Rheem-Ruud 47-22906-02 Limit Switch

The Rheem-Ruud 47-22906-02 Limit Switch is a critical safety component designed for high-limit temperature monitoring in residential and commercial furnaces. This manual reset limit switch features a Single Pole Single Throw (SPST) configuration with normally closed (NC) contacts that open when the temperature reaches the 190 degrees Fahrenheit fixed setpoint. A standard OEM replacement for many Rheem furnace parts, this 47-22906-02 control prevents heat exchanger damage and ensures safe operating parameters by interrupting the burner circuit during an over-temperature event. The direct-mount design facilitates rapid OEM flame rollout switch replacement or furnace high-limit repairs, providing reliable thermal protection in gas-fired heating systems. Technicians should verify HVAC high limit switch troubleshooting protocols and manifold pressure settings before manual reset to ensure the underlying cause of the limit trip is addressed.

• Precise Thermal Protection: Fixed 190°F open temperature ensures the system operates within safe furnace temperature limit bounds.
• Manual Reset Security: Requires technician intervention to restore operation, preventing furnace short cycling issues and ensuring system safety checks.
• OEM Compatibility: Engineered for seamless integration as a primary HVAC safety switch in compatible Rheem and Ruud air handlers and furnaces.
• Durable SPST Contacts: High-quality normally closed switch design provides consistent electrical continuity under standard operating loads.

What causes a 190-degree manual reset limit switch to trip?
A trip usually indicates restricted airflow due to a clogged filter, a failing blower motor, or an oversized burner. Because this is a manual reset limit switch, the system will not resume operation until the button is physically depressed.

Can I use the 47-22906-02 in other HVAC brands?
While this is a specific Rheem-Ruud replacement part, it can be used in applications requiring a 190°F NC manual reset limit, provided the mounting footprint and terminal connections align with the manufacturer's wiring diagram.

How do I test a limit switch for continuity?
Using a multimeter set to ohms, check for continuity across the terminals when the system is cool. As a normally closed (NC) switch, it should show 0 ohms until the 190°F threshold is exceeded or the internal disc is damaged.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.