Viessmann Vitotronic 100 HC1, Vitotronic 300-K MW2, Vitotronic 100, HC1, Vitocontrol-S User's Manual And Operating Instructions

Operating Instructions
and User’s Information Manual

Vitodens 200-W, WB2B Series

Multi-boiler system with control units for operation with a constant
temperature and weather-compensated cascade control unit

For operation with natural gas and liquid propane gas

Please file in Service Binder

VITOTRONIC 100, HC1
VITOTRONIC 300-K, MW2S

Certified as a component part

of Viessmann boilers only

Vitotronic 100, HC1

Vitotronic 300-K, MW2S

5728 417 v1.0 09/2010

Safety, Installation and Warranty Requirements

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 the manual subsections).

H Licensed professional heating

contractor

The installation, service, and
maintenance of this equipment must
be performed by a licensed
professional heating contractor.

"

Please see section
entitled “Important
Regulatory and
Installation
Requirements” in the
Installation Instructions.

H 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
Installation Requirements”
in the Installation Instructions.

H Carbon monoxide

Improper installation, 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, service and
maintenance of this
equipment to avoid
formation of carbon monoxide, please
see the Installation Instructions of the
Vitodens 200-W Direct Vent System.

WARNING

Installers must follow local
regulations with respect to
installation of carbon monoxide
detectors. Follow manufacturer’s
maintenance schedule of boiler.

H E

quipment venting

Never operate boiler without an
installed venting system. An improper
venting system can cause carbon
monoxide poisoning.

H Warranty

Information contained in
this and related product
documentation must be
read and followed. Failure

to do so renders warranty
null and void.

dvice to owner

H A

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, shut-down procedure,
and the need for professional service
annually before the heating season
begins.

2

5728 417 v1.0

Table of Contents

Page

General Information / Safety

Safety

Inform Yourself

Start-up / Shutdown

Adjusting the Room
Temperature

About these Instructions 5. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. .

For your Safety 5. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .. . .. . . .. . .. . . .

Getting Started 9. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .. . .. . . .. . .. . . .. .

Overview of Controls and Indicators 10. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . .

Opening the control unit 10. . . . . . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . ..

Opening the programming unit 12. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. .

Select the Heating Circuit - Before Every Setting and

Scanning Operation 14. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .. . .. . . .

Starting the Heating System 15. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . ..

Shutting Down the Heating System 16. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .

Starting a Heating Circuit and DHW Heating 17. . . . . . .. . . .. . .. . ..

Stopping DHW Heating and the Heating Circuit 17. . . . . . .. . . ..

Starting DHW Heating Only 18. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . ..

Stopping DHW Heating 18. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .

Setting a Permanent Room Temperature 19. . . . . . .. . . .. . .. . .. . . .. . .. . .

Selecting the normal room temperature 19. . . . . . .. . . .. . .. . .. . . .. . .. . .

Selecting a reduced room temperature 20. . . . . . .. . . .. . .. . .. . . .. . .. . . ..

Changing the room temperature for a few days 22. . . . . . .. . . .. .

Setting the holiday program 22. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . ..

Selecting DHW Heating

Further Adjustments

Changing the Room Temperature for a

Few Hours Only 23. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .. . .. . . .. . .. . .

Setting energy saving mode 23.. . . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. . .. . . .. .

Setting party mode 23. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .. . .. . . .

Selecting Constant DHW Heating 24. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .

Setting the DHW temperature 24. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . ..

Selecting a time program (switching times) 25. . . . . . .. . . .. . .. . .. . . .

Selecting automatic mode (if required) 26. . . . . .. . .. . . .. . .. . . .. . .. . .. . .

Setting up an individual time program 26. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . ..

Selecting DHW Heating for a Few Hours Only 27. . . . . . .. . . .. . ..

Selecting DHW Heating Only Once 28. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . ..

Setting Time and Date 29. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .. .

Setting the display language 29. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .

Adjusting the display contrast 29. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .

Selecting the Boiler Sequence 30. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. . .. . . .. . .

Actual boiler sequence (standard display) 30. . . . . . .. . . .. . .. . .. . . .. . ..

Controlled boiler sequence 30. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .

Changing the Heating Pattern 31. . . . . . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . ..

Changing the slope and shift 31.. .. . .. . . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .

Modifying the Boiler Heating Characteristics 33. . . .. . .. . . .. . .. . . .

5728 417 v1.0

3

Table of ContentsTable of Contents

Page

Scanning Options

Other Settings

Scanning Temperatures and

Operating Status Information 34.. .. . .. . . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .

Scanning the Fault Display 35. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . .

Scanning Temperatures 36. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . .

Scanning Time Programs 37. . . . . . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . ..

Scanning party or energy saving mode 37. . . . . . .. . . .. . .. . .. . . .. . .. . . ..

Scanning Fault Display 38. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . ..

Selecting the Time Programs 39.. .. . .. . . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .

Rooms are too cold 39. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. .. . . .. . .. . . .

Rooms are too hot 40. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .. . .. . . .. .

There is no hot water 40. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .. . .

The DHW is too hot 41. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .. . .. . .

”OFF” is displayed by the Vitotronic 100 41. . . . . . .. . . .. . .. . .. . . .. . .

Fault symbol flashes in the display of

the Vitotronic 100 41. . . . . . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . .. . .. . . .. . .. .

Fault flashes in the display

of the Vitotronic 300-K, MW2S 41. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .

The service display is shown by the Vitotronic 100 41. . . .

“Service” is displayed by the Vitotronic 300-K, MW2S 41. . .
”Remote control” is displayed by the

Vitotronic 300-K, MW2S 42. . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .

”External control” is displayed by the

Vitotronic 300-K, MW2S 42. . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .

”Central control” is displayed by the

Vitotronic 300-K, MW2S 42. . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .

“Slab curing program” is displayed by the

Vitotronic 300-K, MW2S 42. . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .

“Without function.” is displayed by the

Vitotronic 300-K, MW2S 42. . .. . .. . . .. . .. . .. . . .. . .. . . .. . .. . . .. . .. . . .. . .. . .. . . .. .. . . .

Service Instructions

Additional Information

Service Instructions for Your Heating System 43. . . . . . .. . . .. . .. . .

Lighting and Operating Instructions 44. . . . . . .. . . .. . .. . .. . . .. . .. . . .. . .. . . ..

4

5728 417 v1.05728 417 v1.0

General Information/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.

Warnings draw your attention to the

WARNING

Indicates an imminently hazardous
situation which, if not avoided, could
result in death, 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.

IMPORTANT

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.

For your Safety

H 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.

H Flue gas smell

H 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.

H Dangerous conditions

This symbol indicates that additional,
pertinent information is to be found in
column three.

This symbol indicates that other
instructions must be referenced.

H Maintenance and cleaning

Regular inspection and service by a
qualified heating contractor is important
to the performance of the boiler.
Neglected maintenance impacts on
warranty; regular inspection ensures
clean, environmentally friendly and
efficient operation. We recommend a
maintenance contract with a qualified
heating contractor.

