A method for configuring components (1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h) in an air treatment system, e.g. a Heating and Ventilating Air-Conditioning (HVAC) system, said air treatment system comprising one or several components (1a-1h) being selected to be from the groups of flow control components (1a, 1b, 1c, 1d), sensor components (1e, 1f, 1g) or input control components, said components (1a-h) being connected to a central control system when the components (1a-h) are configured and the air treatment system is in use, said components (1a-h) being provided with a transmitter and/or receiver for sending an input signal to the central control unit to be used for computing a control output command by the central control unit and/or receiving an output signal from the central control system in order to control the component (1a-h) associated with the respective transmitter and/or receiver, each of said components (1a-h) further being provided with an indicator and an Electronic Control Unit being programmed to activate the indicator so as to indicate when the component has been selected by an identifier sending an identification signal selecting one or several of the components (1a-h) wherein said configuration comprises the steps of: I. PREPARATION a. Locating at least one component (1a-h) at its intended physical position in the air ventilation system, said component (1a-h) being assigned a unique component ID (cID) before or after it has been located at its intended position b. Providing the identifier with a system description of the air ventilation system including a configuration list with system location IDs (sl-ID) for components (1a-h) to be connected to the central control system II. SELECTION PROCEDURE c. Identifying the physical location in the air ventilation system of the desired component (1a-h) to be configured and locate the identifier to be in reach for wireless communication with the desired component (1a-h) d. Using the identifier for sending an identifying signal in order to identify the desired component (1a-h) e. Repeating step c until the indicating signal from the indicator of the desired component (1a, 1b, 1c, 1d, 1e, 1f) is indicating a selected state and the identifier displays only the desired component (1a, 1b, 1c, 1d, 1e, 1f), or displays only one component (1a, 1b, 1c, 1d, 1e, 1f) being in the same selected state as indicated by the indicator, of the components in the configuration list III. CONFIGURATION f. Initiating a pairing event in which the desired component (1a-h) having its unique component ID (cID) and indicated to be in a selected state by the indicator is paired with the system location ID, which is displayed in the identifier, such that the desired component (1a-h) may be recognized by the central control unit by the system location ID. I. PREPARATION a. Locating at least one component (1a-h) at its intended physical position in the air ventilation system, said component (1a-h) being assigned a unique component ID (cID) before or after it has been located at its intended position b. Providing the identifier with a system description of the air ventilation system including a configuration list with system location IDs (sl-ID) for components (1a-h) to be connected to the central control system a. Locating at least one component (1a-h) at its intended physical position in the air ventilation system, said component (1a-h) being assigned a unique component ID (cID) before or after it has been located at its intended position b. Providing the identifier with a system description of the air ventilation system including a configuration list with system location IDs (sl-ID) for components (1a-h) to be connected to the central control system II. SELECTION PROCEDURE c. Identifying the physical location in the air ventilation system of the desired component (1a-h) to be configured and locate the identifier to be in reach for wireless communication with the desired component (1a-h) d. Using the identifier for sending an identifying signal in order to identify the desired component (1a-h) e. Repeating step c until the indicating signal from the indicator of the desired component (1a, 1b, 1c, 1d, 1e, 1f) is indicating a selected state and the identifier displays only the desired component (1a, 1b, 1c, 1d, 1e, 1f), or displays only one component (1a, 1b, 1c, 1d, 1e, 1f) being in the same selected state as indicated by the indicator, of the components in the configuration list c. Identifying the physical location in the air ventilation system of the desired component (1a-h) to be configured and locate the identifier to be in reach for wireless communication with the desired component (1a-h) d. Using the identifier for sending an identifying signal in order to identify the desired component (1a-h) e. Repeating step c until the indicating signal from the indicator of the desired component (1a, 1b, 1c, 1d, 1e, 1f) is indicating a selected state and the identifier displays only the desired component (1a, 1b, 1c, 1d, 1e, 1f), or displays only one component (1a, 1b, 1c, 1d, 1e, 1f) being in the same selected state as indicated by the indicator, of the components in the configuration list III. CONFIGURATION f. Initiating a pairing event in which the desired component (1a-h) having its unique component ID (cID) and indicated to be in a selected state by the indicator is paired with the system location ID, which is displayed in the identifier, such that the desired component (1a-h) may be recognized by the central control unit by the system location ID.