Viessmann GC1 Guide

VITOTRONIC 100, GC1
VITOTRONIC 300-K, MW1S
Operating Instructions
and User’s Information Manual
for use by heating contractor
Vitotronic 100, Model GC1
Digital boiler control unit
Vitotronic 300-K, Model MW1S
Outdoor-reset logic digital cascade control, for installation in Custom Control Panel
Certified as a component part
of Viessmann boilers only
Please file in Service Binder
558 75 v . 0/20 0

Introductory information
2
For your safety
Please follow these safety instructions closely to avoid the risk of injury to persons and damage to property.
f you smell gas
Don’t smoke! Don’t use naked
flames or cause sparks (e.g. by
switching lights or electrical
appliances on and off)
Open windows and doors
Close the gas shut-off valve
Inform your heating engineers/service
contractors from outside the building
Observe the safety regulations of
your gas supply company (see gas
meter) and those of your heating
engineers (see start-up or instruction
report).
n emergencies
Immediately switch off the power
supply, e.g. at the separate fuse or
power supply disconnect switch
(unless there is a smell of gas).
Close the shut-off valves in the oil
pipes or close the gas shut-off valve,
whichever applicable.
Use suitable extinguishers in the
event of fire.
Work on the equipment
Installation, initial start-up, maintenance
and repairs must be carried out by a
competent person (heating engineer/
service contractor).
Before work is undertaken on the
equipment/heating system, switch off
the power supply voltage (e.g. at the
separate fuse or power supply electrical
isolator switch) and take steps to prevent
it from being switched on again.
Gas-fired systems: Also close the gas
shut-off valve and make secure to
prevent unauthorized use.
nstallation of additional components
The installation of additional
components which have not been
tested together with the boiler can
adversely affect the function and
performance of the boiler.
Our warranty does not cover and we
accept no liability for damage
attributable to the installation of
such components.
Boiler room conditions
Do not use a room in which the
airis polluted by halogenated
hydro-carbons (e.g. as contained
in aerosols, paints, solvents and
cleaning agents)
Do not use a room subject to high
levels of dust
Do not use a room subject to
permanently high humidity
The room should be frost-protected
Max. ambient temperature 35 °C.
Provide good ventilation and do not
close or obstruct vents (if installed).
This symbol indicates a
reference to other
instructions which must
be observed.
This header denotes special
instructions which apply to
the use of the Vitotronic 100,
G 1 in a multi-boiler system.
The main controls
The settings required for operating your heating system are made on the
Vitotronic 00, GC of each boiler and on the Vitotronic 300-K, MW S.
If you system is equipped with remote controls, you can also use the remote
controls for some of the settings
See operating instructions for the remote control
The control unit is behind the hinged cover. The hinged cover is opened by
pulling the top gently downwards towards you.
You must close the hinged cover again after use.
558 75 v .
Multi-
boiler
system

Index
3
Page
Useful tips ntroductory information
For your safety 2 .....................................................................................................
nstructions in brief Ready for operation
The main controls 2 ...............................................................................................
Overview of controls and indicators 4 ...........................................................
Vitotronic 00, GC
Vitotronic 300-K, MW S
Selecting the heating circuit - before every setting and scanning
operation (Vitotronic 300-K, MW S) 6 ..........................................................
Your heating system is preset... 7 ...................................................................
Selecting the heating program (winter, summer) 8 ...................................
Changing the room temperature (Vitotronic 300-K, MW S) 0 ...........
Reference guide Switching on and off
Starting up the heating system 2 .....................................................................
Shutting down the heating system 2 .............................................................
Settings
Changing the boiler water temperature (Vitotronic 00, GC ) 3 .......
Selecting the time programs (Vitotronic 300-K, MW S)
Setting the energy saving mode for the holiday period
(Vitotronic 300-K, MW S)
Resetting the date and time (Vitotronic 300-K, MW S)
Selecting the language (Vitotronic 300-K, MW S)
Boiler sequence selection control (Vitotronic 300-K, MW S)
Changing the heating pattern (Vitotronic 300-K, MW S)
Scanning
Scanning temperatures and operating status information 26
.................
Vitotronic 00, GC
Vitotronic 300-K, MW S
nformation Troubleshooting guide
Diagnosis and correction 29 .................................................................................
Vitotronic 00, GC 29 ......................................................................................
Vitotronic 300-K, MW S 3 .............................................................................
558 75 v .

