STIEBEL ELTRON LWZ 504 Instruction Manual

OPERATION
Central ventilation appliance with heat recovery
» LWZ504
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CONTENTS | SPECIAL INFORMATION
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������3
1.1 Safety instructions����������������������������������������������� 3
1.2 Other symbols in this documentation ����������������������� 3
1.3 Units of measurement ������������������������������������������ 3
2. Safety����������������������������������������������������������3
2.1 Intended use������������������������������������������������������ 3
2.2 General safety instructions ������������������������������������ 3
2.3 CE designation ��������������������������������������������������� 4
2.4 Test symbols ������������������������������������������������������ 4
3. Appliance description ���������������������������������������4
4. Operation �����������������������������������������������������5
4.1 Controls������������������������������������������������������������ 5
4.2 Operating modes ������������������������������������������������ 7
4.3 Favourites, quick access, function block �������������������� 7
4.4 Entering parameters �������������������������������������������� 8
4.5 Main menu�������������������������������������������������������� 9
 ACTUAL VALUES�������������������������������������������������� 9
 DIAGNOSIS �������������������������������������������������������� 9
 SYSTEM STATUS�������������������������������������������������� 9
 FAULT LIST��������������������������������������������������������� 9
 PROGRAMS ������������������������������������������������������ 10
 HEATING PROGRAM�������������������������������������������� 10
 DHW PROGRAM ������������������������������������������������� 10
 FAN PROGRAM �������������������������������������������������� 10
 HOLIDAY PROGRAM �������������������������������������������� 10
 PARTY PROGRAM ����������������������������������������������� 11
 SETTINGS��������������������������������������������������������� 11
 HEATING ���������������������������������������������������������� 11
 DHW ��������������������������������������������������������������� 13
 VENTILATION ���������������������������������������������������� 13
 COOLING ���������������������������������������������������������� 14
 SOLAR POWER��������������������������������������������������� 14
 DRY HEATING PROGRAM �������������������������������������� 15
 COMMISSIONING ������������������������������������������������ 15
 TIME / DATE ������������������������������������������������������ 15
 CONTRACTOR ���������������������������������������������������� 16
5. Cleaning, care and maintenance ������������������������� 16
5.1 Replacing supply air and extract air filters���������������� 16
6. Troubleshooting �������������������������������������������� 17
6.1 Filter symbols appear������������������������������������������ 17
6.2 No hot water����������������������������������������������������� 17
6.3 The safety valve of the cold water supply line is
dripping ���������������������������������������������������������� 17
6.4 The fault symbol appears ������������������������������������� 18
6.5 The appliance leaks water ������������������������������������ 18
6.6 Condensate on the outside of the appliance or on the
air hoses���������������������������������������������������������� 18
6.7 Noise is emitted������������������������������������������������� 18
6.8 The required flow temperatures are not reached,
particularly during drying out ������������������������������� 18
6.9 The accommodation is always too cold �������������������� 18
6.10 The accommodation is always too hot ��������������������� 18
SPECIAL INFORMATION
- The appliance may be used by children aged8
and older and persons with reduced physical,
sensory or mental capabilities or a lack of ex-
perience and know-how, provided that they are
supervised or they have been instructed on how
to use the appliance safely and have understood
the resulting risks. Children must never play with
the appliance. Children must never clean the ap-
pliance or perform user maintenance unless they
are supervised.
- The power cable must only be replaced (for ex-
ample if damaged) by qualified contractors au-
thorised by the manufacturer.
- The appliance is pressurised. During the heat-up
process, expansion water will drip from the safety
valve.
- Regularly activate the safety valve to prevent
it from becoming blocked, e.g. by limescale
deposits.
6.11 The accommodation is too cold in winter������������������ 18
6.12 The accommodation is too hot in winter������������������� 18
6.13 The accommodation is too cold in spring and autumn � 18
6.14 The accommodation is too hot in spring and autumn �� 18
6.15 The accommodation is too hot in summer ���������������� 18
6.16 Air quality is too poor������������������������������������������ 18
6.17 The air in winter is too dry ����������������������������������� 18
7. Menu structure ��������������������������������������������� 20
GUARANTEE | ENVIRONMENT AND RECYCLING
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OPERATION
General information
ENGLISH
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OPERATION
1. General information
This manual is intended for the appliance user and qualified con-
tractors.
