Viessmann Vitotronic 200 Series Operating instructions

Operating instructions
for the system user
VIESMANN
Heating system with weather-compensated control unit
Vitotronic 200, type KO1B, KO2B or KW6B
VITOTRONIC 200
5592667 GB 3/2018 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.
Safety instructions
For your safety
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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.
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.
Safety instructions
For your safety (cont.)
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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. Information Symbols ................................................................................................. 7
2. Introductory information Intended use .......................................................................................... 8
Commissioning ...................................................................................... 8
Terminology ........................................................................................... 8
Your system is preset at the factory ....................................................... 8
Energy saving tips ................................................................................. 9
Tips for more comfort ............................................................................. 9
3. Operation Opening the control unit ......................................................................... 10
Programming unit .................................................................................. 11
■"Help" menu ........................................................................................ 12
■Symbols .............................................................................................. 12
Standard menu ...................................................................................... 12
Extended menu ...................................................................................... 13
How to use the controls ......................................................................... 13
Operating program ................................................................................. 16
■Operating programs for central heating, DHW, frost protection .......... 16
■Special operating programs ................................................................ 16
Time program ........................................................................................ 17
■Setting a time program using central heating as an example ............. 17
■Setting the time program efficiently .................................................... 18
■Deleting time phases .......................................................................... 18
4. Start-up/shutdown Starting the heating system ................................................................... 20
■Controls with the cover open .............................................................. 20
Shutting down the heating system ......................................................... 21
■With frost protection monitoring .......................................................... 21
■Without frost protection monitoring (shutdown) .................................. 22
5. Central heating Room temperature ................................................................................. 23
■Setting the standard room temperature for central heating ................ 23
■Setting the reduced room temperature for central heating ................. 23
Operating program ................................................................................. 23
■Setting the operating program for central heating .............................. 23
Time program ........................................................................................ 23
■Setting the time program for central heating ...................................... 24
Heating curve ......................................................................................... 24
■Setting the heating curve .................................................................... 24
Switching off central heating .................................................................. 24
Comfort function "Party mode" ............................................................ 25
■Setting "Party mode" for central heating ........................................... 25
■Cancelling "Party mode" ................................................................... 25
Energy saving function "Economy mode" ........................................... 25
■Setting "Economy mode" for central heating ................................... 25
■Cancelling "Economy mode" ............................................................ 26
Energy saving function "Holiday program" ............................................ 26
■Setting the "Holiday program" for central heating ............................ 26
■Cancelling or deleting the "Holiday program" .................................. 27
6. DHW heating DHW temperature .................................................................................. 28
Operating program ................................................................................. 28
■Setting the operating program for DHW heating ................................ 28
Time program ........................................................................................ 28
■Setting the time program for DHW heating ......................................... 28
■DHW heating once, no longer in the time program ............................ 28
■Setting the time program for the DHW circulation pump .................... 29
Switching off DHW heating .................................................................... 29
7. Further adjustments Setting the display contrast .................................................................... 30
Index
Index
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Setting the display brightness ................................................................ 30
Entering names for the heating circuits ................................................. 30
Setting the preferred heating circuit for the standard menu .................. 31
Setting the time and date ....................................................................... 31
Language selection ................................................................................ 31
Setting the temperature unit (°C/°F) ...................................................... 31
Restoring factory settings ...................................................................... 32
8. Scanning Scanning information ............................................................................. 33
Scanning the service messages ............................................................ 33
Scanning fault messages ....................................................................... 35
9. Emissions test mode ................................................................................................................ 36
10. What to do if... Rooms are too cold ................................................................................ 37
Rooms are too hot ................................................................................. 38
There is no hot water ............................................................................. 38
The DHW is too hot ............................................................................... 39
ã flashes and "Fault" is displayed ....................................................... 39
ë flashes and "Service" is displayed ................................................... 39
"Controls locked out" is displayed ...................................................... 39
"External hook-up" is displayed .......................................................... 39
"External program" is displayed .......................................................... 40
11. Repair work ................................................................................................................ 41
12. Ordering fuel oil Fuel oil quality ........................................................................................ 42
Fuel oil additives .................................................................................... 42
Combustion improvers ........................................................................... 42
Biofuels .................................................................................................. 42
13. Appendix Overview of extended menu .................................................................. 43
Calling up options under "Information" .................................................. 43
Terminology ........................................................................................... 44
Information on disposal .......................................................................... 48
■Disposal of packaging ........................................................................ 48
■Final decommissioning and disposal of the heating system ............... 48
14. Keyword index ................................................................................................................ 49
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.
