GB/T 21551.6-2024 PDF English
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Antimicrobial and cleaning function of household and similar electrical appliances - Part 6: Particular requirements for air conditioner
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| GB 21551.6-2010 | English | 139 |
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GB/T 21551.6-2024: Antimicrobial and cleaning function of household and similar electrical appliances - Part 6: Particular requirements for air conditioner
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140.30
CCS Y 61
Replacing GB 21551.6-2010
Antimicrobial and Cleaning Function of Household and
Similar Electrical Appliances - Part 6.Particular
Requirements for Air Conditioner
Issued on: DECEMBER 31, 2024
Implemented on: JANUARY 1, 2027
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 7
2 Normative References... 7
3 Terms and Definitions... 8
4 Technical Requirements... 8
5 Test Methods... 10
6 Marking and Instructions for Use... 13
Appendix A (normative) Test Method for Self-cleaning Performance... 14
Bibliography... 18
Antimicrobial and Cleaning Function of Household and
Similar Electrical Appliances - Part 6.Particular
Requirements for Air Conditioner
1 Scope
This document specifies the hygiene and safety, and functional requirements for household and
similar air conditioners with the antimicrobial, microbial reduction and cleaning functions, as
well as the marking requirements, and describes the corresponding test methods.
This document applies to the production, inspection and sales of household and similar air
conditioners (hereinafter referred to as “air conditioners”) with one or multiple functions of
antimicrobia, preventing mildew, microbial reduction, indoor air cleaning and self-cleaning, etc.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB 4789.2 National Food Safety Standard - Microbiological Examination of Food. Aerobic
Plate Count
GB/T 7725 Room Air Conditioner
GB/T 18204.2 Examination Methods for Public Places - Part 2.Chemical Pollutants
GB/T 18801 Air Cleaner
GB/T 18883 Standards for Indoor Air Quality
GB/T 21551.1 Antimicrobial and Cleaning Function of Household and Similar Electrical
Appliances - Part 1.General Requirement
GB/T 21551.2 Antimicrobial and Cleaning Function of Household and Similar Electrical
Appliances - Part 2.Particular Requirements for Material
GB/T 21551.3 Antimicrobial and Cleaning Function of Household and Similar Electrical
Appliances - Part 3.Particular Requirements for Air Cleaner
GB 44498 Household and Similar Electrical Appliances - Health Technical Specification
3 Terms and Definitions
The terms and definitions defined in GB/T 21551.1 and GB/T 7725, and the following are
applicable to this document.
3.1 self-cleaning
The process of using physical or chemical methods, such as. ultraviolet lamp and negative ions
to remove or reduce the microorganisms inside the indoor unit of the air conditioner (filter
screen, evaporator, fan, air guide blades, etc.).
3.2 self-cleaning rate
In the self-cleaning test, the value of the reduction in the number of microorganisms expressed
as a percentage.
3.3 indoor air cleaning
The process of adopting certain technologies or methods to significantly reduce the
concentration of particulate matters or gaseous pollutants (formaldehyde, benzene and TVOC,
etc.) in the air through self-circulation of indoor air.
3.4 clean air delivery rate; CADR
The parameter of the cleaning capacity of an air conditioner with the indoor air cleaning
function for target pollutants (particulate matters or gaseous pollutants) under specified
conditions. It indicates the rate at which, the air conditioner provides clean air.
[source. GB/T 18801-2022, 3.8, modified]
3.5 cumulate clean mass; CCM
The parameter of the cumulate cleaning capacity of an air conditioner with the indoor air
cleaning function for target pollutants (particulate matters or gaseous pollutants) under
specified conditions. It indicates the total mass of target pollutants treated by cumulate cleaning
when the clean air delivery rate of the air conditioner decays to 50% of the initial value.
[source. GB/T 18801-2022, 3.9, modified]
4 Technical Requirements
4.1 Hygiene and Safety Requirements
4.1.1 Air conditioners with the antimicrobial, microbial reduction and cleaning functions shall
comply with the hygiene and safety requirements in GB/T 21551.1.
g) TVOC concentration test equipment shall satisfy the requirements of GB/T 18883.
