KMC Controls MEP 3510 Actuator Refrigerant the FB751 1251 control module optimizes the FB751 1251 control module optimizes boiler energy efficiency and ensures the precise combustion air blower modulation required for the Crest series' high turndown ratios This liquid line filter drier is a standard setting component for technicians requiring high flow capacity with minimal pressure drop No Position Drift: The non spring return mechanism ensures the drive remains in "last position" during signal interruptions The KMC Controls MEP 3510 Actuator is a professional grade 24V floating actuator engineered for precise control in specialized HVAC applications