AE EHT 50I Operating And Mounting Instructions Manual page 24

Electric water heater EHT - 50, 80, 100, 120, 150 litres
After completed plumbing and bubble-free filling of the storage tank, the connector fitting must be
checked for functionality.
a) In order to avoid a blockage of the venting facility of the safety valve due to furring, the venting
facility of the safety valve must be operated from time to time during operation of the system. It
must be observed whether the valve closes again after releasing the venting facility and whether
the water in place runs off completely through the funnel or the blow-off pipe.
b) For safety valves installed ahead of water heaters, it must be observed whether the safety valve
responds during heating of the water heater. This can be identified by the exit of water from the
blow-off pipe.
Implementation: operator, plumber
Time interval: every 6 months
Maintenance and repairs:
If no water exits during heating of the water heater or in the event of a permanent leak of the safety
valve, an attempt must be made to loosen the valve by repeated operation of the venting facility or to
rinse out any possible foreign object (e.g. fur particle) on the sealing unit.
If this cannot be achieved, appropriate repairs by a plumber must be initiated. The complete safety
valve must be replaced in the case of any damage to the valve seat or sealing ring.
Implementation: plumber
Time interval: yearly
To test the non-return valve, the shutoff valve is closed and no water must run out of the opened test
valve.
The storage tank is operated using the hot water valve of the service fitting (mixer tap). As a result, the
storage tank is constantly under line pressure. To protect the internal boiler from overpressure during
heating, the appearing expansion water is discharged through the safety valve.
In order to avoid damages to the hot water tank from overpressure, it is absolutely necessary to
replace any furred safety valves. The non-return valve prevents the hot water from flowing back into
the cold water supply net in the case of a loss of line pressure, thus protecting the boiler from heating
up without water. Using the shutoff valve, the storage tank can be separated in relation to water and
thus also from the cold water supply network, and emptied through the drain valve, if required.
In order to allow for a trouble-free repair, a removal or exchange of the device, it is necessary to
establish the connection of the tank by means of a detachable connection (Dutch). Tank leaks as a
result of an improper connection and resulting damage and consequential damage are excluded from
the warranty and product liability.
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