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Lennox LS25-250S-1, Separated Combustion Commercial Gas Unit Heater, 250000 Btuh, Stainless Steel Heat Exchanger, 2 Fans, 115VAC

Cat # : 20U19

Model/Part # : LS25-250S-1

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Brand
Lennox
Catalog Number
20U19
Model/Part Number
LS25-250S-1
Minimum Order Quantity
0.0
Base Unit of Measure
Unit(S)
Product Depth
46 Inches
Product Height
35.25 Inches
Product Width
45 Inches
Product Voltage
115v 1ph 60 hz
Gross Weight
306 LB
Family
LS25
Heating Capacity
250, 000 Btuh
Efficiency
83.0 AFUE
Family
LS25
Product Voltage
115 VAC 1 Ph 60 Hz
Heating Capacity
250000 Btuh
Efficiency
82%
Product Depth
46 IN
Product Width
37.625 IN
Product Height
35.25 IN
Gross Weight
326 Lbs.
Type
Separated Combustion Commercial Gas Unit Heater
CFM
4000 CFM
Heat Exchanger Type
Stainless Steel

Product Overview

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

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