Lochinvar & A.O. Smith 100166244 Pressure Switch

The Lochinvar & A.O. Smith 100166244 is a critical OEM boiler replacement part engineered for precise air pressure monitoring within high-efficiency heating systems. This 1.06" WC SPDT pressure switch is a factory-certified component designed to ensure the inducer motor or blower is generating sufficient draft before allowing the ignition sequence to proceed. As a Single-Pole Double-Throw (SPDT) configuration, it provides versatile switching logic, making it essential for maintaining the safety string and preventing operation under blocked vent or failed intake conditions. This unit is physically and technically identical to part numbers PRS30025 and KIT30033, offering seamless integration with compatible Lochinvar and A.O. Smith commercial or residential boilers. With a fixed set point of 1.06 inches water column, it delivers the exact calibration required for high-performance HVAC combustion safety. Professional installation by a licensed technician is required to verify the pressure switch trip point and ensure the diaphragm responds accurately to the specific static pressure of your unit's venting system.

• OEM Compatibility: This is a genuine Lochinvar 100166244 part, ensuring exact fit and function as a direct PRS30025 replacement.
• Enhanced Safety: Fixed 1.06" WC calibration prevents the boiler from firing if venting is obstructed or the inducer fails.
• Durable Construction: Built to withstand the high-cycle demands of modern condensing boilers and commercial water heaters.
• Verified Electrical Logic: The SPDT pressure switch design allows for both normally open and normally closed circuit integration.

How do I know if my 100166244 pressure switch has failed?
Common indicators include the boiler cycles but fails to ignite, or an error code related to "Air Proving" or "Fan Proof" appears on the control board. Resistance across the terminals should be checked while the inducer is running to confirm the 1.06" WC pressure switch is closing the circuit.

What models is this part compatible with?
The Lochinvar 100166244 is used extensively across various Lochinvar and A.O. Smith boiler series. Always verify the MPN against your specific model's parts list; it is a direct substitute for the PRS30025 and KIT30033 numbers found in older manuals.

Can I use an adjustable switch instead of this fixed 1.06" WC unit?
For safety and performance, we recommend only using the OEM pressure switch specified by the manufacturer. Deviating from the factory 1.06" WC setting can lead to improper combustion or safety shutdowns.

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.