Siemens Actuator SQN30.151A2700

This item is an actuator for air dampers and mixing valves in burner and boiler systems. It converts a control signal into rotary movement to position a damper or valve. It is made by Siemens and carries the type designations 23300, 1.07533.0, and 01075330. This actuator is typically installed between the burner control and the air damper on the fan, or between a controller and a three-way or four-way mixing valve.

When selecting a replacement for this type of actuator, match the torque, running time, and control signal format (three-point, 0-10 V, or on/off) to the existing assembly. Also compare the shaft or coupling pattern, angle of rotation, and presence of integral auxiliary switches. The actuator is usually a separate item from the valve body, and the valve motor is often ordered as a spare part. Check these points before ordering.

Typical failure modes for this kind of actuator include a stripped gear train, a failed end switch, or a seized valve stem after an extended standstill. As a result, the damper or valve may not move or may stop in an intermediate position, causing incorrect combustion airflow or water mixing. Inspect the actuator and valve stem, and verify that the end switch operates correctly.