Some standard content:
GB18111--2000
Gas-fired volumetric water heaters have been produced and used in my country for many years. Due to the lack of a unified national standard, each enterprise produces according to different national standards or the standards of other products in my country. The state cannot supervise this product, resulting in uneven product quality. This product is a safety product, and the quality of the product directly affects the safety of people's lives and property. With the improvement of people's living standards, this product will have a rapid development, and it is very necessary to formulate a unified mandatory standard for this purpose. This standard is compiled in reference to the American national standard ANSI Z21.10.1:1998 "Gas Water Heater", ANSI Z21.10.3:1998 "Gas Water Heater", Australian national standard AG102:1998 "Gas Water Heater" and Japanese industrial standard JIS S2109:1996 "Household Gas Water Heater" and JIS S2093:1996 "Household Gas Combustion Appliance Test Method", combined with the actual production and testing situation of China's gas-fired volumetric water heaters. The technical content is equivalent to the American National Standard ANSI Z21.10.1, ANSI Z21.10.3, and the Australian National Standard AG102.
This standard is proposed by the Ministry of Construction of the People's Republic of China. This standard is managed by the China Municipal Engineering North China Design Institute, the technical management unit of the Ministry of Construction's urban gas standards. This standard is drafted by the National Gas Appliance Quality Supervision and Inspection Center, A.O. Smith (China) Water Heater Co., Ltd., and Haote Volumetric Water Heater (Chengdu) Co., Ltd. The main drafters of this standard are: Wang Qi, Shi Zhengyan, Ju Ping, Qie Jianzhong, Liu Tong, and Yang Xiaoming. 808
１ Scope
National Standard of the People's Republic of China
Gas Storage Water Heater
Gas storage water heater
GB18111--2000
This standard specifies the definition, classification, basic parameters, structural requirements, main performance, test methods and marking, packaging, storage and transportation of gas storage water heaters (hereinafter referred to as water heaters) with a rated heat load less than or equal to 180MJ/h (50kW). Gas storage water heaters with a rated heat load greater than 180MJ/h (50kW) and less than 360MJ/h (100kW) shall refer to this standard. This standard applies to closed and open gas storage water heaters. It is not applicable to other types of gas water heaters. The gas referred to in this standard is the gas specified in GB/T13611-1992 "City Gas Classification" and GB13612-1992 "Artificial Coal Gas". 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB1911990 Pictorial marking for packaging, storage and transportation
and a simple method using an envelope measuring surface above the reflecting surface GB/T3768---1996 Acoustics-Sound pressure method for determining the sound power level of noise sources GB/T13611--1992 Classification of urban gases
GB13612-1992 Coal gas
GB/T16411--1996 General test methods for household gas appliances GB16914--1997 General technical rules for safety of gas burning appliances CJ3062--1996 General safety requirements for gas burning appliances using AC power supply 3 Definitions
This standard adopts the following definitions:
3.1 Storage water heater A water heater with a container for storing hot water inside the water heater and serving as an integral part of the water heater. 3.2 Capacity
The volume of water that can be stored in the water storage container of a volumetric water heater, unit: 1. 3.3 Combination relief valve A valve that can respond to temperatures and pressures exceeding the set value. 3.4 Combination gas controller Combination gas control A gas control device that is assembled into one unit and has two or more different functions. 3.5 Drain valve
A valve at the bottom of the water storage container, through which the water in the water storage container of the water heater can be drained. 3.6 Draught diverter
A device installed at the smoke outlet of the water heater, used to reduce the impact of backdraft on the combustion performance of the burner; it is conducive to smoke exhaust and facilitates the escape of smoke when the flue is blocked.
Approved by the State Administration of Quality and Technical Supervision on May 19, 2000 and implemented on November 1, 2000
GB 181112000
3.7 Vent/air intake terminal
A device installed at the end of the flue of a closed exhaust water heater, located outside the building, through which combustion air is obtained from the outside atmosphere and smoke is discharged after combustion.
3.8 Measured heat input The reference gas passing through the nozzle at the rated gas pressure is expressed in terms of heat per unit time [MJ/h (kW)], and the ambient temperature and pressure are both in standard conditions (0C, 101.325kPa standard atmospheric pressure). 3.9 Maintenance consumption The heat load required for the water heater to maintain a certain set temperature. 3.10 Overload
The overload specified in this standard is 115% of the rated heat load for artificial gas and natural gas, and the heat load when the inlet pressure of the burner rises to 3.3kPa for liquefied petroleum gas. 3.11 Over-temperature cut-out device Over-temperature cut-out is a device that automatically shuts off the gas and stops working to prevent the temperature from exceeding the preset value. When it is cut off, there are two types: one that cannot be reset and one that can be reset manually or automatically.
