Vaillant geoTHERM VWS Series Installation Instructions Manual page 58

8 Controller
Display shown
Auxiliary heater
Aux on during CH
Aux on during DHW
CH start at
>Values can be set
Cooling
Max Flow Setpoint.
>Select
Legionella protect
Parameters
Legionella protect
Legionella protect time
>Select
Table 8.4 Parameters that can be set in the Code level (cont.)
58
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 heat-
-600 °min
ing only, e.g. in emergency operation
Hot water operation
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 ena-
bled for post-heating in heating mode below this
temperature (can be set in Menu A3).
The menu is only displayed for hydraulics with cool-
C8
ing mode.
Flow temperature: Display of target flow tempera-
22 °C
ture The value can be changed.
Cooling mode is only possible when using the VWZ
NC 14/17 accessory, and only for VWS 14 and VWS 17
heat pumps.
Legionella protect: OFF/Mo/Tu/We/Th/Fr/Sa/Su
C9
Legionella protect time: The preset time of day de-
termines when the anti-Legionella function will start.
Off
04:00
The anti-Legionella function is carried out by the
auxiliary heating on the preset day of the week, at
the preset time, if the auxiliary heating has been ac-
tivated.
For this purpose, the controller sets the flow set-
point to 76 °C/74 °C (2K hysteresis). The anti-Le-
gionella 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
during this period).
Installation instructions geoTHERM VWS/VWW 0020057444_01
Factory setting
no CH
no CH
20°C
Off
04:00