Trane SWT3179 0.8″ w.c. SPDT Pressure Switch Kit

Description

Trane SWT3179 SPDT Pressure Switch Kit Overview

The Trane SWT3179 is an OEM replacement pressure switch kit engineered to deliver precise, dependable performance in Trane heating systems. Calibrated at a 0.8″ water column (w.c.) set point, this single-pole double-throw (SPDT) switch monitors draft pressure to verify proper inducer operation before allowing the burner to fire — a critical safety function in modern gas furnaces.

Key Features

• OEM Trane replacement part — ensures fit, form, and function with compatible Trane equipment
• SPDT (Single-Pole Double-Throw) switching action for reliable normally-open/normally-closed circuit control
• 0.8″ w.c. calibrated set point for accurate draft pressure sensing
• Monitors inducer motor operation to prevent unsafe burner ignition under improper draft conditions
• Kit format includes necessary hardware for straightforward field installation
• Designed for long service life in demanding HVAC operating environments

How It Works

The SWT3179 pressure switch senses negative pressure (draft) generated by the inducer blower. When the inducer establishes adequate airflow, the switch closes, signaling the control board that it is safe to proceed with ignition. If draft pressure falls outside the acceptable range, the switch remains open, locking out the burner and alerting the system to a potential venting or inducer issue.

Application

• Direct OEM replacement for Trane and American Standard gas furnaces requiring the SWT3179 pressure switch
• Suitable for residential and light commercial furnace applications
• Always verify compatibility with your specific unit model number before installation

Why Choose an OEM Trane Pressure Switch?

Using a genuine Trane OEM pressure switch ensures the correct set point calibration, connector compatibility, and long-term reliability. Aftermarket substitutes may not match the precise pressure rating, risking nuisance lockouts or, more critically, unsafe operation. The SWT3179 kit gives technicians confidence that the replacement meets the original equipment specification.