H Technical information

- Deactivate heating equipment.

- Open windows and doors.

- Inform your heating contractor.

5728 417 v1.0

- Deactivate main power immediately.

- Close gas supply valve.

Literature applicable to all aspects of the

Vitotronic 300-K, MW2S:

- Installation Instruction and Service
Instructions

- Operating Instructions and User’s
Information Manual

Additional applicable literature:

- Accessory manuals

5

SafetySafety

For your Safety (continued)

H 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
2034-2002, CSA 6.19-01) should be
installed and maintained in buildings that
contain gas-burning equipment.

Note:

Viessmann does not test any detectors

nd makes no representation regarding

a
any brand or type of detector.

H 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
death. 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.

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.

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.

6

5728 417 v1.05728 417 v1.0

For your Safety (continued)

Safety

Frozen water pipe hazard

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.

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...

H 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..

H Have someone check the building

frequently during cold weather and
call a qualified service agency if
required.

Or...

H Install a reliable remote temperature

sensor that will notify somebody of
freezing conditions within the home.

5728 417 v1.0

7

Safety

For your Safety (continued)

If you notice fire coming from the
appliance, call the fire department
immediately! Do not attempt to extinguish
the fire unless qualified to do so.

WARNING

Fire causes a risk of burns and
explosion!

HHHH Shut down the boiler
HHHH Close fuel shut-off valves
HHHH Use a tested fire extinguisher, class

ABC.

Installation area conditions

WARNING

Incorrect ambient conditions can lead to
damage to the heating system and put
safe operation at risk.

H Ensure ambient temperatures are higher

than 32°F / 0°C and lower than
104°F / 40°C.

H 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 to the right indicates the main,
currently known sources.

H Avoid continuously high levels of

humidity (e.g. through frequent drying of
laundry).

H Never close existing ventilation

openings.

Replacement components, spare and wear
parts

IMPORTANT

Components which are not tested with
the heating system may damage the
heating system, or affect its functions.
Installation or replacement may only be
carried out by a qualified heating
contractor.

Sources of combustion and ventilation air
contaminants

Areas likely to contain contaminants:

H New building construction
H Swimming pools
H Remodelling areas, hobby rooms
H Garages with workshops
H Furniture refinishing areas
H Dry cleaning/laundry areas and

establishments

H Auto body shops
H Refrigeration repair shops
H Metal fabrication plants
H Plastic manufacturing plants
H Photo processing plants
H Beauty salons

Products containing contaminants:

H Chlorine-type bleaches, detergents and

cleaning solvents found in household
laundry rooms

H Paint and varnish removers
H Hydrochloric acid, muriatic acid
H Chlorine-based swimming pool chemicals
H Spray cans containing

chlorofluorocarbons

H Chlorinated waxes and cleaners
H Cements and glues
H Refrigerant leaks
H Calcium chloride used for thawing
H Sodium chloride used for water

softening salt

H Permanent wave solutions
H Adhesives used to fasten building

products and other similar items

H Antistatic fabric softeners used in

clothes dryers

8

5728 417 v1.0

Getting Started...

Inform Yourself

The timer of the control unit switches between ”normal room temperature” and
”reduced room temperature” at the required times.

1. Normal room temperature

for the times you spend at home and
require a comfortably warm room
temperature (e.g. 68ºF / 20ºC).

2. Reduced room temperature

for the times you are away from
home. To save energy,
a lower temperature is typically
selected (e.g. 57ºF / 14ºC).

The timer of the control unit switches domestic hot water production on and off at
the required times.

1. Domestic hot water heating can be

set to take place

during the times you spend at home
and require hot water for your daily
DHW requirements (e.g. for
showering).

2. Domestic hot water heating can be

set not to take place

for the times you spend sleeping, for
example.

Times and duration of the two room
temperatures can be set on the
programming unit of your control.
The temperature settings for both the
”normal room temperature” and
”reduced room temperature” can be
set according to your personal
preference.

Times and duration of the domestic hot
water production period can be set on
the programming unit of your control.

You may select a DHW temperature
setting based on your personal
preference of up to 140ºF / 60ºC.

The domestic hot water recirculation
pump (if installed) ensures that
domestic hot water is readily available
when domestic hot water is drawn.

5728 417 v1.0

9

Inform Yourself

Overview of Controls and Indicators

You can change all settings of your heating system centrally at the Vitotronic 100 of every boiler and at the Vitotronic 300-K,
MW2S.
All possible adjustments / settings are described in these operating instructions. You no longer need the individual operating
instructions for the Vitotronic 100, HC1.
You may also make such adjustments at the remote control, if your system is equipped with one.

Remote control operating
instructions.

Opening the control unit

All boiler controls are located behind the
control unit flap. To open, lift cover A
and pivot control flap B down. On the
inside of the control unit flap B, an
abridged version of these operating
instructions can be found behind a
further flap C. The abridged operating
instructions can be removed with the
flap.

A Cover
B Control unit flap (open to make

adjustments)

C Flap with abridged operating

instructions

5728 417 v1.0

10

Overview of Controls and Indicators (continued)

Vitotronic 100, HC1

Inform Yourself

A

A Pressure gauge
B Fault display (red) (see page 38)
C Operating status display (green)

tr Set boiler water temperature
tw Set DHW temperature
tr+tw Emissions test function

9 Standby mode
w DHW only

B

(only for heating contractors)

C D E F

D Factory default setting
E User interface
F ON / OFF switch (see page 15

and 16)

rw Heating and DHW
/ No function

/ Setting values

Confirmation
Information

D Standard setting (reset)

Symbols in the display

These sysmbols are not permanently displayed, but appear subject to the system version and the operating state.
Flashing displays indicate that modifications can be made.

r Boiler enabled by the

Vitotronic 300-K, MW2S

p Heating circuit pump ON
A Burner ON
S Emissions test ON (only for

service purposes)

E Burner fault
u Time adjustment display

Standard display

The standard display shows the boiler
water temperature.

i Information
U Fault
OFF Boiler is locked out of the cascade
P Scanning hours run, burner

stage 1

PPP Scanning number of burner starts
PPPP Consumption

After completing each adjustment on
the control unit, the display will revert
to the standard display.

5728 417 v1.0

11

Inform Yourself

Overview of Controls and Indicators (continued)

You can change all settings of your heating system centrally at the Vitotronic 100 of every boiler and at the Vitotronic 300-K,
MW2S.
You may also make such adjustments at the remote control, if your system is equipped with one.

Remote control operating
instructions.

Opening the programming unit

The programming unit is located behind
the hinged flap.

A

To open, pull flap from the top edge
forward.

