Viessmann Vitotrol 350-C User manual

Operating instructions
for the system user
Viesmann
Remote control unit and cascade controller
VITOTROL 350-C
5778 774 GB 2/2016 Please keep safe.

2
Please follow these safety instructions closely to
prevent accidents and material losses.
Safety instructions explained
Danger
This symbol warns against the risk of injury.
!Please note
This symbol warns against the risk of material
losses and environmental pollution.
Note
Details identified by the word "Note" contain additional
information.
Target group
These operating instructions are intended for heating
system users.
This appliance can also be operated by children 8
years and older, as well as by individuals with reduced
physical, sensory or mental faculties or those lacking
in experience and knowledge, provided such individu-
als are being supervised or have been instructed in the
safe use of this appliance and any risks arising from it.
!Please note
Supervise children in the proximity of the appli-
ance.
■Never permit children to play with the appli-
ance.
■Cleaning and maintenance must not be car-
ried out by unsupervised children.
Appliance connection
■The appliance may only be connected and commis-
sioned by authorised contractors.
■Only operate the appliance with suitable fuels.
■Observe the specified electrical connection require-
ments.
■Modifications to the existing installation may only be
carried out by authorised contractors.
Danger
Incorrectly executed work on the heating system
can lead to life threatening accidents.
■Work on gas installations must only be carried
out by a registered gas fitter.
■Work on electrical equipment must only be
carried out by a qualified electrician.
Work on the appliance
■All settings and work on the appliance must be car-
ried out as specified in these operating instructions.
Further work on the appliance may only be carried
out by authorised contractors.
■Never open the appliance.
■Never remove casings.
■Never change or remove attachments or fitted
accessories.
■Never open or retighten pipe connections.
Danger
Hot surfaces can cause burns.
■Never open the appliance.
■Never touch the hot surfaces of uninsulated
pipes, fittings or flue pipes.
Damage to the appliance
Danger
Damaged equipment poses a safety hazard.
Check the appliance for external damage. Never
start up a damaged appliance.
If you smell gas
Danger
Escaping gas can lead to explosions which may
result in serious injury.
■Never smoke. Prevent naked flames and
sparks. Never switch lights or electrical appli-
ances on or off.
■Close the gas shut-off valve.
■Open windows and doors.
■Evacuate any people from the danger zone.
■Notify your gas and power supply utility and
your local heating contractor from outside the
building.
■Have the power supply to the building shut off
from a safe place (outside the building).
If you smell flue gas
Danger
Flue gas can lead to life threatening poisoning.
■Shut down the heating system.
■Ventilate the installation site.
■Close all doors in the living space.
In case of fire
Danger
Fire presents a risk of burns and explosion.
■Shut down the heating system.
■Close the shut-off valves in the fuel supply
lines.
■Use a tested fire extinguisher, class ABC.
Safety instructions
For your safety
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In case of water leaking from the appliance
Danger
Water leaking from the appliance poses an elec-
trocution hazard.
■Switch off the heating system at the external
isolation point (e.g. fuse box, domestic power
distribution unit).
■Notify your local heating contractor.
What to do if the heating system develops a fault
Danger
Fault messages point to faults in the heating
system. If faults are not rectified, they can have
life threatening consequences.
Never acknowledge fault messages several
times in quick succession. Inform your heating
contractor so the cause can be analysed and
the fault rectified.
Installation room requirements
Danger
Sealed vents result in a lack of combustion air.
This leads to incomplete combustion and the
formation of life threatening carbon monoxide.
Never cover or close existing vents.
Never make any subsequent modifications to
the building characteristics that could affect safe
operation (e.g. cable/pipework routing, cladding
or partitions).
Danger
Easily flammable liquids and materials (e.g.
naphtha, solvents, cleaning agents, paints or
paper) can cause deflagration and fire.
Never store or use such materials in the installa-
tion room or in direct proximity to the heating
system.
!Please note
Incorrect ambient conditions can lead to heating
system damage and can put safe operation at
risk.
■Ensure ambient temperatures are above 0 °C
and below 35 °C.
■Prevent air contamination by halogenated
hydrocarbons (e.g. as contained in paints, sol-
vents or cleaning fluids) and excessive dust
(e.g. through grinding/polishing work).
■Avoid continuously high humidity levels (e.g.
through continuous drying of washing).
