The York S1-6052909 VFD Programmed Controller is a 4.2A variable frequency drive controller designed for compatible York Small Sunline HVAC equipment. It controls motor speed by adjusting the frequency and voltage supplied to the motor, supporting precise and efficient system operation. This programmed controller is used in compatible commercial rooftop air-conditioning and heating un... https://www.partshnc.com/s1-6052909-york-vfd-prgrm-4-2a-small-sunline