Viessmann VITOCROSSAL 300 User manual

Please file in Service Binder
5673 650 - 01 04/2015
Operating Instructions
VITOCROSSAL 300
With Vitotronic 200 KW6B Controls
Vitocrossal 300
CU3A Series 26 to 57
Floor mounted, gas-fired condensing boiler with MatriX gas burner and Lambda Pro control
For operation with natural gas and liquid propane gas
Heating input 19 to 199 MBH
5.6 to 58 kW
Read and save these instructions
for future reference.
Product may not be exactly as shown
IMPORTANT
H
Do not store or use gasoline or other
flammable liquids in the vicinity of this
or any other appliance.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliances.
Do not touch any electrical switches,
do not use any phone in your building.
Immediately call your gas supplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
If you cannot reach your gas supplier,
call the fire department.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
If the information in this manual is not followed
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
WARNING
Improper installation, adjustment, and/
or operation could cause carbon monoxide
poisoning resulting in injury or loss of life.
This product must be installed and serviced
by a professional service technician who is
experienced and qualified in hot water boiler
installation and gas combustion.
WARNING

Vitocrossal 300 CU3A 26 to 57 Operating
5673 650 - 01
Safety
Safety, Installation and Warranty Requirements
Please ensure that these instructions are read and understood before commencing installation. Failure to comply with
the instructions listed below and details printed in this manual can cause product/property damage, severe personal
injury, and/or loss of life. Ensure all requirements below are understood and fulfilled (including detailed information
found in manual subsections).
WARNING
Installers must follow local regulations with respect to
installation of carbon monoxide detectors. Follow the
Viessmann maintenance schedule of the boiler contained
in this manual.
Product documentation
Read all applicable documentation before commencing
installation. Store documentation near boiler in a
readily accessible location for reference in the future
by service personnel.
For a listing of applicable literature,
please see section entitled “Important
Regulatory and Safety Requirements”.
Warranty
Information contained in this and
related product documentation must
be read and followed. Failure to do
so renders the warranty null and void.
Licensed professional heating contractor
The installation, adjustment, service and maintenance
of this equipment must be performed by a licensed
professional heating contractor.
Please see section entitled
“Important Regulatory and Installation
Requirements”.
Contaminated air
Air contaminated by chemicals can cause by-products
in the combustion process, which are poisonous to
inhabitants and destructive to
Viessmann equipment.
For a listing of chemicals which
cannot be stored in or near the
boiler room, please see subsection
entitled “Mechanical room” in the
“Installation Instructions”.
Advice to owner
Once the installation work is complete, the heating
contractor must familiarize the system operator/
ultimate owner with all equipment, as well as safety
precautions/requirements, shutdown procedure, and
the need for professional service annually before the
heating season begins.
Carbon monoxide
Improper installation, adjustment, service and/or
maintenance can cause flue products to flow into
living space. Flue products contain poisonous carbon
monoxide gas.
For information pertaining to the
proper installation, adjustment, service
and maintenance of this equipment to
avoid formation of carbon monoxide,
please see subsection entitled
“Mechanical room” and “Venting
requirements” in the “Installation Instructions”.
Fresh air
This equipment requires fresh air for
safe operation and must be installed
ensuring provisions for adequate
combustion and ventilation air exist.
For information pertaining to the
fresh air requirements of this product,
please see subsection entitled
“Mechanical room” in the “Installation
Instructions”.
Equipment venting
Never operate boiler without an installed venting
system. An improper venting system can cause
carbon monoxide poisoning.
For information pertaining to
venting and chimney requirements,
please see section entitled “Venting
Connection”. All products of
combustion must be safely vented
to the outdoors.
Operating and Service Documentation
It is recommended that all product documentation such
as parts lists, operating and service instructions be handed
over to the system user for storage. Documentation is to
be stored near boiler in a readily accessible location for
reference by service personnel.
WARNING
This boiler requires fresh air for safe operation and must
be installed with provisions for adequate combustion
and ventilation air (in accordance with local codes and
regulations of authorities having jurisdiction).
Do not operate this boiler in areas with contaminated
combustion air. High levels of contaminants such as
dust, lint or chemicals can be found at construction
sites, home renovations, in garages, workshops, in dry
cleaning/laundry facilities, near swimming pools and in
manufacturing facilities.
Contaminated combustion air will damage the boiler
and may lead to substantial property damage, severe
personal injury and/or loss of life. Ensure boiler/burner
is inspected and serviced by a qualified heating
contractor at least once a year in accordance with the
Service Instructions of the boiler.
2

