meaning it seals the valve when unpowered

this F135-30F fan control ensures the fan engages when the plenum reaches 135°F and terminates operation once it cools to 105°F (30°F differential)

Horizontal units require a dedicated horizontal scale dial to maintain correct visual alignment of the temperature set point

Key Benefits Exact OEM Cross-Reference: Serves as the direct replacement for 05-296623-751

Schneider Electric (Barber Colman) AM-321 Auxiliary Switch 30067439-890 meaning it seals the valveThe Schneider Electric AM 321 is a precision engineered 2 SPDT auxiliary switch designed to provide reliable position feedback and sequence control for HVAC actuators. Functioning as the AM 322 direct replacement, this unit is built for seamless integration with legacy Barber Colman and modern Schneider Electric actuator assemblies. The assembly features dual Single Pole Double Throw contacts with an adjustable differential, allowing field technicians