STIEBEL ELTRON VRC-W 400 - Page 22

INSTALLATION
Settings
22 | VRC-W 400 (E) www.stiebel-eltron.com
 Heat recovery bypass
 Window contact mode (depending on unit)
Setting whether the window contact is relevant for the bypass
mode.
Parameter Effect
Without window
contact
The supply air fan is stopped independently of the win-
dow contact.
With window con-
tact
The window contact is used to determine whether the
appliance stops the supply air fan.
 Temperature to enable heat recovery bypass
To enable checking of the other parameters for bypass mode, the
outdoor air temperature must be no less than the value set in
this parameter.
 Temperature to block heat recovery bypass
If the outdoor air temperature falls below this blocking tempera-
ture, bypass mode is disabled.
 Hysteresis for heat recovery bypass
To make cooling possible, the outdoor air temperature must be
cooler than the extract air temperature by the value set in this
parameter.
 Temp. differential for heat recovery bypass
Use this parameter to define the temperature differential that must
be exceeded for bypass mode to be enabled. For bypass mode to
be enabled, the following condition must be met for 60minutes:
If Operating mode heat recovery bypass: Outdoor air routing au-
tomatic
- Set room temperature+ Temp. differential for heat recovery
bypass< Outdoor air temp.
If Operating mode heat recovery bypass: Extract air routing autom.
- Set room temperature+ Temp. differential for heat recovery
bypass< Extract air temp.
 Frost protection
 Temperature for enabling frost protection
The unit only activates frost protection if the outdoor air temper-
ature drops to the value that can be set in this parameter.
 Enable preheating
Parameter Effect
Off The internal preheater is completely deactivated.
On The internal preheater is activated. To keep the heat ex-
changer free from ice, preheating ensures a minimum
supply air temperature with reference to the temperature,
which can be set in the "Frost protection temp." parameter.
While this parameter is being displayed or adjusted, the "frost
protection" symbol is shown on the display.
 Frost protection mode
Parameter Effect
Outdoor air reg. At this setting, the appliance operates solely in frost protec-
tion mode. The preheating coil control only measures the
outside temperature.
Supply air reg. At this setting, the appliance operates in comfort mode. In
addition to the outside temperature, the supply air tempera-
ture is also measured.
Passive house
reg.
The preheating coil is controlled to ensure that the supply
air temperature does not fall below the 16.5°C specified in
the passive house criteria.
 Condensate prevention
 Enable condensate prevention
The Condensate prevention function is intended for units without
an enthalpy heat exchanger in areas with a subtropical climate.
If the unit is in ventilation mode, and this parameter has the value
"On", the unit checks the following conditions:
- Outdoor air temp.> Extract air temp.
- Extract air temp.+ Offset condensate prevention< Outdoor
air dew point
If both conditions are met, the unit switches the fans off. After
a shutdown, the unit switches on the fans cyclically and checks
whether the conditions are still valid or whether ventilation mode
can be resumed.
Interval between measurements min 60
Duration of measurement min 5
 Offset condensate prevention
This parameter changes the shutdown point for Condensate pre-
vention. This allows the fans to be switched off 2K before the dew
point temperature is reached, for example.
 Ventilation unit
 Device type
This parameter is set at the factory. The parameter can only be set
after the controller assembly has been replaced.
344462-45598-9853_VRC-W_400_E_en_fr_it_nl.indb 22344462-45598-9853_VRC-W_400_E_en_fr_it_nl.indb 22 07.07.2023 17:00:1907.07.2023 17:00:19