Downflow Installation

Downflow unit installs in three ways: on non−combustible flooring, on combustible flooring using a downflow com- bustible flooring base, or on a reverse−flow cooling cabinet. Do not drag the unit across the floor.

Installation on Non−Combustible Flooring (Figure 6)

1 − Cut floor opening keeping in mind clearances listed on unit rating plate. Also keep in mind gas supply connec- tions, electrical supply, flue and air intake connections and sufficient installation and servicing clearances. See table 1 for correct floor opening size.

2 − Flange warm air plenum and lower the plenum into the opening.

3 − Set the unit over the plenum and seal the plenum to the unit.

4 − Ensure that the seal is adequate.

EL280DF UNIT
OPENING	SUPPLY AIR
OPENING	PLENUM

FIGURE 6

TABLE 1

NON−COMBUSTIBLE FLOOR OPENING SIZE

	Front to Rear		Side to Side
Cabinet Width
Cabinet Width	in.	mm	in.	mm
	in.	mm	in.	mm


A (14.5")	19−3/4	502	13−1/4	337

B (17.5")	19−3/4	502	16−1/4	413

C (21")	19−3/4	502	19−3/4	502

NOTE − Floor opening dimensions listed are 1/4 inch (6 mm) larger than the unit opening. See unit dimensions on page 2.

Installation on Combustible Flooring (Figure 7)

1 − When unit is installed on a combustible floor, a down- flow combustible flooring base must be installed be- tween the furnace and the floor. The base must be or- dered separately.

See table 2 for opening size to cut in floor.

CAUTION

The furnace and downflow combustible flooring base shall not be installed directly on carpeting, tile, or other combustible material other than wood floor- ing.

	EL280DF UNIT
		SUPPLY AIR PLENUM
	PROPERLY	DOWNFLOW
	PROPERLY	COMBUSTIBLE
	SIZED FLOOR	COMBUSTIBLE
	SIZED FLOOR	FLOORING BASE
	OPENING	FLOORING BASE
	OPENING

FIGURE 7

TABLE 2

COMBUSTIBLE FLOOR OPENING SIZE

	Front to Rear		Side to Side
Cabinet Width
Cabinet Width	in.	mm	in.	mm
	in.	mm	in.	mm


A (14.5")	22	559	15−3/4	400

B (17.5")	22	559	18−3/4	476

C (21")	22	559	22−3/4	578

2 − After opening is cut, set combustible flooring base into opening.

3 − Check sealing strips on combustible flooring base to make sure they are properly glued and positioned.

4 − Lower supply air plenum into downflow combustible flooring base until plenum flanges seal against the strips.

NOTE − Be careful not to damage sealing strips. Check for a tight seal.

5 − Set the furnace over the plenum.

6 − Ensure that the seal between the furnace and plenum is adequate.

Installation on Cooling Cabinet (Figure 8)

1 − Refer to reverse−flow coil installation instructions for correctly sized opening in floor and installation of cabi- net.

NOTE − Downflow combustible flooring kit is not used

2 − When cooling cabinet is in place, set and secure the furnace according to the instructions that are provided with the cooling coil. Secure the furnace to the cabinet.

3 − Seal the cabinet and check for air leaks.

Page 8

EL280DF specifications

Lennox International Inc. has been a leader in the HVAC (Heating, Ventilation, and Air Conditioning) industry for decades, consistently delivering high-quality and energy-efficient products. Among their lineup, the Lennox EL280DF Gas Furnace stands out as an excellent option for homeowners seeking reliable heating solutions.

The EL280DF is a two-stage gas furnace that offers improved efficiency and comfort, making it an ideal choice for moderate climates. One of the main features of the EL280DF is its energy efficiency, boasting an AFUE (Annual Fuel Utilization Efficiency) rating of up to 80%. This means that a significant portion of the fuel consumed is converted into heating energy, resulting in lower energy bills and reduced environmental impact.

Another noteworthy characteristic of the EL280DF is its quiet operation. Equipped with advanced sound-dampening technologies, the furnace operates with minimal noise, ensuring that your home remains a serene environment. This is especially important during the colder months when the furnace is often in frequent use.

The EL280DF also employs a two-stage heating system, which allows it to operate at a lower capacity during milder temperatures and ramp up to full capacity during the coldest days. This feature not only enhances comfort by maintaining a more consistent temperature but also contributes to energy savings by reducing unnecessary energy consumption.

In terms of installation, the EL280DF is designed for flexibility. It can be configured for various types of homes and installations, making it suitable for both new constructions and system replacements. Its compact size allows it to fit in tight spaces, providing versatility in home design.

Moreover, the EL280DF is equipped with a durable heat exchanger that ensures longevity and reliability. Lennox has also included features like a self-diagnostic control board, making troubleshooting easier and enhancing the overall reliability of the system.

In conclusion, the Lennox EL280DF Gas Furnace is a remarkable combination of efficiency, quiet operation, and versatility. With its two-stage heating capabilities and advanced technologies, it stands as a solid choice for homeowners looking to invest in a durable and energy-efficient heating solution. Whether building a new home or upgrading an old system, the EL280DF promises comfort and reliability during the coldest months of the year.