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GB 25034-2010

Chinese Standard: 'GB 25034-2010'
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BASIC DATA
Standard ID GB 25034-2010 (GB25034-2010)
Description (Translated English) Gas-fired heating and hot water combi-boilers
Sector / Industry National Standard
Classification of Chinese Standard P46
Classification of International Standard 91.140.99
Word Count Estimation 72,786
Date of Issue 2010-09-02
Date of Implementation 2011-07-01
Quoted Standard GB/T 191; GB/T 1019-2008; GB/T 2828.1; GB/T 2828.2; GB 4208; GB 4706.1-2005; GB/T 5013.1; GB 5023.1; GB/T 7306.1; GB/T 7306.2; GB/T 7307; GB/T 12113-2003; GB/T 13611; GB 14536.1; GB 14536.6; GB 14536.10; GB/T 16411; GB/T 17624.1-1998; GB/T 17626.1; GB/T 17626.4; GB/T 17626.5; GB/T 17626.11; GB/T 17627.1; GB/T 17799.1-1999; CJ/T 3074
Adopted Standard EN 483-1999, MOD; EN 625-1996, MOD
Drafting Organization Guangzhou Devotion Domestic Boilers Manufacturing Co., Ltd.
Administrative Organization Ministry of Housing and Urban standard technical focal point of city gas
Regulation (derived from) Announcement of Newly Approved National Standards No. 4 of 2010 (total 159)
Proposing organization Ministry of Housing and Urban-Rural Development of the People's Republic of China
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This Chinese standard applies to the rated heat input less than equal to 70 kW, maximum heating working pressure less than or equal 0. 3 MPa, working temperature of not more than 95��C, using atmospheric burners or fan -assisted burner or premix burners heating and hot water dual-use equipment, but also for single- heating apparatus.

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) The overheat cut-off device shall comply with the requirement of GB
14536.1 for type II devices.
b) This device shall cause non-volatile lockout before the appliance is
damaged or before a dangerous situation for the user occurs.
c) This device shall not be adjustable and normal operation of the appliance
shall not give rise to a change in its set point temperature.
d) Interruption of the link between the sensor and the device responding to
its signal shall cause at least safety shutdown.
5.5.6 Safety temperature limiter
a) The safety temperature limiter shall comply with the requirements of GB
14536.1 for type II devices.
b) In addition to the requirements stated in 5.5.5, the safety temperature
limiter shall cause non-volatile lockout before the water flow temperature
exceeds 110 °C.
5.5.6 Temperature sensors
Thermostats, limit thermostats, overheat cut-off devices and safety temperature
input less than the rated heat input, the ignition heat input shall not exceed the
rated value specified by the manufacturer.
6.3.4 Heating rated heat output
Under the test conditions of 7.3.4, the heating heat output shall be greater than
or equal to the heating rated heat output.
6.3.5 Hot water rated heat input
Under the test conditions of 7.3.5, the rated hot water heat input shall be
reached, or it may be adjusted to be within ±10 % of the rated hot water heat
input.
6.3.6 Hot water production rate
Under the test conditions of 7.3.6, the measured value of the hot water
production rate shall not be lower than 95 % of the nominal value of the
manufacture.
6.4 Safety of operation
6.4.1 Surface temperature rise
6.4.1.1 Surface temperature rise of adjusting, control and safety devices
Under the test conditions of 7.4.1.1, the surface temperature rise of adjusting,
control and safety devices shall not exceed the value specified by the
manufacturer and their operation shall remain satisfactory. For the control
knobs and all the parts that have to be touched during normal use, the surface
temperature rise of metal parts shall be less than or equal to 35 K; the surface
temperature rise of porcelain parts shall be less than or equal to 45 K; the
surface temperature rise of plastic parts shall be less than or equal to 60 K.
6.4.1.2 Surface temperature rise of side, front and top of appliances
Under the test conditions of 7.4.1.2, the surface temperature rise of side, front,
and top of appliances, other than parts of the case within 5 cm of the edge of
the sight glass, and within 15 cm of the combustion products evacuation duct,
shall be less than or equal to 80 K.
