D.
Installation of Unit Behind a Louvered Door or
Enclosed in Closet
If unit is installed behind a louvered door and louvers are directly
in front of unit’s intake grille, a 2-in. clearance is recommended
between door and front of unit. If louvers are installed in upper part
of door so they are not directly in front of intake grill, a minimum
7-in. clearance is recommended between door and front of unit.
This also applies if a solid wall is used instead of a louvered door.
Should the louver be installed somewhere other than in front of
unit (for example, to the side of unit), consult your distributor
before proceeding to obtain recommended clearances. The recom-
mended minimum return-air requirements to be used are shown in
Table 2.
IV.
PREPARE FLOOR AND BASE
A.
Install Installation Kit
Installing installation kit requires a hole through floor of home
approximately 18-1/2 in. wide by 19-1/2 in. deep to provide access
from unit to supply duct trunk and outside air.
NOTE:
The diagrams show a typical installation. The actual
method of installation will be dictated by model and manufacturer
of the home. Installer will determine the best method to use.
1. Construct a boxed-in area of framework under unit location
slightly larger than the 18-1/2-in. by 19-1/2-in. hole to
provide adequate support for unit. (See Fig. 8.)
2. Locate supply duct trunk so that it runs under front edge of
hole. Back edge of supply duct trunk should be approxi-
mately 8 in. from back of hole. (See Fig. 9.)
3. After floor section is complete; locate, mark, and cut a hole
through floor approximately 18-1/2 in. by 19-1/2 in. (See
Fig. 9.)
4. Place base template assembly over hole and mark indoor-air
plenum cutout in supply duct trunk measuring 13 in. by
9-1/8 in. (See Fig. 10.) Mark condensate drain hose and
outdoor-air plenum cutouts in insulation and vapor barrier
or drain to outside.
CAUTION:
Be careful not to crimp drain hose attached
to condensate drain cup.
CAUTION:
Failure to route drain hose where it will not
be kinked will cause drain trap to overflow, leaking water
onto floor.
5. Remove base template assembly. Reach through hole and
cut holes through vapor barrier and insulation for outdoor-
air plenum and condensate drain hose to extend through or
drain to outside. Also cut 13-in. by 9-1/8-in. hole in duct
trunk. (See Fig. 10.)
6. Bend every other tab up 90 degrees on indoor-air collar as
shown in Fig. 10.
7. Insert base template assembly into supply duct and secure it
with 4 flat-head screws, 1 in each corner. Bend remaining
tabs up 90 degrees locking indoor-air collar securely to
supply duct trunk. Use mastic or foil-type duct tape to seal
any openings. (See Fig. 10.)
TABLE 2—MINIMUM RETURN-AIR REQUIREMENTS
UNIT SIZE
NET FREE OPEN AREA (SQ IN.)
018
300
024
375
030, 036
450
Fig. 8—Typical Framework Construction
A95343
FLOOR JOIST
SUPPLY-AIR DUCT
≈
181⁄2
″
≈
191⁄2
″
Fig. 9—Dimensions of Hole
A95344
FRONT OF UNIT
18
1
⁄
2
″
19
1
⁄
2
″
2
″
TYP.
2
″
APPROX.
8
″
WALLS
FLOOR
FLOOR JOIST
FRAMING
HOME DUCT TRUNK
Fig. 10—Installation of Base Template, Indoor-Air Collar,
and Outdoor-Air Plenum
A95345
13
″
9
1
⁄
8
″
FOAM AIR SEAL
FLAT-HEAD
WOOD SCREW
BASE
TEMPLATE
DRAIN CUP
INDOOR AIR
COLLAR
OUTDOOR AIR
PLENUM
BEND
ALTERNATE
TABS
DUCT TRUNK
DRAIN HOSE
(PIPE TO OUTSIDE
OF STRUCTURE)
INDOOR AIR
CUTOUT
13
″
x 9
1
⁄
8
″
NOTE: THE DRAIN CUP, FOAM AIR SEAL, OUTDOOR-AIR
PLENUM, AND INDOOR-AIR COLLAR ARE PREASSEMBLED
AT FACTORY.
DO NOT USE
FRONT INSIDE
HOLES
—4—