Table of Contents
3
Page
Vitocrossal 300 CU3A 26 to 57 Operating
5673 650 - 01
Safety
General Information
Controls
Operation
Safety, Installation and Warranty Requirements..............2
About these Instructions.............................................6
For your Safety ..........................................................6
Operation .............................................................6
Working on the equipment ......................................6
Maintenance and cleaning.......................................6
Flue gas smell .......................................................6
Dangerous conditions .............................................6
Technical information .............................................6
Carbon monoxide...................................................7
For safe operation..................................................7
Frozen water pipe hazard ........................................8
Replacement components, spare and wear parts........8
Installation area conditions......................................8
Sources of combustion and ventilation air
contaminants ........................................................8
Commissioning ..........................................................9
Terminology ..............................................................9
Your System is Preset at the Factory ............................9
Central heating ......................................................9
Time and date .......................................................9
Power failure.........................................................9
DWH heating ........................................................9
Frost protection .....................................................9
Wintertime/summertime changeover.........................9
Energy Savings Tips .................................................10
Central heating ....................................................10
DHW heating ......................................................10
Tips for More Comfort ..............................................11
DHW heating ......................................................11
Central heating ....................................................11
Opening the Control Unit...........................................11
Overview of Controls................................................12
Modular structure ................................................12
Programming unit (H01B)......................................12
Programming Unit ....................................................13
“Help” menu .......................................................13
Symbols .............................................................13
Standard Menu ........................................................14
Setting the standard room temperature for the
primary heating circuit..........................................14
Setting the operation program for the
primary heating circuit..........................................14
Extended Menu ........................................................14
How to Use the Controls...........................................15
Operating Program ...................................................16
Operating programs for central heating, DHW, frost
protection ...........................................................16
Special operating programs ...................................15
With frost protection monitoring ............................16
Without frost protection monitoring........................16
Information on a prolonged shutdown.....................16
Time Program ..........................................................17
Example of time phases within the time program for
central heating ....................................................17
Setting a time program .........................................17
Setting a time program using central heating ...........17
Setting the time program efficiently .......................18
Deleting time phases ............................................18

Table of Contents
4
Page
Vitocrossal 300 CU3A 26 to 57 Operating
5673 650 - 01
Start-up/Shutdown
Central Heating
DHW Heating
Additional Adjustments
Starting the Heating System ......................................19
Shutting Down the Heating System ............................19
With frost protection monitoring ............................19
For the primary heating circuit ...............................19
For all heating circuits ..........................................19
Pump exercise function ........................................19
Ending the heating program “Standby mode” ..........19
Without frost protection monitoring........................19
Information on an extended shutdown....................19
Room Temperature ...................................................20
Setting the standard room temperature for central
heating...............................................................20
Setting the reduced room temperature for central
heating ..............................................................20
Setting the Operating Program for Central Heating........20
Time Program ..........................................................20
Setting the time program for central heating............20
Heating Curve..........................................................21
Setting the heating curve......................................21
End Central Heating..................................................21
For the primary heating circuit ...............................21
Comfort Function “Party Mode...................................22
Selecting the comfort function “Party mode”...........22
Setting “Party mode” for central heating.................22
Cancelling “Party mode” .......................................22
Energy Saving Function “Economy Mode” ...................22
Selecting the energy savings function “Economy mode” 22
Setting “Economy mode” for central heating ...........22
Cancelling “Economy mode” .................................22
Energy Saving Function “Holiday Program”..................23
Selecting the energy savings function “Holiday
program” ............................................................23
Setting “Holiday Program” for central heating..........23
Display in the exended menu.................................23
Cancelling or deleting the “Holiday program”...........23
Setting the DHW Temperature ...................................24
Factory setting 122ºF (50ºC) ................................24
Operating Program ...................................................24
Setting the operating program for DHW heating.......24
Time Program ..........................................................25
Setting the time program for DHW heating..............25
DHW heating outside of the time program...............25
Setting the time program for the DHW recirculation
pump .................................................................25
Switching Off DHW Heating ......................................26
Setting the Display Contrast ......................................27
Setting the Display Brightness....................................27
Entering Names for the Heating Circuits ......................27
Setting the Primary Heating Circuit for the
Standard Menu ........................................................28
Setting the Time and Date.........................................28
Language Selection ..................................................28
Setting the Temperature Unit ºF ºC.............................29
Restoring Factory Settings.........................................29