6.4.1.3 Surface temperature rise of test panel and installation base panel
Under the test conditions of 7.4.1.3, the surface temperature rise of test panels
and installation base panels shall be less than or equal to 80 K. When the
installation base panel and the wall body are composed of flammable materials,
and the surface temperature rises to 60 K to 80 K, the manufacture shall provide
correctly when the fan stops during the standby time.
6.5 Adjusting, control and safety devices
6.5.1 Basic requirements
Under the test conditions of 7.5.1, the devices shall operate correctly at the
maximum temperature and when the voltage is varied between 0.85 times and
1.1 times the rated voltage. For voltages below 0.85 times the rated voltage,
the devices shall either continue to assure safety or cause safety shutdown.
6.5.2 Control devices
6.5.2.1 Rotary knob
Under the test conditions of 7.5.2.1, the torque of a rotary knob shall be less
than or equal to 0.6 N • m.
6.5.2.2 Push-button
Under the test conditions of 7.5.2.2, the force required to open and/or close the
push-button shall be less than or equal to 45 N.
6.5.3 Automatic valves
6.5.3.1 Sealing force
Under the test conditions of 7.5.3.1, the leakage rate of class B and class C
valves shall meet the requirements of Table D.1 in Annex D.
6.5.3.2 Closing function
Under the test conditions of 7.5.3.2, the closing function of valves shall meet
the following requirements.
a) The valves shall close automatically before the voltage reaches 0.15 times
the minimum rated voltage.
b) The valves shall close automatically on interruption of the electricity supply
when the electrical supply voltage is between 0.15 times the minimum
rated voltage and 1.1 times the maximum rated voltage.
c) For pneumatic or hydraulic valves, the valves shall close automatically
when the actuating pressure is reduced to 0.15 times the maximum rated
actuating pressure specified by the manufacturer.
6.5.3.3 Closing time
concentration in the combustion products shall not exceed 0.10 %.
c) Under the test conditions of 7.5.8.3 c), the gas supply shall be shut off
before the COα-1 concentration in the combustion products exceeds
0.20 %.
d) Under the test conditions of 7.5.8.3 d), at thermal equilibrium, the COα-1
concentration in the combustion products shall not exceed 0.10 %.
6.5.8.4 Gas/air ratio controls
6.5.8.4.1 Endurance of gas/air ratio controls
Under the test conditions of 7.5.8.4.1, gas/air ratio controls are subjected to an
endurance test of 250000 cycles with full diaphragm travel in each cycle. After
the endurance test, the gas/air ratio control shall operate correctly.
6.5.8.4.2 Leakage of non-metallic control tubes
Under the test conditions of 7.5.8.4.2, use control tubes that are not made of
metal or of other materials with at least equivalent properties, their breakage or
leakage shall not lead to an unsafe situation.
6.5.8.4.3 Adjustability of air/gas or gas/air ratio controllers
Under the test condition of 7.5.8.4.3, the adjustable device shall work normally
under the extreme pressure and within the adjustable ratio range.
6.5.8.4.4 Safety of operation
The appliance shall meet one of the following requirements.
a) Under the test conditions of 7.5.8.4.4 a), it shall meet the following
requirements.
1) when the heat input is higher than the maximum value of the adjustment
range specified by the manufacturer, the gas supply shall be shut off
before the COα-1 concentration in the combustion products exceeds
0.20 %;
2) When the heat input is below than the minimum value of the adjustment
range specified by the manufacturer, the gas supply shall be shut off
before the COα-1 concentration in the combustion products exceeds
థౣ౟౤ ൈ CO୫ୣୱ ≤ 0.20 %.
where. Φ is the instantaneous heat input, Φmin is the minimum heat
input, COmes is the measured CO concentration.
a) Test 1. CLOSE the first valve of the gas circuit, OPEN all downstream
valves for soundness, APPLY air of 15 kPa to the gas inlet, CHECK
whether the requirement of 6.2.1 is met.
b) Test 2. OPEN the first valve of the gas circuit, CLOSE the second valve
for soundness of the gas circuit, BLOCK the ignition burner gas circuit.