Note
Read these instructions carefully before using the appli-
ance and retain them for future reference.
Pass on the instructions to any new user where appro-
priate.
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.
 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
Notes are bordered by horizontal lines above and below
the text. General information is identified by the adjacent
symbol.
 Read these texts carefully.
Symbol Meaning
Material losses
(appliance damage, consequential losses and environmen-
tal pollution)
Appliance disposal
 This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
These symbols show you the software menu level (in
this example: level3).
1.3 Units of measurement
Note
All measurements are given in mm unless stated oth-
erwise.
2. Safety
2.1 Intended use
The appliance is a complete system with heat recovery for cen-
tralised ventilation and extraction, as well as for centralised DHW
heating and central heating.
This appliance is intended for domestic use. It can be used safely
by untrained persons. The appliance can also be used in a non-do-
mestic environment, e.g.in a small business, 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 is also part of the correct
use of this appliance.
2.2 General safety instructions
Operate the appliance only when fully installed and with all safety
equipment fitted.
Check the supply air and extract air filters regularly for contam-
ination.
Never adjust the setting of supply and extract air valves inside the
rooms. These have been adjusted during commissioning.
Never make any modifications to the internal equipment electrics
or controls.
WARNING Electrocution
Never splash the appliance with water or other liquids.
WARNING Burns
There is a risk of scalding at outlet temperatures in ex-
cess of 43°C.
!
!
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OPERATION
Appliance description
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!
WARNING Injury
The appliance may be used by children aged 8 and older
and persons with reduced physical, sensory or mental
capabilities or a lack of experience and know-how, pro-
vided that they are supervised or they have been in-
structed on how to use the appliance safely and have
understood the resulting risks. Children must never play
with the appliance. Children must never clean the ap-
pliance or perform user maintenance unless they are
supervised.
Note
The appliance is pressurised. During the heat-up process,
expansion water will drip from the safety valve.
 If water continues to drip when heating is complet-
ed, please inform your qualified contractor.
!
WARNING – INJURY
If there is a radio or police announcement ordering win-
dows and doors to be kept closed, simply select fan stage
"0" (= fan off) for several hours.
The programming unit must be activated if the appliance
has been out of operation for a long time:
 Hold down "MENU" button for three seconds.
 If you have already navigated through the menu
tree, pressing MENU will return you to the default
display. If necessary you may have to press menu
several times.
 Slide your finger along the scroll wheel until you
reach the "VENTILATION STAGES" entry.
 Press "OK".
 Press "OK" again to adjust the "UNSCHEDULED
VENT." parameter.
 Set the "UNSCHEDULED VENT." parameter to 0 by
sliding your finger anti-clockwise over the scroll
wheel.
 Confirm with "OK".
 Set the "UNSCHED. VENT TIME STAGE 0" parameter
to a suitable value.
Note
Do not change any system-specific settings at the control
unit. Your qualified contractor has set the control unit
to match the local conditions for your building and your
individual requirements. The system-specific parameters
are protected by a code to prevent unintentional mod-
ifications.
The parameters that serve to adapt the appliance to your
personal requirements are not protected by a code.
2.3 CE designation
The CE designation shows that the appliance meets all essential
requirements according to the:
- Electromagnetic Compatibility Directive
- Low Voltage Directive
2.4 Test symbols
See type plate on the appliance.
3. Appliance description
Heat is recovered from the extract air by means of a highly efficient
cross-countercurrent heat exchanger and an air/water heat pump.
In addition, heat is extracted from the outdoor air. This energy,
efficiently made available by the heat pump, is channelled to the
central heating or DHW system. The cooled air is discharged out-
doors as exhaust air.
When the temperature is very low, or when there is a very high
heat demand, the appliance covers the residual heat demand by
means of an integral electric emergency/booster heater. With a
mono mode design, the electric emergency/booster heater is acti-
vated for emergency heating if the temperature reading falls below
the standard outside temperature, set as the dual mode point.
This ensures heating operation and the provision of high DHW
temperatures. In mono energetic mode, the electric emergency/
booster heater is activated as a booster heater.
The appliance is controlled by a weather-compensated control
unit.
