Vaillant geoTHERM VWS Series Installation Instructions Manual page 62

8 Controller
Display shown
Installation assistant
Auxiliary heater
integration of the
Auxiliary heater
WW+HK
Out T. aux htr on
>Values can be set
Installation assistant
Geothermal settings
Freeze protect temp.
>Values can be set
Tool
Component Test 1
<HK2-P>
<ZP>
<ZH>
<SK2-P>
Table 8.4 Parameters that can be set in the Code level (cont.)
62
Description
Auxiliary heating: Determines whether, and where,
A3
the auxiliary heating is hydraulically connected:
- internal (electric auxiliary heating in the heat
pump)
- WW + HK: external auxiliary heating available for
hot water and the heating circuit
- 5 °C
- no auxiliary heating (no frost protection during
emergency operation)
- DHW: external auxiliary heating available only for
hot water
The controller will only activate the auxiliary heating
if it is enabled in Menu C7 "Auxiliary heating" and
the following condition is satisfied:
Out T. aux htr on: The auxiliary heating is only ena-
bled for post-heating in the heating mode if the out-
side temperature is below this value.
VWS only:
A4
Freeze protect temp.: Minimum permissible heat
source outlet temperature.
- 10 °C
If the temperature falls below this value, error mes-
sage 21/22 or 61/62 appears and the compressor
switches off.
VWW: Freeze protect temp. = 4 ºC.
You can check the heat pump actuators with the
A5
component test. This intervention lasts for a maxi-
mum of 20 minutes and ignores current controller
On
inputs during this time. Afterwards, the heat pump
Off
reverts to its previous operating condition.
Off
Note: If the compressor is activated, the CH pump
Off
and the brine pump or well pump will also be turned
on automatically.
UV1 = DHW: Changeover valve in "DHW loading" po-
sition.
UV1 = HK: Changeover valve in "CH mode" position.
Installation instructions geoTHERM VWS/VWW 0020057444_01
Factory setting
intern
- 5 °C
- 10 °C
Off