Ventilation fan regulation method, for obtaining volumetric air flow for room ventilation device, uses control device with control voltage for regulating revs using characteristic defining dependency between revs and volumetric flow

摘要

The method uses a control device (9) for providing a control voltage for regulating the revs of an electric ventilation fan (3,6) using a specific characteristic defining the dependency between the revs and the volumetric flow for a fixed control voltage, or the dependency between the electric fan current and the volumetric flow for a fixed control voltage and a specific characteristic defining the dependency between the relative volumetric flow, provided by the actual volumetric flow to the maximum volumetric flow and a relative control voltage, provided by the ratio of the actual control voltage to the maximum control voltage. The control device is calibrated cyclically during the operation of the ventilation device by setting the calibration voltage and measuring the fan revs or current and calculating the corresponding volumetric flow. An Independent claim for a room ventilation device is also included.