Inverter
The compressor in the appliance has an electronic speed con-
troller. The compressor adjusts its output to the cooling/heating
demand. If the current room temperature is far from the set tem-
perature, the provision of cooling/heating output will be accord-
ingly high. If the temperature differential decreases, the appliance
reacts to the change in requirements and provides a lower cooling
or heating output. This results in advantages of economy and
convenience when compared with appliances without inverter
technology, where the compressor either runs at maximum out-
put or is switched off.
Cooling function
This appliance is suitable for cooling. This is achieved by extracting
heat from the heating system through a reversal of the heat pump
circuit. The heat extracted from the heating water is transferred
by the evaporator to the outdoor air.
The cooling function requires an external programming unit.
The "Cooling" menu will be shown if an external "FES Comfort"
programming unit is connected to the CAN BUS (the control unit
can supply up to two programming units) and recognised by the
control unit.
Heat metering
The appliance is equipped with an integral heat meter. In the "AC-
TUAL VALUES" menu, the supplied amounts of heat are displayed.
Solar backup
A solar thermal system can be connected via a solar heat exchang-
er. Solar backup can be provided both in central heating mode
and DHW mode. A differential temperature controller for the solar
thermal system is integrated in the appliance control unit.
A heat exchanger built into the outdoor air flow heats the outdoor
air for domestic ventilation. If sufficient solar heat is available, the
outside air is preheated indirectly by solar energy.
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OPERATION
Operation
ENGLISH
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4. Operation
4.1 Controls
WEDNESDAY 10 SEPT 14 10:23 H
OUTSIDE TEMPERATURE
DHW TEMPERATURE
27.0 °C
35.0 °C
28.0 °C
FLOW TEMPERATURE
DAY M ODE
26�04�01�0309
The programming unit enables you to change parameters and
to obtain information on the appliance operation. The appliance
can also be controlled when no programming unit is connected
or the connected one is faulty. The programming unit comprises
the scroll wheel, two keys and above these a display. The display
shows the current appliance status and provides messages as well
as information. The programming unit functions are accessed via
a menu tree. With the scroll wheel, you can navigate the menu
structure and change values.
4.1.1 Display
26�04�01�0292
WEDNESDAY 10 SEPT 14 10:23 H
OUTSIDE TEMPERATURE
DHW TEMPERATURE
27.0 °C
35.0 °C
28.0 °C
FLOW TEMPERATURE
DAY MODE
1
2
3
4
1 Date and time
2 Favourites
3 Operating mode
4 Appliance status symbols
The start screen is divided into four sections by horizontal lines.
The time and date are at the top. In the field below this, your
favourites are displayed. Here, you can check up to three appli-
ance parameters at any time (see chapter "Favourites"). When you
are in the menu, the favourites display is no longer shown. The
third section provides information about the current operating
mode and serves to control further functions, such as quick access,
function block. In the fourth section, at the bottom edge of the
display, pictorial symbols provide information about the current
system status.
You can adjust the contrast of the display and select the language
of the display texts in the "COMMISSIONING" menu.
4.1.2 Picture symbols in the display
At the lower edge of the display, symbols provide information
about the current appliance operating status. Up to eight symbols
can be displayed at once.
Filter change, top:
The extract air filter is contaminated. Please change the
extract air filter.
Filter change, bottom:
The supply air filter is contaminated. Please change the
supply air filter.
Filter change, top and bottom:
The filter change service intervals of the extract air and
the supply air filters have expired or the filters have be-
come contaminated prematurely. Please change the ex-
tract air and supply air filters.
Electric emergency/booster heater:
The electric emergency/booster heater has started up.
This occurs, for example, when the outside temperature
has fallen below the dual mode point.
Cooling:
The cooling symbol is displayed when the appliance is
in heating mode.
Heating:
The heating symbol is displayed when the appliance is
in heating mode.
DHW heating:
This symbol tells you that the appliance is heating DHW.
Compressor:
The compressor symbol signals that the compressor is
running.
Evaporator defrost:
The evaporator is defrosting.
Switching program enabled:
If a switching program is enabled, this symbol is dis-
played.
Service:
A service is required. Please contact your qualified con-
tractor.
Ventilation stage:
For a limited period the appliance operates with a mod-
ified ventilation stage.
Heating circuit pump:
The pump symbol is displayed when a heating circuit
pump is running.