Information
Symbols
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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. It is only designed for heating up heating water
that is of potable water quality.
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 heating the building or DHW shall be deemed
inappropriate.
Any usage beyond this must be approved by the man-
ufacturer in each individual case.
Incorrect usage 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
usage also occurs if the components in the heating
system are modified from their intended use (e.g. if the
flue gas and ventilation air paths are sealed).
Commissioning
The commissioning and matching of the control unit to
local conditions and building characteristics, as well as
instructing the user in the operation of the system,
must be carried out by your heating contractor.
As the user of new combustion equipment, you may be
obliged to notify your local flue gas inspector of the
installation [check local regulations]. Your local flue gas
inspector will also inform you [where appropriate]
about work he may be required to carry out on your
combustion equipment (e.g. regular checks, cleaning).
Terminology
To provide you with a better understanding of the func-
tions of your Vitotronic control unit some terminology is
explained.
The terms are marked as follows:
Further information can be found in chapter
"Terminology" in the appendix.
Your system is preset at the factory
Your heating system is preset at the factory and is
therefore ready for operation:
Central heating
■Between 06:00 and 22:00 h, the rooms are heated
to 20 °C "Set room temperature" (standard heating
mode).
■Between 22:00 and 06:00 h, the rooms are heated
to 3 °C "Set reduced room temp" (reduced room
temperature, frost protection).
DHW heating
■Between 05:30 and 22:00 h, DHW is heated to
50 °C "Set DHW temperature". Any installed DHW
circulation pump is ON.
■Between 22:00 and 05:30 h, the DHW cylinder is not
reheated. Any installed DHW circulation pump is
OFF.
Note
If DHW heating began before 22:00 h, it is stopped.
Frost protection
■Your boiler and DHW cylinder are protected against
frost.
Wintertime/summertime changeover
■This changeover is automatic.
Date and time
■The date and time were set by your heating contrac-
tor.
Your heating contractor can make further settings for
you during commissioning.
You can change the settings individually at any time to
suit your requirements.
Power failure
All settings are saved if there is a power failure.
If the heating system has been out of use for a pro-
longed period, reset the date and time.
Introductory information
Intended use
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Central heating
■Standard room temperature ("Set room tempera-
ture", see page 23):
Never overheat your home. Every degree of room
temperature reduction saves up to 6 % on your heat-
ing bills.
Never set your standard room temperature higher
than 20 °C.
■Time program (see page 17):
Heat your rooms to the standard room temperature
during the day and the reduced temperature at night.
Set the time program for this.
■Operating program:
If you do not require central heating, select one of
the following operating programs:
–"Only DHW" (see page 28):
If you require no heating for your home in summer,
but you need hot water.
–"Standby mode" (see page 21):
If you don't need to heat your home and don't need
hot water for longer periods.
■Short absence (see page 25):
Reduce the room temperature if you are going shop-
ping, for example. For this, select "Economy
mode".
■Holidays (see page 26):
If you are going away, select the "Holiday pro-
gram":
The room temperature will be reduced, and DHW
heating will be turned off.
■Ventilation:
To ventilate, close the thermostatic valves and open
the windows fully for a short time.
■Roller shutters:
Close roller shutters (where installed) at dusk.
■Thermostatic valves:
Ensure that thermostatic valves are properly set.
■Radiators:
Never cover radiators or thermostatic valves.
DHW heating
■DHW circulation pump (see page 29):
Only activate the DHW circulation pump for periods
in which DHW is regularly drawn off. Set the time
program for this.
