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Fig. 10—Leveling Legs
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 2 screws holding bottom filler
panel. (See Fig. 9.)
2. Rotate bottom filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
HORIZONTAL INSTALLATION
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FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in dangerous
operation, serious injury, death or property damage.
Do not install the furnace on its back or hang furnace with
control compartment facing downward. Safety control opera-
tion will be adversely affected. Never connect return-air ducts
to the back of the furnace.
The furnace can be installed horizontally in an attic or crawl space
on either the left-hand (LH) or right-hand (RH) side. The furnace
can be hung from floor joists, rafters or trusses or installed on a
non-combustible platform, blocks, bricks or pad.
Suspended Furnace Support
The furnace may be supported under each end with threaded rod,
angle iron or metal plumber's strap as shown. (See Fig. 15 and 16.)
Secure angle iron to bottom of furnace as shown. Heavy-gauge
sheet metal straps (plumber's straps) may be used to suspend the
furnace from each bottom corner. To prevent screws from pulling
out, use 2 #8 x ¾-in. screws into the side and 2 #8 x ¾-in. screws
in the bottom of the furnace casing for each strap. (See Fig. 15 and
16.)
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If the screws are attached to ONLY the furnace sides and not the
bottom, the straps must be vertical against the furnace sides and
not pull away from the furnace sides, so that the strap attachment
screws are not in tension (are loaded in shear) for reliable support.
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Platform Furnace Support
Construct working platform at location where all required furnace
clearances are met. (See Fig. 2 and 17.) For furnaces with 1-in.
clearance requirement on side, set furnace on non-combustible
blocks, bricks or angle iron. For crawlspace installations, if the
furnace is not suspended from the floor joists, the ground under-
neath furnace must be level and the furnace set on blocks or bricks.
Roll-Out Protection
Provide a minimum 17-3/4" X 22" piece of sheet metal for flame
roll-out protection in front of burner area for furnaces closer than
12 inches above the combustible deck or suspended furnaces
closer than 12-in. to joists. The sheet metal MUST extend
underneath the furnace casing by 1 in. with the door removed.
The bottom closure panel on furnaces of widths 17-1/2 in. and
larger may be used for flame roll-out protection when bottom of
furnace is used for return air connection. See Fig. 17 for proper
orientation of roll-out shield.
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return-air opening. Remove and discard this panel when
A02071
bottom return air is used. To remove bottom closure panel,
perform the following:
1. Tilt or raise furnace and remove 2 screws holding bottom filler
panel. (See Fig. 9.)
2. Rotate bottom filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel 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 side
return air inlet(s) is used without a bottom return air linlet.
Not all horizontal furnaces are approved for side return air
connections (See Fig. 20.)
FILTER ARRANGEMENT
FIRE, CARBON MONOXIDE AND POISONING
HAZARD
Failure to follow this warning could result in fire, personal
injury, or death.
Never operate a furnace without a filter or with filter access
door removed.
There are no provisions for an internal filter rack in these furnaces.
A field-supplied accessory external filter rack is required.
This furnace requires KGAFR0301ALL 1" external filter rack or a
suitable field-supplied substitute, such as the Media Cabinet.
Refer to the instructions supplied with external filter rack for
assembly and installation options.
AIR DUCTS
General Requirements
The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA) or
American Society of Heating, Refrigerating and Air Conditioning
Engineers (ASHRAE) or consult The Air Systems Design Guide-
lines reference tables available from your local distributor. The
duct system should be sized to handle the required system design
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