Refers to the detection and comparison of a certain amount of a target quantity of an object of control, such as indoor temperature, humidity, supply water temperature, etc., in order to make it match the target value given from the outside, and to make it automatically perform a corrective action according to that value.
The automatic control system in air conditioning equipment generally employs a combination of sequence control and feedback control, and on-off and proportional action are used as the control action.