APPLY air of 5 kPa (not using liquefied petroleum gas) or 15 kPa (using
liquefied petroleum gas) to the gas inlet. CHECK whether the requirement
of 6.2.1 is met. All the closing devices of the ignition burner are subjected
to the same test.
c) Test 3. OPEN the first valve of the gas circuit, CLOSE the second valve of
the gas circuit, CLOSE or BLOCK the ignition burner gas circuit. The
pressure of the gas inlet is 0.6 kPa. CHECK whether the requirement of
6.2.1 is met.
d) Test 4. OPEN all valves for soundness, REPLACE the injectors with the
appropriate parts provided by the manufacturer to block the gas circuit.
CHECK the leakage or CHECK whether the requirements of 6.2.1 is met
with 0-1 gas flame.
7.2.2 Soundness of combustion system
7.2.2.1 General
The test uses all the joints specified by the manufacturer under air at room
temperature. The tests are carried out with the maximum possible leakage of
the appliance.
7.2.2.2 Air supply and combustion products evacuation system
The body and the air supply and combustion products evacuation duct of the
appliance shall be tested separately, or the air supply and combustion products
evacuation duct shall be mounted on the appliance for overall test.
One end of the gas circuit of the test appliance is connected to the pressure
source and the other end is blocked. The test pressure shall be as specified by
the supplier but not less than 50 Pa. For appliances with fans and separate air
supply and combustion products evacuation ducts, the test pressure is the
pressure difference between the internal pressure of the combustion products
evacuation duct and the atmospheric pressure at thermal equilibrium of the
appliance (fitted with the longest air supply and combustion products
evacuation duct specified by the manufacturer). It is checked that the
requirements of 6.2.2.2 are met.
7.2.2.3 Combustion products evacuation duct for indirect control method
According to the test method of 7.3.1. MEASURE the total heat input during the
ignition safety time, CALCULATE the heat input per unit time. It is checked that
the requirements of 6.3.3 are met.
7.3.4 Heating rated heat output
The thermal efficiency of the test method in 7.7.1 is multiplied by the rated heat
input as the heating heat output. It is checked that the requirements of 6.3.4
are met.
7.3.5 Hot water rated heat input
USE 0-2 gas. For rapid heat exchange appliances, the gas rate can be adjusted
according to the manufacturer's instructions. When the rated hot water heat
input is in equilibrium state, the gas rate is measured and calculated according
to formulae (1) and (2). It is checked that the requirements of 6.3.5 are met.
7.3.6 Hot water production rate
USE 0-2 gas. ADJUST the temperature of hot water to 30 K ± 1 K. When it
cannot be adjusted to this temperature, adjust it to the nearest temperature.
The appliance with automatic thermostatic function shall set the temperature at
the maximum temperature; by means of increasing the inlet water pressure,
make the appliance operate at rated heat input or maximum heat input. When
the rated hot water heat input is in equilibrium state, the test is started. For
volumetric appliances, make the appliance operate in hot water mode, adjust
the thermostat to the temperature of 65 °C or the nearest temperature. When it
cannot be adjusted to this temperature, adjust it to the nearest temperature.
When the burner is extinguished, start draining the water, and the end of the
first drainage cannot be earlier than the second extinction of the burner and
shall last for 10 min. The test shall be conducted twice in a row. Record cold,
hot water temperature and water rate. After the appliance is operating for 20
min, a second 10-min water drainage is performed, and the temperature and
water rate are recorded. Calculate each drainage according to formula (3).
where.
Di - the value of the effective rate at a temperature rise of 30 K per
measurement, in liters per minute (L/min);
Mi(10) - the value of the amount of water measured each time during the test,
in liters (L);
Figure 7 -- Test rig with horizontal duct installed on a vertical wall
7.4.2.3 Ignition stability of ignition burner at low rate
Use reference gas for test.
a) For appliances without a governor or with a gas/air ratio control, the gas
inlet is set to the minimum pressure.
b) For appliances equipped with a governor, the outlet pressure is adjusted
to.
- Artificial gas. the corresponding value of 90 % of the rated heat input;
- Natural gas. the corresponding value of 92.5 % of the rated heat input;
- Liquefied petroleum gas. the corresponding value of 95 % of the rated
heat input.
