STIEBEL ELTRON LWZ 130 User manual

BEDIENUNG UND INSTALLATION
OPERATION AND INSTALLATION
OBSLUHA A INSTALACE
Zentrales Lüftungsgerät mit Wärmerückgewinnung | Centralised ventilation unit with
heat recovery | Centrální větrací přístroj s rekuperací tepla
» LWZ130
» LWZ130Enthalpie

30 | LWZ130 www.stiebel-eltron.com
CoNTeNTs
SPECIAL INFORMATION
OPERATION
1. General information ��������������������������������������� 31
1.1 Safety instructions���������������������������������������������� 31
1.2 Other symbols in this documentation ���������������������� 31
1.3 Information on the appliance �������������������������������� 32
1.4 Standardised output data ������������������������������������� 32
1.5 Units of measurement ����������������������������������������� 32
2. Safety�������������������������������������������������������� 32
2.1 Intended use����������������������������������������������������� 32
2.2 General safety instructions ����������������������������������� 32
2.3 Test symbols ����������������������������������������������������� 32
3. Appliance description ������������������������������������� 33
3.1 Frost protection ������������������������������������������������� 33
3.2 Passive cooling �������������������������������������������������� 33
3.3 LWZ 130 Enthalpie: Enthalpy heat exchanger������������� 33
4. Settings ����������������������������������������������������� 33
4.1 Switching the appliance on����������������������������������� 33
4.2 Programming unit ���������������������������������������������� 33
4.3 Selecting the fan stage ����������������������������������������34
4.4 Activating time programs ������������������������������������� 34
4.5 Menu �������������������������������������������������������������� 34
 P1: Set room temperature ������������������������������������ 35
 P3: Passive cooling operating mode ������������������������ 35
 P4: Reset filter��������������������������������������������������� 35
 P28: Enable fan�������������������������������������������������� 35
 P80: Day ���������������������������������������������������������� 35
 P83: Mode of backlighting ������������������������������������36
 P84: Illumination duration ������������������������������������ 36
 P85: Lower standard display ��������������������������������� 36
 Pro ����������������������������������������������������������������� 36
 Cod����������������������������������������������������������������� 37
4.6 Switching off the appliance����������������������������������� 37
5. Maintenance, cleaning and care�������������������������� 37
5.1 Replacement filters��������������������������������������������� 37
5.2 Filter inspection and replacement �������������������������� 37
6. Troubleshooting �������������������������������������������� 38
INSTALLATION
7. Safety�������������������������������������������������������� 39
7.1 General safety instructions ����������������������������������� 39
7.2 Instructions, standards and regulations ������������������� 39
7.3 Operation of the appliance in buildings with
combustion equipment ���������������������������������������� 39
8. Appliance description ������������������������������������� 40
8.1 Standard delivery�����������������������������������������������40
8.2 Accessories������������������������������������������������������� 40
9. Preparation ������������������������������������������������� 40
9.1 Storage������������������������������������������������������������40
9.2 Installation site��������������������������������������������������40
9.3 Transport ��������������������������������������������������������� 41
10. Installation�������������������������������������������������� 41
10.1 Mounting the appliance ��������������������������������������� 41
10.2 Connecting the condensate drain hose��������������������� 41
10.3 Air ducts ���������������������������������������������������������� 42
10.4 Electrical connection�������������������������������������������44
10.5 Overflow apertures��������������������������������������������� 45
11. Commissioning ��������������������������������������������� 45
11.1 Initial start-up��������������������������������������������������� 45
11.2 Recommissioning����������������������������������������������� 45
12. Settings ����������������������������������������������������� 46
12.1 Parameter ��������������������������������������������������������46
 P14: Supply air flow rate offset ������������������������������ 47
 P15: Humidity protection interval ��������������������������� 47
 P16: Start-up time for humidity measurement ����������� 47
 P22: Enable preheater ����������������������������������������� 47
 P24: Passive cooling release temperature ����������������� 47
 P25: Passive cooling blocking temperature ��������������� 47
 P26: Passive cooling hysteresis ������������������������������ 47
 P27: Temperature differential for enabling passive
cooling ������������������������������������������������������������ 47
 P29: Appliance type �������������������������������������������� 47
 P30: Temperature for enabling frost protection ���������� 47
 P31: Enabling of humidity-dependent flow rate control 47
 P32: Enable outdoor air condensate prevention���������� 47
 P33: Temperature offset for condensate prevention����� 47
 P34: Window contact operating mode ���������������������48
 P35: Bypass function cooling/heating ����������������������48
 P70: Delete fault list ��������������������������������������������48
12.2 Actual values ����������������������������������������������������48
12.3 Code ���������������������������������������������������������������48
 Cod�����������������������������������������������������������������48
13. Appliance shutdown ��������������������������������������� 48
14. Maintenance ������������������������������������������������ 48
15. Troubleshooting �������������������������������������������� 50
16. Disposal ����������������������������������������������������� 50
17. Specification ������������������������������������������������ 51
17.1 Dimensions and connections��������������������������������� 51
17.2 Fan diagram ����������������������������������������������������� 52
17.3 Wiring diagram ������������������������������������������������� 53
17.4 Data table ��������������������������������������������������������54
GUARANTEE
ENVIRONMENT AND RECYCLING
FILTER INSPECTION LOG

