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GB 25034-2010: Gas-fired heating and hot water combi-boilers
GB 25034-2010
GB
NATIONAL STANDARD OF THE
PEOPLE?€?S REPUBLIC OF CHINA
ICS 91.140.99
P 46
Gas-fired heating and hot water combi-boilers
ISSUED ON. SEPTEMBER 02, 2010
IMPLEMENTED ON. JULY 01, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 8
4 Classifications and their parameters ... 11
5 Material, construction and safety requirements ... 13
6 Performance requirements ... 23
7 Test methods ... 39
8 Inspection rules ... 92
9 Markings, warnings and instructions ... 94
10 Packaging, transportation and storage ... 100
Annex A (informative) Comparison between the clause number of this
Standard and the clause number of EN 483.1999 and EN 625.1996 ... 101
Annex B (informative) Technical differences between this Standard and EN
483.1999 and EN 625.1996 and their causes ... 102
Annex C (informative) Classification according to air supply and combustion
products evacuation installation method ... 103
Annex D (informative) Composition of gas automatic shut-off valve in gas
system and requirements for sealing force ... 106
Annex E (Informative) NOx pollution ... 108
Annex F (normative) Electrical safety of appliances using AC power supply113
Annex G (normative) Electromagnetic compatibility safety ... 124
Annex H (informative) Test method for the heat losses from the test rig of the
indirect method and the contributions of the circulating pump of the test rig 127
Annex I (informative) Test method for the ignition time at full load ... 128
Bibliography ... 129
Foreword
5.3.8, 5.4.3, 5.5.1, 5.5.2, 6.2.1, 6.3.4, 6.4.4, 6.5.3.2, 6.5.5.1 a), b), c), 6.5.5.2
a), b), c), d), e), 6.5.7.3 a), b), 6.6.2, 6.8.2, 9.1.1 d), 9.1.2, 9.2.1, 9.2.2 and
Annex F of this Standard are mandatory and the rest are recommended.
This Standard modifies EN 483.1999 ?€?Gas-fired central heating boilers - Type
C boilers of nominal heat input not exceeding 70 kW?€? (English version) and EN
625.1996 ?€?Gas-fired central heating boilers - Specific requirements for the
domestic hot water operation of combination boilers of nominal heat input not
exceeding 70 kw?€? (English version).
In order to facilitate comparison, a list of the comparison of the clauses of this
Standard and the clauses modified of the European standards is listed in Annex
A.
Due to the legal requirements of China and the special needs of industry, this
Standard was revised when the two European standards were adopted. A list
of technical differences and their causes is given in Annex B for reference.
This Standard deletes the following contents in EN 483.1999.
1) Annex A. Product classification and supply conditions of European
Community countries;
2) Annex B. Particular national conditions;
3) Annex E. Compilation of the test conditions;
4) Annex K. Examples for marking;
5) Annex N. Requirements and test methods for separate air supply and
combustion products evacuation ducts of type C6 boilers;
6) Annex Z. Clauses of this European standard addressing essential
requirements or other provisions of EU Directives;
7) Relevant content that the maximum heating working water pressure of
appliances is 6 kg.
Annexes D, F and G of this standard are normative annexes, Annexes A, B, C,
E, H, and I are informative annexes.
This Standard was proposed by Ministry of Housing and Urban-Rural
Development of the People?€?s Republic of China.
This Standard shall be under the jurisdiction of Ministry of Housing and Urban-
Gas-fired heating and hot water combi-boilers
1 Scope
This Standard specifies the terms and definitions, classifications and their
parameters, material, construction and safety requirements, performance
requirements, test methods, inspection rules, markings, warnings and
instructions, packaging, transportation and storage of closed gas-fired heating
and hot water combi-boilers (hereinafter referred to as ?€?appliances?€?).
This Standard applies to heating and hot water combi-appliances of which the
rated heat input is less than or equal to 70 kW, the maximum heating working
water pressure is less than or equal to 0.3 MPa, the water temperature during
work is not greater than 95 ??C, using atmospheric burner or fan-assisted burner
or full premix burner. This Standard also applies to single heating appliances.
This Standard does not apply to the following appliances.
