Description
The Lennox 11G87 is an automatic reset limit switch engineered to protect Lennox heating systems from overheating conditions. Designed as a direct OEM replacement, this limit switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the safe operating threshold — then resets automatically once temperatures return to normal operating range.
Key Features
- Temperature range: 90°F – 120°F operating limit
- Automatic (AUTO) reset — restores operation once safe temperature is reached
- Direct OEM replacement for compatible Lennox furnace models
- Protects heat exchanger and system components from thermal damage
- Reliable, consistent performance in residential and light commercial heating applications
How It Works
The limit switch continuously monitors the temperature within the furnace plenum or heat exchanger area. If temperatures rise above the set point of 120°F, the switch opens the burner circuit to prevent overheating. Once the temperature drops back to the safe range (90°F), the switch automatically resets and allows normal furnace operation to resume — providing hands-free protection without requiring manual intervention.
Application
- Compatible with select Lennox gas furnaces and heating systems
- Ideal for service technicians performing OEM-quality repairs and maintenance
- Suitable for residential and light commercial HVAC installations
Product Specifications
- Brand: Lennox
- Part Number / SKU: 11G87
- Switch Type: Automatic (AUTO) Reset Limit Switch
- Temperature Range: 90°F – 120°F
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