Online instant-reading gaseous pollutant mass concentration tester may also be used.
its resolution shall not be lower than 0.01 mg/m3, and the test instrument needs to be
regularly calibrated in accordance with its measurement range;
h) The PM10 concentration test equipment may use a particulate matter mass
concentration tester. the resolution is not lower than 0.001 mg/m3, and the maximum
allowable error is 10%.
5.1.3 Prototype settings
When the air conditioner is tested for harmful substances, microbial reduction and cleaning, it
shall be operated under the normal working conditions (the mode with the optimal cleaning
effect) explicitly stated by the manufacturer. If the manufacturer does not specify, the air
conditioner shall be operated at the maximum wind speed gear.
When conducting microbial reduction and cleaning tests on split-type air conditioners, only the
indoor unit shall be operated and there is no need to start the outdoor unit.
When conducting microbial reduction and cleaning tests on integral air conditioners, only the
air supply function shall be operated, and there is no need to start the cooling or heating function.
When the air conditioner is undergoing a self-cleaning test, it shall be operated in accordance
with the working mode explicitly stated by the manufacturer.
5.2 Hygiene and Safety Test
5.2.1 Hygiene and safety test of components and parts
The antimicrobial or preventing mildew materials or components and parts used for air
conditioners shall be tested in accordance with the method described in GB/T 21551.1.
5.2.2 Hygiene and safety test of the whole machine
5.2.2.1 Requirements for sampling points
The harmful substance release test of air conditioners shall use the test value minus the
laboratory environment background concentration value as the test result. The laboratory
background environment shall comply with the requirements of GB/T 18883.
The appliance shall be stably operated for at least 30 minutes before starting the test.
“5 cm or 20 cm from the air outlet” means that the vertical distance between the sampling point
and the center of the plane where the air outlet is located is 5 cm or 20 cm. The TVOC sampling
time should be 45 minutes; the sampling frequency for ozone leakage and PM10 concentration
is 1 time/min, and the test time shall not be lower than 20 minutes. If there are multiple points,
take the maximum value of all points as the final result.
“5 cm around the appliance” means that the vertical distance between the sampling point and
the center of each plane of the prototype to be tested is 5 cm, and there are up, down, front,
back, left and right, a total of six points, and the maximum value is taken as the final result.
NOTE. the sampling points comply with the actual installation conditions. If it is an integral or
split floor-standing air conditioner, no sampling is required at the “bottom”; if it is a split
wall-mounted air conditioner, no sampling is required at the “back”. For other situations,
refer to this for implementation.
5.2.2.2 Ozone leakage
The ozone leakage test adopts the ultraviolet photometry method specified in GB/T 18883.
5.2.2.3 UV leakage
When testing the UV leakage, the air conditioner needs to be placed in a dark room (with the
walls painted black). After the prototype is turned on and runs for 5 minutes, directly use a
ultraviolet radiation meter to test the UV intensity at 5 cm around the air conditioner. Measure
the ultraviolet light at a main wavelength of 253.7 nm and take the maximum value as the test
value. If the manufacturer explicitly states that the main wavelength of ultraviolet light is
another value, then, additional tests shall be carried out for that wavelength.
5.2.2.4 TVOC concentration
The TVOC concentration at the air outlet of the air conditioner shall be tested in accordance
with the solid adsorption-thermal desorption-gas chromatography-mass spectrometry method
specified in GB/T 18883 and may also be tested using an online gaseous pollutant concentration
tester.
5.2.2.5 PM10 concentration
The PM10 concentration at the air outlet of the air conditioner shall be tested in accordance with
the light scattering method specified in GB/T 18204.2.
5.3 Tests of the Antimicrobial, Microbial Reduction and Cleaning Functions
5.3.1 Antimicrobial and preventing mildew functions
The antimicrobial and preventing mildew materials and components and parts used for air
conditioners shall be tested in accordance with the method described in GB/T 21551.2.
