Trane CNT4821 Limit Switch 319852-301 this board is the primary

this board is the primary interface for managing critical HVAC system diagnostics

While the W40102 is a high-quality wrot copper fitting

this is a single-speed 115V motor

Common Questions: How do I test if the float is operational

and WeatherKing furnace models

Trane CNT4821 Limit Switch 319852-301 this board is the primaryThe Trane CNT4821 Limit Switch is a high reliability safety component engineered for precision thermal monitoring in furnaces and air handlers. Featuring a 180F Auto Reset bi metal disc mechanism, this switch serves as a critical fail safe by opening the electrical circuit when internal plenum temperatures exceed safe operational limits. Once the temperature descends below the reset threshold (typically 160F), the bi metal disc automatically returns