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GB/T 36699-2018 (GB/T36699-2018)

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GB/T 36699-2018: PDF in English (GBT 36699-2018)
GB/T 36699-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.060.30
J 98
Specification for liquid-fuels and
gaseous-fuels burners of boilers
ISSUED ON. SEPTEMBER 17, 2018
IMPLEMENTED ON. APRIL 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4 
Introduction ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 8 
4 Classification and preparation of model ... 13 
5 Composition and basic configuration ... 15 
6 Basic requirements ... 19 
7 Performance requirements ... 20 
8 Design and manufacturing ... 29 
9 Special requirements ... 36 
10 Inspection, testing and detection ... 38 
11 Technical documents and markings ... 41 
12 Packaging, transportation and storage ... 42 
13 Installation, commissioning and use ... 43 
Appendix A (Normative) Basic configuration of burner ... 47 
Appendix B (Normative) Requirements for arrangement of safety shut-off valve
of liquid-fuel burner ... 53 
Appendix C (Normative) Opening requirements of safety shut-off valve of main
gas ... 59 
Appendix D (Normative) Measurement and correction of emissions ... 63 
Appendix E (Informative) Measurement of flue-gas’s blackness ... 67 
Appendix F (Normative) Control timing diagram of liquid-fuel and gaseous-fuel
burner ... 69 
Appendix G (Normative) Conditions of type test ... 70 
Appendix H (Normative) Type test, exit-factory inspection, post-modification
inspection, in-use detection items ... 80 
Appendix I (Normative) Type test, exit-factory inspection, in-use test method
... 81 
Specification for liquid-fuels and
gaseous-fuels burners of boilers
1 Scope
This standard specifies the technical requirements for the classification and
model preparation, composition and basic configuration, basic requirements,
performance requirements, design and manufacture, inspection, testing and
detection, technical documentation and identification, packaging, transportation
and storage, installation, commissioning, use of liquid-fuels and gaseous-fuels
burners of boilers.
This standard applies to forced draught burners and natural ventilation burners
which use the liquid-fuels and gaseous-fuels for boilers. Power plant boiler’s
startup burners, various industrial furnaces, industrial heating furnaces, burners
for other purposes may make reference to this standard.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 1184 Geometrical tolerancing - Geometrical tolerance for features
without individual tolerance indications
GB/T 1804 General tolerances - Tolerances for linear and angular
dimensions without individual tolerance indications
GB/T 4208 Degrees of protection provided by enclosure (IP code)
GB/T 6414 Castings - Dimensional tolerances and geometrical tolerances
and machining allowances
GB/T 13384 General specifications for packing of mechanical and electrical
product
GB/T 13611 Classification and essential property of city gas
GB/T 14486-2008 Dimensional tolerances for molded plastic parts
GB/T 14536.1 Automatic electrical controls for household and similar use -
Part 1. General requirements
GB/T 14536.6 Automatic electrical controls for household and similar use -
Particular requirements for automatic control systems for burners
GB/T 14536.7 Automatic electrical controls for household and similar use -
Special requirements for pressure-sensitive electrical automatic controllers,
including mechanical requirements
GB 16663 Alcohol base liquid-fuel
GB 18613 Minimum allowable values of energy efficiency and energy
efficiency grades for small and medium three-phase asynchronous motors
GB/T 19212.4 Safety of transformers, reactors, power supply units and
combinations thereof - Part 4. Particular requirements and tests for gas and
oil burners, ignition transformers
GB 19517 National safety technical code for electric equipments
GB/T 19804 Welding - General tolerances for welded constructions -
Dimensions for lengths and angles - Shape and position
GB/T 24146 Rubber hoses and hose assemblies for use in oil burners -
Specification
GB 25989 Fuel oils for burners
GB/T 30597 General requirements of safety and control devices for gas
burners and gas-burning appliances
JB/T 10562 Technical specification for general purposes axial fans
JB/T 10563 Technical specification for general purposes centrifugal fans
TSG G0001 Boiler safety technical supervision administration regulation
ISO 23551-1 Safety and control devices for gas burners and gas-burning
applications - Particular requirements - Part 1. Automatic and semi-
automatic valves
ISO 23551-2 Safety and control devices for gas burners and gas-burning
appliances - Particular requirements - Part 2. Pressure regulators
ISO 23551-3 Safety and control devices for gas burners and gas-burning
appliances - Particular requirements - Part 3. Gas/air ratio controls,
pneumatic type
Gaseous-fuel
A gaseous combustible substance that generates heat when burned.
