Lennox LF25 Low Profile Compact Gas Unit Heaters

‍Cabinet:

• Constructed of pre-painted heavy gauge cold rolled steel
• Hinged, reversible door for easy access
• 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
• Hanging brackets for suspending unit are furnished for field installation
• Unit may be rotated 180 degrees (top for bottom) for ease of installation of gas, electrical and flue locations

Tubular Aluminized Steel Heat Exchanger:

• Tubular heat exchanger is constructed of aluminized steel for superior resistance to corrosion and oxidation
• Curving design of heat exchanger allows complete exposure of heating surfaces to supply air stream
• Dimpled tubes with wrinkle bends allow 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 burners provide 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

Gas Control Valve:

• 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

Combustion Air Inducer:

• Prepurges heat exchanger and 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 and protects heating system from abnormal operating conditions

Flame Rollout Switch:

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

Controls:

• Combination Direct Spark Ignition/Fan Timer Control Ignition 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.