Domestic Hot Water Side Connection; Pressure-Resistant Connection - Austria Email EKH-S Bedienungsanleitung

12. DOMESTIC HOT WATER SIDE CONNECTION

12.1 PRESSURE-RESISTANT CONNECTION

In cases in which unsuitable or non-functional storage tank connection fittings are used as well as
in cases in which the stated operating pressure is exceeded, we shall refuse to guarantee the water
heater in any way whatsoever.
All water heaters that display a nominal pressure of 6 bar (ATO or kp/cm ) on their rating plates
2
are pressure resistant storage tanks and can be connected pressure-tight at a mains pressure of
up to 5.5 bar (ATO). If the system pressure is higher then a pressure reduction valve must be
installed in the cold water input pipe.
The water connection must only take place via a certified membrane safety valve or a membrane safety
valve combination - connection fitting for pressure resistant storage tanks.
A safety valve combination consists of shut-off, back-flow, drainage and safety valves with
expandable water outlet and is installed between the storage tank's cold water inlet pipe (blue) and
cold water inlet in an appropriate sequence.
The following must be observed:
In order to ensure the faultless functioning of the connection fittings these may only be installed in
frost-protected spaces. The outlet of the safety valve must be open and observable and/or the outlet
pipe from the drip tray (water overflow funnel) must not terminate outside so that neither frost nor
blockages due to dirt and the like can result in a malfunction. Care must be taken to ensure that the
drip container does not become blocked.
Furthermore, care must be taken to ensure that the outlet pipe of the safety valve is installed at a
steady incline.
No shut-off valve or any other restriction may be installed between the safety valve and the storage
tank cold water inlet.
The safety valve must be configured for a trigger pressure that is lower than the nominal pressure (6
bar) of the storage tank. Before the final connection of the storage tank the cold water inflow pipe
must be flushed through. The discharge openings of the safety valves (domestic water and heating
circuits) must open out into an appropriate drainage object in order to avoid any damage caused by
the escape of operating fluid.
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Id.Nr.: 243701-0