this limit control switch is typically utilized in the 24V safety string but is rated for standard pilot duty applications found in York gas furnaces and package units

installing a genuine 2521301S is the only way to restore the equipment to its original AFUE rating and factory performance standards

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

As the direct replacement for the legacy Bard 5651-094

This modulating actuator is compatible with 0-10 Vdc

ZoneFirst ZDS-30X10 Damper 30067439-890 this limit control switch isThe 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