The Vari-Green^® HOA provides the hand/off/auto functionality of a motor starter and allows for easy integration into other building systems. Set fan speed at this control (hand mode), stop the fan (off mode), or have another control toggle the fan on/off (auto mode). Two auto modes are available. The first allows a user to set the fan speed on the control and turn the fan on/off remotely. The second, allows a user to turn the fan on remotely and pass a 0-10V signal from another control for a speed reference. 24V is also available for powering other controls.