Viessmann VITOTRONIC 300 User manual

for use by heating contractor
Please file in Service Binder
5693 980 - 02 02/2015
Operating Instructions
Certified as a component
part for Viessmann boilers
VITOTRONICr300
Vitotronic 300
Type GW5B
Digital boiler control unit
Read and save these instructions
for future reference.
IMPORTANT

Vitotronic 300, GW5B Operating
5693 980 - 02
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”.
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.
Safety Terminology
Take note of all symbols and notations intended to draw attention to potential hazards or important product
information. These include ”WARNING” and ”CAUTION”. See below.
WARNING
Indicates an imminently hazardous situation which,
if not avoided, could result in substantial product /
property damage, serious injury or loss of life.
CAUTION
Indicates an imminently hazardous situation which,
if not avoided, may result in minor injury or product /
property damage.
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.
2

Page
Vitotronic 300, GW5B Operating
3
5693 980 - 02
Table of Contents
Safety
Introduction
Operation
Start-up/Shutdown
Central Heating
Comfort and Energy Saving Functions
DHW Heating
Safety, Installation and Warranty Requirements..............2
Product documentation...........................................2
Licensed professional heating contractor...................2
Advice to owner....................................................2
Warranty...............................................................2
Safety Terminology....................................................2
Commissioning......................................................5
Your System is Preset at the Factory.............................5
Controls....................................................................6
Opening the control unit.......................................6
Programming unit.................................................6
Menu........................................................................7
Standard menu.....................................................7
Selecting the set room temperature..........................7
Setting the heating program..................................7
Symbols on display...............................................7
Extended menu.....................................................8
How to use the Controls..............................................8
Starting the Heating System....................................10
Shutting Down the Heating System.............................11
With frost protection monitoring............................11
For the heating circuit displayed in the header.........11
For the other heating circuits................................11
Ending the heating program “Standby mode”..........11
Without frost protection monitoring (shutdown)......11
Information on a prolonged shutdown....................11
Required Settings (Central Heating).............................12
Selecting a Heating Circuit.........................................12
Setting the Room Temperature...................................13
Setting the room temperature for standard
heating mode.....................................................13
For the heating circuit displayed in the header.........13
For the other heating circuits................................13
Setting the room temperature for reduced
heating mode (night setback)................................13
Setting the Heating Program for Central Heating...........14
Setting the Time Program for Central Heating...............14
Changing the Heating Curve.......................................16
Stopping Central Heating...........................................16
Select Comfort Function “Party Mode”........................17
Select Comfort Function “Economy Mode”..................18
Select Energy Saving Function “Holiday Program”........19
Required Settings (DHW Heating)................................20
Setting the DHW Temperature....................................20
Setting the Heating Program for DHW Heating..............20
Setting the Time Program for DHW Heating.................21

Table of Contents
4
Page
5693 980 - 02
Vitotronic 300, GW5B Operating
Further Adjustments
Scanning
Troubleshooting
Maintenance
Appendix
Stopping DHW Heating..............................................23
Setting the Display Contrast.......................................23
Setting the Display Brightness....................................23
Entering the Names for the Heating Circuits.................24
Changing the Standard Menu.....................................24
Setting the Time and Date.........................................25
Language Selection...................................................25
Setting the Temperature Unit (°C/°F)..........................25
Restoring Factory Settings.........................................25
Scanning Information.................................................26
Scanning in conjunction with solar thermal systems....26
Resetting data.....................................................26
Scanning Service Messages........................................27
Display in standard menu.....................................27
Display in extended menu.....................................27
Calling up an acknowledged fault message.............27
Scanning Fault Messages...........................................28
Display in standard menu.....................................28
Display in extended menu.....................................28
Calling up an acknowledged fault message.............28
Burner Fault.............................................................29
Emissions Test Mode................................................29
Ending emissions test mode..................................29
Rooms are Too Cold.................................................30
Rooms are Too Hot...................................................31
There is No Hot Water...............................................31
The DHW is Too Hot.................................................32
“Central Control” is Displayed....................................32
“
“ Flashes and “Fault” is Displayed..........................32
“ ” Flashes and “Service” is Displayed.......................32
“Controls Locked Out” is Displayed.............................32
“External Hook-up” is Displayed..................................32
“External Program” is Displayed..................................32
Maintenance............................................................33
Menu Overview........................................................34
Terminology............................................................37