www.stiebel-eltron.com LWZ130 | 31
ENGLISH
SPECIAL INFORMATION | OPERATION
General information
SPECIAL INFORMATION
- The appliance may be used by children over 8
years of age and persons with reduced physical,
sensory or mental capabilities or a lack of ex-
perience 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.
- Observe all applicable national and regional reg-
ulations and instructions.
- The appliance is not approved for outdoor
installation.
- You must not install the appliance in safety zones
0, 1 and 2. The safety zones are defined in the
IEC60364-7-701 standard.
- Maintain the minimum clearances. See chapter
"Preparations/ Installation site".
- Fix the appliance in position as described in
chapter "Installation/ Preparations".
- The connection to the power supply must be in
the form of a permanent connection. Ensure the
appliance can be separated from the power sup-
ply by an isolator that disconnects all poles with
at least 3mm contact separation. This require-
ment can be met by contactors, isolators, fuses,
etc.
- Observe the fuse protection required for the ap-
pliance (see chapter "Specification/ Data table").
- For the power cable, connections and connecting
cables to external control equipment, see chapter
"Electrical connection" and the wiring diagram in
chapter "Specification".
OPERATION
1. General information
The chapters "Special information" and "Operation" are intended
for both users and qualified contractors. The chapter "Installation"
is intended for qualified contractors.
Note Read these instructions carefully before using the appli-
ance and retain them for future reference. Pass on the
instructions to a new user if required.
1.1 Safety instructions
1.1.1 Structure of safety instructions
!KEYWORD Type of risk
Here, possible consequences are listed that may result
from failure to observe the safety instructions.
f Steps to prevent the risk are listed.
1.1.2 Symbols, type of risk
Symbol Type of risk
Injury
Electrocution
Burns
(burns, scalding)
1.1.3 Keywords
KeYword Meaning
DANGER Failure to observe this information will result in serious
injury or death.
WARNING Failure to observe this information may result in serious
injury or death.
CAUTION Failure to observe this information may result in non-seri-
ous or minor injury.
1.2 Other symbols in this documentation
Note General information is identified by the adjacent symbol.
f Read these texts carefully.
Symbol Meaning
Material losses
(appliance damage, consequential losses and environmen-
tal pollution)
Appliance disposal
!
!

OPERATION
Safety
32 | LWZ130 www.stiebel-eltron.com
f This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
1.3 Information on the appliance
Symbol Meaning
Outdoor air
Exhaust air
Extract air
Supply air
Filters
Electric preheating coil
Cross-countercurrent heat exchanger
Fan
1.4 Standardised output data
Information on determining and interpreting the specified stand-
ardised output data
Standard: EN 13141-7
The output data specifically mentioned in text, diagrams and
technical datasheets has been determined in line with the test
conditions described in the standard shown in the heading of
this chapter.
Generally, these standardised test conditions will not fully meet
the conditions found at the installation site of the system user.
Depending on the chosen test method and the extent to which
the selected method deviates from the conditions described in
the standard shown in the heading of this chapter, any deviations
can have a considerable impact. Additional factors that have an
influence on the test values are the measuring equipment, the
system configuration, the age of the system and the flow rates.
A confirmation of the specified output data can only be obtained
if the conditions applicable to the relevant test match those of the
standard shown in the heading of this chapter.
1.5 Units of measurement
Note All measurements are given in mm unless stated oth-
erwise.
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-do-
mestic 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 inappro-
priate. 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.

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

OPERATION
Settings
34 | LWZ130 www.stiebel-eltron.com
4.2.1 Controls
Control Description
"MENU"
button
Press this button for approx. one second to call up the menu
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"
button
Calls up the standard display
"Intensive
ventilation"
button
Use this button to switch the appliance to intensive ventilation.
You can set the runtime for intensive ventilation in parameter
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.
4.2.2 Display
If no user action occurs within the time selected in the illumi-
nation duration parameter, the display backlighting switches off
and the standard display appears. Press any button to switch the
background lighting on again.
Symbol Description
Power: This symbol indicates that the appliance is switched on and
the fans are operating in "humidity protection" mode.
Time: This symbol indicates that the appliance is operating in time
program mode. Depending on the program, the appliance is oper-
ated at different fan stages.
Fan: This symbol, with the associated digit, indicates the fan stage
at which the appliance is currently running. If the unit has switched
off the fans to prevent condensate, the “Fan” symbol flashes.
Passive cooling: If the conditions for passive cooling are met, the
symbol illuminates. This does not signify that passive cooling is
already active. The symbol prompts you to open the window. If the
symbol goes out, you can close the window again.
This symbol is displayed when the function block is activated. Press
the "HOME" and "OK" buttons simultaneously for two seconds to
deactivate the function block.
Filters: Change the filter when this symbol appears.
Frost protection: This symbol is displayed when the appliance has
turned on the preheating coil for frost protection.
Service/fault: The "service/fault" symbol illuminates permanently
in the event of faults that do not impair the basic function of the
appliance. The "service/fault" symbol flashes if a serious fault has
occurred. Call your qualified contractor.
4.3 Selecting the fan stage
From the home screen, you can use the Touch-Wheel to select fan
stages 0, 1 and 2. The set value is accepted without you having to
press a button to confirm it.
You cannot activate intensive ventilation with the Touch-Wheel.
To switch on intensive ventilation, press the "intensive ventila-
tion" button for approx. one second. When intensive ventilation
is activated, the "intensive ventilation" indicator illuminates. You
can switch on intensive ventilation with the “intensive ventilation”
button or with an optionally connectible external pushbutton. You
can only deactivate intensive ventilation with the "intensive ven-
tilation" button.
If you set fan stage 0, the appliance switches to a 24 hour dormant
phase. The humidity protection control unit only starts after this.
The qualified contractor can configure the humidity protection
control unit with parameters.
4.4 Activating time programs
The "time" symbol indicates that time programs are activated.
If the time programs are not activated, turn the Touch-Wheel
clockwise to switch from the home screen. After fan stage2, the
fan stage set in the time program appears along with the "time"
symbol.
Note If you switch the appliance to time program operation,
time programs must be entered in the "prog" menu. Oth-
erwise the appliance continues to run without a time limit
in set fan stage 2.
Enter the time program settings in the menu.
At times where there is no time program defined, the appliance
runs in set fan stage 2.
4.5 Menu
Display Description
P1 - Pxx Parameter
I1 - Ixx Actual values
Pro Programs
Cod Entry of the code for unlocking protected parameters and actual
values
f To access the parameters, press the "MENU" button.
The "HOME" button takes you to the standard display. If you have
not changed any settings for a while, the appliance automatically
switches back to the standard display.

