This thermostat is the component of a cooling/heating system which regulates the temperature of an equipment so that the equipment's temperature is maintained within desired range. The thermostat does this by switching heating device on or off, or regulating the air flow of a cooling fan. The thermostat acts as control unit for both heating and cooling system. The thermostat uses remote sensor (thermistor) to measure the temperature in control point. At the moment the input voltage has been applied to the thermostat the output voltage and heater voltage are switched off and the thermostat analysis temperature. If the temperature is lower than setpoint value t_heating the thermostat prevents the power supplying of attached equipment (computer, display and so on) and starts heating. This is HEATING mode. While the heating is in progress the thermostat samples temperature and switches power for attached equipment on when the temperature reaches setpoint temperature t_on. This is CONTROL mode.

Documentation: Thermostat Quick Reference