Extractors
The operation of appliances that extract air to the out-
side (cooker hoods, extractors, air conditioning units,
etc.) can create negative pressure. If the boiler is oper-
ated at the same time, this can lead to a reverse flow
of the flue gas.
Danger
The simultaneous operation of the boiler and
appliances that extract air to the outside can
result in life threatening poisoning due to
reverse flow of the flue gas.
Take suitable steps to ensure an adequate sup-
ply of combustion air. If necessary, contact your
heating contractor.
Auxiliary components, spare and wearing parts
!Please note
Components not tested with the heating system
may damage the system or affect its function.
Have all installation or replacement work carried
out exclusively by qualified contractors.
Safety instructions
For your safety (cont.)
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1. Introductory information Symbols ................................................................................................. 6
Terminology ........................................................................................... 6
Intended use .......................................................................................... 6
Commissioning ...................................................................................... 7
■Permissible ambient temperature ....................................................... 7
Energy saving tips ................................................................................. 7
Tips for greater comfort ......................................................................... 8
■Central heating ................................................................................... 8
■DHW heating ...................................................................................... 8
2. Operation Controlsand symbols ............................................................................. 9
■Programming unit default display ....................................................... 9
■Symbols in the display ........................................................................ 9
■Screensaver ....................................................................................... 9
Menu navigation .................................................................................... 10
■Settings made via the default display ................................................. 10
■Settings made via the menu ............................................................... 10
3. Central heating Central heating settings ......................................................................... 11
Heating circuit selection ......................................................................... 11
Setting temperatures for central heating ................................................ 11
■Setting the room temperature for standard heating mode .................. 11
■Setting the room temperature for reduced heating mode (night set-
back) ................................................................................................... 11
Operating program ................................................................................. 11
■Setting the operating program ............................................................ 11
Time program ........................................................................................ 12
■Setting a time program ....................................................................... 12
Comfort function "Party mode" .............................................................. 13
■Setting "Party mode" ........................................................................... 13
■Ending "Party mode" ........................................................................... 14
Energy saving function "Economy mode" .............................................. 14
■Setting "Economy mode" .................................................................... 14
■Ending "Economy mode" .................................................................... 14
Energy saving function "Holiday program" ............................................ 14
■Setting "Holiday program" ................................................................... 14
■Ending "Holiday program" ................................................................... 15
Heating curve ......................................................................................... 15
■Setting the heating curve via the questionnaire .................................. 15
■Setting the heating curve via standard mode ..................................... 16
■Setting the heating curve via contractor mode ................................... 17
■For technically-minded system users ................................................. 19
4. DHW heating Settings for DHW heating ...................................................................... 20
DHW temperatures ................................................................................ 20
■Changing the set DHW temperature .................................................. 20
Setting a time program .......................................................................... 20
Automatic time program ......................................................................... 20
Individual time program ......................................................................... 21
Operating status for DHW heating ......................................................... 21
■Starting DHW mode ............................................................................ 21
■Stopping DHW mode .......................................................................... 22
5. Boiler operation Boiler menu ............................................................................................ 23
■Displaying the boiler overview ............................................................ 23
■Calling up the overview ...................................................................... 23
■Calling up a detailed screen ............................................................... 23
■Symbols in the boiler operation menu ................................................ 24
■Calling up menu points ....................................................................... 24
Index
Index
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6. Local heating network
supply
Local heating network supply ................................................................ 25
Changing the max. flow temperature of the local heating network sup-
ply .......................................................................................................... 25
7. Solar energy ................................................................................................................ 26
8. Cascade ................................................................................................................ 27
9. Further adjustments Display settings ...................................................................................... 30
■Setting the background brightness ..................................................... 30
■Setting the brightness of the display in standby mode ....................... 30
■Switching off the display in standby mode .......................................... 30
■Briefly deactivating the display ........................................................... 31
■Changing the delay in standby mode ................................................. 31
■Changing the delay for the idle screen ............................................... 32
Setting the time and date ....................................................................... 32
Setting the language .............................................................................. 32
Reinstating factory settings .................................................................... 32
Changing network settings .................................................................... 33
Activating visualisation ........................................................................... 33
10. Calling up information Calling up information ............................................................................ 34
Calling up fault messages ...................................................................... 34
Calling up an acknowledged fault message .......................................... 34
11. Appendix Terminology ........................................................................................... 35
Information on disposal .......................................................................... 38
■Disposal of packaging ........................................................................ 38
■Final decommissioning and disposal of the heating system ............... 39
12. Keyword index ................................................................................................................ 40
Index
Index (cont.)
