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Durable Construction: Manufactured from robust steel to resist warping and ensure long-term stability within the air handler unit
The forged brass body and chrome-plated brass ball provide a rugged construction capable of handling body pressures up to 360 psi and a 75 psi close-off pressure
and Electronic Series 90 control
What causes a pressure switch lockout on a condensing boiler
Siemens Building Technology 331-2930 Actuator 328140-751 Durable Construction: Manufactured from robustThe Siemens Building Technology 331 2930 Actuator is a heavy duty, metal fabricated No. 4 pneumatic damper actuator designed for reliable control of HVAC systems. This pneumatic piston type actuator features an integral pivot mount and 4 inch stroke, providing the linear force necessary for the gradual or positive actuation of outdoor air dampers, mixing boxes, and fire smoke dampers. With a 3 13 psi spring range, this unit is engineered for precision
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