INSTALLATION INSTRUCTIONS Gas Furnace: WFAR
440 01 7104 02 21
Specifications subject to change without notice.
INSTALLATION
NOTICE
This furnace is certified to leak 2% or less of nominal air con-
ditioning CFM delivered when pressurized to 1-inch water
column (250 Pa) 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 Figure 25 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
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
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 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 26, Figure 27,
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.
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 Figure 26,
Figure 27, Figure 28.)
Leveling Legs (If Desired)
In upflow position with side return inlet(s), leveling legs may be
used. (See Figure 23.) 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
inside nut to secure arrangement.
5. Reinstall bottom closure panel if removed.
Downflow Installation
NOTE: The furnace must be forward as shown in Figure 25 for
proper condensate drainage.
Supply Air Connections
NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when any one of the following two
accessories are used:
S Special Base, NAHA01101SB
S Cased Coil Assembly -- WENC, WTNC, WENW,
WTNW, WLNC, WLNW, WLAM
1. Determine application being installed from Table 8.
2. Construct hole in floor per Table 8 and Figure 21.
3. Construct plenum to dimensions specified in Table 8 and
Figure 21.
4. Install special base coil assembly or coil box as shown in
Figure 21.
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 Figure 22.)
CUT HAZARD
Failure to follow this caution may result in personal
injury.
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.
CAUTION
!
Connect supply--air duct to supply--air outlet on furnace. Bend
flange inward past 90_ with wide duct pliers (See Figure 22.)
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.
To Next Page
Loading...