Description
Lochinvar & A.O. Smith 100166258 SPDT Pressure Switch Overview
The Lochinvar & A.O. Smith 100166258 is a Single Pole Double Throw (SPDT) pressure switch engineered as a direct OEM replacement for compatible Lochinvar and A.O. Smith boilers and water heaters. Calibrated to a set point of 1.35″ w.c. (inches water column), this pressure switch monitors combustion air or venting pressure to confirm safe operating conditions before allowing burner ignition — a critical safety function in modern heating equipment.
Key Features
- OEM part number 100166258 — direct factory replacement
- SPDT (Single Pole Double Throw) switching action for versatile circuit control
- 1.35″ w.c. calibrated set point for precise pressure sensing
- Designed for use with Lochinvar and A.O. Smith boilers and water heaters
- Monitors inducer/combustion air pressure to ensure safe burner operation
- Helps prevent unsafe ignition under improper draft or venting conditions
Application
This pressure switch is a safety-critical component used in the combustion air proving circuit of Lochinvar and A.O. Smith heating appliances. It verifies that the draft inducer is operating correctly before the control board permits ignition, protecting the appliance and occupants from hazardous conditions caused by blocked flues or inducer failure.
Why Choose OEM Replacement Parts?
Using genuine OEM replacement components like the 100166258 ensures proper calibration, reliable switching performance, and compatibility with your existing control board — helping maintain manufacturer warranty compliance and long-term system reliability.
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