1、BRITISH STANDARD BS 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 The European Standard EN 625:1995 has the status of a British StandardBSEN 625:1996 This British Standard, hav
2、ing been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comesintoeffect on 15 April 1996 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference GSE/29 Draft for comment 92/71976 DC ISB
3、N 0 580 25367 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee GSE/29, Domestic gas-fired central heating boilers, upon which the following bodies were represented: Association of Manufacturers of Domestic Unvented Suppl
4、y Systems Equipment (MODUSSE) Boilers and Radiator Manufacturers Association Limited British Gas plc Department of the Environment (Building Research Establishment) Department of the Environment (Property and Buildings Directorate) Department of Trade and Industry (Consumer Safety Unit, CA Division)
5、 Electricity Association Society of British Gas Industries Co-opted members Amendments issued since publication Amd. No. Date CommentsBSEN 625:1996 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 625 5 List of references Inside back co
6、verBSEN 625:1996 ii BSI 08-1999 National foreword This British Standard has been prepared under the direction of the Engineering Sector Board and is the English language version of EN 625:1995 Gas-fired central heating boilers Specific requirements for the domestic hot water operation of combination
7、 boilers of nominal heat input not exceeding 70 kW, published by the European Committee for Standardization (CEN). EN 625 was produced as the result of international discussion in which the UK took an active part. There has previously been no direct British Standard equivalent to this standard. It i
8、s assumed that the execution of the provisions of this document is entrusted to suitably qualified and experienced persons. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance
9、with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard EN 297:1994 BS EN 297:1994 Gas-fired central heating boilers Type B 11and B 11BSboilers fitted with atmospheric burners of nominal heat input not
10、 exceeding 70 kW. EN 437:1994 BS EN 437:1994 Specification for test gases, test pressures and categories of appliance, for gas appliances Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 16, an inside back cover and a back c
11、over. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 625 September 1995 ICS 27.060.30; 91.140.10; 91.140.60 Descriptors: Heaters
12、, gas appliances, central heating, water production, boilers, burners, definitions, equipment specifications, performance evaluation, tests, safety, energy, consumption, operating requirements, marking, name plates, classifications Englishversion Gas-fired central heating boilers Specific requiremen
13、ts for the domestic hot water operation of combination boilers of nominal heat input not exceeding 70 kW Chaudires de chauffage central utilisant les combustible gazeux Exigences spcifiques la fonction eau chaude sanitaire des chaudires deux services dont le dbit calorifique nominal est infrieur ou
14、gal 70kW Heizkessel fr gasfrmige Brennstoffe Spezielle Anforderungen an die Trinkwasserseitige Funktion von Kombi-Kesseln mit einer Nennwrmebelastung kleiner als oder gleich 70 kW This European Standard was approved by CEN on 1995-03-06. CEN members are bound to comply with the CEN/CENELEC Internal
15、Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. Th
16、is European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are t
17、he national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee
18、 fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN 625:1995 EEN625:1995 BSI 08-1999 2 Foreword This European Standard was prepared by Technic
19、al Committee CEN/TC 109, Central heating boilers using gaseous fuels, of which the secretariat is held by NNI. Other types of boiler including boilers of higher nominal heat input which are excluded from this European Standard are dealt with in separate standards. This European Standard has been pre
20、pared under a mandate granted to CEN by the European Commission and the European Free Trade Association, and supports the essential requirements of the EU Directive. In particular, matters which relate to quality assurance systems, production tests and the certification of auxiliary controls are not
21、 dealt with in this standard. In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this standard: 1) This standard provides no information as to whether the product may be used without restriction in any of the member states
22、 of the EU or EFTA. 2) It should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. In compliance with the common rules of CEN/CENELEC, the following countries are bo
23、und to apply this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. For relationship with EU Directives, seeinformative Annex ZA, which is an integral part
24、 of this standard. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 1996, and conflicting national standards shall be withdrawn at the latest by March 1996.EN625:1995 BSI 08-1999 3 Contents P
25、age Foreword 2 1 Scope 5 2 Normative references 5 3 Definitions 5 3.1 Combination boiler 5 3.2 “Summer” operating mode 5 3.3 Specific rate 5 3.4 Nominal domestic hot water heat input 5 3.5 Maximum water service pressure 5 3.6 Tank 5 3.7 Thermal store 5 3.8 Temperature relief valve 6 3.9 Proportional
26、 control of the domestic hot water operation 6 3.10 Thermostatic control of the domestic hot water operation 6 3.11 Temperature holding thermostat 6 4 Constructional requirements 6 4.1 Materials and method of construction of components of the domestic water circuit 6 4.2 Domestic water connections 6
27、 4.3 Soundness of the domestic water circuit 6 4.4 Adjusting, control and safety devices for the domestic hot water circuit 6 5 Operational requirements 6 5.1 General 6 5.2 Safety of the domestic hot water circuit 7 5.2.1 Instantaneous and storage types 7 5.2.2 Instantaneous type 7 5.2.3 Storage typ
28、e 7 5.3 Rational use of energy 7 5.3.1 Useful efficiency 7 5.3.2 Losses 7 5.4 Fitness for purpose 7 5.4.1 Instantaneous and storage types Specific rate 7 5.4.2 Instantaneous type 7 6 Test methods 8 6.1 General 8 6.1.1 Adjustment of the domestic water pressure 8 Page 6.1.2 Operation of the boiler 8 6
29、.2 Safety of the domestic hot water circuit 8 6.2.1 Instantaneous and storage types 8 6.2.2 Instantaneous type 8 6.2.3 Storage type 9 6.3 Rational use of energy 9 6.3.1 Useful efficiency 9 6.3.2 Losses 9 6.4 Fitness for purpose 11 6.4.1 Instantaneous and storage types Specific water rate 11 6.4.2 In
30、stantaneous type 11 7 Marking and instructions 12 7.1 Data plate of the boiler and/or the tank 12 7.2 Instructions 12 7.2.1 Technical instructions for the installer 12 7.2.2 Operating instructions for the user 12 Annex ZA (informative) Clauses of this EuropeanStandard addressing essential requiremen
31、ts or other provisions of EU Directives 14 Figure 1 Illustration of the test tank rig see 6.3.2.1.3 a) 13 Table ZA.1 15 Table ZA.2 16 Table ZA.3 164 blankEN625:1995 BSI 08-1999 5 1 Scope This standard supplements standards EN 297, prEN 483 and prEN 677, hereafter called “boiler standards”. It specif
32、ies the supplementary requirements and tests for the construction, safety, rational use of energy, fitness for purpose, classification and marking related to the domestic hot water operation of combination boilers. The domestic hot water is produced by either the instantaneous or storage principle.
