SRE07 series thermostat is mainly used in central air-conditioning and heating system. It detects room temperature and compares it with setting point, then provides control signal to central air-conditioning fan coil cool / heat motorized valves or other actuating mechanism. It can also control the fan blower of fan coil units and adjust the fan speed. When the SRE07 thermostat is turned off or get power supply after system power shut off, it can output a return signal to make the motorized valves or other actuating mechanism return.