Viessmann FB2B, Vitodens 242-F Installation And Service Instructions Manual

Installation and service
instructions

for contractors

VIESMANN

Vitodens 242-F
Type FB2B, 4.8 to 26 kW

Gas condensing/solar storage combi boiler
Natural gas and LPG version
Gas Council no.:
47-819-18 (19 kW)
47-819-19 (26 kW)

For applicability, see the last page

VITODENS 242-F

5412 755 GB 5/2010

Please keep safe.

2

Please follow these safety instructions closely to prevent accidents and mate­rial losses.

Safety instructions explained

Danger

This symbol warns against the
risk of injury.

!

Please note

This symbol warns against the
risk of material losses and envi­ronmental pollution.

Note

Details identified by the word "Note" con­tain additional information.

Target group

These instructions are exclusively
designed for qualified personnel.

■ Work on gas equipment must only be
carried out by a qualified gas fitter.

■ Work on electrical equipment must
only be carried out by a qualified elec­trician.

■ The system must be commissioned by
the system installer or a qualified per­son authorised by the installer.

Regulations

Observe the following when working on
this system

■ all legal instructions regarding the pre­vention of accidents,

■ all legal instructions regarding envi­ronmental protection,

■ the Code of Practice of relevant trade
associations,

■ all current safety regulations as
defined by DIN, EN, DVGW, TRGI,
TRF, VDE and all locally applicable
standards,

■ Gas Safety (Installation & Use) Regu­lations
– the appropriate Building Regulation

either the Building regulations, the
Building Regulation (Scotland),
Building Regulations (Northern Ire­land),

– the Water Fittings Regulation or

Water Bylaws in Scotland,

– the current I.E.E. Wiring Regula-

tions.

If you smell gas

Danger

Escaping gas can lead to explo­sions which may result in serious
injury.

■ Never smoke. Prevent naked
flames and sparks. Never
switch lights or electrical appli­ances ON or OFF.

■ Close the gas shut-off valve.

■ Open windows and doors.

■ Remove all people from the
danger zone.

■ Notify your gas or electricity
supplier from outside the build­ing.

■ Shut off the electricity supply to
the building from a safe place
(outside the building).

Safety instructions

Safety instructions

5412 755 GB

3

If you smell flue gas

Danger

Flue gas can lead to life-threat­ening poisoning.

■ Shut down the heating system.

■ Ventilate the boiler room.

■ Close all doors leading to the
living space.

Working on the system

■ When using gas as fuel, also close the
main gas shut-off valve and safeguard
against unauthorised reopening.

■ Isolate the system from the power sup­ply and check that it is no longer 'live',
e.g. by removing a separate fuse or by
means of a main isolator.

■ Safeguard the system against unau­thorised reconnection.

!

Please note

Electronic modules can be dam­aged by electro-static dis­charges.
Touch earthed objects, such as
heating or water pipes, to dis­charge static loads.

Repair work

!

Please note

Repairing components which ful­fil a safety function can compro­mise the safe operation of your
heating system.
Replace faulty components only
with original Viessmann spare
parts.

Ancillary components, spare and
wearing parts

!

Please note

Spare and wearing parts which
have not been tested together
with the heating system can com­promise its function. Installing
non-authorised components and
non-approved modifications/con­version can compromise safety
and may invalidate our warranty.
For replacements, use only orig­inal spare parts from Viessmann
or those which are approved by
Viessmann.

Safety instructions

Safety instructions

(cont.)

5412 755 GB

4

Installation instructions

Preparing for installation

Product information.............................................................................................. 6

Preparing for installation....................................................................................... 6

Installation sequence

Installing the boiler............................................................................................... 11

Opening the control unit casing............................................................................ 15

Electrical connections........................................................................................... 16

Closing the control unit casing............................................................................. 22

Service instructions

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance.......................................... 24

Further details regarding the individual steps....................................................... 26

Code 1

Calling up coding level 1...................................................................................... 66

General................................................................................................................. 67

Select boiler ......................................................................................................... 69

DHW..................................................................................................................... 70

Solar..................................................................................................................... 70

Heating circuit 1, heating circuit 2, heating circuit 3............................................. 71

Code 2

Calling up coding level 2...................................................................................... 76

General................................................................................................................. 76

Select boiler.......................................................................................................... 84

DHW..................................................................................................................... 86

Solar..................................................................................................................... 88

Heating circuit 1, heating circuit 2, heating circuit 3............................................. 91

Diagnosis and service scans

Calling up the service menu................................................................................. 98

Diagnosis.............................................................................................................. 98

Checking outputs (actuator test).......................................................................... 101

Troubleshooting

Fault display......................................................................................................... 103

Fault codes........................................................................................................... 104

Repairs................................................................................................................. 114

Index

Index

5412 755 GB

5

Function description

Control unit........................................................................................................... 127

Internal extensions............................................................................................... 129

External extensions (accessories)........................................................................ 131

Control functions.................................................................................................. 135

Allocating heating circuits to the remote control................................................... 143

Electronic combustion controller.......................................................................... 143

Designs

Internal connection diagram................................................................................. 145

External connection diagram................................................................................ 146

Connection diagram, solar control module........................................................... 148

Parts lists............................................................................................................ 149

Commissioning/service reports........................................................................ 159

Specification....................................................................................................... 160

Certificates

Declaration of conformity...................................................................................... 161

Manufacturer's certificate according to the 1st BImSchV [Germany]................... 162

Keyword index.................................................................................................... 163

Index

Index

(cont.)

5412 755 GB

6

Vitodens 242-F, FB2B

Set up for operation with natural gas H.
For conversion to LPG P (without conversion kit), see page 32.
The Vitodens 242-F should generally only be delivered to those countries specified
on the type plate. For deliveries to alternative countries, an approved contractor, on
his own initiative, must arrange individual approval in accordance with the law of the
land.

Preparing for installation

Handling

If possible, leave the boiler on the pallet
during handling.
If space constraints make it necessary,
the boiler can be split for handling.

Installation instructions provided

!

Please note

To prevent equipment damage,
never set the boiler down on
its front or side panels or apply
loads to these areas.

Installation

Required room height at least 2100 mm.
The boiler weight is 161 kg (19 kW) to 165 kg (26 kW) (dry).

Preparing the boiler for installation

Use a connection set, available as an
accessory, to make the connection on
the gas and water sides. The following
overview shows sample connection sets
for installation on finished walls to the top
or side.

!

Please note

To prevent equipment damage,
install all pipework free of load
and torque stresses.

Preparing the connections on site:

Connection set installation
instructions.

Preparing for installation

Product information

5412 755 GB

7

65

1930

2008

100

719

46

40

50

1367

1422

1477

1532

1587

1642

1697

1752

1807

1875

1900

1135

1100

140

60

320

370

436

449

A

H

A

H

B

D
F

E
G

C

G
E

C

B

F
D

M

K

K

L

440

55

220

330

a

50

595

50

600

C

F

D

A
B

E

G
H

A

Solar return R ¾

B

Heating flow R ¾

C

DHW R ½

D

Gas connection R ½

E

DHW circulation R ½ (separate
accessory)

F

Cold water R ½

G

Heating return R ¾

H

Solar flow R ¾

K

Condensate drain to the back into
the wall

L

Side condensate drain

M

Cable entry area

N

DHW safety valve drain

Preparing for installation

Preparing for installation

(cont.)

5412 755 GB

Installation

8

Minimum clearances

Area around the Vitodens for maintenance: min. 700 mm.
Maintenance clearances to the l.h. or r.h. side of the Vitodens are not required.

Rated output range 4.8 to 19 kW 6.5 to 26 kW

a (mm) 200 224

Note

The adjustable feet give all height meas­urements a tolerance of +15 mm.

1. Prepare the heating water connec­tions.
Flush the heating system thor­oughly.

Note

Should an additional diaphragm
expansion vessel be required on site,
connect that vessel into the heating
return.

Preparing for installation

Preparing for installation

(cont.)

5412 755 GB

9

2. Prepare the connections on the DHW

side. Install the safety assembly
(accessory or on-site provision) in
accordance with
the Water Fittings Regulations 1999 in
the cold water line (see page 10).
Recommendation:
Install the safety valve above the
DHW cylinder to protect it against
contamination, scaling and high tem­peratures.
Connect the drain hose to the con­densate collector. Remove plug from
condensate collector.

3. Prepare the solar connections.

4.

Route condensate hose O to the
back (drain in wall K) or to the side
aperture L (see page 6).
Route condensate hose with a U­bend and connect to on-site drain line
or siphon. Discharge pipes from
expansion valves (safety valve)
should not be connected directly to a
drain and should pass through a visi­ble tundish, with a AUK3 air gap, and
be located adjacent to the device.

5. Prepare the gas connection accord­ing to TRGI or TRF or all local regu­lations.

6. Prepare the electrical connections.

■

Power cable: NYM-J 3 x 1.5 mm2,
fuse max. 16 A, 230 V/50 Hz.

■ Accessory cables: NYM with the

required number of conductors for
the external connections.

■

Allow all cables in area "M" (see
page 7) to protrude 2000 mm from
the wall.

Preparing for installation

Preparing for installation

(cont.)

5412 755 GB

Installation

10

Safety assembly to Water Fittings Regulations 1999

A

Safety assembly to
Water Fittings Regulations 1999 (acces­sory to connection sets for unfinished
walls)

B

Safety valve

C

Visible blow-off line outlet

D

Shut-off valve

E

Flow regulating valve (installation rec­ommended)

F

Pressure gauge connector

G

Non-return valve

H

Drain

K

Cold water

L

Drinking water filter

M

Pressure reducer to Water Fittings Reg­ulations 1999

N

Non-return valve/pipe separator

O

Cold water connection at connection set
(accessory)

Preparing for installation

Preparing for installation

(cont.)

5412 755 GB

11

Assembling the boiler

9.

8.

7.

6.

5.

1.

3.

2x

4.

2.

Installation sequence

Installing the boiler

5412 755 GB

Installation

12

Connections on the heating water and the DHW side

A
B

D
E

E
D

B
A

A B D E

C

C

C

Shown with connection sets for finished walls (accessories)

A

Heating flow R ¾

B

DHW R ½

C

DHW circulation R ½ (separate
accessory)

D

Cold water R ½

E

Heating return R ¾

Fitting the drain outlet and drain line
to the T&P valve

Separate installation instructions

DHW circulation connection

DHW circulation connection with
DHW circulation pump connection
set (accessory)

Separate installation instructions

Installation sequence

Installing the boiler

(cont.)

5412 755 GB

13

Connections on the solar side

B

A

A

B

A

B

Shown with connection sets for finished walls (accessories)

A

Solar return R ¾ or Ø22 mm smooth
tube

B

Solar flow R ¾ or Ø22 mm smooth
tube

Note

The solar circuit pump is integrated into
the boiler.

The expansion vessel, available as an
accessory, is installed in the solar
return.

Separate installation instructions

The solar safety valve can be fitted in the
boiler. Set the pressure gauge for the
solar circuit on site.

Note

Route the blow-off pipe for the safety
valve on the solar side into a suitable and
adequately sized drip container. A drip
container (2.5 litres) to be fitted in the
boiler is available as an accessory.

Installation sequence

Installing the boiler

(cont.)

5412 755 GB

Installation

14

Gas connection

Shown with connection sets for finished walls (accessories)

A

Gas connection R ½

Notes regarding operation with LPG.

We recommend the installation of an
external safety solenoid valve when
installing the boiler in rooms below
ground level.