Ready for operation
4
Overview of controls and indicators Vitotronic 100, GC1
Manual override
Changing the boiler water temperature(without
function in multi-boiler system)
Changing the domestic hot water
temperature
(without function in multi-boiler system)
Value selector buttons
Information
Confirmation button
Factory settings (see below)
Display window
Heating program selector buttons
wwithout function in multi-boiler system
Adjustable high limit
Manual reset fixed high limit
Power on/off switch
Fuse F , F2
TÜV (for service purposes only)
Operating status indicator (green)
Fault indicator (red)
Factory settings
Press this button to reset all altered
values to their factory settings. Please
note that all altered values are reset
to the factory settings.
Flashing data
Data flashing in the display window
means that new settings can be
entered.
Other display symbols
(These are not displayed continuously,
but appear according to system type
and operating status)
8Digital display of the
corresponding value
°C Unit of measurement for
temperature values
hUnit of measurement for
display of burner hours run
UFault message
rCentral heating ON
rp Displayed when output sÖ is
activated
ABurner ON
wDomestic hot water heating
released
wp DHW pump (circulation pump
for heating the DHW tank) ON
| Scan hours run
st stage burner
|| Scan hours run
2nd stage burner
||| Scan number of burner starts
558 75 v .
TÜV

Ready for operation
5
Overview of controls and indicators Vitotronic 300-K
Heating circuit selector buttons
(page 6)
Display window
Normal room temperature (page 9)
Heating programs (page 8)
Energy saving mode (page )
Party mode (page 0)
Hinged cover of programming unit
Time program for central heating
(page 3)
Time program for domestic hot water
heating (page 3)
Other symbols (page 6)
Time program for DHW re-circulation
pump (page 3)
Holiday program (page 9)
Information (page 2 )
Confirmation
Factory settings (page 7)
Setting buttons
Domestic hot water temperature
(page 8)
Reduced room temperature (page 9)
Time/date
Heating curve shift (page 23)
Heating curve slope (page 23)
Hinged cover of propgramming unit
558 75 v .
Boiler sequence
1-23-4
Boiler sequence
1-23-4

Ready for operationReady for operation
6
Overview of controls and indicators (continued) Vitotronic 300-K, MW1S
Adjustment of the display window
contrast
Open the hinged cover on the
prgramming unit, and press and, at
the same time, adjust the contrast with
the or button.
Factory settings
Press this button to reset all altered
values to their factory settings. Please
note that all altered values are reset to
the factory settings.
Flashing data
Data flashing in the display window
means that new settings can be
entered.
Basic display
The basic display of the Vitotronic
300-K, MW S shows the boiler
sequence. The display reverts to
showing the boiler sequence after
each setting is made on the control
unit.
Other display symbols
(These are not displayed
continuously, but appear according
to system type and operating status)
eRisk of freezing
sCentral heating with normal
room temperature
mCentral heating with reduced
room temperature
wDomestic hot water heating,
DHW pump ON
pHeating circuit pump ON
U
UU
UFault message
VMixing valve open
vMixing valve closed
Select the heating ciruit - before every setting and scanning operation Vitotronic 300-K, MW1S
On heating systems with only one heating circuit, you can start making all
settings immediately.
On heating systems with two or three heating circuits, the corresponding heating
circuit must be selected before carrying out each setting and scanning operation.
Heating circuit selector button :Heating circuit 1 (system circuit)
Heating circuit selector button :Heating circuit 2 with mixing valve
Heating circuit selector button 3:Heating circuit 3 with mixing valve
The heating circuits are individually labelled by your heating contractor.
Press or or 3; the following
buttons are illuminated:
the heating ciruit selector button
the current heating program
(see page 8)
the party or energy saving mode,
if selected (see page 0)
You can now start making the settings
and adjustments for the selected
heating circuit.
If you have not selected the
required heating circuit before
starting to carry out the settings,
the following instruction appears
in the display window:
“First select button , 2 or 3.”
Please note:
If no further settings are made, the
illumination of the the buttons is
extinguished after a short time.
558 75 v .
Boiler sequence
1-23-4
Boiler temperature
Mo

