Weil McLain 510-312-135 Limit Control

The Weil-McLain 510-312-135 High Pressure Limit Control is a critical safety component designed for professional steam boiler applications, specifically engineered for the Weil-McLain EG, EGH, 80, 88, and 94 series. This heavy-duty boiler pressure limit control utilizes a Single Pole Single Throw (SPST) switch action that opens on pressure rise to prevent over-pressurization. Featuring an automatic recycle (automatic reset) function, the control ensures consistent system operation without manual intervention after a temporary pressure spike. The unit provides a precise 0-15 PSIG pressure range with a manual additive differential of 1-5 PSIG, allowing technicians to fine-tune system cut-in and cut-out points. Built with a standard 1/4" NPT bottom connection, it integrates seamlessly into existing hydronic manifolds. This OEM Weil-McLain replacement part is the industry standard for maintaining CSA-certified safety parameters in commercial and residential steam systems, serving as a direct replacement for legacy Honeywell PA404A and Pressuretrol models in Weil-McLain configurations.

• Precise Pressure Management: The 0-15 PSIG operating range provides the granular control necessary for low-pressure steam boiler efficiency.
• Automatic Reset Functionality: The automatic recycle feature eliminates nuisance service calls by resetting once system pressure returns to safe levels.
• Broad Series Compatibility: Engineered specifically for high-output Weil-McLain EG and EGH boilers, ensuring exact electrical and mechanical matching.
• Industrial-Grade Construction: Features a robust 1/4" NPT brass connection and durable SPST switch housing to withstand high-cycle environments.
• Easy Installation: Simplified 1/4 inch NPT bottom-mount design allows for rapid field replacement by specialized contractors.

Is the 510-312-135 a direct replacement for Honeywell Pressuretrols?
Yes, in many Weil-McLain steam configurations, this part serves as the factory-authorized replacement for the Honeywell PA404A-1009 and similar low-pressure controllers.

What is the difference between this and a manual reset limit?
The 510-312-135 is an automatic recycle control, meaning it will re-close the circuit once pressure drops. Manual reset models require a technician to physically press a button to resume operation after a trip.

Does this control both high and low pressure?
This specific model is a high pressure limit control designed to shut down the burner when the maximum safe system pressure is exceeded.

This item is not eligible for free shipping.

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.