1. Fix gas shut-off valve to gas connec­tion A.

2. Carry out a tightness test.

Note

For the tightness test, use only suita­ble and approved leak detecting
agents (EN 14291) and devices.
Leak detecting agents with unsuita­ble contents (e.g. nitrides, sulphides)
can lead to material damage.
Remove residues of the leak detect­ing agent after testing.

Installation sequence

Installing the boiler

(cont.)

5412 755 GB

15

!

Please note

Excessive test pressure may
damage the boiler and the gas
valve.
Max. test pressure 150 mbar.
Where higher pressure is
required for tightness tests,
separate the boiler and the
gas valves from the gas sup­ply pipe (undo the fitting).

3. Vent the gas line.

For conversion to a different gas type
see page 32

Flue gas connection

Connect the balanced flue. The flue ter­minals have to be installed as described
in accordance with the Building Regula­tions Part J and BS 5440.

Flue gas system installation
instructions.

Opening the control unit casing

1.

3.

2.

2x

Installation sequence

Installing the boiler

(cont.)

5412 755 GB

Installation

16

5.

4.

7x

Electrical connections

Information regarding the connection of accessories

For the connection, observe the separate installation instructions provided
with the accessory components.

!

Please note

Electronic modules can be damaged by electrostatic discharges.
Before beginning work, touch earthed objects, such as heating or water pipes,
to discharge static loads.

Installation sequence

Opening the control unit casing

(cont.)

5412 755 GB

17

X4

C

D

B

L

M

1~

L N

230V~

230V~

3217654

X3

40962035100

LN

L1N

2153

%

aVG

?

!

A

N L

?? ? ?

A

Solar control module KM BUS con­nection (connected in the delivered
condition)

B

Power supply, solar control module
(connected in the delivered condi­tion)

C

External safety solenoid valve
(LPG)

D

Cylinder primary pump

Plug 230 V~

sA Cylinder primary pump D (fitted

and connected)

fÖ

Power supply

■ Remove any existing individual
cores.

Danger

Incorrect core termination
can cause severe injuries
and damage to the equip­ment.

Installation sequence

Electrical connections

(cont.)

5412 755 GB

Installation

18

Never interchange cores

"L1" and "N".

■ Install an isolator in the power
supply line that simultaneously
isolates all non-earthed conduc­tors from the mains with at least
3 mm contact separation.
We additionally recommend
installing an AC/DC-sensitive
RCD (RCD class B ) for
DC (fault) currents that can occur
with energy efficient equipment.
Remove the existing cable grom­met when using larger cross-sec­tions (up to 714 mm). Secure the
cable with cable grommet F (see
page 21) integrated into the cas­ing base.

■ Max. fuse rating 16 A.

gD

External safety solenoid valve
(LPG)

C

Do not remove jumper between "1"
and "L" when making this connec­tion.

lH

Power supply of accessories
Where the boiler is installed in a wet
area, the connection of accessories
to the power supply must not be car­ried out at the control unit. If the
boiler is installed outside wet areas,
the power supply for accessories
can be connected directly to the
control unit (230 V/50 Hz). The con­nection is switched by the system
ON/OFF switch.

Note

If the total system current exceeds
6 A, connect one or more extensions
via a mains isolator directly to the
mains supply; see page 19.

Low voltage plug X3

!

Outside temperature sensor

Installation:

■ North or north-western wall, 2 to

2.5 m above ground level; in multi­storey buildings, in the upper half
of the second floor

■ Not above windows, doors or ven­tilation outlets

■ Not immediately below balconies
or gutters

■ Never render over

■ Cable length max. 35 m with a
cross-section of 1.5 mm

2

?

Flow temperature sensor for low
loss header (accessories)

%

Cylinder temperature sensor (fitted
and connected)

aVG

KM BUS subscriber (accessory)

■ Vitotrol 200A or 300A remote
control

■ Vitocom 100

■ Extension kit for one heating cir­cuit with mixer

■ Extension AM1 or EA1

■ Open Therm extension

Installation sequence

Electrical connections

(cont.)

5412 755 GB

19

Connection of accessories

145

145

40A

40

145

145

40A

40

B C

145

40

96

A

145

145

40A

40

D

E

A

Boiler control unit

B

Extension kit for a heating circuit
with mixer M2

C

Extension kit for heating circuit with
mixer M3

D

Extension AM1, EA1 and/or solar
control module SM1

E

ON/OFF switch

If a current flows to the actuators con­nected (e.g. circulation pumps) that is
higher than the safety level of the acces­sory, only use the output concerned to
control an on-site relay.

Accessories Internal fuse protection

Extension kit for one heating circuit with mixer 2 A
Extension AM1 4 A
Extension EA1 2 A
Solar control module SM1 2 A

Connecting the collector temperature sensor

Note

Solar control module A is attached to
the l.h. side of the air box.

Installation sequence

Electrical connections

(cont.)

5412 755 GB

Installation

20

B

% &aVG

A

Connect collector temperature sensor

&

to terminal box B of solar control
module A.
On-site extension cable: 2-core, cross­section 1.5 mm2.

Note

The cylinder temperature sensor for
solar heating % is delivered fitted and
connected.

Installation sequence

Electrical connections

(cont.)

5412 755 GB

21

Routing the connecting cables

!

Please note

Connecting cables will be damaged if they touch hot parts.
When routing and securing power cables on site, ensure that the maximum
permissible temperatures for these cables are not exceeded.

A

Low voltage connections

B

230 V connections

C

Internal extension

D

Main PCB

E

Communication module (accesso­ries)

F

Cable grommet for power cable

Remove the existing cable grommet
when using larger cross-sections (up to

7

14 mm). Secure the cable with cable
grommet F (black) integrated into the
casing base.

Installation sequence

Electrical connections

(cont.)

5412 755 GB

Installation

22

1.

4.

2.

5.

3.

2x

6.

Insert programming unit (packed sepa­rately) into the control unit support.

Note

The programming unit can also be used
in a wall mounting base (accessory) near
the boiler.

Installation sequence

Closing the control unit casing

5412 755 GB

23

Wall mounting base installation
instructions

Installation sequence

Closing the control unit casing

(cont.)

5412 755 GB

Installation

24

For further information regarding the individual steps, see the page indicated

Commissioning steps

Inspection steps

Maintenance steps Page

• •

1. Removing the front panels............................................ 26

•

2. Filling the heating system.............................................. 26

•

3. Checking the power supply connection

•

4. Changing the language (if required)............................. 27

•

5. Setting the time and date (if required).......................... 28

•

6. Venting the boiler........................................................... 28

•

7. Venting the heating system........................................... 28

•

8. Filling siphon with water................................................ 29

•

9. Filling the solar circuit................................................... 30

• • •

10. Checking all connections on the heating water side
and DHW side for leaks

•

11. Naming the heating circuits........................................... 31

• •

12. Checking the gas type.................................................... 31

•

13. Gas type conversion (only for operation with LPG).... 32

• • •

14. Function sequence and possible faults....................... 32

• • •

15. Checking the static and supply pressure..................... 34

•

16. Setting the maximum output......................................... 36

• •

17. Checking the balanced flue system tightness (annular

gap check)....................................................................... 37

•

18. Removing the burner...................................................... 38

•

19. Checking the burner gasket and burner gauze

assembly......................................................................... 39

•

20. Checking and adjusting the ignition and ionisation

electrodes........................................................................ 40

•

21. Cleaning the heat exchanger and fitting the burner.... 40

• •

22. Checking the condensate drain and cleaning the

siphon.............................................................................. 42

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance

5412 755 GB

25

Commissioning steps

Inspection steps

Maintenance steps Page

•

23. Checking the neutralising system (if installed)

•

24. Checking the anode connection................................... 43

•

25. Testing the anode earth current with an anode tester 43

•

26. Draining the boiler on the DHW side............................ 45

•

27. Cleaning the primary store............................................ 46

•

28. Checking and replacing the magnesium anode (if

required).......................................................................... 47

•

29. Returning the primary store into use............................ 48

• •

30. Checking the diaphragm expansion vessel and

system pressure............................................................. 49

• • •

31. Checking the function of safety valves

• • •

32. Checking electrical connections are firmly seated

• • •

33. Checking gas equipment for tightness at operating

pressure........................................................................... 49

• •

34. Checking the combustion quality................................. 50

• • •

35. Checking the external LPG safety valve (if installed)

•

36. Matching the control unit to the heating system......... 51

•

37. Adjusting the heating curves........................................ 58

•

38. Connecting the control unit to the LON....................... 61

•

39. Scanning and resetting the "Service" display............. 63

• • •

40. Fitting the front panels................................................... 64

•

41. Instructing the system user........................................... 65

Commissioning, inspection, maintenance

Steps - commissioning, inspection and…

(cont.)

5412 755 GB

Service

26

Removing the front panels

See page 11, steps 1 to 5.

Filling the heating system

!

Please note

Unsuitable fill water increases the level of deposits and corrosion and may
lead to boiler damage.

■ Thoroughly flush the entire heating system prior to filling it with water.

■ Only use fill water of potable quality.

■ Soften fill water with hardness exceeding 300 ppm (3.0 mmol/l), e.g. with a
small softening system for heating water (see Vitoset pricelist).

■ An antifreeze additive suitable for heating systems can be added to the fill
water.

Shown with connection set for finished walls (accessory)

1. Check the pre-charge pressure of the
diaphragm expansion vessel.

2. Close the gas shut-off valve.

3. Fill heating system via boiler drain &

fill valve A in the heating return
(depending on connection set either
on the side or above the boiler). (Min­imum system pressure > 1.0 bar).

Commissioning, inspection, maintenance

Further details regarding the individual steps

5412 755 GB

27

Note

If the control unit has not been
switched on prior to filling the system,
then the servomotor of the diverter
valve will still be in its central position,
and the system will be completely fil­led.

Note

Lever on valve B must be in the
"l.h." position.

4. If the control unit had already been
switched on before filling began:
Switch control unit ON and activate
filling program (see next steps).

Note

For function and details of the fill pro­gram, see page 137.

5.

Close boiler drain & fill valve A.

Activating the filling function:

1. Press OK and simultaneously for

approx. 4 s.

2. "Service functions"

3. "Filling"

4. Ending filling function:
Press OK or .

Changing the language (if required)

Note

At the commissioning stage, the display
is in German (default setting)

Extended menu:

1. å

2. "Settings"

3. "Language"

Sprache

Cesky

CZ

Deutsch

DE

Dansk
English

DK
GB

Wählen mit

Ø

ç

4. Set the required language with / .

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

28

Setting the time and date (if required)

During commissioning, or after pro­longed time out of use, the time and date
need to be reset.

Extended menu:

1. å

2. "Settings"

3. "Time / Date"

4. Set current time and date.

Venting the boiler

A

C

B

1. Close the shut-off valves on the heat­ing water side.

2.

Remove cover panel A.

3. Connect the drain hose on air vent
valve B with a drain.

4.

Open air vent valve B and fill valve
C

in the heating return and vent
using mains pressure (flush) until no
more air noise can be heard.

5.

Close air vent valve B and fill valve
C

in the heating return, and open the
shut-off valves on the heating water
side.

Venting the heating system

1. Close the gas shut-off valve and

switch the control unit ON.

2. Activate venting program (see next
steps).

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

29

Note

For function and sequence of the
venting program, see page 137.

3. Check the system pressure.

Activate venting program:

1. Press OK and å simultaneously

for approx. 4 s.

2. "Service functions"

3. "Venting"

4. Terminating venting program:
Press OK or ä.

Filling siphon with water

A

B

C

1. Pivot control unit forward.

2.

Pull retaining clip A off.

3.

Pull filler pipe B upwards.

4.

Pull off trap C downwards.