OPERATION
Settings
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ENGLISH
4.5.1 Parameter
Description Unit Min. Max. Options
P1 Set room temperature °C 528
P2 This parameter defines the
runtime for intensive ven-
tilation. After this time has
expired, the appliance returns
to the previously applicable
fan stage.
min 1 240
P3 Passive cooling operating
mode
0| 1| 2 | 3
P4 Reset filter 1 | 0
P28 Enable fan On| OFF
P80 Day 1 - 7
P81 Time 00:00 23:59
P82 Level of lighting 2 10
P83 Mode of backlighting Auto | On| OFF
P84 Illumination duration s 1 500
P85 Lower standard display OFF | Time| Set room
temperature| Extract
air temp.| Extract air
humidity
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. If you do not press the "OK" button to make the
parameter editable, activating the Touch-Wheel causes the next
parameter to be displayed.
Press the "OK" button to save the set value for a parameter. If you
do not confirm the parameter change with the "OK" button, your
change will be lost.
P1: Set room temperature
Set an outside temperature, above which passive cooling should
ensure that outdoor air bypasses the heat exchanger and flows
directly into the building. During passive cooling, only the extract
air fan is operated and the supply air fan is stopped.
P3: Passive cooling operating mode
Effect
0 Passive cooling is permanently disabled. Air flows through the heat ex-
changer.
1 Passive cooling is enabled.
2 Passive cooling operates with summer day detection. This option is set in
the delivered condition.
3 Passive cooling operates subject to the extract air temperature.
The appliance checks whether a window contact is connected and
activated at X18. See parameter P34.
Note The qualified contractor can set the parameters men-
tioned in the description of this parameter.
P24: Passive cooling release temperature
P25: Passive cooling blocking temperature
P26: Passive cooling hysteresis
P27: Temperature differential for enabling passive cooling
P3 = 2: Passive cooling with summer day detection
In order for passive cooling to be enabled, the following condition
must apply for 60minutes: Outdoor air temperature > Set room
temperature + P27
If all of the following conditions are met, passive cooling switches
the appliance to extract air mode.
- Outdoor air temperature < Extract air temp. - P26
- Extract air temp. > Set room temperature
If one of the following conditions is met, passive cooling termi-
nates extract air mode.
- Outdoor air temperature < P25
- Outdoor air temperature > Extract air temp. - P26
- Extract air temp. < Set room temperature
P3 = 3: Passive cooling subject to extract air temperature
In order for passive cooling to be enabled, the following condition
must apply for 60minutes: Extract air temp. > Set room temper-
ature + P27
This delayed activation is intended to prevent cooling down in
spring and autumn.
If all of the following conditions are met, passive cooling switches
the appliance to extract air mode.
- Outdoor air temperature < Extract air temp. - P26
- Extract air temp. > Set room temperature
If one of the following conditions is met, passive cooling termi-
nates extract air mode.
- Outdoor air temperature < P25
- Outdoor air temperature > Extract air temp. - P26
- Extract air temp. < Set room temperature
P4: Reset filter
f Set this parameter to 1 after changing the filters.
The appliance resets the filter runtime to 0. This parameter is
automatically reset to 0.
P28: Enable fan
You can switch off the fans at any time via the programming unit
menu, e.g. to deactivate ventilation if there is a fire.
Effect
OFF The fans are deactivated. "OFF" and the fan icon flash on the display.
On The fans are enabled.
P80: Day
1Monday
2Tuesday
3Wednesday
4Thursday
5Friday
6Saturday
7Sunday

OPERATION
Settings
36 | LWZ130 www.stiebel-eltron.com
P83: Mode of backlighting
Effect
On Backlighting switched on
OFF Backlighting switched off
Auto If no user action occurs within the time selected in the illumination du-
ration parameter, the display backlighting switches off and the standard
display appears.
P84: Illumination duration
If no user action occurs within the time selected in the illumination
duration parameter, the display backlighting switches off and the
standard display appears.
P85: Lower standard display
Use this parameter to define what is displayed in the lower section
of the standard display. If the appliance detects a fault, the fault is
indicated in the lower section of the standard display.
4.5.2 Actual values
Description Unit
I1 Passive cooling status
I2 Extract air temperature °C
I3 Relative humidity of extract air %
I4 Filter service life h
I5 Appliance software version
I6 Unit software patch
I7 Terminal device serial number
I8 Programming unit software version
I70-79 Fault memory
Faults detected by the appliance are stored in actual values I70
to I79.
The latest fault is stored in I70; the oldest in I79. If no faults are
entered, dashes are shown. The latest fault is also shown in the
lower section of the standard display. Possible faults are listed for
qualified contractors in the "Troubleshooting" chapter.
4.5.3 Programs
Pro
The appliance offers the option to set 21 time programs. Switch
between the time programs using the Touch-Wheel. Press the "OK"
button to switch to setting a time program.
Time pro-
gram x
x.1 x.2 x.3 x.4
Day or group of
days
Fan stage Start time Stop time
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
Time pro-
gram x
x.1 x.2 x.3 x.4
Day or group of
days
Fan stage Start time Stop time
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
Setting a time program begins with selecting a day of the week or
a group of days. Press "OK". Set the day using the Touch-Wheel.
Confirm with the "OK" button.
Use the Touch-Wheel to switch to setting the fan stage. Press
"OK". Set the fan stage in which the appliance runs when the
time program takes effect using the Touch-Wheel. Confirm with
the "OK" button.
Note You cannot switch on fan stage3 with time programs.
Use the Touch-Wheel to switch to setting the start time. Press
"OK". Set the start time of the respective time program using the
Touch-Wheel. Confirm with the "OK" button.
Use the Touch-Wheel to switch to setting the stop time. Press
"OK". Set the stop time of the respective time program using the
Touch-Wheel. Confirm with the "OK" button.
To delete a time program, go to the menu item where the day or
group of days is selected for the respective time program. Turn the
Touch-Wheel anti-clockwise until the day disappears and dashes
appear in the lower section of the display.
Note In the case of overlapping time programs, the program
with the highest number takes priority.
Note At times where there is no time program defined, the
appliance runs in set fan stage 2.
Example
Time scale Stage
Monday - Friday 06:00 - 22:00 2
22:00 - 06:00 1
Saturday, Sunday 07:00 - 23:00 2
23:00 - 07:00 1
xx.1 x.2 x.3 x.4
Day or group of
days
Fan stage Start
time
Stop time
 11/2/3/4/5 1 22:00 00:00
 21/2/3/4/5 1 00:00 06:00
 36/7 1 23:00 00:00
 46/7 1 00:00 07:00

