Vaillant geoTHERM VWS Installation Instructions Manual page 59

Display shown
Auxiliary heater
Aux on during CH
Aux on during DHW
CH start at
>Settable values
Legionella protect
Parameters
Legionella protect
Legionella start
>Select
Table 8.4 Parameters that can be set in the Code level (cont.)
Installation instructions geoTHERM VWS 0020046310_01
Description
Aux on during CH
C7
no CH: CH blocked.
comfort CH enabled, dependent on Out T. aux htr on
no CH
and °mins lag/gain.
comfort
CH only: Heating mode by means of auxiliary hea-
-600°min
ting only, e.g. in emergency operation
Aux on during DHW
no CH: CH blocked
comfort Auxiliary heating supplies the temperature
level that the compressor cannot provide
(approx. > 58 °C cylinder temperature)
CH only: DHW heating by means of auxiliary heating
only, e.g. in emergency operation (if "no CH" was
previously activated, a max. DHW temp. of approx.
58 °C applies; if "CH" was activated, the max. DHW
temp set in C6 applies
CH start at: Setting the degree minutes until the
auxiliary heating starts, added to the degree minutes
for compressor start.
Example: -600°min plus -120°min
=> start at -720°min.
Out T. aux htr on: The auxiliary heating is only en-
abled for post-heating in heating mode below this
temperature (can be set in Menu A3).
Legionella protect: OFF/Mo/Tu/We/Th/Fr/Sa/Su
C9
Legionella start: The preset time of day determines
when the anti-legionella function will start.
Off
04:00
The anti-legionella function is carried out by the au-
xiliary heating on the preset day of the week, at the
preset time, if the auxiliary heating has been activa-
ted.
For this purpose, the controller sets the flow set-
point to 76 °C/74 °C (2K hysteresis). The anti-legio-
nella function is terminated when the current flow
temperature at the cylinder has reached 73 °C for a
duration of at least 30 min, or after 90 minutes if
73 °C is not reached (e.g., if hot water is drawn du-
ring this period).
Control system 8
Factory setting
no CH
no CH
Off
04:00
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