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Symbol Meaning
Reference to other document containing
further information
1.
Step in a diagram:
The numbers correspond to the order in
which the steps are carried out.
Warning of material losses and environ-
mental pollution
Live electrical area
Pay particular attention.
■Component must audibly click into place.
or
■Acoustic signal
■Fit new component.
or
■In conjunction with a tool: Clean the sur-
face.
Dispose of component correctly.
Dispose of component at a suitable collec-
tion point. Do not dispose of component in
domestic waste.
Terminology
To provide you with a better understanding of the func-
tions of your Vitotrol control unit, some terminology is
explained.
In the operating instructions these points are identified
as follows:
Further information can be found in chapter
"Terminology" in the appendix.
Intended use
The appliance is intended solely for installation and
operation in sealed unvented heating systems that
comply with EN 12828, with due attention paid to the
associated installation, service and operating instruc-
tions.
Depending on the version, the appliance can only be
used for the following purposes:
■Central heating
■DHW heating
The range of functions can be extended with additional
components and accessories.
Introductory information
Symbols
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Intended use presupposes that a fixed installation in
conjunction with permissible, system-specific compo-
nents has been carried out.
Commercial or industrial usage for a purpose other
than central heating or DHW heating shall be deemed
inappropriate.
Any usage beyond this must be approved by the man-
ufacturer in each individual case.
Incorrect use or operation of the appliance (e.g. the
appliance being opened by the system user) is prohibi-
ted and will result in an exclusion of liability. Incorrect
use also occurs if the components in the heating sys-
tem are modified from their intended function.
Note
This appliance is intended exclusively for domestic
use. The appliance can also be operated safely by
untrained persons.
Commissioning
Your heating contractor must carry out the commis-
sioning and matching of the control unit to local and
structural conditions and must also provide training in
how to operate the system.
The Vitotrol 350-C can control up to 20 different cir-
cuits. At the factory these circuits are each designated
as a "Regulated circuit". We recommend you
rename these circuits during commissioning to suit
local conditions.
Note
These operating instructions also describe functions
that are only available for certain boilers, or only in
conjunction with accessories. These functions are not
specifically identified.
For questions relating to the available range of func-
tions and accessories for your boiler and your heating
system, check with your heating contractor.
Permissible ambient temperature
Incorrect ambient conditions can result in damage to
the control unit and put safe operation at risk.
Observe the installation and service instructions
of the control unit.
Permissible ambient temperature for Vitotrol 350-C:
■Storage: -25 °C to 60 °C
■Operation: 0 °C to 40 °C
Energy saving tips
Use the adjustment options offered by your boiler con-
trol unit:
■For central heating, select the operating program
that meets your current requirements:
–For brief periods of absence (a few hours,
for example when out shopping), select "Economy
mode"
The room temperature is reduced for as long as
economy mode is active.
–If you are going away for longer periods, select
"Holiday program".
Central heating is automatically switched off for as
long as the holiday program is active.
–If you have no need to heat your home or provide
DHW for a prolonged period, switch off heating
operation for the respective heating circuits and
switch off DHW heating.
■Do not set the temperature inside the DHW cylinder
too high.
Introductory information
Intended use (cont.)
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Central heating
■Standard room temperature ("Set room tempera-
ture")
You can select your individual preferred temperature
at any time in the standard menu.
■Preferred heating circuit
If your heating system consists of several heating cir-
cuits, you can make any important adjustments for
your preferred heating circuit directly via the stand-
ard menu.
■Time program
Make use of the time program. In the time program
you can set time phases with different room temper-
atures, for example different temperatures for day
and night time.
■Heating curve
The heating curve enables you to individually adjust
the heating system to the actual heat demand in your
home. If set correctly, your preferred temperature will
be achieved all year round.
■"Party mode"
Select "Party mode" if you want to heat your home
to a temperature that is different from that dictated by
the time program.
Example: Late in the evening, the reduced room
temperature is set by the time program. If your visi-
tors stay a little longer, you can change over to a
higher temperature.
DHW heating
■Time program
Use the time program for DHW heating.