5
5693 980 - 02
Commissioning
Introduction
The control units are factory-set for central heating and
DHW heating:
Your heating system is therefore ready for use:
Central heating
HBetween 06:00 and 22:00 h, the rooms are heated
to 68° F (20° C) “Set room temperature” (standard
heating mode).
HBetween 22:00 and 06:00 h, the rooms are heated to
37.5° F (3° C) “Set red. room temp” (reduced heating
mode, frost protection).
HYour heating contractor can make further settings for
you during commissioning.
You can change any settings individually at any time to
suit your requirements (see chapter “Central heating”).
DHW heating
HBetween 05:30 and 22:00 h, DHW is heated to
122° F (50° C) “Set DHW temperature”.
Any installed DHW circulation pump is on.
HBetween 22:00 and 05:30 h, the DHW tank
temperature will not be reheated. Any installed DHW
circulation pump is off.
HYour heating contractor can make further settings for
you during commissioning.
You can change any settings individually at any time
to suit your requirements (see chapter “DHW heating”).
As the user of new combustion equipment, you may
be obliged to notify your local service technician of the
installation [check local regulations]. Your local service
technician will also inform you [where appropriate] about
work he may be required to perform on your combustion
equipment (e.g. regular checks, cleaning).
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.
Your System is Preset at the Factory
Frost protection
HYour boiler, heating circuits and DHW tank are
protected against frost.
Wintertime/summertime changeover
HThis changeover is automatic.
Time and date
HThe day and time were set by your heating contractor
during commissioning.
Power failure
HAll data is saved if there is a power failure.
Terminology
To provide you with a better understanding of the
functions of your control unit, the appendix contains
the chapter “Terminology” (see page 37).
Vitotronic 300, GW5B Operating

Vitotronic 300, GW5B Operating
5693 980 - 02
6
Operation
Menu “Help”
You can view a short guide giving an explanation of the
controls and information about heating circuit selection
(see page 34).
Call up the short guide as follows:
HIf the screen saver is active (see page 8):
Press ?
HFrom anywhere in the menu:
Press until the standard menu is shown
(see the following chapter).
Press ?
Controls
You can change any settings on your heating system
centrally at the programming unit of the control unit.
If remote controls are installed in your rooms, you can
also adjust the settings at the remote control units.
Opening the control unit
The programming unit is located behind the cover flap.
Brief operating instructions can be found on the back
of the cover flap.
To open, pull the flap from the top edge forward.
See remote control Operating Instructions
Legend
ACover flap
Programming unit
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.
? To call up additional information regarding the
selected menu option.
Calls up the extended menu.

7
5693 980 - 02
Vitotronic 300, GW5B Operating
Menu
Operation
There are two control levels available, the “Standard
menu” and the “Extended menu”.
The menu overview can be found on page 34.
Standard menu
Call up the standard menu as follows:
HIf the screen saver is active (see page 8). Press OK.
HFrom anywhere in the menu:
Keep pressing until the standard menu appears.
In the standard menu, you can adjust and scan the most
frequently used settings for the heating circuit shown in
the header:
HSet room temperature
HHeating program
Selecting the set room temperature
Press the following keys:
for the required value.
OK to confirm.
Setting the heating program
Press the following keys:
for the required heating program.
OK to confirm.
Note: The settings for the displayed heating circuit
can also be found in the Extended menu.
The settings for any other connected heating
circuits can only be found in the extended menu.
Symbols on display
These symbols are not always displayed, but appear
subject to the system version and the operating state.
Heating programs:
9 Standby mode with frost protection monitoring
w Only DHW
w Heating and DHW
Legend
AHeader (shows the heating program for the heating
circuit displayed D)
BCurrent outside temperature
CSet room temperature
DOnly if there is more than one heating circuit:
Heating circuit selected for operation in the standard
menu (see chapter “Changing the standard menu” on
page 24)
Displays
HC1 (2, 3) If your heating system has 2 or 3 heating
circuits:
To display the heating circuit selected in the
standard menu
To change this, see page 24.
 Frost protection monitoring
 Central heating with standard room
temperature
 Central heating with reduced temperature
Party mode enabled
Economy mode enabled
In conjunction with a solar thermal system:
Solar circuit pump running
A Burner in operation
Messages
Service message
  Fault message

