The Lennox 36W91 is an OEM control limit switch engineered to protect heating equipment from dangerous overtemperature conditions. Designed as a direct factory replacement for compatible Lennox systems, this limit control monitors supply air or heat exchanger temperatures and interrupts system operation when unsafe levels are detected — then automatically resets once temperatures return to a safe range.
How It Works
The 36W91 limit switch opens the control circuit when the monitored temperature reaches the cutout setpoint, shutting down the burner or heating element to prevent equipment damage, heat exchanger failure, or fire hazard. Once the temperature drops back to the reset setpoint, the switch closes and normal operation resumes.
Temperature Specifications
- Cutout Temperature: 220°F
- Reset Temperature: 190°F
- Differential: 30°F
Key Features
- OEM Lennox replacement part — ensures proper fit and function
- Automatic reset operation for convenient, reliable protection
- Protects heat exchangers and combustion components from overtemperature damage
- Designed for use in Lennox furnaces and heating systems requiring a 220/190°F limit control
- Helps maintain system safety and extend equipment life
Application
Ideal for HVAC technicians and contractors performing service, maintenance, or repair on Lennox furnaces and heating equipment. Always verify compatibility with the specific Lennox model before installation.