5. Fill siphon with water and reassem­ble.

6. Refit cover panel.

7. Secure control unit back in operating

position.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

30

Filling the solar circuit

Solar thermal system installation and service instructions

A

Solar circuit fill valve

!

Please note

Overheated collector areas and
overheated heat transfer medium
can cause burns/scalding and
equipment damage.
When working on the collector
and the solar circuit, protect the
collector area against solar irra­diation.

1. Thoroughly flush the on-site pipe­work.

2.

Fill the solar circuit via fill valve A
with "Tyfocor LS".
Minimum system pressure: 1.7 bar.
Permiss. operating pressure: 6 bar.

!

Please note

To prevent equipment dam­age, use only "Tyfocor LS".
Never fill with water.

3.

Close ball valve of fill valve A.

4. Open the air vent valve at the solar
collector.

5. Start solar circuit pump via a relay
test (see page 101).

6. Let the solar circuit pump run until the
solar circuit is fully vented. At a sys­tem pressure below 1.7 bar top up
with "Tyfocor LS".

7. Close the air vent valve at the solar
collector.

8. Check system pressure. Below

1.7 bar top up with "Tyfocor LS".

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

31

Naming the heating circuits

In the delivered condition, the heating
circuits are designated "Heating circuit

1", "Heating circuit 2" and "Heating
circuit 3" (if installed).

If the system user prefers, the heating
circuits can be designated differently to
suit the specific system.

Enter names for heating cir­cuits:

Operating instructions

Checking the gas type

The boiler is equipped with an electronic combustion controller that adjusts the burner
for optimum combustion in accordance with the prevailing gas quality.

■ Consequently, for natural gas there is no adjustment required across the entire
Wobbe index range.
The boiler can be operated in the Wobbe index range 9.5 to 15.2 kWh/m3 (34.2 to

54.7 MJ/m3).

■ Convert the burner for operation with LPG (see "Gas type conversion" on
page 32).

1. Determine the gas type and Wobbe

index by asking your local gas supply
utility or LPG supplier.

2. Convert the burner for operation with

LPG (see page 32).

3. Record the gas type in the service
report on page 159.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

32

Gas type conversion (only for operation with LPG)

1

2

A

1.

Set adjusting screw A on the gas
train to "2".

2.

Turn ON/OFF switch ON.

3. Select the gas type in coding address
"82":

■ Call up code 2

■ Call up "General"

■ In coding address "11", select

value "9"

■ In coding address "82", select

value "1" (LPG operation)

■

In code "11" select value ≠ "9".

■ End service functions.

4. Open the gas shut-off valve.

5. Affix label "G31" (supplied with the

technical documentation) adjacent to
the type plate on the cover panel.

Function sequence and possible faults

Display Measures

Control unit
issues a heat
demand

no

Increase set value
and ensure heat is
drawn off

yes

Fan starts

no

After approx. 51 s
fault F9

Check the fan, fan
connecting cables,
power at the fan
and fan control

Commissioning, inspection, maintenance

Further details regarding the individual steps

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5412 755 GB

33

yes

Ignition

no

Fault EE

Check the ignition
module (control
voltage 230 V
across plugs
"X2.1" and "X2.2")

yes

Gas train opens

no

Fault EE

Check the gas train
(control voltage
230 V); check the
gas supply pres­sure

yes

Ionisation current
builds
Symbol

A

no

Fault EE

Check the ionisa­tion electrode
adjustment and the
gas line for air­locks

yes

Burner in opera­tion

no

Stops below the
set boiler water
temperature and
restarts immedi­ately

Check the flue gas
system for tight­ness (flue gas
recirculation),
check the gas flow
pressure

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

34

yes

Automatic calibra­tion of the com­bustion controller

no

Fault E3

Ensure adequate
heat transfer.
Press reset button
R.

Fault Eb Check gap

between ionisation
electrode and
burner gauze
assembly.
Check allocation of
gas type (coding
address 82, gas
train setting).
Check flue system;
remedy flue gas
recirculation if
required.
Press reset button
R.

For further details regarding faults, see
page 103.

Checking the static and supply pressure

Danger

CO build-up as a result of an incorrect burner setup can have serious health
implications.
Carry out a CO test prior to and after work on gas equipment.

Operation with LPG

Flush the LPG tank twice during commissioning/replacement. Vent the tank and gas
supply lines thoroughly after flushing.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

35

A

1. Close the gas shut-off valve.

2. Release the screw inside test nipple

"PE" A on the gas train but do not
remove it, then connect the pressure
gauge.

3. Open the gas shut-off valve.

4. Check the static pressure and record

it in the service report on page 159.
Set value: max. 37 mbar

5. Start the boiler.

Note

During commissioning, the boiler can
enter a fault state because of airlocks
in the gas line. After approx. 5 s,
press the reset button R (see operat-
ing instructions) to reset the burner.

6. Check the supply (flow) pressure.

Set value:

■ Natural gas: 20 mbar

■ LPG: 37 mbar

Note

Use suitable test equipment with a
resolution of at least 0.1 mbar to
check the supply pressure.

7. Record the actual values in the serv­ice report on page 159.
Take the action shown in the follow­ing table.

8. Shut down the boiler, close the gas
shut-off valve, remove the pressure
gauge and close the screw in test nip­ple A.

9. Open the gas shut-off valve and start
the appliance.

Danger

Gas escaping from the test
nipple leads to a risk of explo­sion.
Check test nipple A for tight­ness.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

36

Supply (flow) pres­sure for natural
gas

Supply (flow)
pressure for LPG

Measures

below 15 mbar below 25 mbar Do not start the boiler. Notify your gas

supply utility or LPG supplier.
15 to 25 mbar 25 to 45 mbar Start the boiler.
above 25 mbar above 45 mbar Install a separate gas pressure governor

upstream of the system and regulate the

pre-charge pressure to 20 mbar for natu-

ral gas or 37 mbar for LPG. Notify your

gas supply utility or LPG supplier.

Setting the maximum output

You can limit the maximum output for heating operation. The limit is set via the
modulation range. The max. adjustable output is limited upwards by the boiler coding
card.

1. Press OK and å simultaneously

for approx. 4 s.

2. "Service functions"

3. "Max. output"

4. "Change?" Select "Yes".

A value flashes on the display (e.g.
"85"). In the delivered condition, this
value represents 100 % of rated out­put.

5. Set the required value.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

37

Checking the balanced flue system tightness (annular gap
check)

A

Combustion air aperture (ventilation
air)

For balanced flue systems tested
together with the wall mounted gas fired
boiler, the requirement for a tightness
test during commissioning by the flue
gas inspector is not applicable.

We recommend that your heating engi­neer carries out a simple leak/tightness
test during the commissioning of your
system. For this, it would be sufficient to
check the CO2 or O2 concentration in the

combustion air at the annular gap of the
balanced flue pipe.
The flue pipe is deemed to be gas-tight
if the CO2 concentration in the combus-

tion air is no higher than 0.2 % or the
O2 concentration is at least 20.6 %.

If actual CO2 values are higher or O2 val­ues are lower, then pressure test the flue

pipe with a static pressure of 200 Pa.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

38

Removing the burner

4x

1. Switch OFF the main power supply

and the ON/OFF switch at the con­trol unit.

2. Close the gas shut-off valve and safe­guard against reopening.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

39

3. Pull electrical cables from fan motor

A

, gas valve B, ionisation elec­trode C, ignition unit D and earth
tab E.

4.

Release gas supply pipe fitting F.

5.

Undo four screws G and remove the
burner.

!

Please note

Prevent damage to the wire
gauze.
Never rest the burner on the
gauze assembly!

Checking the burner gasket and burner gauze assembly

Check burner gasket A and burner gauze assembly E for damage; replace if
required.

CADE 3xFB

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

40

1.

Remove electrodes B.

2.

Undo three retaining clips C at ther­mal insulation ring D and remove
thermal insulation ring D.

3. Undo four Torx screws and remove
burner gauze assembly E with its
gasket F.

4. Insert and secure a new burner
gauze assembly E with a new gas­ket F.
Torque: 3.5 Nm.

5.

Refit thermal insulation ring D.

6.

Refit electrodes B.
Torque: 4.5 Nm.

Checking and adjusting the ignition and ionisation electrodes

6

+2

0

4

+0,5

0

10

±1

A

A B

A

Ignition electrodes

B

Ionisation electrode

1. Check the electrodes for wear and
contamination.

2. Clean the electrodes with a small
brush (not with a wire brush) or sand
paper.

3. Check the electrode gaps. If the gaps
are not as specified or the electrodes
are damaged, replace and align the
electrodes together with new gas­kets. Tighten the electrode fixing
screws with 4.5 Nm torque.

Cleaning the heat exchanger and fitting the burner

!

Please note

Scratches on parts that are in contact with flue gas can lead to corrosion.

Never use brushes to clean the heat exchanger.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

41

A

1. Use a vacuum cleaner to remove
deposits from heat exchanger

A

inside the combustion chamber.

2. If required, spray slightly acidic,
chloride-free cleaning agents based
on phosphoric acid onto heat
exchanger A and let the solution
soak in for approx. 20 min.

3.

Thoroughly flush heat exchanger A
with water.

4. Install the burner. Fit the screw with a
serrated washer as well as the
remaining screws, then apply torque
diagonally with 8.5 Nm.

5. Fit the gas supply pipe with a new
gasket.

6. Check the gas connections for tight­ness.

Danger

Escaping gas leads to a risk of
explosion.
Check all fittings for gas tight­ness.

7. Connect the electrical cables/leads to
each corresponding component.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

42

Checking the condensate drain and cleaning the siphon

A

B

C

1. Check that the condensate can drain
freely at the siphon.

2.

Pull retaining clip A off.

3.

Pull filler pipe B upwards.

4.

Pull off trap C downwards.

5. Pull the condensate hose from trap

C

.

6. Clean the siphon.

7. Fill siphon with water and reassem-

ble.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

43

Checking the anode connection

Check that the earth lead is connected to
the magnesium anode.

AB

1.

2.

A

Magnesium anode

B

Earth cable

Testing the anode earth current with an anode tester

Note

We recommend that the magnesium anode function is checked annually. This func­tion test can be carried out without interrupting operation, by measuring the earth
current with an anode tester.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

44

ACB

1.

Remove cover A.

2.

Pull earth lead B from tab C.

3. Connect the tester (up to 5 mA) in
series between tab C and earth
cable B.

■ The anode is OK if the indicated

current is > 0.3 mA.

■ Visually inspect the anode if the

current measures < 0.3 mA, or if
there is no current at all (see
page 47).

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

45

Draining the boiler on the DHW side

1. Connect hose to drain valve and

route into a suitable container or drain
outlet.

Note

Ensure adequate ventilation in the
DHW pipework.

2. Turn drain valve from lever position

A

to lever position B or C as

required.

■

Lever position B: Drain heating
system excluding cylinder via the
cold water connection.

■

Lever position C: Drain heating
system and cylinder via the DHW
connection. Cold water connection
remains filled.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

46

Cleaning the primary store

Note

EN 806 specifies a visual inspection and (if required) cleaning every two years after
commissioning and thereafter according to requirements.

A

B

E

C D

1. Drain the primary store.

2.

Remove flange lid A.

3.

Remove T&P valve B.

4.

Undo eight screws C and remove
flange lid D.

5.

Dispose of gasket E.

6. Disconnect the primary store from the
pipework to prevent contamination
from entering the pipe system.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

47

7. Remove loose deposits with a high

pressure cleaner.

!

Please note

When cleaning the inside,
only use plastic cleaning uten­sils.

8. Use a chemical cleaning agent to
remove hard deposits that cannot be
removed by a high pressure
cleaner.

!

Please note

Never use hydrochloric acid
based cleaning agents.