A Hinged flap

12

5728 417 v1.0

Overview of Controls and Indicators (continued)

Boiler sequence

1-23-4

Inform Yourself

Emissions test switch (see pg. 14)

Heating circuit selector buttons (pg.14)

Display window

Normal room temperature (pg. 19)

Heating programs (pg. 17)

Control on/off switch (pg. 15)

Fuse F1

Energy saving mode (pg. 23)

Boiler sequence

1-23-4

Party mode (pg. 23)

Hinged cover of programming unit

Operating status indicator (green)

Fault indicator (red)

Time program for central heating
(pg. 19)

Time program for domestic hot water
heating (pg. 24)

Other symbols (pg. 14)

Time program for DHW recirculation
pump (pg. 24)

Holiday program (pg. 22)

Information

Confirmation

Factory default settings

Setting buttons

5728 417 v1.0

Vitotronic 300-K, MW2S

Domestic hot water temperature
(pg. 24)
Reduced room temperature (pg. 20)

Time/date

Heating curve shift (pg. 31)

Heating curve slope (pg. 31)

Hinged cover of propgramming unit

13

Inform Yourself

Overview of Controls and Indicators (continued)

Boiler sequence

1-23-4

Adjustment of the display window
contrast

Open the hinged cover on the
programming unit, and press and, at
the same time, adjust the contrast with
the or button.

factory default settings

Press this button to reset all altered
values to their factory default settings.
Please note that all altered values are
reset to the factory default settings.

Flashing data

Data flashing in the display window
means that new settings can be
entered.

Basic display

The basic display of the Vitotronic
300-K, MW2S shows the boiler
sequence. The display reverts to
showing the boiler sequence after each
setting is made on the control unit.

Other display symbols

(These are not displayed
continuously, but appear according
to system type and operating status)

e Risk of frost
s Central heating with normal

room temperature

m Central heating with reduced

room temperature

ep
sp
mp Heating circuit pump ON
V Mixing valve open
v Mixing valve closed
w DHW heating enabled
wp DHW pump ON, DHW heating

enabled

+p DHW heating via solar heating

system

A Burner ON
u Time adjustment display
S Emissions test ON
U Fault indicator

Select the Heating Circuit - Before Every Setting and Scanning Operation

Your building may be heated by several independent heating circuits (eg. underfloor heating circuits or radiator circuits).
These are selected at the control unit using keys , or3. The fields adjacent to these keys have been individually
labelled by your heating contractor.
Heating system with a single heating circuit:

One of the keys or and one of the keys rw, w or 9 are illuminated, and you can start the adjustment
immediately.

Heating system with two or three heating circuit:

Choose the required heating circuit before every adjustment and scan.

The heating circuits are individually labelled by your heating contractor.

Vitocontrol-S WB2B

Press
The following keys will be illuminated:

Key , or
Key rw, w or 9
Key g or û (if enabled)

Note:

If you make no adjustments, the key
illumination will extinguish after a short
time.

, or3.

3

14

5728 417 v1.0

Starting the Heating System

Vitotronic 100, HC1

Start-up / Shutdown

1. Check the heating system pressure at

the pressure gauge A. If the system
pressure is below 12 psi / 0.8 bar the
system pressure is too low.

2. For room air dependent operation:

Check whether the ventilation
apertures in the boiler room are open
and unobstructed.

Note:
For room air dependent operation:
This boiler requires fresh air for safe
operation. The boiler must be vented
and supplied with air and exhaust
vents.

3. Open the gas shut-off valve B.

4. Switch ON the power supply, (eg. at

the breaker or electrical disconnect
switch. Energize power / pump
module).

Vitotronic 300-K, MW2S

5. Switch ON / OFF switch “8” C ON

on all control units.
The green indicator (ON indicator)
illuminates on every control unit.
After a short while, the standard
display appears in the display window
of every control unit. Your heating
system and, if installed, your remote
control units (if installed) are now
ready for use.

6. On each Vitotronic 100, “Htg. +

DHW” must be selected, otherwise
the Vitotronic 300-K, MW2S cannot
use the respective boiler to generate
heat.

Check:

rw must be illuminated, otherwise
press rw.

5728 417 v1.0

15

Start-up / Shutdown

Shutting Down the Heating System

If you do not need to use your heating system temporarily, i.e. during a summer holiday, switch all heating circuits of the
Vitotronic 300-K, MW2S to “Standby mode” 9 (see page 17).
If you want to shut down only one boiler of your heating system, switch the relevant Vitotronic 100 to “Standby mode” 9
(see page 17).

Note:

The circulation pumps are briefly started every 24 hours to prevent them from seizing up.

Switch your heating system OFF if you do not need to use it.
We recommend you contact your local heating contractor before and after you shut down your heating system for longer
periods.
Where necessary, your contractor can take certain steps, eg. protecting the system against frost.

Vitotronic 300-K, MW2S

1. Switch ON / OFF switch “8” (see

page 11 and 13) OFF on all control
units.
The green indicator (ON indicator)
extinguishes on every control unit.

2. Close the gas shut-off valve.

3. Switch the main ON / OFF switch on
the Vitotronic 300-K, MW2S to OFF.

Note:

Frost protection is no longer enabled.
All control unit settings are retained.

16

5728 417 v1.0

Starting a Heating Circuit and DHW Heating

Start-up / Shutdown

You want to heat your rooms and have
DHW available.

Press the following keys:

1. / /3for the required heating
circuit.

2.

for “Htg. + DHW”.

Stopping DHW Heating and the Heating Circuit

You do not want to heat any rooms or
have DHW available.

Press the following keys:

/ /3for the required heating

1.
circuit.

2.9for “Standby mode”.

Central heating will be provided with

normal or reduced room temperature
(frost protection) according to the set
time program.
Standard setting:
From 06:00 to 22:00 hrs. normal
room temperature; otherwise reduced
room temperature.

DHW heating (if DHW tank is

installed) is enabled and the DHW
recirculation pump (if installed) is ON
according to the selected time
program.
Standard setting:
From 05:30 to 22:00 hrs. DHW is
boosted to the set temperature, and
the DHW recirculation pump is
switched ON.

The boiler and the DHW tank are

protected against frost.

Central heating is disabled for the

selected heating circuit.

No DHW heating.
The boiler and DHW tank are

protected against frost.

Note:

The recirculation pumps are started
every 24 hours to prevent them from
seizing up.

5728 417 v1.0

17

Start-up / Shutdown

Starting DHW Heating Only

Stopping DHW Heating

You do not want to heat any rooms, but
you want to make DHW available.

Press the following keys:

1. / /3for the required heating
circuit.

2.

You want to heat your rooms, but do
not want to make DHW available.

Press the following keys:

1.

2. for “Htg. + DHW”.

3. Delete the time phases for DHW

for “Htg. + DHW”.

/ /3for the required heating

circuit.

heating (see page 27).
or
Set the DHW temperature to 10°C /
50°F (see page 24).

Central heating is disabled for that

heating circuit.

DHW heating (if DHW tank is

installed) is enabled and the DHW
recirculation pump (if installed) is ON
according to the selected time
program.
Standard setting:
From 05:30 to 22:00 hrs. DHW is
boosted to the set temperature, and
the DHW recirculation pump is
switched ON.

The boiler and the DHW tank are

protected against frost.

