BS EN 12977-2:2018 pdf download.Thermal solar systems and components – Custom built systems Part 2: Test methods for solar water heaters and combisystems.
5 System classification See EN 12977-1:2018, Clause 5.
6 Test methods 6.1 Introduction Subsequent test methods refer to the requirements given in EN 12977-1:2018. 6.2 General 6.2.1 Suitability for drinking water See EN 806-1. 6.2.2 Water contamination Check the design of all circuits to avoid water contamination for backflow from all circuits to drinking main supplies. 6.2.3 Freeze resistance See EN 12976-2:2017, 5.1. 6.2.4 High-temperature protection 6.2.4.1 Scald protection If the temperature of the domestic hot water in the system can exceed 60 °C, check the design plan or the system documentation to see whether the system is provided with an automatic cold water mixing device or any other device to limit the maximum tapping temperature to 60 °C. 6.2.4.2 High-temperature protection of materials Ensure by checking the hydraulic scheme and/or by calculation and taking into account the most adverse conditions for the materials of all parts of the system, that the maximum temperatures which may occur do not exceed the maximum permissible temperatures for the respective materials, taking into account also pressure conditions and/or mechanical stress if relevant. NOTE Both transients (high temperature peaks of short duration) and stagnation of longer duration may create adverse conditions for the respective material.
7 Optional performance test of small custom built solar heating systems 7.1 General The test method is based on component tests of the solar collector, the store(s), the controller and other components as necessary. These component tests are described in 7.2, 7.3 and 7.4. The whole system is then simulated using a validated simulation program as described in 7.6. The long-term performance of the whole system is predicted for reference conditions as described in 7.7. If the carrying out of this performance test is required, the specification included in 7.5 and 7.6 shall be adhered to. In general, the system does not need to be installed as a whole for testing. For systems for hot water preparation only (class A), for systems for space heating only (class B) and for systems for combined domestic hot water preparation and space heating (class C), the full tests should be carried out including the long-term performance prediction for reference conditions.BS EN 12977-2 pdf download.