High Altitude

Lennox International Inc DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV High Altitude

The manifold pressure, gas orifice and pressure switch may require adjustment or replacement to ensure proper operation at higher altitudes. Tables 24 through 27 shows

manifold pressure, pressures switch and gas conversion kits at all altitudes.

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 24

Manifold Pressure Settings

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

				Fire	Fire	Fire	Fire	Fire	Fire


	Natural	.063	.055	1.7	3.5	1.6	3.4	1.7	3.5	4.5	13.0
070
	LP/propane3	.039	.037	4.9	10.0	4.9	10.0	4.9	10.0	11.0	13.0

	Natural	.063	.055	1.7	3.5	1.5	3.0	1.7	3.5	4.5	13.0
090
	LP/propane3	.039	.037	4.9	10.0	4.9	10.0	4.9	10.0	11.0	13.0

	Natural	.063	.055	1.7	3.5	1.5	3.2	1.7	3.5	4.5	13.0
110
	LP/propane3	.039	.037	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 25

High Altitude Pressure Switch Kits

		High Altitude
Unit		Pressure Switch Kit
Input
Input	0 − 4500 ft.	4501 − 7500 ft.	7501 − 10,000 ft.
	0 − 4500 ft.	4501 − 7500 ft.	7501 − 10,000 ft.

070	No Change	No Change	73W36

090	No Change	69W56	73W36

110	No Change	69W56	73W35

TABLE 26

Honeywell Gas Valve Conversion Kits

	High Altitude			LP/Propane
	High Altitude	Natural Gas to		to
	Natural Gas	Natural Gas to		to
	Natural Gas	LP/ Propane Kit		Natural Gas
Unit	Orifice Kit	LP/ Propane Kit		Natural Gas
Unit	Orifice Kit			Kit
Input				Kit
Input
	7501 −	0 − 7500 ft.	7501 −	0 − 7500 ft.
	10,000 ft.	0 − 7500 ft.	10,000 ft.	0 − 7500 ft.
	10,000 ft.		10,000 ft.

070	73W37	51W02	73W38	69W79

090	73W37	51W02	73W38	69W79

110	73W37	51W02	73W38	69W79

TABLE 27

White Rodgers Gas Valve Conversion Kits

	High Altitude			LP/Propane
	High Altitude	Natural Gas to		to
	Natural Gas	Natural Gas to		to
	Natural Gas	LP/ Propane Kit		Natural Gas
Unit	Orifice Kit	LP/ Propane Kit		Natural Gas
Unit	Orifice Kit			Kit
Input				Kit
Input
	7501 −	0 − 7500 ft.	7501 −	0 − 7500 ft.
	10,000 ft.	0 − 7500 ft.	10,000 ft.	0 − 7500 ft.
	10,000 ft.		10,000 ft.

070	77W05	77W07	77W11	77W09

090	77W05	77W07	77W11	77W09

110	77W05	77W07	77W11	77W09

Page 41

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.

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