- outdoor appliances with natural combustion products evacuation duct;
- condensing type appliances;
- combination type appliances;
- appliances in which two sets of independent combustion systems are used
for heating and hot water in the same enclosure, including appliances of
which heating and hot water systems have common duct.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For dated references, their
subsequent amendments (excluding corrigendum) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 191 Packaging - Pictorial marking for handling of goods (GB/T 191-
2008, ISO 780.1997, MOD)
GB/T 1019-2008 General requirements for the package of household and
similar electrical appliances
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1.
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection (GB/T 2828.1-2003, ISO 2859-1.1999, IDT)
GB/T 2828.2 Sampling procedures for inspection by attributes - Part 2.
Sampling plans indexed by limiting quality (LQ) for isolated lot inspection
(GB/T 2828.2-2008, ISO 2859-2.1985, NEQ)
GB 4208 Degrees of protection provided by enclosure (IP code) (GB 4208-
2008, IEC 60529.2001, IDT)
GB 4706.1-2005 Household and similar electrical appliances - Safety - Part
1. General requirements (IEC 60335-1.2004 (Ed4.1), IDT)
GB/T 5013.1 Rubber insulated cables of rated voltages up to and including
450/750 V - Part 1. General requirements (GB 5013.1-2008, IEC 60245-
1.2003, IDT)
GB 5023.1 Polyvinyl chloride insulated cables of rated voltages up to and
including 450/750 V - Part 1. General requirements (GB 5023.1-2008, IEC
60227-1.2007, IDT)
GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight
joints are made on the threads - Part 1. Parallel internal and taper external
threads (GB/T 7306.1-2000, eqv ISO 7-1.1994)
GB/T 7306.2 Pipe threads with 55 degree threads angle where pressure-
tight joints are made on the threads - Part 2. Taper internal and threads (GB/T
7306.2-2000, eqv ISO 7-1.1994)
GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight
joints are not made on the threads (GB/T 7307-2001, eqv ISO 228-1.1994)
GB/T 12113-2003 Methods of measurement of touch current and protective
conductor current (IEC 60990-1999, IDT)
GB/T 13611 Classification and essential property of city gas
GB 14536.1 Automatic electrical controls for household and similar use - Part
1. General requirements (GB 14536.1-2008, IEC 60730-1.2003, IDT)
GB 14536.6 Automatic electrical controls for household and similar use -
Particular requirements for automatic electrical burner control systems (GB
14536.6-2008, IEC 60730-2-5.2004, IDT)
GB 14536.10 Automatic electrical controls for household and similar use -
Particular requirements for temperature sensing controls (GB 14536.10-
2008, IEC 60730-2-9.2004, IDT)
GB/T 16411 Universal test methods of gas burning appliances for domestic
use
GB/T 17624.1-1998 Electromagnetic compatibility - General - Application
and interpretation of fundamental definitions and terms (idt IEC 61000-1-
1.1992)
GB/T 17626.1 Electromagnetic compatibility - Testing and measurement
techniques - Overview of immunity tests (GB/T 17626.1-2006, IEC 61000-4-
1.2000, IDT)
GB/T 17626.4 Electromagnetic compatibility - Testing and measurement
techniques - Electrical fast transient/burst immunity test (GB/T 17626.4-2008,
IEC 61000-4-4.2004, IDT)
GB/T 17626.5 Electromagnetic compatibility - Testing and measurement
techniques - Surge immunity test (GB/T 17626.5-2008, IEC 61000-4-5.2005,
IDT)
GB/T 17626.11 Electromagnetic compatibility - Testing and measurement
techniques - Voltage dips, short interruptions and voltage variations immunity
tests (GB/T 17626.11-2008, IEC 61000-4-11.2004, IDT)
GB/T 17627.1 High-voltage test techniques for low voltage equipment - Part
1. Definitions, test and procedure requirements (GB 17627.1-1998, eqv IEC
1180-1.1992)
GB/T 17799.1-1999 Electromagnetic compatibility - Generic standards -
Immunity for residential, commercial and light-industrial environments (idt
IEC 61000-6-1.1997)
CJ/T 3074 Electronic controller of domestic gas-fired appliances
3 Terms and definitions
For the purposes of this Standard, the following terms and definitions and those
established in GB 4706.1, GB 14536.1, GB 14536.6, GB 14536.10, GB/T 16411,
GB/T 17624.1 and CJ/T 3074 apply.
