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22 Id.Nr. 235161-13
11. SHUTTING DOWN, EMPTYING
If the water heater will be shut down or not used for an extended period of time, disconnect it completely from the mains (for
electric heating models) by turning o the power switch or circuit breaker.
In frost-prone areas the water heater must be empties before the cold time of year if the appliance will not be used for several
days.
Empty the service water - after closing the shut-o valve in the cold water supply line - by opening the drain valve on the
safety valve combination and simultaneously opening all hot water vales on the connected ttings.
Partial emptying can also be accomplished through the safety valve into the expansion water funnel (drip catch). For this the
safe valve should be turned to the ...M... position.
Caution: Hot water can splash when emptying the tank!
When there is a risk of freezing, note that not only the water in the water heater and in the hot water lines can freeze, but
also in all cold water lines to the ttings and to the appliance itself. It is therefore recommended that you empty all water-
carrying ttings and lines (including the heater circuit = register) all the way back to the frost-safe section of the water utility
connection on the house.
When the water heater is restarted, be sure that it is lled with water and water runs out of the ttings without air
bubbles. In addition, as with the rst commissioning, the tank and all connections must be checked for leaks.
12. INSPECTION, MAINTENANCE, CARE
a) During the heat-up phase the expansion water must drip noticeably from the safety valve drain. When fully heated
(~ 80° C) the expansion water makes up approximately 3.5% of the rated capacity of the water heater.
Regularly check for proper function of the safety valve. When lifting or turning the safety valve test knob to the Test
position, the water must ow unhindered from the safety valve body into the funnel.
Caution: The cold water inlet and parts of the water heater tting can get hot during this process. If the tank is not heated
up or hot water removed, no water is allowed to drip from the safety valve. If this is the case, either the water line pressure
is greater than the permitted value or the safety valve is defective. If the water line pressure is greater than permitted, a
pressure reducing valve must be used.
b) If the service water has a high lime content, removal of the scale formed in the interior boiler as well as of the free lime
particles must be performed by a technician every one to two operating years. Cleaning is done through the ange
opening – remove heater ange, clean tank, and use a new gasket when reassembling the ange. The screws must be
tightened in a cross pattern with a tightening torque of 23 Nm - 25 Nm. The special enameled inner container of the water
heater must never come into contact with scale solvent. Do not work with the decalcication pump! Then ush the unit
thoroughly and perform the heat-up cycle as for initial startup of the unit.
c) In order to make a legitimate claim under the guarantee provided by the manufacturer, the in-built protective anode
requires a documented inspection by a specialist at a maximum interval of 2 years of operation. For service work, it is also
appropriate to open the cleaning and service ange, in order to check the tank for the possible ingress of foreign bodies
and impurities and to remove them if necessary.
The impressed current anode has a virtually unlimited service life. Its function must be regularly monitored via the control
lights (green, yellow, red).
Warning: If the red LED is lit, no corrosion protection is active! Corrosion protection is only guaranteed if the green LED
lights up continuously.
Should the red or yellow LED light up or ash, please inform Customer Services immediately.
A conductivity value of the medium of ≥ 150 μS/cm is necessary for proper functioning of the external current anode.
d) Never use abrasive cleaners or paint thinners (such as nitro solvents, trichloro-ethylene, etc.) for cleaning the unit. Recom-
mended is a damp cloth with an additional few drops of liquid household cleaner. In hospitals and other public buildings,
the prevailing regulations for cleaning and disinfection must be observed.
e) The water heater may be used only according to the conditions specied on the specication label. In addition to
the legally recognized national codes and norms, the connection specications of the local electric and water utility
companies as well as the installation and operating guide must be followed.
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