Table of Contents
5
Page
5673 650 - 01
Scanning Information................................................30
Calling up the solar yield in conjunction with solar
thermal systems ..................................................30
Resetting data .....................................................30
Scanning the Service Messages .................................31
Calling up an acknowledged service message ..........31
Scanning Fault Messages ..........................................32
Calling up an acknowledged fault message..............32
Emissions Test Mode ................................................33
Ending emissions test mode ..................................33
Rooms are too Cold ..................................................34
Rooms are too Hot ...................................................35
There is no Hot Water...............................................35
The DHW is too Hot .................................................35
“Flashes” and “Fault” is Displayed..............................36
“Flashes” and “Service” is Displayed ..........................36
“Controls Locked Out” is Displayed ............................36
“External Hook-up” is Displayed .................................36
“External Program” is Displayed .................................36
Inspection/Cleaning/Maintenance................................37
Cleaning .............................................................37
Inspection and maintenance ..................................37
Boiler .................................................................37
DHW tank...........................................................37
Safety valve (DHW tank) ......................................37
Potable water filter (if installed) .............................37
Overview of Extended Menu......................................38
Calling up Options Under “Information”.......................39
Scanning options in the extended menu..................39
Terminology ............................................................40
Operating program ...............................................40
Operating status ..................................................40
Extension kit for heating circuit with mixing valve....40
Mixing valve .......................................................40
Under floor heating system ...................................40
Standard heating mode.........................................40
Reduced heating mode .........................................40
Room temperature-dependent heating mode............40
Weather-compensated heating mode ......................40
Heating curve......................................................41
Heating circuit.....................................................42
Heating circuit pump ............................................42
Room temperature ...............................................42
Safety valve........................................................42
Solar circuit pump................................................42
Set temperature...................................................42
DHW pump .........................................................42
Drinking water filter .............................................42
Weather-compensated heating mode ......................42
DHW recirculation pump .......................................42
Vitocrossal 300 CU3A 26 to 57 Operating
Scanning
Emissions
Troubleshooting
Maintenance
Additional Information

Vitocrossal 300 CU3A 26 to 57 Operating
5673 650 - 01
6
Safety
About these Instructions
Take note of all symbols and notations intended to draw attention to potential hazards or important product
information. These include “WARNING”, “CAUTION”, and “IMPORTANT”. See below.

IMPORTANT
Warnings draw your attention to the presence of
potential hazards or important product information.
Cautions draw your attention to the presence of
potential hazards or important product information.
Helpful hints for installation, operation or maintenance
which pertain to the product.
This symbol indicates that additional, pertinent
information is to be found.
This symbol indicates that other instructions must
be referenced.
WARNING
Indicates an imminently hazardous situation which,
if not avoided, could result in loss of life, serious injury
or substantial product/property damage.
CAUTION
Indicates an imminently hazardous situation which,
if not avoided, may result in minor injury or product/
property damage.
For your Safety
Operation
Before operating the boiler, make sure you fully
understand its method of operation. Your heating
contractor should always perform the initial start-up
and explain the system. Any warranty is null and void
if these instructions are not followed.
Working on the equipment
All personnel working on the equipment or the heating
system must have the proper qualifications and hold all
necessary licenses.
Ensure main power to equipment, heating system, and
all external controls has been deactivated. Close main
gas supply valve. Take precautions in all instances to
avoid accidental activation of power during service work.
Maintenance and cleaning
Regular inspection and service by a qualified heating
contractor is important to the performance of the
Viessmann Vitocrossal 300 CU3A Series. Neglected
maintenance impacts on warranty; regular inspection
ensures clean, environmentally friendly and efficient
operation. We recommend a maintenance contract with
a qualified heating contractor.
Flue gas smell
- Deactivate heating equipment.
- Open windows and doors.
- Inform your heating contractor.
Dangerous conditions
- Deactivate main power immediately.
- Close gas supply valve.
Technical information
Literature applicable to all aspects of the Vitocrossal 300
CU3A Series:
- Technical Data Manual
- Installation Instructions
- Service Instructions
- Operating Instructions and User’s Information Manual
Additional applicable literature:
- Accessory manuals