3.12 Flue gases spillage Flue gas is not completely discharged from the flue, but overflows from the water heater or the opening of the exhaust hood. Classification and basic parameters
4.1 Classification of water heaters
4.1.1 According to the structure of water heaters, they can be divided into: closed water heaters and diffused water heaters, see Table 1. Table 1
Closed water heaters
Open water heaters
Classification content
Water heaters whose water storage containers are not provided with permanent holes to the atmosphereWater heaters whose water storage containers must be provided with permanent holes to the atmosphere
4.1.2 According to the type of gas used, they can be divided into: liquefied petroleum gas water heaters, natural gas water heaters and artificial gas water heaters, see Table 2. Table 2
Liquid petroleum gas water heaters
Natural gas water heaters
Artificial gas water heaters
Classification content
Water heaters suitable for liquefied petroleum gas
Water heaters suitable for natural gas
Water heaters suitable for artificial gas
According to the use function, they can be divided into: hot water type water heaters, heating type water heaters and dual-purpose water heaters, see Table 3.4. 1. 3
Hot-water water heaters
Heating water heaters
Dual-purpose water heaters
Water heaters for hot water supply
Water heaters for heating
Classification content
Water heaters suitable for both hot water supply and heating, hot water and heating are independent water systems 4.1.4 According to the installation location, they can be divided into indoor water heaters and outdoor water heaters, see Table 4. 810
Indoor water heaters
Outdoor water heaters
GB18111
Classification content
Water heaters suitable for indoor installation
Water heaters suitable for outdoor installation
Indoor water heaters can be divided into natural exhaust water heaters and forced exhaust water heaters according to the air supply and exhaust method, see Table 5. Table 5
Natural exhaust type of flue
Exhaust type
Forced supply
Exhaust typebzxZ.net
Balanced natural exhaust type
Forced exhaust type of flue
Balanced forced supply and exhaust type
4.2 Model of water heater
Model of water heater:
Type of gas
Classification content
The air for combustion is taken from indoors, and the smoke generated is discharged to the outside by natural suction. The air for combustion is taken from outdoor, and the smoke generated is discharged to the outside by natural suction. The air for combustion is taken from indoors, and the smoke generated is discharged to the outside by a fan. The air for combustion is taken from outdoor, and the smoke generated is discharged to the outside by a fan. Or the air for combustion is taken from outdoor, and the smoke generated is discharged to the outside by a fan. Supply and exhaust method
Rated volume
Installation position
Rated volume is expressed by 3 digits, in L, and the number less than 3 digits is supplemented by 0 in front, and it cannot be left blank. 4.2.2
The modification serial number of water heater products is expressed by English letters A, B, C, D...: A-
First modification;
Second modification;
And so on.
Improvement serial number
Example: LPG flue natural exhaust type rated capacity 80L outdoor installation first modified gas volumetric water heater 4.2.4
Expressed in the following way.
4.3 Basic parameters
Product modification serial number (first modification)
Installation location is outdoor installation type, indoor installation type can omit rated capacity (80L)
Supply and exhaust method (flue natural exhaust type) Gas type (liquefied petroleum gas)
Gas volumetric water heater
4.3.7 The rated gas pressure of the water heater shall comply with the provisions of Table 6. 811
Rated gas pressure.Pa
GB 18111—2000
Liquefied petroleum gas
4.3.2 Rated capacity of the water heater: should be an integer multiple of 5. 5 Design and structural requirements
5.1 General structure
5.1.1 The structure of the water heater should be safe, strong and durable. Natural gas
Artificial gas
5.1.2 Each part of the water heater should be fixed to prevent displacement. And it should be manufactured to maintain a fixed relationship between them under normal and reasonable handling and use conditions. Non-permanent fixed parts should be designed to be easy to disassemble, assemble or replace during cleaning and maintenance. 5.1.3 The general structure and components of the water heater should be easy to clean and maintain. The parts should be well assembled. The parts fixed by bolts and other fasteners should have sufficient rigidity. All exposed edges that may come into contact with the human body during use and maintenance should be smooth. 5.1.4 The screws and fasteners used for the general components of the water heater should comply with the relevant national standards and can be assembled and removed with general tools. 5.1.5 The burner should be correctly positioned and securely fixed to ensure that the burner will not move or fall off during use. Its structure should ensure that the burner cannot be installed incorrectly. The main burner, small fire burner and pilot burner and all their components can be installed and removed using common tools.
