Lennox LD24-75A, Gas-Fired Duct Furnace, Aluminized Steel Heat Exchanger, 115 VAC

Cat # : 32K54

Model/Part # : LD24-75A


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Catalog Number
Model/Part Number
Minimum Order Quantity
Base Unit of Measure
Gross Weight
104 LB
Heating Capacity
75, 000 Btuh

Product Overview

Lennox LD24-75-300 Gas-Fired Duct Furnaces

Tubular Aluminized or Stainless Steel Heat Exchanger:

  • Tubular heat exchanger is constructed of aluminized or stainless steel for superior resistance to corrosion and oxidation
  • Round surfaces create minimum air resistance and allow air to surround all surfaces for excellent heat transfer
  • Curving design allows complete exposure of heating surfaces to supply air stream
  • Compact design reduces space requirements in unit cabinet
  • Laboratory life-cycle tested
  • Condensate drain is furnished on the burner box

Inshot Burner Assembly:

  • Aluminized steel inshot burner provides efficient trouble free operation
  • Burner venturi mixes air and gas in correct proportion for proper combustion
  • Burner assembly is removable from the unit as a single component for ease of service
  • Each burner may be removed individually

Single-Stage Gas Control Valve:

  • 24 volt redundant combination gas control valve combines a manual main shutoff valve, pressure regulation and automatic electric valve (dual) into one compact combination control

Direct Spark Ignition:

  • Electronic direct spark ignition control provides positive and safe main burner ignition
  • Occurs only when required
  • Separate electronic flame sensor control assures safe and reliable operation
  • Should loss of flame occur, flame sensor control will initiate 3 attempts at re-ignition before locking out unit operation

Pressure Switch:

  • Pressure switch proves blower operation before allowing gas valve to open
  • Combustion air inducer operates only during heating cycle

Limit Control(s):

  • Factory installed and accurately located
  • Limit control has fixed temperature setting
  • Protects heating system from abnormal operating conditions

Combustion Air Inducer:

  • Combustion air inducer prepurges heat exchanger and safely vents combustion products
  • Motor has ball bearings and is thermally protected
  • Pressure switch prevents unit operation in case of blockage of combustion air inlet or flue outlet
  • May be rotated 90° to left or right of vertical to facilitate installation (-75-100-125-150 models only)


  • Units may be vented horizontally or vertically
  • Vertical Venting - Units are approved for installation with single wall and type B-1 double wall vent pipe
  • Horizontal Venting - Units are approved for installation with single wall or with Lennox-approved stainless steel vent kits


  • 115/24V transformer
  • Blower timer
  • Limit control
  • Combination Direct Spark Ignition/Fan Timer Control
  • Control board contains all necessary controls and relays to operate unit
  • Fan timer control - fan on 45 seconds (fixed), fan off 150 seconds (fixed)
  • Terminal strip for thermostat connections
  • Diagnostic LED for troubleshooting
  • Available continuous fan operation


  • Constructed of pre-painted steel
  • Insulation keeps outer cabinet surface temperatures low
  • Wiring junction box is conveniently located on outside of cabinet for easy access
  • Box contains all electrical and safety controls
  • 3/8” x 16 rivetnuts are located on the top of cabinet for suspending unit

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