Siemens Building Technology S55180-A151 Actuator 322055-301 Common symptoms include the boiler

Common symptoms include the boiler short-cycling

Engineering specifications confirm that the 381-330-028 is the direct replacement for 381-330-022

essential for busy commercial environments

making it compatible with standard HVAC transformer outputs

a failed 24V relay coil or open contacts in the 56L68 are common culprits

Siemens Building Technology S55180-A151 Actuator 322055-301 Common symptoms include the boilerThe Siemens Building Technology S55180 A151 (Model SSB161. 05U) is a high precision electromotoric actuator engineered for the technical demands of HVAC building automation systems. This non spring return actuator is purpose built for proportional control in zone valve applications, specifically designed to integrate with Powermite 599 MZ Series globe valves. Operating on 24VAC DC power, it utilizes a 0 10VDC control signal to provide a linear stroke