Note. The gaseous-fuels referred to in this standard include natural gas,
liquefied petroleum gas, coke-oven gas, mixed city gas, bio-gas, low-
calorific-value gas, combustible industrial tail-gas, hydrogen gas, methane.
3.6
Biomass pyrolysis gas
A low-calorific-value combustible gas produced by a pyrolysis process of a
biomass solid fuel.
3.7
Dual fuel burner
A burner capable of burning liquid and/or gaseous-fuel simultaneously or
separately.
3.8
Surface burner
A fully-premixed burner in which fuel is burned on the surface of a porous
medium.
3.9
Heat output
The amount of heat as released by the burner per unit time.
Note. The heat output referred to in this standard is based on the net calorific
value of the fuel, in the unit of kilowatt (kW).
3.10
Nominal heat output
The heat as released by the burner during continuous combustion per unit
time under rated conditions.
Note. The nominal heat output is expressed in QF, in kilowatts (kW).
3.11
Maximum heat output
Flame detector device
A device for monitoring the presence of a flame.
3.19
Main flame
A flame that burns on the main combustion nozzle.
3.20
Ignition flame
The flame that is first ignited to ignite the main flame.
3.21
Controlled shutdown
When the burner does not need to supply heat, the process of shut-down by
automatically cutting off the fuel supply.
3.22
Safety shutdown
After the safety device responds or the automatic control system fails, the
process of shut-down by automatically cutting off the fuel supply.
3.23
Pre-ignition time
The time interval between the startup of discharge of the ignition electrode
and the opening of the fuel valve.
Note. The pre-ignition time is expressed in ty, in seconds (s).
3.24
Ignition safety time
The safe time for the burner’s ignition flame to ignite, that is, when the
ignition flame is not formed, the interval between the time when the ignition
fuel control valve gets the opening signal and the time when it gets the
closing signal.
Note. The ignition safety time is expressed in ts, in seconds (s).
The ratio of the actual amount of supplied air to the amount of theoretical air.
3.31
Working diagram
A curve which represents the relationship between the combustion
chamber’s pressure and the heat output, whose enveloped zone is the
working range as designed for the burner.
3.32
Original emission
Emission concentration of combustion products without any treatment
determined under type test conditions.
Note. The original emission concentration is converted according to the
oxygen content of the flue-gas of 3.5%, in milligrams per cubic meter
(mg/m3).
3.33
In service burner modification
The behavior of making major changes to the type of fuel, internal structure,
combustion method of the burner.
4 Classification and preparation of model
4.1 Classification
The burners are divided according to the type of fuel used, the mode of
adjustment, the mode of air supply, the method of atomization, the type of
structure, as follows.
a) According to the type of fuel used, it is divided into liquid-fuel burners,
gaseous-fuel burners, dual (multi) fuel burners;
b) According to the heat output’s control mode, it is divided into single-stage
control burner, multi-stage control burner, modulating control burner;
c) According to the air supply mode of combustion air, it is divided into forced
draught burners and natural ventilation burners;
d) According to the atomization mode of the liquid-fuel, the liquid-fuel burner
is divided into mechanical-atomization burner and medium-atomization
burner;
a) A single-stage control burner shall be provided with one safety shut-off
valve, as shown in Figure B.1;
b) A two and multi-stage control burner shall be provided with a safety shut-
off valve for each nozzle, as shown in Figure B.2;
c) The burner which uses the return nozzle shall be provided with a safety
shut-off valve on the fuel supply pipeline and the fuel return pipeline, which
are linked. It may use a nozzle shut-off valve to replace the safety shut-off
valve, as shown in Figure B.3 and Figure B.4.
5.2.2.2 For liquid-fuel burners which have a nominal heat output > 400 kW, it
shall install two automatic safety shut-off valves in serial connection on the fuel
pipeline. The upstream safety shut-off valve shall be of the quick-closing type,
the downstream safety shut-off valve may also be used as the flow control valve
simultaneously. The closing time shall not exceed 5 s. The automatic safety
shut-off valve shall be arranged in accordance with the requirements of Figure
B.5 ~ Figure B.7. The specific requirements are as follows.
a) The two and multi-stage control burners shall be equipped with two safety
shut-off valves for each nozzle, as shown in Figure B.5;
b) Burners which use return nozzles shall be fitted with two safety shut-off
valves, respectively, on the fuel supply pipeline and the fuel return pipeline.
