Lochinvar & A.O. Smith 100166234 1.15″wc SPDT Pressure Switch

Description

Lochinvar & A.O. Smith 100166234 Pressure Switch Overview

The Lochinvar & A.O. Smith 100166234 is a factory-specified SPDT (Single-Pole Double-Throw) pressure switch engineered for use in Lochinvar and A.O. Smith boilers and water heaters. With a calibrated set point of 1.15″ water column (“wc), this switch monitors combustion air or venting pressure to confirm safe operating conditions before allowing burner ignition — a critical safety function in modern condensing and non-condensing heating equipment.

Key Features

• OEM part number 100166234 — direct factory replacement
• 1.15″ water column (“wc) calibrated set point
• SPDT (Single-Pole Double-Throw) switching action for versatile circuit control
• Designed for Lochinvar and A.O. Smith boilers and water heaters
• Monitors draft/combustion air pressure to ensure safe burner operation
• Helps prevent unsafe ignition under blocked flue or inducer fault conditions

Application

This pressure switch is a key safety component in the combustion air proving circuit. It verifies that the draft inducer is operating correctly and that adequate airflow is present before the control board allows the burner to fire. Replacing a failed or out-of-spec pressure switch with the correct OEM part ensures your equipment operates safely and within manufacturer specifications.

Why Choose the OEM Part?

• Precise 1.15″wc factory-calibrated trip point — no guesswork
• Guaranteed fit and function for Lochinvar & A.O. Smith equipment
• Maintains equipment warranty compliance
• Reliable SPDT contacts for accurate control circuit integration