Ready for operation
7
Your heating system is preset ...
The control units are preset in the factory to a standard operating mode.
The heating system, is therefore ready for operation.
You can change the factory settings to suit your individual preferences.
Vitotronic 100, GC1
Heating Program
The heating program is set for
“Central heating and domestic hot
water”, i.e. heating takes place,
controlled via the Vitotronic 300-K, MW S.
Vitotronic 300-K, MW1S


Date and time (CET)
The date and time are preset in the
factory. Resetting for winter/summer
time takes place automatically.


Heating program
The heating program is set for
“Central heating and domestic hot
water”, i.e. central heating and
domestic hot water heating
(if a DHW tank is installed)
take place, in accordance with
the time programs.


Time program
Between 6.00 and 22.00 hrs, central
heating takes place with the normal
room temperature and, between 5:30
and 22.00 hrs, domestic hot water
heating (if a DHW tank is installed).
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Ready for operation
8
Selecting the heating program (winter, summer) Vitotronic 300-K, MW1S
Vitotronic 100, GC1
Select the required heating program
with the , or button.
When pressed, the corresponding
button is illumintaed
Central heating and domestic hot water
The boiler is available to the heating
system and is switched on according
to demand and in accordance with
the boiler sequence
Frost protection of the boiler
Domestic hot water only
Without function
The domestic hot water supply
is always controlled via the
Vitotronic 300-K, MW1S
(see below)
Standby operation
The boiler is switched off and is
no longer availble to the Vitotronic
300-K, MW S (i.e. drops out of
the boiler sequence)
Frost protection of the boiler
Vitotronic 300-K, MW1S
.Press the heating circuit slelctor
button; the button is illuminated
2.Select the heating program with
the , or button.
Central heating and domestic hot water
Central heating with alternating
normal and reduced room
temperature (frost protection)
according to the selected time
program.
Domestic hot water supply (if a
DHW cylinder is installed) and DHW
circulation pump (if installed) ON
according to selected time program
Frost protection of the DHW cylinder
Domestic hot water only
No central heating
Domestic hot water supply (if a
DHW cylinder is installed) and DHW
circulation pump (if installed) ON
according to selected time program
Frost protection of the DHW cylinder
Standby operation
No central heating
No DHW supply
Please note:
The circulation pump is switched
on for a short time every 24 hours
to prevent them from seizing up.
The selected heating program
appears in the display window
for a short time.
Example
For the winter transitionary periods.
Please note:
When the button is lit, the “ ”
symbol appears in the display
window during central heating with
the normal room temperature; the
“ ” symbol is illuminated during
central heating with a reduced room
temperature higher than 3 ° / 37 °F
Example
For the summer.
Please note:
DHW cylinder is connected
“without function” is displayed.
Please note:
The circulation pumps are switched
on for a short time every 24 hours
to prevent them from seizing up.
558 75 v .