OPERATION
Maintenance, cleaning and care
www.stiebel-eltron.com LWZ130 | 37
ENGLISH
4.5.4 Code
Cod
You can use this menu item to enable actual values and parame-
ters, which are reserved for qualified contractors.
Options Effect
A0 The only parameters displayed are those that have been released
for the appliance user and can therefore be accessed without a
code.
A1 Parameters for qualified contractors
A2 Parameters for service department
A1 or A2 is shown on the display when you enter the correct
four-digit code.
If you switch to the actual values or parameters, you see the en-
abled parameters.
Note After entering the code, switch to the menu by pressing
the "MENU" button. If you first switch to the standard
display by pressing the "HOME" button, the parameter
block is reactivated.
4.6 Switching off the appliance
!Material losses
If you interrupt the power supply to the appliance, check
that humidity protection is ensured for the building.
The appliance has no ON/OFF switch. Disconnect the power supply
at the fuse/MCB in the domestic distribution board.
5. Maintenance, cleaning and care
Maintenance by the user is limited to filter inspection and replace-
ment required at certain intervals.
5.1 Replacement filters
Part
number
Product name Description Classification in
accordance with
ISO16890
Quan-
tity
238923 FMS G4-10 130/135 Coarse particle
filter mat
ISO Coarse > 60 % (G4) 10
238924 FMK M5-2 130/135 Fine filter ePM10 ≥ 50 % (M5) 2
238925 FMK F7-2 130/135 Fine filter ePM1≥ 50% (F7) 2
5.2 Filter inspection and replacement
!Material losses
Never operate the appliance without filters.
!Material losses
Operate the appliance with at least the recommended
filter class. Ensure that filters are fitted precisely so that
they can fulfil their function.
f Inspect the filters for the first time three months after com-
missioning the appliance.
When the total fan runtimes reach the “Filter change interval”
value, which can be set by the qualified contractor, the program-
ming unit displays the “Filter” symbol.
The qualified contractor can lengthen or shorten the interval for
inspecting filters depending on the level of contamination.
If the "filter" symbol illuminates, check the filters.
Change the filters if the surface is covered completely in dirt or
the filter is discoloured throughout.
Change the filters at least every 12 months.
Filter inspection
f Disconnect the appliance from the power supply.
D0000068468
2
3
1
3
4
56
1 Wing screw
2 Filter cassette, extract air filter
3 Filter mat
4 Grille
5 Filter cassette, outdoor air filter
6 Outdoor air filter
f Undo the wing screw on the filter cassette of the extract air
filter by turning the screw anti-clockwise.
f Remove the filter cassette from the appliance.
1.
2. 3.
D0000068462
f If necessary, place a new filter in the filter cassette. To do
this, slide the grille – behind which the filter mat is located –
a little to one side and swing the grille forwards like a door.
!Material losses
Operate the appliance with at least the recommended
filter class. Ensure that filters are fitted precisely so that
they can fulfil their function.
f Ensure that the direction of air flow through the filter is
correct.
M5, F7: The direction of flow is indicated by an arrow on the side
of the filter.

OPERATION
Troubleshooting
38 | LWZ130 www.stiebel-eltron.com
Coarse particle filter mat (White, G4): This filter does not have a
preferred direction of flow.
f After inserting the filter, flip the grille shut again.
f Push the filter cassette into the appliance. Ensure that the
filter cassette is installed in the intended position. The arrow
on the filter cassette and the arrow on the appliance must
point in the same direction.
f To secure the filter cassette, turn the wing screw clockwise.
f Undo the wing screw on the filter cassette of the outdoor air
filter by turning the screw anti-clockwise.
f Remove the filter cassette from the appliance.
f If necessary, place a new filter in the filter cassette.
f Push the filter cassette into the appliance. Ensure that the
filter cassette is installed in the intended position. The arrow
on the filter cassette and the arrow on the appliance must
point in the same direction.
f To secure the filter cassette, turn the wing screw clockwise.
f Make a note of the filter change date.
Note f Log the filter inspection in the appendix of this man-
ual.
f Switch on the power supply to the appliance.
f Order new filters in good time or purchase a filter
subscription.
Note If other filters are installed in the system, e.g. filters in the
extract air vents or a filter box, also perform the inspec-
tion there and change the filter(s) if necessary.
6. Troubleshooting
Faults detected by the appliance are stored in actual values I70 to
I79. The latest fault is always stored in l70. The latest fault is also
shown in the lower section of the standard display.
If you cannot remedy the fault, contact your qualified contractor.
To facilitate and speed up your request, provide the number from
the type plate (000000-0000-000000). The type plate is located on
the control panel on the side of the appliance.