One of the safety shut-off valves may be replaced by a nozzle shut-off
valve, which shall comply with the requirements of ISO 23553-1. The
return pipeline shall be fitted with a pressure monitoring device, as shown
in Figure B.6 and Figure B.7. The safety shut-off valve shall be linked.
When the safety shut-off valve on the fuel supply pipeline is opened, the
safety shut-off valve on the return pipeline cannot be closed. It can be
realized by the following two methods.
1) A mechanical connection controlled by the actuator between the safety
cut-off valve on the supply pipeline and the safety shut-off valve on the
return pipeline;
2) An electrical or pneumatic interlocking between the safety cut-off valve
on the supply pipeline and the safety shut-off valve on the return pipeline.
If the burner has a circulating preheating nozzle head, it shall make the fuel
circulate to the nozzle head. When there is only one nozzle shut-off valve, the
nozzle shut-off valve shall meet the requirements of ISO 23553-1, otherwise it
shall take other measures to ensure that the fuel does not ejected during
circulated heating. At the same time, it shall also ensure that the return pressure
will not open the nozzle shut-off valve.
5.2.3 Automatic safety shut-off valve for gaseous-fuel
A gas leak detector which has a nominal heat output greater than 1200 kW shall
be provided with a valve leak detector.
6 Basic requirements
6.1 Declaration of conformity
This standard has been developed in accordance with the basic safety
requirements for the liquid-fuel burner and the gaseous-fuel burner in TSG
G0001.
6.2 Manufacturing organization
The manufacturing organization of the burner shall meet the following
conditions simultaneously.
a) The production equipment and production sites that are compatible with
the scale of production;
b) The basic test and detecting device of the burner;
c) The technicians and professional commissioning personnel related to the
thermal energy and electrical control trades;
d) The sound quality management system and corresponding management
policies.
6.3 Professionals
Professionals involved in such trades as manufacture, installation,
commissioning, repair, modification of burners shall have expertise in thermal
energy and electrical control, be familiar with the operation and commissioning
process.
6.4 Type test
6.4.1 Burners shall be subjected to the type test under one of the following
conditions.
a) A newly-designed burner;
b) Where the fuel types used by the burner or the structure and
programmable control methods of burner change;
c) The last type test of the burner is more than 4 years.
6.4.2 The type test shall be carried out by an inspection and testing institute
which has the type test qualification of burner as approved by the State Special
7.1.6 Ignition of ignition burner
7.1.6.1 The ignition of the liquid-fuel shall meet the following requirements.
a) When the ignition burner is spark-ignited, if the interval between the time
when the fuel cut-off valve of the ignition burner is opened and the time
when the fuel cut-off valve of the main burner exceeds 5 s, it shall monitor
the ignition flame;
b) When the flame of the liquid-fuel is not ignited, if the main fuel supply can
be cut off during the safety time and the ignition valve can be closed at
same time, it is not necessary to separately monitor the ignition flame
during the pre-ignition time of 5 s, in which case the ignition fuel can be
supplied for up to 10 s (5 s is the pre-ignition time, 5 s is the safety time).
7.1.6.2 The ignition of gaseous-fuel shall meet the following requirements.
a) Except for valve leak detection, the ignition gas valve shall not be
energized before the spark ignition device or other ignition device is
energized;
b) For burners which has a heat output greater than or equal to 120 kW, the
ignition gas is drawn from between the two main gas safety shut-off valves.
Before startup, the downstream main gas safety shut-off valve shall not
be energized;
c) When the ignition gas is controlled by the position of the downstream main
gas safety shut-off valve, it shall install a pressure control device to make
the ignition gas amount meet the requirements of this standard,
meanwhile the gas-pressure shall be greater than the system’s resistance;
d) In the event of an ignition flame’s failure, the system shall behave as
specified in 7.1.8.