Reduce the gas rate of the ignition burner to the minimum gas rate that
maintains its normal operation. It is check that the requirements of 6.4.2.3 are
met.
If ignition is possible under the above conditions, the test is repeated with the
minimum heat input allowed by the controller.
7.4.3 Reduction of gas pressure
With the boiler installed as stated in 7.1.3, the gas supply pressure is reduced,
in 100 Pa steps, from 70 % of the rated pressure to 0 mbar. At each step it is
checked that the requirements of 6.4.3 are met or that at least safety shutdown
occurs.
7.4.4 Failure of the gas shut-off valve near the main burner
If the gas supply to the ignition burner is taken between the two automatic
valves of the main burner, the gas shut-off valve near the main burner is kept
open artificially. Use 0-2 gas or the actual gas at the rated pressure to ignite the
small fire burner. It is checked that the requirements of 6.4.4 are met.
7.4.5 Pre-purge
7.4.5.1 Pre-purge volume and pre-purge time
According to the option chosen by the manufacturer, the pre-purge volume or
the pre-purge time are tested according to the following methods.
The composition and sealing force requirements of automatic gas valves are
given in Annex D.
7.5.3.1 Sealing force
The valves are first opened and closed twice. After turning off the power, apply
air under the pressure as shown in Table D.1 in Annex D in the opposite
direction to the closing direction of the closure element. The air pressure
increase speed is not more than 0.1 kPa/s. After the pressure is stable, test the
leakage volume. It is checked that the requirements of 6.5.3.1 are met.
7.5.3.2 Closing function
a) The valve is energized at the maximum rated voltage and the maximum
actuating pressure, and the voltage is slowly reduced to 0.15 times the
minimum rated voltage. It is checked that the valve is closed.
b) The valve is energized at the rated voltage, then the voltage adjusted to
1.1 times the maximum rated voltage and the maximum actuating
pressure (pneumatic and hydraulic valves) and remains unchanged. After
being de-energized, it is checked that the valve is closed. For valves
having control solenoids for alternating current, the electricity supply shall
be switched off at a peak value of the alternating current.
c) The valve is energized at the maximum rated voltage, then the voltage is
reduced to between 0.15 times the minimum rated voltage and 0.85 times
the maximum rated voltage. The actuating pressure remains unchanged.
Select 3 different points between 0.15 times the minimum rated voltage
and 0.85 times the maximum rated voltage for the tests, to see whether
the above requirements are met.
d) A valve with a pneumatic or hydraulic actuating mechanism is energized
at the maximum rated voltage and the maximum actuating pressure; then
the actuating pressure is slowly reduced to 0.15 times the maximum
actuating pressure. It is checked that the valve is closed.
It is checked that the requirements of 6.5.1 and 6.5.3.2 are met.
7.5.3.3 Closing time
The valve is operated at the maximum actuating pressure or 1.1 times the rated
voltage; the air corresponding to the maximum working pressure of the
appliance and 0.6 kPa is used respectively; the interval between interruption of
the pneumatic, hydraulic pressure or electrical voltage and the valve reaching
the closed position is measured. It is checked that the requirements of 6.5.1
and 6.5.3.3 are met.
7.5.6.1 Voltage regulation performance test
Use 0-2 gas, adjust the appliance to rated heat input. Then adjust the gas
supply pressure to. minimum pressure and maximum pressure.
It is checked that the requirements of 6.5.6.1 are met.
7.5.6.2 Endurance
The air is supplied at ambient temperature and at the maximum pressure
specified by the manufacturer. A quick acting shut-off valve is fitted both
upstream and downstream of the gas governor. The two valves alternately open
and close. With 10 s for each cycle, in each cycle the diaphragm is fully flexed
and the valve is held on its seat for at least 5 s.
50000 tests are allocated according to the following conditions.
- 25000 tests are at the maximum working temperature specified by the
manufacturer but at least 60 °C,
- 25000 tests are at the maximum working temperature specified by the
manufacturer but at most 0 °C.
After the test, it shall meet the requirements of 6.5.6.2.