■DHW consumption:
Consider showering instead of running a bath. A
shower generally uses less energy than a full bath.
For additional energy saving functions of the Vitotronic
control unit, please contact your heating contractor.
Tips for more comfort
Central heating
■Standard room temperature ("Set room tempera-
ture", see page 23):
You can select your individual preferred temperature
at any time in the standard menu.
■Preferred heating circuit (see page 31):
If your heating system consists of several heating cir-
cuits, you can make the most important adjustments
for a preferred heating circuit directly via the stand-
ard menu.
■Time program (see page 17):
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 (see page 24):
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" (see page 25):
Select "Party mode" if you want to heat your home
to a temperature that is different from that dictated by
the time program.
Example: The time program determines that in the
evening, your home is heated to a reduced room
temperature, but you have visitors staying into the
evening.
DHW heating
■Time program (see page 17 and 29):
Use the time program for DHW heating.
Use the time program for the DHW circulation pump.
During the selected time phases, DHW will be availa-
ble at the draw-off points at the required tempera-
ture.
Introductory information
Energy saving tips
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The control unit may look different depending on the
control unit type.
Vitotronic 200, type KO1B
C B
A
Fig. 1
ATop part of control unit with programming unit
BCover flap
CShort operating guide on the inside of the cover
Vitotronic 200, type KO2B
BA
Fig. 2
ACover flap
BShort operating guide on the inside of the cover
Operation
Opening the control unit
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Vitotronic 200, type KW6B
BA
Fig. 3
ATop part of control unit with programming unit
BPushbutton for changing the angle
Note
You will find a short operating guide in the "Technical
documentation".
Programming unit
You can change any settings on your heating system
centrally at the programming unit of the control unit.
If remote control units are installed in your rooms, you
can also adjust the settings at the remote control units.
Remote control operating instructions
14°C 21°C
Fig. 4
Takes you to the previous step in the menu or
cancels a setting that has been started.
Cursor keys
To scroll in the menu or to set values.
OK Confirms your selection or saves the setting.
Calls up "Help" (see following chapter) or addi-
tional information on the selected menu.
Calls up the extended menu.
Two control levels are available:
■The standard menu: See page 12.
■The extended menu: See page 13.
Note
The screensaver is activated if you have not made
any adjustments on the programming unit for a few
minutes (see page 14).
Operation
Opening the control unit (cont.)
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"Help" menu
Displays explanations about operation in the form of a
short guide.
Call up the short guide as follows:
■If the screensaver is active (see page 14):
Press .
■From anywhere in the menu:
Press repeatedly until the standard menu is
shown (see page 12).
Press .
Symbols
These symbols are not always displayed, but appear
subject to the system version and the operating state.
Indicators:
Frost protection enabled
Central heating to standard room temperature
Central heating with reduced room temperature
Party mode enabled
Economy mode enabled
In conjunction with a solar thermal system:
Solar circuit pump is running
Heating circuits:
Heating circuit ...
Heating programs:
, , :
For an explanation of the symbols, see page 16.
Messages:
Fault
Service
Standard menu
The following settings for the preferred heating circuit
(D) can be called up and adjusted in the standard
menu:
■Set room temperature
■Operating program
Call up the standard menu as follows:
■If the screensaver is active (see page 14):
Press OK.
■If you are in the extended menu (see page 13):
Press repeatedly until the standard menu
appears.
B
C
A
48 °CBoiler temperature
14 °C 21 °C
HC1
D
Fig. 5
AOperating program for the preferred heating circuit
(D)
BCurrent outside temperature
CSet room temperature for the preferred heating cir-
cuit (D)
DPreferred heating circuit (see page 31)
Not displayed if only one heating circuit is instal-
led.
Operation
Programming unit (cont.)
5592667

13
Note
■Settings for the preferred heating circuit can also be
adjusted in the extended menu (see page 13).
■The settings for any other connected heating circuits
can only be adjusted in the extended menu.
■Your heating contractor can block the operation of
the standard menu. In such cases, you will not be
able to make adjustments in either the standard
menu or in the extended menu.
