Emergency Shutdown; Maintenance And Care; Troubleshooting - STIEBEL ELTRON WWK 221 electronic Bedienung Und Installation

oPerATIoN

Maintenance and care

4.4

Emergency shutdown

In the event of an emergency, carry out the following steps:
f Interrupt the power supply by unplugging the appliance from f
the mains or by tripping the MCB.
f Shut off the cold water supply. f
f Immediately notify a qualified contractor, as the appliance f
is not protected against corrosion while the power supply is
interrupted.
5. Maintenance and care
WARNING Electrocution
- Only clean the exterior of the appliance.
- Never open the appliance.
- Do not insert objects through the grille into the in-
terior of the appliance.
- Never spray the appliance with water.
- Never spray water into the appliance.
WARNING Injury
!
Maintenance work, such as checking electrical safety,
must only be carried out by a qualified contractor.
Appliance Care and maintenance tips
components
Casing Use a damp cloth to clean the casing sections. Never use
abrasive or corrosive cleaning agents.
Air intake grille Clean the air intake grille and air discharge grille every six
/ air discharge months. Cobwebs or other kinds of contamination can re-
grille strict the air supply to the appliance.
DHW cylinder The DHW cylinder is equipped with a maintenance-free
impressed current anode to protect it against corrosion. The
power supply must not be interrupted while the appliance is
filled with water to enable the impressed current anode to
provide protection. Otherwise there is a risk of corrosion.
Electric emer- Have the electric emergency/booster heater descaled from
gency/booster time to time. This will extend the service life of the electric
heater emergency/booster heater.
appliance Have the safety assembly and the evaporator checked regu-
larly by a qualified contractor.
Condensate Undo the condensate drain. Check that the condensate drain
drain is clear and remove any dirt from the "Condensate drain"
connection.
Scaling
Almost every type of water will deposit limescale at high temper-
atures. This settles inside the appliance and affects both perfor-
mance and service life. A qualified contractor who knows the local
water quality will tell you when the next service is due.
f Check the taps regularly. Limescale deposits at the tap out- f
lets can be removed using commercially available descaling
agents.
f Regularly activate the safety valve to prevent it from becom- f
ing blocked, e.g. by limescale deposits.
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6.

Troubleshooting

Note
At various points, reference is made to the appliance pa-
rameters. See chapter "Specification".
Fault Cause
The compressor If the appliance is in de-
is operational, frost mode, the fan may
but the fan is not switch on again until
off. the maximum defrost
time has been exceeded.
The defrosting process is
shown on the display.
No hot water is No power at the appliance. Check that the appliance is con-
available.
A fuse in the distribution
board has blown.
The intake air temperature
is outside the application
limits (see "Specification /
Data table" chapter). The
compressor was switched
off/locked automatically.
The appliance output data
is calculated according to
the relevant standards,
using the intake tem-
perature specified in the
data table. Below this
temperature the appliance
efficiency and output de-
crease. The heat-up time is
extended.
If the heat pump runtime
is very long, this may be
due to an excessively low
intake temperature.
The set tem- Subject to intake temper-
perature is not ature and hot gas temper-
achieved. ature, the appliance may
temporarily reduce the set
temperature to the actual
value captured by the inte-
gral sensor.
The safety valve The appliance cylinder is
of the DHW at mains water pressure.
cylinder is drip- During the heat-up pro-
ping. cess, expansion water will
drip from the safety valve.
remedy
No action required. A maximum
defrost time is set in the appli-
ance. If, despite the defrost, the
defrost end temperature is not
reached within the maximum
defrost time, a fault code ap-
pears. Please consult a quali-
fied contractor.
nected to the power supply.
Check whether the fuses in
your distribution board have
blown. If required, disconnect
the appliance from the power
supply and replace the fuses/
reset the MCBs. Contact your
qualified contractor if the fuse/
MCB blows/trips again after the
appliance is re-connected to the
power supply.
No action required. The ap-
pliance heats the water using
the electric emergency/booster
heater. As soon as the tem-
perature is back within the
application limits, the heating
process is continued with the
compressor.
No action required.
Activate runtime-dependent
rapid heat-up if required. In-
creased energy expenditure
should be expected.
No action required. Activate
runtime-dependent rapid heat-
up if required.
No action required. The appli-
ance displays the "set temper-
ature adjustment" symbol and
blocks DHW heating until the
actual temperature captured
by the integral sensor is below
the temporary set value by a
value equal to the reduced start
hysteresis. DHW heating is then
re-enabled and the originally
selected set temperature is ap-
plied again.
Notify a qualified contractor if
water continues to drip when
heat-up has been completed.
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