Constructed with a 1-inch union sweat connection

maintaining head pressure stability

rated for a maximum working pressure of up to 680 psig in T-style shells

Technicians should also verify that the plunger moves freely within the assembly to prevent coil overheating or intermittent failure

Belimo FSTF120 Actuator R-410A Constructed with a 1-inch unionThe Belimo FSTF120 Fire Smoke Actuator is a specialized 120V AC solution engineered for life safety applications in commercial HVAC systems. This fail safe spring return actuator provides 18 in lb of torque, ensuring reliable fire and smoke damper control under extreme conditions. Designed for UL555 and UL555S compliance, it features a 75 second motor drive time and a rapid fail safe response of under 25 seconds to prevent smoke migration. The NEMA 2