Viessmann VITODENS 242-F, B2UA Installation And Service Instructions Manual

Installation and service
instructions

for contractors

VIESMANN

Vitodens 242-F
Type B2UA, 3.2 to 26 kW

Gas condensing/solar storage combi boiler
Gas council no.
41-819-18; 41-819-19
Natural gas and LPG version

For applicability, see the last page

VITODENS 242-F

5773 238 GB 4/2013

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 inten­ded for qualified contractors.

■ Work on gas installations must only be
carried out by a registered 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:

■ Statutory regulations regarding the
prevention of accidents

■ Statutory regulations regarding envi­ronmental protection

■ Codes of practice of the 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 Regula­tions.

If you smell gas

Danger

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

■ Do not smoke. Prevent naked
flames and sparks. Do not
switch lights or electrical appli­ances on or off.

■ Close the gas shut-off valve.

■ Open windows and doors.

■ Evacuate any people from the
danger zone.

■ Notify your gas or electricity
supply utility from outside the
building.

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

Safety instructions

Safety instructions

5773 238 GB

3

If you smell flue gas

Danger

Flue gas can lead to life-threat­ening poisoning.

■ Shut down the heating system.

■ Ventilate the installation site.

■ Close all doors in the living
space.

Flue systems and combustion air

Ensure that flue systems are clear and
cannot be sealed, for instance due to
accumulation of condensate or other
causes. Ensure a sufficient supply of
combustion air.
Instruct system users that subsequent
modifications to the building characteris­tics are not permissible (e.g. cable/pipe­work routing, cladding or partitions).

Danger

Life-threatening poisoning
caused by carbon monoxide in
the flue gas occurs as a result of
leaking or blocked flue systems
or an insufficient supply of com­bustion air.
Ensure the flue system is in
proper working order. It must not
be possible to close apertures for
interconnected combustion air
supply.

Extractors

Operating appliances that extract air to
the outside (cooker hoods, extractors, air
conditioning units, etc.) can create neg­ative pressure. If the boiler is operated at
the same time, this can lead to reverse
flow of the flue gas.

Danger

The simultaneous operation of
the boiler and appliances that
extract air to the outside can
result in life threatening poison­ing due to reverse flow of the flue
gas.
Fit an interlock circuit or take suit­able steps to ensure a sufficient
supply of combustion air.

Working on the system

■ Where gas is used as the fuel, close
the main gas shut-off valve and safe­guard it against unintentional reopen­ing.

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

■ Safeguard the system against recon­nection.

!

Please note

Electronic assemblies can be
damaged by electrostatic dis­charge.
Prior to commencing any work,
touch earthed objects, such as
heating or water pipes to dis­charge static loads.

Repair work

!

Please note

Repairing components that fulfil a
safety function can compromise
the safe operation of your sys­tem.
Defective components must be
replaced with genuine
Viessmann spare parts.

Safety instructions

Safety instructions

(cont.)

5773 238 GB

4

Auxiliary components, spare and
wearing parts

!

Please note

Spare and wearing parts that
have not been tested together
with the system can compromise
its function. Installing non-author­ised components and making
non-approved modifications or
conversions can compromise
safety and may invalidate our
warranty.
For replacements, use only orig­inal spare parts supplied or
approved by Viessmann.

Safety instructions

Safety instructions

(cont.)

5773 238 GB

5

Installation instructions

Preparing for installation

Product information.............................................................................................. 7

Preparing the installation...................................................................................... 7

Installation sequence

Installing the boiler............................................................................................... 21

Opening the control unit casing............................................................................ 29

Electrical connections........................................................................................... 30

Closing the control unit casing............................................................................. 39

Fitting the front panels.......................................................................................... 41

Service instructions

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance.......................................... 42

Further details regarding the individual steps....................................................... 45

Code 1

Calling up coding level 1...................................................................................... 85

"General".............................................................................................................. 85

"Boiler" ................................................................................................................. 88

"DHW".................................................................................................................. 89

"Solar".................................................................................................................. 89

"Heating circuit ..."................................................................................................ 90

Code 2

Calling up coding level 2...................................................................................... 97