Vitotronic 300, GW5B Operating
5693 980 - 02
8
Extended menu
Call up the extended menu as follows:
HIf the screen saver is active:
Press OK and then .
HFrom anywhere in the menu:
Press .
Note: Your heating contractor can block the use of the
extended menu. In this case, you can only scan
fault and service messages.
In the extended menu, you can adjust and scan the
settings from the control unit’s range of functions used
less frequently, e.g. time programs and holiday programs.
The menu overview can be found on page 34.
Operation
Menu (continued)
1. Press OK. This takes you to the standard menu
(see page 7).
2. Press . This takes you to the extended menu
(see above).
The selected menu option is highlighted in white.
The dialogue line E(see diagram) then shows the
necessary instructions.
The following diagram shows how to make settings with
different dialogue lines, using the set room temperature
setting as an example.
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.
Legend
BCurrent outside temperature
CSet room temperature
Legend
EDialogue line
How to Use the Controls

9
5693 980 - 02
Vitotronic 300, GW5B Operating Operation
How to Use the Controls (continued)

Vitotronic 300, GW5B Operating
5693 980 - 02
10
Start-up/Shutdown
Starting the Heating System
Ask your heating contractor about the following:
HBoiler and relevant control unit type
HLevel of the required system pressure
HPosition of the pressure gauge, shutoff valve,
gas shut-off valve, ventilation apertures
1. Check the heating system pressure at the pressure
gauge. The system pressure is too low top up the
water or notify your local heating contractor.
2. Open the shut-off valves in the oil lines (at the tank
and filter) or open the gas shut-off valve.
3. Switch ON the power supply,
e.g. at a separate MCB/fuse or a mains isolator.
4. Switch the ON/OFF switch ON. After a short time,
the standard menu is displayed (see page 7) and the
green ON indicator illuminates. Your heating system
and, if installed, your remote control unit are now
ready for use.
Legend
AON indicator (green)
BFault indicator (red)
CEmissions test switch
(only for service purposes)
DON/OFF switch
EFuses

11
5693 980 - 02
Vitotronic 300, GW5B Operating Start-up/Shutdown
Shutting Down the Heating System
With frost protection monitoring
For every heating circuit, select the heating program
“Standby mode”.
HNo central heating.
HNo DHW heating.
HFrost protection for the heating circuits and the DHW
tank is active.
For the heating circuit displayed in the header
Standard menu
1. for the heating program
“Standby mode” (frost protection monitoring).
2. OK to confirm.
For the other heating circuits
Extended menu
1.
2. “Heating”
3. Select the heating circuit, if necessary (see page 12).
4. “Heating program”
5. “Standby mode” (frost protection monitoring)
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 (shutdown)
1. Switch the ON/OFF switch (see page 10) OFF .
2. Close the shut-off valves in the oil lines (at the
tank and filter) or close the gas shut-off valve.
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 37.5° F
(3° C) are anticipated, please take suitable
measures to protect the heating system against
frost. If necessary, contact your heating contractor.
HCirculation pumps may seize up as they are not
supplied with power.
HIt may be necessary to reset the date and time
(see page 25).

Vitotronic 300, GW5B Operating
5693 980 - 02
12
Central Heating
Required Settings (Central Heating)
If you want central heating, check the following points:
HHave you selected the heating circuit?
For settings, see the next chapter.
HHave you set the required room temperature?
For settings, see page 13.
HHave you selected the correct heating program?
For settings, see page 14.
HHave you set the required time program?
For settings, see page 14.
Selecting a Heating Circuit
The heating of all rooms can, if necessary, be split over
several heating circuits.
In the case of heating systems with several heating
circuits, for all central heating settings, first select
the heating circuit where you want to make a change.
This selection is not possible in heating systems with
only one heating circuit.
Example:
H“Heating circuit 1” is the heating circuit for the offices
on the ground floor.
H“Heating circuit 2” is the heating circuit for the offices
on the first floor.
The heating circuits are marked at the factory as “Heating
circuit 1” (HC1), “Heating circuit 2” (HC2) and “Heating
circuit 3” (HC3).
If you or your heating contractor have renamed the
heating circuits (e.g. as “Ground floor” etc.), the name
is displayed instead of “Heating circuit ...” (see page 24).
Extended menu
1.
2. “Heating” (see display example)
3. for the required heating circuit.
Note:In the extended menu, you can scan the selected
heating program under “Information” (see chapter
“Scanning information”, “Heating circuit ...” group).