7.1.7 Startup of main burner
7.1.7.1 Direct startup
When igniting the main flame directly, it shall comply with the following
requirements.
a) When using spark ignition, the ignition source shall not be energized
before the end of the purge, and it shall be de-energized before the end
of the safety time;
b) When using a hot-surface ignition device, the ignition device shall be
energized first, the main gas valve can be opened after the temperature
of the ignition source reaches the ignition temperature of the gas.
7.1.9.2 Safety shutdown
During startup or operation, the burner shall be safely shut-down in any of the
following situations.
a) The power supply or dynamic gas source is interrupted or abnormal;
b) The gas-pressure is lower than the set value;
c) Liquid-fuel burners exhibit atomization medium failure, low fuel pressure,
low fuel temperature, high return pressure of burner which has return
nozzle, low rotor speed when using rotary atomizer, etc.
7.1.9.3 Interlock protection
During startup and operation, it shall be safely shut-down and interlock-
protected in any of the following conditions (except as listed in 7.1.8).
a) Fault signal of flame;
b) High-voltage protection signal of gas;
c) Fault signal of air-flow;
d) Abnormal position verification for a burner with position verification;
e) Alarm signal of gas valve leak detection;
f) Temperature overrun signal of liquid-fuel;
g) Overrun of such parameters as pressure, water-level, temperature as
related to the boiler.
7.2 Electrical safety
7.2.1 Electrical equipment’s safety shall meet the requirements of GB 19517,
the electrical safety shall be implemented in the order of direct safety measures,
indirect safety measures, suggestive safety measures.
7.2.2 In order to ensure the normal operation and prevent the danger caused
by the direct action of the current, the electrical equipment shall have sufficient
insulation resistance, dielectric strength, heat resistance, moisture resistance,
anti-fouling, flame retardancy, tracking resistance.
7.2.3 All parts that may be hazardous due to operating voltage, fault current,
leakage current or the like shall have sufficient electric clearance and creepage
distance.
7.2.4 Electrical equipment shall have sufficient mechanical strength, good
a) The flame diameter and length of the burner shall be matched to the
furnace size of the boiler;
b) The nominal heat output of the burner shall be matched to the rated output
of the boiler;
c) It should use the online oxygen monitoring, to improve the control
accuracy of air-fuel ratio.
8 Design and manufacturing
8.1 General requirements
The burner shall be designed to meet the following requirements.
a) The materials used in each component shall be capable of withstanding
the mechanical load, thermal, chemical load in the working environment;
b) The design of each component structure shall ensure the safe and
economic operation of the burner, without any occurrence of instability,
deformation or cracking;
c) For the burner which has a flame observation hole, the structure design of
the flame observation hole’s fitting shall have sufficient strength and
reliable sealing;
d) The components exposed to corrosive fuels shall be corrosion resistant;
e) The burners used in cold environments shall take the necessary antifreeze
measures;
f) When burning explosive gaseous-fuels, all electrical components shall be
installed in accordance with the provisions of the hazard zoning of relevant
equipment, with corresponding explosion-proof grades;
g) The burner and fuel pipelines shall be provided with the measuring-points
for fuel supply pressure, fuel control pressure, fuel pressure at the burner’s
head, air pressure.
8.2 Connection and sealing
The connection between the burner’s components and between the burner and
the boiler shall comply with the following requirements.
a) The burner shall be securely fixed to the boiler. It shall provide a sealing
gasket with thermal insulation function between the burner and the boiler;
b) Components which require regular maintenance shall be easy to
c) The parameter setting of the air monitoring device shall be matched to the
minimum heat output. The limit of volume content of carbon monoxide in
the combustion products shall not exceed 1%.
8.3.4 Air-flow control device
The air-flow control device shall meet the following requirements.
a) The burner shall be fitted with a damper adjustment device or similar
device for regulating the air-flow, and the position of the damper shall be
clearly marked;
b) The manual air-flow control device shall have fixed measures to prevent
mis-operation;
c) The air-volume at the same operating point during the upward and
downward movement of the control device shall be repeatable.
8.3.5 Fuel-flow control device
The fuel-flow control device shall be able to accurately adjust within the design
pressure range, the fuel-flow is stable and reliable. At the same operating point
during the upward and downward movement of the control device, the fuel-flow
shall be repeatable.