Heat-up:
This symbol shows when the drying heating program
runs.
Power-OFF:
This symbol lights up if the appliance has no enable signal
from the power supply utility.
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OPERATION
Operation
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4.1.3 Scroll wheel
26�04�01�0329
The scroll wheel consists of a touch-sensitive sensor. There is a
key to the left and another to the right of it. With the wheel and
the keys, you can control and check all the necessary appliance
functions.
Note
If you have gloves on, have wet hands or the program-
ming unit is damp, this impedes the recognition of your
touch and the execution of the action you require.
In the "COMMISSIONING" menu, your qualified contractor can set
the touch sensitivity using the "TOUCH SENSITIVITY" parameter.
Activation
The user interface is blocked to protect the appliance from acci-
dental incorrect adjustments.
WEDNESDAY 10 SEPT 14 10:23 H
OUTSIDE TEMPERATURE
DHW TEMPERATURE
14.0 °C
35.0 °C
18.0 °CFLOW TEMPERATURE.
DAY MODE
TO ACTIVATE PLEASE
PRESS MENU FOR 3 S.
...
26�04�01�0292
 Touch the menu button for 3 seconds to enable the user
interface.
If the scroll wheel and keys are not used for 20minutes, the pro-
gramming unit is locked again. With the function block, you can
block the user interface for 60 seconds.
Once the programming unit is activated, you have two adjustment
options:
- You can select operating modes with the scroll wheel.
- You can press "MENU" to continue navigating from there to a
specific appliance parameter.
Selection indicator
As you move through the menu and parameter levels, the selection
indicator shows your current position. Either a dark background
appears or the current list entry is highlighted by two lines, one
above and one below.
Circular movement
If you brush a finger clockwise along the recessed scroll wheel,
the highlighting field moves through the list of parameters either
to the right, or downwards if the parameters are arranged ver-
tically. With an anti-clockwise rotation, the highlighter moves to
the left or upwards.
Alongside navigation within the menu structure, the scroll wheel is
also used to set parameters. If you make a clockwise rotation, the
value is raised. With a circular movement anti-clockwise, values
are reduced.
Faster circular motions increase the step magnitude when chang-
ing parameters. Your qualified contractor can determine at what
speed of rotation the step magnitude changes, in the "COMMIS-
SIONING" menu using the "TOUCH ACCELERATION" parameter.
4.1.4 Menu key
The menu key has two functions. If you are on the default screen,
press "MENU" to enter the second level of the menu structure.
There, you have access to the appliance setting options, such as
the input of switching time programs.
If you are not in the highest menu level, tap the menu key to go
back one level.
Note
In the following sections of this document, the abbre-
viation "MENU" means you should touch the MENU key.
Note
Tap the keys only briefly to initiate the required action.
If you touch the menu and OK keys for too long, the pro-
gramming unit will not respond.
4.1.5 OK key
With one touch of the OK key, you confirm the selection of the
menu entry highlighted. This brings you into the menu tree on the
next menu level. If you are already at the parameter level, "OK"
saves the currently set parameter.
Example 1
In the third area on the start screen, the currently enabled oper-
ating mode is displayed, for example manual mode. If you want
to change to automatic mode, make a rotation until you reach
the required mode. Then confirm your selection with the OK key.
Only now does the appliance change to the new operating mode.
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OPERATION
Operation
ENGLISH
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Example 2
The OK key is used to confirm parameter entries. The newly set
value is not saved until you press "OK".
Note
In the following sections of this document, the abbrevia-
tion "OK" means you should touch the OK key.
4.1.6 Acoustic signals
A click sound accompanies every user action. Example: A click
is heard every time "OK" and "MENU" are tapped. Furthermore,
the clicking accompanies every step along a menu list activated
by a rotation.
4.2 Operating modes
When the start screen is activated, the current operating mode
is displayed. If you want to select another operating mode, scroll
with the scroll wheel. This takes you through the list of possible
operating modes. The current choice (list entry) is shown in the
shaded selection field. To change the appliance to this new oper-
ating mode, confirm with"OK".
