Air Pressure Switch, CGi Boiler, 4 CGI

Weil-McLain 381-359-281 Air Pressure Switch – Precision Safety Component for Boilers

The Weil-McLain 381-359-281 Air Pressure Switch is a factory-engineered safety device designed to maintain proper operation of Weil-McLain boilers. By verifying that the correct air pressure is present before ignition, this switch helps protect the burner assembly and ensures efficient system performance under demanding field conditions.

Engineered for System Protection

This OEM air pressure switch is calibrated to shut down or prevent operation if air pressure falls outside of the specified setting. By doing so, it safeguards combustion integrity, prevents damage to boiler components, and reduces the risk of unsafe operating conditions. Its durable construction is suited for continuous duty in hydronic heating systems.

Technical Specifications

• Part Number: 381-359-281
• Type: Air Pressure Switch
• Pressure Setting: 1.40" WC (setpoint)
• Application: Select Weil-McLain boiler models
• Construction: High-strength housing with factory-calibrated diaphragm

Installation Guidance

Proper installation of the 381-359-281 Air Pressure Switch should be performed by a licensed technician. Accurate calibration and correct placement in the combustion air system are essential for reliable performance. Professional installation ensures compliance with local mechanical codes and maintains system warranty protection.

Professional Use Case

For contractors, this part provides a direct replacement solution that integrates seamlessly into Weil-McLain systems. Its precise calibration minimizes troubleshooting time and ensures the boiler operates only under correct draft and airflow conditions, helping to avoid nuisance lockouts and service callbacks.

Summary

The Weil-McLain 381-359-281 Air Pressure Switch is a critical safety component built to OEM standards. With reliable construction, accurate pressure sensing, and direct compatibility, it supports safe, efficient, and code-compliant boiler operation.