8.3.6 Control device of air/fuel ratio
The control device of air/fuel ratio shall comply with the relevant requirements
of ISO 23551-3 and ISO 23552-1 and shall meet the following requirements.
a) The air-flow and fuel-flow shall be linkage-controlled, meanwhile it shall
ensure that the operating point of the burner is repeatable;
b) If using a dual-servo control system, it shall monitor in a real-time manner
the position of the fuel-flow regulating valve and the air-flow regulating
valve;
c) For two and multi-stage control burners, it shall first increase the air-
volume before increasing load; it shall first reduce fuel before reducing
load;
d) At the ignition of burner, it shall verify the fuel and air ignition positions.
The setting of ignition setting shall comply with the requirements of start
heat output in 7.1.5;
e) The air/fuel ratio control device may, in case of failure, still receive the
control signals, to ensure that the system supplies sufficient air or a safety
shutdown.
8.3.10.1 For the burners which burn the high-viscosity liquid-fuel, the fuel shall
be preheated.
8.3.10.2 The heat source for liquid-fuel preheating shall meet the following
requirements.
a) The heat output shall be automatically controlled and shall be cut off
immediately as needed;
b) It shall not be heated by an open flame.
8.3.10.3 The preheating temperature of liquid-fuels shall meet the following
requirements.
a) Under normal pressure, the maximum preheating temperature of liquid-
fuel shall be lower than its opening ignition point, meanwhile it shall not
exceed 90 °C;
b) The maximum preheating temperature of the pressurized preheater shall
be at least 5 °C lower than the saturation temperature of the water at the
corresponding pressure.
8.3.11 Automatic safety shut-off valve of gaseous-fuel
The automatic safety shut-off valve of gaseous-fuel shall comply with the
relevant requirements of ISO 23551-1 and ISO 23551-4 and shall meet the
following requirements.
a) The automatic safety shut-off valve is a normally-closed valve, which shall
be quickly and automatically closed when the driving force is lost;
b) If the nominal diameter of the valve is less than or equal to 200 mm, the
valve shall be safely closed within a period of not more than 1 s; if the
nominal diameter of the valve is more than 200 mm but less than or equal
to 300 mm, the valve shall be safely closed within 3 s; if the nominal
diameter of the valve is more than 300 mm, the valve shall be safely
closed within 5 s.
8.3.12 Valve leak detector
The valve leak detector shall comply with the relevant requirements of ISO
23551-4 and ensure that the opening time of the downstream valve of the two
series-connected gas valves during the leak detection process does not exceed
3 s. Valve leak detection shall be performed during or before the pre-purge.
8.3.13 Low-pressure protection device of gas
The low-pressure protection device of gas shall comply with the relevant
indicated positional tolerance shall be in accordance with the relevant
provisions of GB/T 1184. It shall meet the following requirements.
a) The injection-molded parts shall not have obviously-visible surface defects
such as flow marks, fusion marks, pores, delamination, carbonization
scorch;
b) The injection-molded parts shall be full and shall not have defects such as
depressions, cracks, warpage, flashing;
c) The appearance of the injection-molded parts shall not have any shrinkage
marks that affect the appearance;
d) The structural dimensions shall comply with the requirements of the
technical drawings or the retained sample.
8.4.4 Machined parts
The dimensional tolerances of machined parts shall comply with the relevant
levels in GB/T 1804.
8.4.5 Castings
The dimensional tolerance of castings shall comply with the relevant provisions
of GB/T 6414 and shall meet the following requirements.
a) The casting shall not have cracks. The casting sand, core sand, pouring
gate, riser, package bump, scale, slag inclusion on the surface of the
casting shall all be removed.
b) The machined surface of the castings which have sealing requirements
shall be free from defects such as pinholes, blisters or slag inclusions. The
diameter of defects such as pinholes, blisters or slag inclusions on other
surfaces shall be less than or equal to 3 mm, the depth shall be less than
or equal to 10% of the thickness and less than or equal to 3 mm. The
number of defects shall be less than or equal to 2 on the surface of 100
cm2. The spacing between defects shall be more than or equal to 20 mm.