5.1.6 The primary air adjustment plate should be flexible to adjust, should be fixed after adjustment, should not slide during operation, and should be easy to tighten with common tools. 5.1.7 The main burner nozzle should be easy to install and remove with common tools, and the nozzle accessories should be reliably fixed in any case to ensure the correct relative position with the burner. The nozzle should be connected to the nozzle seat with at least 3 full threads. 5.1.8 The thermostat of the water heater should be easy to repair and replace, and the maximum setting value of the thermostat should not be greater than 82C. 5.1.9 The water heater shell should be provided with an opening, the size of which should be convenient for the installation and maintenance of the burner, or for the convenient removal of the burner for cleaning. 5.1.10 The water heater should be provided with a fire viewing hole for the user to conveniently observe the flames of the main burner and small fire burner with the naked eye (directly or indirectly) when the combustion chamber door is installed in place. The fire-viewing hole shall be made of high-temperature resistant materials and prevent mechanical damage (except when the fire-viewing hole is located inside the shell). If glass is used, it shall be framed and the thickness of the glass shall not be less than 3mm. 5.1.11 Spread-type water heaters shall be equipped with a normal pressure water tank water supply device or other controllable water supply device, and a water level gauge with a protective cover shall be used. The overflow port on the water supply tank shall be located at the water level adjustment scale in the water tank. When the water in the water heater is heated from a cold state to the highest temperature, no water should flow out of the overflow port.
5.1.12 The water tank of the water heater shall be equipped with a drain valve, which shall be set to facilitate the emptying of the water in the water tank as much as possible for easy cleaning and to prevent the accumulation of foreign matter. The drain valve of the tabletop water heater shall be able to be operated from the front of the appliance. 5.1.13 The outlet of the drain valve shall be able to be connected to a hose so that the water can be drained to the sewer pipe. 5.1.14 The immersion pipe of the water heater shall be equipped with an anti-siphon hole. The hole shall be located within 150mm from the top of the water tank. The diameter of the anti-siphon hole should be no less than 3mm
Non-metallic immersion pipes should be accompanied by a certificate approved by the inspection agency, indicating that the material meets the requirements in terms of non-toxicity, solubility, temperature resistance, etc. It should be marked with the manufacturer's name or trademark and batch number. Non-metallic immersion pipes with a relative density of less than 1.0 should be reliably fixed, and the device should limit the vertical displacement of the immersion pipe to within 6.5mm.
5.1.15 The "off" position on the manual gas valve should be clearly indicated. Manual gas valves with multiple functions should clearly indicate the position of each function, including the dedicated ignition position. 5.1.16 The structural design of the water heater should be able to prevent hot particles from falling to the ground. 5.1.17 For water heaters used for outdoor installation, all controllers and electrical circuits should be provided with adequate protection according to the climatic conditions specified in the spray test in 6.22 of this standard.
5.2 Safety control device
GB 18111—2000
5.2.1 The gas leading to the main burner should pass through at least two automatic shut-off valves, one of which can be controlled by a temperature control device. 5.2.2 For water heaters with forced exhaust, no unsafe phenomenon should occur when the exhaust fan or blower is not working properly. 5.2.3 For water heaters that work with power supply, the gas control valve should be in the closed state when the power supply is interrupted. 5.2.4 Water heaters that use AC power should be equipped with a leakage protector. 5.2.5 The water heater should be equipped with the following devices, and the installation location and technical performance of these devices should comply with the relevant requirements of 6.1. a) Flameout protection device;
b) Hot water thermostat;
c) Dispersed water heaters should be equipped with temperature safety valves; d) Closed water heaters should be equipped with pressure safety valves and temperature safety valves or over-temperature cut-off devices. There should be independent interfaces on the water tank for directly installing pressure safety valves and temperature safety valves, and their specifications should provide adequate protection for the water heater. 5.2.6 The water heater should be equipped with a gas pressure regulator, and a secondary pressure measuring interface must be provided between the pressure regulator and the burner. 5.3 Materials
5.3.1 The materials used to manufacture water heaters should be able to withstand the temperature and pressure of the water heater during normal use, and have sufficient mechanical strength and rigidity. The steel plates and galvanized steel plates used should be of high quality. Materials such as zinc plates, stainless steel plates, copper materials, and standard parts shall all comply with the requirements of relevant national standards or industry standards. 5.3.2 Materials used in contact with water in the hot water supply part of hot water heaters and dual-purpose water heaters must be materials that have been proven to be suitable for contact with food.
5.3.3 Asbestos shall not be used in the structure of the water heater, except where it is contained, protected or combined with bonding materials and asbestos fibers will not float in the air under normal conditions of use.
