Description
Lennox 49L86 Auto Limit Switch Overview
The Lennox 49L86 is an automatic reset limit switch engineered to protect furnaces and heating equipment from unsafe high-temperature conditions. With a trip point of 145°F and an auto-reset threshold of 175°F, this limit switch continuously monitors heat exchanger temperatures and interrupts the burner circuit whenever temperatures exceed the safe operating range — then automatically resets once conditions return to normal, minimizing downtime and service calls.
Key Features
- Auto-reset operation — no manual intervention required after a trip event
- Trip temperature: 145°F for reliable overheat protection
- Reset temperature: 175°F for automatic return to normal operation
- Direct OEM replacement for compatible Lennox furnace models
- Designed for accurate, consistent temperature sensing in heating applications
- Helps prevent heat exchanger damage caused by sustained high temperatures
Application
The 49L86 limit switch is a genuine Lennox OEM replacement part, making it the ideal choice for technicians servicing Lennox furnaces and air handlers. It mounts directly into the furnace plenum or heat exchanger area to monitor supply-air temperatures and protect the system from overheating conditions caused by restricted airflow, dirty filters, or blower motor failures.
Why Choose the Lennox 49L86
- Genuine Lennox OEM quality for assured fit and performance
- Auto-reset design reduces unnecessary service calls
- Protects heat exchangers and extends equipment life
- Straightforward installation for experienced HVAC technicians