Ready for operation
9
Selecting the heating program (winter, summer) Vitotronic 300-K, MW1S
In the ” entral heating and domestic hot water” heating program, central heating
takes place with alternating ”normal room temperature” and ”reduced room
temperature” according to the selected time program.
You can set the required room temperature as follows:
To change the ”normal room temperature” (day temperature)
Normal room temp.
ºC
Factory setting:
20 ºC / 68 ºF from 06:00 to 22:00 hrs.
The ”normal room temperature” can be
set between 3 and 37 ºC /
37 and 99 ºF.
1.Press the heating circuit selector
button; the button is illuminated.
2.Set the required temperature value
with the “ts” selector knob.
The display changes after a short
time and shows the boiler sequence.
To change the ”reduced room temperature” (night temperature)
Reduced room temp.
ºC
Factory setting:
frost protection 3 ºC / 37 ºF from
22.00 to 6.00 hrs.
The “reduced room temperature” can
be set between 4 and 37 ºC / 39 and
99 ºF.
1.Open the hinged cover on the
programming unit.
2.Press the heating circuit selector
button; the button is illuminated.
3. Press ; the previous
temperature setting flashes
in the display window.
4. / Press the / button
until the required
temperature value appears.
5. Confirm by pressing ;
the temperature value
stops flashing and is stored.
The display changes and
shows boiler sequence.
6. Close the hinged cover on the
programming unit.
Please note:
If the temperature value 3 ºC /
37 ºF is selected ,
“frost protection” appears in the
display window.
558 75 v .

Ready for operation
10
Setting the party mode Vitotronic 300-K, MW1S
Switch on the party mode when you require central heating and domestic hot
water (if a DHW tank is installed) for a short time independently of the preset
heating and time program.
To activate the party mode
Party mode
ºC
1. Open the hinged cover on the
programming unit.
2. Press the heating circuit selector
button; the button is illuminated.
3. Press ; the button is
illuminated, the party mode
display appears in the display
window and the party
temperature value flashes.
4. To change the party temperature:
/ Press the / button until
the required temperature
value appears.
5. Confirm by pressing ;
the temperature value stops
flashing and is stored.
The display changes and
shows the boiler
temperature.
6. Close the hinged cover on the
programming unit.
To cancel the party mode
The party mode is cancelled the
next time the preset heating program
switches automatically to central
heating with the ”normal room
temperature”.
If you want to cancel the party mode
immediately, press the heating circuit
selector button and the button
again; the button is no longer
illuminated.
The light on the button turns off
after approx. 1 minute. The party
mode is still active.
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Ready for operation
11
Activating the energy saving mode Vitotronic 300-K, MW1S
The energy saving mode is only possible in the ”rw“ heating program. Switch
on the energy saving mode when you require particularly economic central
heating for a short time. In the energy saving mode the preset room temperature
is automatically lowered.
Energy saving mode
To activate the energy saving mode
1. Press the heating circuit selector
button; the button is illuminated.
2. Press ; the button is
illuminated, the energy saving
mode display appears in the
display window for a short
time.
To cancel the energy saving mode
The energy saving mode is cancelled
automatically the next time the
preset heating program switches to
central heating with the ”reduced
room temperature”.
If you want to cancel the energy
saving mode immediately, press the
heating circuit selector button and
the button again; the button is
no longer illuminated.
The light on the button turns off
after approx. 1 minute. The
energy saving mode is still active.
558 75 v .

Switching on and offSwitching on and off
12
Starting up the heating system Vitotronic 300-K, MW1S
The initial start-up and matching of the control unit to local conditions and the
structural characteristics of the building must be carried out by your heating
contractor.
1. Check the pressure of the heating
system on the manometer.
If the needle is below the red
marker, the system pressure is too
low – in which case add more water
or contact your heating contractor.
2. Open the shut-off valves in the oil
pipes (at the boiler) or open the gas
shut-off valve, whichever applicable.
3. Switch on the power supply voltage,
e.g. at the separate fuse or a power
supply disconnect switch.
4. Switch on the heating system
on/off switch ”8”; the operating
status is indicated by the green lamp
and, after a short time, the boiler
temperature appears in the display
window.
Your heating system and, is
installed, the remote controls
are now ready for operation.
Shutting down the heating system Vitotronic 300-K, MW1S
If you do not want to use your heating system temporarily, select standby
operation on the Vitotronic 300-K, MW1S (see “Selecting the heating program”,
page 6).
If you want to switch off only one boiler in the heating system, select standby
operation on the corresponding Vitotronic 100, G 1.
If you do not want to use your heating system for a long period (several months),
you should shut down the system.
We advise you to contact your heating contractor before and after shutting down
the heating system for long periods. Your heating contractor will take any
necessary action, e.g. for frost protection of the system or to safeguard the
heat exchange surfaces.
1. Switch off the heating system
on/off switch ”8” on all control
units.
The green lamp (operating status
indicator) goes out.
2. Close the shut-off valves in the oil
pipes (at the tank and filter) or close
the gas shut-off valve, whichever
applicable.
3. Switch off the main power supply
e.g. at the separate fuse or a main
electrical isolator switch. The power
supply to the system is now
switched off. There is no frost
protection.
Please note:
The settings of the control units
remain intact
558 75 v .558 75 v .