7.5.7 Thermostats and water temperature limiting devices
7.5.7.1 Basic requirements
If the thermostat and the water temperature limiting device are tested separately,
the sensor and thermostat shall be placed in a thermostatically controlled
enclosure. The test conditions of the thermostat body shall be as specified in
7.5.1 and the test conditions of the sensor shall be as specified in 7.5.7.2b).
7.5.7.2 Control thermostat
a) Adjustment accuracy
The appliance is installed as stated in 7.1.3 and adjusted to the rated heat
input with 0-2 gas or an actually distributed gas. Using control valve I in
Figures 3 or 4, the cold water rate is adjusted to give a rate of increase of
the flow temperature of about 2 K/min.
When the thermostat is adjustable, two tests are carried out at the
maximum setting temperature, and at the minimum temperature.
Under these test conditions, the appliance is started at ambient
For gas/air controllers that can be adjusted automatically, test at their maximum
and minimum ratios. It is checked that the requirements of 6.5.8.4.3 are met.
7.5.8.4.4 Safety of operation
The appliance is set at the rated heat input, and after reaching thermal
equilibrium. The CO and CO2 or O2 contents are measured continuously. By
choice of the manufacturer one of the following tests is conducted.
a) The air supply duct or combustion products evacuation duct is
progressively blocked (the means of carrying out the blockage shall not
give rise to recirculation of the products of combustion). It is checked that
the requirements of 6.5.8.4a) are met.
b) With the appliance at ambient temperature, the maximum blockage of the
air supply duct or combustion products evacuation duct which enables the
burner to ignite, is established (the means of carrying out the blockage
shall not give rise to recirculation of the products of combustion). The
appliance is operated until thermal equilibrium is reached. It is checked
that the requirements of 6.5.8.4b) are met.
c) The working voltage at the fan terminals is progressively reduced. It is
checked that the requirements of 6.5.8.4c) are met.
d) With the appliance at ambient temperature, the minimum working voltage
at the fan terminals which enables the burner to ignite, is established. The
appliance is operated until thermal equilibrium is reached. It is checked
that the requirements of 6.5.8.4d) are met.
7.6 Combustion test
7.6.1 General
The tests are carried out with the longest air supply and combustion products
evacuation ducts, or with the corresponding pressure losses, unless otherwise
stated. The appliance is supplied with 0-2 gas and adjusted at the rated heat
input. The CO and CO2 or O2 contents of combustion products are measured
in thermal equilibrium. When dry, excess air coefficient α = 1, the content of CO
in combustion products is calculated by formula (5) or formula (6).
where.
(CO)m - the value of the CO content of the sampling test, in volume fraction
c) appliances with gas governors or appliances which are intended to be
installed solely on a gas installation with a gas governed meter are
adjusted to 105 % of the rated heat input.
The reference gas is then replaced by the incomplete combustion limit gas. It
is checked that the requirements of 6.6.3.1 are met.
7.6.3.2 Flame lift combustion
First the reference gas is used to adjust the heat input state as follows.
a) appliances without gas governors are adjusted to the minimum heat input;
the pressure at the boiler inlet is the minimum pressure;
b) appliances with gas/air ratio controls are adjusted to the minimum heat
input;
c) appliances with gas governors are adjusted to a heat input equal to 95 %
of the minimum heat input.
The reference gas is then replaced by the flame lift limit gas. It is checked that
the requirements of 6.6.3.2 are met.
7.6.3.2 Fan assisted combustion
The appliance tests are performed according to 7.4.2.2a). Calculate the
arithmetic mean value of COα=1 in the combustion products measured under
the nine combinations of wind speed and incident angle. It is checked that the
requirements of 6.6.3.3 are met.
7.6.4 Sooting
The test conditions are the same as those in 7.6.3.1. After using incomplete
combustion limit gas to continuous operate for 0.5 h, it is checked that the
surface of the heat exchanger meets the requirements of 6.6.4.
7.7 Thermal efficiency test
7.7.1 Heating thermal efficiency at rated heat input
7.7.1.1 Test conditions
The appliances are installed as stated in 7.1.3, connected to the insulated test
rig shown in Figures 3 or 4, or to any other equipment giving equivalent results.
