IEC 60704-2-5-2014 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.
1 Scope and object
This clause of Part 1 is applicable except as follows:
1 .1 Scope
1 .1 .1 General
Replacement:
These particular requirements apply to the electric thermal storage room heaters having forced convection output, designed for placing on the floor, for wall-mounting or for building-in.
These particular requirements do not apply to:
– controlled output thermal storage heaters with natural convection;
– free output thermal storage heaters;
– permanently installed central storage heating systems or their parts.
1 .1 .2 Types of noise
Replacement:
ISO 3743-1 , ISO 3743-2 and ISO 3744 can all be used for measuring noise emitted by electric thermal storage room heaters.
1 .1 .3 Size of the source
Replacement:
The method specified in ISO 3744 is applicable to noise sources of any size (limited only by available test environment). When applying ISO 3743-1 and ISO 3743-2, care should be taken that the maximum size of the appliance under test fulfils the requirements specified in 1 .3 of
ISO 3743-1 and ISO 3743-2.
1 .2 Object
Addition:
The frequency range of interest, for sound power determination on electric thermal storage room heaters, includes at least the octave bands with centre frequencies from 63 Hz to 8 000 Hz.
NOTE 1 01 In many cases, the 63 Hz octave band level does not participate significantly to the A-weighted level.
2 Normative references
This clause of Part 1 is applicable.
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
Addition:
3.1 01 storage heater
heater which stores heat obtained from electric energy by charging an accumulating core before a heat demand in a room occurs, the heat being discharged at any time.
[IEC 60531 :1 999, definition 3.1 1 ) ].
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.IEC 60704-2-5 pdf download.