INsTALLATIoN
Safety
www.stiebel-eltron.com LWZ130 | 39
ENGLISH
INsTALLATIoN
7. Safety
Only a qualified contractor should carry out installation, commis-
sioning, maintenance and repair of the appliance.
7.1 General safety instructions
We guarantee trouble-free function and operational reliability only
if original accessories and spare parts intended for the appliance
are used.
7.2 Instructions, standards and regulations
WARNING Burns In connection with the fire prevention regulations con-
cerning the installation of ventilation systems, observe
all country-specific regulations and requirements. In
Germany, these are particularly the building regulation
guideline on fire prevention requirements of ventilation
systems in its applicable version.
Note Observe all applicable national and regional regulations
and instructions.
7.3 Operation of the appliance in buildings with
combustion equipment
The term "combustion equipment" used below includes, for exam-
ple, tiled stoves, fireplaces and equipment with gas combustion.
!WARNING INJURY
Ventilation units can generate negative pressure in the
dwelling. If combustion equipment is operating at the
same time, combustion exhaust gases can penetrate the
room where the combustion equipment is installed. It is
therefore important to observe a number of points for
simultaneous operation of a ventilation unit and com-
bustion equipment.
The engineering, installation and operation of the ventilation unit
and combustion equipment must be carried out in accordance with
national and regional regulations.
7.3.1 Planning safety measures
Together with the relevant authorities, engineers plan the safety
measures that are required for simultaneous operation of a ven-
tilation unit and combustion equipment.
Alternate operation
Alternate operation means that, when the combustion equipment
is started, the mechanical ventilation system is switched off and/
or cannot be started. Alternate operation must be ensured by
appropriate measures, e.g. automatically enforced shutdown of
the ventilation unit.
Simultaneous operation
For simultaneous operation of combustion equipment and a me-
chanical ventilation system, we recommend choosing approved
room sealed combustion equipment (in Germany, with DIBt ap-
proval).
If open flue combustion equipment is operated in the dwelling
at the same time as a ventilation unit, combustion exhaust gases
must be prevented from penetrating the home as a result of pos-
sible negative pressure in the room.
The ventilation unit may only be operated in combination with
intrinsically safe combustion equipment. This combustion equip-
ment has, for example, a draught hood or an exhaust gas monitor
and is permitted to be operated in conjunction with ventilation
units. Alternatively, external, tested safety equipment can be con-
nected to monitor the operation of the combustion equipment.
For example, you can install differential pressure monitoring to
monitor the chimney draught and to switch off the ventilation unit
in the event of a fault.
The equipment for differential pressure monitoring must fulfil the
following requirements:
- Monitoring of the differential pressure between the connec-
tion piece to the chimney and the room where the combus-
tion equipment is installed
- Possibility of matching the shutdown value for the differential
pressure to the minimum draught requirement for the com-
bustion equipment
- Floating contact to switch off ventilation
- Optional connection of a temperature capturing device so
that differential pressure monitoring is only enabled when
the combustion equipment is in operation and so that un-
wanted shutdowns due to environmental influences can be
avoided
Note Differential pressure switches that use the pressure
differential between the outdoor air pressure and the
pressure in the room where the combustion equipment
is sited as a response criterion are not suitable.
Note We recommend installing and regularly maintaining a
carbon monoxide detector in accordance with EN50291
for operation of any combustion equipment.
7.3.2 Commissioning
When commissioning the ventilation unit, it is important to check
and document in the commissioning log that combustion exhaust
gases are not penetrating the dwelling in a quantity that is harmful
to health.
Commissioning in Germany
Acceptance is carried out by the local flue gas inspector.
Commissioning outside Germany
Acceptance must be carried out by a specialist. In case of doubt,
you must involve an independent expert in the acceptance pro-
cedure.

INsTALLATIoN
Appliance description
40 | LWZ130 www.stiebel-eltron.com
7.3.3 Maintenance
Regular maintenance of the combustion equipment is prescribed.
Maintenance includes checking the exhaust gas extraction system,
the free pipe cross-sections and the safety equipment. The rele-
vant qualified contractor responsible must prove that there is a
sufficient flow of combustion air.
8. Appliance description
8.1 Standard delivery
The following are delivered with the appliance:
- Hardwired programming unit for wall mounting on finished
walls, with adaptor cable
- Anti-vibration mounts
- Plug and strain relief casing for the programming unit and
the external floating contacts and switches (intensive ventila-
tion, window contact)
8.2 Accessories
- DN150 air duct connectors
You can obtain ventilation pipes, extract air and supply air vents
and similar accessories from us.
LWZ130
- Condensate pump with mounting enclosure
9. Preparation
9.1 Storage
!Material losses
Never store the appliance in dusty places.
9.2 Installation site
WARNING Electrocution You must not install the appliance in safety zones 0, 1
and 2. The safety zones are defined in the IEC60364-7-
701 standard.
!Material losses
The appliance is not approved for outdoor installation.
!Material losses
Check whether the ceiling can bear the weight of the
appliance.
!Material losses
The installation room must be free from the risk of frost.
!Material losses
In dwellings in which only one air conditioning unit is
installed or planned, the appliance must only be operated
with one enthalpy heat exchanger.
Otherwise material losses may arise due to the formation
of condensation.
!Material losses
Ensure the appliance is level after installation.
LWZ 130: The installation room must have an adequate condensate
drain with siphon.
Minimum clearances
≥20
≥10 ≥200
≥400 ≥400
D0000068464
≥300
M8
D0000075157
The appliance must be accessible from below for changing filters
and maintenance purposes. Mount a cover (600 x 1200mm) be-
neath the appliance or design the suspended ceiling in such a way
that it is removable under the appliance.

INsTALLATIoN
Installation
www.stiebel-eltron.com LWZ130 | 41
ENGLISH
9.3 Transport
!Material losses
If possible, transport the appliance to the installation lo-
cation in its original packaging.
If the appliance is transported without packing and with-
out using a pallet, its outer casing may be damaged.
Make sure that no objects drill through the outer enve-
lope of the appliance.
!Material losses
Never use the air connections as handles for carrying
the appliance.
10. Installation
WARNING Electrocution Do not install the appliance if it is damaged and there is
a risk that live components could be touched.
f Check the appliance for external damage.
!Material losses
f Make sure that there are no sharp objects at the in-
stallation location that could drill through the outer
envelope of the appliance.
10.1 Mounting the appliance
!Material losses
f Check whether the ceiling can bear the weight of the
appliance.
!Material losses
f LWZ 130: Always install the appliance horizontally
so that any condensate arising can flow into the con-
densate drain.
Note The filter cassettes are located at the bottom of the ap-
pliance.
Note Install the appliance before mounting the ceiling panels
of the suspended ceiling.
Note f When positioning the appliance, ensure there is
sufficient space to install the supply and extract air
ducts (see chapter "Preparations/ Specification/
Installation site/ Minimum clearances").
f Drill holes in the ceiling for mounting the appliance with
threaded pins or double ended screws.
f Fit the following parts onto each threaded pin in the se-
quence described.
2
3
4
5
7
1
6
D0000087298
8
1 Nut
2 Washer
3 Anti-vibration mounts
4 Unit mounting
5 Anti-vibration mounts
6 Washer
7 Nut
8 Nut (Lock nut)
f Use a spirit level to check whether the appliance is level
horizontally.
f Level the appliance horizontally by turning the nuts.
10.2 Connecting the condensate drain hose
Note A condensate drain hose must not be connected in the
case of appliances with an enthalpy heat exchanger.
!Material losses
The weight of the condensate drain hose and condensate
pump must not exert a leverage effect on the appliance
condensate drain connection. This could cause the con-
densate drain connection to leak or break off.
f Secure the condensate drain hose, e.g. to the ceiling.
!Material losses
To ensure that condensate drains correctly, always lay
the condensate drain hose without any kinks. Lay the
condensate drain hose with a fall of at least 10%. Ensure
the appliance is level after installation.
The drain pipe may only contain one siphon. The con-
densate must be able to drain freely downstream of the
siphon.
The condensate must drain away via the domestic sewer
system. The pipes must not rise in the domestic sewer
system downstream of the siphon. The condensate drain
must be free from the risk of frost.

