14
Id.Nr.: 228843-13
Electric water heater EKA, EKR, EWH, EKL
a) To avoid limescale deposits from obstructing the air introduction system of the safety
valve, operate the air introduction system of the safety valve from time to time during
the operation of the facility. Check whether the valve closes once the air introduction
system is released and whether the water drains completely through the funnel or
the bleeding line.
b) Where safety valves are fitted in front of water heaters, observe if the safety valve
responds when the water heater heats up. This can be ascertained by checking that
water exits the bleeding line.
To be performed by:
Operator, installation company
Interval:
every 6 months
Maintenance and repair:
If no water exits when the water heater heats up or if the safety valve permanently leaks,
try to activate the air introduction system repeatedly to get the valve unstuck or flush
out foreign matter (for instance limescale particles) that might obstruct the sealing part.
If this is not successful, get an installation company to carry out the repair. If the valve
seat or sealing shim is damaged, the safety valve must be replaced completely.
To be performed by:
Installation company
Interval:
once per year
To check the non-return valve, close the stop valve. If water exits through the open test
valve, the non-return valve does not function properly.
The operation of the storage tank is effected by the hot water valve of the fitting (mixer
tap). Therefore, the storage tank is constantly exposed to line pressure. To protect the
interior tank against overpressure during the heating process, the expansion water is let
off through the safety valve. To avoid overpressure damage to the water heater, it is very
important that calcified safety valves are replaced. In the event of a line pressure drop,
the non-return valve prevents the hot water from flowing back into the cold water supply
network. In this way, the boiler is protected against heating without water. The stop valve
allows the storage tank to be separated from the cold water supply network, shutting
out the water and pressure. If required, the storage tank can now be drained through
the drain valve.