"General".............................................................................................................. 97

"Boiler".................................................................................................................. 105

"DHW".................................................................................................................. 106

"Solar".................................................................................................................. 108

"Heating circuit ..."................................................................................................ 110

Diagnosis and service scans

Service menu....................................................................................................... 119

Diagnosis.............................................................................................................. 120

Checking outputs (actuator test).......................................................................... 123

Troubleshooting

Fault display......................................................................................................... 124

Fault codes........................................................................................................... 125

Repair................................................................................................................... 137

Index

Index

5773 238 GB

6

Function description

Control unit........................................................................................................... 151

Internal extensions (accessories)......................................................................... 153

External extensions (accessories)........................................................................ 156

Control functions.................................................................................................. 160

Allocating heating circuits to the remote control................................................... 168

Electronic combustion control unit........................................................................ 168

Designs

Internal connection diagram................................................................................. 170

External connection diagram................................................................................ 171

Connection diagram, solar control module........................................................... 173

Parts lists

Ordering individual parts...................................................................................... 174

Overview of the assemblies................................................................................. 175

Casing.................................................................................................................. 176

Hydraulics............................................................................................................. 178

Cylinder module................................................................................................... 181

Heat cell............................................................................................................... 186

Control unit........................................................................................................... 189

Miscellaneous....................................................................................................... 191

Commissioning/service reports........................................................................ 193

Specification....................................................................................................... 194

Certificates

Declaration of conformity...................................................................................... 195

Manufacturer's certificate according to the 1st BImSchV [Germany]................... 196

Keyword index.................................................................................................... 197

Index

Index

(cont.)

5773 238 GB

7

Vitodens 242-F, type B2UA

Preset for operation with natural gas E
and natural gas LL.
For conversion to LPG P (without con­version kit), see page 53.

In principle the Vitodens 242-F may only
be delivered to countries listed on the
type plate. For deliveries to alternative
countries, an approved contractor must
arrange individual approval on his own
initiative and in accordance with the law
of the country in question.

Intended use

The appliance is only intended to be
installed and operated in sealed unven­ted heating systems that comply with
EN 12828, with due attention paid to the
associated installation, service and
operating instructions. It is only designed
for the heating of water that is of potable
water quality.

Intended usage presupposes that a fixed
installation in conjunction with permissi­ble, system-specific components has
been carried out.

Commercial or industrial usage for a pur­pose other than heating the building or
DHW does not comply with regulations.

Any usage beyond this must be
approved by the manufacturer for the
individual case.

Incorrect usage or operation of the appli­ance (e.g. the appliance being opened
by the system user) is prohibited and
results in an exclusion of liability. Incor­rect usage also occurs if the components
in the heating system are modified from
their intended function (e.g. if the flue
gas and ventilation air paths are
sealed).

Preparing the 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.

!

Please note

Prevent damage to the appliance
during handling.
Never set the boiler down on its
front or sides, or apply any load
to these surfaces.

Preparing for installation

Product information

5773 238 GB

Installation

8

Dividing the boiler into sections

6.

7.

3.

5.

2.

1.

4.
2x

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

9

8.

9.

4x

8x

12.

10.

11.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

Installation

10

13.

14.

15.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

11

16.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

Installation

12

sF

%

%

17.

19.

21.

20.

18.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

13

24.

22.

23.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

Installation

14

27.

26.

25.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

15

28.

2x

2x

29.

30.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

Installation

16

Siting

Required room height: at least 2100 mm

Preparing for boiler installation

Use a connection set, available as an
accessory, to make the connection on
the gas and water sides.

Fitting accessories

Fit all accessories that are installed at
the back of the boiler (e.g. connection
sets).

!

Please note

Avoid device damage.
Connect all pipework free of load
and torque stress.

Preparing the connections on site:

Connection set installation
instructions.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

17

The following overview shows sample
connection sets for installation on fin­ished walls, with connection to the top or
side.

