The TC-ALTv2 provides automated on off and variable speed control based on temperature. It also features an alarm and three selectable modes with different on/off set points. The “On” set point for Mode 1 is 80?F/27°C, and is most appropriate for equipment room or closet applications. The set point for Mode 2 is 90?F/32°C, and is designed for cabinet, rack, and enclosure applications. Mode 3 is 100?F/38°C, and is also designed for cabinet, rack and enclosure applications but offers a higher set point for applications where the controller’s sensor must be in close proximity to components or a higher temperature is simply desired. This mode is also ideal for two stage cooling applications when two controllers are used with one controller set on Mode 2 and another set on Mode 3. For each Mode, the fan/s will turn on at 50% speed and will increase in speed in a linear progression until full speed is reached at ~10°F above the “On” set point. As the system cools down the fan/s will slow down in a linear progression and ultimately turn off when the temperature drops ~3°F/2°C below the “On” set point. The alarm is set at a fixed 115?F/41°C. Another advantage of the unit is that it can be mounted most anywhere since it utilizes a remote sensor. In even more extreme applications, the sensor can be extended to control remotely mounted fans in projector enclosures, ventilation applications, etc.