Description
The Rheem-Ruud 47-104990-05 is an OEM replacement high-limit switch designed for use in Rheem and Ruud furnaces and heating equipment. Identified by its L160-20F designation, this limit switch is engineered to open at 160°F and automatically reset once temperatures fall back to a safe operating range, providing reliable over-temperature protection for the heat exchanger and surrounding components.
How It Works
A furnace limit switch is a critical safety control that monitors the temperature inside the furnace plenum or heat exchanger. If the temperature rises beyond the rated set point — in this case 160°F — the limit switch opens the circuit to shut down the burner, preventing damage to the heat exchanger and protecting the home from overheating hazards. Once the temperature drops to the reset point, the switch automatically closes and normal operation resumes.
Key Features
- OEM Rheem-Ruud replacement part — ensures proper fit and function
- L160-20F designation: opens (trips) at 160°F
- 20°F differential: automatically resets at approximately 140°F
- Protects furnace heat exchanger from overheating damage
- Designed for direct OEM replacement — no modifications required
- Helps maintain safe, efficient furnace operation
Application
This limit switch is a direct OEM replacement for select Rheem and Ruud gas furnaces and heating systems. Always verify compatibility with your specific unit model number before installation. Consult the equipment service manual or a qualified HVAC technician to confirm proper application.
Specifications
- Part Number: 47-104990-05
- Model Designation: L160-20F
- Trip (Open) Temperature: 160°F
- Reset Differential: 20°F (resets at approximately 140°F)
- Type: High-Limit Safety Switch
- Brand: Rheem-Ruud
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