Description
Lennox 21L89 Auto Limit Switch Overview
The Lennox 21L89 is an automatic reset limit switch designed to protect furnace and heating system components from dangerous overtemperature conditions. With a temperature operating range of 210–240°F and a 3″ insert-style mounting configuration, this OEM-quality part is engineered for reliable, precise thermal protection in Lennox heating equipment.
Key Features
- Auto (automatic) reset limit switch for convenient, hands-free recovery after a temperature fault
- Operating temperature range: 210–240°F for accurate high-limit detection
- 3″ insert mounting style for straightforward installation into compatible Lennox furnace applications
- OEM Lennox replacement part — ensures proper fit and performance
- Provides essential overheat protection to safeguard heat exchangers and other furnace components
Application
The 21L89 limit switch is a direct OEM replacement for select Lennox furnaces and heating systems. It monitors supply-air or plenum temperatures and automatically interrupts the burner circuit when temperatures exceed the rated setpoint, then resets once temperatures return to a safe level. This auto-reset functionality minimizes service calls while maintaining system safety.
Product Specifications
- Brand: Lennox
- Part Number: 21L89
- Switch Type: Auto Limit (Automatic Reset)
- Temperature Range: 210–240°F
- Mounting Style: 3″ Insert
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