5.3.4 Insulating materials used in water heaters should not be damaged or fail under normal conditions of use due to installation, movement or condensation. 5.3.5 Materials used in the production of The thickness of the primary flue material with an outer diameter ≤ 125mm shall satisfy the formula (1): D
Where: D: flue outer diameter, mm;
Fc...Corrosion factor, mm, for uncoated flues Fc-0.28mm; for flues with refractory ceramic coatings Fc-0mm. For flue materials with an outer diameter ≥ 125mm, the thickness of uncoated materials shall not be less than 2.8mm; for refractory ceramic coatings, the thickness shall not be less than 2.5mm. The average thickness of the refractory ceramic coating shall not be less than 0.08mm. 5.3.6 The thickness of the material used to make the water tank barrel of the water heater shall ensure that the water tank can withstand the hydrostatic pressure test. 5.3.7 The burner shall be a whole casting or have an equally airtight and durable structure, and shall be made of corrosion-resistant materials with a melting point greater than 900C.
5.3.8 The metal material thickness of the secondary air adjustment plate shall not be less than 0.6mm. When the material thickness is less than 1.2mm, it shall be strengthened by outer edge flanging or other methods. The adjustment plate shall be made of corrosion-resistant material or have a corrosion-resistant surface plating (coating) layer for protection. 5.3.9 The screws used to fix the secondary air adjustment plate shall be made of corrosion-resistant material. If it is made of steel, its surface shall have a corrosion-resistant metal coating.
5.3.10 The melting point of the nozzle material shall be greater than 700C. The burner nozzle bracket and the primary air adjustment plate shall be made of metal materials with a melting point greater than 500C and corrosion-resistant.
5.3.11 The gas valve of the water heater should be made of metal material with a melting point greater than 350℃. 5.3.12 The gas pipe of the water heater should be made of metal material with a melting point greater than 350C or non-combustible material. The gas pipe of the low-fire burner and the pilot burner should be made of metal material with a melting point greater than 500C. 5.3.13 The heat exchange components should be made of metal material with a melting point greater than 900℃. If ordinary steel plates are used, the surface in contact with domestic water should be treated with anti-corrosion.
5.3.14 Sealing materials in contact with gas, such as gaskets, grease, etc., should not have anti-corrosion sealing properties, and should not react chemically with the gas in contact.
5.3.15 The shell, exhaust hood and smoke-passing parts of the water heater should be made of corrosion-resistant materials or metal materials with anti-corrosion treatment on the surface. The primary exhaust pipe should be made of seamless steel pipe. GB18111--2000
5.3.16 The permanent labels such as safety instructions and warnings, labels for guiding safe and correct use, and specification nameplates on water heaters should have good bonding quality and clear pictures and texts after undergoing the tests specified in this standard. 5.4 Smoke exhaust requirements
5.4.1 The design of the flue interface can refer to the inner diameter design of the exhaust duct in Table 7. When connected to the secondary flue, the vertical interface should have a connection length of at least 13mm, and the horizontal interface should have a connection length of at least 25mm. The flue terminal opening should not be able to accommodate a small ball with a diameter of 16mm.
Nominal diameter of exhaust duct
Inner diameter of exhaust duct
100110120130140160
100110
140160
180200220240
220|240
180200
5.4.2 If the exhaust and air intake adopt coaxial balanced flue, the flue and exhaust/air inlet device shall be provided at random. Other forms of balanced natural exhaust water heaters and balanced forced exhaust water heaters shall be provided with exhaust/air inlet device at random. The flue shall be configured by the installer according to the requirements of the installation site, but shall be made of corrosion-resistant materials or metal materials with corrosion-resistant surface treatment, and meet the requirements of exhaust temperature. 5.5 Appearance requirements
The shell of the water heater should be flat and even, and after surface treatment, there should be no obvious appearance defects such as uneven spraying, wrinkles, scratches, cracks, paint peeling, rust, etc.
