DIN 4757-1 E : 1980

1 Scope<br>2 Preconditions<br>3 Concepts<br>4 Classification of solar heating plants<br>5 Safety requirements relating to materials, type and <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;manufacture<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.1 Materials<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.2 Applicability of the materials<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.3 Solar collectors<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.4 Pipelines<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.5 Heat accumulators<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.6 Heat exchangers<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.7 Expansion vessels<br>6 Equipment<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.1 Safety devices for open plants in accordance <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with sub-clause 4.1<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.2 Safety devices for closed plants in accordance<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with sub-clause 4.2<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.3 Further equipment<br>7 Heat transfer medium<br>8 Installation<br>9 Testing<br>10 Operating instructions

Applies to open and closed solar heating plants with natural circulation (thermosiphon or gravity circulation) and with forced circulation in accordance with sub-clause 4.1 and sub-clause 4.2. The hear transfer media used include water, water with the addition of antifreezes and synthetic heat transfer media which are mixed with water, and which have a boiling point of the mixture situation above the boiling point of the water. This mixture must be non-combustible. DIN 4757 Part 2 applies to solar heating plants operating on organic heat transfer media.