Proper Combustion, High Altitude | Lennox International Inc EL280DF

Proper Combustion

Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking com- bustion. Table 12 shows acceptable combustion for ALL EL280DF models. The maximum carbon monoxide reading should not exceed 50 ppm

TABLE 12

Firing Rate	CO2% For Nat	CO2% For L.P.
High Fire	6.8 − 7.4	7.5 − 9.0

Low Fire	4.2 − 5.7	5.0 − 6.0

High Altitude

The manifold pressure may require adjustment and com- bustion air pressure switch may need replacing to ensure proper combustion at higher altitudes. Refer to table 13 for

manifold pressure and table 14 for pressure switch change and gas conversion kits.

IMPORTANT

For safety, shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to replace pressure tap plug.

TABLE 13

Manifold Pressure Settings at all Altitudes

		Manifold		Manifold		Manifold		Supply Line
Unit	Gas	Pressure in.wg.		Pressure in.wg.		Pressure in.wg.		Pressure
Unit		0−4500 ft.		4501−7500 ft.1		7501 − 10,000 ft.2		in. w.g.
Input		0−4500 ft.		4501−7500 ft.1		7501 − 10,000 ft.2		in. w.g.
Input
		Low Fire	High Fire	Low Fire	High Fire	Low Fire	High Fire	Min	Max

	Natural	1.7	3.5	1.5	3.2	1.7	3.5	4.5	13.0
070
070	LP/propane3	4.9	10.0	4.9	10.0	4.9	10.0	11.0	13.0
	LP/propane3	4.9	10.0	4.9	10.0	4.9	10.0	11.0	13.0
	Natural	1.7	3.5	1.5	3.0	1.7	3.5	4.5	13.0
090
090	LP/propane3	4.9	10.0	4.9	10.0	4.9	10.0	11.0	13.0
	LP/propane3	4.9	10.0	4.9	10.0	4.9	10.0	11.0	13.0
	Natural	1.7	3.5	1.5	3.2	1.7	3.5	4.5	13.0
110
110	LP/propane3	4.9	10.0	4.9	10.0	4.9	10.0	11.0	13.0
	LP/propane3	4.9	10.0	4.9	10.0	4.9	10.0	11.0	13.0

1This is the only permissible derate for these units.

2Natural gas high altitude orifice kit required.

3A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure.

NOTE − Units may be installed at altitudes up to 4500 ft. above sea level without modifications.

TABLE 14

Pressure Switch and Gas Conversion Kits at all Altitudes

	High Altitude Pressure Switch Kit			High Altitude	LP/Propane Gas Kit		LP/Propane to
Unit	High Altitude Pressure Switch Kit			Natural Gas Kit	LP/Propane Gas Kit		Natural Kit
Unit				Natural Gas Kit			Natural Kit
Input
Input	0 − 4500 ft.	4501 − 7500 ft.	7501 − 10,000 ft.	7501 − 10,000 ft.	0 − 7500 ft	7501 − 10,000 ft.	0 − 7500 ft.Min
	0 − 4500 ft.	4501 − 7500 ft.	7501 − 10,000 ft.	7501 − 10,000 ft.	0 − 7500 ft	7501 − 10,000 ft.	0 − 7500 ft.Min

070			73W36

090	No Change	No Change	73W36	73W37	77W07	77W11	77W09

110			73W35

NOTE − A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure.

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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.