6 Technical requirements
6.1 Air tightness of the gas system of the water heater (test method: 7.5) a) The gas leakage of the gas system of the water heater should not be greater than 0.07L/h when the air pressure is 4.2kPa; b) There should be no leakage from the air inlet of the water heater to the front of the burner fire hole; c) For valves with sealing function, the gas leakage should not be greater than 0.07L/h when the air pressure is 4.2kPa; d) For valves with automatic control function, the gas leakage should not be greater than 0.55L/h when the air pressure is 4.2kPa. 6.2 Heat load accuracy (test method: 7.6) The deviation range between the measured heat load of the water heater and the rated heat load is ±10%. (Test method: 7.6.1) 6.3 Combustion condition in windless state (Test method: 7.7.2) 6.3.1 Flame transmission (Test method: 7.7.2.1) After igniting the fire hole at the main burner of the water heater, the flame should spread to all the fire holes within 4 seconds, and there should be no explosion. 6.3.2 Flame state (Test method: 7.7.2.2) The flame of the main burner of the water heater should be clear and uniform. 6.3.3 Yellow flame when the electrode contacts (Test method: 7.7.2.6) The electrode should not contact the yellow flame during normal use. 6.3.4 Black smoke (Test method: 7.7.2.7) The flame should not have obvious yellow flame and black smoke that cause carbon deposition. 6.3.5 Flame stability of the main burner (Test method: 7.7.2.3, 7.7.2.4, 7.7.2.5) When the main burner of the water heater is working, there should be no flameout, flashback, and flame separation that hinders use. 6.3.6 Flame stability of low-fire burner (test method: 7.7.2.8) When the low-fire burner is working, there should be no flameout, flashback and flame separation that hinders use. The top yellow flame without carbon deposition is allowed. 6.3.7 Combustion noise (test method: 7.7.2.9) When the water heater is working at full load at rated pressure, the combustion noise should not be greater than 65dB. (The combustion noise should include the working noise of the fan of the forced air supply and exhaust water heater.)
6.3.8 Flameout noise (test method: 7.7.2.10)811
GB 18111-2000
When the water heater is working at full load at rated pressure, the flameout noise should not be greater than 85dB. 6.3.9 CO content in flue gas (test method: 7.7.2.11) The CO content in flue gas when the water heater is working (when the excess air coefficient α=1) shall meet the following requirements: a) The heat load of the water heater with a pressure regulator is 115% of the rated heat load, and the CO content in the flue gas when the water heater without a pressure regulator is used at the highest pressure should not be greater than 0.04%. b) When working at the lowest pressure (see Table 9), the COa=1 content in the flue gas of the water heater should not be greater than 0.02%. 6.3.10 Combustion conditions when the power supply voltage changes (test method: 7.7.2.12) The forced supply and exhaust water heater should reduce the power supply voltage to 85% of the rated voltage and increase it to 110% of the rated voltage, and then conduct the combustion condition test. Its performance should meet the requirements of 6.3.1~～6.3.9 of this standard. 6.3.11 Tightness of exhaust system (test method: 7.7.2.13) When the natural exhaust water heater is operated under rated heat load for 5 minutes, there should be no leakage or overflow of smoke from the water heater, the flue system or the 0.6m long flue connected to the exhaust hood. 6.3.12 Smoke backflow (test method: 7.7.2.14) When the water heater is operated in a windless state, the smoke shall not flow back into the room. 6.3.13 Condensate (test method: 7.7.2.15) When the water heater is operating normally, no condensate should flow out of the water heater. Condensate is allowed to appear at the beginning of operation, but flameout shall not occur.
6.4 Combustion conditions in flue blocked state
6.4.1 For natural exhaust water heaters with flue equipped with exhaust hoods or similar devices, when the flue outlet is completely blocked during normal operation, the COa=1 content in the water heater flue gas should not be greater than 0.04%. The burning flame should not be extinguished or have abnormal flame. (Test method: 7.7.3.1)
6.4.2 When testing a flue forced exhaust water heater under normal oxygen content in the environment, the flue gas outlet or the flue gas diversion device outlet provided by the flue forced exhaust type is blocked to any extent until it is completely blocked, and the COa=1 content in the flue gas should not be greater than 0.04%; or the gas source is automatically cut off, and the pressure in the flue should be greater than 50Pa when the gas source is cut off. If the water heater stops working, the flue gas outlet is opened again, and the water heater is re-ignited, there should be no explosion. (Test method: 7.7.3.2) 6.5 Combustion condition of water heater with wind
6.5.1 The performance of flue natural exhaust water heater shall meet the following requirements: (Test method: 7.7.4.1) a) Blow air downward at a wind pressure head (dynamic pressure) of 10Pa for 1 minute. During blowing, the flames of the main burner and the small fire burner should not be extinguished or have abnormal flames, and the CO=l content in the flue gas should not be greater than 0.04%; b) Draw air upward at a wind pressure head (dynamic pressure) of 10Pa for 1 minute. The flames of the main burner and the small fire burner should not be extinguished or have abnormal flames, and the COa= in the flue gas should not be greater than 0.04%. 6.5.2 The performance of outdoor water heaters, balanced natural exhaust water heaters and balanced forced exhaust water heaters shall meet the following requirements: (Test method: 7.7.4.2)
a) When the wind speed is 0~9m/s, the ignition of the pilot burner or the small fire burner shall be normal; b) When the wind speed is 0~~18m/s, the performance of the water heater shall be normal, and the test points with COa-1 content in the flue gas greater than 0.04% shall not exceed 10% of the total number of test points;
c) When the wind speed is 018m/s, the performance of the small fire burner shall be normal and the main burner can be ignited safely and reliably; d) When the wind speed is 18~26m/s, the main burner of the water heater shall be able to burn normally or stop working safely and reliably. 6.5.3 When the power supply voltage of outdoor water heaters and balanced forced air supply and exhaust water heaters connected to the mains is adjusted to 85% and 110% of the rated voltage, the test of 6.5 shall be carried out, and the performance shall meet the requirements of 6.5.2 of this standard. (Test method: 7.7.4.2) 6.6 Leakage of sealing structure (Test method: 7.7.4.3) In the sealing test of balanced natural exhaust type and balanced forced air supply and exhaust type, the sealing performance of balanced natural exhaust type water heaters and balanced forced air supply and exhaust type shall be good. When a static pressure of 25Pa is applied, the leakage shall not be greater than the equivalent of the rated heat load megajoules multiplied by 0.15, unit 815
is m/h.
