1、CEN EN*625 75 E 3404589 Ol122801 8T2 BRITISH STANDARD 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 Standard NO COPYING WI
2、THOUT BSI PERMISSION EXCEPT AS PERMI!ITED BY COPYRIGHT LAW BS EN 625 : 1996 BS EN 625 : 1996 Amd. No. Committees responsible for this British Standard Date Rxt affected The preparation of this British Standard was entrusted to %chnical Committee GSE/29, Domestic gas-fired centrai heating boilers, up
3、on which the following bodies were represented: Association of Manufacturers of Domestic Unvented Supply Systems Equipment (MODUSSE) Boilers and Radiator Manufacturers Association Limited British Gas plc Department of the Environment (Building Research Establishment) Department of the Environment (P
4、roperty and Buildings Directorate) Department of Trade and Industry (Consumer Safety Unit, CA Division) Electricity Association Society of British Gas Industries Co-opted members This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the
5、authority of the Standards Board and comes into effect on 15 April 1996 O BSI 1996 The following ES1 references relate to the work on this standard: Committee reference GSE29 Draft for comment 92/71976 DC ISBN O 580 25367 8 Amendments issued since publication CEN EN*b25 95 3404589 0322802 739 BS EN
6、625 : 1996 Contents pw3e Committees responsible Inside front cover Foreword ii Text of EN 625 2 0 BSI 1996 i CEN EN*b25 95 W 3404589 0322803 675 W BS EN 625 : 1996 National fore word This British Standard has been prepared under the direction of the Engineering Sector Board and is the English langua
7、ge version of EN 625 : 1995 Gas-fired central heating boilers - Spec.cfzc requirements for the chnest.ic hot water operation of combination boilers of nominal heat input not emeeding 70 kW; published by the European Committee for Standardization (CEN). EN 625 was produced as the result of internatio
8、nal discussion in which the UK took an active part. There has previously been no direct British Standard equivalent to this standard. It is assumed that the execution of the provisions of this document is entrusted to suitably qualified and experienced persons. Cross-references Publication referred
9、to EN 297 : 1994 Corresponding British Standard BS EN 297 : 1994 Gas-fired central heating boilers - me B11 and BIBS boilers fitted with atmospMc bums of nominal heat input not exceeding 70 k?K BS EN 437 : 1994 Specijkation for test gases, test pressures and categoria of appliance, for gas appliance
10、s EN 437 : 1994 Compliance with a British Standard does not of itself confer immunity from legal obligations. ii O ES1 1996 CEN EN*625 95 3404589 0122804 501 W EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 625 September 1995 ICs 27.060.30; 91.140.10; 91.140.60 Descriptors: Heaters, gas applia
11、nces, centrai heating, water production, boilers, burners, definitions, equipment specifications, performance evaluation, tests, safety, energy, consumption, operating requirements, marking, name plates, classifications English version Gas-fired central heating boilers - Specific requirements for th
12、e 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 gal 70
13、kW 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 CENKENELEC Internal Regul
14、ations 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. This Eu
15、ropean 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 the na
16、tional standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr
17、Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 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 E page 2 EN 625 : 1996 Foreword This European Standard was prepared by Technical
18、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 prepar
19、ed 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 de
20、alt 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 o
21、f the EU or EETA. 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 CENXENELEC, the foilowing countries are bound
22、 to apply this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. For relationship with EU Directives, see informative annex ZA, which is an integral part of
23、 this standard. This European Standard shail 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 shail be withdrawn at the latest by March 1996. Contents Foreword 1 2 3 3.1 3.2 3.3 3
24、.4 3.5 3.6 3.7 3.8 3.9 Scope Normative references Definitions Combination boiler Summer operating mode Specific rate Nominal domestic hot water heat input Maximum water service pressure ”ank Thermal store Temperature relief valve Proportional control of the domestic hot water operation 3.10 Thermost
25、atic control of the 3.11 Temperature holding thermostat domestic hot water operation 4 4.1 4.2 4.3 4.4 5 5.1 5.2 Constructional requirements Materials and method of construction of components of the domestic water circuit Domestic water connections Soundness of the domestic water circuit Adjusting,
