iNSTallaTiON
Maintenance
32 | WWK222-302 H www.stiebel-eltron.com
15.5 Descaling the electric emergency/booster
heater
Only descale the flange of the emergency/booster heater after
disassembly. Never treat the inside of the DHW cylinder or the
impressed current anode with descaling agents. The electric
emergency/booster heater is screwed into the DHW cylinder of
the appliance at a central point at the top.
D0000039351
1
1 Electric emergency/booster heater with protective anode
15.6 Valves
Regularly check the valves in the system (safety valve, pressure
reducing valve, drain valve) to ensure the operational reliability
of the appliance. The amount of limescale deposits depends on
the local water quality.
Check all valves in the system and remove limescale deposits.
Replace the valves if necessary.
Check the function of the valves.
15.7 Condensate drain
Check whether the condensate drain is clear of obstructions.
Remove any dirt.
15.8 Replacing the power cable
WARNING Electrocution
The power cable must only be replaced (for example if
damaged) by a qualified contractor.
Fitting the casing ring
WARNING Electrocution
Reconnect the earth cable to the casing ring.
D0000034814
Fit the upper casing ring. The casing ring overlaps along the
joint. A tab on one end clips into the recess at the other end
of the casing ring.
Secure the casing ring with screws.
Fit the pipe collar of the condensate drain and the conden-
sate drain bend.
15.9 Protective anode and battery change
The appliance is equipped with a maintenance-free impressed
current anode that protects the cylinder from corrosion when it
is connected to the power supply. At the factory, the appliance is
fitted with rechargeable batteries that ensure the power supply
to the impressed current anode in the case of a power failure.
The appliance power supply must not be interrupted for more
than 16hours.
If the power supply is regularly interrupted by a switching con-
tact or the security of supply is inadequate, the batteries of the
impressed current anode must be replaced every three years.
Failure to comply may result in damage to the appliance. If regular
interruptions to the power supply are not anticipated and there
is security of supply, no maintenance of the batteries is required
and the appliance is maintenance-free in this regard.
!
Material losses
Never use batteries that cannot be charged. Only re-
chargeable NiMH batteries are permissible.
Batteries may be damaged in the appliance. Without a
power supply, the impressed current anode and the cyl-
inder would not be protected against corrosion.
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