Trane SWT3179 Pressure Switch Kit 321142-301 While it may appear similar

While it may appear similar to plates in other 40-series units

If the inducer is running and the lines are clear

Broad Operating Envelope: Rated for severe climates with a wide temperature tolerance from -40°C up to 105°C

this replacement heat exchanger restores factory-rated AFUE efficiency and prevents dangerous CO leakage into the building envelope

Flexible Fuel Capability: Fully compatible with natural gas

Trane SWT3179 Pressure Switch Kit 321142-301 While it may appear similarFor veteran HVAC contractors, the Trane SWT3179 Pressure Switch Kitwhich is functionally identical to the SWT03179is a critical component for restoring furnace ignition sequences. This 0. 8" WC setpoint switch is a Single Pole Double Throw (SPDT) configuration, making it highly versatile for monitoring induced draft blower performance and ensuring proper venting before the gas valve opens. Engineering wise, this OEM replacement part is built for snap