Description
The Lochinvar & A.O. Smith 100224394 is a factory-specified, normally closed (N.C.) pressure switch engineered for use in Lochinvar and A.O. Smith boilers and water heating equipment. Set at a precise -1.66″ WC (inches water column) trip point, this switch monitors combustion air or venting pressure to ensure safe and proper system operation. When the required pressure differential is not met — such as during a draft inducer fault or blocked flue condition — the normally closed contacts open to interrupt the ignition sequence, protecting the appliance and its users.
Using the correct OEM replacement pressure switch is critical to maintaining equipment safety certifications and reliable performance. This direct-replacement part ensures a proper fit and accurate set-point calibration consistent with the original factory specification.
Key Features
- OEM replacement pressure switch for Lochinvar and A.O. Smith equipment
- Set point: -1.66″ WC (inches water column)
- Normally Closed (N.C.) contact configuration
- Monitors combustion air or venting pressure for safe appliance operation
- Opens contacts on pressure loss to interrupt ignition and prevent unsafe operation
- Direct drop-in replacement for original factory part
Applications
- Lochinvar and A.O. Smith residential and commercial boilers
- Lochinvar and A.O. Smith water heaters with induced-draft or power-vent systems
Specifications
- Part Number: 100224394
- Switch Type: Pressure Switch
- Contact Configuration: Normally Closed (N.C.)
- Set Point: -1.66″ WC
- Brand: Lochinvar & A.O. Smith
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