WEDNESDAY 10 SEPT 14 10:23 H
OUTSIDE TEMPERATURE
DHW TEMPERATURE
14.0 °C
35.0 °C
18.0 °CROOM TEMPERATURE
DAY MODE
26�04�01�0292
The appliance can operate in the following modes: Standby mode,
automatic mode, day mode, setback mode, DHW mode, manual
mode and emergency mode. In addition, you will find five further
setting options in this selection list: the favourites, the quick access
to ventilation stages, hotter/colder, direct line, and right at the end
of the list, the function block.
Since navigation to a new operating mode is always made from the
currently enabled mode, you may need to scroll in an anti-clock-
wise direction. All operating modes, apart from DHW mode, apply
to central heating, ventilation and DHW.
4.2.1 STANDBY
In standby mode, the appliance delivers the set standby values.
Generally, you will switch the appliance into minimum operation
with standby mode. The appliance runs in standby mode until
another operating mode is enabled.
4.2.2 AUTOMATIC
In automatic mode, the time programs set for central heating,
DHW and ventilation are implemented. Automatic mode is the
standard appliance setting. The heating flow temperature is reg-
ulated according to a weather-compensated heating curve. The
appliance runs in setback mode if no time programs are enabled.
4.2.3 DAY MODE
In day mode (generally while occupants are present in the house,
during the day), the heating system operates with the selected set
day values. Day mode does not influence DHW heating or venti-
lation.
4.2.4 SETBACK MODE
The appliance activity is reduced in setback mode, for example
at night time, or during the day when nobody is at home. In set-
back mode, the heating system is operated with the selected set
night values. Setback mode does not influence DHW heating or
ventilation.
4.2.5 DHW MODE
DHW mode is enabled in accordance with the set time programs.
For the current pair of switching times, the DHW set day value
is delivered. The central heating is switched off except for frost
protection. DHW operation does not influence ventilation.
4.2.6 MANUAL MODE
If manual mode is enabled, the set values selected for manual
mode are delivered. In manual mode, the heating flow tempera-
ture is not influenced by the outside temperature.
4.2.7 EMERGENCY MODE
If emergency mode is enabled, the "Compressor" heating stage is
skipped. Heating is provided by the solar thermal system (if con-
nected) or the electric emergency/booster heater. The dual mode
point is not taken into consideration. Using the electric emergency/
booster heater on its own for long periods means high energy
costs.
If you activate emergency mode, the set room temperatures from
automatic mode are used. The switching programs from automatic
mode are also used.
4.3 Favourites, quick access, function block
As well as the operating modes, on the start screen you can also
select which parameters are always shown in the favourites list.
Additionally, you can influence the fan stage and temperature
via a quick link, jump straight to a parameter and enable the
function block.
4.3.1 Favourites
You reach "FAVOURITES" if you run through the list of operating
modes on the default screen with the scroll wheel. Up to three
parameters are constantly shown on the display when the ap-
pliance is in operation. To select your favourites, navigate to the
required parameter. If the square at the end of the line is not filled
in, this parameter is not yet one of your favourites. Press "OK" to
change this. However, you can only select three favourites. You
may therefore have to disable one of your current favourites. Press
"OK" to disable.
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OPERATION
Operation
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4.3.2 Ventilation stages
!
WARNING – INJURY
If there is a radio or police announcement ordering win-
dows and doors to be kept closed, simply select fan stage
"0" (= fan off) for several hours.
The programming unit must be activated if the appliance
has been out of operation for a long time:
 Hold down "MENU" button for three seconds.
 If you have already navigated through the menu
tree, pressing MENU will return you to the default
display. If necessary you may have to press menu
several times.
 Slide your finger along the scroll wheel until you
reach the "VENTILATION STAGES" entry.
 Press "OK".
 Press "OK" again to adjust the "UNSCHEDULED
VENT." parameter.
 Set the "UNSCHEDULED VENT." parameter to 0 by
sliding your finger anti-clockwise over the scroll
wheel.
 Confirm with "OK".
 Set the "UNSCHED. VENT TIME STAGE 0" parameter
to a suitable value.
With quick access option "VENTILATION STAGES", you reach the
setting area for the fan stage (see diagram below). Under "UN-
SCHEDULED VENT." enter the required value (0 to3). This setting is
valid for a limited time, which you set in the neighbouring menu
item, e.g. "UNSCHED. VENT TIMESTAGE 0". If you do not set a time,
the appliance adopts the saved parameter values.