6.7 Surface temperature rise (test method: 7.8) GB18111--2000
When the thermostat of the water heater is set at the highest temperature and there is an appropriate water flow to keep it in the open state, the temperature rise of the water heater after continuous operation for at least 2 hours shall not exceed the following values 6.7.1 Surface temperature rise with scalding hazard
a) The surface temperature rise of bare or painted metal parts shall not exceed 40K; b) The surface temperature rise of sugar porcelain parts shall not exceed 45K; c) The surface temperature rise of glass parts shall not exceed 50K; d) The surface temperature rise of plastic parts shall not exceed 60K. (Including plastic parts with metal coatings with a thickness of no more than 0.13mm and metal parts covered with a plastic layer with a thickness of no more than 0.13mm). 6.7.2 Surface temperature rise of walls, floors and ceilings The surface temperature rise of walls, floors and pre-sheds near or in contact with water heaters shall not exceed 50K. If the water heater is marked with "shall be installed on a fireproof foundation", the allowable ground temperature rise shall not exceed 65K. 6.7.3 Surface temperature rise of manually operated parts
The surface temperature rise of the water heater external maintenance door handle, drain valve handle, user adjustment of water temperature, operation of the main fire or pilot gas supply valve, or control parts normally operated when resetting the safety cut-off device shall not exceed 35K for metal parts and 45K for non-metal parts.
6.7.4 Surface temperature rise of other parts, seals, wiresa) The surface temperature rise of the gas control valve body, thermostat, etc. shall not exceed 50K; b) The surface temperature rise of the main gas pipe and pilot gas pipe, etc. shall not exceed 50K; b) The surface temperature rise of sulfur The surface temperature rise of parts sensitive to chemical corrosion (such as copper parts) shall not exceed 50K; c) The surface temperature rise of hoses (unless specially approved high temperature resistant materials) shall not exceed 20K; d) The surface temperature rise of seals, connectors or similar materials shall not exceed 100K; e) The surface temperature of wires shall not exceed the maximum temperature specified for the wire insulation layer; {) The surface temperature of electrical components and wires shall not exceed the temperature specified for electrical components. 6.8 Heat resistance
6.8.1 When the thermostat is set to the highest temperature and there is appropriate water flow to keep the thermostat open, the water heater shall meet the following requirements when it is continuously operated for 10 hours under overload ：(Test method: 7.9.1) a) The doors and other movable parts of the water heater should function normally, and the appearance of the water heater should not be permanently damaged. The reinforcement of the water heater should not be seriously damaged. A small amount of cracks are allowed on the insulating rigid polyurethane foam, but they must not affect the appearance and performance of the water heater; b) The controller and thermostat should not have deformation, leakage or other failures; the burner should not have deformation or damage that affects normal operation; c) The insulation layer of the wire should not be coked or melted. 6.8.2 If the burner flashes back, the water heater runs at maximum load for 1 hour, and the material and structure of the burner should not melt or deform. (Test method: 7.9 .2)
6.9 Flue gas temperature (test method: 7.10) The exhaust gas temperature of the water heater shall not exceed 270K above the room temperature. This provision does not apply to outdoor water heaters and water heaters equipped with an integral exhaust system.
