De Dietrich Servomotor STA 30 B2 37/6 3N32L 200005398

The De Dietrich Servomotor STA 30 B2 37/6 3N32L (SKU 200005398) is a rotary actuator used to regulate airflow or water flow in heating systems. It delivers a torque of 1 Nm and completes a 90° rotation in 5 seconds. The housing is made of heat-resistant plastic and has protection class IP40. It supports control signals of three-point, 0-10 V, or on/off, and connects via screw terminals. This actuator is designed for installation in any position and fits De Dietrich G 300 S and G 300 N boilers.

When selecting a replacement actuator of this type, ensure the torque, running time, control signal type, angle of rotation, and mechanical interface match the original. The actuator may be coupled to an air damper or a mixing valve, and the shaft or coupling pattern must be compatible. Verify the electrical connection and control logic to ensure proper operation. Installation is straightforward and can be done in any orientation.

Common failures in such actuators include stripped gear trains, failed end switches, or a seized valve stem after prolonged standstill. Symptoms may include the damper or valve not moving, erratic positioning, or the system failing to modulate airflow or water flow correctly. Check the actuator's mechanical linkage and electrical connections for signs of wear or damage.