Siemens Building Technology 331-4824 Actuator 326058-755 this Bard replacement control board

this Bard replacement control board features a 24V input circuit and high-amperage relay outputs to handle the inductive load of constant-torque motors or multi-speed PSC blowers

Durable Construction: Built to withstand the vibrating environments and thermal cycling common in commercial condensing units

Safety Verified: Meets all manufacturer specifications for combustion safety and reliable exhaust venting

cast iron drainage fitting specifically engineered for Watts Series 909 RPZ backflow preventers within the ¾" to 1" and 1-¼" to 2" size ranges

the unit features SPST switching action and a fixed differential of 15°F to maintain precise boiler thermal cycles

Siemens Building Technology 331-4824 Actuator 326058-755 this Bard replacement control boardThe Siemens 331 4824 is a #3 pneumatic damper actuator engineered for proportional control in medium duty HVAC applications. Operating within a spring range of 8 to 13 psi, this unit provides a reliable 2 3 4 inch stroke, making it a standard solution for terminal units, small to medium dampers, and mixing boxes. Built with a rugged aluminum housing and a durable internal diaphragm, this direct acting actuator ensures consistent positioning even in