9. Thoroughly flush the primary store
after cleaning.

Checking and replacing the magnesium anode (if required)

Check the magnesium anode. If the anode is found to have degraded to 10 to
15 mm Ø, we recommend replacing the magnesium anode.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

48

Returning the primary store into use

F

E

A

C

D

B

1. Reconnect the primary store to the
pipework.

2.

Insert new gasket A underneath
flange lid B.

3.

Fit flange lid B and tighten eight
screws D with up to 25 Nm torque.

4.

Push earth cable C onto the tab.

5.

Fit T&P valve E.

6.

Fit cover F.

7. Fill the primary store with drinking
water.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

49

Checking the diaphragm expansion vessel and system pressure

A

Note

Carry out this test on a cold system.

1. Drain the system, until the pressure
gauge indicates "0".

2. If the diaphragm expansion vessel
inlet pressure is lower than the static
system pressure: Top up with nitro­gen via connection A, until the inlet
pressure is 0.1 to 0.2 bar.

3. Top up your heating system with
water and vent until the filling pres­sure of a cooled system is 0.1 to 0.2
bar higher than the inlet pressure of
the diaphragm expansion vessel.
Permiss. operating pressure: 3 bar

Checking gas equipment for tightness at operating pressure

Danger

Escaping gas leads to a risk of
explosion.
Check gas equipment for tight­ness.

Note

For the tightness test, use only suitable
and approved leak detecting agents (EN

14291) and devices. Leak detecting

agents with unsuitable contents (e.g.
nitrides, sulphides) can lead to material
damage.
Remove residues of the leak detecting
agent after testing.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

50

Checking the combustion quality

The electronic combustion controller automatically ensures an optimum combustion
quality. The combustion values only need to be checked during commissioning and
service. For this, check the CO2 or O2 content. For a description of the electronic

combustion controller functions, see page 143.

!

Please note

To prevent operating faults and equipment damage,
never operate with dirty combustion air.

CO2 or O2 content

■ The CO2 content must be within the following limits for the upper and lower output:
– 7.7 to 9.2 % for natural gas H

– 9.3 to 10.9 % for LPG P

■ For all gas types, the O2 content must be between 4.4 and 6.9 %.

If the actual CO2 or O2 values lie outside their respective ranges, proceed with the
following steps:

■ Checking the balanced flue system for tightness, see page 37.

■ Checking the ionisation electrode and connecting cable, see page 40.

Note

During commissioning, the combustion controller carries out an automatic calibration.
Only test the emissions approx. 30 s after the burner has started.

1. Connect a flue gas analyser at flue

gas aperture A on the boiler flue
connection.

2. Open the gas shut-off valve, start the
boiler and create a heat demand.

3. Select the lower output (see
page 51).

4. Check the CO2 content. Should the
actual value deviate from the above

ranges by more than 1 %, implement
steps from page 50.

5. Enter actual values into the service
report.

6. Select the upper output (see
page 51).

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

51

7. Check the CO2 content. Should the

actual value deviate from the above
ranges by more than 1 %, implement
steps from page 50.

8. After testing, press OK.

9. Enter actual values into the service

report.

To set the upper/lower output:

1. Press OK and simultaneously for

approx. 4 s.

2. "Actuator test"

3. Select the lower output:

Select "Base load" "ON" and con­firm with OK.

4. Select the upper output:
Select "Full load" "ON" and confirm
with OK.

Matching the control unit to the heating system

Subject to the equipment level, the control unit must be matched to the system. Var­ious system components are recognised automatically by the control unit and the
relevant codes are adjusted automatically.

■ For the selection of an appropriate scheme, see the following diagrams.

■ For coding steps, see page 66.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

52

System version 1

One heating circuit without mixer A1

3

1

2

wP

wQ

1

Vitodens 242-F

2

Outside temperature sensor

3

Heating circuit without mixer A1

wP

Solar collectors

wQ

Collector temperature sensor

Function/system components Code

Adjust Delivered con-

dition

Operation with LPG 82:1 82:0
System with DHW circulation pump:
DHW circulation pump connection at extension AM1,
terminal A2

— 34:0

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

53

System version 2

One heating circuit with mixer M2 and a low loss header

1

M

3

4
5

6

7

2

9

8

wP

wQ

1

Vitodens 242-F

2

Outside temperature sensor

3

Heating circuit with mixer M2

4

Temperature limiter for limiting the
maximum temperature of underfloor
heating systems

5

Flow temperature sensor M2

6

Heating circuit pump M2

7

Extension kit for one heating circuit
with mixer M2

8

Low loss header

9

Flow temperature sensor, low loss
header

wP

Solar collectors

wQ

Collector temperature sensor

Function/system components Code

Adjust Delivered con-

dition

Operation with LPG 82:1 82:0
System only with one heating circuit with mixer with
extension kit for mixer with DHW heating

00:4 00:6

System with DHW circulation pump:

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

54

Function/system components Code

Adjust Delivered con-

dition

DHW circulation pump connection at extension AM1,
terminal A2

— 34:0

System with low loss header 04:0 04:1

System version 3

One heating circuit without mixer A1 and one heating circuit with mixer M2

1

M

3 4

5
6

7

8

2

wP

wQ

1

Vitodens 242-F

2

Outside temperature sensor

3

Heating circuit without mixer A1

4

Heating circuit with mixer M2

5

Temperature limiter for limiting the
maximum temperature of underfloor
heating systems

6

Flow temperature sensor M2

7

Heating circuit pump M2

8

Extension kit for one heating circuit
with mixer M2

wP

Solar collectors

wQ

Collector temperature sensor

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

55

Note

The flow rate of the heating circuit with­out mixer must be at least 30 % greater
than the flow rate of the heating circuit
with mixer.

Function/system components Code

Adjust Delivered con-

dition

Operation with LPG 82:1 82:0
System only with one heating circuit with mixer with
extension kit for mixer with DHW heating

00:4 00:6

System with DHW circulation pump:
DHW circulation pump connection at extension AM1,
terminal A2

— 34:0

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

56

System version 4

One heating circuit without mixer A1, one heating circuit with mixer M2 and
system separation

1

2

3

4

5

7

6

9

M

8

wP

wQ

1

Vitodens 242-F

2

Outside temperature sensor

3

Heating circuit without mixer A1

4

Heating circuit with mixer M2

5

Temperature limiter for limiting the
maximum temperature of underfloor
heating systems

6

Flow temperature sensor M2

7

Heating circuit pump M2

8

Extension kit for one heating circuit
with mixer M2

9

Heat exchanger for system separa­tion

wP

Solar collectors

wQ

Collector temperature sensor

Function/system components Code

Adjust Delivered con-

dition

Operation with LPG 82:1 82:0
System only with one heating circuit with mixer with
extension kit for mixer with DHW heating

00:4 00:6

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

57

Function/system components Code

Adjust Delivered con-

dition

System with DHW circulation pump:
DHW circulation pump connection at extension AM1,
terminal A2

— 34:0

System version 5

One heating circuit without mixer A1, one heating circuit with mixer M2 (with
extension kit), one heating circuit with mixer M3 (with extension kit) and low
loss header (with/without DHW heating)

M M

1

qT

8

7

6

5

9

qP

qQ

qW

qE

qR

2

wP

wQ

4

3

1

Vitodens 242-F

2

Outside temperature sensor

3

Heating circuit without mixer A1
(heating circuit 1)

4

Heating circuit pump A1

5

Heating circuit with mixer M2 (heat­ing circuit 2)

6

Flow temperature sensor M2

7

Heating circuit pump M2

8

Extension kit for one heating circuit
with mixer M2

9

Heating circuit with mixer M3 (heat­ing circuit 3)

qP

Temperature limiter for limiting the
maximum temperature of underfloor
heating systems

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

58

qQ

Flow temperature sensor M3

qW

Heating circuit pump M3

qE

Extension kit for one heating circuit
with mixer M3

qR

Low loss header

qT

Flow temperature sensor, low loss
header

wP

Solar collectors

wQ

Collector temperature sensor

Function/system components Code

Adjust Delivered con-

dition

Operation with LPG 82:1 82:0
System only with two heating circuits with mixer with
extension kit for mixer with DHW heating

00:8 00:10

System without DHW circulation pump:
Heating circuit pump A1 connection at extension
AM1, terminal A1

— 33:1

System with DHW circulation pump:
Heating circuit pump A1 connection at extension
AM1, terminal A1

— 33:1

DHW circulation pump connection at extension AM1,
terminal A2

— 34:0

System with low loss header 04:0 04:1

Adjusting the heating curves

The heating curves illustrate the relation­ship between the outside temperature
and the boiler water or flow tempera­ture.
To put it simply, the lower the outside
temperature, the higher the boiler water
or flow temperature.
The room temperature, again, depends
on the boiler water or the flow tempera­ture.

Note

If the heating system includes heating
circuits with mixers, then the flow tem­perature of the heating circuit without
mixer is higher by a selected differential
(8 K in the delivered condition) than the
flow temperature of the heating circuits
with mixers.
The differential temperature can be
changed at coding address 9F.

Settings in the delivered condition:

■ Slope = 1.4

■ Level = 0

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

59

0.2

Outside temperature in °C

Boiler water or

flow temperature in °C

Slope

2.4

2.6

2.8

3.0

3.2

3.4

90

80

70

60

50

40

30

0 -5 -10 -15 -20510

A

B

2.0

2.2

Set room temperature in °C

35

30

25

20

15

10

5

0.4

0.6

0.8

1.0

1.2

1.4

-30-25

1.8

1.6

A

Heating curve slope for underfloor
heating systems

B

Heating curve slope for low temper­ature heating systems (according to
the Energy Savings Order [Ger­many])

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

60

Changing the slope and level

A

B

Boiler water or

flow temperature in °C

90

+20 -20

Outside temperature in °C

3.5

1.4

0.2

A

Changing the slope

B

Changing the level (vertical parallel
offset of the heating curve)

Extended menu:

1. å

2. "Heating"

3. Select heating circuit.

4. "Heating curve"

5. "Slope" or "Level"

6. Select heating curve according to the

system requirements.

Adjusting the set room temperature

Standard room temperature

90

-20

26 + 20

A

C

D

E

B

Example 1: Adjustment of the standard
room temperature from 20 to 26°C

A

Boiler water temperature or flow
temperature in °C

B

Outside temperature in °C

C

Set room temperature in °C

D

Heating circuit pump "OFF"

E

Heating circuit pump "ON"

Adjustment of the standard room
temperature:

Operating instructions

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

61

Reduced room temperature

+20 14 5

90

-20

D E

A

C

B

Example 2: Adjustment of reduced room
temperature from 5 °C to 14 °C

A

Boiler water temperature or flow
temperature in °C

B

Outside temperature in °C

C

Set room temperature in °C

D

Heating circuit pump "OFF"

E

Heating circuit pump "ON"

Adjustment of the reduced room tem­perature:

Operating instructions

Connecting the control unit to the LON

The LON communication module
(accessories) must be plugged in.

Installation instructions
LON communication module

Note

The data transfer via LON can take sev­eral minutes.

Single boiler system with
Vitotronic 200-H and Vitocom 300
(example)

Set the LON subscriber numbers and
further functions via code 2 (see the fol­lowing table).

Note

In the same LON system, the same num­ber cannot be allocated twice.
Only one Vitotronic may be program­med as fault manager.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

62

Boiler control unit Vitotronic 200-H Vitotronic 200-H Vitocom

LON LON LON

Subscriber no. 1
Code "77:1"

Subscriber no. 10
Code "77:10"

Subscriber no. 11
Set code "77:11"

Subscriber no.

