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Operating instructions
for the system user
VIESMANN
Heating system and mechanical ventilation system with heat pump control unit
Vitotronic 200, type WO1C
VITOTRONIC 200
5817913 GB 11/2023 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 system
users.
This appliance can also be operated by children of 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 as well as in any risks aris-
ing 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.
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 system can
lead to life-threatening accidents.
Work on electrical equipment must only be car-
ried 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 and fittings.
In case of fire
Danger
Fires create a risk of burns.
Switch the system OFF.
Use a tested fire extinguisher, class ABC.
Safety instructions
For your safety
5817913
3
Conditions for siting
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
Unsuitable ambient conditions can lead to sys-
tem damage and can put safe operation at risk.
Maintain the permissible ambient tempera-
tures as detailed in the operating instructions.
Appliance for indoor installation:
Avoid air contamination through halogenated
hydrocarbons (e.g. as in paints, solvents
and cleaning agents).
Avoid continuously high humidity levels (e.g.
through continuous drying of washing).
Auxiliary components, spare and wearing parts
!Please note
Components that were not tested with the sys-
tem may cause system damage, or may affect
its functions.
Have all installation or replacement work carried
out by qualified contractors.
Safety instructions
For your safety (cont.)
5817913
5
Changing "Holiday program" ........................................................... 34
Cancelling or deleting the "Holiday program" .................................. 34
4. DHW heating Setting the standard DHW temperature ................................................. 35
Setting the higher DHW temperature ..................................................... 35
Setting the operating program for DHW heating .................................... 35
Setting the time program for DHW heating ............................................ 35
Setting start optimisation .................................................................... 36
Setting stop optimisation .................................................................... 36
Setting a time program for the DHW circulation pump .......................... 37
Increasing DHW temperature temporarily ............................................. 37
Starting 1x DHW heating .................................................................... 37
Stopping DHW heating .......................................................................... 37
You do not want to heat DHW, nor heat or cool the rooms: ................ 37
You do not want to heat DHW, but do want to provide central heat-
ing: ...................................................................................................... 38
5. Heating system with elec-
tric booster heater
Enabling or blocking the electric booster heater for central heating ...... 39
Enabling or blocking the electric booster heater for DHW heating ........ 39
Setting the time program for the electric booster heater ........................ 39
6. Active cooling mode Enabling and blocking active cooling mode ........................................... 40
7. Air/water heat pumps Setting the time program for quieter operation / ......................... 41
8. Mechanical ventilation Starting ventilation ................................................................................. 42
Stopping ventilation ............................................................................... 42
Switching on Standby mode ............................................................... 42
Ending "Standby mode" ................................................................... 43
Stopping ventilation to change the filters ............................................... 43
Setting the operating program for ventilation ......................................... 43
Ventilation without heat recovery ........................................................... 43
Setting the room temperature for ventilation ...................................... 43
Setting the minimum temperature for ventilation ................................ 44
Setting a time program for ventilation .................................................... 44
Increasing the ventilation level temporarily ............................................ 45
Setting "Intensive operation" for ventilation ..................................... 45
Ending "Intensive operation" ........................................................... 45
Saving energy during short periods of absence .................................... 46
Switching on Economy mode for ventilation ....................................... 46
Ending "Economy mode" ................................................................. 46
Saving energy during long periods of absence ..................................... 46
Setting "Holiday program" for ventilation, central heating/central
cooling ................................................................................................ 46
Changing "Holiday program" ........................................................... 47
Cancelling or deleting the "Holiday program" .................................. 47
9. Power from a photovoltaic
system
Utilising power from a photovoltaic system (power generated on site) .. 48
10. Smart Grid Utilising excess power ........................................................................... 49
11. Further adjustments Setting the display contrast .................................................................... 50
Setting the display brightness ................................................................ 50
Setting names for heating/cooling circuits ............................................. 50
Setting the preferred heating/cooling circuit for the standard menu ...... 51
Setting the time and date ....................................................................... 51
Setting menu language .......................................................................... 51
Setting the temperature unit (°C/°F) ...................................................... 51
Restoring factory settings ...................................................................... 52
Index
Index
5817913
6
12. Calling up information Calling up information ............................................................................ 53
Checking the solar energy yield ......................................................... 53
Calling up energy statement ............................................................... 53
Daily log .............................................................................................. 54
Screed drying ..................................................................................... 54
Calling up messages ............................................................................. 56
13. Manual mode ................................................................................................................ 58
14. Special system versions ................................................................................................................ 59
15. Switching on and off Heat pump control unit controls ............................................................. 60
Shutting down the heat pump ................................................................ 61
With frost protection monitoring .......................................................... 61
Without frost protection monitoring (shutting down the system) ......... 61
Starting the heat pump .......................................................................... 61
16. What to do if... Rooms are too cold ................................................................................ 62
Rooms are too hot ................................................................................. 63
There is no hot water ............................................................................. 63
The DHW is too hot ............................................................................... 63
