Lochinvar & A.O. Smith 100166229 Pressure Switch

The Lochinvar & A.O. Smith 100166229 Pressure Switch is a critical safety and operational component designed for high-efficiency hydronic systems. This OEM replacement pressure switch is a Single-Pole Double-Throw (SPDT) device, factory-calibrated to a 1.25" WC (Water Column) set point. It serves as a direct cross-reference for the discontinued PRS30009, ensuring seamless mechanical and electrical integration without the need for field modifications. In high-demand HVACR applications, this 1.25 inch water column switch monitors air or gas pressure to prove combustion blower performance and safe venting conditions before allowing the ignition sequence to proceed.

Engineered for technical precision, the 100166229 is compatible with Lochinvar EB series and Lochinvar EW series boilers, specifically the 150 and 200 models. As an A.O. Smith pressure switch, it utilizes high-grade internal contacts to provide reliable continuity and signal feedback to the integrated control board. Field technicians should verify the specific 1.25" WC rating against the appliance data plate to ensure proper pressure differential across the heat exchanger or venting system. Using an authentic Lochinvar boiler part ensures the system maintains its original engineering specifications for safety and long-term cycling performance in commercial or residential settings.

• Direct OEM Integration: Exact physical and functional replacement for the Lochinvar PRS30009, eliminating field adaptation.
• Precise Pressure Sensing: Factory-set at 1.25" WC to ensure accurate proof of airflow and combustion safety.
• Durable SPDT Configuration: High-performance SPDT pressure switch design allows for flexible wiring to normally open or normally closed circuits.
• System Compatibility: Optimized specifically for Lochinvar EB 150/200 and EW 150/200 hydronic boiler models.
• Technical Reliability: Constructed by A.O. Smith to withstand the high-cycle demands of modern condensing boilers.

• Is the 100166229 compatible with older PRS30009 units? Yes, this part is the manufacturer-designated replacement and is technically identical to the PRS30009.
• What does a 1.25" WC rating indicate? This specifies the exact pressure (measured in water column) required to actuate the internal diaphragm and close the electrical circuit.
• Will this switch work on other Lochinvar models? While primarily designed for the EB/EW 150 and 200 series, always cross-reference your specific serial number before installation.

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.