Description
Lennox 47L19 Auto Limit Switch Overview
The Lennox 47L19 is an automatic-reset high-limit switch engineered to protect furnaces and heating systems from dangerous overheating conditions. With an operating range of 160°F to 185°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 a safe level, minimizing system downtime and service calls.
Key Features
- Auto (automatic) reset operation — restores normal function once temperatures normalize
- Temperature range: 160°F – 185°F
- Designed as a direct OEM replacement for compatible Lennox heating systems
- Protects heat exchangers and furnace components from thermal damage
- Interrupts burner operation upon high-limit condition for safe shutdown
- Reliable bimetal sensing element for accurate temperature response
Application
The Lennox 47L19 limit switch is a critical safety component used in Lennox furnaces and air handlers. It is mounted in the supply-air plenum or on the heat exchanger to continuously monitor operating temperatures. In the event of restricted airflow, a dirty filter, or a blower failure, the switch opens the control circuit to shut down the burner and prevent equipment damage or fire hazard.
Why Choose the Lennox 47L19?
- OEM-specified part for precise fit and reliable performance
- Auto-reset design reduces nuisance service calls
- Helps maintain system safety and extend equipment life
- Easy drop-in replacement for qualified HVAC technicians
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