This standard specifies the terms and definitions, classification and model, requirements for material, structure and safety, performance requirements, test method, inspection rules, marking, precaution and instruction as well as packing, transport and storage with regards to the gas-fired heating and hot water condensing combi-boilers (hereinafter referred to as "condensing boilers").
This standard is applicable to such condensing boilers: nominal heat input is not greater than 70kW; maximum heating operating water pressure is not greater than 0.3MPa; the water temperature is not greater than 95℃ in the operation; the blower atmospheric burner or full premix burner is adopted. The condensing boilers with nominal heat input greater than 70 kW may refer to this standard.
This standard is applicable to the heating and hot water or heating condensing boilers.
This standard is applicable to the condensing boilers fired by natural gas, liquefied petroleum gas and manufactured gas in conformity with those specified in GB/T 13611.
This standard is not applicable to condensing boilers of the following types:
——Natural draught flue type and natural draught balance type;
——Outdoor type;
——Positive displacement;
——Condensing boilers adopting two sets of independent combustion systems respectively for heating and hot water in the same enclosure, including the boilers with common flue.
Foreword I 1 Scope 2 Normative References 3 Terms and Definitions 4 Classification and Model 5 Material, Structure and Safety 6 Requirements 7 Test Method 8 Inspection Rules 9 Marking, Precaution and Instructions 10 Packing, Transport and Storage Appendix A (Informative) Structural Changes between this Standard and EN 677:1998 Appendix B (Informative) Technical Differences between this Standard and EN 677:1998 and their Reasons Appendix C (Normative) Correction for the Determined Efficiency in the Low Water Temperature Test of Condensing Boilers Appendix D (Informative) Clauses Number of this Standard Addressing Basic Requirements in GB 16914-2003