6.10 Hot water performance
6.10.1 Thermal efficiency (test method: 7.11.1) The thermal efficiency calculated with the lower calorific value under rated heat load shall not be less than 75% (70% with the higher calorific value). 6.10.2 Maintaining heat load (test method: 7.11.2) The heat load required to maintain the average water temperature in the water heater 45K above the ambient temperature shall not exceed the value calculated by formula (2): M = 0.42 + 0.02 V + 0.006 R Where: M-.—maintaining heat load, MJ/h; 816
· (2)
V——-rated capacity of water heater, I;
R--rated heat load, MJ/h.
GB18111—2000
6.10.3 Hot water production rate (test method: 7.11.3) (except heating water heaters) When the water heater continuously releases hot water at a flow rate of 9.0L/min±0.5I/min, before the water temperature is lower than the initial hot water temperature of 416K, the amount of hot water that can be released should not be less than 70% of the rated capacity. 6.11 Thermostat (test method: 7.12) The water heater should be equipped with an adjustable or non-adjustable thermostat for control. The thermostat should be able to operate under all test pressures specified in this standard. Thermostat dials provided with temperature display shall be calibrated so that the error between the outlet water temperature and the set temperature when the thermostat is actuated shall not exceed 6K. 6.12 Hot water temperature limit (Test method: 7.13) The thermostat set for the control operation of the water heater and the dedicated non-adjustable limit water tank upper thermostat shall be regarded as only thermostats in this test.
a) For water heaters providing hot water temperature less than 71°C, the increase in the outlet water temperature shall not exceed 17K of the maximum set temperature, and the outlet water temperature shall not exceed 88°C.
b) For water heaters providing hot water temperature greater than or equal to 71°C, the increase in the outlet water temperature shall not exceed 11K of the maximum set temperature, and the outlet water temperature shall not exceed 93°C, before which the over-temperature protection device or temperature safety valve shall not be actuated. 6.13 Over-temperature cut-off device and temperature safety valve (Test method: 7.14, 7.15) The water heater shall be provided with an over-temperature cut-off device or temperature safety valve. In normal operation, the over-temperature cut-off device and temperature safety valve shall not be actuated. When the water temperature at 150mm from the top of the water tank exceeds 99C, it should operate reliably. The over-temperature cut-off device should automatically cut off the gas sent to all burners, including the low-fire burner; the temperature safety valve should automatically open the drain, and the heat discharge capacity of the temperature safety valve should be greater than the maximum heat load of the water heater.
The installation position of the over-temperature cut-off device or the temperature safety valve should be within 150mm of the top of the water tank, or within 20% of the total height of the water tank from the top, whichever is higher. 6.14 Pressure safety valve (test method: 7.16) Closed water heaters should be equipped with one or more pressure safety valves or temperature/pressure combination safety valves. The pressure setting of the pressure safety valve shall not exceed the maximum working pressure of the water heater. The pressure safety valve should operate reliably at the pressure specified by the manufacturer. 6.15 Safety closing device (test method: 7.7.2.12) The safety closing device of the forced air supply and exhaust water heater shall meet the following requirements: a) The water heater operates normally within the range of reducing the power supply voltage to 85% of the rated voltage and increasing it to 110% of the rated voltage. b) When the voltage changes within the range of 85%110% of the rated voltage, the water heater shall operate safely or stop operating safely. c) When the power is on, if the mechanical device fails, the water heater shall stop operating safely. ct) When the power is interrupted at any time, the safety shut-off device shall automatically shut off the gas source and stop operating. 6.16 Water tank capacity and drain valve (test method: 7.17) 6.16.1 The water tank capacity of the water heater shall be more than 90% of the rated capacity specified by the manufacturer. 6.16.2 The water heater shall be equipped with a drain device, which shall be able to effectively drain the water in the water tank. A water heater with a volume greater than 200L shall be able to discharge 85% of the rated capacity of water at an average flow rate of not less than 9L/min. 6.17 Hydrostatic pressure test (test method: 7.18) The water tank of the water heater shall withstand a 5min hydrostatic pressure test, and the water tank shall not leak or permanently deform. 6.17.1 The test pressure of a water heater directly connected to the tap water supply pipe is 1.5 times the rated working pressure and shall not be less than 2.0MPa. 6.17.2 The test pressure of a water heater not connected to the main water supply pipe is 2 times the rated working pressure. 6.17.3 The test pressure of an open water heater is 35kPa. 6.17.4 Tubular heat exchangers shall be able to withstand a hydrostatic pressure test of 2.5 times the design pressure and shall have no leakage or permanent deformation. 6.18 Gas pressure regulator (test method: 7.19) When a water heater is equipped with a gas pressure regulator, the gas inlet pressure of a water heater using liquefied petroleum gas or natural gas increases from 0.75 times the rated pressure to 5.0kPa; when the gas inlet pressure of a water heater using artificial gas increases from 0.75 times the rated pressure to 3.0kPa, the change in the outlet pressure of the regulator shall not exceed 20% of its rated outlet pressure. 6.19 Ignition and ignition device
6.19.1 Under normal circumstances, the ignition system should be started 10 times continuously, and the number of ignitions should not be less than 8 times. Failure ignition should not occur continuously and there should be no deflagration.