INsTALLATIoN
Installation
42 | LWZ130 www.stiebel-eltron.com
Note Prevent air from being drawn in through the condensate
drain.
f Install the condensate drain hose in such a way as to
create a siphon with a water trap height of at least
60mm.
f Before connecting the condensate drain hose to the appli-
ance, pour water into the siphon.
f Push a condensate drain hose onto the condensate drain
connection.
f Prevent the condensate drain hose from slipping off the con-
densate drain connection, e.g. with a cable tie.
10.2.1 Optional: Condensate pump
Standard delivery
- Pump assembly: The pump assembly consists of a pump
module and a float module that are already connected elec-
trically and to a condensate hose in their delivered condition.
- Vent hose
- Hose bend for the connection between appliance and float
module.
- 3 cable ties
Installation
f Flush the condensate pan with water so that no impurities
(e.g. metal swarf or EPS beads) block the condensate pump.
D0000075532
f Hook the condensate pump assembly onto the hooks provid-
ed on the long side of the appliance.
D0000075533
2
1
3
1 Vent hose
2 Hose bend
3 Vent hose
f Push the supplied hose bend onto the appliance condensate
drain connection. Secure the hose bend with a cable tie.
f Push the other end of the hose bend onto the connection on
the float module. Secure the hose bend with a cable tie.
f Connect the supplied vent hose to the float module. The con-
nection on the float module is above the condensate outlet.
f Undo the cable tie that has sealed the vent hose which comes
out of the appliance.
f Push the vent hoses into one another.
D0000075768
f Connect a condensate hose to the condensate outlet of the
condensate pump and route it into a drain. In order for the
condensate pump not to run dry, the condensate hose behind
the pump must not route directly downwards.
f Connect the power supply of the condensate pump.
Colour
GN Ground
WH Neutral
BK Phase
10.3 Air ducts
!Material losses
Never link cooker hoods to the ventilation system.
!Material losses
During installation, ensure that no metal swarf enters
the pipework. However, should this occur, remove this
debris, otherwise the fans may be damaged.
Install the air ducts using materials that can be obtained from us
or with commercially available folded spiral-seam tubes.
10.3.1 Insulation against condensation
!Material losses
When warm air meets cold surfaces, condensation can
result.
f For outdoor air and exhaust air ducts, use vapour
proof thermally insulated pipes.
f If the supply and extract air ducts are routed
through unheated rooms, insulate these ducts as
well.

INsTALLATIoN
Installation
www.stiebel-eltron.com LWZ130 | 43
ENGLISH
10.3.2 Connecting air ducts to the appliance
You can connect air ducts with two different diameters to the
appliance.
Air ducts with diameter DN125
D0000080367
f Push the air duct onto the air connection.
D0000080369
f Secure the air duct at the appliance air duct connection with
self-adhesive aluminium sealing tape.
Optional: Air ducts with diameter DN150
You can obtain DN150 air duct connectors from us as accessories.
f Remove the air duct connectors mounted in the delivered
condition by undoing the screws.
f Screw the new air duct connectors onto the appliance.
10.3.3 External wall ducts
Install the outdoor air intake into the building at a location where
contamination (dust, soot, odours, flue gas, exhaust air) is as low
as possible.
When installing external wall ducts, prevent any short circuit be-
tween the air intake and the air discharge.
10.3.4 Silencer
f Install a silencer in both the supply air duct and the extract
air duct. Install these silencers as close as possible to the ap-
pliance, so that noise is suppressed at an early stage.
We recommend installing additional silencers if required to avoid
sound transmission.
If a room with a high noise level needs to be ventilated, install
additional silencers upstream of this room to reduce sound trans-
mission to the neighbouring rooms.
Aspects such as carried voices and impact sound must also be
taken into consideration in the case of ducts embedded in con-
crete. Carried voices should be avoided by designing the duct with
separate branches to the vents. If necessary, insulate the supply air
ducts, e.g. if they are mounted outside the insulated wall panel.
10.3.5 Overflow apertures
Living rooms and bedrooms are only supplied with air. Air is only
extracted from rooms where odours and moisture are generated.
Ensure an unimpeded overflow and consequently air balancing.
Install ventilation grilles in internal doors or walls, or enlarge the
air gap beneath the door to ≥8mm.
10.3.6 Cleaning apertures
f Fit cleaning apertures when installing the air ducts, so
that the air ducts can be inspected and cleaned at regular
intervals.
10.3.7 Supply and extract air vents
Supply and extract air vents for the living space are available for
wall or ceiling mounting.
When venting the kitchen, ensure that the extract air vent is fitted
as far as possible from the cooker.