Note:

The heating circuit pumps are briefly
started automatically every 24 hours to
prevent them from seizing up.

Central heating will be implemented

with normal or reduced room
temperature (frost protection)
according to the set time program.
Standard setting:
From 06:00 to 22:00 hrs. normal
room temperature; otherwise reduced
room temperature.

No DHW heating.
The boiler and the DHW tank are

protected against frost.

Note:

The DHW primary pump is briefly
started automatically every 24 hours to
prevent it from seizing up.

18

5728 417 v1.0

Setting a Permanent Room Temperature

Observe the following points if your heating circuit should provide central heating:

Adjusting the Room Temperature

1. For the respective heating circuit ,
or3, select “Htg. + DHW”

rw.
Check:
Press
illuminate, otherwise press rw.

2. For each respective heating circuit

temperature (day temperature) with
rotary selector “ts” (see page 19)
and adjust the reduced room
temperature (night temperature) with
tm (see page 20).

, or3; rw must

, or3, select the normal room

3. The timing of when the heating
circuit delivers central heating with
normal or reduced room temperature
depends on the settings of the time
program (four possible time phases)
for each respective day.

If no time phases are selected, central

heating will be enabled for the whole
day at reduced room temperature.

If one or several time phases are

selected, central heating with normal
room temperature will be active for
those times.
Check:

Press , or3.
Press and hold down ur +

simultaneously; a time slot graphic
shows the selected time phases.

For changing the time program, see
page 20.

Selecting the normal room temperature

1. Press , or3; for the required

5728 417 v1.0

heating circuit.

2. Select the required temperature for
the “Normal room temp.” with rotary
selector “ts”.

Normal room temp.

19

Adjusting the Room Temperature

Setting a Permanent Room Temperature (continued)

Selecting the reduced room temperature

Press the following:

1. / /3for the required heating
circuit.

2. tm for “Red. room temp.”; the

current temperature flashes.

Note

When setting the reduced room
temperature to 3°C / 37°F, “Frost

protection” will be displayed.

13. / for the required temperature.

14.

to confirm; the temperature
no longer flashes and is
saved.

Setting time programs (switching times)

For central heating, up to four changes per day between normal and reduced room

temperatue can be programmed (four time phases).

At the factory, time phase 1 is set for every day from 06:00 to 22:00 hrs., i.e.

during that time, all rooms are heated to the normal room temperature.

You can set identical time programs for every day or individual programs for each

day of the week.
When setting time programs, bear in mind that your heating system requires some
time to heat the rooms to the required temperature.

For a sequence of steps to delete a time phase, see page 21.

Press the following keys:

1. Press
heating circuit.

2. ur for “Htg. time program”.

Note

If you want to terminate the time
programming early, press ur again
and confirm with .

13. / until “1-7” is displayed, if

/ /3; for the required

you want to set up the same
time phases for every day

or

14.

/ until “Mo”, “Tu” etc. is

displayed, if you want to set
up different time phases for
the day displayed

Note

If different time phases are set for
individual days and you want to return
to identical time phases for every day,
press when “1-7” is displayed. All
time phases are returned to their original
condition.

15. to confirm; “Htg. timer 1” will

be displayed.

Note

Press
phase.

if you want to skip a time

5728 417 v1.0

20

Setting a Permanent Room Temperature (continued)

Selecting the reduced room temperature (continued)

16. to confirm; “Htg. cycle 1 On”

will then be displayed.

/ for the heating phase starting

17.

point.

18. to confirm; “Htg. cycle 1 Off”

will then be displayed.

19. / for the heating phase end

point.

110. to confirm; “Htg. cycle 2 On”

will then be displayed.

11. Proceed for adjusting the start and
end of heating phases 2 to 4 as
described under steps 7 to 10.

Adjusting the Room Temperature

Press the following keys if you want to
delete a time phase:

1. / /3for the required heating

circuit.

2.ur for “Htg. time program”.

until the required “Htg. cycle

3.

Off” is displayed.

4. until “--:--” is displayed for the

end time.

5. to confirm, until the standard

display (boiler sequence) is
displayed.

5728 417 v1.0

21

Adjusting the Room Temperature

Changing the Room Temperature for a Few Days

The following energy saving options are available for times when you are not at home:

You can switch central heating OFF completely (see “Switching OFF the heating

circuit and DHW heating” on page 17)

or

You can set central heating to minimum energy consumption (eg. to prevent your

houseplants from being damaged by frost). For this, select the “Holiday program”
j.

- When “Htg. + DHW” rw is selected, all heating circuits are heated during the

holiday program with the selected reduced room temperature (see page 20), but
there will be no DHW heating.

- When “DHW only” w has been selected, the holiday program for all heating

circuits will only deliver frost protection for the DHW tank.

Setting a holiday program

The holiday program starts at 00:00 hrs. following the day of your departure and
ends at 00:00 hrs. on the day of your return, i.e. the permanently set time
program is enabled on the day of departure and the day of return.

Note

The control unit is set up so that the holiday program applies to all heating circuits.
If you want to make changes, contact your local heating contractor.

Press the following keys:

1. j for “Holiday program”.

Note

Press j again if you want to
terminate the setting of the holiday
program early.

for “Departure date” (the

2.
current date is displayed).

13. for the date of the required

departure day.

14. to confirm; “Return date” (a

date following that of the
departure day) will be
displayed.

15. for the date of the required

return day.

16.Press to confirm.

7. The room temperature during the
holiday program is the selected
reduced room temperature.
If you want to change that
temperature:

Press ttttmmmm.
Select the required value with

/ .

Press to confirm; the

temperature no longer flashes and
is now saved.

Note

This change generally applies to the
reduced room temperature and must
be modified again, if required, after
the holiday program ends.

Terminating the holiday program

The holiday program terminates

automatically on the day of return.

Press j again, if you want to

terminate the holiday program early
and confirm “Delete? Yes” with

.

22

5728 417 v1.0

Adjusting the Room Temperature

Changing the Room Temperature for a Few Hours Only

The following functions enable you to change the room temperature for a few hours,
without permanently altering your control settings.

To save energy, you can reduce the normal room temperature with “Energy saving

mode” ûûûû .

You want to heat spontaneously with the normal room temperature and make

DHW available. For this, set to “Party mode” g .

Setting energy saving mode

In economy mode, the normal room temperature will be reduced automatically.

Press the following keys:

Setting party mode

1. / /3for the required heating
circuit.

12. ûûûû for “Energy saving mode”.

Central heating will be enabled at any temperature you select (party temperature).
The DHW will be boosted to the set temperature.
The DHW recirculation pump is switched ON.

Press the following keys:

1. / /3for the required heating
circuit.

12. g for “Party mode”; the party

temperature flashes.

13. / for the required temperature,

if you want to change the
room temperature.

Terminating the economy mode

The economy mode ends

automatically with the next
changeover to central heating with
reduced room temperature.

If you want to prematurely terminate

economy mode, press , , or
and ûûûû; the key illumination
extinguishes.

