Settings; Connection Of An External Signal Transmitter; Display And Operating Controls; Symbol Description - STIEBEL ELTRON WWK 221 electronic Bedienung Und Installation

oPerATIoN

settings

3.7

Connection of an external signal transmitter

Note
This type of connection must only be carried out by a
qualified electrician.
External signal transmitters can be integrated via the built-in con-
tact input, e.g. a PV system to make use of solar power generated
on site.
The appliance has a second set temperature preselected at the
factory. This is activated when there is an external switching sig-
nal. Set temperature 2 is higher ranking than the standard set
temperature while there is an external switching signal. Following
a one-off activation (signal is present for at least 1 minute), set
temperature 2 applies for at least 20 minutes and is ranked higher
than set temperature 1.
You can change set temperature 2 on the appliance (see chapter
"Settings/Settings/Set temperature 2").
4. Settings
4.1

Display and operating controls

Note
15 seconds after every operation, the appliance auto-
matically reverts to the default display (amount of mixed
water) and saves the set value.
e l e c t r o n i c
5
4
1 Display
2 "Plus" button
3 "Minus" button
4 "Rapid heat-up" button
5 "Menu" button
48 | WWK 221-301 electronic
1
c o m f o r t
2
3
4.1.1 Symbols

symbol description

Mixed water volume: The currently available amount of mixed
water at 40 °C and at 15 °C cold water temperature is shown.
Set temperature adjustment: Subject to intake temperature and
hot gas temperature, the appliance may temporarily reduce the set
temperature to the actual value captured by the integral sensor.
The appliance displays the "set temperature 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-ena-
bled and the originally selected set temperature is applied again.
Actual temperature: The current actual temperature is shown. The
actual temperature indicates the temperature in the upper section
of the DHW cylinder and therefore largely corresponds to the outlet
temperature.
Set temperature
External signal transmitter: Set temperature 2 is the DHW tempera-
ture to which the appliance regulates if an external signal transmit-
ter is connected and active.
Standby: The symbol flashes if the appliance PCB and load (com-
pressor) are supplied with power separately. This connection
option is required if the appliance is to be operated via switchable
sockets in an energy management system, for example (see chap-
ter "Electrical connection").
Electric emergency/booster heater: This symbol indicates the pres-
ence of a demand on this component. This symbol being displayed
does not necessarily mean that the electric emergency/booster
heater is running.
Heat pump: This symbol indicates the presence of a demand on
this component. This symbol being displayed does not necessarily
mean that the compressor is running.
Defrost active
Service/fault: If the "service/fault" symbol appears on the display,
inform your qualified contractor. Continuous illumination of the
symbol indicates that the fault is not preventing appliance opera-
tion. A flashing "Service/fault" symbol indicates that water is not
being heated and it is essential you notify your qualified contractor.
Switching the appliance to emergency mode is a special case. The
electric emergency/booster heater will then heat the water despite
the flashing "Service/fault" symbol.
The "Electric emergency/booster heater" and "Heat pump" sym-
bols are displayed when there is a demand for these appliance
components. These symbols being displayed does not necessarily
mean that the electric emergency/booster heater and the heat
pump are running.
Example: The appliance is in rapid/comfort heat-up mode. The
electric emergency/booster heater switches off when the temper-
ature in the upper cylinder section has reached 65 °C. The heat
pump has not yet heated the lower section to 65 °C and the rapid/
comfort heat-up function has therefore not been terminated yet.
The "electric emergency/booster heater" symbol is displayed until
the rapid/comfort heating has terminated.
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