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

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

Installation

18

440

55

220

330

a

50

595

50

600

C

F

D

A
B

E

G
H

A

Solar return R¾

B

Heating flow R¾

C

DHW R½

D

Gas connection R½

E

DHW circulation R½ (separate
accessory)

F

Cold water R½

G

Heating return R¾

H

Solar flow R¾

K

Condensate drain facing backwards
into the wall

L

Condensate drain to the side

M

Wiring area

Rated heating output range 3.2 to 19 kW 6.5 to 26 kW

a (mm) 201 224

Note

All height dimensions have a tolerance
of +15 mm due to the adjustable feet.

1. Prepare the heating water connec­tions.
Thoroughly flush the heating sys­tem.

Note

Should an additional expansion ves­sel be required on site, connect this
vessel in the heating return.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

19

2. Prepare the connections on the DHW

side. Install the safety assembly
(accessory or on-site provision) in the
cold water line in accordance with
DIN 1988 and EN 806 (see
page 20).
Recommendation:
Install the safety valve above the
DHW cylinder to protect it against
contamination, scaling and high tem­peratures.

3. Prepare the solar connections.

>200

O

N

N

Drain for DHW safety valve and/or
siphon air vent valve

O

Condensate drain hose

4. Prepare the condensate connection
to the on-site drain line or siphon:

■ Drain towards the back:

See dimensions for condensate
hose O and position K in the dia­gram on page 17.

■ Drain towards the side aperture:

See position L in diagram on
page 17.

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

6. Prepare the electrical connections.

■

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

■ Accessory cables: NYM with the

required number of cores for the
external connections.

■

Allow all cables in area M in the
diagram on page 18 to protrude
2000 mm from the wall.

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

Installation

20

Safety assembly in accordance with DIN 1988 and EN 806 to the cold water
connection

A

Safety assembly (accessory for the
connection sets on unfinished
walls)

B

Safety valve

C

Visible discharge pipe outlet point

D

Shut-off valve

E

Flow regulating valve (installation
recommended)

F

Pressure gauge connection

G

Non-return valve

H

Drain

K

Cold water

L

Drinking water filter

M

Pressure reducer to DIN 1988-2,
Dec. 1988 issue

N

Non-return valve/pipe separator

O

Cold water connection at connec­tion set (accessories)

Preparing for installation

Preparing the installation

(cont.)

5773 238 GB

21

Removing the front panels

2.

4.

2x

1.

3.

5.

Installation sequence

Installing the boiler

5773 238 GB

Installation

22

Siting and levelling the boiler

1.

2.

SW17

Installation sequence

Installing the boiler

(cont.)

5773 238 GB

23

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 R¾

B

DHW R½

C

DHW circulation R½ (separate
accessory)

D

Cold water R½

E

Heating return R¾

Installation sequence

Installing the boiler

(cont.)

5773 238 GB

Installation

24

Connections on the solar side

B

A

A

B

A

B

Shown with connection sets for finished walls (accessories)

A

Solar return R¾ or Ø 22 mm,
smooth pipe

B

Solar flow R¾ or Ø 22 mm, smooth
pipe

Note

■ The following components are instal­led inside the appliance at the factory:

■ Circulation pump for the solar circuit.

■ Expansion vessel in the solar return.

■ Safety valve on the solar side.

Install the pressure gauge for the solar
circuit on site.

Installation sequence

Installing the boiler

(cont.)

5773 238 GB

25

Condensate connection

>200

O

N

1. If a DHW safety valve is connected,
connect hose N to the safety valve
drain.

Note

If no DHW safety valve is connected,
do not change the position of hose

N

(serves as a vent).

2.

Route condensate hose O to the
back (drain in wall K) or to side aper­ture L (see page 16).

Note

Pull the condensate hose far enough
out of the boiler that no unnecessary
bends are created inside the boiler.

3.

Route condensate hose M as a U­bend and connect with a constant fall
and a pipe vent to the public sewage
system or to a neutralising system.
If necessary, connect to an on-site
siphon. Ensure this connection is
secure. GB only:

■ The condensate pipe is connected
with the discharge pipe of the safety
valve. The condensate hose supplied
meets the temperature requirements
that are part of the CE certification.

■ We recommend connecting the con­densate pipe internally to the domestic
waste water system, either directly or
via a tundish.