26�04�01�0367
UNSCHED. VENT TIME STAGE 2
UNSCHEDULED VENT.
VENTILATION STAGES
02
4.3.3 HOTTER / COLDER
Here, you can change the set room temperatures for the heating
circuits and thereby raise or lower the heating curves.
4.3.4 DIRECT LINE
If you know the number of the required parameter (for example
P37), you can move straight there with the direct line.
 On the default screen, turn the scroll wheel until keyword
"DIRECT LINE" appears. Confirm with "OK". Select the number
of the required parameter. Confirm with "OK".
You can select parameters 01 to 89. To make the direct line easier
to use, the parameter designations are displayed along with their
numbers.
4.3.5 FUNCTION BLOCK
If you select the "FUNCTION BLOCK" function, the programming
unit will be blocked for 60 seconds. During this time, you can
clean the programming unit without accidentally changing the
appliance settings. A counter appears on the screen that shows
the remaining blocking time in seconds.
4.4 Entering parameters
If you are on a menu level where you have the choice between
different parameters, the value of the parameter is shown as a
preview in addition to the current list position.
Parameters are changed by scrolling with the scroll wheel. To
save the new value, touch "OK". If you want to cancel the entry,
press "MENU". The parameter retains the previously saved value.
Note
If more than five minutes pass without any user activity,
rotation or tapping of "MENU" or "OK", the programming
unit display automatically jumps back to the default
screen. Recent parameter changes not yet been con-
firmed with "OK" will be lost. The parameters retain the
values previously saved.
Example 1
To enter set temperatures, a number surrounded by a circle ap-
pears on the display. This indicates that you can change the value
by turning the scroll wheel.
+
21.7
-
MAIN MENU
HEATING
ROOM TEMPERATURE DAY
°C
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ROOM TEMPERATURES HC1 HC
ROOM TEMPERATURE DAY
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OPERATION
Operation
ENGLISH
www.stiebel-eltron.com LWZ504 | 9
Example 2
To set holiday dates, a calendar page for the selected month ap-
pears.
DAY MONTH YEAR HOUR MINUTE
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Settings
HOLIDAY PROGRAM-PARTYHOLIDAY PROGRAM
HOLS BEGINNING
MON TUE WED THU FRI SAT SUN
02 03 04 05 06 07 08
09 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
01
30
Turning the scroll wheel displays the highlighter that you can then
move to the required date.
Example 3
Some parameters are selected via highlighted boxes. The positions
where the box is highlighted, i.e. coloured in black, are active. One
example is setting up favourites. With "OK" you can highlight the
box, or remove it if the item was already highlighted. For favour-
ites, up to three highlighted list entries can be selected in this way.
ROOM TEMPERATURE HC1
SET ROOM TEMPERATURE HC1
ROOM TEMPERATURE HC2
SET ROOM TEMPERATURE HC2
34.2 °C
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MAIN MENU
ACTUAL VALUES
ROOM TEMPERATURE
4.4.1 Contractor access
To prevent incorrect adjustments, some appliance parameters may
only be changed by qualified contractors. These parameters are
protected and can only be changed after entering a code.
0* **
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ENTER CODE
MAIN MENU
VENTILATIONVENTILATION
FAN STAGE VENT. AIR
4.5 Main menu
Note
Some menu items are protected by a code and can only
be accessed and adjusted by a qualified contractor.
 ACTUAL VALUES
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ACTUAL VALUES
MAIN MENU
DIAGNOSIS
PROGRAMS
SETTINGS
CONTR ACTOR
In the "ACTUAL VALUES" menu, actual values are displayed. See
the chapter "Menu structure" for a list of these.
 DIAGNOSIS
 SYSTEM STATUS
POWER-OFF POWER-OFF indicates whether voltage is
present at the power supply utility input. If
voltage is present, the power supply utility
has not disabled any component of the
appliance.
OVEN / FIREPLACE
AIR HEAT EXCH. DEFR.
EVAPORATOR DEFROST
 FAULT LIST
The fault memory contains the ten most recent fault messages. The
display, however, can show only six fault messages at a time. Turn
the scroll wheel to access the other entries in the fault memory.