The total number of defects for a single casting shall be less than or equal
to 10.
c) Except as indicated in the design document, all corners on the casting
shall be rounded, where the inner radius of the fillet shall be more than or
equal to 6 mm, the outer radius of the fillet shall be more than or equal to
4 mm. There shall be no acute angle and sharp transition on the casting.
d) The castings shall be subjected to heat-treatment to eliminate residual
stress. When the castings need to be machined, the heat-treatment shall
be carried out before machining.
requirements in Table 12. Meanwhile it shall prevent the generation of pollutants
such as aldehydes.
9.2 Biomass pyrolysis gas burner
In addition to meeting the general requirements for gaseous-fuel burners, the
design of biomass pyrolysis gas burners shall also meet the following additional
requirements.
a) Set up a reliable ignition burner to ignite by high calorific value fuel such
as light oil, natural gas or liquefied petroleum gas;
b) In terms of structural design, it shall provide a tar cleaning port.
9.3 Surface burner
9.3.1 Design requirements
In addition to complying with the general requirements for gaseous-fuel burners,
surface burners shall also meet the following requirements.
a) The premixing stage shall ensure that the gas and air are evenly mixed.
The premixing stage shall strictly ensure the airtightness and prevent the
premixed gas from leaking.
b) When the nominal heat output is more than 2100 kW, the premixing stage
shall be located at the outlet of the fan. When the premixing stage is
located at the inlet of the fan, the fan shall be an explosion-proof fan.
c) It shall provide gas and air-filtration devices. The pores of the filtration
device shall not be larger than the pores of the burner head, to ensure the
safe operation.
d) It shall provide a negative-pressure monitoring device, flow monitoring
device, or other devices which may reflect the actual air-supply status in
a real-time manner at the outlet of the air filter. The filter shall be
interlocked and protected when it is blocked.
e) It shall provide the anti-backfire monitoring devices inside the flame tube,
such as temperature monitoring, light monitoring, ion monitoring, etc. If
the anti-backfire monitoring device detects a signal, it shall be able to cut
off the fuel supply immediately.
f) The post-purge time of burner shall be more than or equal to 30 s.
g) Burners which have a nominal heat output more than 400 kW shall be
ignited by an ignition flame.
1) For an integrated burner which has a heat output less than or equal to
7000 kW, in principle, it shall carry out the type test on the tested furnace;
2) For split burners and burners which have a heat output more than 7000
kW, it may carry out test on the associated boiler. However, it shall
describe the model, parameter, and manufacturer of the boiler in the test
report;
3) Test the structure, function and operating characteristics of the burner,
meanwhile test all specified operating conditions.
b) Exit-factory inspection
1) The manufacturer of burner will carry out inspection and issue the
corresponding report;
2) Perform cold-function flow inspection and hot-safety control function
verification test;
3) The product can only be exit-factory after passing inspection.
c) In-use detection
1) The user unit of the burner or its authorized qualified institute will carry
out detection and issue a corresponding report;
2) The inspection period of the in-use burner is 1 year;
3) Check whether the performance of the control and safety devices is
reliable.
10.2 Type test
10.2.1 Number of prototypes
The number of prototypes for the type test is one for each model.
10.2.2 Principle of coverage
10.2.2.1 The principle of coverage of the burner’s type test is that the type test
for different models of burners of the same power class in the same series are
covered by each other.
10.2.2.2 For the covered burner, the type test institute shall, after reviewing the
product’s safety declaration information and the exit-factory technical
documents provided by the manufacturer, indicate the coverable model of
burners in the type test certificate and report of the burner that has passed the
type test.
The inspection items of in-use burner after modification shall be in accordance
with the Appendix H. It shall carry out test according to the actual modifications.
The test results shall comply with the relevant requirements of this standard.
11 Technical documents and markings
11.1 Product’s exit-factory technical documents
During exit-factory, the burner shall be accompanied with at least the following
exit-factory technical documents (in Chinese and in SI units).
a) Product’s shape and installation dimension drawing;
b) Electrical wiring diagram;
c) Product’s instruction manual;
d) Product qualification certificate;
e) Product’s type test certificate or spot-check certificate (duplicated copy);
f) Product’s packing list.
11.2 Product’s instruction manual
The product’s instruction manual shall include the following.
a) Product’s structure and working principle;
b) Product’s performance description (including burner’s operating curve or
heat output range);
c) Installation requirements;
d) Detailed description of the operation method;
e) Maint...
......
 
(Above excerpt was released on 2019-03-30, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT36699-2018