The appliances are supplied with 0-2 gas. The measurement of the efficiency
may begin once the appliance, with the control thermostat put out of action, is
- For appliances with adjustable rated heat input, the thermal efficiency is
tested at the maximum heat input Qn and at the arithmetic mean value Qa
of the maximum rated heat input and the minimum rated heat input,
respectively.
The tested thermal efficiency shall meet the requirements of 6.7.1.
NOTE. Practical test method for Dp.
- Use a well-insulated, small-volume (approx. 250 mL) container as an alternative to the
appliance (1) (see Figure 3), which has a submerged electric heater inside. The circulation
system is filled with water; the water pump is started to work under normal settings; the
submerged electric heater is connected with the adjustable transformer, the wattmeter and
the power supply; the adjustable transformer is adjusted so that the circulating water
temperature reaches the thermal equilibrium (this process takes 4 h or for a longer time);
record the ambient temperature and measure the heat input. Performing a series of tests
at different temperatures, so as to obtain the heat losses at different temperatures above
ambient temperature.
- During the actual measurement, the ambient temperature is recorded at the same time,
and the heat loss Dp is determined according to the difference between the ambient
temperature and the average temperature of the test platform.
7.7.2 Heating thermal efficiency at reduced load
7.7.2.1 General
The thermal efficiency of the test fixture when the load is 30% of the rated heat
input; for the rated heat input adjustable appliance, the load is the thermal
efficiency when the maximum rated heat input is 30% of the average value of
the minimum rated heat input arithmetic.
Test the thermal efficiency of the appliance at a load corresponding to 30 % of
the rated heat input; for range rated appliances, test at a load corresponding to
30 % of the arithmetic mean of the maximum and minimum heat input.
7.7.2.2 Direct method
The appliance is installed as stated in 7.1.3 and supplied with 0-2 gas; at rated
heat input.
Taking into account temperature variations, throughout the test, the water
volume rate is maintained constant within ±1 %, and the pump operates
continuously.
7.7.2.2.1 Test method 1
USE 0-2 gas, under the rated heat input, START the hot water system and
gradually REDUCE the water supply pressure until the burner is extinguished.
Continuously MEASURE the maximum temperature of domestic hot water with
a low-temperature inert thermometer, CHECK whether the requirements of
6.8.3 are met.
7.8.3.2 Water-storage heat exchange type
USE 0-2 gas, ADJUST the hot water thermostat to the highest position so that
the domestic hot water runs under the rated heat load. After the burner is
extinguished, DISCHARGE the domestic hot water and MEASURE the
maximum domestic hot water temperature, CHECK whether the requirements
of 6.8.3.2 are met.
7.8.4 Water supply shut-off temperature rise
7.8.4.1 For rapid heat exchange type, use 0-2 gas, make the appliance operate
at the rated heat load, adjust the water rate or water temperature control device
so that the domestic hot water is at the maximum water temperature. After the
appliance is operating for 10 min, immediately turn off the hot water inlet switch
and open it after 10 s. At as close as possible to the hot water outlet, use a low-
temperature inert thermometer to continuously measure the outlet water
temperature at the center of the water flow until the temperature of the outlet
hot water is stable. Read the maximum temperature. Then test following the
above steps, but the drainage stop time is increased by 10 s each time. Until
the maximum temperature is reached. It is checked that the requirements of
6.8.4.1 are met.
7.8.4.2 Water-storage heat exchange type
Use 0-2 gas, adjust the thermostat to the maximum temperature position and
operate at rated thermal load. After the water tank reaches a stable temperature
and the burner is turned off by the control device for 1 s, the water tank is
drained at a rate of 5 %. Until the burner reignites and operates at least 95 %
of the rated heat input, record the maximum outlet water temperature. After the
burner is extinguished, immediately drain again and repeat the above test until
the water temperature does not rise again. Record the maximum water
temperature. It is checked that the requirements of 6.8.4.2 are met.
For burners with adjustable heat input or several rates, the next drain shall be
performed when the gas rate is reduced to 50 % of full load. Every time the
water is drained, record the maximum outlet water temperature. It is checked
that the requirements of 6.8.4.2 are met.
7.8.5 Domestic hot water overheat
USE 0-2 gas, SET the temperature of the heating circuit to the highest position.
