Description
Lochinvar & A.O. Smith 100308926 Air Pressure Switch
The Lochinvar & A.O. Smith 100308926 is an OEM air pressure switch designed as a direct replacement for compatible Lochinvar and A.O. Smith water heater and boiler applications. Engineered to monitor negative air pressure within the combustion air system, this switch provides a critical safety interlock that confirms proper venting and draft inducer operation before allowing burner ignition — helping protect equipment and occupants from unsafe operating conditions.
Product Overview
Air pressure switches are essential safety components in modern induced-draft and condensing boilers and water heaters. The 100308926 is factory-calibrated to a set point of -1.75″ water column (WC), ensuring the control system only permits burner operation when the draft inducer is producing the correct negative pressure. If the required pressure differential is not achieved — due to a blocked flue, failed inducer motor, or other venting issue — the switch remains open, preventing ignition and alerting the system to a fault condition.
Key Features
- OEM replacement air pressure switch for Lochinvar and A.O. Smith equipment
- Factory-set pressure rating: -1.75″ WC (water column)
- Monitors negative air pressure in the combustion/venting system
- Provides safety interlock to prevent ignition under unsafe draft conditions
- Designed for use in induced-draft and condensing boiler/water heater applications
- Direct OEM fit for compatible Lochinvar and A.O. Smith models
Application
This pressure switch is intended for use as a replacement part in Lochinvar and A.O. Smith residential and commercial boilers and water heaters equipped with induced-draft combustion systems. Always verify compatibility with your specific equipment model number before installation.
Installation Notes
- Refer to the original equipment manufacturer’s service manual for wiring diagrams and installation procedures
- Ensure all gas and electrical supplies are shut off before servicing
- Replace with identical OEM part to maintain equipment warranty and safety certification compliance
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