INsTALLATIoN
Installation
44 | LWZ130 www.stiebel-eltron.com
10.4 Electrical connection
WARNING Electrocution Carry out all electrical connection and installation work
in accordance with national and regional regulations.
WARNING Electrocution The connection to the power supply must be in the form
of a permanent connection. Ensure the appliance can be
separated from the power supply by an isolator that dis-
connects all poles with at least 3mm contact separation.
This requirement can be met by contactors, isolators,
fuses, etc.
WARNING Electrocution Before any work on the appliance, isolate the connecting
cables in the control panel.
WARNING Electrocution Do not install the appliance if it is damaged and there is
a risk that live components could be touched.
f Check the appliance for external damage.
!Material losses
Observe the fuse protection required for the appliance
(see chapter "Specification/ Data table").
Note For the power cable, connections and connecting cables
to external control equipment, see chapter "Electrical
connection" and the wiring diagram in chapter "Spec-
ification".
Take the power consumption of the preheating coil into consid-
eration.
Netzanschluss
Mains Connection
X11
Fernbedienung
Remote Controller
4321
326775-K40138
Elektr. Anschluss
Electr. Connection
X19
Keine Funktion
No Function
X18
Passivkühlung
Passive Cooling
2
1
X20
Intensivlüftung
Intensive Ventilation
2
1
D0000075765
X1
X1 Power supply
X11 Programming unit connection (Safety extra low voltage)
X18 Window contact connection (Floating)
X19 No function
X20 Intensive ventilation connection (Floating)
Power supply
The appliance is delivered with a power cable without a plug.
Strain relief casing
Note Never place the half shells of the strain relief casing to-
gether before you have prepared the cable and connected
the plug.
1.
2.
D0000068548
Cable cross-section mm20.25 - 1.5
Sheath diameter mm 4.5 - 8
Insulation stripping length mm 9
f Prepare the end of the cable by stripping the sheath and
insulation.
f Push the wires into the side of the plug labelled with the
terminal assignment. If necessary, press a screwdriver on the
clamping springs to make it easier to insert the wires.
f Carefully put the plug into the flat insulation semi-shell of
the strain relief casing so that the terminal labelling remains
visible. The locking tabs on the sides of the plug must engage
in the top tabs of the strain relief casing.
f Make sure that the strain relief gutter is inserted in the upper
insulation semi-shell of the strain relief casing.
f Push the upper insulation semi-shell carefully onto the lower
insulation semi-shell. The locking tabs on the sides of the
lower insulation semi-shell must engage in the recesses of
the upper insulation semi-shell.
Programming unit
X11: Programming unit connection (Safety extra low voltage)
The programming unit is connected with an I²C bus. See program-
ming unit operating and installation instructions.
The programming unit is delivered with an adaptor cable whose
wires are marked with numbers. Connect the adaptor cable in
such a way that the same numbers are connected to one another.
Safety equipment for stove/fireplace operation
f Install the safety equipment in such a way that it interrupts
the appliance power supply when required.
Intensive ventilation switching contact
You can connect a floating switching contact, the actuation of
which switches the appliance to intensive ventilation. You can set
the runtime for intensive ventilation in parameter P2. After this
time has expired, the appliance returns to the previously appli-
cable fan stage.

INsTALLATIoN
Commissioning
www.stiebel-eltron.com LWZ130 | 45
ENGLISH
Window contact
You can connect a window contact to terminal X18. The window
contact is required for passive cooling. The appliance checks
whether a window contact is connected and activated at X18.
The window contact must be an N/O contact.
10.5 Overflow apertures
Create suitable overflow apertures in the supply air area or over-
flow area. This is absolutely essential, since otherwise passive
cooling is not possible.
11. Commissioning
!WARNING Injury
If the unit is switched on without the air ducts connected
and someone reaches through the air connectors into the
unit, there is a risk of injury.
Do not commission the unit until the air ducts are firmly
connected to it.
!Material losses
Never operate the appliance without filters.
!Material losses
Never operate the ventilation system if there are high lev-
els of dust inside the building or outside in the immediate
vicinity, as this could block the filter. Dust is created by
cutting tiles or working with plasterboard, for example.
11.1 Initial start-up
f To access the parameters, press the “MENU” button.
Display Description
 P1 - Pxx Parameter
 I1 - Ixx Actual values
 Pro Programs
 Cod Entry of the code for unlocking protected parameters and actual
values
f Enter 1000 to enable actual values and parameters which are
reserved for qualified contractors.
Enable fan
The fans are deactivated in the delivered condition.
f P28: Set the parameter to "On".
Setting air flow rates
f Use parameters P6 to P9 to set the air flow rates for the fan
stages.
Date
f Set the current day of the week.
P80 1Monday
2Tuesday
3Wednesday
4Thursday
5Friday
6Saturday
7Sunday
Time
f Set the current time.
P81 00:00 -23:59
11.2 Recommissioning
f Check whether filters are fitted in the appliance. Never oper-
ate the appliance without filters.
f Check whether the condensate drain hose is damaged or
kinked.

INsTALLATIoN
Settings
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12. Settings
12.1 Parameter
LWZ 130 LWZ 130 Enthalpie
Description Code Unit Min. Max. Options Stand-
ard
Min. Max. Options Stand-
ard
P1 Set room temperature A0 °C 528 20 528 20
P2 Intensive ventilation runtime A0 min 1240 30 1240 30
P3 Passive cooling operating mode A0 0| 1| 2 | 3 2 0| 1| 2 | 3 2
P4 Reset filter A0 0| 1 0 0| 1 0
P6 Flow rate, stage0 A1 m³/h 50 100 50 50 100 50
P7 Flow rate, stage 1 A1 m³/h 50 180 90 50 180 90
P8 Flow rate, stage 2 A1 m³/h 50 180 125 50 180 125
P9 Flow rate, stage 3 A1 m³/h 110 180 180 110 180 180
P14 Supply air flow rate offset A1 m³/h -100 100 0 -100 100 0
P15 Humidity protection interval A1 h 1 24 1 1 24 1
P16 Start-up time for humidity measurement A1 min 515 5 5 15 5
P17 Extract air humidity limit A1 % 5 95 65 595 65
P18 Frost protection temperature A1 °C -5.0 15.0 2 -5.0 15.0 2
P19 Filter change interval A1 d 1 365 90 1365 90
P22 Enable preheater A1 0| 1 1 0| 1 1
P24 Passive cooling release temperature A1 °C 5.0 15.0 10 5.0 15.0 10
P25 Passive cooling blocking temperature A1 °C 5.0 15.0 8 5.0 15.0 8
P26 Passive cooling hysteresis A1 K0.0 5.0 2 0.0 5.0 2
P27 Temperature differential for enabling pas-
sive cooling
A1 °C 0.0 5.0 2 0.0 5.0 2
P28 Enable fan A0 On| OFF On On| OFF On
P29 Appliance type A1 3 4
P30 Temperature for enabling frost protection A1 °C -10.0 5.0 -3 -10.0 5.0 -3
P31 Enabling of humidity-dependent flow rate
control
A1 0| 1 0 0| 1 1
P32 Enable outdoor air condensate prevention A2 0| 1 0 0| 1 0
P33 Temperature offset for condensate pre-
vention
A2 K -5.0 5.0 0 -5.0 5.0 0
P34 Passive cooling operating mode A2 0| 1 1 0| 1 1
P35 Bypass night mode A2 1| 2 | 3 1 1| 2 | 3 1
P70 Delete fault list A1 0| 1 0 0| 1 0
P80 Day A0 1 7 1 7
P81 Time A0 00:00 23:59 00:00 23:59
P82 Level of lighting A0 2 10 10 2 10 10
P83 Mode of backlighting A0 Auto | On| OFF Auto Auto | On| OFF Auto
P84 Illumination duration A0 s 10 500 60 10 500 60
P85 Lower standard display A0 OFF | Time| Set room
temperature| Extract air
temp.| Extract air humidity
OFF OFF | Time| Set room
temperature| Extract air
temp.| Extract air humidity
OFF
P28: Delivered condition OFF

