Description
Lennox 27K79 Limit Switch Overview
The Lennox 27K79 is an OEM replacement limit switch engineered to protect furnaces and heating equipment from dangerous overheating conditions. With a precisely calibrated open setpoint of 175°F and a close (reset) setpoint of 145°F, this limit switch automatically interrupts the burner circuit when supply-air temperatures exceed safe operating thresholds — then automatically resets once temperatures return to normal.
Key Specifications
- SKU: 27K79
- Brand: Lennox (OEM)
- Type: Temperature Limit Switch
- Open (Trip) Temperature: 175°F
- Close (Reset) Temperature: 145°F
- Differential: 30°F
- Direct OEM replacement for compatible Lennox heating systems
Features & Benefits
- Automatic reset design restores normal operation once temperatures fall to the close setpoint
- Protects heat exchangers, blower assemblies, and downstream components from thermal damage
- Precise factory-calibrated setpoints ensure consistent, reliable overheat protection
- Genuine Lennox OEM part ensures proper fit and performance in compatible equipment
- Straightforward drop-in replacement minimizes installation time
Application
Designed as a direct OEM replacement for compatible Lennox furnaces and heating systems, the 27K79 limit switch is an essential safety component that monitors supply-air temperature and shuts down the burner if the heat exchanger area overheats. Ideal for HVAC technicians performing preventive maintenance, warranty repairs, or emergency service calls.
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