Ducting System - Nordyne 13 Seer User's Manual And Installation

collar over the opening and align the four notches
in the collar with the four dimples in the panel.
Using self-drilling screws (10-16x.5) attach the
collar to the rear panel.
5. LOCATING AND INSTALLING THE RE-
TURN AIR ASSEMBLY
To avoid complications, locate and install the
return air assembly fi rst. The return air box
with grille and fi lter (Figure 4) 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. If desired, the return opening can
be located inside a closet with louvered doors
that have 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. Make sure the fi lter is
readily accessible.
After determining the location of the return air
opening, start the installation from under the
home by cutting a small hole in the fi ber under-
board to determine how the fl oor joist location
will affect cutting the opening needed for the box.
Floor joists generally are located on 16" centers,
leaving 14-3/8" between joists. After measuring
the return air box (approximately 12-1/4" x 14-
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. 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.
Set the box into the opening and fasten with
screws or nails. Put the fi lter and return air
grille in place.
6. LOCATING AND INSTALLING THE
SUPPLY DAMPER(S)
CAUTION:
When a home is not equipped with
a make-ready kit means must be
provided to prevent simultaneous
operation of the heating and cooling
units. A heat/cool thermostat is
available for this purpose.
Figure 5. Supply Damper
When installing this air conditioning
system in conjunction with a furnace,
a damper must be installed in the fur-
nace base assembly to prevent cold
air being discharged around the heat
exchanger. Damage to the heat ex-
changer and asphyxiation may occur
installed.if the d amp
if a damper is not
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.
When locating the supply damper(s), carefully
check fl oor joists and frame members that could
interfere with the installation of the damper or
fl exible duct. Ideally, the damper should be
located in the bottom of the main duct, forward
of center of the home, at least three feet from
the nearest register. The round supply opening
in the slanted side of the damper should face
the side of the home where the air conditioner
is located. To locate the center of the heat duct,
fi rst cut a small hole in the fi berboard below the
duct at the desired location. After locating the
duct center, cut a hole approximately 3/4" larger
than the damper opening in the fi berboard. Cut
a 9-1/8" x 13-1/8" hole in the duct and bend
over all tabs fl at on the inside of the heat duct.
After inserting the damper into the duct, bend
over all tabs fl at on the inside of the heat duct.
Seal the opening between the fi berboard and
damper or fl exible duct.

DUCTING SYSTEM

DUCT REQUIREMENTS
The supply duct system, including the number
and type of registers, will have much more ef-
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