Safety; Intended Use; General Safety Instructions; Test Symbols - Stiebel Eltron VRC-W 400 Utilisation Et Installation

OpERaTiON

Safety

2. Safety
2.1

Intended use

The appliance is designed as a mechanical ventilation unit with
central supply and extract air routing.
The appliance is intended for domestic use. It can be used safely
by untrained persons.
The appliance can also be used in non-domestic environments,
e.g. in small businesses, as long as it is used in the same way. Any
other use beyond that described shall be deemed inappropriate.
Observation of these instructions and of the instructions for any
accessories used is also part of the correct use of this appliance.
It is deemed inappropriate to:
- Use extract air containing grease, explosive gases, dust or
adhesive aerosols
- Connect cooker hoods or vented tumble dryers to the ventila-
tion system
Never adjust the settings of supply and extract air vents inside the
rooms. These have been set up by a qualified contractor during
commissioning.
2.2

General safety instructions

WARNING Injury
!
The appliance may be used by children over 8 years of
age and persons with reduced physical, sensory or men-
tal capabilities or a lack of experience and expertise,
provided that they are supervised or they have been
instructed on how to use the appliance safely and have
understood the potential risks. Children must never play
with the appliance. Cleaning and user maintenance must
not be carried out by children without supervision.
WARNING Injury
The discharged cold air can cause condensation to be
formed in the vicinity of the air discharge.
f Ensure that no risk of slipping due to wet conditions
or ice formation occurs on adjacent footpaths and
driveways at low temperatures.
2.3

Test symbols

See type plate on the appliance.
3.

Appliance description

The appliance draws in outdoor air with a fan. A second fan ex-
tracts stale air from the rooms containing odours or moisture,
e.g. kitchen, bathroom, WC. Extract air and outdoor air are routed
through separate air ducts. Extract air and outdoor air are filtered
by separate filters.
The extract air and outdoor air flow through a cross-countercur-
rent heat exchanger. The outdoor air absorbs heat taken from the
extract air. This enables a large proportion of thermal energy to
be recovered.
The air flow rate is preset for each fan stage by the qualified con-
tractor during commissioning. Constant flow rate control ensures
4 | VRC-W 400 (E)
that the air flow rates through the supply air and extract air fans
are achieved irrespective of the duct pressure.
Stage Display
Ventilation 0 "Power"
for humidity symbol and
protection digit 0
Reduced 1 "Fan" symbol
ventilation and digit 1
Standard 2 "Fan" symbol
ventilation and digit 2
Intensive 3 "Fan" sym-
ventilation bol and
digit 3
VRC-W 400 E : Enthalpy heat exchanger
The enthalpy heat exchanger is a highly efficient, moisture-trans-
ferring countercurrent heat exchanger with a selective membrane.
The membrane helps to recover moisture from the extract air and
transfer it to the supply air. This prevents the relative humidity
in the rooms from dropping too low during the winter months.
3.1

Frost protection

The appliance has a frost protection controller, which ensures that
it works to optimum effect even at low outside temperatures. If the
outdoor air temperature falls below the selected frost protection
value, the electric preheating coil is switched on. This prevents the
cross-countercurrent heat exchanger from freezing up. When the
preheating coil is active, the "frost protection" symbol illuminates
on the display.
3.2

Bypass function

The appliance has an integral bypass damper. The bypass damper
enables the supply of fresh air which does not flow through the
heat exchanger. You can specify the operating mode of the bypass
damper with one parameter on the programming unit (see chapter
"Settings / Parameters").
Utilising cool outdoor air
Cool, fresh air is required on summer nights in particular. In such
cases, in automatic mode, as much of the warm air in the home
as possible is displaced by cooler fresh air.
Utilising warm outdoor air
In spring and autumn, the appliance can increase the room tem-
perature by opening the bypass damper in automatic mode and
drawing warmer outdoor air into the building.
Necessary ventilation for ensuring that
the building structure is protected under
normal conditions of use with somewhat
reduced moisture loads, e.g. during tem-
porary absence of users and no drying of
washing in the residential unit.
Reduced ventilation is the ventilation
necessary to meet hygiene standards and
ensure protection of the building structure
(moisture level) under standard conditions
of use with partially reduced moisture and
pollutant loads, e.g. as a result of intermit-
tent user absence.
Standard ventilation is the ventilation
necessary to meet hygiene standards and
ensure protection of the building structure
when users are present.
Intensive ventilation is increased ventila-
tion with a higher flow rate to reduce load
peaks, e.g. for rapid ventilation during or
after a party. You can switch on intensive
ventilation with the "intensive ventilation"
button. Alternatively, you can switch on the
intensive ventilation with an optional ex-
ternally connected switch or button.
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