Safety; Intended Use; General Safety Instructions; Test Mark - STIEBEL ELTRON LWZ 180 Bedienung Und 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.
The following are deemed inappropriate:
- 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 mark

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.
36 | LWZ 180 | LWZ 280 | LWZ 180 Enthalpie | LWZ 280 Enthalpie
The air flow rate is preset for each fan setting by the qualified con-
tractor during commissioning. Constant flow rate control ensures
that the air flow rates through the supply air and extract air fans
are achieved irrespective of the duct pressure.
operating Fan description
mode stage
Humidity prot. 0 Necessary ventilation for ensuring that the building
structure is protected under normal conditions
of use with somewhat reduced moisture loads,
e.g. during temporary absence of users and no dry-
ing of washing in the residential unit.
Stage 1 1 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 intermittent
user absence.
Stage 2 2 Standard ventilation is the ventilation necessary to
meet hygiene standards and ensure protection of the
building structure when users are present.
Intensive ven- 3 Intensive ventilation is increased ventilation with a
tilation 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 programming unit or
with an optionally connectible external pushbutton.
Time program 0 to 2 Time controlled fan program with various adjustable
mode fan settings.
LWZ 180 Enthalpie, LWZ 280 Enthalpie: 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 appears
on the display.
3.2

Bypass mode

The appliance has an integral bypass damper. The bypass damper
enables the supply of fresh air to bypass the heat exchanger.
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.
www.stiebel-eltron.com