White-Rodgers Fan and Limit Controls

Snap-disc limits guard furnaces and duct temperatures where fixed or adjustable cutouts cycle fans or lock out heat. Manual-reset 3L02 and 3L12 models lock after rollout, while auto-reset 3L05, 3L11 and 3F11 versions close again after cooldown. Long-element 5D51 and 416 controls sense airstream temperature inside the plenum.