- Single Stage Heating – LS25-125 through LS25-200
- Two-Stage Heating – LS25-250 through LS25-400
- Steady-state heating efficiencies – 82.0%
- Ideal for economical commercial heating systems
- Shipped completely assembled with controls factory installed and wired
- Factory to ensure proper operation and dependability
- Units may be vented horizontally or vertically
NOTE: Installer must locate unit and combustion air intake box, make unit gas supply, combustion air, flue, electrical connections and mount thermostat to complete job.
HEATING SYSTEM
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 inlet or 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
Optional Accessories
Natural Gas to LPG/Propane Conversion Kit
- Required for field changeover from natural gas to LPG/Propane
- NOTE: See Optional Accessories – Gas Heat for proper kit selection at different elevations.
High Altitude Conversion Kit – Natural Gas
- Required on all units for proper unit operation at altitudes from 4001 to 10,000 ft. (US) and 6501 to 9500 ft. (Canada)
High Altitude Pressure Switch Kit
- Required for proper unit operation at various elevations
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