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For the automatic control of electric heating and cooling loads. The passive infra-red detector detects whether somebody is present in the vicinity. If somebody is present the heating/cooling is controlled by the thermostat.
There is a 'deadzone' adjustment and a run-on time adjustment to avoid excessive switching of the cooling load.
If nobody is present in the room temperature is allowed to rise/fall to a to a lower base level which is also adjustable.