On models with integral motion sensing capability, the motion sensor is enabled with a default timeout of 15 minutes from the last detection of motion in the zone. On models without an integrated sensor, the default timeout is still 15 minutes, but it only is applied when one of the two configurable binary inputs is set to be a motion sensor (see TEC3000 Series Proportional Fan Coil Thermostats Installation Guide LIT-12013162 for information about configuring the binary inputs). To disable motion sensing capabilities, set the Motion Sensor Timeout to 0 minutes.