Introductory information
Tips for greater comfort
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Programming unit default display
Fig. 1
ACalls up the menu
BSet regulated circuit
CDate and time
DHeader
ESet room temperature
FButtons for adjusting temperature
GFooter
HCurrent room temperature
KFault message
LCurrent outside temperature
MDisplay, for example central heating with standard
room temperature
NButtons for operating program
Highlighted frame = active operating program
The Vitotrol 350-C programming unit is equipped with
a touch sensitive display. To make settings and call up
information, tap the on-screen buttons.
Symbols in the display
Symbols are not permanently displayed but appear
according to system version and operating state.
Buttons:
+Raises the temperature value.
–Lowers the temperature value.
"Menu" Calls up the menu.
"Regulated circuit 1" Selects the required group.
"Heating circuit 1" Selects the required group.
"OK" Confirms your selection or set-
ting.
Returns you to the default dis-
play.
Takes you back to the previous
step in the menu or cancels a
setting that has been started.
/ / / Scrolls through the menu or
adjusts values.
Displays:
Boiler and DHW cylinder frost protection monitoring
Central heating with standard room temperature
Central heating with reduced room temperature
In conjunction with a solar thermal system:
Solar circuit pump running
Messages:
Fault message
Screensaver
The screensaver is enabled if no adjustments are
made on the programming unit for a few minutes. The
display brightness is reduced.
The following are shown:
■Date
■Time
■Outside temperature
■Room temperature of the default display heating cir-
cuit
To call up the default display screen (see page 9), tap
the display.
Operation
Controlsand symbols
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Settings made via the default display
Fig. 2
In the default display, you can call up and adjust the settings for the set regulated circuit as follows:
■Heating mode
"Heating mode is ON"/"Heating mode is OFF"
■Energy saving function
"Economy mode is ON"/"Economy mode is OFF"
■Comfort function
"Party mode": You can set the temperature for party mode.
See chapter "Setting the operating program", page 11
Tap on .
Heating is ON when the operating program has a highlighted frame.
Note
and are only shown when the heating is ON.
Settings made via the menu
Note
Subject to the features of your heating system, not all of the information listed here may be available to call up.
On the default display, tap "Menu". You can call up and adjust the following settings:
Fig. 3 Fig. 4
■"Central Heating" see page 11
■"DHW" see page 20
■"Local heating network supply" see page 25
■"Solar energy" see page 26
■"Boiler operation" see page 23
■"Information" see page 34
■"Settings" see page 30
Operation
Menu navigation
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If you require central heating, check the following
points:
■Have you selected the heating circuit?
For setting see chapter "Heating circuit selection".
■Have you set the required room temperature?
■Have you set the correct operating program?
■Have you set the required time program?
Heating circuit selection
If required, the heating of your rooms can be split over
several heating circuits.
■In the case of heating systems with several heating
circuits, for all central heating settings, first select the
heating circuit for which you want to make a change.
■This selection is not available in heating systems
with only one heating circuit.
If you or your heating contractor have renamed the
heating circuits (e.g. to "Apartment" or similar), that
name is shown in place of "Heating circuit 1".
Setting temperatures for central heating
Setting the room temperature for standard heating mode
Default display
1. "Menu"
2. "Central Heating"
3. Select the required heating circuit.
Fig. 5
4. "Set temperature, day"
5. +/- for the required temperature
6. Press "OK" to confirm
Setting the room temperature for reduced heating mode (night setback)
Default display
1. "Menu"
2. "Central Heating"
3. Select the required heating circuit.
4. "Reduced room temperature"
5. +/- for the required temperature
6. Press "OK" to confirm
Operating program
Further information can be found in chapter
"Terminology" in the appendix.
Setting the operating program
Central heating
Central heating settings
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Default display
1. "Menu"
2. "Central Heating"
3. Select the required heating circuit.
4. "Op mode"
Fig. 6
5. Select the required operating program:
■è for heating mode
■â for economy mode
■Þ for party mode
An operating program with a highlighted frame is
already enabled.
Note
and are only shown when the heating is ON.
Note
Tapping
è
again shuts down heating mode.
Time program
Further information can be found in chapter
"Terminology" in the appendix.
Setting a time program
The times at which the heating circuit delivers central
heating with standard or reduced room temperature
depends on the setting of the switching times for the
relevant day (4 possible time phases).
■If one or more time phases are set, central heating
with standard room temperature is active during
those times.
■If no time phases are set, central heating is carried
out to the reduced room temperature for the whole
day.