SettingsSettings
13
Changing the boiler water temperature Vitotronic 100, GC1
In a multi-boiler system with the Vitotronic 300-K, MW1S, the boiler water
temperature is determined by the Vitotronic 300-K, MW1S for all boiler control
units. It is not possible to make the setting on the Vitotronic 100, G 1.
Selecting the time programs Vitotronic 300-K, MW1S
You can select time programs for central heating, domestic hot water (if a DHW
tank is installed) and the DHW re-circulation pump (if installed). The DHW
re-circulation pump ensures that hot water is available at the taps when required.
A time program consists of 4 time phases, i.e.
 the central heating can be switched up to 4 times per day to and fro between
the ”normal room temperature” and the ”reduced room temperature”.
the domestic hot water supply and DHW re-circulation pump can be switched
on and off up to 4 times per day.
Time phase 1 is preset in the factory for all days of the week, i.e. during this
time central heating takes place with the normal room temperature, domestic
hot water heating takes place and the DHW re-circulation pump is switched on.
The following buttons are assigned to the time programs:
Button Time program for Factory setting
ur central heating normal room temperature:
6.00 to 22.00 hrs
uw domestic hot water ON:
5.30 to 22.00 hrs
up DHW re-circulation pump ON:
5.30 to 22.00 hrs
You can set identical time programs for all days of the week or individual time
programs for each day of the week.
When setting the time programs, please take into account the reaction time
of the heating system. Therefore choose correspondingly earlier starting and
finishing times.
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Settings
14
Selecting the time programs (continued) Vitotronic 300-K, MW1S
Changing and scanning the time program for central heating
Time Prog. Central Htg.
-7
11. Open the hinged cover on the
programming unit.
12. Press the heating circuit selector
button; the button is illuminated.
13. Press ; the ”Central
heating time program”
display appears in the
display window.
14. / Press / until one of
the following displays
appears in the display
window:
”1-7” if you wish to set
identical time phases for
all days of the week.
If you wish to exit the time
program setting mode, press
again (see page 14).
Please note:
If different time phases are set for
individual days of the week and
you would like to set the same time
phases for all days again, press
when the display ”1-7”is showing.
All time phases are reset to their
factory settings (see page 4).
Time Prog. Central Htg.
Mo
or
Mo”,”Tu” etc. if you
wish to set different time
phases for the displayed
day of the week.
15. Press to confirm; the
display changes to ”Central
heating time phase 1”.
Press to skip a time phase.
16. Press ; the display
changes to ”Central heating
phase 1 ON”.
17. / Press / until the
required starting time of
the central heating phase
appears.
18. Press to confirm; the
display changes to ”Central
heating phase 1 OFF”.
19. / Press / until the
required finishing time of
the central heating phase
appears.
10. Press to confirm; the
display changes to ”Central
heating phase 2 ON”.
11. To set the start and end of central
heating phases “2” to “4”, follow
the procedure described in points 7
to 0.
12. Close the hinged cover on the
programming unit.
After you have confirmed the
finishing timer of central heating
phase 4 with , the display
changes and shows the boiler
sequence.
558 75 v .