13
5693 980 - 02
Vitotronic 300, GW5B Operating Central Heating
Selecting a Heating Circuit (continued)
Setting the Room Temperature
Setting the room temperature for reduced heating mode
(night setback)
Factory setting: 37.5° F (3° C)
Extended menu
1.
2. “Heating”
3. Select the heating circuit, if necessary (see page 12).
4. “Set reduced room temperature”
5. Set the required value.
The rooms are heated to this temperature:
HBetween the time phases for standard heating mode
(see page 14).
HIn the holiday program (see page 19).
Setting the room temperature for standard heating mode
Factory setting: 68° F (20° C)
For the heating circuit displayed in the header
Proceed as described (see page 7).
For the other heating circuits
Extended menu
1.
2. “Heating”
3. Select the heating circuit, if necessary (see page 12).
4. “Set room temperature”
5. Set the required value.
Note: If you return to the standard menu with, the
header will again display “HC1” (see page 7).
For changes to the heating circuit display in
the standard menu, see page 24.

Vitotronic 300, GW5B Operating
5693 980 - 02
14
Central Heating
Setting the Heating Program for Central Heating
Factory setting: “Heating and DHW”
For the heating circuit displayed in the header
Proceed as described on page 7.
For the other heating circuits
Extended menu
1.
2. “Heating”
3. Select the heating circuit, if necessary (see page 12).
4. “Heating program”
5. “Heating and DHW”
HThe time program for central heating is made up of time
phases. One time phase from 6:00 to 22:00 h for every
day of the week is set at the factory.
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.
HIn the extended menu, you can scan the current time
program under “Information” (see chapter “Scanning
information”, “Heating circuit ...” group).
HThe rooms of the selected heating circuit are heated
in accordance with the room temperature and time
program settings.
HDHW is reheated in accordance with the set DHW
temperature and time program (see chapter “DHW
heating”).
Setting the Time Program for Central Heating

15
5693 980 - 02
Vitotronic 300, GW5B Operating
Extended menu:
1.
2. “Heating”
3. Select the heating circuit if necessary.
4. “Heating time program”
5. Select part of the week or a day.
6. Select the time phase !,?, §or $.
7. Set the start and end points for the relevant time
phase.
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.
Central Heating
Setting the Time Program for Central Heating (continued)
Example shown:
HTime program for Monday to Friday (“Mo-Fr”)
HTime phase !: From 05:00 to 08:30 h
HTime phase ?: From 16:30 to 23:00 h
Deleting a time phase
Set the time for the end point to the same time that was
set for the start point. The display shows the selected
time phase ”- - : - -”.
Example:
You want to set the same time program for every day
except Monday:
Select the period “Monday–Sunday” and set the time
program.
Then select “Monday” and set the time program for this.

Vitotronic 300, GW5B Operating
5693 980 - 02
16
Central Heating
Stopping Central Heating
For the other heating circuits
Extended menu
1.
2. “Heating”
3. Select the heating circuit, if necessary (see page 12).
4. “Heating program”
5. “Only DHW” (summer mode, no central heating)
or
“Standby mode” (frost protection monitoring)
For the heating circuit displayed in the header
Standard menu
1. for the heating program “Only DHW”
(summer mode, no central heating)
or
“Standby mode” (frost protection monitoring).
2. OK to confirm.
Changing the Heating Curve
Your system’s heating characteristics are affected by the
slope and the shift of the selected heating curve. Further
information about the heating curve can be found under
“Terminology” (see page 37).
Factory setting:
HSlope: 1.4
HHeating curve shift: 0
HStandard room temperature (set value): 68° F (20° C)
HReduced room temperature (set value): 37.5° F (3° C)
Extended menu:
1.
2. “Heating”
3. Select the heating circuit, if necessary (see page 12).
4. “Heating curve”
5. “Slope” or “Shift”
Note: Tips on when and how to change the heating
curve slope and shift are displayed by pressing
?
6. Set the required value.
Example:
Change the heating curve slope to 1.5. A graph clearly
shows the change in the heating curve as soon as you
alter the value for slope or shift.
Depending on various outside temperatures (shown on
the horizontal axis), the assigned set supply temperatures
for the heating circuit are highlighted white.

