Siemens Building Technology GVD321.1U Actuator 318973-401 If the motor is humming

If the motor is humming but not spinning

What is the best placement for this duct sensor

This Siemens 599-10321 ball valve features a 1/4-turn rotary control mechanism and a blow-out proof stem to maintain ANSI Class IV leakage standards even at a 200 psi close-off pressure

Dual Display Windows: Dedicated cutouts for both setpoint adjustment and thermometer monitoring

Siemens Building Technology GVD321.1U Actuator 318973-401 If the motor is hummingThe Siemens Building Technology GVD321. 1U Actuator is a high torque, electronic solution purpose built for 2 position control in UL listed fire and smoke damper applications. Engineered for the rigors of life safety systems, this 230V spring return actuator delivers a robust 200 lb in of torque, ensuring positive closure and opening of high resistance dampers in commercial HVAC environments. Operating with a 30 second nominal drive time and a 15