Settings
15
Selecting the time programs (continued) Vitotronic 300-K, MW1S
Changing and scanning the time program for central heating (continued)
To exit the setting mode at any time
1. Press ; the display
changes to ”Exit? Yes”.
2. Press to confirm; the
display changes and shows
the boiler temperature.
1
-7
To scan the time phases
Follow the procedure described on
page 3, but without using the
and buttons.
The time phases at a glance
1. Open the hinged cover on the
programming unit.
2. Press the heating circuit selector
button; the button is illuminated.
3. Press and simultaneously;
the preset time phases appear on
a time slot graphic.
4. Close the hinged cover on the
programming unit.
Central Htg. Phase 2 OFF
-7
To erase the time phases
1. Open the hinged cover on the
programming unit.
2. Press the heating circuit selector
button; the button is illuminated.
3. Press ; the ”Central
heating time program”
display appears in the
display window.
4. Press until the required
”Central heating phase OFF”
appears.
5. Press until the display
”– – : – –” appears for the
finishing time.
6. Press to confirm until the
display changes and shows
the boiler temperature.
7. Close the hinged cover on the
programming unit.
558 75 v .
036 12 159 18 21 24

Settings
16
Selecting the time programs (continued) Vitotronic 300-K, MW1S
Changing and scanning the time program for domestic hot water heating and the DHW re-circulation pump
The automatic mode is selected in the time program for domestic hot water
and the DHW re-circulation pump, i.e. domestic hot water heating takes place
in parallel with the central heating time program, but starts 30 minutes earlier.
The DHW re-circulation pump runs parallel with the domestic hot water time
program.
If you do not require the automatic mode, you can also set individual time
programs.
The following example shows the steps required for setting a time program
for domestic hot water heating. Follow the same steps when setting the time
program for the DHW re-circulation pump.
To select the automatic mode
(if required)
1. Open the hinged cover on the
programming unit.
2. Press the heating circuit selector
button; the button is illuminated.
3. Press ; the ”DHW time
program” display appears
in the display window.
4. / Press / for ”Automa-
tic?” if ”Automatic?” is not
already shown in the display
window.
5. Press to confirm.
To set an individual time program
1. Open the hinged cover on the
programming unit.
2. Press the heating circuit selector
button; the button is illuminated.
3. Press ; the ”DHW time
program” display appears
in the display window.
4. Press / for ” ndivi-
dual?” if ”Individual?” is not
already shown in the display
window.
5. Press to confirm.
If you wish to exit the time
program setting mode, press
again (see page 17).
558 75 v .

Settings
17
Selecting the time programs (continued) Vitotronic 300-K, MW1S
Changing and scanning the time program for domestic hot water heating and the DHW re-circulation pump (continued)
Time prog. DHW
-7
Time prog. DHW
Mo
16. / Press / until one of
the following displays
appears in the display
window:
”1-7” if you wish to set
identical time phases for
all days of the week.
or
”Mo”,”Tu” etc. if you
wish to set different time
phases for the displayed
day of the week.
17. Press to confirm; the
display changes to ”DHW
time phase 1”.
18. Press ; the display
changes to ”DHW phase
1 ON”.
19. / Press / until the
required starting time of
the DHW phase appears.
10. Press to confirm; the
display changes to ”DHW
phase 1 OFF”.
11. / Press / until the
required finishing time of
the DHW phase appears.
12. Press to confirm; the
display changes to ”DHW
phase 2 ON”.
13. To set the start and end of DHW
phases 2 to 4, follow the procedure
described in points 9 to 2.
14. Close the hinged cover on the
programming unit.
To exit the setting mode at any time
1. Press ; the display
changes to ”Exit? Yes”.
2. Press to confirm; the
display changes and
shows the boiler sequence.
Please note:
If different time phases are set for
individual days of the week and
you would like to set the same
time phases for all days again,
press when the display ”1-7”
is showing. All time phases are
reset to their factory settings
(see page 4).
Press to skip a time phase.
After you have confirmed the last
input with , the display changes
and shows the boiler temperature.
558 75 v .

