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BS EN 12897:2016

BS EN 12897:2016

$167.15

Water supply. Specification for indirectly heated unvented (closed) storage water heaters

Published By Publication Date Number of Pages
BSI 2016 36
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This European Standard specifies the constructional and performance requirements and methods of test for indirectly heated, unvented (closed) storage water heaters of up to 2 000 l volume suitable for connection to a water supply at a pressure between 0,05 MPa and 1,0 MPa (0,5 bar and 10 bar), and fitted with control and safety devices designed to prevent the temperature of the stored drinking water from reaching 95 °C. Whilst storage water heaters intended primarily for direct heating are not covered by this standard, it does allow the provision of electric heating elements for auxiliary use.

PDF Catalog

PDF Pages PDF Title
4 Contents Page
6 European foreword
7 Introduction
8 1 Scope
2 Normative references
3 Terms, definitions and symbols
9 3.1 Terms and definitions
10 3.2 Symbols
4 Requirements
4.1 Constructional requirements
4.1.1 Inspection access
4.1.2 Draining
4.1.3 Hydraulic connections
4.2 Temperature control
11 4.3 Mechanical resistance and stability
4.3.1 Pressure resistance of water storage vessel
4.3.2 Pressure resistance of primary heater
4.3.3 Durability
4.3.3.1 General
4.3.3.2 Water heaters without inlet pressure and system expansion control
4.3.3.3 Water heaters designed for use with expansion vessels or internal expansion space
12 Figure 1 — Diagram of test pressure cycle variations
Figure 2 — Pressure control options
13 4.3.4 Leakage test on double-walled primary heater
4.4 Safety equipment
4.4.1 General
4.4.2 Energy cut-out device
4.4.3 Temperature relief valve
4.4.4 Pressure relief/expansion valve
4.4.5 Pressure reducing valve
14 4.4.6 Provision for expansion
4.4.7 Backflow prevention
5 Marking
6 Evaluation of conformity
6.1 General
6.1.1 Compliance testing
15 6.1.2 Market surveillance
6.2 Initial type testing
6.2.1 General
6.2.2 Actual volume
6.2.3 Rated storage volume
Table 1 — Tolerance on storage volume
6.2.4 Hot water volume
16 6.2.5 Primary heating power (heat exchanger performance)
6.2.6 Durability testing
6.2.7 Double-walled primary heaters
6.2.8 Standing heat loss
6.2.9 Pressure resistance
6.2.10 Temperature control devices
6.2.11 Heat exchanger pressure drop
6.3 Production testing
17 6.4 Factory production control (FPC)
7 Technical documents
7.1 General
7.2 Assembly and maintenance instructions
18 7.3 Operating instructions
19 Annex A (normative) Hot water safety and performance testing
A.1 Tests required
Table A.1 — Performance testing requirements
A.2 Test apparatus and tolerances
A.2.1 General
20 Figure A.1 — Apparatus
A.2.2 Description of components
21 A.3 Performance tests
A.3.1 Hot water performance
22 Table A.2 — Domestic hot water flow rate
A.3.2 Primary heater pressure drop
23 A.4 Interpretation and calculation of hot water performance results
A.4.1 Hot water capacity calculations
A.4.2 Calculation of Reheat performance
A.4.3 Calculation of V40 (equivalent volume of “mixed” water available at 40 C)
24 A.5 Function of safety devices
25 Annex B (normative) Measurement of standing heat loss for factory insulated storage water heaters
B.1 General
Table B.1 — Thickness of insulation according to size of pipe or connection
B.2 Apparatus
26 Figure B.1 — Standing Heat Loss Test Apparatus
27 B.3 Test Procedure
28 Figure B.2 — Temperature regime (first three cycles)
B.4 Calculation of Results
30 Annex C (informative) Inspection access
Table C.1 — Openings for inspection and cleaning (including effective heating surfaces)
31 Table C.2 — Openings for cleaning and inspection
32 Annex ZA (informative) Relationship between this European Standard and the requirements of Commission Delegated Regulation (EU) No 812/2013 of 18 February 2013 supplementing Directive 2010/30/EU regarding energy labelling for water heaters and hot w…
Table ZA.1 — Correspondence between this European Standard and Commission Delegated Regulation (EU) No 812/2013
33 Annex ZB (informative) Relationship between this European Standard and the requirements of Commission Regulation (EU) No 814/2013 of 2 August 2013 implementing Directive 2009/125/EC with regard to Ecodesign requirements for water heaters and hot wat…
Table ZB.1 — Correspondence between this European Standard and Commission Regulation (EU) No 814/2013
34 Bibliography

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BS EN 12897:2016
$167.15