99
Control unit is fault
manager
Code "79:1"

Control unit is not
fault manager
Code "79:0"

Control unit is not
fault manager
Code "79:0"

Device is fault

manager

Control unit transmits
the time
Code "7b:1"

The control unit
receives the time
Set code "81:3"

The control unit
receives the time
Set code "81:3"

Device

receives the

time
Control unit transmits
outside temperature
Set code "97:2"

The control unit
receives the outside
temperature
Set code "97:1"

The control unit
receives the outside
temperature
Set code "97:1"

—

LON subscriber fault
monitoring
Code "9C:20"

LON subscriber fault
monitoring
Code "9C:20"

LON subscriber fault
monitoring
Code "9C:20"

—

Carrying out a LON subscriber check

Communication with the system devices connected to the fault manager is tested
with a subscriber check.

Preconditions:

■ The control unit must be programmed

as fault manager (code "79:1")

■ The LON subscriber number must be

programmed in all control units (see
page 62)

■ The LON subscriber list in the fault

manager must be up to date (see
page 62)

Carrying out a subscriber check:

1. Press OK and å simultaneously

for approx. 4 s.

2. "Service functions"

3. "Subscriber check"

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

63

4. Select subscriber (e.g. subscriber

10).
The subscriber check for the selected
subscriber is introduced.

■ Successfully tested subscribers
are designated with "OK".

■ Unsuccessfully tested subscribers
are designated with "Not OK".

Note

To carry out a new subscriber check,
create a new subscriber list with
menu item "Delete list?"

Note

If the subscriber check is carried out
by another control unit, the sub­scriber number and "Wink" are
shown on the display for approx.
1 min.

Scanning and resetting the "Service" display

After the limit values specified in coding address "21" and "23" have been reached,
"Service" and " " appear on the programming unit display.

Acknowledging and resetting service

Press OK to acknowledge a service
message.

Note

An acknowledged service message that
was not reset reappears the following
Monday.

After a service has been carried out
(reset service)

1. Press OK and simultaneously for

approx. 4 s.

2. "Service functions"

3. "Service reset"

Note

The selected service parameters for
hours run and time interval restart
at 0.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

64

Fitting the front panels

4.

2.

2x

1.

5.

3.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

65

Instructing the system user

The system installer must hand the oper­ating instructions to the system user and
instruct him/her in the operation of the
system.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5412 755 GB

Service

66

Note

■ The codes are displayed as plain text.

■ Codes that have no function due to the
heating system equipment level or the
setting of other codes are not dis­played.

■ Heating systems with one heating cir­cuit without mixer and one or two heat­ing circuits with mixer:
The heating circuit without mixer is
designated "Heating circuit 1" and
the heating circuits with mixer as

"Heating circuit 2" or "Heating cir­cuit 3".

If the heating circuits were given indi­vidual designations, the selected des­ignation and "HC1", "HC2" or "HC3"
appear instead.

1. Press OK and å simultaneously

for approx. 4 s.

2. "Coding level 1"

3. Select group of required coding

address:

■ "General"

■ "Boiler"

■ "DHW"

■ "Solar"

■ "Heating circuit 1/2/3"

■ "All cod. or solar"
In this group, all coding addresses
from coding level 1 (except the cod-

ing addresses from the "Solar"
group) are displayed in ascending
order.

4. Select coding address.

5. Select value according to the follow-
ing tables and confirm with OK.

6. If you want to reset all codes to
their delivered condition:
Select "Standard setting" in "Cod­ing level 1".

Note

This also resets codes from coding
level 2.

Code 1

Calling up coding level 1

5412 755 GB

67

Coding

Coding in the delivered condition Possible change
System design

00:2 System version 1:

One heating circuit with­out mixer (A1), with DHW
heating

00:2
to
00:10

For system schemes, see
the following table:

Value
address
00: ...

System
version

Description

2 1 One heating circuit without mixer A1 (heating circuit 1), with

DHW heating (code is adjusted automatically)

4 2 One heating circuit with mixer M2 (heating circuit 2), with

DHW heating

6 3, 4 One heating circuit without mixer A1 (heating circuit 1) and

one heating circuit with mixer M2 (heating circuit 2), with DHW
heating (code is adjusted automatically)

8 5 One heating circuit with mixer M2 (heating circuit 2) and one

heating circuit with mixer M3 (heating circuit 3), with DHW
heating

10 5 One heating circuit without mixer A1 (heating circuit 1), one

heating circuit with mixer M2 (heating circuit 2) and one heat­ing circuit with mixer M3 (heating circuit 3), with DHW heating
(code is adjusted automatically)

Code 1

General

5412 755 GB

Service

68

Coding in the delivered condition Possible change
Internal circulation pump function

51:0 System with low loss

header:
Internal circulation pump
always starts when there
is a heat demand.

51:1 System with low loss

header:
When there is a heat
demand, the internal circu­lation pump will only be
started when the burner is
operational.

51:2 System with heating water

buffer cylinder:
When there is a heat
demand, the internal circu­lation pump will only be
started when the burner is
operational.

Subscriber no.

77:1 LON subscriber number 77:2

to
77:99

LON subscriber number,
adjustable from 1 to 99:
1 - 4 = Boiler
5 = Cascade
10 - 98 = Vitotronic 200-H
99 = Vitocom

Note
Allocate each number only
once.

Detached house/apartment building

7F:1 Detached house 7F:0 Apartment building

Separate adjustment of
holiday program and time
program for DHW heating,
as option

Lock out controls

8F:0 All control elements

active

8F:1 All control elements locked

out

8F:2 Only standard settings can

be controlled

Code 1

General

(cont.)

5412 755 GB

69

Coding in the delivered condition Possible change
Set flow temperature in case of ext. Demand

9b:70 Set flow temperature for

external demand 70 °C

9b:0
to
9b:127

Set flow temperature for
external demand adjusta­ble from 0 to 127 °C (limited
by boiler-specific parame­ters)

Select boiler

Coding

Coding in the delivered condition Possible change
Burner service in 100 hours

21:0 No service interval (hours

run) selected

21:1
to
21:100

The number of hours run
before the burner should
be serviced is adjustable
from 100 to 10,000 h
One adjusting step

≙

100 h

Service interval in months

23:0 No time interval for

burner service

23:1
to
23:24

Interval adjustable from 1
to 24 months

Service status

24:0 No "Service" display 24:1 "Service" display (the

address is automatically
set and must be manually
reset after a service has
been carried out)

Filling/Venting

2F:0 Venting program/fill pro-

gram disabled

2F:1 Venting program enabled
2F:2 Fill program enabled

Code 1

General

(cont.)

5412 755 GB

Service

70

Coding

Coding in the delivered condition Possible change
Set DHW temp reheat suppression

67:40 For solar DHW heating:

set DHW temperature
40 °C. Reheating of DHW
is suppressed above the
selected set tempera­ture.

67:0
to
67:95

Set DHW temperature
adjustable from 0 to 95 °C
(limited by boiler-specific
parameters)

Enable DHW circulation pump

73:0 DHW circulation pump:

"ON" according to time
program

73:1
to
73:6

"ON" from once per hour
for 5 min up to 6 times per
hour for 5 min during the
time program

73:7 Constantly "ON"

Solar

Coding

Coding in the delivered condition Possible change
Speed control collector pump

02:1 Solar circuit pump (multi-

stage) is speed-control­led with wave pack con­trol

02:0 Solar circuit pump (multi-

stage) is not speed-control­led

02:2 Do not adjust

Cylinder maximum temperature

08:60 The solar circuit pump will

stop when the actual cyl­inder temperature rea­ches 60 °C (maximum
cylinder temperature).

08:10
to
08:90

The maximum cylinder
temperature can be adjus­ted from 10 to 90 °C

Code 1

DHW

5412 755 GB

71

Coding in the delivered condition Possible change
Reducing stagnation time

0A:5 To protect the system

components and heat
transfer medium, the
speed of the solar circuit
pump is reduced when
the differential between
the actual cylinder tem­perature and set cylinder
temperature is less than
5 K.

0A:0
to
0A:40

The differential between
the set cylinder tempera­ture and the start point for
reducing the stagnation
time can be adjusted from
0 to 40 K.

Nominal flow rate

0F:70 The flow rate in the col-

lector circuit at the maxi­mum pump speed is set
to 7 l/min.

0F:1
to
0F:255

Flow rate in the collector
circuit adjustable from 0.1
to 25,5 l/min

Heating circuit 1, heating circuit 2, heating circuit 3

Coding

Coding in the delivered condition Possible change
Summer eco function outside temperature

A5:5 With heating circuit pump

logic function (economy
circuit): Heating circuit
pump "OFF" when the
outside temperature (AT)
is 1 K higher than the set
room temperature (RT

set

)

AT > RT

set

+ 1 K

A5:0 Without heating circuit

pump logic function
A5:1
to
A5:15

With heating circuit pump

logic function: Heating cir-

cuit pump "OFF"; see the

following table

Parameter address
A5:...

With heating circuit pump logic function: Heating cir­cuit pump "OFF"

1 AT > RT

set

+ 5 K

2 AT > RT

set

+ 4 K

3 AT > RT

set

+ 3 K

4 AT > RT

set

+ 2 K

Code 1

Solar

(cont.)

5412 755 GB

Service

72

Parameter address
A5:...

With heating circuit pump logic function: Heating cir­cuit pump "OFF"

5 AT > RT

set

+ 1 K

6 AT > RT

set

7
to

AT > RT

set

- 1 K

15 AT > RT

set

- 9 K

Coding in the delivered condition Possible change
Summer eco function absolute

A6:36 Extended economy mode

disabled

A6:5
to
A6:35

Extended economy control
enabled, i.e. the burner and
heating circuit pump will
stop and the mixer close at
a variable value, adjustable
between 5 and 35 °C plus
1 °C. The base value is the
adjusted outside tempera­ture. This value is based on
the actual outside temper­ature and a time constant
that takes the cooling down
of an average building into
consideration.

Mixer eco function

A7:0 Without mixer economy

function (only for heating
circuits with mixer)

A7:1 With mixer economy func-

tion (extended heating cir­cuit pump logic):
Heating circuit pump also
"OFF":

■ If a mixer has been
attempting to close for
longer than 20 min.

Heating circuit pump
"ON":

■ If the mixer changes to
control function

■ If there is a risk of frost

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

73

Coding in the delivered condition Possible change
Pump idle time transition red. mode

A9:7 With pump idle time:

Heating circuit pump
"OFF" in case of set value
modification by changing
the operating mode or
changing the set room
temperature

A9:0 Without pump idle time
A9:1
to
A9:15

With pump idle time;
adjustable from 1 to 15

Weather-compensated/room temperature hook-up

b0:0 With remote control:

Heating mode/reduced
mode: weather-compen­sated (change code only
for the heating circuit with
mixer)

b0:1 Heating mode: weather-

compensated
Reduced mode: with room
temperature hook-up

b0:2 Heating mode: with room

temperature hook-up
Reduced mode: weather­compensated

b0:3 Heating mode/reduced

mode: with room tempera­ture hook-up

Summer eco function room temperature

b5:0 With remote control: no

room temperature­dependent heating circuit
pump logic function
(change code only for
heating circuit with
mixer)

b5:1
to
b5:8

Heating circuit pump logic
function, see the following
table:

Parameter
address b5:...