33、The domestic hot water production is integrated or coupled, and the whole being marketed as a single unit. This standard does not apply to two appliances included in the same case which operate independently of each other, a boiler and a water heater, even if they have a common flue. This standard o
34、nly covers type testing. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For the dated references, subse
35、quent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 297:1994, Gas-fired central heating boilers Type B 11and B 11BSboilers fit
36、ted with atmospheric burners of nominal heat input not exceeding 70 kW. EN 297/prA2, Gas-fired central heating boilers Type B 11and B 11BSboilers fitted with atmospheric burners of nominal heat input not exceeding 70 kW (determination of efficiency). EN 437, Test gases Test pressures Appliance categ
37、ories. prEN 483, Gas-fired central heating boilers with atmospheric burners Type C boilers of nominal heat input not exceeding 70 kW. prEN 677, Gas-fired central heating boilers Specific requirements for condensing boilers with nominal heat input not exceeding 70 kW. ISO 7-1, Pipe threads where pres
38、sure-tight joints are made on the threads Part 1: Designation, dimensions and tolerances. ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads Part 1: Designation, dimensions and tolerances. ISO 274, Copper tubes of circular section Dimensions. 3 Definitions For the purpos
39、es of this standard the following definitions apply. 3.1 combination boiler boiler designed both for central heating and for the production of domestic hot water. Depending on its type of domestic hot water production, the combination boiler is classed as follows, in accordance with the manufacturer
40、s declaration instantaneous type Combination boilers which can continuously supply the specific domestic hot water rate D stated by the manufacturer. storage type Combination boilers which can intermittently supply the specific domestic hot water rate D stated by the manufacturer. 3.2 “summer” opera
41、ting mode operating mode in which the boiler only provides heating of the domestic water 3.3 specific rate the domestic hot water rate declared by the manufacturer, corresponding to a mean temperature rise of 30 K, that the boiler can supply in two successive delivery periods Symbol: D; Unit: litres
42、 per minute (l/min). 3.4 nominal domestic hot water heat input the value of the heat input in the domestic hot water mode indicated by the manufacturer Symbol: Q nw; Unit: kilowatt (kW). 3.5 maximum water service pressure the maximum pressure permitted in the domestic water circuit, as declared by t
43、he manufacturer Symbol: P MW; Unit: bar. 3.6 tank reservoir of domestic water 3.7 thermal store heat reservoir sited mainly in heating water, as opposed to the domestic hot water storage in the tankEN625:1995 6 BSI 08-1999 3.8 temperature relief valve a valve that opens automatically at a given temp
44、erature of maximum 100 C to discharge the domestic hot water 3.9 proportional control of the domestic hot water operation means of control in which the gas rate is subordinated proportionally to the domestic hot water rate; the proportioning factor may be adjustable 3.10 thermostatic control of the
45、domestic hot water operation means of control in which the gas rate is subordinated to a thermostatic device controlling the domestic hot water temperature, the set point of the device may be adjustable 3.11 temperature holding thermostat a device which maintains the water in the tank or the thermal
46、 store at a given temperature 4 Constructional requirements It is checked that the assembly meets constructional requirements by visual examination of the boiler and possibly the tank, and also by inspection of the technical file. 4.1 Materials and method of construction of components of the domesti
47、c water circuit Materials shall be appropriate for their use, under intended application and at the maximum water pressure stated by the manufacturer. The requirements relating to thermal insulation and its use specified in the “boiler standards” only apply to parts of the domestic water circuit lik
48、ely to come into contact with flames or sited close to the combustion products outlet. The materials of the parts containing domestic water shall not affect the quality of the domestic water in respect of either health or taste. The whole of the domestic hot water circuit shall be made up of corrosi
49、on resistant materials or shall be protected against corrosion. 4.2 Domestic water connections Threaded connections shall comply with ISO 228-1 or ISO 7-1. If copper tubes are used for the connection, the end of the tube shall comply with ISO 274. In accordance with the manufacturers instructions, the domestic water circuit shall be able to be drained, without the discharge of water compromising electrical safety. 4.3 Soundness of the domestic water circuit The domestic hot water circuit and the heating circuit
