Lochinvar & A.O. Smith 100166248 Pressure Switch

The Lochinvar & A.O. Smith 100166248 Pressure Switch is a critical safety component designed for precise combustion air proving in high-efficiency commercial boilers and water heaters. Rated at .95" WC (Water Column), this SPDT (Single Pole Double Throw) switch monitors differential pressure to ensure the blower is moving sufficient air before the ignition sequence begins. This authentic OEM replacement part is the current manufacturer-specified successor to the discontinued PRS30029 and is also a direct replacement for PRS2013 and 100166141. Built for rigorous duty cycles, it maintains system integrity by preventing operation during vent blockages or fan failures. The 100166248 is frequently utilized in the Lochinvar Copper-Fin II series, specifically compatible with CPN 1441-2071 and CPL 991-2071 models, as well as various Power-Fin and Efficiency+ systems. Field installation is streamlined with the inclusion of required tubing and hardware, ensuring a reliable diaphragm-actuated seal for accurate differential pressure sensing across both natural gas and propane configurations.

• Direct OEM Match: Fully replaces legacy part numbers PRS30029, PRS2013, and 100166141 with no modifications required.
• Precise Calibration: Factory-set at .95" WC to ensure exact safety thresholds for flue gas monitoring.
• Versatile Compatibility: Engineered for Lochinvar Copper-Fin II, Power-Fin, and A.O. Smith commercial water heaters.
• Reliable SPDT Logic: Features a Single Pole Double Throw configuration for flexible wiring in complex control circuits.
• Complete Kit: Includes pressure switch tubing and connectors to facilitate a professional, leak-free installation.

Is the 100166248 compatible with older Copper-Fin models?
Yes, this switch is the standard cross-reference for the PRS30029 used in many Copper-Fin II (CPN/CPL) and Commercial Boiler (CB/CW) units. Always verify your specific model and serial number before installation.

What causes a .95" WC pressure switch to trip?
Common failure points include blocked vent terminals, a failing inducer blower, or cracked silicone tubing. If the switch fails to close, the ignition control will halt the startup sequence for safety.

Can I use a generic pressure switch as a substitute?
It is highly recommended to use this genuine Lochinvar 100166248. Generic switches may not have the precise .95" WC setpoint required for OEM specifications, which can lead to nuisance tripping or unsafe operating conditions.

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.