26、control and safety devices for the domestic hot water circuit Operational requirements General Safety of the domestic hot water circuit 5.2.1Instantaneous and storage types 5.2.2Instantaneous type 5.2.3Storage type 8.3 Rational use of energy 5.3.1Useful efficiency 5.3.2Losses 5.4 Fitness for purpose
27、 5.4.1Instantaneous and storage types - Specific rate 5.4.2Instantaneous type Page 2 4 4 4 4 4 4 5 5 5 5 5 5 5 6 6 O BSI 1996 CEN EN*b25 95 3404589 OL2280b 384 Page 3 EN 625 : 1995 6 Test methods 6.1 General 6. I. 1Adjustment of the domestic water pressure 6.1.20peration of the boiler 6.2 Safety of
28、the domestic hot water circuit 6.2.1Instantaneous and storage types 6.2.2Instantaneous type 6.2.3Storage type 6.3 Rational use of energy 6.3.1Useful efficiency 6.3.2Losses 6.4 Fitness for purpose 6.4.1Instantaneous and storage types - Specific water rate 6.4.2Instantaneous type 7 Marking and instruc
29、tions 7.1 Data plate of the boiler and/or the tank 7.2 Instructions 7.2. lTechnical instructions for the installer 7.2.2Operating instructions for the user Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives Figure 1 Illustr
30、ation of the test tank rig (see 6.3.2.1.3a) page 6 6 7 7 9 10 11 11 11 11 11 13 12 O BSI 1996 CEN ENxb25 95 3404589 0122807 210 Page 4 EN 625 : 1995 1 Scope This standard supplements standards EN 297, prEN 483 and prEN 677, hereafter called ?boiler standards?. It specifies the supplementary requirem
31、ents 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. The domestic hot water product
32、ion 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 only covers type testing. 2 Nor
33、mative 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, subsequent amendments to or revisio
34、ns 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 EN 297/prA2 EN 437 prEN 483 prEN 677 IS0 7-1 Gas-fired central heating boilers - Type B11 and
35、BBs boilers fitted with atmospheric burners of nominal heat input not exceeding 70 k W Gas-fred central heating boih - Tgpe B11 and B11 boilers fitted with atmospheric burners of nominal heat input not emeding 70 k W (determination of efficiency) lkst gases - %t press-ures - Appliance categories Gas
36、- fired central heating boilers with atmospheric burnm - Type C boilers of nominal heat input not exceeding 70 kW Gas-fired central heating boilers - Spekfic requirements for condensing boilers with nominal heat input not exceeding 70 kW Pipe threads where pressure-tight joints are made on the threa
37、ds - part 1: Designation, dimensions and tolerances IS0 228-1 Pipe threads where pressure-tight joints are not made on the threads - Part 1: Designation, dimensions and tolerances Copper tubes of circular section - Dimensions IS0 274 3 Definitions For the purposes of this standard the following defi
38、nitions 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?s declaration: - instantaneous type C
39、ombination 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? operating mode Operating mode in whic
40、h 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 per minute (lmin). 3.4 nomina
41、l domestic hot water heat input The value of the heat input in the domestic hot water mode indicated by the manufacturer. Symbol: Qnw; Unit: kilowatt (kW). 3.5 maximum water service pressure The maximum pressure permitted in the domestic water circuit, as declared by the manufacturer. Unit: bar. 3.6
42、 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 tank. Symbol: PMW; O BSI 1996 CEN ENab25 95 = 3404589 0122808 157 = 3.8 temperature relief valve A valve that opens automatically at a given temperat
43、ure of maximum 100 OC 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 d
44、omestic 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
45、 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 domest
46、ic 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 like
47、ly 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 corrosio
48、n resistant materials or shail be protected against corrosion. 4.2 Domestic water connections Threaded connections shall comply with IS0 228- 1 or IS0 7-1. If copper tubes are used for the connection, the end of the tube shall comply with IS0 274. In accordance with the manufacturers instructions, t
49、he 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 shail be separate. If an actuator or a control has a sliding shaft or a link with the diaphragm separating: Page 5 EN 625 : 1995 - the gas circuit and the heating water circuit; - the heating water circuit and the domestic water circuit; - the gas circuit and the domestic water circuit; there shall be an air vent between these circuits
