Nordyne R-410A user manual Installing Return And Supply Air Fittings, Supply Duct, Return Duct

INSTALLING RETURN AND

SUPPLY AIR FITTINGS

The supply and return fi ttings are included with the unit and located in the supply duct. They attach to the unit openings (Figure 4) with a

flange and bead arrangement and may be, secured with two sheet metal screws. Note: For easier access, install fi ttings before positioning unit in fi nal location.

Supply Duct

1.Position the supply duct collar so the edge of the unit opening fi ts between the fl ange and the bead.

2.Overlap the collar ends keeping the small screw holes underneath.

3.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 fi tting. Re-tighten when installation is complete.

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.

Transition
Duct Screws		14”	Duct Dimples
Supply Air	Return Air

Figure 4. Return and Supply Air Fittings

LOCATING AND 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.Make sure the filter is readily accessible.

NOTE: The return air box with grille and fi lter (Figure 5) 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.

3.Set the box into the opening and fasten with screws or nails.

4.Put the fi lter and return air grille in place.

Figure 5. Return Air Box

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