Avoid mounting with the sample line connections pointing "up" to prevent moisture or debris accumulation from affecting the diaphragm's sensitivity

These part numbers are identical and refer to the same white orifice cartridge assembly

which is a common "pro-tip" to increase reliability in high-cycle environments

preventing hazardous operation during maintenance

Trane SWT1271 Limit Switch Avoid mounting with the sampleThe Trane SWT1271 is a critical furnace high limit switch designed for HVAC system diagnostics and thermal protection. As a standard OEM replacement part, this auto reset limit switch prevents the heat exchanger from reaching a hazardous open temperature of 180F, cutting off power to the gas valve until the unit cools to its 150F reset point. For technicians troubleshooting furnace short cycling or 4 flash error codes on a Trane or American Standard