7
5673 650 - 01
Vitocrossal 300 CU3A 26 to 57 Operating
For your Safety (continued)
Safety
Carbon monoxide
The U.S. Consumer Product Safety Commission strongly
recommends the installation of carbon monoxide
detectors in buildings in which gas-burning equipment
is installed. Carbon monoxide (CO) is a colorless,
odorless gas, which may be produced during incomplete
combustion of fuel and/or when the flame does not
receive an adequate supply of combustion air.
Carbon monoxide can cause severe personal injury or
loss of life.
Therefore, carbon monoxide detectors that are in
compliance with a nationally recognized standard
(e.g. ANSI/UL 2034, CSA 6.19) should be installed
and maintained in buildings that contain gas-burning
equipment.
Note: Viessmann does not test any detectors and makes
no representation regarding any brand or type of
detector.
For safe operation
We recommend that you frequently:
- Check for debris which could obstruct the flow of
flue gases. The vent or chimney must not be blocked.
A blocked or partially blocked vent or chimney can
cause flue gases to leak into the structure.
Flue gases leaking into the house can cause injury
or loss of life. Blocked or partially blocked chimneys
must have the blockage removed by a qualified
heating contractor.
- Check pressure gage for correct system (water)
pressure. Check for water on the floor from the
discharge pipe of the pressure relief valve or any
other pipe, pipe joint, valve or air vent.
- Check for moisture, water, or appearance of rust
on the flue gas pipes, their joints as well as vent
dampers, or side wall vent terminals (if so equipped).
- Ensure that nothing is obstructing the flow of
combustion and ventilation air and no chemicals,
garbage, gasoline, combustible materials, flammable
vapors and liquids are stored (not even temporarily)
in the vicinity of the boiler.
- Do not allow unsupervised children near the boiler.
Service/inspection of the boiler and the system is
recommended once a year. Maintenance, service and
cleaning are specified in the Installation Instructions.
Before the heating season begins, it is recommended that
the boiler and burner be serviced by a qualified heating
contractor. Service contracts may be established through
gas suppliers or other licensed contractors in your area.
WARNING
As there are no user-serviceable parts on the boiler,
burner or control, the end-user must not perform
service activities or adjustments of any kind on system
components. Failure to heed this warning can cause
property damage, severe personal injury, or loss of life.
CAUTION
Should overheating occur or the gas supply fail to
shut off, do not disconnect the electrical supply to the
pump. Instead, shut off the gas supply at a location
external to the appliance.
WARNING
The operator/ultimate owner is required to have the
heating boiler, burners, and controls checked, as a
minimum once per year, by the original installer or
by a competent heating contractor familiar with the
equipment. Defects must be corrected immediately.
CAUTION
Do not use this boiler if any part has been under water.
Immediately call a qualified heating contractor to
inspect the boiler and to replace any part of the control
system and any gas control which has been under
water.
WARNING
Improper installation, adjustment, service, or
maintenance can cause flue products to flow into
living space. Flue products contain poisonous carbon
monoxide gas which can cause nausea or asphyxiation
resulting in severe personal injury or loss of life.