When started 10 times continuously in the windy state, the number of ignitions should not be less than 5 times, and there should be no deflagration. (Test method: 7.20.1) 6.19.2 The ignition system powered by the power supply is tested at 85% and 110% of the rated voltage. Its ignition performance should comply with the provisions of 6.19.1 of this standard. (Test method: 7.20.1) 6.19.3 The ignition spark shall stop at the end of the flame stabilization period of the ignited burner. For the pilot burner that automatically extinguishes after the main burner is ignited, the electric spark can continue until the flame of the main burner stabilizes. (Test method: 7.20.1) 6.19.4 When a small fire burner is used to directly ignite the main burner, the small fire burner shall meet the following requirements: (Test method: 7.20.2)
a) When the small fire burner backfires or the primary air hole is blocked, the main burner should be ignited normally without deflagration, or the safety cut-off device automatically closes the gas passage.
b) When the flame of the small fire burner is adjusted to just keep the flameout protection device open, the controller is allowed to adjust the small fire burner to stably and safely ignite the main burner at any gas flow rate. 6.19.5 The performance of the automatic ignition device shall meet the following requirements: (Test method: 7.20.3) a) The ignition device that automatically ignites the small-fire burner shall stably and safely ignite the small-fire burner within 8 seconds. If the ignition fails, the gas passage shall be automatically closed.
b) The ignition device that directly ignites the main burner shall stably and safely ignite the main burner within 2 seconds. If the ignition fails, the gas passage shall be automatically closed until it cannot be automatically ignited again. c) For forced exhaust water heaters, after the ignition device fails to ignite and the gas passage is closed, automatic ignition can be started again after the air in the combustion chamber is fully purged to prevent explosion. 6.19.6 When using a thermoelectric flameout protection device, during normal manual ignition, the valve opening time should not be greater than 45 seconds, and the valve closing time should not be greater than 60 seconds. (Test method: 7.20.4)
6.20 Strength of exhaust hood (Test method: 7.21) 6.20.1 The structure of the exhaust hood and its support rigidity on the water heater shall be able to withstand the loads specified below without causing operational obstruction or obvious deformation.
a) The exhaust hood with vertical outlet shall withstand a vertical compression load equal to the outlet diameter multiplied by 0.09kg/mm. b) The exhaust hood with horizontal outlet is connected to an exhaust pipe made of steel plate with a length of 3m, suitable diameter and wall thickness of not less than 0.5mm at its outlet (the other end of the exhaust pipe is supported by a bracket at a position not more than 25mm from the terminal). 6.20.2 The other properties of the exhaust hood shall meet the requirements of various performances during the water heater test. 6.21 Exhaust/inlet device (Test method: 7.22) The structure, manufacture and support rigidity of the inlet/exhaust port shall be able to withstand a 65kg hanging load and the impact of a 10kg hanging sandbag without causing damage that would lead to unsafe use. The water heater shall meet the performance requirements during the test. 6.22 Spray test (test method: 7.23) The exhaust/air inlet devices of outdoor water heaters and balanced natural exhaust and balanced forced exhaust water heaters exposed to the outdoors shall be able to operate normally during and after the spray test (see Figure 1 for the spray test device). 6.23 Electrical performance (test method: 7.24) The electrical performance of water heaters using AC power shall comply with the relevant provisions of CJ3062. 6.24 Vibration resistance (test method: 7.25) After the vibration test, the water heater shall be able to meet the sealing requirements of the gas system and water system, and the parts shall not be loose or displaced, and can operate normally.
6.25 Durability (test method: 7.26) GB 181112000
The durability performance of the water heater shall comply with the requirements of Table 8. 710
Water pressure gauge for each sprinkler head
Control valve and 1/2” pipe for each sprinkler head
Top view
See sprinkler head sample drawing
8Schematic diagram of sprinkler head and connected pipe configuration for spray test S24
1.5×45°
515°0.5×45°
Sprinkler head assembly
Side view
Water spray focus
2.4X11. 5
Hexagonal or round material
3-Slot with square cross section, 1.5 wide, 1.5 deep, spacing 120, thread angle 60°, front thread of screw tangent to middle 2. 1 radial hole Sprinkler head assembly and structure sample drawing
Schematic diagram of spray test
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