Lennox LS25-175S-1​, Separated Combustion Commercial Gas Unit Heater, 175000 Btuh, Stainless Steel Heat Exchanger, 1 Fan, 115VAC

Lennox LS25-125-400 Separated Combustion Commercial Gas Unit Heaters

Tubular Aluminized or Stainless Steel Heat Exchanger:

• Tubular heat exchanger is constructed of aluminized or stainless steel for superior resistance to corrosion and oxidation
• Curved design allows complete exposure of heating surfaces to supply air stream
• Dimpled tubes for maximum heat transfer
• Compact design reduces space requirements in unit cabinet
• Heat exchanger has been laboratory life cycle tested

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

Single-Stage Gas Control Valve (LS25-125-200 models):

• 24 volt redundant combination gas control valve
• Combines manual shut off switch (On-Off), automatic electric valve (dual) and gas pressure regulation into a compact combination control

Two-Stage Gas Control Valve (LS25-250-400 models):

• 24 volt redundant combination two-stage gas control valve
• Combines manual shut off switch (On-Off), automatic electric valve (dual) and gas pressure regulation into a compact combination control

Separated Combustion:

• Combustion air is separate from the air in the heated space
• Using outside air for combustion prevents dirt, lint, dust and other contaminants in the heated space from entering the combustion area of the unit heater
• Sealed combustion air and burner compartments for optimum performance and reliability
• Combustion air intake box may be rotated 180° to facilitate top or bottom combustion air piping installations

Combustion Air Inducer:

• Prepurges heat exchanger
• Safely vents combustion products
• Operates only during heating cycle
• Blower motor has ball bearings and is thermally protected

Pressure Switch:

• Pressure switch prevents unit operation in case of blocked flue outlet

Limit Control(s):

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

Flame Rollout Switch:

• Automatic reset switch is factory installed on front of the burner box

Controls:

• Combination Direct Spark Ignition/Fan Timer Control
• Electronic direct spark ignition control provides positive and safe main burner ignition
• Spark is intermittent and occurs only when required
• Separate electronic flame sensor control assures safe and reliable operation
• Should loss of flame occur, flame sensor controls will initiate 5 attempts at re-ignition before locking out unit operation
• Control board contains all necessary controls and relays to operate unit
• Includes: Fan timer control - fan on 30 seconds (fixed), fan off 150 seconds (fixed), terminal strip for thermostat connections, diagnostic LED for troubleshooting
• Direct plug-in wiring harness
• Transformer: 120V/24V transformer furnished as standard

Direct Drive Fan(s):

• All models are equipped with efficient and quiet operating direct drive fan(s)
• LS25-125 through LS25-200 models have a single fan
• LS25-250 through LS25-400 models have two fans

Cabinet:

• Constructed of pre-painted steel
• Cabinet is ribbed for improved sound reduction
• Fan orifice opening is punched for improved airflow and sound performance
• Adjustable louvers are furnished on cabinet for control of air flow direction
• Wiring junction box is conveniently located outside unit cabinet for easy field wiring connections