14. to confirm; the temperature

no longer flashes and is
saved.

Terminating party mode

Party mode ends automatically with

the next changeover to central heating
with normal room temperature, but no
later than after 8 hours.

If you want to prematurely terminate

party mode, press , , or3and
g; the key illumination extinguishes.

3

5728 417 v1.0

23

Selecting DHW Heating

Selecting Constant DHW Heating

Note

The control unit is set up so that the setting for DHW heating applies to all heating
circuits. If you want to make changes, contact your local heating contractor.

Setting the DHW temperature

Observe the following points if you want
to enable DHW heating:

1. For the respective heating circuit
or3, select “Htg. + DHW” rrrrwwww

or “DHW only” wwww.
Check:
Press , or3; rrrrwwww or wwww must
be illuminated, otherwise press rrrrwwww
or wwww.

Note

You can select the required DHW
temperature (see page 28).

,

7. When DHW heating with the selected
temperature is enabled for the
heating circuit and when the DHW
recirculation pump (if installed) runs,
depends on the settings of both
programs uw or up (each with
four possible time phases) for the
respective day.
Check:

Press , or3.
Press and hold down uw + or

up+ simultaneously; the set
time phases will then be displayed on
a time slot graphic.

For changing the time program, see
page 25.

Press the following keys:

1. tw for “DHW temp. setpt.”; the

current temperature will flash.

2. ⊕/ for the required temperature.

3. to confirm; the temperature no
longer flashes and is saved.

5728 417 v1.0

24

Selecting Constant DHW Heating (continued)

Setting time programs (switching times)

Heating system without DHW recirculation pump

Note

The control unit is set up so that the setting for DHW heating applies to all heating
circuits. If you want to make changes, contact your local heating contractor.

DHW heating can be enabled / disabled up to four times per day (four time

phases).

Automatic mode (factory default setting)

DHW heating is enabled in parallel to the central heating program of the first
available heating circuit, but starts 30 min. earlier (from 05:30 to 22:00 hrs.).

Individual time programs

You can set up individual time programs if you do not wish to operate in automatic
mode.
You can select identical time programs for every day or individual programs for
each day.

When setting time programs, bear in mind that your heating system requires some
time to heat the DHW tank to the required temperature.
For time programming steps, see pages 26. For a sequence of steps to delete a time
phase, see page 27.

Selecting DHW Heating

Heating system with DHW recirculation pump

Note

The control unit is set up so that the setting for DHW heating applies to all heating
circuits. If you want to make changes, contact your local heating contractor.

The DHW recirculation pump transports hot water through a circuit between the

DHW tank and the draw-off points to deliver DHW to the taps as quickly as
possible.

DHW heating and the DHW recirculation pump can be enabled / disabled up to four

times per day (four time phases).

Automatic mode (factory default setting)

The DHW heating and the DHW recirculation pump are enabled in parallel to the
central heating time program of the first available heating circuit, however
commences 30 min. earlier (from 05:30 to 22:00 hrs.).

Individual time programs

You can set up individual time programs if you do not wish to operate in automatic
mode.
You can select identical time programs for every day or individual programs for
each day.

Also, enabling the DHW recirculation pump is only sensible for those times when

DHW is actually drawn.

The following explains the setting up of a time program using DHW heating uw by
way of an example. Proceed the same for the DHW recirculation pump up time
program.

When setting time programs, bear in mind that your heating system requires some
time to heat the DHW tank to the required temperature.
For time programming steps,see pages 26. For a sequence of steps to delete a time
phase, see page 27.

5728 417 v1.0

25

Selecting DHW Heating

Selecting Constant DHW Heating (continued)

Setting automatic mode (if required)

Setting automatic mode (if required)

In economy mode, the normal room temperature will be reduced automatically.

Press the following keys:

1.

2. uw for “DHW time program”.

Setting up an individual time program

Setting up an individual time program

1. / /3for the required heating

2. uw for “DHW time program”.

3. ⊕/ for “Individual?”, if “Individual?

4.

5. ⊕/ until “1-7” is displayed, if you

/ /3for the required heating

circuit.

circuit.

Note

If you want to terminate the time
program early, press uw again and
confirm with .

is not yet displayed.

to confirm.

want to set up the same time
phase for every day

3. ⊕/ for “Automatic?”, If
“Automatic? is not yet displayed.

4. to confirm.

Note

If different time phases are set
for individual days and you want to
return to identical time phases for
every day, press
displayed.
All time phases are returned to their
original delivered condition.

7. to confirm; “DHW timer 1” will
then be displayed.

Note:

Press ⊕ if you want to skip a time
phase.

when “1-7” is

26

or

6. ⊕/ until “Mo”, “Tu” etc. is
displayed, if you want to set
different time phases for the
displayed day.

8. to confirm; “DHW timer 1 On”
will then be displayed.

9. ⊕/for DHW phase starting point.

10. to confirm; “DHW cycle 1 Off”
will be displayed.

11.⊕/for DHW phase end point.

12.

13. Proceed for setting the start and

to confirm; “DHW cycle 2 On”
will then be displayed.

end of DHW phases 2 to 4 as
described in steps 9 to 12.

5728 417 v1.0

Selecting Constant DHW Heating (continued)

Press the following keys if you want to delete a time phase:

Selecting DHW Heating

1. / /3for the required heating
circuit.

12. uw for “DHW time program”.

3.

until the required “DHW cycle

Off” is displayed.

Selecting DHW Heating for a Few Hours Only

The following functions enable you to heat DHW for several hours, without
permanently altering your control settings. For this, select “Party mode g”. During
party mode, the DHW recirculation pump is active and central heating operates with
the party temperature. Set the party temperature to 4ºC / 39.2ºF, if you require no
central heating (e.g. in summer).

Press the following keys:

1. / /3for the required heating
circuit.

4.  until “--:--” is displayed for
the end time.

5. to confirm, until the boiler
water temperature is
displayed.

12. g f

13. / for the required temperature,

or “Party mode”; the party

temperature flashes.

if you want to change the
room temperature.

14. to confirm; the temperature

no longer flashes and is
saved.

Ending party mode

Party mode ends automatically

with the next changeover to
central heating with normal room
temperature, but no later than
after 8 hours.

If you want to prematurely

terminate party mode, press , or

3

and g; the key illumination

extinguishes.

5728 417 v1.0

27

Selecting DHW Heating Only Once

The following function enables you to heat DHW once, without permanently altering
your settings. For this, select “Party mode” g.

Preconditions:

Not in “Standby mode” 9 and not in the “Holiday program” j
The DHW temperature must be below the set value (see page 24)

/ /3for the required heating

1.
circuit.

12. g for “Party mode”.

3. to confirm; DHW heating
begins.

4. After approximately 10 seconds,

press g again; the key illumination
extinguishes.

Vitotronic 100, HC1

It is possible to simultaneously reset all changed values for the heating circuit to
their factory default settings.
For this, press D.

Vitotronic 300-K, MW2S

It is possible to simultaneously reset all changed values for the heating circuit to
their factory default settings.
For this, press D.

