AS NZS 60704.2.3 pdf download – Household and similar electrical appliances—Test code for the determination of airborne acoustical noise Part 2.3: Particular requirements for dishwashers

AS NZS 60704.2.3 pdf download Household and similar electrical appliances—Test code for the determination of airborne acoustical noise Part 2.3: Particular requirements for dishwashers
The appliance shall be operated according to 3.1 04 and shall be loaded according to 3.1 03. The test must be carried out with unsoiled loads and without detergents and rinsing aids. If the manufacturer’s instructions clearly describe the loading with the rated capacity, the instructions shall be followed; otherwise the principles of 3.1 03 have to be followed. In the latter case, at least two series of measurements shall be carried out. For the second or the following series of measurements, the load shall be reasonably redistributed, following as far as possible the hints given by the manufacturer for general use. If the dishwasher involves a regulator to adjust spray-force, water pressure shall be regulated according to the manufacturer’s instructions for the standard test programme (see 3.1 04). Care shall be taken to prevent avoidable noise by rattling of tableware through collision by water jets or spray arms.
NOTE Normally, a three-hour break with open door is sufficient to cool down the appliance, after an operational cycle.
6.5 Location and mounting of appliances
6.5.1 Addition: For floor-standing appliances and counter-top or table-top appliances intended for placing against a wall, the location shall be according to 6.5.3.
6.5.2 Not applicable 6.5.3 Replacement: For measurements on floor-standing appliances intended for placing against a wall (including cabinets, counters or test enclosures for building in or under counter types), a vertical reflecting plane shall be available. When the measurements are made in a hard-walled test room or in a special reverberation test room, a part of a wall of the room will serve for this purpose. The minimum area of this part of the wall should be determined by the projection of the appliance, extended by at least 0,5 m upwards and to both sides. The minimum distance between any surface of the appliance (cabinet, counter or test enclosure) and the nearest corner of the room shall be 1 m. When measurements are made in a free-field environment, a vertical-reflecting plane (supported by the horizontal reflecting plane) shall be provided. The minimum size of this vertical plane shall be at least equal to the size of the projection of the measurement surface . For both types of test environment, the requirements given below shall be followed:
• the acoustic absorption coefficient of the vertical reflecting plane shall be smaller than 0,06;
• the appliance shall be placed in the test environment without any resilient means other than those incorporated in the appliance;
• care should be taken to avoid any direct contact between the appliance (including protruding parts, worktops, spacers, etc.) and the vertical reflecting plane;
• the distance between the vertical reflecting plane and the appliance shall be established by placing the appliance in direct contact with the vertical reflecting plane and then moving it away at a distance of (1 0 ± 1 ) cm.
6.5.5 Replacement: The dishwasher manufacturer’s instructions regarding installation and use of the dishwasher shall be followed . Appliances with an unremovable worktop and appliances specified by the manufacturer for free-standing use only shall be measured free-standing. All other appliances shall be placed in a test enclosure, as described in figure 1 01 , and the worktop – if any – shall be removed. The front edge of the housing of the dishwashers designed to be built in (except door) shall be 20 mm to 25 mm behind the front edge of the test enclosure. If required by the manu- facturer’s instructions, the enclosure shall be provided with ventilation openings accordingly.