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MAIN MENU
DIAGNOSIS
FAULT LIST
01. FAULT NO. 20 11:00:00 H 10 SEPT 14
02. FAULT NO. 06 11:01:00 H 10 SEPT 14
03. FAULT NO. 20 12:23:00 H 10 SEPT 14
04. FAULT NO. 06 12:24:00 H 10 SEPT 14
05. FAULT NO. 20 12:34:00 H 10 SEPT 14
06. FAULT NO. 06 12:35:00 H 10 SEPT 14
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OPERATION
Operation
10 | LWZ504 www.stiebel-eltron.com
 PROGRAMS
If automatic mode is set, this is where you define the time pro-
grams that control the appliance.
 HEATING PROGRAM
HEATING CIRCUIT 1| HEATING CIRCUIT 2
You can set individual heating programs for heating circuits 1
and 2. This determines when and how often the appliance should
operate in day mode. At all other times, the appliance operates in
setback mode. You can select the set values for day and setback
mode under the menu item "ROOM TEMPERATURES".
First, select the days on which you want to enable the heating
function:
+
-
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MONDAY
MON
MAIN MENU
PROGRAMS
HEATING PROGRAM HC
HEATING CIRCUIT 1
- on individual days ("MONDAY", ... , "SUNDAY")
- from Monday to Friday ("MON - FRI")
- on Saturday and Sunday ("SAT - SUN")
- throughout the whole week ("MON - SUN")
Monday is initially offered.
 Select the day or a group of days.
 Confirm your selection with "OK".
You can now set three switching time pairs. The three switching
time pairs are shown on the display, to the right of the clock. A
switching time pair comprises the start time and end point, at
which the appliance returns to its previous state.
07:00 - 20:00
- -:- - - - -:- -
- -:- - - - -:- -
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MONDAY
MAIN MENU
PROGRAMS
HEATING PROGRAM HC
HEATING CIRCUIT 1
In this example, only one switching time pair has so far been
programmed. For switching time pairs 2 and 3, short dashes are
displayed instead of times. These switching time pairs are still
empty. Select one of the free switching time pairs with "OK" to
reach the area where you can set the associated start and end
time. Pressing "OK" brings up the display shown below. Set the
required time.
END
- -:- - - -:- -
TIME TIME
START
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MAIN MENU
PROGRAMS
HEATING PROGRAM HC
SETTINGS
Times can be entered in intervals of 15 minutes. You can set 16:30
or 16:45 h, but not 16:37 h. Confirm your entry with "OK".
Periods around midnight
Assume, for example, you want heating mode to be enabled from
22:00 h for four hours every Wednesday evening. This means the
period does not expire until the next day, Thursday, at 02:00h.
However, since the day ends at 00:00 h, two switching time pairs
are necessary for the required program. First, program the period
22:00 to 00:00h for Wednesday, then 00:00 to 02:00h for Thursday.
Deleting a switching times pair
Select the pair of switching times you want to delete. Go to the
start time change. Turn the scroll wheel to reduce the time. If you
reach 00:00 and continue to make a rotation, the pair of switch-
ing times is removed. The previously shown display appears, i.e.
dashes instead of numbers. Confirm again with OK.
 DHW PROGRAM
Here, you can set the periods when DHW is heated with reference
to the set day temperatures. In the other phases, the set night
temperatures are followed. The times are set as for the heating
programs. You can select the set values for day and night mode
as described in the DHW chapter.
Example: You want to heat up DHW daily at two different times,
i.e. from 22:00h until 05:00h the following day, and then again
from 08:00h until 11:00h. Since the day begins at 00:00h, begin
programming at 00:00h. The first pair of switching times runs
from 00:00h until 05:00h. The second pair of switching times
starts at 08:00h and ends at 11:00h. The third switching time
pair runs from 22:00h until 24:00h.
The pairs of switching times should be selected so that the DHW
cylinder can be completely heated up between the start and stop
times (at least 3 hours).
 FAN PROGRAM
The setting is made as for the central heating and DHW programs.
 HOLIDAY PROGRAM
During the holidays, if nobody is in the house, central heating,
DHW and ventilation are not required in their full scope. All set
temperatures are set to match the set values of the standby func-
tion. Define the first and last days of the holiday. The setting is
made as described under "Time / date". At the end of the holiday,
the appliance runs according to the set programs again.
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