Siemens Potentiometer ASZ22.30

The Siemens ASZ22.30 is a potentiometer used in HVAC actuator and burner/boiler control systems. It provides position feedback by varying resistance in relation to the actuator's mechanical position, allowing the control unit to monitor and regulate dampers or valves. This component is designed for use with Siemens actuators and control devices, and is listed under the spare parts category.

Parts of this type are selected by matching total resistance, electrical taper (linear or logarithmic), and mechanical configuration (shaft diameter, length, mounting pattern). Verify whether the original is used as a voltage divider (three-terminal) or as a variable resistor (two-terminal), and confirm that the power rating is adequate for the circuit. Before fitting, check that the resistance track is clean and the wiper makes smooth contact. If the original failed due to wear or moisture, confirm the replacement has a similar degree of sealing.