Installing Return Supply AIR Fittings, Supply 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
			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

R-410A specifications

Nordyne R-410A is a widely recognized refrigerant used in modern air conditioning and heat pump systems, known for its efficiency and environmentally friendly attributes. As a hydrofluorocarbon (HFC) refrigerant, R-410A has become the preferred choice for many manufacturers seeking to meet stringent environmental regulations while providing superior cooling performance.

One of the main features of R-410A is its higher energy efficiency compared to older refrigerants like R-22. This efficiency is primarily attributed to its higher pressure capabilities, which allow for improved heat transfer and reduced energy consumption in residential and commercial systems. As energy costs continue to rise, the use of R-410A in HVAC systems offers a viable solution for reducing utility bills while maintaining optimal comfort levels.

R-410A is also non-ozone-depleting, which sets it apart from many traditional refrigerants. While older refrigerants have been phased out due to their potential harm to the ozone layer, R-410A presents a sustainable alternative that aligns with environmental goals. It features a zero ozone depletion potential (ODP), making it a responsible choice for installations concerned with ecological impact.

In terms of technology, R-410A works effectively in both air conditioning and heat pump systems, providing reliable cooling in hot conditions and heat in colder months. It is compatible with a variety of system designs and can excel in both residential and commercial applications. Moreover, the thermodynamic properties of R-410A ensure consistent and reliable performance, regardless of the external temperature fluctuations.

Another characteristic of R-410A is its ability to operate at lower temperatures, which enhances its versatility. This capability allows for the design of systems that can function efficiently in a wider range of climate conditions. As a result, HVAC technicians and contractors benefit from its reliability and performance, leading to less frequent maintenance and enhanced customer satisfaction.

Lastly, R-410A systems are equipped with advanced components that improve overall functionality. These systems often include variable-speed compressors, which optimize energy use based on cooling demand, and advanced refrigerant management technologies that ensure safe and efficient operation.

In conclusion, Nordyne R-410A stands out as a superior refrigerant due to its energy efficiency, environmental benefits, and adaptability across a range of HVAC applications. As the industry continues to innovate and shift toward sustainable solutions, R-410A remains at the forefront of refrigerant technology, ensuring homeowners and businesses alike enjoy efficient and eco-friendly cooling options.