With heating circuit pump logic function:
Heating circuit pump "OFF" Heating circuit pump "ON"

1 RT

actual

> RT

set

+ 5 K RT

actual

< RT

set

+ 4 K

2 RT

actual

> RT

set

+ 4 K RT

actual

< RT

set

+ 3 K

3 RT

actual

> RT

set

+ 3 K RT

actual

< RT

set

+ 2 K

4 RT

actual

> RT

set

+ 2 K RT

actual

< RT

set

+ 1 K

5 RT

actual

> RT

set

+ 1 K RT

actual

< RT

set

6 RT

actual

> RT

set

RT

actual

< RT

set

- 1 K

7 RT

actual

> RT

set

- 1 K RT

actual

< RT

set

- 2 K

8 RT

actual

> RT

set

- 2 K RT

actual

< RT

set

- 3 K

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

Service

74

Coding in the delivered condition Possible change
Flow temperature minimum limit

C5:20 Electronic minimum flow

temperature limit 20 °C

C5:1
to
C5:127

Minimum limit adjustable
from 1 to 127 °C (limited by
boiler-specific parameters)

Flow temperature maximum limit

C6:74 Electronic maximum flow

temperature limit set to
74 °C

C6:10
to
C6:127

Maximum limit adjustable
from 10 to 127 °C (limited
by boiler-specific parame­ters)

Heating program - changeover

d5:0 External heating program

changeover changes to
"Constant operation with
reduced room tempera­ture" or "Standby mode".

d5:1 The external heating pro-

gram changeover changes
to "Constant operation with
standard room tempera­ture" (independent of cod­ing address 3A, 3b and
3C)

Ext. heating program changeover to heating circuit

d8:0 No heating program

changeover via extension
EA1

d8:1 Heating program change-

over via input DE1 at exten­sion EA1

d8:2 Heating program change-

over via input DE2 at exten­sion EA1

d8:3 Heating program change-

over via input DE3 at exten­sion EA1

Screed function

F1:0 Screed function disa-

bled.

F1:1
to
F1:6

Screed drying function
adjustable in accordance
with 6 optional tempera­ture/time profiles (see
page 137)

F1:15 Constant flow temperature

20 °C

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

75

Coding in the delivered condition Possible change
Party mode time limit

F2:8 Time limit for party mode

or external heating pro­gram changeover via key:
8 h

*1

F2:0 No time limit for party

mode

*1

F2:1
to
F2:12

Time limit adjustable from 1
to 12 h

*1

Start temperature raising

F8:-5 Temperature limit for ter-

minating the reduced
mode -5 ºC, see example
on page 140.
Observe the setting of
coding address "A3"

F8:+10
to
F8:-60

Temperature limit adjusta­ble from
+10 to -60 °C

F8:-61 Function disabled

End temperature raising

F9:-14 Temperature limit for rais-

ing the reduced set room
temperature -14 ºC, see
example on page 140.

F9:+10
to
F9:-60

Temperature limit for rais­ing the set room tempera­ture to the value selected
for standard mode adjusta­ble from
+10 to -60 °C

Increase set flow temperature

FA:20 Raising the set boiler

water temperature or the
set flow temperature
when changing from
operation with reduced
room temperature to
operation with standard
room temperature by
20 %. See example on
page 141.

FA:0
to
FA:50

Temperature rise adjusta­ble from 0 to 50 %

Duration set flow temperature increase

Fb:30 Duration for raising the

set boiler water tempera­ture or the set flow tem­perature (see coding
address "FA") 60 min.
See example on
page 141.

Fb:0
to
Fb:150

Duration adjustable from 0
to 300 min;
1 step ≙ 2 min

*1

Party mode ends automatically in the "Heating and DHW" program, when the
system changes over to operation with standard room temperature.

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

Service

76

Note

■ In coding level 2, all codes are acces­sible, including the codes from coding
level 1.

■ Codes that have no function due to the
heating system equipment level or the
setting of other codes are not dis­played.

■ Heating systems with one heating cir­cuit without mixer and one or two heat­ing circuits with mixer:
The heating circuit without mixer is
designated "Heating circuit 1" and
the heating circuits with mixer as

"Heating circuit 2" or "Heating cir­cuit 3".

If the heating circuits were given indi­vidual designations, the selected des­ignation and "HC1", "HC2" or "HC3"
appear instead.

1. Press OK and å simultaneously

for approx. 4 s.

2. Press OK and ä simultaneously for

approx. 4 s.

3. "Coding level 2"

4. Select group of required coding

address:

■ "General"

■ "Boiler"

■ "DHW"

■ "Solar"

■ "Heating circuit 1/2/3"

■ "All cod. or solar"
In this group, all coding addresses
(except the coding addresses from
the "Solar" group) are displayed in
ascending order.

5. Select coding address.

6. Select value according to the follow-
ing tables and confirm with "OK".

7. If you want to reset all codes to
their delivered condition:
Select "Standard setting" in "Cod­ing level 2".

Note

This also resets codes from coding
level 1.

General

Coding

Coding in the delivered condition Possible change

00:2 System version 1:

One heating circuit with­out mixer (A1), with DHW
heating

00:2
to
00:10

For system schemes, see
the following table:

Code 2

Calling up coding level 2

5412 755 GB

77

Value
address
00: ...

System
version

Description

2 1 One heating circuit without mixer A1 (heating circuit 1), with

DHW heating (code is adjusted automatically)

4 2 One heating circuit with mixer M2 (heating circuit 2), with

DHW heating

6 3, 4 One heating circuit without mixer A1 (heating circuit 1) and

one heating circuit with mixer M2 (heating circuit 2), with DHW
heating (code is adjusted automatically)

8 5 One heating circuit with mixer M2 (heating circuit 2) and one

heating circuit with mixer M3 (heating circuit 3), with DHW
heating

10 5 One heating circuit without mixer A1 (heating circuit 1), one

heating circuit with mixer M2 (heating circuit 2) and one heat­ing circuit with mixer M3 (heating circuit 3), with DHW heating
(code is adjusted automatically)

Coding in the delivered condition Possible change

11:≠9

No access to the coding
addresses for the com­bustion controller param­eters

11:9 Access open to the coding

addresses for the combus­tion controller parameters

32:0 Without extension AM1 32:1 With extension AM1 (auto-

matic recognition)

33:1 Function output A1 at

extension AM1: Heating
circuit pump

33:0 Function output A1: DHW

circulation pump

33:2 Function output A1: Circu-

lation pump for cylinder
heating

34:0 Function output A2 at

extension AM1: DHW cir­culation pump

34:1 Function output A2: Heat-

ing circuit pump

34:2 Function output A2: Circu-

lation pump for cylinder
heating

35:0 Without extension EA1 35:1 With extension EA1 (auto-

matic recognition)

36:0

Function output aBJ at
extension EA1: Fault
message

36:1

Function output aBJ: Feed
pump

36:2

Function output aBJ: DHW
circulation pump

Code 2

General

(cont.)

5412 755 GB

Service

78

Coding in the delivered condition Possible change

3A:0 Function input DE1 at

extension EA1: without
function

3A:1 Function input DE1: Heat-

ing program changeover

3A:2 Function input DE1: Exter-

nal demand with set flow
temperature.
Function internal circula­tion pump: Coding address
3F

3A:3 Function input DE1: Exter-

nal blocking.
Function internal circula­tion pump: Coding address
3E

3A:4 Function input DE1: Exter-

nal blocking with fault mes­sage input
Function internal circula­tion pump: Coding address
3E

3A:5 Function input DE1: Fault

message input

3A:6 Function input DE1: Brief

operation, DHW circulation
pump (pushbutton func­tion).
DHW circulation pump run­time adjustment: Coding
address 3d

Code 2

General

(cont.)

5412 755 GB

79

Coding in the delivered condition Possible change

3b:0 Function input DE2 at

extension EA1: without
function

3b:1 Function input DE2: Heat-

ing program changeover

3b:2 Function input DE2: Exter-

nal demand with set flow
temperature.
Function internal circula­tion pump: Coding address
3F

3b:3 Function input DE2: Exter-

nal blocking.
Function internal circula­tion pump: Coding address
3E

3b:4 Function input DE2: Exter-

nal blocking with fault mes­sage input
Function internal circula­tion pump: Coding address
3E

3b:5 Function input DE2: Fault

message input

3b:6 Function input DE2: Brief

operation, DHW circulation
pump (pushbutton func­tion).
DHW circulation pump run­time adjustment: Coding
address 3d

Code 2

General

(cont.)

5412 755 GB

Service

80

Coding in the delivered condition Possible change

3C:0 Function input DE3 at

extension EA1: without
function

3C:1 Function input DE3: Heat-

ing program changeover

3C:2 Function input DE3: Exter-

nal demand with set flow
temperature.
Function internal circula­tion pump: Coding address
3F

3C:3 Function input DE3: Exter-

nal blocking.
Function internal circula­tion pump: Coding address
3E

3C:4 Function input DE3: Exter-

nal blocking with fault mes­sage input
Function internal circula­tion pump: Coding address
3E

3C:5 Function input DE3: Fault

message input

3C:6 Function input DE3: Brief

operation, DHW circulation
pump (pushbutton func­tion).
DHW circulation pump run­time adjustment: Coding
address 3d

3d:5 DHW circulation pump

runtime for brief opera­tion: 5 min

3d:1
to
3d:60

DHW circulation pump run­time adjustable from 1 to
60 min

3E:0 Internal circulation pump

stays in control mode at
signal "External block­ing"

3E:1 Internal circulation pump

stops at signal "External
blocking"

3E:2 Internal circulation pump

starts at signal "External
blocking"

Code 2

General

(cont.)

5412 755 GB

81

Coding in the delivered condition Possible change

3F:0 Internal circulation pump

stays in control mode at
signal "External
demand"

3F:1 Internal circulation pump

stops at signal "External
demand"

3F:2 Internal circulation pump

starts at signal "External
demand"

51:0 System with low loss

header:
Internal circulation pump
always starts when there
is a heat demand.

51:1 System with low loss

header:
When there is a heat
demand, the internal circu­lation pump will only be
started when the burner is
operational.

51:2 System with heating water

buffer cylinder:
When there is a heat
demand, the internal circu­lation pump will only be
started when the burner is
operational.

52:0 Without flow temperature

sensor for low loss
header

52:1 With flow temperature sen-

sor for low loss header

(automatic recognition)
54:3 Do not adjust
6E:50 Do not adjust
76:0 Without LON communi-

cation module (only for
weather-compensated
control units)

76:1 With LON communication

module (automatic recog-

nition)

77:1 LON subscriber number

(only for weather-com­pensated control units)

77:2
to
77:99

LON subscriber number,

adjustable from 1 to 99:

1 - 4 = Boiler

5 = Cascade

10 - 98 = Vitotronic 200-H

99 = Vitocom

Note

Allocate each number only

once.

Code 2

General

(cont.)

5412 755 GB

Service

82

Coding in the delivered condition Possible change

79:1 With LON communication

module: Control unit is
fault manager (only for
weather-compensated
control units)

79:0 Control unit is not fault

manager

7b:1 With LON communication

module: The control unit
transmits the time (only
for weather-compensa­ted control units)

7b:0 Does not transmit time

7F:1 Detached house (only for

weather-compensated
control units)

7F:0 Apartment building

Separate adjustment of
holiday program and time
program for DHW heating,
as option

80:6 A fault message is dis-

played, providing a fault
is active for at least 30 s

80:0 Immediate fault message
80:2
to
80:199

Minimum fault duration
until fault message occurs,
adjustable from 10 s to
995 s; 1 step ≙ 5 s

81:1 Automatic summer/win-

ter time changeover

81:0 Manual summer/winter

time changeover

81:2 Use of the radio clock

receiver (automatic recog­nition)

81:3 With LON communication

module: The control unit
receives the time

82:0 Operation with natural

gas

82:1 Operation with LPG (only

adjustable if coding
address 11:9 has been

set)
86:0 Do not adjust
87:0 Do not adjust
88:0 Temperature displayed in

°C (Celsius)

88:1 Temperature displayed in

°F (Fahrenheit)
8A:175 Do not adjust
8F:0 All control elements

active

8F:1 All control elements locked

out

8F:2 Only standard settings can

be controlled

Code 2

General

(cont.)