■ If the condensate pipe is routed out­side the building, use a pipe with min.

7

30 mm and protect this pipe from

frost. Avoid long external pipelines.

!

Please note

Frozen condensate pipes can
result in faults and damage to
the boiler.
Always insulate condensate
pipes against frost.

■ Observe local building regulations.

Observe the local waste water regula­tions.

Note

Fill the siphon with water before com­missioning.

Installation sequence

Installing the boiler

(cont.)

5773 238 GB

Installation

26

Flue gas connection

Note

■ The labels "System certificate" and
"Skoberne GmbH flue system"
enclosed with the technical documen­tation may only be used in conjunction
with the Viessmann flue system made
by Skoberne.

■ During installation and positioning of
the flue system, observe Part L and
BS 5440 building regulations. (GB
only)

Connecting the balanced flue

Flue system installation instruc­tions

Do not carry out commissioning until
the following conditions are met:

■ Free passage through the flue gas
pipes.

■ Flue system with positive pressure is
gas-tight.

■ Apertures for ensuring sufficient com­bustion air supply are open and cannot
be closed off.

■ Applicable regulations on installing
and commissioning flue systems have
been followed.

Danger

Leaking or blocked flue systems
or an insufficient supply of com­bustion air cause life threatening
poisoning due to carbon monox­ide in the flue gas.
Ensure the flue system functions
correctly. Apertures for combus­tion air supply must not be able to
be closed off.

Installation sequence

Installing the boiler

(cont.)

5773 238 GB

27

Gas connection

Shown with connection sets for finished walls (accessories)

A

Gas connection R½

Information on operation with LPG

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

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

2. Carry out a tightness test.

Note

Only use suitable and approved leak
detection agents (EN 14291) and
devices for the tightness test. Leak
detection agents with unsuitable con­stituents (e.g. nitrites, sulphides) can
cause material damage.
Remove residues of the leak detec­tion agent after testing.

Installation sequence

Installing the boiler

(cont.)

5773 238 GB

Installation

28

!

Please note

Excessive test pressure may
damage the boiler and the gas
valve.
Max. test pressure 150 mbar
(15 kPa). Where higher pres­sure is required for tightness
tests, disconnect 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 53

Installation sequence

Installing the boiler

(cont.)

5773 238 GB

29

2x

4x

4.

3.

5.

2.

1.

Installation sequence

Opening the control unit casing

5773 238 GB

Installation

30

!

Please note

Electronic assemblies can be
damaged by electrostatic dis­charge.

Before beginning work, touch
earthed objects, such as heating
or water pipes, to discharge static
loads.

L N

230V~

230V~

96

40

1LN

2 1

145

2

1

32 15 4

145

40962035100

21

A

B

A

Radio clock receiver

B

Jumper

Connections to 230 V~ plug

fÖ

Power supply

lH

■ Power supply for accessories

■ External demand/blocking

Connections to LV plug

X3 Plug X3 can be removed to facili-

tate installation.

!

Outside temperature sensor

?

Flow temperature sensor for
low loss header (accessories)

A

Radio clock receiver

aVG

KM BUS subscriber (accessories)

Installation sequence

Electrical connections

5773 238 GB

31

To connect several accessories,
see page 35.

■ Vitotrol 200A or 300A remote
control

■ Vitocom 100, type GSM

■ Extension kit for one heating cir­cuit with mixer

■ Extension AM1

■ EA1 extension

■ Wireless base station

■ KM BUS distributor

Information on connecting
accessories

When connecting accessories
observe the separate installation
instructions provided with them.

Outside temperature sensor

!

For fitting the wireless outside tempera­ture sensor (wireless accessory):

Wireless base station installation
and service instructions

Fitting location for outside tempera­ture sensor

■ North or north-western wall, 2 to

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

■ Not above windows, doors or vents

■ Not immediately below balconies or
gutters

■ Never render over

Outside temperature sensor connec­tion

2-core lead, length max. 35 m with a
cross-section of 1.5 mm

2

Connecting the collector temperature sensor

Note

Solar control module C is secured to
the l.h. side of the air box.

