Front

Horizontal

Back

FIGURE 12

Downflow Application

Allow for clearances to combustible materials as indi-

cated on the unit nameplate. Minimum clearances for closet or alcove installations are shown in figure 13.

Downflow Application Installation Clearances

Top

Left Side

Right Side

Bottom

Type of Vent

Type C

Type B1

Connector

 

 

 

 

 

 

 

 

Top

1 in. (25 mm)

1 in. (25 mm)

 

 

 

*Front

2−1/4 in. (57 mm)**

2−1/4in. (57 mm)

 

 

 

Back

0

0

 

 

 

Sides

0†

0

 

 

 

Vent

6 in. (152 mm)

1 in. (25 mm)

 

 

 

Floor

NC††

NC††

 

 

 

*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. ** 3−1/4 in. if single wall vent pipe is used.

†Left side requires 3 in. if a single wall vent is used on 14 −1/2 in. cab- inets, or 2 in. if a single wall vent is used on 17 − 1/2 in. cabinets. ††The furnace may be installed on a combustible wood floor if an optional additive base is installed between the furnace and the combustible floor.

WARNING

Improper installation of the furnace can result in per- sonal injury or death. Combustion and flue products must never be allowed to enter the return air system or the living space. Use screws and joint tape to seal the return air system to the furnace.

In platform installations with bottom return air, the furnace should be sealed airtight to the return air ple- num. A door must never be used as a portion of the return air duct system. The base must provide a stable support and an airtight seal to the furnace. Al- low absolutely no sagging, cracks, gaps, etc.

The return and supply air duct systems must never be connected to or from other heating devices such as a fireplace or stove, etc. Fire, explosion, carbon monoxide poisoning, personal injury and/or proper- ty damage could result.

Filters

This unit is not equipped with a filter or rack. A field−pro-

vided high−velocity filter is required for the unit to operate properly. Table 3 lists recommended filter sizes.

A filter must be in place any time the unit is operating.

 

TABLE 3

 

 

 

Cabinet Width

 

Return Air Filter Size (inches)

 

 

 

 

 

 

A (14−1/2")

 

14 x 25 x 1 (1)

B (17−1/2")

 

16 x 25 x 1 (1)

C (21")

 

20 x 25 x 1 (1)

FIGURE 13

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Lennox International Inc DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV installation instructions Filters
Page 10 Page 12

DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV specifications

Lennox International Inc has made a significant mark in the heating, ventilation, and air conditioning (HVAC) industry, known for its commitment to innovation and energy efficiency. One of its standout products is the SL280DFV model, a high-efficiency gas furnace designed to meet the needs of modern homes.

The SL280DFV boasts an impressive Annual Fuel Utilization Efficiency (AFUE) rating of up to 80%. This rating indicates that the furnace converts 80% of the fuel it consumes into usable heat, making it a cost-effective choice for homeowners. The high efficiency not only reduces energy bills but also lessens the environmental impact by minimizing greenhouse gas emissions.

One of the key features of the SL280DFV is its two-stage gas valve operation. This technology allows the furnace to operate at two levels of heating output: low stage for milder days and high stage for extremely cold temperatures. This adaptability enhances comfort by maintaining more consistent indoor temperatures while also saving energy when full power is unnecessary.

Another innovative aspect of the SL280DFV is its variable-speed blower motor. This smart technology enables the furnace to adjust airflow based on the heating needs of a home, which promotes quiet operation and improved temperature consistency throughout living spaces.

The SL280DFV is equipped with a durable heat exchanger that is designed to withstand the rigors of daily use, contributing to the unit’s longevity. Additionally, the furnace features a smart ignition system that ensures reliable start-ups, so homeowners can depend on it through the coldest winter nights.

Safety is also a priority in the design of the SL280DFV. It includes various safety features such as a built-in flame sensor and advanced venting system, designed to avert hazardous situations and ensure optimal operation.

Furthermore, Lennox offers convenient installation and maintenance support, making the SL280DFV not only an efficient heating solution but also a practical choice for homeowners. With its blend of advanced technology, high efficiency, and reliability, the Lennox SL280DFV is an appealing option for those looking to upgrade their home’s heating system, promising comfort and peace of mind for many winters to come.
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