BS EN IEC 60879:2019 pdf free download – Comfort fans and regulators for household and similar purposes – Methods for measuring performance (IEC 60879:2019)
5.1.4 Running-in of the fan
Prior to starting the tests on a new fan, it shall run at its maximum airflow setting with unrestricted air flow and with the oscillating mechanisms and moving louvres, if any, in operation for at least 1 hour to ensure adequate running-in. Any other functions such as luminaires, purifiers, humidifiers, heaters, if any, shall be connected.
5.1.5 Operation of the fan
Before starting the tests, the fan and its attachments are adjusted in accordance with the manufacturer’s instructions for normal operation. Any controls shall be set for maximum continuous air flow unless the manufacturer’s instruction states otherwise. Any other functions such as luminaires, purifiers, humidifiers, heaters, if any, shall be turned off.
The top of the test chamber shall be covered by the clapboard, except for a centrally situated circular opening (top-opening), the diameter (D) of the top opening shall be between 1 ,1 and 1 ,2 times the blade’s sweep. The top clapboard in which the top opening is located shall be not more than 6 mm thick. The bottom of the test chamber is 450 mm from the ground, to leave a suitable space for air outlet. Readings shall be taken from a position between the chamber and the outer screen, and a small shelf for electrical instruments may be provided in this space. Except for these, the space between the test chamber and the outer screen and the space inside the test chamber shall be clear of all obstructions, and any conditioning apparatus (including heating or cooling) shall have no influence on the movement of air in the test room while the test is in progress.
The room in which the test chamber and the outer screen are erected shall be suitably protected against extraneous draughts. Any ceiling external to the test chamber or any projecting beam which might interfere with the air flow shall be not less than 1 000 mm above the top opening, i.e. not less than 4 000 mm from the ground level at this point. The distances between the walls of the chamber and the walls of the outer screen shall be 1 000 mm to 1 250 mm. The fan shall be placed at such a height that the plane of the fan blades is 3 000 mm ± 1 0 mm from the ground level and lies in the plane of the top edge of the clapboard containing the top opening in the roof of the test chamber.
5.2.1.3 Arrangement of apparatus
The plane of the fan blades lies in the plane of the top edge of the clapboard containing the top opening in the roof of the test chamber. A flat plate is installed above the ceiling fan, the size of which shall be between 1 ,1 and 1 ,2 times the blade diameter. The distance between the plate and the plane of the fan blades is determined by the distance between the plane of the fan blades and the ceiling after the ceiling fan has been installed in accordance with the instructions for use. The plane of the anemometer’s vane is parallel to the plane of the fan blades. The anemometers shall be moved in either direction along both diagonals of the test chamber in a test plane 1  500 mm ± 1 0 mm below the plane of the fan blades. The anemometers shall be supported in such a manner as to cause as little obstruction as possible to the air flow.