Trane SWT3982 Switch 321894-709 this 664593 distributor assembly is

this 664593 distributor assembly is widely used in Nordyne air handlers and heat pumps requiring a 3/8" inlet

ANSI Class IV Leakage: Tight shut-off performance minimizes energy loss and ghost heating in inactive zones

The package contains a core assembly

a persistent clicking from the igniter without flame production

Replacing a worn or drifting switch with this factory-spec component is essential for restoring the HVAC high limit safety standards of the original equipment

Trane SWT3982 Switch 321894-709 this 664593 distributor assembly isThe Trane SWT3982 is a critical high limit reverse flow switch designed for precision thermal monitoring in light commercial and residential HVAC systems. Engineered for specific setpoints, this bimetal snap action switch features a 105F opening temperature and resets on a temperature fall at 95F. This 10 degree differential ensures stable cycling and prevents short cycling of the compressor or heater banks during low airflow conditions. Built to