Description
The Lochinvar & A.O. Smith 100308933 is an OEM air pressure switch engineered to deliver precise, dependable performance in water heater and boiler combustion air proving applications. Rated at 1.50″ water column (WC), this switch monitors the differential pressure produced by the inducer or draft blower to confirm proper airflow before allowing ignition to proceed — a critical safety function in modern condensing and non-condensing appliances.
Key Features
- OEM replacement part for Lochinvar and A.O. Smith water heaters and boilers
- 1.50″ WC set-point ensures accurate airflow verification during each ignition cycle
- Monitors inducer/draft blower operation to prevent unsafe combustion conditions
- Designed for direct drop-in replacement — no modifications required
- Manufactured to original equipment specifications for long-term reliability
Application
This air pressure switch is a direct OEM replacement designed specifically for compatible Lochinvar and A.O. Smith residential and commercial water heating equipment. It plays a vital role in the appliance’s safety circuit by proving that the combustion air inducer is operating correctly before the ignition sequence is allowed to continue. Replacing a faulty pressure switch with the correct OEM part helps restore proper system operation and maintain manufacturer safety standards.
Why Choose OEM?
- Guaranteed fit and function for designated Lochinvar & A.O. Smith models
- Maintains original equipment warranty compliance
- Eliminates guesswork associated with aftermarket alternatives
- Supports safe, code-compliant appliance operation
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