/ /3for the required heating

1.
circuit.

2. D for “factory default setting”.

3. to confirm.

28

5728 417 v1.0

Setting Time and Date

Further Adjustments

Date and time are factory-set and may be changed manually.

Setting the display language

Press the following keys:

1. uý for “Time”.

2. ⊕/ for the required time.

Press the following keys:

1. / /3for the required heating
circuit.

2. “Participant No.” is displayed.

3. to confirm; ”Date” is
displayed.

4. ⊕/ for the required date.

5. to confirm.

3.  for the required language.

Adjusting the display contrast

4. to confirm.

Open the programming unit flap. Press

and simultaneously adjust the

contrast with ⊕ or .

5728 417 v1.0

29

Further Adjustments

Selecting the Boiler Sequence

Actual boiler sequence (standard display)

Your contractor has allocated a boiler
number to each boiler.

The standard display shows the current
boiler sequence:

H The enabled boilers are indicated in

H The boilers listed after the first

H The boilers behind the second hyphen

Controlled boiler sequence

front of the first hyphen.

hyphen are available for heating, but
are not currently required.

are blocked (not available to the
Vitotronic 300-K, MW2S for heating
purposes, eg. because they are in
“Standby mode”).

When your heating system is
commissioned, your contractor selects
the boiler sequence criteria (eg.
permanent boiler lead, last boiler). You
can modify the controlled boiler
sequence within the framework of these
criteria.

Note

It may be impossible to select a
different controlled boiler sequence. The
controlled boiler sequence does not
have to correspond to the actual boiler
sequence, as that is subject to various
factors (eg. faults) and settings made
by your contractor
(eg. temperature-dependent blocking).

Press the following keys:

1. g/û simultaneously for

approximately 2 seconds until
the controlled boiler sequence
appears.

2. ⊕/ for the required controlled
boiler sequence.

3. to confirm.

30

5728 417 v1.0

Changing the Heating Pattern

You can alter the heating characteristics if the room temperature does not meet your
requirements for some time.
You alter the characteristics by changing the slope and shift of the heating curve.
For more information regarding the heating curve, see page 33.
Observe the modified heating characteristics over several days (if possible, await a
major change in the weather) before making further adjustments.
Make short-term room temperature adjustment using rotary selector ts (see page

19) or tm (see page 20).

Changing the slope and shift

For assistance, use the table on page 32.

1. / /3for the required heating

2. n for “Slope”.

Further Adjustments

circuit.

or

3.

4. ⊕/ for the selected value.

5. to confirm.

for “Shift”.

Shift

Note

Setting the heating curve slope or
shift too high or too low will not
result in damage to your heating
system.

5728 417 v1.0

31

Further Adjustments

Changing the Heating Pattern (continued)

Change heating pattern if ... Action Example

... not enough heat is generated in

the cold season

Adjust the slope of the heating curve

upwards by one increment

Slope

... too much heat is generated in the

cold season

... not enough heat is generated at

transitionary times of the year and

in the cold season

... too much heat is generated at

transitionary times of the year and
in the cold season

....not enough heat is generated at

transitionary times of the year but
adequate in the cold season

Adjust the slope of the heating curve

downwards by one increment

Adjust the shift of the heating curve
to a higher value (e.g. +3 K)

Adjust the shift of the heating curve
to a lower value (e.g. -3 K)

Adjust the slope of the heating curve
downwards by one increment, and
the shift to a higher value
(e.g. +3 K)

Slope

Shift

Shift

Slope

... the boiler water temperature is too

high at transitionary times of the
year, but adequate in the cold

season

32

Adjust the slope of the heating curve
upwards by one increment, and the
shift to a lower value (e.g. -3 K)

Shift

Slope

Shift

5728 417 v1.0

Modifying the Boiler Heating Characteristics

The heating curves demonstrates the relationship between the outdoor temperature
and the boiler water or common supply temperature. Put simply: the lower the
outdoor temperature, the higher the boiler water or supply temperature.
The illustrated heating curves apply subject to the following settings:
Heating curve shift = 0

Different shift settings offset the curves parallel in a vertical direction.

Normal room temperature = approx. 20°C / 68°F.

In the factory default settings, the slope is set to 1.4; the shift to 0.

Further Adjustments

Slope

C

The slope of the heating curve is

normally within the range marked

A for underfloor heating systems,
B for modulating heating systems,
C for heating systems with boiler

water temperatures over 75°C /
167 °F.

B

A

Examples

Well insulated house in protected

position (radiator heating):
Slope = 1.2

House in exposed position or

with old heating system
(radiator heating):
Slope = 1.6

5728 417 v1.0

33

Scanning Options

Scanning Temperatures and Operating Status Information

Subject to the connected components and settings you have made, you can scan
the current temperatures and operating conditions.

Press the following keys:

1. for “boiler water

temperature”.

Display
indication

0__01
3__65.

P

003572 h

PPP

030529

PPPP

030585

Description Notes

LON participant number ––

Boiler water temperature ––

°C

Hours run, burner stage 1 Hours run are only approximate

Burner starts ––

Consumption Fuel consumption subject to

2. / for further scanning of the

list.

3.

values

appropriate settings having been
made by the heating contractor

to end scanning.

34

5728 417 v1.0

Scanning the Fault Display

Vitotronic 100, HC1

A

B

C

Scanning Options

D

A Fault display (red)
B Fault number

If your heating system has developed a fault, it will be displayed and indicated by the
flashing red fault indicator A.
You can check the fault code on the display by scanning; then notify your local heating
contractor accordingly. This allows your heating contractor to better prepare for the service
call and may save additional travelling costs.

Press the following keys:

1. ⊕/ to display further faults, if
several faults exist.

2.

Note

The fault message will be displayed
again the following day, if the fault has
not been rectified. The red fault
indicator flashes until the fault has been
rectified.

to acknowledge the fault.

C Fault code
D Fault symbol

To recall fault codes press the following
keys:

1.

2. ⊕/ to display further faults, if

approximately 3 seconds.

several faults exist.

1

5728 417 v1.0

35

Scanning Options

Scanning Temperatures

Subject to the connected components and settings you have made, you can scan
the current temperatures and operating conditions.

To exit the setting mode at any time, press the following keys:

1. / /3for the required heating
circuit.

2.

for “Participant No.”

3.⊕/ for further scanning of the
list.

4.

to end scanning.