" " is flashing and "Note" is displayed ............................................... 64
" " is flashing and "Warning" is displayed .......................................... 64
" " is flashing and "Fault" is displayed ............................................... 64
"Power-OFF C5" is displayed ............................................................... 64
"External hook-up" is displayed .......................................................... 64
"External program" is displayed .......................................................... 64
"Controls locked out" is displayed ...................................................... 64
"A0 Vent.: check filter(s)" is displayed ................................................ 65
Doors/windows can only be opened with difficulty ................................. 65
Doors/windows bang when opened ....................................................... 65
17. Maintenance Cleaning the heating system ................................................................. 66
Brine/water or water/water heat pumps .............................................. 66
Air/water heat pumps .......................................................................... 66
Air/water heat pumps with a plastic surface ....................................... 66
Programming unit of the heat pump control unit ................................. 66
Heating system inspection and maintenance ........................................ 66
DHW cylinder (if installed) .................................................................. 66
Safety valve (DHW cylinder) ............................................................... 67
Potable water filter (if installed) .......................................................... 67
Damaged cables / lines ...................................................................... 67
Cleaning the mechanical ventilation system .......................................... 67
Cleaning the supply air/extract air vents ............................................. 67
Cleaning the kitchen extract air vent .................................................. 68
Cleaning or replacing filters ................................................................... 69
Filters in the Vitovent 200-C ventilation unit ....................................... 69
Filters in the Vitovent 200-W ventilation unit ....................................... 71
Filters in the Vitovent 300-C ventilation unit ....................................... 73
Filters in the Vitovent 300-F ventilation unit ........................................ 75
Filters in the Vitovent 300-W ventilation unit ....................................... 76
Replacing filters in the extract air valves ............................................ 79
Resetting the filter change service indicator ....................................... 80
18. Appendix Refrigerant ............................................................................................. 81
Overview of extended menu .................................................................. 81
Terminology ........................................................................................... 88
Defrosting ........................................................................................... 88
Active cooling mode ("Active cooling") ............................................ 89
System version ................................................................................... 89
Index
Index
5817913
7
Operating program ............................................................................. 89
Operating status ................................................................................. 89
Pressure imbalance ............................................................................ 89
Utilisation of power generated on site ................................................ 89
Electric booster heater ........................................................................ 90
Enthalpy heat exchanger .................................................................... 90
Power-OFF ......................................................................................... 91
Underfloor heating .............................................................................. 91
Reduced noise operation .................................................................... 91
Heating mode/cooling mode ............................................................... 91
Heating curve/cooling curve ............................................................... 92
Heating/cooling circuits ....................................................................... 94
Heating circuit pump ........................................................................... 94
Instantaneous heating water heater ................................................... 94
Heating water/coolant buffer cylinder ................................................. 94
Heating water buffer cylinder .............................................................. 95
Cascade ............................................................................................. 95
Controlled mechanical ventilation ....................................................... 95
Cooling mode ..................................................................................... 96
Cooling functions ................................................................................ 97
Cooling curve ...................................................................................... 97
Cooling circuit ..................................................................................... 97
Output matching ................................................................................. 97
Ventilation ........................................................................................... 97
Mixer ................................................................................................... 98
Buffer cylinder ..................................................................................... 98
Room temperature .............................................................................. 98
Return temperature ............................................................................ 98
Smart Grid (SG) .................................................................................. 98
Safety valve ........................................................................................ 100
Secondary pump ................................................................................ 100
Solar circuit pump ............................................................................... 100
Cylinder primary pump ....................................................................... 100
Drinking water filter ............................................................................. 100
Evaporator .......................................................................................... 100
Compressor ........................................................................................ 100
Condenser .......................................................................................... 100
Flow temperature ................................................................................101
Heat pump cascade ............................................................................101
Weather-compensated heating/cooling mode .................................... 101
Domestic ventilation ........................................................................... 101
Time program ..................................................................................... 101
DHW circulation pump ........................................................................ 101
Two-stage heat pumps ....................................................................... 101
System equipment and functions ...........................................................102
Information on disposal ..........................................................................103
Disposal of packaging ........................................................................ 103
Final decommissioning and disposal of the heating system ...............103
19. Keyword index ................................................................................................................104
Index
Index (cont.)
