Appliance Operation Outside The Application Limits; Frost Protection (Air As Heat Source); Display And Control Elements - STIEBEL ELTRON WWS 20 Bedienung Und Installation

OPERATION
Appliance description
3.2 Appliance operation outside the application
limits
3.2.1 Ambient temperatures below the application limit
At temperatures below the lower application limit, hoar frost may
form on the evaporator depending on the air humidity and water
temperature.
Temperature sensor F3 captures and monitors the evaporator
temperature. If the evaporator temperature falls below 0 °C for
longer than 120 minutes, the evaporator will defrost. This defrost-
ing raises the evaporator temperature again.
Defrosting is registered as successful if the evaporator tempera-
ture rises to >6 °C within 20 minutes. If defrosting is unsuccessful,
two more attempts will be made. If these attempts are still unsuc-
cessful, the heat pump will be switched off and the error message
Er47 will appear on the display.
f To guarantee fault-free operation of the appliance, make sure f
you operate the appliance within its application limits (see
chapter "Specification / Data table").
Note
Heat-up times are longer while the evaporator is defrost-
ing.
3.2.2 Ambient temperatures above the application limit
The safety equipment switches the appliance off if the upper ap-
plication limit is exceeded. Following a cooling time of several
minutes the appliance is switched back on automatically. The ap-
pliance is switched off again if the intake air temperature rises
back above the permissible temperature value.
f To guarantee fault-free operation of the appliance, make sure f
you operate the appliance within its application limits (see
chapter "Specification / Data table").
3.3

Frost protection (air as heat source)

If the intake air temperature is too low, the error message Er57
will appear on the display.
If an immersion heater is installed in the DHW cylinder, it can
continue DHW heating while the fault remains. This requires heat
pump mode to be disabled.
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3.4

Display and control elements

The appliance is equipped with an integral digital controller. You
can use the controller display and control elements to call up and
set the appliance data.
3.4.1 Display
The display consists of a display and programming unit.
1 Display unit
2 Programming unit
Keys
Button Designation Description
Power button Put the appliance into standby mode or restart
it
Menu key Calling up the controller menu
MENU
Back button Return to the previous menu
Down button Scroll through the menu, adjust values,
display the set DHW value
Up button Scroll through the menu, adjust values,
display the optional temperature sensor in the
DHW cylinder (only when display sensor F2 is
connected)
OK button Save settings,
OK
select submenus,
acknowledge error messages
Symbols
Symbol Meaning bright
DHW heating DHW heating
active
Fan mode Fan mode active Fan mode
Compressor Compressor
active
Setting the Setting the tem-
temperature perature
Setting the Setting the time -
time
Electric heater Immersion
rod heater active
1
2
dimmed flashes
DHW heating ac- Pasteurisation
cording to time function active
program
-
switched off
Compressor Maintenance
switched off (every 2500
hours run)
- -
Time needs re-
setting
Immersion heat- -
er switched off
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