5.3.2 Function of microbial reduction
The microbial reduction function of the air conditioners shall be tested in accordance with the
method described in GB/T 21551.3.
5.3.3 Function of indoor air cleaning
Appendix A
(normative)
Test Method for Self-cleaning Performance
A.1 Test Microorganisms
Staphylococcus albus CGMCC 1.3374.
Other bacterial species or strains may also be selected as test bacteria, but all bacterial species
or strains used for testing shall be provided by corresponding national bacterial species
preservation and management institutions, and the test bacterial species and classification codes
shall be indicated in the report.
Laboratories shall use test microorganisms in accordance with relevant national safety
regulations. If other test pathogens are selected, the laboratories shall have a biosafety
protection level that is compatible with the hazards and shall not involve the first and second
categories of pathogenic microorganisms in the Catalogue of Pathogenic Microorganisms
Transmissible to Humans.
The various culture medium components used to culture bacterial species shall comply with the
requirements of the bacterial species preservation and management institutions.
A.2 Reagents and Equipment
A.2.1 Reagents
A.2.1.1 Nutrient agar (NA) medium
Beef extract 5.0 g
Peptone 10.0 g
Sodium chloride 5.0 g
Agar 15.0 g
Preparation method. dissolve the other components except agar in 1, 000 mL of distilled water,
use 0.1 mol/L NaOH solution to adjust the pH to 7.2 ~ 7.4, add agar, heat to dissolve it, divide
the contents into portions, and at 121 C, sterilize them in a pressure steam sterilizer for 20 min.
The above formula is prepared as nutrient broth medium without adding agar.
If commercial culture medium is used, it shall be prepared and sterilized in accordance with the
preparation method and sterilization conditions specified on the culture medium.
A.2.1.2 Tryptone soy broth (TSB) medium
The concentration of the bacterial suspension can also be roughly estimated using turbidimetry,
that is, measuring the absorbance of the bacterial suspension at a wavelength of 600 nm.
If the prepared bacterial suspension is not immediately used, it shall be stored at 4 C and used
within 2 hours.
A.5 Test Steps
A.5.1 Preparation of bacterial slices
The bacterial slices are made by dripping bacterial solution onto a carrier, and the carrier is a
water-based microporous filter membrane (pore size 0.45 m, diameter 50 mm 5 mm). During
bacteria contamination, spread the sterilized dry carrier slice flat on a sterile plate and dropwise
add bacterial solution to each slice, with (200 ~ 300) L per slice. The number of recovered
bacteria on each bacterial slice, as obtained by counting the viable bacteria culture, shall be no
less than 106 CFU/slice. The bacterial slices shall be dried naturally at room temperature before
use.
Before testing, keep the bacterial filter membrane in a fully moistened state (if a small amount
of bacterial solution cannot fully moisten the filter membrane, add sterile water to moisten the
filter membrane first).
If the test site has a complete flat surface, the bacterial solution can also be directly applied to
the corresponding position.
A.5.2 Placement of bacterial slices
Evenly place the plate with moist bacterial slices in the gap inside the indoor unit body and
close the wind deflector.
In order to ensure that the plate can be stably placed in the prototype, compared to the actual
installation state, the installation state and some structures of the test prototype may need to be
changed, for example, maintaining the wall-mounted air conditioner in an inclined position.
The bacterial slices can also be pasted on the surface of each component and part that needs to
be tested.
A.5.3 Self-cleaning test
Start the program corresponding to the self-cleaning function of the test prototype. The test time
shall comply with the time required by the appliance, but shall not exceed 4 hours. Evenly
arrange the bacterial slices on the filter screen, evaporator, fan, the inner rear part of the rear
frame shell, and the middle positions of the upper and lower air guide blades, and the left and
right air guide blades of the prototype, with 2 slices evenly arranged in each position, for a total
of 12 slices.
If necessary, sampling at other locations may also be added.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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