5817913
8
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.
Appliance types
Symbol Meaning
Content only applies to brine/water heat
pumps.
Content only applies to air/water heat
pumps.
Content only applies to air/water heat
pumps with separate indoor/outdoor units.
Terminology
To provide you with a better understanding of the func-
tions of your Vitotronic control unit, some terminology
is explained. This information can be found in chapter
"Terminology" in the Appendix.
Intended use
The appliance is only intended to be installed and
operated 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
Central cooling
DHW heating
The range of functions can be extended with additional
components and accessories.
Introductory information
Symbols
5817913
9
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/cooling or DHW heating shall be
deemed inappropriate.
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 function.
Note
The appliance is intended exclusively for domestic or
semi-domestic use, i.e. even users who have not had
any instruction are able to operate the appliance
safely.
Product information
Heat pump control unit
The Vitotronic 200 heat pump control unit, type WO1C
controls all functions of your heating system with heat
pump and mechanical ventilation.
The heat pump control unit may be installed in different
locations depending on the type of heat pump: See
page 15.
At the front of the heat pump
At the top of the heat pump
In a separate enclosure on the wall
Heat pump types
Air/water heat pumps
Air/water heat pumps utilise energy from the ambient
air to generate heat. To achieve this, a fan draws the
ambient air through a heat exchanger (evaporator). In
the evaporator, the thermal energy from this ambient
air is transferred to the refrigerant circuit. Here, the
temperatures necessary for central heating and DHW
heating are generated. The refrigerant circuit is driven
by the compressor.
To provide central cooling, the refrigerant circuit oper-
ates in reverse mode. Heat is extracted from your
rooms and transferred to the ambient air via the evap-
orator.
Note
Air/water heat pumps can have two stages. Two-stage
air/water heat pumps have 2 compressors which can
be activated individually or simultaneously subject to
the requested heating output.
Air/water heat pumps are available in the following
casing/installation versions:
Heat pump for indoor installation
All of the heat pump components, including the heat
pump control unit, are housed in a casing and instal-
led inside the building. The outdoor air is brought to
the heat pump and returned to the outside via an air
duct system.
Heat pump for outdoor installation
All of the heat pump components, except for the heat
pump control unit, are housed in a casing that is
installed outside the building. The heat pump control
unit is mounted inside the building. The heat pump is
hydraulically connected to the heating system of the
building.
Air/water heat pumps with separate indoor/outdoor
units
The outdoor unit is installed outside the building or fit-
ted to the outside of the building. Heat is obtained from
the ambient air in the outdoor unit.
The indoor unit, including the heat pump control unit, is
installed inside the building and transfers the heat to
the heating system.
The indoor and outdoor units are connected to each
other hydraulically and electrically.
Introductory information
Intended use (cont.)
5817913
10
Brine/water heat pumps
Brine/water heat pumps utilise geothermal energy to
generate heat. The geothermal energy is transferred to
the refrigerant circuit using a heat transfer medium
(brine). Here, the temperatures necessary for central
heating and DHW heating are generated. Here too, a
compressor drives the refrigerant circuit.
To provide central cooling, the heat pump extracts heat
from your rooms and transfers it to the ground.
