Decommissioning, Draining - Austria Email EKH-S Bedienungsanleitung

15. DECOMMISSIONING, DRAINING

If a water heater is put out of action or remains unused for a lengthy period then it must be drained
and completely isolated (at all poles) from the power supply. Switch off the supply line switches or
automatic circuit breakers.
In rooms permanently susceptible to frost damage the water heater must be drained before the
start of the cold weather season if the device will be out of action for several days and is not being
operating in frost protection mode (see page 6, point 6).
The draining of the domestic water is carried out once the shut-off valve has been closed in the cold
water feed via the drainage valve of the safety valve combination whilst all hot water valves of the
connected operating mechanisms are simultaneously open. It is also possible to drain the system via
the safety valve in the excess water funnel (drip tray). In order to do so the safety valve knob is turned
to the "Test" position.
Careful: hot water can escape when draining.
Furthermore, when there is a risk of frost, attention must also be paid to the fact that not only the
water in the water heater and in the hot water plumbing can freeze but also in the all cold water
pipework leading to the operating mechanisms and to the device itself. It is therefore useful to
drain off all water-carrying fittings and plumbing (including the heating circuit = smooth pipe heat
exchanger) right back to the frost protected part of the household water system (household water
connection).
If the storage system is brought back into service then it is crucial to ensure that it is filled with water
and that bubble-free water emerges at the hot water valves.
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