Vitocrossal 300 CU3A 26 to 57 Operating
5673 650 - 01
8
For your Safety (continued)
Safety
Frozen water pipe hazard
Your heating boiler is designed to provide a warm and
comfortable living environment. It is not designed to
ensure against freezing of water pipes.
The boiler is equipped with several safety devices that
are designed to shut down the boiler and to prevent it
from restarting in the event of various unsafe conditions.
If your boiler remains off for an extended period of time
during cold weather, water pipes may freeze and burst,
resulting in extensive water damage and conditions in
which mold could grow. Certain molds are known to
cause respiratory problems, as well as to pose other
serious health risks. In case of water damage, immediate
measures should be taken to dry out affected areas as
quickly as possible to prevent mold from developing.
If your home will be unattended for an extended period
of time during cold weather, you should...
Shut off the water supply to the building, drain the
water pipes and add an antifreeze for potable water
to drain traps and toilet tanks. Open faucets where
appropriate.
Or..
Have someone check the building frequently during
cold weather and call a qualified service agency if
required.
Or...
Install a reliable remote temperature sensor that will
notify somebody of freezing conditions within the
home.
WARNING
Failure to protect against frozen pipes could result in
burst water pipes, serious property damage and/or
personal injury. Boiler may shut down. Do not leave
your home unattended for long periods of time during
freezing weather conditions without turning off the
water supply and draining water pipes or otherwise
protecting against the risk of frozen pipes.
Replacement components, spare and wear parts
Components which are not tested with the heating
system may damage the heating system or affect its
functions. Installation or replacement may only be
performed by a qualified heating contractor.
IMPORTANT
Installation area conditions
Ensure ambient temperatures are higher than 32°F (0°C)
and lower than 104°F (40°C).
Prevent the air from becoming contaminated by
halogenated hydrocarbons (e.g. as contained in
paint solvents or cleaning fluids) and excessive dust
(e.g. through grinding or polishing work).
Combustion air for the heating process, and
ventilation of the boiler room must be free of
corrosive contaminants. To that end, any boiler
must be installed in an area that has no chemical
exposure.
The list below indicates the main, currently known
sources.
Avoid continuously high levels of humidity
(e.g. through frequent drying of laundry).
Never close existing ventilation openings.
Sources of combustion and ventilation air contaminants
Areas likely to contain contaminants:
New building construction
Swimming pools
Remodelling areas, hobby rooms
Garages with workshops
Furniture refinishing areas
Dry cleaning/laundry areas and establishments
Auto body shops
Refrigeration repair shops
Metal fabrication plants
Plastic manufacturing plants
Photo processing plants
Beauty salons
Products containing contaminants:
Chlorine-type bleaches, detergents and cleaning
solvents found in household laundry rooms
Paint and varnish removers
Hydrochloric acid, muriatic acid
Chlorine-based swimming pool chemicals
Spray cans containing chlorofluorocarbons
Chlorinated waxes and cleaners
Cements and glues
Refrigerant leaks
Calcium chloride used for thawing
Sodium chloride used for water softening salt
Permanent wave solutions
Adhesives used to fasten building products and
other similar items
Antistatic fabric softeners used in clothes dryers
WARNING
Incorrect ambient conditions can lead to damage to
the heating system and put safe operation at risk.

9
5673 650 - 01
Vitocrossal 300 CU3A 26 to 57 Operating General Information
Commissioning
DHW heating
Constant 24 h, the DHW tank is heated
to 122°F (50°C) “Set DHW temperature”.
Any installed DHW recirculation pump is on.
Set time program for night setback.
Frost protection
Your boiler and DHW tank are protected against
frost.
Wintertime/summertime changeover
This changeover is automatic.
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.
Terminology
To provide you with a better understanding of the
functions of your Vitotronic control unit some terminology
is explained.
The terms are marked as follows:
Further information can be found in the “Terminology”
section.
Your System is Preset at the Factory
Your heating system is preset factory preset to ‘Heating
and DHW’ and is therefore ready for use.
Central heating
Constant 24 h, the rooms are heated
to 68°F (20°C) “Room temp setpoint” (standard
heating mode).
Reduced room temperature, the rooms are heated to
64°F (18°C) “Red. room temp setpoint” (reduced
room temperature, frost protection when used with
time program).
Your heating contractor can make further settings
for you during commissioning. You can change any
settings individually at any time to suit your
requirements (see “Central heating”).
Time and date
The day and time were set by your heating contractor
during commissioning.
Power failure
All settings are saved if there is a power failure.
If the heating system has been powered off for a
prolonged period, reset the date and time (refer to
page 28).