5412 755 GB

83

Coding in the delivered condition Possible change

90:128 Time constant for calcu-

lating the adjusted out­side temperature 21.3 h

90:1
to
90:199

Fast (low values) or slow
(high values) matching of
the flow temperature, sub­ject to the set value when
the outside temperature
changes;
1 step ≙ 10 min

94:0 Without Open Therm

extension

94:1 With Open Therm exten-

sion (automatic recogni­tion)

95:0 Without Vitocom 100

communication interface

95:1 With Vitocom 100 commu-

nication interface (auto­matic recognition)

97:0 With LON communication

module: The outside tem­perature of the sensor
connected to the control
unit is utilised internally
(only for weather-com­pensated control units)

97:1 The control unit receives

the outside temperature

97:2 The control unit transmits

the outside temperature to
the Vitotronic 200-H

98:1 Viessmann system num-

ber (in conjunction with
monitoring of several sys­tems via Vitocom 300)

98:1
to
98:5

System number adjustable
from 1 to 5

99:0 Never adjust
9A:0 Never adjust
9b:70 Set flow temperature for

external demand 70 °C

9b:0
to
9b:127

Set flow temperature for
external demand adjusta­ble from 0 to 127 °C (limited
by boiler-specific parame­ters)

Code 2

General

(cont.)

5412 755 GB

Service

84

Coding in the delivered condition Possible change

9C:20 Monitoring LON subscrib-

ers.
If a subscriber fails to
respond, the values
specified inside the con­trol unit will be used after
20 min. Only then will a
fault message be issued.
(only for weather-com­pensated control units)

9C:0 No monitoring
9C:5
to
9C:60

The time is adjustable from

5 to 60 min

9F:8 Differential temperature

8 K; only in conjunction
with the mixer circuit (only
for weather-compensa­ted control units)

9F:0
to
9F:40

Differential temperature

adjustable from 0 to 40 K

Select boiler

Coding

Coding in the delivered condition Possible change

04:1 Minimum burner pause

subject to the boiler load
(specified by boiler cod­ing card)

04:0 Minimum burner pause set

permanently (specified by

boiler coding card)

Adjust for systems with low

loss header.
06:... Maximum limit of the

boiler water temperature,
specified in °C by the
boiler coding card

06:20
to
06:127

Maximum limit of the boiler

water temperature within

the ranges specified by the

boiler
0d:0 Do not adjust
0E:0 Do not adjust
13:1 Do not adjust
14:1 Do not adjust
15:1 Do not adjust

Code 2

General

(cont.)

5412 755 GB

85

Coding in the delivered condition Possible change

21:0 No service interval (hours

run) selected

21:1
to
21:100

The number of hours run
before the burner should
be serviced is adjustable
from 100 to 10 000 h
One adjusting step

≙

100 h

23:0 No time interval for

burner service

23:1
to
23:24

Interval adjustable from 1
to 24 months

24:0 No "Service" display 24:1 "Service" display (the

address is automatically
set and must be manually
reset after a service has
been carried out)

28:0 No burner interval igni-

tion

28:1
to
28:24

Time interval adjustable
from 1 h to 24 h. The burner
is force-started once every
30 s (only when operating

with LPG).
2E:0 Never adjust
2F:0 Venting program/fill pro-

gram disabled

2F:1 Venting program enabled

2F:2 Fill program enabled
30:0 Never adjust
38:0 Status burner control unit:

Operational (no fault)

38:≠0

Status burner control unit:
Fault

Code 2

Select boiler

(cont.)

5412 755 GB

Service

86

Coding

Coding in the delivered condition Possible change

56:0 Set DHW temperature

adjustable from 10 to
60 °C

56:1 Set DHW temperature

adjustable from 10 to
above 60 °C

Note

Maximum value subject to
boiler coding card.
Observe the max. permis­sible DHW temperature.

58:0 Without auxiliary function

for DHW heating

58:10
to
58:60

Input of a second set DHW
temperature, adjustable
from 10 to 60 °C (observe
coding addresses "56" and
"63")

5E:0 Circulation pump for cyl-

inder heating stays in
control mode at signal
"External blocking"

5E:1 Circulation pump for cylin-

der heating stops at signal
"External blocking"

5E:2 Circulation pump for cylin-

der heating starts at signal
"External blocking"

5F:0 Circulation pump for cyl-

inder heating stays in
control mode at signal
"External demand"

5F:1 Circulation pump for cylin-

der heating stops at signal
"External demand"

5F:2 Circulation pump for cylin-

der heating starts at signal
"External demand"

65:... Information regarding the

type of diverter valve (not
adjustable):
1: Viessmann diverter
valve
2: Wilo diverter valve
3: Grundfos diverter valve

Code 2

DHW

5412 755 GB

87

Coding in the delivered condition Possible change

67:40 For solar DHW heating:

set DHW temperature
40 °C. DHW reheating is
suppressed above the
selected set temperature
(DHW heating blocked by
the boiler).

67:0

to

67:95

Set DHW temperature
adjustable from 0 to 95 °C
(limited by boiler-specific
parameters)

6C:100 Set speed; internal circu-

lation pump with DHW
heating 100 %

6C:0

to

6C:100

Set speed adjustable from
0 to 100 %

6F:... Maximum output for

DHW heating in %, speci­fied by the boiler coding
card

6F:0

to

6F:100

Max. output for DHW heat­ing adjustable from min.
output to 100 %

71:0 DHW circulation pump:

"ON" according to time
program

71:1 "OFF" during DHW heating

to the first set value

71:2 "ON" during DHW heating

to the first set value

72:0 DHW circulation pump:

"ON" according to time
program

72:1 "OFF" during DHW heating

to the second set value

72:2 "ON" during DHW heating

to the second set value

73:0 DHW circulation pump:

"ON" according to time
program

73:1

to

73:6

"ON" from once per hour
for 5 min up to 6 times per
hour for 5 min during the
time program

73:7 Constantly "ON"

Code 2

DHW

(cont.)

5412 755 GB

Service

88

Coding

Coding in the delivered condition Possible change

00:8 The solar circuit pump

starts when the collector
temperature exceeds the
actual cylinder tempera­ture by 8 K.

00:2
to
00:30

The differential between
the actual cylinder temper­ature and the start point for
the solar circuit pump can
be adjusted from 2 to
30 K.

01:4 The solar circuit pump

stops when the differen­tial between the collector
temperature and the
actual cylinder tempera­ture is less than 4 K.

01:1
to
01:29

The differential between
the actual cylinder temper­ature and the stop point for
the solar circuit pump can
be adjusted from 1 to
29 K.

02:1 Solar circuit pump (multi-

stage) is speed-control­led with wave pack con­trol

02:0 Solar circuit pump (multi-

stage) is not speed-control­led

02:2 Do not adjust

03:10 The temperature differen-

tial between the collector
temperature and actual
cylinder temperature is
regulated to 10 K.

03:5
to
03:20

The differential tempera­ture control between col­lector temperature and
actual cylinder tempera­ture can be adjusted from 5
to 20 K

04:4 Controller amplification of

the speed control 4 %/K.

04:1
to
04:10

Controller amplification
adjustable from 1 to
10 %/K

05:10 Minimum speed of the

solar circuit pump 10 % of
the maximum speed

05:2
to
05:100

Minimum speed of the
solar circuit pump is adjust­able from 2 to 100 %

06:75 Maximum speed of the

solar circuit pump 75 % of
the maximum possible
speed

06:2
to
06:100

Maximum speed of the
solar circuit pump is adjust­able from 2 to 100 %

Code 2

Solar

5412 755 GB

89

Coding in the delivered condition Possible change

07:0 Interval function of the

solar circuit pump
switched off

07:1 Interval function of the

solar circuit pump switched
on.
To capture the collector
temperature more accu­rately, the solar circuit
pump starts for short
cycles.

08:60 The solar circuit pump will

stop when the actual cyl­inder temperature rea­ches 60 °C (maximum
cylinder temperature).

08:10

to

08:90

The maximum cylinder
temperature can be adjus­ted from 10 to 90 °C

09:130 The solar circuit pump will

be switched off when the
collector temperature
reaches 130 °C.

09:20

to

09:200

The temperature can be
adjusted from 20 to
200 °C

0A:5 To protect the system

components and heat
transfer medium, the
speed of the solar circuit
pump is reduced when
the differential between
the actual cylinder tem­perature and set cylinder
temperature is less than
5 K.

0A:0

to

0A:40

The differential between
the set cylinder tempera­ture and the start point for
reducing the stagnation
time can be adjusted from
0 to 40 K.

0b:0 Collector frost protection

function switched off

0b:1 Collector frost protection

function switched on (not
required with Viessmann
heat transfer medium).

0C:1 Delta T monitoring

switched on.
No flow rate captured in
the collector circuit, or
flow rate too low.

0C:0 Delta T monitoring

switched off.

0d:1 Night circulation monitor-

ing switched on.
Unintentional flow rate is
captured in the collector
circuit (e.g. at night).

0d:0 Night circulation monitor-

ing switched OFF.

Code 2

Solar

(cont.)

5412 755 GB

Service

90

Coding in the delivered condition Possible change

0E:1 Calculation of solar yield

with Viessmann heat
transfer medium

0E:2 Calculation of solar yield

with heat transfer medium
water (do not adjust)

0E:0 Calculation of solar yield

switched off

0F:70 The flow rate in the col-

lector circuit at the maxi­mum pump speed is set
to 7 l/min.

0F:1
to
0F:255

Flow rate in the collector
circuit adjustable from 0.1
to 25,5 l/min

10:0 Target temperature con-

trol switched off (see cod­ing address 11)

10:1 Target temperature control

switched on

11:50 Set cylinder temperature

for solar 50 °C.

■ Target temperature
control switched on
(code 10:1):
Temperature at which
the solar heated water
in the DHW cylinder is
to be stratified.

11:10
to
11:90

The set cylinder tempera­ture for solar can be adjus­ted from 10 to 90 °C

12:20 Minimum collector tem-

perature 20 °C.
The solar circuit pump is
not started until the mini­mum collector tempera­ture set at the collector
temperature sensor is
exceeded.

12:0 Minimum collector temper-

ature function switched off
12:1
to
12:90

The minimum collector

temperature can be adjus-

ted from 1 to 90 °C

Code 2

Solar

(cont.)

5412 755 GB

91

Coding

Coding in the delivered condition Possible change

A0:0 Without remote control A0:1 With Vitotrol 200A (auto-

matic recognition)

A0:2 With Vitotrol 300A or

Vitohome 300 (automatic
recognition)

A1:0 All possible settings at

the remote control can be
accessed

A1:1 Only party mode can be set

at the remote control (only
for Vitotrol 200A)

A3:2 Outside temperature

below 1 °C: Heating cir­cuit pump "ON"
Outside temperature
above 3 °C: Heating cir­cuit pump "OFF"

A3:-9
to
A3:15

Heating circuit pump "ON/
OFF" (see the following
table)

!

Please note

If a value below 1 °C is selected, there is a risk that pipes outside the thermal
envelope of the house could freeze up.
The standby mode, in particular, should be taken into consideration, e.g. dur­ing holidays.

