STIEBEL ELTRON LWZ 130 - Appliance Description and Initial Settings; Frost Protection Functionality; Passive Cooling Operation Mode; LWZ 130 Enthalpie Heat Exchanger

OPERATION
Appliance description
www.stiebel-eltron.com LWZ130 | 33
ENGLISH
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
that the air flow rates through the supply air and extract air fans
are achieved irrespective of the duct pressure.
Stage Display
Ventilation
for humid-
ity protec-
tion
0 "Power"
symbol and
digit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 ab-
sence of users and no drying of washing in
the residential unit.
Reduced
ventilation
1 "Fan" sym-
bol and
digit1
Reduced ventilation is the ventilation neces-
sary 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.
Standard
ventilation
2 "Fan" sym-
bol and
digit2
Standard ventilation is the ventilation neces-
sary to meet hygiene standards and ensure
protection of the building structure when
users are present.
Intensive
ventilation
3 “Fan”
symbol and
digit3
Intensive ventilation is increased ventilation
with a higher flow rate to reduce load peaks,
e.g. for rapid ventilation during or after a
party. You can switch on intensive ventila-
tion with the “intensive ventilation” button
or with an optionally connectible external
pushbutton.
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 Passive cooling
At high outside temperatures, temperatures in the building can
rise significantly above the set room temperature. With passive
cooling, the appliance offers a bypass function. With passive
cooling, the building can be supplied with cooler outdoor air by
bypassing the cross-countercurrent heat exchanger.
The appliance has no built-in bypass damper. The appliance
checks whether a window contact is connected and activated at
X18. See parameter P34.
You can use a parameter on the programming unit to define the
passive cooling operating mode. During passive cooling, only the
extract air fan is operated and the supply air fan is stopped.
In order for passive cooling to be active, open the window on
which the contact switch is installed. If the "passive cooling" sym-
bol appears, open the window. If the "passive cooling" symbol
goes off, close the window.
Passive cooling is normally used in summer when the outside
temperature is lower than the room temperature.
3.3 LWZ 130 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.
4. Settings
4.1 Switching the appliance on
The appliance has no ON/OFF switch. When the appliance is sup-
plied with power, it is in operation.
4.2 Programming unit
D0000040582
1
4
5
6
7
3
8
2
1 Upper display
2 Lower display
3 Touch-Wheel
4 "MENU" button
5 "HOME" button
6 "OK" button
7 "Intensive ventilation" button
8 "Intensive ventilation" indicator