Trane CNT4821 Limit Switch 321894-706 If one cell has failed

If one cell has failed due to age or stress

converting 120 Vac primary input into reliable 24 Vac secondary output

What symptoms indicate this transformer has failed

Where is the best place to install this valve

if power is present but no spark is generated

Trane CNT4821 Limit Switch 321894-706 If one cell has failedThe 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