Settings
18
Selecting the time programs (continued) Vitotronic 300-K, MW1S
Changing and scanning the time program for domestic hot water heating and the DHW re-circulation pump (continued)
1
-7
To scan the time phases
Follow the procedure described on
page 5 and 6, but without using
the and buttons.
The time phases at a glance
1. Open the hinged cover on the
programming unit.
2. Press the heating circuit selector
button; the button is illuminated.
3. Press w
ww
wand simultaneously;
the preset time phases appear on
a time slot graphic.
4. Close the hinged cover on the
programming unit.
DHW Phase 2 OFF
-7
To erase the time phases
1. Open the hinged cover on the
programming unit.
2. Press the heating circuit selector
button; the button is illuminated.
3. Press ; the ”DHW time
program” display appears
in the display window.
4. Press until the required
”DHW phase OFF” appears.
5. Press until the display
”– – : – –” appears for the
finishing time.
6. Press to confirm until the
display changes and shows
the boiler temperature.
7. Close the hinged cover on the
programming unit.
Domestic water heating on a one-off basis outside the programmed time
phases
Press twice 2 to 3 seconds apart.
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036 12 159 18 21 24

Settings
19
Changing the domestic hot water temperature Vitotronic 300-K, MW1S
In a multi-boiler system the Vitotronic 100, G 1 is without function.
The domestic hot water temperature is set on the Vitotronic 300-K, MW1S.
Desired DHW temp.
ºC
1. Open the hinged cover on the
programming unit.
12. Press ; the previous
temperature setting flashes
in the display window.
13. / Press the / button
until the required
temperature value appears.
14. Confirm by pressing ;
the temperature value
stops flashing and is stored.
The display changes and
shows the boiler
temperature.
15. Close the hinged cover on the
programming unit.
Setting the energy saving mode for the holiday period Vitotronic 300-K, MW1S
If you want to set the heating system to the minimum energy consumption,
e.g. while you are away on holiday, choose the holiday program or the standby
mode (see ”Selecting the heating program” on page 7).
Holiday program
When the ”rw” heating program
is set (see page 7), central heating
takes place during the holiday
program with the selected ”reduced
room temperature” (see page 8), but
without domestic hot water heating.
The preset time program for central
heating and domestic hot water is
active on the dates of your departure
and return.
When the ”w” heating program is
set, only frost protection of the
heating system takes place during
the holiday program. Domestic hot
water takes place according to the
preset heating program on the dates
of your departure and return.
Please note:
The control unit is set up so that
the holiday program is effective
for all heating circuits.
If you require this to be changed,
please contact your heating
contractor.
558 75 v .

Settings
20
Setting the energy saving mode for the holiday period (continued) Vitotronic 300-K, MW1S
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Departure date
Fr
1. Open the cover on the programming
unit.
2. Press the heating circuit selector
button; the button is illuminated.
3. Press ; the ”Holiday
program” display appears
in the display window.
4. Press ; the display
changes to the ”Departure
date” (actual day of the
week).
5. / Press / until the
required departure date
appears.
If you want to erase the holiday
program during the setting
procedure, press again and
confirm ”Erase? Yes” with .
Return date
Tu
6. Press to confirm;
the display changes to the
”Return date” (the return
date shown is the day
following the entered
departure date).
7. / Press / until the
required return date
appears.
8. Press to confirm;
the display changes and
shows the boiler
temperature.
9. To set the temperature for the
duration of the holiday program
(only in the ”rw” heating
program):
Press .
Set the required value with the
or button.
Confirm by pressing ; the
temperature value stops flashing
and is stored.
10. Close the hinged cover on the
programming unit.
This temperature also applies to
the reduced room temperature
outside the holiday program.
After the departure date, ”Holiday
program” and the actual date appear
in the display window.
On the return date, the boiler
temperature appears in the display
window.
If you want to cancel the holiday
program before the selected return
date, press again and confirm
“Erase? Yes” with .
558 75 v .