Lochinvar & A.O. Smith 100166220 .10″wc SPST Pressure Switch

Description

Lochinvar & A.O. Smith 100166220 SPST Pressure Switch Overview

The Lochinvar & A.O. Smith 100166220 is a genuine OEM Single-Pole Single-Throw (SPST) pressure switch engineered to provide precise, dependable draft or combustion air proving in Lochinvar and A.O. Smith boilers and water heaters. Calibrated to a set point of .10″ water column (.10″wc), this switch monitors system pressure and opens or closes the circuit at the specified threshold — helping protect the appliance from unsafe operating conditions caused by blocked flue passages or inadequate combustion air.

Key Features

• Genuine OEM replacement part for Lochinvar and A.O. Smith equipment
• SPST (Single-Pole Single-Throw) switching action for straightforward circuit control
• Calibrated set point of .10″ water column (.10″wc) for accurate pressure sensing
• Designed for draft proving and combustion air proving applications
• Helps prevent unsafe appliance operation due to restricted venting or flue blockage
• Direct drop-in replacement ensures proper fit and reliable performance

Application

This pressure switch is a critical safety component used in Lochinvar and A.O. Smith boilers and water heaters. It verifies that adequate draft or combustion airflow is present before allowing the burner to operate, protecting both the equipment and the building occupants. When replacing a failed or suspect pressure switch, always match the OEM part number to ensure correct set-point calibration and reliable safety operation.

Product Specifications

• Part Number: 100166220
• Switch Type: SPST (Single-Pole Single-Throw)
• Set Point: .10″ w.c. (inches water column)
• Brand: Lochinvar & A.O. Smith
• Application: Boiler / Water Heater Draft / Combustion Air Proving