3.1
gas restrictor
Key.
a - Air supply and combustion products evacuation installation method code;
b - Heating system construction code.
5 Material, construction and safety requirements
5.1 General
Except where otherwise stated, the requirements are verified by visual
inspection of the appliance and its relevant technical documents.
5.2 Materials
5.2.1 General requirements for materials
a) During a reasonable life stated by the manufacture and under normal
conditions of installation and use, changes in its material and construction
shall not impair the safety of the appliance;
b) Materials that are in contact with gas and combustion products shall be
resistant to corrosion or subjected to corrosion resistance treatment;
c) Domestic hot water pipes shall be made of corrosion-resistant materials
and materials that do not pollute domestic hot water.
d) The thermal insulation material shall not contain asbestos, shall be of non-
combustible material, and shall withstand the expected thermal and
mechanical stresses;
e) The solder of appliances shall not contain hexavalent cadmium;
f) The enclosure of the combustion chamber shall be made of metallic
materials;
g) The important materials related to safety, the characteristics of which shall
be guaranteed by the manufacturer of the appliances and the supplier of
the materials, e.g. by providing the necessary written certification.
5.2.2 Thermal insulation materials
a) The thermal insulation material of appliances shall withstand a
temperature of at least 120 ??C without deformation and shall retain its
insulating properties under the influences of heat and ageing.
b) The thermal insulation material shall withstand the expected thermal and
mechanical stresses.
f) A filter mesh shall be fitted at the gas inlet, and the grid does not allow a 1
mm pin gauge to pass through. If the gas circuit contains a class D or D'
automatic valve, the maximum diameter of the pin gauge shall be 0.2 mm.
5.3.3.2 Soundness of combustion system
a) Parts which have to be removed during routine service and affect the
soundness of the appliance?€?s combustion system, shall be sealed by
mechanical means.
b) Where the boiler case forms part of the combustion system, there shall be
no leakage of combustion products into the room where the appliance is
installed.
5.3.4 Air supply and combustion products evacuation system
5.3.4.1 General
a) Appliances shall be designed so that there is an adequate supply of
combustion air during ignition and over the whole range of possible heat
inputs stated by the manufacturer.
b) Fan-assisted appliances may be fitted with an adjustment device in the
combustion system, either by restrictors or by setting the adjustment
device to predetermined positions in accordance with instructions from the
manufacturer, intended to adapt the appliance to the pressure losses in
the combustion products evacuation system.
5.3.4.2 Air supply and combustion products evacuation ducts
During installation of air supply and combustion products evacuation ducts, no
work is necessary other than adjusting the length (possibly by cutting them).
Such adaptation shall not impair the correct operation of the appliance.
5.3.4.3 Wind protection device
When pressing a steel ball with a diameter of 16 mm with a force of 5 N, the
ball shall not enter the wind protection device.
5.3.4.4 Fan
a) Direct access to the rotating parts of a fan shall be prevented.
b) The parts of a fan in contact with combustion products shall be able to
withstand the high temperatures of the combustion products; The parts of
a fan in contact with combustion products shall be made of corrosion
resistant material, or subjected to corrosion resistance treatment.
c) The positions of the temperature selector shall be recognizable and it shall
be possible to ascertain in which direction the water temperature rises or
falls. If numbers are used for this purpose, the highest number shall
correspond to the highest temperature.
d) At its maximum setting, it shall cause at least controlled off before the
water flow temperature exceeds 95 ??C.
5.5.4 Limit thermostat
a) The limit thermostat shall comply with the requirements of GB 14536.1 for
type I devices.
b) It shall not be possible to alter the maximum set point of the limit
thermostat.
c) When the water temperature falls below its set point, the appliance shall
restart the ignition process and resume normal operation.
d) The limit thermostat shall cause at least safety shutdown before the water
flow temperature exceeds 110 ??C.
5.5.5 Overheat cut-off device
a) T...