Nordyne P3RX Series User Manual And Installation Instructions page 5

Transition Duct Screws
Supply Air
Figure 3. Return and Supply Air Fittings
3. INSTALL THE RETURN AND SUPPLY AIR FITTINGS
ON THE UNIT (See Figure 3)
The supply and return fittings are shipped in the supply duct.
They attach to the unit openings with a flange and bead
arrangement, secured with two furnished screws. Note: For
ease of access, install fitting before positioning unit in final
location.
SUPPLY DUCT
Position the supply duct collar so the edge of the unit opening
fits between the flange and the bead. Overlap the collar ends
keeping the small screw holes underneath. Align the holes in
the crimped area and install one screw.
Note: It may be necessary to loosen the four screws that hold
the transition duct in order to install the supply fitting. Re-
tighten when installation is complete.
Tap collar as necessary to ensure engagement with unit
opening and install second screw. Tighten first screw. Rotate
collar clockwise so joint is near three o'clock position.
RETURN DUCT
The 12" return duct is installed in the same manner as the
supply duct. If the unit has a 14" return, follow these
instructions.
Model
P3RA-024( )
P3RA-030( )
P3RA-036( )
P3RA-042( )
P3RA-048( )
P3RA-060( )
14" Duct Dimples
Return Air
Return Dia. (in)
12
12
12
12
14
14
Figure 4. Return Air Box
Align the slots with the holes in the collar and install two
screws. Position the 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.
4. LOCATING AND INSTALLING THE RETURN AIR
ASSEMBLY (See Figure 4)
To avoid complications, locate and install the return air
assembly first. The return air box with grille and filter
(Figure 4) should not be located in heavy traffic 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 filter box through a boxed-in area at
the closet floor level. Make sure the filter 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 fiber underboard to determine how the floor 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 floor so that the box
will fit between the floor 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 fiberboard
directly under the hole in the floor. However, if the floor 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 filter and return air grille in place.
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