Order in which temperatures and operating conditions may be
scanned:

Participant no.
Holiday program - if one has entered

Departure date
Return date

Current Outdoor temperature
Boiler sequence
Common supply temperature - if a

sensor is connected

Boiler water temperature 1-4 (for each

boiler)

Flue gas temperature - if a flue gas

sensor is connected

Sensor aJA - if a sensor is

connected

Sensor aJB - if a sensor is

connected

DHW temperature - DHW temperature
DHW temperature 1 - DHW

temperature, if two tank temperature
sensors are connected

DHW temperature 2 - DHW

temperature, if two tank temperature
sensors are connected

Supply temperature - for heating

circuit with mixing valve

Normal room temperature - actual

value, if a remote control unit is
connected

Solar DHW temperature - DHW

temperature with solar operation

Collector temperature - in conjunction

with a solar heating system

Solar energy - display in kWh, in

conjunction with a solar heating
system

Time
Date
Burner ON / OFF
Output 20 ON / OFF
Output 29 ON / OFF
Output 52 OPEN / CLOSE

0  Close
1 to 99 (%)
100  Open

DHW tank pump ON / OFF
C pump ON / OFF - DHW recirculation

pump

Heating pump ON / OFF - heating

circuit pump

Mixing valve OPEN / CLOSE

0  Close
1 to 99 (%)
100  Open

Solar pump ON / OFF - in conjunction

with a solar heating system

Solar pump ...h - solar circuit pump

hours run, in conjunction with a solar
heating system

Language

36

5728 417 v1.0

Scanning Temperatures (continued)

Scanning time programs

Press the following keys:

1.
circuit.

12. ur+ for heating and DHW time

3. uw+ for DHW time program

4. up+ for DHW recirculation pump

Scanning Options

/ /3for the required heating

program

or

or

time program press and hold
down simultaneously; a time
slot graphic shows the
selected time phases.

Scanning party or energy saving mode

5. For changing the time programs, see
page 20 and 25.

Press keys , or3; the selected
key and the key of the active program
will be illuminated (see page 14).

5728 417 v1.0

37

Scanning Options

Scanning the Fault Display

Vitotronic 300-K, MW2S

Fault

DBG-

2

d5

A

A Fault display (red)
B Fault number

B CD

C Fault code
D Fault symbol

If your heating system has developed a fault, it will be displayed and indicated by the
flashing red fault indicator A. You can check the fault code on the display by scanning;
then notify your local heating contractor accordingly. This allows your heating
contractor to better prepare for the service call and may save additional travelling costs.

Press the following keys:

To recall fault codes press the following
keys:

1. for troubleshooting.

1.

approximately 2 seconds.

2. ⊕/ to display further faults, if
several faults exist.

3.

to “Acknowledge” all fault
messages.

4. ⊕/ for “Yes” or “No”.
With “Acknowledge? Yes” you
confirm that you have noticed

2. ⊕/ for the acknowledged fault.

Note

If the fault has not been rectified, the
fault message will be redisplayed at
07:00 hrs. the following day.
The red fault indicator flashes until the
fault has been rectified.

the fault.

5. to confirm.

1

38

5728 417 v1.0

Scanning Options

Selecting the Time Programs

Rooms are too cold

Cause Remedy

The heating system is switched OFF,
ON indicator “8” (green) OFF

Control unit or remote control incorrectly
adjusted

Only when operating with DHW tank:
DHW priority (wp is displayed)

No fuel With LPG:

Faults at the Vitotronic 100:
Fault symbol ”U” is displayed and the red fault

indicator flashes (see page 38)

Fault at the Vitotronic 300-K, MW2S:
”Fault” is displayed and the red fault indicator

flashes (see page 38)

Burner fault:
“EEEE” is displayed by the corresponding Vitotronic

100, and the red fault indicator of the control unit
flashes

Remote control fault Contact your local heating contractor

Low water Contact your local heating contractor

Faulty ventilation air or flue gas system Contact your local heating contractor

Mixing valve motor faulty Adjust the mixing valve manually and call your local heating contractor

Switch system ON / OFF switch “8” ON (see page 15)
Switch ON the main power supply to all boilers and Vitotronic 300-K,

MW2S, if installed (outside the boiler room)

Check the fuse in the Vitotronic 300-K, MW2S (F1)

Check and correct settings, if required:
Room temperature “Htg. + DHW” must be selected on all

Vitotronic 100

The heating circuit must be switched ON
Room temperature (see page 19)

Time (see page 29)
Characteristics of the heating circuits at the Vitotronic 300-K, MW2S

(see page 31)

Wait until the DHW tank has been heated up (p disappears from the
display)

Check the fuel stock and re-order, if required

With natural gas:

Open the gas shut-off valve or check with your gas supply utility, if
required

Check the type of fault and notify your local heating contractor

Check the type of fault and notify your local heating contractor

Press burner fault reset “EEEE” - if that attempt to start also fails,
contact your local heating contractor

5728 417 v1.0

39

Scanning Options

Selecting the Time Programs (continued)

Rooms are too hot

Cause Remedy

Control unit control incorrectly adjusted Check and correct settings, if required:

The heating circuit must be switched ON
Room temperature (see page 19)
Time (see page 29)
Boiler heating characteristics (see page 31)

Faults at the Vitotronic 100:
Fault symbol ”U” is displayed and the red fault

indicator flashes (see page 38)

Fault at the Vitotronic 300-K, MW2S:
”Fault” is displayed and the red fault indicator

flashes (see page 38)

Emissions test switch “S” is set to “h” Set emissions test switch “S” to “a”

There is no hot water

Check the type of fault (see page 38) and notify your local heating con­tractor

Check the type of fault (see page 38) and notify your local heating con­tractor

Cause Remedy

The heating system is switched OFF,
ON indicator “8” (green) is OFF

Control unit control incorrectly adjusted Check and correct settings, if required:

No fuel See page 39

Faults at the Vitotronic 100:
Fault symbol ”U” is displayed and the red fault

indicator flashes (see page 38)

Fault at the Vitotronic 300-K, MW2S:
”Fault” is displayed and the red fault indicator

flashes (see page 38)

Burner fault:
“EEEE” is displayed by the corresponding Vitotronic

100, and the red fault indicator of the control unit
flashes

Remote control fault Contact your local heating contractor

Low water Contact your local heating contractor

Faulty ventilation air or flue gas system Contact your local heating contractor

DHW primary pump is faulty Contact your local heating contractor

Switch system ON / OFF switch “8” ON (see page 15).
Switch ON the main power supply to all boilers and Vitotronic 300-K,

MW2S, (outside the boiler room)

Check the fuse in the Vitotronic 300-K, MW2S (F1)

The heating circuit must be switched ON (see page 15)
Room temperature (see page 19)
Time (see page 29)
Boiler heating characteristics Vitotronic 300-K, MW2S (see page 31)

Check the type of fault and notify your local heating contractor

Check the type of fault and notify your local heating contractor

Press burner fault reset “EEEE” - if that attempt to start also fails, contact
your local heating contractor

40

5728 417 v1.0

Scanning Options

Selecting the Time Programs (continued)

The DHW is too hot

Cause Remedy

Control unit control incorrectly adjusted Check and correct the DHW temperature, if required (see page 24)

Sensor fault Contact your local heating contractor

Emissions test switch “S” is set to “h” Set emissions test switch “S” to “a”

”OFF” is displayed by the Vitotronic 100

Cause Remedy

Boiler is locked out of the cascade Ask your local heating contractor to reset your boiler

Fault symbol “UUUU” flashes in the display of the Vitotronic 100

Cause Remedy

Fault at the respective Vitotronic 100 Check the type of fault (see page 38) and notify your local heating

contractor

“Fault” flashes in the display of the Vitotronic 300-K, MW2S

Cause

Heating system fault Check the type of fault (see page 38) and notify your local heating

The service display is shown by the Vitotronic 100

Cause Remedy

The time for a service of the corresponding boiler
has been reached. The following service displays
may be shown:

 035510 h (hours run)
 12 u (interval)

”Service” is displayed by the Vitotronic 300-K, MW2S

Remedy

contractor

Arrange a service with your local heating contractor

Note

A service display is not a fault. The boiler remains operational.

