Description
The Lennox 83L75 is an OEM automatic (AUTO) limit switch designed to protect furnaces and heating systems from dangerous overheating conditions. With a temperature operating range of 100–145°F, this limit switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the set point — then resets automatically once safe operating temperatures are restored.
Key Features
- OEM Lennox replacement limit switch — engineered for precise fit and reliable performance
- AUTO reset operation — automatically restores normal function once temperatures return to safe levels
- Temperature range: 100–145°F for accurate high-limit protection
- Protects heat exchangers and furnace components from thermal damage
- Direct OEM replacement for compatible Lennox furnace models
- Helps maintain system efficiency and extend equipment life
Why Limit Switches Matter
Limit switches are a critical safety component in any forced-air furnace. When airflow is restricted — due to dirty filters, blocked vents, or blower failure — heat builds up rapidly inside the heat exchanger. The Lennox 83L75 AUTO Limit Switch detects this rise in temperature and shuts down the burner before damage can occur, safeguarding both the equipment and the occupants of the building.
Application
- Compatible with select Lennox forced-air furnace models
- Suitable for residential and light commercial heating applications
- Ideal for service technicians performing OEM-quality repairs and replacements
Product Specifications
- Brand: Lennox
- SKU: 83L75
- Type: AUTO (Automatic Reset) Limit Switch
- Temperature Range: 100–145°F
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