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4 Installation, commissioning
4.2.2
Water treatment for different types of raw water
Up to 20° f
Over 20° f
4.2.3
Technical safety equipment
The technical safety equipment such as safety valves, pressure limiters, water minimum
level protection devices and expansion vessels must be specified and executed in accor-
dance with the valid national regulations and standards (for example SWKI Directive, EN
12828, EN 12953).
The drain lines of safety valves must be routed at a downward angle away from the valve
to the drain. It is essential to ensure that scalding caused by hot water or steam is
prevented by effective and suitable pipe configurations.
4.2.4
Filling with circulation water
Before the system is started, the heat generation system and water distribution system
must be filled with circulation water and tested for tightness. Operation of the system is
only permitted when it is completely full.
D-42
Add hardness stabilisers and an alkalising agent
Softening through ion exchange to 0° f hardness and addition of an
alkalising agent. Large systems (e.g. piped heating networks) may
require complete softening and alkalisation
Underfeed grate UTSK
1.10 en
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