17
5693 980 - 02
Vitotronic 300, GW5B Operating Comfort and Energy Saving Functions
Selecting Comfort Function “Party Mode”
With this function, you can change the room temperature
for several hours, e.g. if guests unexpectedly stay longer
in the evening. You do not have to change any existing
control settings. With this function, DHW is reheated to
the selected set temperature.
Extended menu
1.
2. “Heating”
3. Select the heating circuit, if necessary (see page 12).
4. “Party mode” (see display example)
5. Set the room temperature required during party mode.
(see display example)
Display in the standard menu
Note: The display of the selected set room temperature
does not change.
HThe rooms are heated to the required temperature.
HDHW is reheated to the selected set temperature.
HThe DHW circulation pump is switched ON (if installed).
Ending party mode
HAutomatically when the system switches to standard
heating mode in accordance with the time program.
or
HIn the extended menu, set “Party mode” to “OFF”.

Vitotronic 300, GW5B Operating
5693 980 - 02
18
Comfort and Energy Saving Functions
Selecting Energy Saving Function “Economy Mode”
To save energy, you can reduce the room temperature
in standard heating mode. For example, if you leave your
home for a few hours.
Extended menu
1.
2. “Heating”
3. Select the heating circuit, if necessary (see page 12).
4. “Economy mode” (see display example)
Note: The display of the selected set room temperature
does not change.
Ending economy mode
HAutomatically when the system switches to reduced
heating mode in accordance with the time program.
or
HIn the extended menu, set “Economy mode” to “OFF”.
Display in the standard menu

19
5693 980 - 02
Vitotronic 300, GW5B Operating
The holiday program has the following effect on the
heating circuits and DHW heating:
HCentral heating:
- For heating circuits in the heating program “Heating
and DHW”:
In these heating circuits, the rooms are heated to the
selected reduced room temperature (see page 13).
- For heating circuits in the heating program “Only
DHW”:
No central heating in these heating circuits.
If the heating program “Only DHW” is selected for
all heating circuits, frost protection monitoring is only
enabled for the boiler and DHW tank.
HDHW heating:
DHW heating is switched OFF; frost protection for the
DHW tank is active.
To save energy, for example over long holidays, you can
activate the “Holiday program”.
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.
Comfort and Energy Saving Functions
Selecting Energy Saving Function “Holiday Program”
The holiday program starts at 00:00 h the day following
your departure and ends at 00:00 h on the day of your
return. This means the selected time program is active
on the days of departure and return (see page 14).
Extended menu:
1.
2. “Heating”
3. “Holiday program” (see display example)
4. Set the required departure and return dates.
(see display example)
Display in the standard menu
The enabled holiday program is not displayed in the
standard menu.
Display in the extended menu
In the extended menu, you can scan the selected holiday
program under “Information” (see chapter “Scanning
information”, “Heating circuit ...” group).
Terminating or deleting a holiday program
Extended menu
1.
2. “Heating”
3. “Holiday program”
4. “Delete program”

Vitotronic 300, GW5B Operating
5693 980 - 02
20
DHW Heating
Required Settings (DHW Heating)
Note: The control unit is set up so that DHW heating
applies to all heating circuits. If you want to make
changes, contact your local heating contractor.
Setting the DHW Temperature
Setting the Heating Program for DHW Heating
Extended menu
1.
2. “Heating”
3. Select the heating circuit, if necessary (see page 12).
4. “Heating program”
5. “Heating and DHW” (with central heating)
or
“Only DHW” (summer mode, no central heating)
Extended menu
1.
2. “DHW” (see display example)
3. “Set DHW temperature”
4. Set the required value.
If you want DHW heating, check the following points:
HHave you set the required DHW temperature?
For settings, see the next chapter.
HHave you selected the correct heating program?
HHave you set the required time program?
For settings, see page 21.