Setting the standard room temperature for the pre-
ferred heating circuit
Press the following keys:
/ for the required value.
OK to confirm.
Setting the operating program for the preferred
heating circuit
Press the following keys:
/ for the required operating program.
OK to confirm.
Extended menu
In the extended menu, all settings for the Vitotronic
control unit's range of functions can be called up and
adjusted, including for example adjustments to the hol-
iday program and time programs.
You can find the menu overview on page 43.
Call up the extended menu as follows:
■If the screensaver is active (see page 14):
Press OK and then .
■From anywhere in the menu:
Press .
Note
Your heating contractor can block operation for the
extended menu. In this case, you can only call up
service and fault messages.
Menu
Test mode
Continue with
Solar energy
DHW
Heating
OK
E
Fig. 6
EDialogue line
How to use the controls
The screen saver will become active if you have not
adjusted any settings on the programming unit for a
few minutes. The display brightness is reduced.
Operation
Standard menu (cont.)
5592667

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Screen saver
14°C 21°C
B
C
Fig. 7
BCurrent outside temperature
CSet room temperature
1. Press OK. This takes you to the standard menu
(see page 12).
2. Press . This takes you to the extended menu
(see page 13).
The selected menu point is highlighted in white.
Dialogue line E (see diagram on page 13) shows
the necessary instructions.
Adjustments to the central heating can be made for
every heating circuit. It is therefore necessary to select
the respective heating circuit prior to making any
adjustments (e.g. room temperature).
The following diagram shows how to make adjust-
ments, using the set room temperature as an example.
The diagram shows the adjustment without and with
selection of the heating circuit, as well as different dia-
logue lines.
Operation
How to use the controls (cont.)
5592667

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Vv
or
OK
Ú
OK
OK
Heating circuit 1
Economy mode
ÙÚ
Party mode
HC1
Continue with
Htg circ. selection ÙÚ
HC2
Was selected
Heating circuit 2
Set room temperature HC1
20 °C
Change with (
Set room temperature HC1
22 °C
Adopt with OK
Set room temperature HC1
22 °C
Adopted
48 °CBoiler temperature
HC1
14 °C 21 °C
OK
ê
ê
ÙÚ
HC1
Heating circuit 2
Economy mode
ÙÚ
Party mode
HC1
Continue with OK
ê
ê
ÙÚ
HC2
Set reduced room temp
Set reduced room temp
Set room temperature
Set room temperature
Menu
DHW
Continue with OK
Test mode
Solar energy
Heating
Vv
or
OK
Set room temperature HC2
20 °C
Change with (
Set room temperature HC2
22 °C
Adopt with OK
Set room temperature HC2
22 °C
Adopted
OK / /
v v
Heating circuit 1
Economy mode
Party mode
HC1
Continue with OK
ê
ê
Set reduced room temp
Set room temperature
/
v v
OK
OK
Fig. 8
Operation
How to use the controls (cont.)
5592667

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Operating programs for central heating, DHW, frost protection
Symbol Operating program Function
Central heating and DHW heating
"Heating and DHW" ■The rooms of the selected heating circuit are
heated in accordance with the room temperature
and time program specified (see chapter "Central
heating").
■DHW is heated in accordance with the DHW
temperature and time program specified (see
chapter "DHW heating").
DHW heating
"Only DHW" ■DHW is heated in accordance with the DHW
temperature and time program specified (see
chapter "DHW heating").
■No central heating.
■Frost protection enabled.
Frost protection
"Standby mode" ■No central heating.
■No DHW heating.
■Frost protection for the boiler and the DHW cylin-
der is active.
Special operating programs
Display in the standard menu
40°CBoiler temperature
HC1
14°C 21°C
Screed drying
F
Fig. 9
Special operating programs F:
■"Screed drying"
This function is activated by your heating contractor.
Your screed is dried in line with a set time program
suitable for the building material (temperature:time
profile). Your settings for central heating have no
effect for the duration of the screed drying.
