Lochinvar & A.O. Smith 100208384 Pressure Switch

The Lochinvar & A.O. Smith 100208384 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high-efficiency commercial boilers and hydronic heaters. Calibrated to an exact 0.85" WC (Water Column) set point, this OEM replacement part ensures the inducer blower is generating sufficient static pressure before allowing the ignition sequence to proceed. As a veteran-preferred SPDT (Single-Pole Double-Throw) switch, it provides reliable 125/250 VAC @ 10A electrical switching, effectively preventing operation under hazardous venting conditions such as blocked flues or intake obstructions. This pressure switch kit is engineered for a broad range of Lochinvar Knight and A.O. Smith Cyclone models, including the CHN and CHL series. Using genuine HVAC pressure switches is essential for maintaining the factory-specified air-to-fuel ratio and system pressure differentials, ensuring long-term operational stability for your clients' heating systems.

• Precise 0.85" WC Calibration: Ensures accurate sensing of the critical pressure differential required for safe burner ignition.
• Universal OEM Compatibility: Verified for use across multiple Lochinvar and A.O. Smith commercial boiler and water heater platforms.
• Heavy-Duty SPDT Contacts: Rated for 125/250 VAC, providing robust electrical performance in demanding commercial environments.
• Safety Logic Integration: Prevents gas valve energization in the event of venting failures or inducer blower malfunctions.
• Direct Drop-In Replacement: Simplifies field repairs by matching exact factory mounting specifications and 100208384 technical parameters.

What causes a Lochinvar air pressure switch code?
Common triggers include a failing inducer motor, obstructed venting, or cracked reference tubing. If the blower is running but the 0.85" WC switch fails to close, verify the actual pressure with a manometer before replacing the component.

Can I use a switch with a different WC rating?
No. Pressure switches are safety-critical components calibrated to specific venting requirements. Installing a switch with a different Water Column rating can result in incomplete combustion or dangerous delayed ignition.

Is the 100208384 compatible with both Lochinvar and A.O. Smith units?
Yes, this is an OEM part 100208384 used by both manufacturers in various high-efficiency hydronic and domestic hot water applications.

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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.