Description
Lennox 84L00 AUTO Limit Switch Overview
The Lennox 84L00 is an automatic-reset limit switch engineered to protect furnace heat exchangers and system components from dangerous overheating conditions. With a temperature operating range of 130–160°F, this limit switch monitors supply-air or heat exchanger temperatures and interrupts the burner circuit when temperatures exceed the safe threshold — then automatically resets once temperatures return to normal operating levels.
Key Features
- Temperature range: 130–160°F (auto-reset operation)
- Automatic reset — no manual intervention required after cool-down
- Designed as a direct OEM replacement for compatible Lennox furnace models
- Provides reliable high-limit protection to prevent heat exchanger damage and fire hazards
- Compact design for straightforward installation in existing limit switch mounting locations
How It Works
The limit switch continuously monitors the temperature within the furnace plenum or heat exchanger area. If the sensed temperature rises above the upper limit of the 130–160°F range, the switch opens the control circuit, shutting down the burner to prevent damage. Once the furnace cools to a safe level, the auto-reset mechanism closes the circuit and normal operation resumes — without requiring a manual reset by a technician.
Application
- Lennox gas furnaces requiring OEM-spec limit switch replacement
- High-limit safety control in residential and light commercial heating systems
- Ideal for HVAC service technicians performing furnace maintenance and component replacement
Why Choose the Lennox 84L00?
Using a genuine Lennox OEM limit switch ensures proper calibration and fit for your specific equipment. The 84L00 delivers the precise trip and reset points your system was designed around, maintaining safety compliance and protecting your investment in Lennox heating equipment.
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