■For central heating, up to 4 changes between stand-
ard and reduced room temperature can be program-
med per day (4 time phases).
■For weekdays, time phase ! has been factory-set
from 06:00 to 22:00 h. During this time your home is
heated to the standard room temperature.
■You can set individual switching times for each
weekday.
When setting switching times, note that your heating
system requires some time to heat the interior to the
required temperature.
Note
For the period between the specified switching times,
the relevant heating circuit is regulated to the standard
room temperature.
Setting switching times
Default display
1. "Menu"
2. "Central Heating"
3. Select the required heating circuit.
Central heating
Operating program (cont.)
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4. "Heating time program"
Fig. 7
5. Select any day.
Fig. 8
6. Select the time phase you want to change.
Fig. 9
7. Set the required switching times.
8. Press "OK" to confirm
9. Set further switching times or tap "OK" to confirm.
Fig. 10
10. Select the days of the week when the new switch-
ing times should apply.
11. Press "OK" to confirm
Note
The switching times will be adopted exclusively for
those days which have been checked.
Comfort function "Party mode"
Setting "Party mode"
Note
You can set party mode directly for the regulated cir-
cuit set in the default display.
Default display
1. "Menu"
2. "Central Heating"
3. Select the required regulated circuit.
4. "Op mode"
An operating program with a highlighted frame is
already enabled.
5. If "Party mode" is not enabled, tap "Party mode".
Note
Heating mode must be switched on in order to
display "Party mode" for selection.
6. Set the required room temperature for "Party
mode".
7. Press "OK" to confirm
Central heating
Time program (cont.)
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Ending "Party mode"
■Party mode ends automatically after 8 hours.
or
■Party mode ends automatically on changeover to the
"Standard" operating status in accordance with the
time program.
or
Default display
1. "Menu"
2. "Central Heating"
3. Select the required regulated circuit.
4. "Op mode"
An operating program with a highlighted frame is
already enabled.
5. If "Party mode" is enabled, tap "Party mode".
Energy saving function "Economy mode"
Setting "Economy mode"
Default display
1. "Menu"
2. "Central Heating"
3. Select the required regulated circuit.
4. "Op mode"
An operating program with a highlighted frame is
already enabled.
5. If "Economy mode" is not enabled, tap "Economy
mode".
Note
Heating mode must be switched on in order to
display "Economy mode" for selection.
6. "OK" to confirm or wait a few seconds.
Ending "Economy mode"
■Economy mode ends automatically on changeover to
the "Reduced" operating status in accordance with
the time program.
or
Default display
1. "Menu"
2. "Central Heating"
3. Select the required regulated circuit.
4. "Op mode"
An operating program with a highlighted frame is
already enabled.
5. If "Economy mode" is enabled, tap "Economy
mode".
6. "OK" to confirm or wait a few seconds.
Energy saving function "Holiday program"
Setting "Holiday program"
The holiday program starts at 00:00 h the day after the
departure date. The holiday program ends at 00:00 h
on the return date. On the day of departure and the
day of return, the set time program is enabled.
Default display
1. "Menu"
2. "Central Heating"
3. Select the required regulated circuit.
4. "Holiday program"
Central heating
Comfort function "Party mode" (cont.)
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5. Set the required departure and return dates.
Fig. 11
6. Press "OK" to confirm
The holiday program has the following effect:
The rooms are heated to the set reduced room tem-
perature (see page 11).
Ending "Holiday program"
Default display
1. "Menu"
2. "Central Heating"
3. Select the required regulated circuit.
4. "Holiday program"
5. "End holiday program"
6. Press "OK" to confirm
Heating curve
■If the room temperature does not meet your requirements for a prolonged period of time you can alter the heat-
ing characteristics.
■Please observe the modified heating characteristics over several days (if possible, wait for a major change in
the weather) before making further adjustments.
You can adjust the heating curve in 3 different ways:
■Via the questionnaire
■Via standard mode
■Via contractor mode
Setting the heating curve via the questionnaire
Default display
1. "Menu"
2. "Central Heating"
3. Select the required heating circuit.
Central heating
Energy saving function "Holiday program" (cont.)
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4. "Temperature level diagram"
Fig. 12
5. "Temp level questionnaire"
Fig. 13
6. Make the required corrections.
7. Press "OK" to confirm
Note
Your input automatically changes the heating curve.
