Description
Lochinvar & A.O. Smith 100158115 Normally Closed Air Pressure Switch
The Lochinvar & A.O. Smith 100158115 is an OEM-grade normally closed (N.C.) air pressure switch engineered for use in Lochinvar and A.O. Smith water heaters and boilers. Operating at a set point of -1.42″ water column (WC), this switch monitors combustion air and flue draft conditions to ensure safe and reliable burner operation. When the required pressure differential is not met, the normally closed contacts keep the burner circuit open, preventing unsafe ignition and protecting both equipment and occupants.
Key Features
- OEM replacement part for Lochinvar and A.O. Smith heating equipment
- Normally Closed (N.C.) contact configuration for fail-safe burner lockout
- Set point: -1.42″ WC (water column) pressure differential
- Monitors combustion air and draft inducer performance
- Helps prevent unsafe ignition under improper draft or airflow conditions
- Direct OEM SKU: 100158115 — ensures precise fit and compatibility
Application
This air pressure switch is a critical combustion safety component in Lochinvar and A.O. Smith residential and commercial water heaters and boilers. It works in conjunction with the draft inducer motor to verify adequate airflow before and during burner operation. Replacing a failed or out-of-spec pressure switch with the correct OEM part ensures the equipment operates within designed safety parameters and maintains manufacturer warranty compliance.
Why Choose OEM?
Using the genuine Lochinvar & A.O. Smith 100158115 pressure switch guarantees the correct set point calibration, connector compatibility, and long-term reliability. Aftermarket substitutes may not match the precise -1.42″ WC trip point, potentially causing nuisance lockouts or, worse, unsafe operation.
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