The 51771U igniter features a vacuum encapsulation process using synthetic resin

Reduced Standby Loss: Closes the vent when the system is idle

As a single-phase motor with clockwise (CW) rotation (lead end)

ensuring the actuator overcomes friction and fluid pressure to reach the exact position requested by the pneumatic controller

OEM Precision: Direct York S1-324-36081-295 replacement ensures internal logic matches the original factory specifications for torque and CFM

Siemens Building Technology 331-4810 Actuator 320735-701 The 51771U igniter features aThe Siemens 331 4810 is a rugged, metal fabricated No. 3 Pneumatic Actuator engineered for reliable modulating or two position control of HVAC dampers and terminal units. Built with all metal construction and a totally enclosed housing, this 331 Series actuator is a staple for contractors maintaining mixing box dampers, unit ventilators, and air valves. It features a 2 3 8 inch stroke and a nominal 8 13 psi spring range, allowing for precise