Description
The Armstrong Furnace R40154B004 is a genuine OEM automatic reset limit switch engineered to protect your furnace from dangerous overheating conditions. Designed as a direct replacement for compatible Armstrong Furnace systems, this limit switch monitors heat exchanger temperatures and automatically interrupts burner operation when temperatures exceed the rated threshold — then resets automatically once safe operating temperatures are restored.
Key Features
- Automatic (AUTO) reset operation — restores normal furnace function once temperatures return to safe levels
- Temperature range: 140°F to 170°F — precise cutout protection for compatible Armstrong furnace applications
- Genuine OEM replacement part for Armstrong Furnace systems
- Helps prevent heat exchanger damage, equipment failure, and potential fire hazards
- Direct drop-in replacement for fast, reliable service calls
Application
This limit switch is a critical safety component in Armstrong Furnace heating systems. It continuously monitors supply air or heat exchanger temperatures and cuts power to the burner if temperatures rise above the rated setpoint. The automatic reset feature means the furnace can resume normal operation once the overheat condition is resolved — no manual intervention required.
Specifications
- SKU / Part Number: R40154B004
- Brand: Armstrong Furnace
- Type: Automatic (AUTO) Reset Limit Switch
- Temperature Range: 140°F – 170°F
- Application: Armstrong Furnace heating systems
Why Choose a Genuine OEM Limit Switch?
Using a genuine Armstrong Furnace replacement limit switch ensures proper fit, accurate temperature calibration, and reliable safety performance. Aftermarket substitutes may not meet the original equipment specifications, potentially compromising system safety and warranty coverage.
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