IEC 60704-2-5:2005 pdf download – Household and similar electrical appliances – Test code for the determination of airborne acoustical noise – Part 2-5: Particular requirements for electric thermal storage room heaters.
3.1 02 minimum discharge condition condition under which the appliance is operated, the means for controlling the heat output, such as flaps and fans, being set at the lowest position. [IEC 60531 :1 999, definition 3.2]. 3.1 03 . maximum discharge condition condition under which the appliance is operated, the means for controlling the heat output, such as flaps and fans, being set at the highest position, any boost position being ignored. NOTE A boost position is a setting of a control for occasional use, which results in a higher temporary fan speed. [IEC 60531 :1 999 definition 3.3]. 4 Measurement methods and acoustical environments This clause of Part 1 is applicable except as follows: 4.2 Direct method Addition: NOTE 1 01 If pure tone components are present in the noise emitted, proper precautions should be taken as specified in ISO 3743-2. 4.3 Comparison method Addition: NOTE 1 01 If pure tone components are present in the noise emitted, proper precautions should be taken as specified in ISO 3743-1 and ISO 3743-2. 5 Instrumentation This clause of Part 1 is applicable. 6 Operation and location of appliances under test This clause of Part 1 is applicable except as follows: 6.1 Equipping and pre-conditioning of appliances 6.1 .1 Replacement: The appliance shall be assembled and mounted as specified by the manufacturer. Air inlet and outlet openings, louvers, flaps, air filters, fans, blowers, etc., and the path(s) for the air within the appliance shall be clean. 6.1 .3 Replacement: Prior to noise measurements, any fan or blower shall have been in operation for a total period of at least 1 h for running-in, at the highest speed setting for normal permanent use.
6.1 .4 Replacement: Immediately before each series of noise measurements, the appliance equipped in accordance with 6.1 .1 , is operated for stabilizing at the highest speed setting for normal permanent use for at least 2 min. 6.2 Supply of electric energy and of water or gas 6.2.1 Modification: The voltage tolerance shall be ± 0,5 %. 6.2.2 Not applicable 6.2.4 Not applicable 6.4 Loading and operating of appliances during tests 6.4.2 Replacement: The appliance shall be equipped according to 6.1 .1 . The noise emission values shall be determined for the highest speed setting of the fan for normal permanent use (maximum discharge condition), without heating. Other possible speed settings (minimum discharge condition, boost position, etc.) can be measured in addition. NOTE 1 01 The relevant noise levels should be linked to the room heating capability provided by the manufacturer, according to IEC 60531 . 6.4.3 and 6.4.4 Not applicable 6.5 Location and mounting of appliances 6.5.2 Not applicable 6.5.3 Replacement: For measurements on floor-standing appliances intended for placing against a wall, including those for building in, a vertical reflecting plane having an acoustic absorption coefficient of less than 0,06 shall be used. When measurements are made in a reverberation test room, a part of the wall of the room will serve for this purpose. The minimum area of this part of the wall shall 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 or its cabinet and the nearest corner of the room shall be 1 m. When measurements are made in a free-field environment over a reflecting plane, the size of the vertical reflecting plane (supported by the horizontal reflecting plane) shall be at least equal to the size of the projection of the measurement surface.For both types of test environment the following requirements shall be complied with: – the appliance shall be placed in the test environment without any resilient means of support other than those incorporated in the appliance; – care shall be taken to avoid any direct contact between the appliance (including protruding parts, worktops, spacers, etc.) and the vertical reflecting wall; – the distance between the back of the appliance and the vertical reflecting plane shall be the minimum distance given by the manufacturer or (1 0 ± 1 ) cm, whichever is the largest. 6.5.4 Addition: The distance between the lowest edge of the appliance and the floor shall be the minimum distance given by the manufacturer or (25 ± 1 ) cm, whichever is the largest. 7 Measurement of sound pressure levels This clause of Part 1 is applicable except as follows. 7.1 Microphone array, measurement surface and RSS location for essentially free- field conditions over reflecting plane(s) 7.1 .3 Not applicable 7.1 .5 and 7.1 .6 Not applicable 7.4 Measurements 7.4.1 Addition: The A-weighted time-averaged sound pressure level shall be measured during at least 30 s.