3.18 Sealed water systems
The installation must comply with the appropriate requirements of the current issue of BS4814,
BS5449, BS6759, BS6798 and BS7074 Part 1 and 2. For IE your attention is drawn to the
current edition of IS 813. It is highly recommend to use the Vaillant Sealed System Kit Article;
020053207 This includes all necessary compo-nents and is included in your Vaillant warranty.
See fig 3.10.
3.18.1 Safety valve
A safety valve must be fitted to a sealed system.
It shall be preset, non-adjustable with a lift pressure of 3-bar, incorporating seating of a resilient
material, a test device and a connection for drain.
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