Parameter Heating circuit pump
Address A3:... "ON" "OFF"

-9 -10 °C -8 °C

-8 -9 °C -7 °C

-7 -8 °C -6 °C

-6 -7 °C -5 °C

-5 -6 °C -4 °C

-4 -5 °C -3 °C

-3 -4 °C -2 °C

-2 -3 °C -1 °C

-1 -2 °C 0 °C
0 -1 °C 1 °C
1 0 °C 2 °C
2
to

1 °C
to

3 °C
to

15 14 °C 16 °C

Code 2

Heating circuit 1, heating circuit 2, heating circuit 3

5412 755 GB

Service

92

Coding in the delivered condition Possible change

A4:0 With frost protection A4:1 No frost protection; this set-

ting is only possible if code

"A3:-9" has been selected.

Note

See "Please note" regard-

ing coding address "A3"

A5:5 With heating circuit pump

logic function (economy
circuit): Heating circuit
pump "OFF" when the
outside temperature (AT)
is 1 K higher than the set
room temperature (RT

set

)

AT > RT

set

+ 1 K

A5:0 Without heating circuit

pump logic function
A5:1
to
A5:15

With heating circuit pump

logic function: Heating cir-

cuit pump "OFF"; see the

following table

Parameter address
A5:...

With heating circuit pump logic function: Heating cir­cuit pump "OFF"

1 AT > RT

set

+ 5 K

2 AT > RT

set

+ 4 K

3 AT > RT

set

+ 3 K

4 AT > RT

set

+ 2 K

5 AT > RT

set

+ 1 K

6 AT > RT

set

7
to

AT > RT

set

- 1 K

15 AT > RT

set

- 9 K

Code 2

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

93

Coding in the delivered condition Possible change

A6:36 Extended economy mode

disabled

A6:5
to
A6:35

Extended economy control
enabled, i.e. the burner and
heating circuit pump will
stop and the mixer close at
a variable value, adjustable
between 5 and 35 °C plus
1 °C. The base value is the
adjusted outside tempera­ture. This value is based on
the actual outside temper­ature and a time constant
that takes the cooling down
of an average building into
consideration.

A7:0 Without mixer economy

function (only for heating
circuits with mixer)

A7:1 With mixer economy func-

tion (extended heating cir­cuit pump logic):
Heating circuit pump also
"OFF":

■ If a mixer has been
attempting to close for
longer than 20 min.

Heating circuit pump
"ON":

■ If the mixer changes to
control function

■ If there is a risk of frost

A8:1 Heating circuit with mixer

creates a demand for the
internal circulation pump

A8:0 Heating circuit with mixer

creates no demand for the
internal circulation pump

A9:7 With pump idle time:

Heating circuit pump
"OFF" in case of set value
modification by changing
the operating mode or
changing the set room
temperature

A9:0 Without pump idle time
A9:1
to
A9:15

With pump idle time;
adjustable from 1 to 15

Code 2

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

Service

94

Coding in the delivered condition Possible change

b0:0 With remote control:

Heating mode/reduced
mode: weather-compen­sated (change code only
for the heating circuit with
mixer)

b0:1 Heating mode: weather-

compensated
Reduced mode: with room
temperature hook-up

b0:2 Heating mode: with room

temperature hook-up
Reduced mode: weather­compensated

b0:3 Heating mode/reduced

mode: with room tempera­ture hook-up

b2:8 With remote control and

for the heating circuit,
operation with room tem­perature hook-up must be
programmed: Room influ­ence factor 8 (change
code only for heating cir­cuit with mixer)

b2:0 Without room influence
b2:1
to
b2:64

Room influence factor
adjustable from 1 to 64

b5:0 With remote control: no

room temperature­dependent heating circuit
pump logic function
(change code only for
heating circuit with
mixer)

b5:1
to
b5:8

Heating circuit pump logic
function, see the following
table:

Parameter
address b5:...

With heating circuit pump logic function:
Heating circuit pump "OFF" Heating circuit pump "ON"

1 RT

actual

> RT

set

+ 5 K RT

actual

< RT

set

+ 4 K

2 RT

actual

> RT

set

+ 4 K RT

actual

< RT

set

+ 3 K

3 RT

actual

> RT

set

+ 3 K RT

actual

< RT

set

+ 2 K

4 RT

actual

> RT

set

+ 2 K RT

actual

< RT

set

+ 1 K

5 RT

actual

> RT

set

+ 1 K RT

actual

< RT

set

6 RT

actual

> RT

set

RT

actual

< RT

set

- 1 K

7 RT

actual

> RT

set

- 1 K RT

actual

< RT

set

- 2 K

8 RT

actual

> RT

set

- 2 K RT

actual

< RT

set

- 3 K

Code 2

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

95

Coding in the delivered condition Possible change

C5:20 Electronic minimum flow

temperature limit 20 °C

C5:1
to
C5:127

Minimum limit adjustable
from 1 to 127 °C (limited by
boiler-specific parameters)

C6:74 Electronic maximum flow

temperature limit set to
74 °C

C6:10
to
C6:127

Maximum limit adjustable
from 10 to 127 °C (limited
by boiler-specific parame­ters)

d3:14 Heating curve slope =

1.4

d3:2
to
d3:35

Heating curve slope adjust­able from 0.2 to 3.5 (see
page 58)

d4:0 Heating curve level = 0 d4:–13

to
d4:40

Heating curve level adjust­able from –13 to 40 (see
page 58)

d5:0 External heating program

changeover changes to
"Constant operation with
reduced room tempera­ture" or "Standby mode"

d5:1 The external heating pro-

gram changeover changes
to "Constant operation with
standard room tempera­ture" (independent of cod­ing address 3A, 3b and
3C)

d6:0 Heating circuit pump

stays in control mode at
signal "External block­ing"

d6:1 Heating circuit pump stops

at signal "External block­ing" (subject to coding
addresses 3A, 3b and 3C)

d6:2 Heating circuit pump starts

at signal "External block­ing" (subject to coding
addresses 3A, 3b and 3C)

d7:0 Heating circuit pump

stays in control mode at
signal "External
demand"

d7:1 Heating circuit pump stops

at signal "External
demand" (subject to coding
addresses 3A, 3b and 3C)

d7:2 Heating circuit pump starts

at signal "External
demand" (subject to coding
addresses 3A, 3b and 3C)

Code 2

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

Service

96

Coding in the delivered condition Possible change

d8:0 No heating program

changeover via extension
EA1

d8:1 Heating program change-

over via input DE1 at exten­sion EA1

d8:2 Heating program change-

over via input DE2 at exten­sion EA1

d8:3 Heating program change-

over via input DE3 at exten-

sion EA1
E1:1 Do not adjust
E2:50 With remote control: No

display correction of the
actual room temperature

E2:0
to
E2:49

Display correction –5 K

to

Display correction –0.1 K

E2:51
to
E2:99

Display correction +0.1 K

to

Display correction +4.9 K
E5:0 Without external, variable

speed heating circuit
pump

F1:0 Screed function disabled F1:1

to
F1:6

Screed drying function

adjustable in accordance

with 6 optional tempera-

ture/time profiles (see

page 137)

F1:15 Constant flow temperature

20 °C
F2:8 Time limit for party mode

or external heating pro­gram changeover via key:
8 h

*1

F2:0 No time limit for party

mode

*1

F2:1
to
F2:12

Time limit adjustable from 1

to 12 h

*1

F8:-5 Temperature limit for ter-

minating the reduced
mode -5 ºC, see example
on page 140.
Observe the setting of
coding address "A3"

F8:+10
to
F8:-60

Temperature limit adjusta-

ble from

+10 to -60 °C

F8:-61 Function disabled

*1

Party mode ends automatically in the "Heating and DHW" program, when the
system changes over to operation with standard room temperature.

Code 2

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

97

Coding in the delivered condition Possible change

F9:-14 Temperature limit for rais-

ing the reduced set room
temperature -14 ºC, see
example on page 140.

F9:+10
to
F9:-60

Temperature limit for rais­ing the set room tempera­ture to the value selected
for standard mode adjusta­ble from
+10 to -60 °C

FA:20 Raising the set boiler

water temperature or the
set flow temperature
when changing from
operation with reduced
room temperature to
operation with standard
room temperature by
20 %. See example on
page 141

FA:0
to
FA:50

Temperature rise adjusta­ble from 0 to 50 %

Fb:30 Duration for raising the

set boiler water tempera­ture or the set flow tem­perature (see coding
address "FA") 60 min.
See example on
page 141.

Fb:0
to
Fb:150

Duration adjustable from 0
to 300 min;
1 step ≙ 2 min

Code 2

Heating circuit 1, heating circuit 2, heating…

(cont.)

5412 755 GB

Service

98

Press OK and å simultaneously for
approx. 4 s.

Service menu overview

Service

Diagnosis

Actuator test

Coding level 1

Brief scan

General
Heating circuit 1 HC1
Heating circuit 2 HC2

DHW
Solar

Service reset

Subscriber check
Service PIN

Heating circuit 3 HC3

Coding level 2

Fault history

Service functions

Terminate service?

Reset data

Filling
Venting
Max. output

Diagnosis

Scanning operating data

Operating data can be scanned in six areas. See "Diagnosis" in the service menu
overview.
Operating data on heating circuits with mixers and solar can only be scanned if the
components are installed in the system.
For further information on operating data, see chapter "Brief scan".

Note
"- - -" appears on the display if a sensor that has been scanned is faulty.

Calling up operating data

1. Press OK and å simultaneously

for approx. 4 s.

2. "Diagnosis"

3. Select required group, e.g. "Gen­eral".

Diagnosis and service scans

Calling up the service menu

5412 755 GB

99

Resetting operating data

Saved operating data (e.g. hours run) can be reset to 0.
The value "Adjusted outside temp" is reset to the actual value.

1. Press OK and å simultaneously

for approx. 4 s.

2. "Diagnosis"

3. "Reset data"

4. Select required value (e.g. "Burner
starts") or "All details".

Brief scan

In the brief scan, you can scan temperatures, software versions and connected com­ponents, for example.

1. Press OK and å simultaneously for approx. 4 s.

2. "Diagnosis"

3. "Brief scan".

4. Press OK.

The display shows 9 lines with 6 fields each.

Diagnose Kurzabfrage

2:

1:

3:
4:

Wählen mit

Ø

0

0

0

1 F

0
0
0 0

0

0

0 A

0
0
0 0

0

0

1 2

0
0
0

For an explanation of the relevant values in the individual lines and fields, see
the following table:
Line (brief
scan)

Field

1 2 3 4 5 6

1: Software version

Control unit

Equipment version Burner control unit ver-

sion

2: System scheme 01

to 10

Number
of KM
BUS sub­scribers

Maximum demand temperature

Diagnosis and service scans

Diagnosis

(cont.)

5412 755 GB

Service

100

Line (brief
scan)

Field

1 2 3 4 5 6

3: Software

version
Program­ming unit

Software
version
Mixer
exten­sion
0: No
mixer
exten­sion

Software
version
Solar con­trol mod­ule SM1

Software
version
LON
module

0

4: Software version

Burner control unit

Type
Burner control unit

Appliance type

5: 0 0 0 0 0
6: Number of LON sub-

scribers

Check
digit

Max. output
Details in %

Heating circuit A1

(without mixer)

Heating circuit M2
(with mixer)

Heating circuit M3
(with mixer)

7: Remote

control
0: w/o
1: Vitotrol
200A
2: Vitotrol
300A
or
Vitohome

Software
version
Remote
control
0: no
remote
control

Remote
control
0: w/o
1: Vitotrol
200A
2: Vitotrol
300A
or
Vitohome

Software
version
Remote
control
0: no
remote
control

Remote
control
0: w/o
1: Vitotrol
200A
2: Vitotrol
300A
or
Vitohome

Software
version
Remote
control
0: no
remote con­trol

Diagnosis and service scans

Diagnosis

(cont.)

5412 755 GB