Vitocrossal 300 CU3A 26 to 57 Operating
5673 650 - 01
10
Energy Saving Tips
Central heating
Standard room temperature (“Room temp setpoint”,
refer to page 20):
Never overheat your home. Every degree of room
temperature reduction saves up to 6% on your
heating bills.
Never set your standard room temperature higher
than 68°F (20°C).
Time program (refer to 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” (refer to page 24):
If you require no heating for your home in summer,
but you need hot water.
– “Standby mode” (refer to page 21):
If you don’t need to heat your home and don’t need
hot water for longer periods.
Short absence (refer to page 22):
Reduce the room temperature if you are going
shopping, for example. For this, select “Economy
mode”.
Holidays (refer to page 23):
If you are going away, select the “Holiday program”:
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 recirculation pump (refer to page 25):
Only activate the DHW recirculation 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
Vitocrossal 300 CU3A, please contact your heating
contractor.
General Information

11
5673 650 - 01
Vitocrossal 300 CU3A 26 to 57 Operating
Tips for More Comfort
Central heating
Standard room temperature (“Room temp setpoint”,
refer to page 20):
You can select your desired temperature at any time
in the standard menu.
Primary heating circuit (refer to page 28):
If your heating system consists of several heating
circuits, you can make the most important adjustments
for a primary heating circuit directly via the standard
menu.
Time program (refer to page 17):
Make use of the time program. In the time program,
you can set time phases with different room
temperatures, for example different temperatures for
day and night time.
Heating curve (refer to page 21):
The heating curve enables you to individually adjust
the heating system to the actual heat demand in your
home. If set correctly, your desired temperature will
be achieved all year round.
“Party mode” (refer to page 22):
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.
General Information/Controls
Vitotronic 200, type KW6B
Legend
ATop part of control unit with programming unit
BPushbutton for changing the angle
DHW heating
Time program (refer to pages 15 and 27):
Use the time program for DHW heating.
Use the time program for the DHW recirculation pump.
During the selected time phases, DHW will be available
at the draw-off points at the required temperature.
Opening the Control Unit

Vitocrossal 300 CU3A 26 to 57 Operating
5673 650 - 01
12
Overview of Controls
Controls
Modular structure
The control unit is integrated into the boiler. The control
unit comprises a standard unit, electronics modules and
a programming unit.
Standard unit:
■ON/OFF switch
■Optolink laptop interface
■Operating and fault indicators
■Reset button
■Fuses
Programming unit (HO1B):
■Easy operation through:
– Plain text display with graphic ability
– Large font and black & white depiction for good
contrast
– Context-sensitive help text
■With digital time switch
■Control keys for:
– Navigation
– Confirmation
– Help and additional information
– Menu
■Setting the:
– Standard room temperature
– Reduced room temperature
– DHW temperature
– Heating program
– Time programs for central heating, DHW heating
and DHW recirculation
– Economy mode
– Party mode
– Holiday program
– Heating curves
– Coding addresses
– Actuator tests
– Test mode
■Displaying the:
– Boiler water temperature
– DHW temperature
– Operating details
– Diagnostic details
– Fault messages

13
5673 650 - 01
Vitocrossal 300 CU3A 26 to 57 Operating Operation
Programming Unit
You can change any settings on your heating system
centrally at the programming unit of the boiler control
unit.
If remote control units are installed in your rooms, you
can also adjust the settings at the remote control units.
Refer to the remote control
operating instructions
Legend
Takes you to the previous step in the menu or
cancels a setting that has been started
Cursor keys To scroll through the menu or to set
values
OK Confirms your selection or saves the setting
? Calls up help or additional information on the
selected menu.
Calls up the extended menu
Two control levels are available:
The standard menu: Refer to page 14.
The extended menu: Refer to page 14.
Note: The screen saver is activated if you have not made
any adjustments on the programming unit for a few
minutes (refer to page 15).
“Help” menu
Displays explanations about operation in the form of a
short guide.
Call up the short guide as follows:
If the screen saver is active (refer to page 15):
Press ? .
From anywhere in the menu:
Keep pressing the key until the standard menu
is displayed (refer to page 14).
Press ? .
Symbols
These symbols are not always displayed, but appear
subject to the system version and the operating state.
Indicators:
e Frost protection enabled
s Central heating to standard room temperature
m 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 ...
Operating programs:
For an explanation of the symbols (refer to page 16).
Messages:
 Fault
Service

