It should be used to signal a contactor or gas valve rather than carrying the full amp load of heating elements

This ASSE 1017 mixing valve is built with a rugged lead free copper silicon alloy body and features threaded union connections for straightforward serviceability and replacement of legacy units like the 0206010 or LF1170M2-UT-3/4 models

making it a preferred choice for residential and light commercial HVAC furnace repair

How do I know if I need a full mechanism or just the seat

Trane SWT3927 Limit Switch 322838-752 It should be used toThe Trane SWT3927 Limit Switch is a critical safety component designed for precise thermal regulation in residential and commercial forced air systems. This L155 60F limit switch features a cutout temperature of 155F and a 60F differential, ensuring the heat exchanger does not exceed safe operating parameters. When the plenum temperature hits the high limit setpoint, this genuine OEM Trane part interrupts the burner circuit, preventing equipment