Common Questions: How do I know if my fan relay is failing

Depending on the contactor frame

Comprehensive Installation Hardware: Includes diverse terminal insulators and ceramic bushings to ensure a secure

and lighting circuits without the complexity of electronic controls

Siemens Building Technology S55180-A158 Actuator 322838-752 Common Questions: How do IThe Siemens Building Technology S55180 A158 (Model SSF161. 05U) is a high precision proportional electronic actuator designed for seamless integration with 599 Series zone valves. Engineered for performance in VAV systems, fan coil units, and chilled ceiling applications, this 24Vac dc actuator utilizes a 0 10 Vdc positioning signal to provide linear control with a 1 10 inch (2. 5 mm) stroke. As a non spring return (NSR), fail in place unit, it