered
when
pressurized
to l-in.
water
column
with all present
air inlets, including
bottom
closure
in
upflow
and horizontal
applications,
air outlets,
and plumbing
and electrical
ports sealed.
Upflow
Installation
NOTE:
The furnace must be pitched as shown in Fig. 24 for
proper condensate drainage.
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 Fig. 21. 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
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 Fig. 25, 26, and 27.
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, perform
the following:
1. Tilt or raise furnace and remove 4 screws holding bottom
plate. See Fig. 23.
2. Remove bottom plate.
3. Remove bottom closure panel.
4. Reinstall bottom plate and screws.
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.
NOTE:
Side return-air openings can be used in UPFLOW and
some HORIZONTAL
configurations.
Do not use side return-air
openings in DOWNFLOW
configuration.
See Fig. 25, 26, and 27.
Leveling Legs (If Desired)
In upflow position with side return inlet(s), leveling legs may be
used. See Fig. 22. Install field-supplied,
5/16 x 1-1/2 in. (8 x 38
mm) (max) corrosion-resistant
machine bolts, washers and nuts.
NOTE:
Bottom closure must be used when leveling legs are used.
It may be necessary to remove and reinstall bottom closure panel to
install leveling legs. To remove bottom closure panel, see Item 1 in
Bottom Return Air Inlet section in Step 1 above.
To install leveling legs:
1. Position furnace on its back. Locate and drill a hole in each
bottom corner of furnace.
2. For each leg, install nut on bolt and then install bolt with
nut in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (Install flat
washer if desired.)
4. Adjust outside nut to provide desired height, and tighten in-
side nut to secure arrangement.
5. Reinstall bottom closure panel if removed.
Downflow
Installation
NOTE:
The furnace must be pitched as shown in Fig. 24 for
proper condensate drainage.
NOTE:
DOWNFLOW
INSTALLATION
IS NOT ALLOWED
FOR 140,000 MODEL.
Supply
Air Connections
NOTE:
For downflow applications, this furnace is approved for
use on combustible
flooring when any one of the following 3
accessories are used:
• Special Base, KGASB
• Cased Coil Assembly Part No. CNPV, CNRV, CAP, or CAR
• Coil Box Part No. KCAKC
1. Determine application being installed from Table 8.
2. Construct hole in floor per Table 8 and Fig. 20.
3. Construct plenum to dimensions
specified in Table 8 and
Fig. 20.
4. Install special base coil assembly or coil box as shown in
Fig. 20.
NOTE:
It is recommended
that the perforated supply-air
duct
flanges be completely removed from furnace when installing the
furnace on a factory-supplied
cased coil or coil box. To remove the
supply-air
duct flange, use wide duct pliers or hand seamers to
bend flange back and forth until it breaks off. Be careful of sharp
edges. See Fig. 21.
CUT HAZARD
Failure to follow this caution may result in personal iniury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.
Connect supply-air
duct to supply-air
outlet on furnace. Bend
flange inward past 90 ° with wide duct pliers
See Fig. 21. The
supply-air
duct must be connected to ONLY the furnace supply
outlet or air conditioning
coil casing (when used). When installed
on combustible
material, supply-air
duct must be connected to
ONLY
the
factory-approved
accessory
subbase,
or
a
factory-approved
air conditioning coil casing. DO NOT cut main
furnace casing to attach supply side air duct, humidifier, or other
accessories. All supply-side
accessories MUST be connected to
duct external to furnace casing.
19
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