Brine/water heat pumps are installed inside the build-
ing.
Note
Brine/water heat pumps can have two stages. Two-
stage brine/water heat pumps have 2 compressors
which can be activated individually or simultaneously
subject to the requested heating output.
Depending on heat pump type, the two compressors
can be installed in a single casing or in 2 adjacent cas-
ing units. Both compressors are controlled by one
shared heat pump control unit.
Water/water heat pumps
Water/water heat pumps utilise e.g. groundwater to
generate heat, following the same principle as brine/
water heat pumps. The energy from the groundwater
reaches the refrigerant circuit via a heat transfer
medium.
With auxiliary components, a brine/water heat pump
can be used as a water/water heat pump.
Water/water heat pumps are installed inside the build-
ing.
Equipment and functions
The heat pump types differ in their equipment levels:
DHW cylinder
Electric booster heater (instantaneous heating water
heater)
High efficiency circulation pumps
The heat pump types differ in the available functions:
Number of heating circuits
Solar DHW heating
Central cooling
Noise reduction
Output control
Utilisation of power generated on site
Utilisation of excess power from the grid (Smart Grid)
Your contractor will have listed the equipment and
functions of your heating system in the form on
page 102.
Mechanical ventilation systems
Mechanical ventilation systems provide controlled ven-
tilation of detached houses or apartments.
If your Viessmann system includes mechanical ventila-
tion, the central ventilation unit can be controlled and
operated by the heat pump control unit.
Ventilation operation adapts automatically to your
requirements via a time program. "Economy mode"
and the "Holiday program" help you to save energy.
With "Intensive operation", you increase the air
changes in the building and quickly expel odours and
moisture to the outside.
The following central ventilation units are supported:
Vitovent 200-C
Vitovent 200-C is suitable for detached houses or
apartments with up to 120 m2 of living space.
Vitovent 200-C meets the requirements for passive
house use.
The ventilation unit can either be mounted on a wall or
installed on the ceiling.
As well as being controlled by the heat pump control
unit, ventilation can also be activated by a switch or
button (bathroom switch) connected to the ventilation
unit, e.g. if you need the highest ventilation level for a
short period.
Vitovent 200-W
Vitovent 200-W is suitable for detached houses or
apartments with up to 230 m2 of living space.
This ventilation unit is mounted on a wall.
To prevent moisture damage to the building, the venti-
lation unit adjusts the air changes automatically,
depending on the relative humidity in your rooms
(accessories required).
Vitovent 300-C
Vitovent 300-C is suitable for detached houses or
apartments with up to 90 m2 of living space.
Introductory information
Product information (cont.)
5817913
18
The lower information bar shows the following infor-
mation, depending on what you have installed on your
system:
"Flow temperature":
Temperature of the heating water or coolant at the
heat pump outlet:
This information is displayed if your system has a
heating water buffer cylinder or has no buffer cylin-
der at all.
"Buffer cyl.: Central heating"
Your system has a heating water/coolant buffer cylin-
der for central heating and central cooling: See
page 27.
For this buffer cylinder, you have switched central
heating on.
"Buffer cyl.: Central cooling"
Your system has a heating water/coolant buffer cylin-
der for central heating and central cooling: See
page 27.
For this buffer cylinder, you have switched central
cooling on.
Setting the standard temperature for the preferred heating/cooling circuit
Press the following keys:
1. / for the required value
2. OK to confirm
Setting the operating program for the preferred heating/cooling circuit
Press the following keys:
1. / for the required operating program
2. OK to confirm
Extended menu: Displays and settings
In the extended menu, you can adjust and call up all
the settings from the heat pump control unit range of
functions, e.g. holiday program and time programs.
You can find the menu overview from page 81.
Call up the extended menu as follows:
If the screensaver is active:
Press OK and then .
From anywhere in the menu:
Press .
Note
Your contractor can block operation for the extended
menu. In this case, you can only call up messages
(see page 53) and start manual mode (see
page 58). Use manual mode only after consulting
your contractor.
Fig. 6
FDialogue line
Operating the heat pump control unit
Standard menu: Displays and settings (cont.)
5817913
18

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