Vitocrossal 300 CU3A 26 to 57 Operating
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14
Standard Menu
Legend
AHeader (shows the operating program for displayed
heating circuit D)
BCurrent outside temperature
CSet room temperature
DHeating circuit which is selected for operation in the
standard menu (primary heating circuit)
The following settings for the primary heating circuit
Dcan be called up and adjusted in the standard
menu:
Standard room temperature
Operating program
Call up the standard menu as follows:
If the screen saver is active (refer to page 15):
Press OK.
If you are in the extended menu:
Keep pressing the button until the standard menu
appears.
Note: Settings for the primary heating circuit can also
be adjusted in the extended menu
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 primary
heating circuit (displayed in the header D)
Press the following keys:
for the required value.
OK to confirm.
Setting the operating program for the primary
heating circuit (displayed in the header D)
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 holiday
program and time programs.
The menu overview can be found on page 38.
Call up the extended menu as follows:
If the screen saver is active (refer to page 15):
Press OK and then .
From anywhere in the menu:
Press .
Note: Your heating contractor can block access to the
extended menu. In this case, you can only call up
service and fault messages.
Legend
EDialogue line
Operation

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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.
1. Press
OK . This takes you to the standard menu
(refer to page 14).
2. Press This takes you to the extended menu (refer
to page 14). The selected menu option is highlighted
in white. The dialogue line E(refer to diagram on
page 14) then 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. standard room temperature).
The following diagram shows how to make adjustments,
using the standard room temperature as an example.
The diagram shows the adjustment without and with
selection of the heating circuit, as well as different dialog
lines.
Legend
BCurrent outside temperature
CStandard room temperature
Operation

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Operation
Operating Program
Symbol Operating program Function
Central heating and DHW heating
w “Heating and DHW” HThe rooms of the selected heating circuit are heated
in accordance with the room temperature and time
program specified (see section “Central heating”).
HDHW is heated in accordance with the DHW
temperature and time program specified (see section
“DHW heating”).
“Only DHW”
w
“Only DHW” HDHW is heated in accordance with the DHW
temperature and time program specified (see section
“DHW heating”).
HNo central heating.
HFrost protection enabled.
Frost protection
9
“Standby mode” HNo central heating.
HNo DHW heating.
HFrost protection for the boiler and the DHW tank is active.
Operating programs for central heating, DHW, frost protection
Legend
FSpecial operating programs
Special operating programs
“External hook-up”
Your heat pump control unit is regulated by a higher
control unit.
“External program”
The operating program was changed by a
communications interface (e.g. Vitocom 100).
“Holiday program”
Refer to page 23.
Note: In the extended menu, you can call up the set
operating program under “Information”
(refer to page 39).
IMPORTANT
With frost protection monitoring
For every heating circuit select the “Standby mode”
operating program
HNo central heating
HNo DHW heating
HFrost protection for the boiler and the DHW tank
is active.
Single boiler system control: Refer to page 20
If outdoor temperatures of below 37°F (3°C) are expected,
take appropriate measures to protect the heating system
from frost.
If necessary, contact your heating contractor.
Information on a prolonged shutdown
HCirculation pumps may seize up as they are not being
supplied with power.
HIt may be necessary to reset the date and time
(refer to page 28).
Without frost protection monitoring (shutdown)
When the boiler control and accessories are de-energized,
frost protection is not active for the boiler or the DHW
tank.

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Time Program
Operation
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.
Setting a time program for the following functions:
HCentral heating (refer to page 20)
HDHW heating (refer to page 25)
HDHW recirculation pump (refer to page 25)
HYou can set the time program individually, to be the
same for every day of the week or different: You can
select up to 4 time phases per day for standard heating
mode. Set the start and end points for each time phase.
Between these time phases, the rooms are heated with
the reduced room temperature (see chapter “Setting the
room temperature for reduced heating mode”).
HWhen setting, bear in mind that your heating system
requires some time to heat the rooms to the required
temperature.
HYou can set the time program individually, to be the
same, or different, for every day of the week.
HYou can select up to 4 time phases per day.
HFor each time phase you will need to 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.
HIn the extended menu, you can call up the time
programs under “Information” (refer to page 39).
Setting a time program using central heating as an example
Extended menu:
1.
2. “Heating”
3. Poss. 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 diagram
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 display appears.
Example of time phases within the time program for
central heating
HTime program for the following part of the week:
“Monday–Friday” (“Mo-Fr”)
HTime phase !:
05:00 to 08:30 h
HTime phase ?:
16:30 to 23:00 h
In between these time phases the system heats to a
reduced temperature.

