Lochinvar & A.O. Smith 100166230 Pressure Switch

The Lochinvar & A.O. Smith 100166230 Pressure Switch is a critical safety component designed for precise low air pressure monitoring in commercial and residential heating systems. Calibrated to a fixed set point of 1.35" WC, this switch ensures that your EB or EW water heater or boiler maintains proper venting and airflow before allowing the ignition sequence to proceed. As a veteran-grade OEM replacement part, this SPDT pressure switch (Single-Pole Double-Throw) offers versatile wiring configurations to meet specific factory schematics, effectively replacing discontinued or legacy part numbers including PRS30010 and PRS2421. The robust Cleveland Controls NS2-0221-00 design provides the mechanical reliability required for high-cycle environments, preventing hazardous operation during pressure fluctuations or flue blockages. For technicians servicing Lochinvar boilers, this switch is the industry standard for maintaining system integrity and operational safety.

Key Benefits for Professionals

• Direct OEM Compatibility: Engineered as an exact functional match for PRS30010, ensuring zero-gap installation on A.O. Smith and Lochinvar EB/EW units.
• Precise Safety Trip Point: Fixed 1.35" WC (water column) rating provides reliable protection against insufficient combustion air or venting failures.
• Industrial-Grade Contacts: The SPDT contact configuration supports both normally open and normally closed circuits for diverse control logic applications.
• Optimized System Performance: Eliminates intermittent "no-fire" codes caused by drifting tolerances in older, fatigued diaphragm switches.

Common Questions

Is the 100166230 interchangeable with the PRS30010?
Yes, these parts are identical in performance and technical specifications. The 100166230 is the current manufacturer part number used by Lochinvar and A.O. Smith to replace the legacy PRS30010 and PRS2421 switches.

What are the symptoms of a failing pressure switch in an EB/EW boiler?
Standard indicators include the inducer motor running without the burner igniting, or the system throwing specific airflow fault codes. If the mechanical diaphragm or electrical contacts fail, the 1.35" WC threshold will not be met, preventing the ignition control from energizing the gas valve.

Can this switch be used in positive or negative pressure applications?
This low air pressure switch is typically utilized to sense negative pressure (vacuum) generated by the draft inducer, but its SPDT nature and dual-port design allow it to monitor differential pressure across the combustion circuit.

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.