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4. Tap collar (if necessary) to ensure engagement with
unit opening and install second screw.
5. Tighten fi rst screw and rotate collar clockwise so joint
is near three o'clock position.
Return Duct
1. Align the slots with the holes in the collar and install
two screws.
2. Position the collar over the opening and align the four
notches in the collar with the four dimples in the panel.
3. Using self-drilling screws (10-16x.5) attach the collar
to the rear panel.
Supply Air
Return Air
Figure 5. Return and Supply Air Fittings
Locating & Installing the Return Air Assembly
To simplify installation, locate and install the return air
assembly fi rst. If desired, the return opening can be located
inside a closet with louvered doors that has an open area
equal to or greater than the 12" x 20" grille furnished.
The return air grille can be placed in the wall of a closet
and the air ducted into the fi lter box through a boxed-in
area at the closet fl oor level (Figure 6). Verify the fi lter
is readily accessible.
NOTE: The return air box with grille and fi lter should not
be located in heavy traffi c areas like hallways or center
of rooms. A good spot is in a corner or under a table, if a
minimum two inch clearance is available.
1. Start the installation from under the home by cutting a
small hole in the subfl oor. Determine how the fl oor joist
location will affect cutting the opening needed for the
return air box. NOTE: Floor joists are generally located
on 16" centers, leaving 14-3/8" between joists.
2. After measuring the return air box (approximately 12-
1/4" x 20-1/4"), cut the hole through the fl oor so that
the box will fi t between the fl oor joists. Care should be
taken when cutting through carpeting to avoid snags.
NOTE: In most installations it will be necessary to cut a
similar hole in the fi berboard directly under the hole in
the fl oor. However, if the fl oor is more than ten inches
deep, it will only be necessary to cut a hole for the collar
on the return air box or for the insulated duct.
Figure 6. Return Air Box
3. Set the box into the opening and fasten with screws or
nails.
4. Install the fi lter and return air grille in the air box.
Connecting the Return and Supply Air Flexible Ducts
• The return duct for all units is 14" diameter.
• The supply duct for all units is 12" diameter.
• Flexible ducts can be connected to the corresponding
fi ttings with the clamps provided with the ducts. See
Table 5, page 13). Note: To prevent a loss in cooling
capacity, make sure all connections are tight.
• The fl exible ducts may be cut to the required length,
see instructions packed with duct. Keep all ducts as
short and straight as possible. Avoid sharp bends.
• Ducts may be spliced with sheet metal sleeves and
clamps.
• After the inner duct is connected to the proper fi tting,
the insulation and plastic sleeve should be pulled over
the connection and clamped.
• Homes with multiple supply ducts (or special
applications), a Y fi tting is available to divide the
supply air so it can be ducted to different areas of the
home for more effi cient cooling. Note: For maximum
performance, insulate the Y fi tting.
Locating & Installing the Supply Damper(s)
CAUTION:
If installing this air conditioning system in
conjunction with a furnace, a damper must
be installed in the furnace base assembly
to prevent cold air from being discharged
around the heat exchanger. Damage to the
heat exchanger and asphyxiation may occur if
a damper is not installed.
Check with the furnace manufacturer for damper
requirements. Failure to install the required
furnace damper may invalidate code agency
listing and limited warranty on the furnace.
7
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