In the heating mode, OPERATE continuously for 1 h with rated heat input
without discharging hot water. Then the water is discharged at the nominal hot
water production rate. It is checked that the requirements of 6.8.5 are met.
7.8.6 Heating time
According to the requirements of 7.8.1, the rapid heat exchange hot water
system shall be operated using 0-2 gas at a pressure of 0.1 MPa, so that the
appliance is operating under the rated heat input condition of domestic hot
water. SET the outlet hot water temperature higher than the inlet temperature
by 40K. After operating for 5 min, STOP the gas supply. The water still flows.
RESTART the appliance until the inlet and outlet water temperatures are equal.
MEASURE the time required to reach a temperature rise of 36 K to the hot
water from the ignition of appliance. It is checked that the requirements of 6.8.6
are met.
7.8.7 Water temperature control
7.8.7.1 Rapid heat exchange type
Use 0-2 gas as required by 7.8.1, make the appliance operate at rated heat
input. The water shall be drained under water pressure of 0.1 MPa, 0.2 MPa,
0.3 MPa and 0.6 MPa or water pressure specified by the manufacturer. When
the steady state is reached, if the heating thermostat can be adjusted, drain
water at the maximum and minimum positions, respectively. It is checked that
the requirements of 6.8.7.1 are met.
7.8.7.2 Water-storage heat exchange type
Adjust the water temperature of the water tank according to the manufacturer's
specifications. After the appliance burner is controlled off, drain the hot water
for 10 minutes at a rate of 5 % of the tank volume per minute or the minimum
rate stated by the manufacturer. At this time, the burner is allowed to start when
the drainage is done at a rate greater than 5 % of the water tank volume. After
1 min, it is checked that the requirements of 6.8.7.2 are met.
7.9 Hydraulic resistance test
When testing the hydraulic resistance of an appliance (in kPa), the rate of the
test water shall correspond to the appliance operating under the rated heat
input state, the outlet water temperature is 80 °C, the return water temperature
60 °C or at a value specified by the manufacturer.
The test is carried out with the water at ambient temperature.
b) Thermostat and water temperature limiting device function (6.5.7, except
for endurance);
c) CO content in incomplete combustion (6.6.3.1);
d) Functional test for air proving device (6.5.8, except for durability);
e) Verification of safety shut-off function (6.5.3.2);
f) Verification of safety time (6.4.5.1);
g) Domestic hot water performance (6.8);
h) Soundness of combustion system (6.2.2);
i) Leakage current (for appliances using AC power) (E.6.2, E.8.2).
8.1.2.3 Products that have been in stock for more than 1 year shall be re-
inspected in accordance with 8.1.2.
8.2 Type inspection
8.2.1 Type inspection requirements
In the case of one of the following situations, the type inspection shall be carried
out. After the type inspection is passed, mass production and sales are allowed.
a) Trial model design appraisement of new product;
b) Trial model design appraisement of the product manufactured from a
factory to another factory;
c) After the formal production, if there are major changes in the structure,
materials and processes, which may affect the product performance;
d) Resume production after the production has been suspended for a long
time;
e) When there is a big difference between the factory-exit inspection result
and the last type inspection result;
f) When the national quality supervision agency requires the type inspection.
8.2.2 Inspection items
In this Standard, Clause 5, Clause 6, Clause 9 and 10.1.
8.2.3 Determination principles
l) the IP code of water resistance class;
m) the rated heat input (Qnw) of domestic hot water mode, the unit. kW (if
there is different heat input for heating and domestic hot water).
9.1.2 Packaging markings
The packaging box shall carry the name, type, mass, dimension, applicable gas
type, area of use and gas supply pressure of the appliance; the name and
address of the manufacturer, the date of manufacture; the pictorial marking for
handling of goods that complies with the specifications of GB/T 191.
9.2 Warnings
9.2.1 Warning signs
Appliances shall have striking special warning signs, which shall be firm and
durable, and shall include the following contents.
a) Gas other than those specified shall not be used;
b) Ventilation requirements and installati......
Related standard: GB 25034-2020    GB 50041-2020
Related PDF sample: GB/T 21087-2007    CJ/T 395-2012