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Operation
Time Program (continued)
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.
Note: The check mark 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 checked.
2. Then select “Monday” and adjust the time program
for that day.
Note: The “Saturday-Sunday” part of the week is
checked because the set time phases correspond
only to this part of the week.
Deleting time phases
HSet the time for the end point to the same time that
was set for the start point.
Or
HFor the start point, select a time prior to 00:00 h.
The display shows the selected time phase as
“- - : - -”.

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Starting the Heating System
Start-up/Shutdown
Legend
AFault indicator (red)
BOn indicator (green)
CReset button
DON/OFF switch
Vitotronic 200, type KW6B Ask your heating contractor about the following:
HBoiler type and relevant control unit type
HRequired system pressure
HLocation of the pressure gauge, shut-off valve, gas
shut-off valve, ventilation apertures
1. Check the heating system pressure at the pressure
gauge. If the pressure of the heating system is too low,
top up the water or notify your heating contractor.
2. In boilers for room air dependant operation:
Check that the ventilation apertures of the mechanical
room are open and unrestricted.
3. Open the gas shut-off valve(s).
4. Switch ON the power supply, e.g. at a separate
MCB/fuse or a mains isolator.
5. Switch ON the ON/OFF switch
After a short time, the standard menu is displayed
(refer to page 14) and the green ON indicator illuminates.
Your heating system and, if installed, your remote control
unit are now ready for use.
Shutting Down the Heating System
With frost protection monitoring
For every heating circuit, select heating program “Standby
mode”.
HNo central heating.
HNo DHW heating.
HFrost protection for the boiler and the DHW tank
is enabled.
For the primary heating circuit (displayed in the header)
Standard menu
1. for the operating program
OK to confirm
For all heating circuits
Extended menu
1.
2. “Heating”
3. Poss. for the required heating circuit.
4. “Operating program”
5. “Standby mode”
Pump exercise function
Circulation pumps are started for 10 sec. once every 24
hours to prevent the pumps from seizing up. This function
is active during all operating programs and during warm
weather shutdown.
Ending the heating program “Standby mode”
Select another heating program.
Without frost protection monitoring
1. Switch the ON/OFF switch OFF.
2. Close the shut-off valves.
3. Isolate the heating system from its main power
supply, e.g. at a separate MCB/fuse or a mains
isolator.
4. Where outside temperatures of below 37°F (3°C)
are anticipated, please take suitable measures to
protect the heating system against frost. If necessary,
contact your heating contractor.
Information on an extended shutdown
HCirculation pumps may seize up if they are not supplied
with power.
HAfter an extended shutdown, it may be necessary to
reset the date and time (refer to page 28).

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Room Temperature
Central Heating
Setting the Operating Program for Central Heating
Setting the reduced room temperature for central heating
(night setback)
Factory setting: 64°F (18°C)
Extended menu
1.
2. “Heating”
3. Poss. for the required heating circuit.
4. “Reduced room temp setpoint”
5. Set the required value.
Central heating to this temperature:
HBetween the time phases for standard heating mode.
HIn the holiday program (refer to page 23).
For all heating circuits
Extended menu
1.
2. “Heating”
3. Poss. for the required heating circuit.
4. “Operating program”
5. For example “Heating and DHW”
For information on the operating programs, refer to
page 16.
Further information can be found in “Terminology” page 40.
Setting the standard room temperature for central heating
Factory setting: 68°F (20°C)
For the primary heating circuit (refer to page 28)
Standard menu
1. for the required value.
2. OK to confirm.
For all heating circuits
Extended menu
1.
2. “Heating”
3. Poss. for the required heating circuit.
4. “Room temp setpoint”
5. Set the required value.
Further information can be found in “Terminology” page 40.
Setting the time program for central heating
Factory setting: One time phase from 0:00 to 24:00 h
for every day of the week.
Extended menu:
1.
2. “Heating”
3. Poss. for the required heating circuit.
4. “Heating time program”
5. Set the required time phases.
Procedure for setting a time program, refer to page 17.
Note: When setting, bear in mind that your heating
system requires some time to heat the rooms
to the required temperature.
Further information can be found in “Terminology” page 40.
Setting the operating program for central heating
For the primary heating circuit (refer to page 28)
Standard menu
1. for the operating program:
“Heating and DHW”
2. OK to confirm.
Time Program