Cause Remedy

The time for a service of a boiler has been
reached

5728 417 v1.0

Arrange a service with your local heating contractor

41

Scanning Options

Selecting the Time Programs (continued)

“Remote control” is displayed by the Vitotronic 300-K, MW2S

Cause Remedy

A remote control is connected to the heating
circuit

”External control” is displayed by the Vitotronic 300-K, MW2S

Cause Remedy

The heating program selected at the control unit
was changed over by an external device

”Central control” is displayed by the Vitotronic 300-K, MW2S

Cause Remedy

The settings or the operating and holiday program
will be adopted from that heating circuit, for
which “Central control” has been selected

Make adjustments or carry out scanning at the remote control (see
separate operating instructions)

No action required. The heating program changeover was manually
selected

----

”Slab curing program” is displayed by the Vitotronic 300-K, MW2S

Cause

The slab curing function is enabled Wait until this function has terminated

“Without function” is displayed by the Vitotronic 300-K, MW2S

Cause Remedy

No function has been allocated to the key you
pressed, or the function can only be adjusted at
your remote control

Remedy

---

42

5728 417 v1.0

Service Instructions for Your Heating System

Viessmann strongly recommends inspection/service of the boiler and the system
by a licensed professional heating contractor once a year.

Before the heating season begins, the boiler with its burner(s) and direct vent
system should be serviced by a qualified heating contractor. Service contracts may
be established through gas suppliers or other licensed contractors in your area.

Regular inspection/service ensures trouble-free, energy-efficient and
environmentally friendly heating activity of your heating system.

Service Instructions

Boiler

All boilers must be cleaned on a regular
basis as debris build-up will result in
increased flue gas temperature, and
thus in increased energy consumption.

Domestic hot water storage tank

Inspection and (if necessary) cleaning of
the tank must take place within 2 years
of initial start-up and as required
thereafter.
Cleaning of the inside surfaces of the
DHW storage tank, including DHW
connections, may only be performed by
a licensed professional heating
contractor.

Vitocell 100:
Viessmann recommends an annual
inspection, and replacement if required,
of the consumable anode by a licensed
professional heating contractor.
The inspection can be carried out during
regular operation of the heating system;
shut-down is not required.
The heating contractor measures the
protective current with an anode tester.

Notes on operation:

H Ensure boiler room and boiler

are clean.

H Regularly check heating system

pressure on the pressure gage:
If the needle of pressure gage is
below 12 psig, the system pressure
is too low; in this case, please
contact your heating contractor.

IMPORTANT

If the domestic cold water supply to the
hot water storage tank has a water
treatment device (water softener)
installed, ensure its proper working
condition is checked regularly by your
heating contractor.

The same applies if a dirt trap or a
water filter is installed in the domestic
cold water supply. Any of these devices
installed in the domestic cold water
supply must be flushed out and serviced
on a regular basis.

5728 417 v1.0

Drinking water filter (if installed)
For hygienic reasons
H replace filter element every

6 months on filters which cannot be
flushed back, and perform a visual
inspection every 2 months,

H flush back reversible flow filters

every 2 months.

Safety valve (DHW tank)

The safety valve function should be
checked every six months by venting,
either by the system user or the local
heating contractor. The valve seat may
become contaminated.

Please follow manufacturer’s

instructions.

Please follow manufacturer’s
instructions.

43

Additional Information

Lighting and Operating Instructions

FOR YOUR SAFETY READ BEFORE OPERATING

W A R N I N G: If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal injury or loss of life.

A. This appliance does not have a pilot. It is equipped

with an ignition device which automatically lights
the burner. Do not

B. BEFORE OPERATING smell all around the appliance

area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle
on the floor.
WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch; 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.

try to light the burner by hand.

OPERATING INSTRUCTIONS

1. STOP! Read the safety information above on this
label.

2. Set thermostat or other operating control to lowest
setting.

3. Turn off all electric power to the appliance.

C. Use only your hand to push in or turn the gas

control knob. Never use tools. If the knob will not
push in or turn by hand, don’t try to repair it, call a
qualified service technician. Force or attempted
repair may result in a fire or explosion.

D. Do not use this appliance if any part has been under

water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
which has been under water.

5. Close main gas shut-off valve.

6. Wait five (5) minutes to clear out any gas. Then
smell for gas, including near the floor. If you smell
gas, STOP! Follow ”B” in the safety information
above on this label. If you don’t smell gas, go to the
next step.

4. This appliance is equipped with an ignition device
which automatically lights the burner. Do not
light the burner by hand.

try to

Manual gas shutoff

Closed

Open

TO TURN OFF GAS TO APPLIANCE

1. Set thermostat or other operating control to lowest
setting.

2. Turn off all electric power to the appliance if service
is to be performed.

3. Close main gas shut-off valve.

7. Open main gas shut-off valve.

8. Turn on all electric power to the appliance.

9. Set thermostat or other operating control to
desired setting.

10. If the appliance will not operate, follow the
instructions ”To Turn Off Gas To Appliance” and
call your service technician or gas supplier.

44

5728 417 v1.0

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5728 417 v1.0

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5728 417 v1.0

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5728 417 v1.0

Quick Reference

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°C °F

-40 -40

-35 -31

-25 -13

-20 -4

-18 0

-16 +3

-14 +7

-12 +10

-10 +14

-9 +16

-8 +18

-7 +19

-6 +21

-5 +23

-4 +25

-3 +27

-2 +28

-1 +30
0 +32

+1 +34
+2 +36
+3 +37
+4 +39
+5 +41
+6 +43
+7 +45
+8 +46

+9 +48
+10 +50
+12 +54
+14 +57
+16 +61
+18 +64
+20 +68
+25 +77
+30 +86
+35 +95
+40 +104
+50 +122
+60 +140
+70 +158
+80 +176
+90 +194

+100 +212
+110 +230

Printed on environmentally friendly

(recycled and recyclable) paper.

Viessmann Manufacturing Company (U.S.) Inc.
45 Access Road
Warwick, Rhode Island D 02886 D USA
Tel. [phone] D Fax [phone]
www.viessmann-us.com D [e-mail]

48

Viessmann Manufacturing Company Inc.
750 McMurray Road
Waterloo, Ontario D N2V 2G5 D Canada
Tel. [phone] D Fax [phone]
www.viessmann.ca D [e-mail]

5728 417 v1.0