Automatic Recovery: The auto-reset feature eliminates the need for manual resets after temporary high-limit conditions

the ST-D24 thermistor ensures tighter setpoint control and improved system efficiency across various air handling unit (AHU) configurations

System Protection: Provides reliable proof of airflow to prevent coil freezing or compressor damage during low-flow conditions

and multi-stage heating systems requiring a normally open contact

Can I use this 40VA transformer if my original part was rated for 30VA

ZoneFirst ZDS-30X10 Damper 30067439-890 Automatic Recovery: The auto-reset featureThe ZoneFirst ZDS 30X10 is a heavy duty rectangular zone damper designed for professional HVAC airflow management. Built with a sturdy extruded aluminum frame and parallel blades, this side mount damper is engineered for insertion into the 10 inch side of a 30" x 10" duct. It features a high torque 24VAC synchronous motor (Model MSS) that operates in a power closed spring return open configuration, ensuring a fail safe open position during power loss