Description
The Lennox 27K12 is an OEM auto-reset limit switch engineered to protect furnaces and heating equipment from dangerous overtemperature conditions. Featuring a 205–235°F operating range and a 3-inch insertion depth, this limit switch automatically interrupts the burner circuit when supply-air temperatures exceed the set point, then resets once temperatures return to a safe level — providing reliable, hands-free protection without the need for manual reset.
Key Features
- OEM Lennox replacement part (SKU: 27K12)
- Auto-reset operation — no manual intervention required after temperature recovery
- Operating temperature range: 205–235°F
- 3-inch insertion depth for proper placement in furnace heat exchanger or plenum
- Interrupts burner circuit on overtemperature to prevent heat exchanger damage and fire hazard
- Direct OEM replacement for compatible Lennox furnace models
Product Specifications
- Brand: Lennox
- Part Number: 27K12
- Switch Type: Auto-Reset Limit Switch
- Temperature Range: 205–235°F
- Insertion Depth: 3 inches
Application
Designed as a direct OEM replacement for Lennox furnaces, the 27K12 limit switch is a critical safety component that monitors heat exchanger and plenum temperatures. When installed correctly at the 3-inch insertion depth, it provides accurate temperature sensing and reliable circuit interruption to safeguard both the equipment and the occupants of the building. Always verify compatibility with your specific Lennox furnace model before installation.
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