INSTALLATION INSTRUCTIONS Gas Furnace: WFAR
22 440 01 7104 02
Specifications subject to change without notice.
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.
!
WARNING
The return--air duct must be connected to return--air opening
(bottom inlet). DO NOT cut into casing sides (left or right).
Bypass humidifier connections should be made at ductwork or
coil casing sides exterior to furnace. (See Figure 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 Figure 24.)
2. Remove bottom plate.
3. Remove bottom closure panel.
4. Reinstall bottom plate and screws.
Horizontal Installation
NOTE: The furnace must be pitched forward as shown in
Figure 25 for proper condensate drainage.
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
Do not install the furnace on its back or hang
furnace with control compartment facing downward.
Safety control operation will be adversely affected.
Never connect return--air ducts to the back of the
furnace.
!
WARNING
MINOR PROPERTY HAZARD
Failure to follow this caution may result in minor
property damage.
Local codes may require a drain pan under entire
furnace and condensate trap when a condensing
furnace is used in an attic application or over a
finished ceiling.
CAUTION
!
The furnace can be installed horizontally in an attic or
crawlspace 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.
Platform Furnace Support
Construct working platform at location where all required
furnace clearances are met. (See Table 2 and Figure 29.) For
furnaces with 1--in. (25 mm) 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 underneath furnace must be level
and the furnace set on blocks or bricks.
Suspended Furnace Support
The furnace must be supported under the entire length of the
furnace with threaded rod and angle iron. (See Figure 30.)
Secure angle iron to bottom of furnace as shown.
Roll--Out Protection
Provide a minimum 12--in. x 22--in. (305 x 559 mm) piece of
sheet metal for flame roll--out protection in front of burner area
for furnaces closer than 12--in. (305 mm) above the
combustible deck or suspended furnaces closer than 12--in.
(305 mm) to joists. The sheet metal MUST extend underneath
the furnace casing by 1--in. (25 mm) with the door removed.
The bottom closure panel on furnaces of widths 17--1/2--in.
(445 mm) and larger may be used for flame roll--out protection
when bottom of furnace is used for return air connection. See
Figure 29 for proper orientation of roll--out shield.
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 22.) 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
The return--air duct may be connected to bottom of the furnace.
The side of casing that faces downward may also be used for
return air connection. A combination of the bottom and
downward facing side may also be used. The upward facing
side of the casing cannot be used as a return air connection.
(See Figure 28.)
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 Figure 24.)
2. Remove bottom plate.
3. Remove bottom closure panel.
4. Reinstall bottom plate and screws.
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