Description
The Rheem-Ruud 47-100902-02 is an OEM auto-reset (A/R) low limit switch engineered to provide reliable freeze protection in Rheem and Ruud HVAC systems. Designed to monitor air or coil temperatures in air handling units, this switch automatically opens the circuit when temperatures drop to the 15°F setpoint, safeguarding heat exchangers, coils, and connected equipment from freeze damage. Once conditions recover, the switch automatically resets and closes at 40°F, restoring normal system operation without manual intervention.
This direct OEM replacement ensures compatibility and performance integrity for Rheem and Ruud equipment, making it the preferred choice for service technicians and HVAC contractors performing warranty or out-of-warranty repairs.
Key Features
- Auto-reset (A/R) operation — no manual reset required after temperature recovery
- Opens at 15°F to protect against freeze conditions
- Closes at 40°F to restore normal system operation
- OEM Rheem-Ruud replacement part for assured fit and function
- Designed for use in air handling and forced-air HVAC applications
- Helps prevent costly coil and heat exchanger freeze damage
Specifications
- SKU: 47-100902-02
- Brand: Rheem-Ruud
- Switch Type: Auto-Reset Low Limit
- Open Setpoint: 15°F
- Close Setpoint: 40°F
- Application: Rheem / Ruud HVAC air handling systems
Application
This low limit switch is a critical safety component in forced-air heating and cooling systems. It is typically installed in the air stream of an air handler or furnace to detect dangerously low temperatures that could indicate a freeze risk. When the sensed temperature falls to 15°F, the switch opens to shut down the system or trigger an alarm, preventing damage. The auto-reset design means the switch will close again at 40°F once safe operating temperatures are restored, minimizing downtime and eliminating the need for a manual reset call.
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