Johnson Controls S66DC-1 S66 Series Electronic Fan Speed Control [Refurbished]

The S66 Series Electronic Fan Speed Control is designed to modulate the speed of single-phase, permanent split-capacitor motors that have been approved for speed control by the motor manufacturer. The S66 permits variable speed control of ventilation fans in response to a DC input signal. Compatibility with various VAV Box controllers allows for fan speed adjustment to meet cfm requirements.. Johnson Controls. Johnson Controls. S66DC-1.