Detail of GB 25034-2020

Introduction of GB 25034-2020

GB 25034-2020 Gas-fired heating and hot water combi-boiler English Gas-fired heating and hot water combi-boiler 1 Scope This standard specifies the terms and definitions, classification and models, materials, structure and safety requirements, performance requirements, test methods, inspection rules, marking and instructions, and packaging, transportation and storage of the gas-fired heating and hot water combi-boiler (hereinafter referred to as the "combi-boiler"). This standard is applicable to the combi-boilers with rated heat input less than 100 kW, maximum working water pressure of heating not greater than 0.6 MPa, working water temperature not greater than 95°C, and atmospheric or fully premixed burning mode, including: a) Type 1P and 1G forced gas supply/exhaust combi-boilers specified in Annex A; b) Types 9P and 9G forced exhaust fully premixed condensing boilers with a heat input greater than 70 kW specified in Annex A; c) Types 10Z, 10P and 10G outdoor combi-boilers specified in Annex A. The gas in this standard refers to artificial gas, natural gas and liquefied petroleum gas specified in GB/T 13611. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 191 Packaging - Pictorial marking for handling of goods 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 3768-2017 Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane GB 4706.1-2005 Household and similar electrical appliances - Safety - Part 1: General requirements GB/T 5013.1 Rubber insulated cables of rated voltages up to and including 450/750 V - Part 1: General requirements GB/T 5023.1 Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V - Part 1: General requirements GB/T 6663.1 Directly heated negative temperature coefficient thermistors - Part 1: Generic specification 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 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads GB/T 9124.1 Steel pipe flanges - Part 1: PN designated GB/T 12113-2003 Methods of measurement of touch current and protective conductor current GB/T 14536.1-2008 Automatic electrical controls for household and similar use - Part 1: General requirements GB/T 16411 Universal test methods of gas burning appliances for domestic use GB/T 17626.2-2018 Electromagnetic compatibility - Testing and measurement techniques - Electrostatic discharge immunity test GB/T 17626.4-2018 Electromagnetic compatibility - Testing and measurement techniques - Electrical fast transient/burst immunity test GB/T 17626.5 Electromagnetic compatibility - Testing and measurement techniques - Surge immunity test GB/T 17626.6 Electromagnetic compatibility - Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields GB/T 17626.11 Electromagnetic compatibility - Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests GB/T 17627 High-voltage test techniques for low-voltage equipment - Definitions, test and procedure requirements, test equipment GB/T 19212.1-2016 Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests GB/T 22688 Pressure-type temperature controls for household and similar use GB/T 37499 Safety and control devices for gas burners and gas-burning appliances - Particular requirements - Automatic and semi-automatic valves GB/T 38603-2020 Safety and control devices for gas burners and gas-burning appliances - Particular requirements - Electronic controller GB/T 38693 Safety and control devices for gas burners and gas-burning appliances - Particular requirements - Thermoelectric flame supervision controls GB 50057 Code for design protection of structures against lightning CJ/T 157-2017 Hotplate of lacquered toughened glass for gas appliance CJ/T 198 Stainless steel exhaust pipe for burning equipment CJ/T 199 Supply-exhaust pipe for combustion appliance CJ/T 356 General specifications of home and building electronic systems (HBES) CJ/T 398 Electronic gas/air ratio adjustment devices for household gas appliances CJ/T 450 Pneumatic gas/air ratio adjustment devices for gas-burning appliances HG/T 20592 Steel pipe flanges (PN designated) JB/T 81 Slip-on-welding plate steel pipe flanges 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 gas rate adjuster device for adjusting the gas flow rate of the burner to a predetermined value based on the gas supply conditions 3.2 range-rating device device used by the installer for setting the rated heat input of the combi-boiler within the maximum and minimum rated heat inputs given by the manufacturer according to the actual heat demand of the user 3.3 control thermostat control device for automatically maintaining the water temperature within a predetermined range 3.4 temperature limiter device for closing the gas path to the main burner when the temperature reaches a limit temperature value and automatically re-opening the gas path to the main burner when the temperature drops below the limit value 3.5 overheat cut-out device protective device that triggers a safety shutdown and a non-volatile lockout before the combi-boiler overheat causes damage to the combi-boiler or a safety accident 3.6 ignition rate ФIGN average heat input during ignition safety time 3.7 ignition delay opening time TIA time of thermoelectric flame monitoring device from the ignition of the monitored flame to the flame signal causing the gas valve to be in a close-in state 3.8 extinction delay closing time TIE time of thermoelectric flame monitoring device from extinction of the monitored flame to cutting off the gas supply 3.9 ignition safety time TSA time from the command to turn on the main burner gas supply to the command to turn off the gas supply in the case of non-ignition 3.10 extinction safety time TSE time from the extinction of the monitored flame to the issuance of the command to cut off the gas supply 3.11 spark restoration control function of turning on the ignition device again without completely cutting off the gas supply in the case of unexpected flame failure 3.12 recycling control function of cutting off the gas supply immediately and restarting automatically according to the starting program in the case of unexpected flame failure of the combi-boiler during operation 3.13 safety shutdown safe de-energization of the main gas flow means as the result of the action of a controller, a safety device or the detection of an internal fault of the system 3.14 volatile lockout safety shutdown state in which, in addition to manual reset, the system can also be restarted by resuming power supply after power failure 3.15 non-volatile lockout safe shutdown state in which the system can only be restarted by manual reset 3.16 air proving device device for safely turning off the combi-boiler when there is an abnormal condition in air supply or burning fume emission 3.17 pneumatic gas/air ratio control system control system that adjusts the gas/air ratio of the output gas pressure by comparing the response of the air pressure (or differential pressure) 3.18 electronic gas/air ratio control system closed-loop control system composed of an electronic control module, an actuator (including at least a gas adjusting unit and an air flow adjusting unit) and a specified feedback signal, which is used for adjusting the gas/air ratio 3.19 nominal condensing output heat output of the reference gas used in the condensing boiler at the supply/return water temperature of 50°C/30°C, under the reference conditions specified in this standard 3.20 modular boiler combi-boiler consisting of two or more identical modules that may be operated independently under the same enclosure 3.21 common chamber of combustion products common flue for collecting fume in the modular boiler 3.22 fault tolerating time maximum tolerating time from the occurrence of fault in the combi-boiler to the safety action without causing any hazard 3.23 remote controller device for controlling the combi-boiler through wired or wireless connection in addition to a wired control device of the combi-boiler body 3.24 remote reset function function of resetting the combi-boiler from locked state to restart by remote control 3.25 intermittent/interrupted ignition burner cross-lighting burner ignition burner that has flame failure immediately after a main burner is ignited burner re-ignited by the flame of the main burner before the flame failure of the main burner 3.26 storage type combination boiler combination boiler in which flames and combustion products do not directly heat domestic hot water in storage tanks 4 Classification and models 4.1 Classification 4.1.1 Classification by utilization of water vapor in fume See Table 1 for classification by utilization of water vapor in fume. Table 1 Classification by utilization of water vapor in fume

