Frost Protection; Passive Cooling; Control Description - STIEBEL ELTRON LWZ 130 Bedienung Und Installation

OPERATION
Settings
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 0 "Power" Necessary ventilation for ensuring that the
for humid- symbol and building structure is protected under normal
ity protec- digit 0 conditions of use with somewhat reduced
tion moisture loads, e.g. during temporary ab-
sence of users and no drying of washing in
the residential unit.
Reduced 1 "Fan" sym- Reduced ventilation is the ventilation neces-
ventilation bol and sary to meet hygiene standards and ensure
digit 1 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 2 "Fan" sym- Standard ventilation is the ventilation neces-
ventilation bol and sary to meet hygiene standards and ensure
digit 2 protection of the building structure when
users are present.
Intensive 3 "Fan" Intensive ventilation is increased ventilation
ventilation symbol and with a higher flow rate to reduce load peaks,
digit 3 e.g. for rapid ventilation during or after a
party. You can switch on intensive ventilation
with the "intensive ventilation" button or with
an optionally connectible external switch.
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 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.
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.
32 | LWZ 130
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
1
2
3
4
5
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
4.2.1 Controls
Control Description
"MENU" Press this button for approx. one second to call up the menu
button from the standard display.
Within the menu, press this button to return to the beginning of
the menu. Parameter P1 is displayed.
When setting a parameter value, press this button to exit set-
ting of the parameter. Any changes made will not be saved.
"OK" button In order to set the parameter, you must first make it editable by
pressing the "OK" button. Then you can change the value with
the Touch-Wheel.
Once you have set the parameter, confirm your entry with the
"OK" button.
"HOME" Calls up the standard display
button
"Intensive Use this button to switch the appliance to intensive ventilation.
ventilation" You can set the runtime for intensive ventilation in parameter
button P2. Once this runtime has expired, the appliance returns to the
previously applicable fan stage.
Touch-Wheel From the home screen, you can use the Touch-Wheel to select
fan stages 0, 1 and 2, and activate the time programs. The
"time" symbol indicates that time programs are activated.
Use the Touch-Wheel to select a parameter or value in the
menu.
If you turn the Touch-Wheel quickly, the increment size changes
after a while.
Function block
Press the "HOME" and "OK" buttons simultaneously to activate the
function block. The "padlock" symbol appears. Then you can wipe
the programming unit clean without inadvertently changing any
settings. Press the "HOME" and "OK" buttons simultaneously for
two seconds to deactivate the function block.
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