Williams P500472 Limit Switch

Maintain the operational integrity of your heating equipment with the Williams P500472 Limit Switch, a critical OEM replacement part engineered for selective gas-fired heating systems. This vent safety switch features a fixed temperature setting of 280°F (L280), functioning as a primary safeguard against flue gas spillage and overheating conditions within the venting assembly. Specifically designed for manual reset (M/R) operation, this switch requires a technician to intervene following an open-circuit event, ensuring that the root cause of the vent blockage or thermal excursion is diagnosed and corrected before system restoration.

This Williams furnace limit switch is built to exact specifications to ensure compatibility with Williams Comfort Products, maintaining the original flue safety parameters. Its compact, lightweight construction (0.05 lbs) allows for precise mounting in the vent stream where it monitors the temperature limit continuously. The L280 M/R configuration is a standard safety benchmark for preventng persistent heat damage to surrounding components and ensuring code-compliant vent monitoring.

Key Benefits:

• Precision Thermal Monitoring: L280 temperature rating triggers at 280°F to prevent hazardous flue gas buildup.
• Manual Reset Safety: The M/R feature ensures the heating cycle cannot resume until a manual inspection is performed.
• Genuine OEM Quality: Factory-specified Williams P500472 part ensures seamless fit and electrical continuity.
• System Protection: Acts as a high-limit cutout to protect internal heat exchangers and venting structures.
• Universal Williams Compatibility: Optimized for use across the Williams furnace line demanding L280 vent safety controls.

Common Questions:

What causes a Williams P500472 to trip?
Tripping is typically caused by a vent blockage, improper flue draft, or restricted combustion air. Because it is a manual reset switch, you must press the reset button after the unit has cooled and the venting issue is resolved.

Can I bypass the vent limit switch for testing?
Bypassing a safety limit switch is never recommended for operation. If the switch is open, use a multimeter to check for continuity; if it remains open at ambient temperature after a reset attempt, the component should be replaced.

Is the P500472 the same as a flame rollout switch?
While both are thermal safety switches, the P500472 is specifically calibrated for vent monitoring (L280) rather than the higher temperatures typically found at the burner manifold where flame rollout switches are located.

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.