Contents of GB 25034-2020

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and models 4.1 Classification 4.2 Model 5 Material, structure and safety requirements 5.1 Materials 5.2 Structure 5.3 Adjustment, control and safety devices 5.4 Remote controller 5.5 Additional requirements for modular boiler 6 Performance requirements 6.1 Tightness 6.2 Heat input and heat output 6.3 Operational safety 6.4 Adjustment, control and safety devices 6.5 Burning 6.6 Thermal efficiency 6.7 Domestic hot water performance 6.8 Antifreeze performance of outdoor combi-boiler 6.9 Durability of heat exchanger of condensing boiler 6.10 Noise 6.11 Electrical safety 6.12 Safety of electromagnetic compatibility 6.13 Risk assessment 7 Test methods 7.1 Test conditions and combi-boiler installation 7.2 Airtightness test 7.3 Heat input and heat output test 7.4 Operational safety test 7.5 Testing of adjusting, controlling and safety devices 7.6 Burning test 7.7 Thermal efficiency test 7.8 Domestic hot water performance test 7.9 Antifreeze performance test of outdoor combi-boiler 7.10 Durability test of condensing heat exchanger 7.11 Noise test 7.12 Test for electrical safety 7.13 Test for safety of electromagnetic compatibility 7.14 Risk assessment test 8 Inspection rules 8.1 End-of-manufacturing inspection 8.2 Type inspection 8.3 Inspection items and rejection classification 9 Marking and Instructions 9.1 Marking 9.2 Instructions 10 Packaging, transportation and storage 10.1 Packaging 10.2 Transportation 10.3 Storage Annex A (Informative) Classification by gas supply/exhaust installation method Annex B (Normative) Performance of carbon steel and stainless steel Annex C (Normative) Chemical composition of aluminium materials for casting Annex D (Normative) Properties of copper or copper alloy components Annex E (Normative) Minimum wall thickness of rolled components Annex F (Normative) Minimum wall thickness of (water) pressure casting components Annex G (Informative) Composition of automatic valve gas path Annex H (Normative) NOx test Annex I (Normative) Electrical safety of combi-boilers using AC power supply Annex J (Normative) Safety of electromagnetic compatibility Annex K (Normative) Risk assessment Annex L (Normative) Correction of thermal efficiency of condensing boiler with the return water temperature of 30°C Annex M (Normative) Test method for ignition time under rated heat input Annex N (Informative) Basic risk level Annex O (Informative) Safety protection measures Annex P (Informative) Examples of risk assessment Bibliography