Rheem-Ruud 470018 Limit Switch

The Rheem-Ruud 470018 Limit Switch is a mission-critical OEM HVAC safety control engineered for high-precision thermal monitoring in residential and commercial air handlers and furnaces. This Normally Closed (NC) SPST switch is specifically orange color-coded for rapid field identification and features a 145°F fixed open temperature to prevent heat exchanger or blower compartment overheating. Designed with a 20°F differential, the contacts are rated to automatically reset when the local ambient temperature drops to 125°F, eliminating the need for manual intervention after a temporary temperature excursion.

Built for durability in demanding environments, this moisture-resistant limit switch is ideal for low-load induction applications requiring flanged airstream mounting. The enclosed disc face and 3/8-inch mounting insertion depth ensure consistent thermal response times and protection against debris. With 1/4-inch quick connect terminals and a 26VAC maximum rating, the 470018 limit switch provides a reliable, drop-in solution for maintaining system integrity and sequence of operation in Rheem, Ruud, and Richmond equipment.

• Precise Thermal Safety: Fixed 145°F trip point ensures HVAC high-limit protection and prevents hazardous overheating conditions.
• Automatic System Recovery: Features an auto-reset mechanism at 125°F, streamlining system uptime for the end-user.
• Environmentally Robust: Moisture-resistant construction allows for reliable performance in high-humidity plenum environments.
• Simplified Installation: Orange color-coding and flanged mounting design allow for fast replacement during service calls.
• OEM Compatibility: Genuine Rheem-Ruud replacement part ensures exact fitment and electrical specification compliance.

What does the orange color code signify on this limit switch?
The orange color coding is a specific identifier used by the manufacturer to signal the unique temperature trip and reset points (145/125) and its classification as a moisture-resistant, low-load component.

Can I use this switch in a high-voltage circuit?
No, this specific limit switch is rated for a maximum of 26VAC at 1 Amp. It is designed for low-voltage control circuits typical of HVAC safeties.

How do I verify if the 470018 has tripped?
In a normal operating state, this SPST switch should show continuity across the terminals. If the circuit is open while the equipment is cool, the switch has likely failed or reached its end of service life.

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.