■"External hook-up"
Your heat pump control unit is regulated by a higher
control unit.
■"External program"
The operating program was changed by a communi-
cations interface (e.g. Vitocom 100).
■"Holiday program"
See page 26.
Note
You can call up the set operating program in the exten-
ded menu, under "Information" (see page 33).
Operation
Operating program
5592667

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The following explains how to input the settings for a
time program. The special features of each individual
time program are assigned to the relevant chapters.
You can set up a time program for the following func-
tions:
■Central heating (see page 23)
■DHW heating (see page 28)
■DHW circulation pump (see page 29)
In the time program, divide the day into sections.
These are called time phases. It is for you to decide
what happens in these time phases. For example, they
could specify when your rooms will be heated to stand-
ard room temperature.
■You can set the time program individually, to be the
same, or different, for every day of the week.
■You can select up to 4 time phases per day.
■For each time phase you select the start and end
points.
The selected time phase is illustrated by a white bar
on the time chart. The length of the bar reflects the
length of time.
■In the extended menu, you can call up the time pro-
grams under "Information" (see page 33).
Setting a time program using central heating as an example
Extended menu:
1.
2. "Heating"
3. If necessary, / for the required heating circuit.
4. "Heating time program"
5. Select part of the week or a day.
6. Select a time phase ! to $. The selected time
phase is illustrated by a white bar on the time chart.
7. Set the start and end points for the relevant time
phase. The length of the white bar in the time dia-
gram is adjusted accordingly.
8. Press to exit the menu.
Note
If you want to terminate a time phase setting process
prematurely, keep pressing until the required dis-
play appears.
Example of time phases within the time program
for central heating
Heating
Select with (
HC1
Mo-Fr
?16:30 - 23:00 u
0 2 4 6 8 10 12 14 16 18 20 22 24
!05:00 - 08:30 u
Normal
Normal
!?
Fig. 10
■Time program for the following part of the week:
"Monday–Friday" ("Mo-Fr")
■Time phase !:
05:00 to 08:30 h
■Time phase ?:
16:30 to 23:00 h
In between these time phases the system heats to a
reduced temperature.
Operation
Time program
5592667

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Setting the time program efficiently
If you would like to set a different time program for just
one day of the week, proceed as follows:
Example: You want to set a different time program for
Monday:
1. Select the period "Monday–Sunday" and set the
time program.
Heating time program
Monday
Saturday-Sunday
Monday-Friday
Monday-Sunday
ê
ê
ê
ç
HC1
Select with (
Fig. 11
Note
The tick is always set at the sections of the week
with identical time phases.
Factory setting: Same for all days of the week,
therefore "Monday-Sunday" is ticked.
2. Then select "Monday" and adjust the time program
for that day.
Note
The "Saturday-Sunday" part of the week is ticked
because the set time phases correspond only to this
part of the week.
Heating time program
Monday
Saturday-Sunday
Monday-Friday
Monday-Sunday
ê
ê
ê
ç
HC1
Select with (
Fig. 12
Deleting time phases
■Set the time for the end point to the same time that
was set for the start point.
Or
■For the start point, select a time prior to 00:00 h.
The display shows the selected time phase as
"- - : - -".
Operation
Time program (cont.)
5592667

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Heating
Adopt with
HC1
§u
0 2 4 6 8 10 12 14 16 18 20 22 24
?- -:- - - - -:- - u
Normal
Normal
Mo-Fr
- -:- - - - -:- -
OK
Fig. 13
Operation
Time program (cont.)
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Controls with the cover open
For cover flap, see page 10.
Vitotronic 200, type KO1B
BA C D E FG
14°C 21°C
Fig. 14
AFault indicator (red)
BOn indicator (green)
CTEST key
(only for service purposes)
DTemperature controller
EExcess temperature reset
FON/OFF switch
GCover flap
Vitotronic 200, type KO2B
A B D
14 °C 21 °C
C
Fig. 15
AFault indicator (red)
BOn indicator (green)
CON/OFF switch
DExcess temperature reset
Start-up/shutdown
Starting the heating system
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