Setting the heating curve via standard mode
Default display
1. "Menu"
2. "Central Heating"
3. Select the required heating circuit.
4. "Temperature level diagram"
Fig. 14
Central heating
Heating curve (cont.)
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5. "Temperature level diagram"
Fig. 15
6. Tap the required temperature button.
Fig. 16
7. Correct the temperature with the +/- buttons.
8. Press "OK" to confirm
Setting the heating curve via contractor mode
Default display
1. "Menu"
2. "Central Heating"
3. Select the required heating circuit.
4. "Temperature level diagram"
Fig. 17
Central heating
Heating curve (cont.)
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5. "Temperature level diagram"
Fig. 18
6. "Contractor mode"
7. Tap the "Slope" or "Level" buttons.
Fig. 19
8. Correct the values with the +/- buttons.
9. Press "OK" to confirm
■You influence the heating characteristics by changing the slope or level of the heating curve.
Changing slope and level
Please use the following table as an aid to making adjustments:
Heating characteristics Steps to take Example
The living space is too cold during
winter.
Set the heating curve slope to the next high-
er value (e.g. 1.5).
Slope 1.5
Level 0 K
The living space is too hot during win-
ter.
Set the heating curve slope to the next lower
value (e.g. 1.3).
Slope 1.3
Level 0 K
The living space is too cold during
spring/autumn and during winter.
Set the heating curve level to a higher value
(e.g. +3).
Slope 1.4
Level 3 K
The living space is too hot during
spring/autumn and during winter.
Set the heating curve level to a lower value
(e.g. −3).
Slope 1.4
Level -3 K
Central heating
Heating curve (cont.)
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Heating characteristics Steps to take Example
The living space is too cold during
spring/autumn, but warm enough dur-
ing winter.
Adjust the heating curve slope to the next
lower value and the level to a higher value.
Slope 1.3
Level 3 K
The living space is too hot during
spring/autumn, but warm enough dur-
ing winter.
Set the heating curve slope to the next high-
er value and the level to a lower value.
Slope 1.5
Level -3 K
Note
Setting the slope or level too high or too low will not result in damage to your heating system.
For technically-minded system users
■Heating curves illustrate the relationship between the outside temperature and the flow temperature. To put it
simply: The lower the outside temperature, the higher the flow temperature.
The heating curves shown apply with the following settings:
■Heating curve level = 0
A different setting for the level will shift the curves in parallel in a vertical direction.
■Standard room temperature = approx. 20 °C
In the delivered condition, the control unit has been programmed as follows:
■Slope = 1.4
■Level = 0
0.2
Outside temperature in °C
Boiler water or flow temperature in °C
Slope
2.4 2.6 2.8 3.0 3.2 3.4
90
80
70
60
50
40
30
0 -10 -2010
A
B
2.0 2.2
Set room temperature in °C
35 30 25 20 15 10 5
0.4
0.6
0.8
1.0
1.2
1.4
-30
1.8 1.6
C
-14
Fig. 20
Example for an outside temperature of -14 °C:
AUnderfloor heating system, slope 0.2 to 0.8
BLow temperature heating system, slope 0.8 to 1.6
CHeating system with a boiler water temperature above 75 °C, slope 1.6 to 2.0
Central heating
Heating curve (cont.)
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If you want DHW heating, check the following points:
■Have you selected the required group?
■Have you set the required set DHW temperature?
■Have you set the required time program?
DHW temperatures
Changing the set DHW temperature
Factory setting: 60 °C
Default display
1. "Menu"
2. "DHW"
3. Select the required group if there are several.
4. "Temperature"
5. Set the required value.
6. Press "OK" to confirm
Setting a time program
Further information can be found in chapter
"Terminology" in the appendix.
Factory setting: One time phase from 00:00 to 24:00 h
for every day of the week with operating status "Top".
You can set time programs in 2 different ways:
■Via the automatic time program
■Via the individual time program
Note
■Between the time phases, DHW is not heated; only
frost protection for the DHW cylinder is active.
■When inputting settings, please observe the follow-
ing: Your heating system needs a little time to heat
up the DHW cylinder to the required temperature.
Select correspondingly earlier start and stop times.
Automatic time program
Default display
1. "Menu"
2. "DHW"
3. Select the required group if there are several.
4. "DHW time program"
Fig. 21
5. Select "Time program Automatic system".
The message "Automatic DHW heating accep-
ted" is shown.
DHW heating
Settings for DHW heating
5778 774 GB