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Settings
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ENGLISH
P14: Supply air flow rate offset
Use this parameter to adjust the supply air flow rate during com-
missioning. The offset relates to standard ventilation. The offset
is converted internally as a percentage for the other fan stages.
Example
- Nominal flow rate (stage2): 125m³/h
- Offset: 25m³/h
Stage Set
flow
rate
Off-
set
Set flow rate
+ offset
Offset
factor
Internal set flow rate
= set flow rate* off-
set factor
050 50*1.2 = 60
190 90*1.2 = 108
2125 25 125+25 = 150 150/125 = 1.2 125*1.2 = 150
3180 180*1.2 = 216
P15: Humidity protection interval
If you set fan stage 0, the appliance switches to a 24 hour dormant
phase. The humidity protection control unit only starts after this.
The appliance measures the humidity of the extract air for the
time set in P16. The appliance compares the last measured value
with the limit value set in P17. If the limit value is exceeded, the
appliance starts to ventilate. The appliance stops the ventilation
once the limit value is fallen below. At this point, the humidity
protection interval restarts, at the end of which the moisture is
measured.
P16: Start-up time for humidity measurement
The appliance measures the humidity of the extract air for the time
set in P16. The appliance compares the last measured value with
the limit value set in P17.
P22: Enable preheater
Effect
0The internal preheater is completely deactivated.
1 The internal preheater is activated. In order to keep the heat exchanger
free from ice, the preheater ensures a minimum supply air temperature
with reference to the frost protection temperature adjustable in param-
eter P18.
While this parameter is being displayed or adjusted, the "frost
protection" symbol is shown on the display.
P24: Passive cooling release temperature
To enable checking of the other parameters for passive cooling,
the outdoor air temperature must be no less than the value set
in this parameter.
P25: Passive cooling blocking temperature
If the outdoor air temperature falls below this blocking tempera-
ture, passive cooling is deactivated.
P26: Passive cooling hysteresis
To make cooling possible, the outdoor air temperature must be
lower than the extract air temperature by the value set in this
parameter.
P27: Temperature differential for enabling passive
cooling
Use this parameter to define the temperature differential that
must be exceeded for passive cooling to be enabled. In order for
passive cooling to be enabled, the following condition must apply
for 60minutes:
P3 = 2: Outdoor air temperature > set room temperature + P27
P3 = 3: Extract air temperature > set room temperature + P27
P29: Appliance type
This parameter is set at the factory. The parameter can only be set
after the controller assembly has been replaced.
P30: Temperature for enabling frost protection
The unit only activates frost protection heating if the outdoor air
temperature drops to the value that can be set in this parameter.
P31: Enabling of humidity-dependent flow rate
control
With humidity-dependent flow rate control, the air flow rate is
increased or decreased depending on the humidity level.
Options Effect
0Deactivated
1Activated
P32: Enable outdoor air condensate prevention
If the unit is in ventilation mode and this parameter has the value
1, the unit checks the following conditions:
- Outdoor air temperature > Extract air temperature
- Extract air temperature + P33 < 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
P33: Temperature offset for condensate prevention
This parameter is used to vary the shutdown point for condensate
prevention.This allows the fans to be switched off 2K before the
dew point temperature is reached, for example.

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Appliance shutdown
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P34: Window contact operating mode
f Set whether the window contact should be taken into account
in the bypass function.
Effect
0 The supply air fan is switched off independently of the window contact.
1 Whether the appliance switches off the supply air fan depends on the
window contact.
P35: Bypass function cooling/heating
f Set the operating mode of the bypass function.
Effect
0cooling / heating
1cooling
2heating
P70: Delete fault list
To delete the fault list, set this parameter to 1. Press the "OK"
button to confirm. Afterwards, 0 is displayed again and the fault
list is deleted.
12.2 Actual values
Description Unit
I1 Passive cooling status
I2 Extract air temperature °C
I3 Relative humidity of extract air %
I4 Filter service life h
I5 Appliance software version
I6 Unit software patch
I7 Terminal device serial number
I8 Programming unit software version
I9 Outdoor air temperature °C
I10 Supply air temperature °C
I12 Relative humidity of outdoor air %
I13 Extract air dew point °C
I14 Outdoor air dew point °C
I15 Supply air fan drive output %
I17 Exhaust air fan drive output %
I19 Percentage output of internal preheating %
I20 Ventilation unit operating time d
I21 Fan operating time d
I23 Fan speed, supply air fan rpm
I24 Fan speed, exhaust air fan rpm
I70-79 Fault
12.3 Code
Cod
Enter 1000 to enable actual values and parameters, which are
reserved for qualified contractors. "A1" is shown on the display
when this is entered correctly.
13. Appliance shutdown
We recommend running the appliance in fan stage1, even during
prolonged absence.
!Material losses
If you interrupt the power supply to the appliance, check
that humidity protection is ensured for the building.
If the appliance needs to be taken out of use for an extended
period, disconnect it from the power supply.
f Replace the filters.
14. Maintenance
WARNING Electrocution Disconnect the appliance from the power supply before
carrying out work inside the appliance.
Activity Maintenance inter-
val (in years)
Cleaning the condensate pan 1
Condensate drain 1
Clean cross-countercurrent heat exchanger 3
Fan 3
Preheater 2
Air ducts 3
f Open the cover beneath the appliance or remove the sus-
pended ceiling panels under the appliance.
f Interrupt the power supply.
Condensate pan
D0000068467
1
1
2
1 Condensate pan fixing screws
2 Condensate pan
f Undo the fixing screws of the condensate pan.
f Remove the condensate pan from the appliance carefully as it
may still contain water.
Condensate drain
!Material losses
A blocked condensate drain can cause appliance faults.
If the condensate drain is blocked, condensate can escape
from the appliance in an uncontrolled manner and cause
water damage.