Description
The Lennox 49L95 is an OEM auto-reset limit switch engineered to protect furnace heat exchangers and internal components from damaging high-temperature conditions. With a temperature range of 95–125°F, this limit switch continuously monitors supply air or plenum temperatures and automatically interrupts the burner circuit when unsafe temperature thresholds are reached — then resets itself once temperatures return to a safe operating level.
Key Features
- OEM Lennox replacement limit switch — SKU 49L95
- Operating temperature range: 95–125°F
- AUTO (automatic) reset function — restores operation once temperature normalizes
- Designed to protect furnace heat exchangers from overheating
- Interrupts burner circuit upon reaching the upper limit set point
- Direct OEM replacement for compatible Lennox furnace models
Why Limit Switches Matter
Limit switches are a critical safety component in forced-air furnaces. When airflow is restricted — due to a dirty filter, blocked return, or blower failure — plenum temperatures can rise to dangerous levels. The 49L95 AUTO limit switch acts as the last line of defense, shutting down the burner before heat exchanger damage or a potential fire hazard can occur. The automatic reset design minimizes service calls by restoring normal operation once the root cause is resolved and temperatures drop back into the safe range.
Application
- Compatible with select Lennox forced-air furnace models
- Ideal for residential and light commercial heating systems
- Recommended for use as a direct OEM replacement to maintain system warranty and performance
Installation Notes
Always verify compatibility with your specific Lennox furnace model number before installation. Disconnect power to the unit before replacing any limit switch. Consult the furnace service manual for proper mounting location and wiring configuration.
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