Installation sequence

Electrical connections

(cont.)

5773 238 GB

Installation

32

B

% &aVG

C

A

D

Connect collector temperature sensor

A

to terminal box B with the prefitted
lead of SM1 solar control module C.
On-site extension cable D: 2-core,
cross-section of 1.5 mm2.

Note

Cylinder temperature sensor % is con­nected at the factory.

External demand via switching contact

Connection options:

■ Extension EA1 (accessory, see sepa­rate installation instructions).

■

Plug lH.

Burner operation is load-dependent if the
contact is closed. The boiler water is
heated to the value set in coding address
"9b" in group "General"/1. The boiler
water temperature is limited by this set
value and the electronic maximum limit
(coding address "06" in group "Boiler"/

2).

!

Please note

'Live' contacts lead to short cir­cuits or phase failure.
The external connection must be
potential-free and comply with
the requirements of safety cate­gory II.

Installation sequence

Electrical connections

(cont.)

5773 238 GB

33

Plug lH

Extension EA1

A

lH

N

?

1

L

A

Floating contact (when connecting,
remove jumper across L and 1)

B

[{S

DE

[{D

DE

[{A

DE

A

A

Floating contact

B

Extension EA1

Codes

■ "4b:1" in group "General"/1.

■ Effect of the function on the relevant
heating circuit pump:
Coding address "d7" in group "Heating
circuit" (only with weather-compensa­ted control units).

■ Effect of the function on the circulation
pump for cylinder heating (if installed):
Coding address "5F" in group "DHW"/

3.

Codes

■ Set "3A" (DE1), "3b" (DE2) or "3C"
(DE3) in group "General"/1 to 2.

■ Effect of the function on the relevant
heating circuit pump:
Coding address "d7" in group "Heating
circuit" (only with weather-compensa­ted control units).

■ Effect of the function on the circulation
pump for cylinder heating (if installed):
Coding address "5F" in group "DHW"/

3.

External demand via 0 – 10 V input

Connection at 0 – 10 V input to exten­sion EA1.

Ensure DC separation between the earth
conductor and the negative pole of the
on-site voltage source.

Installation sequence

Electrical connections

(cont.)

5773 238 GB

Installation

34

L

?

N

L

?

N

fÖ

S

P

aBJ

230 V~

Ö

[{{]

0-10V

f-]

A

U

0-10 V



+

+

-

0 – 1 V

≙ No default set boiler water
temperature

1 V

≙ Set value 10 °C

10 V

≙ Set value 100 °C

External blocking via switching contact

Connection options:

■

Plug lH.

■ Extension EA1 (accessory, see sepa­rate installation instructions).

The burner is switched off if this contact
is closed. The heating circuit pump and
(if installed) the circulation pump for cyl­inder heating are switched according to
the set code (see following table
"Codes").

!

Please note

'Live' contacts lead to short cir­cuits or phase failure.
The external connection must be
potential-free and comply with
the requirements of safety cate­gory II.

Installation sequence

Electrical connections

(cont.)

5773 238 GB

35

Plug lH

Extension EA1

A

lH

N

?

1

L

A

Floating contact (when connecting,
remove jumper across L and 1)

B

[{SDE[{D

DE

[{A

DE

A

A

Floating contact

B

Extension EA1

Codes

■ "4b:2" in group "General"/1

■ Effect of the function on the heating cir­cuit pump:
Coding address "d6" in group "Heating
circuit" (only with weather-compensa­ted control units).

■ Effect of the function on the circulation
pump for cylinder heating (if installed):
Coding address "5E" in group "DHW"/

3.

Codes

■ Set "3A" (DE1), "3b" (DE2) or "3C"
(DE3) in group "General"/1 to 3 or 4.

■ Effect of the function on the heating cir­cuit pump:
Coding address "d6" in group "Heating
circuit" (only with weather-compensa­ted control units).

■ Effect of the function on the circulation
pump for cylinder heating (if installed):
Coding address "5E" in group "DHW"/

3.

Power supply for accessories at plug lH (230 V~)

Where the boiler is installed in a wet
area, the power supply connection for
accessories must not be made at the
control unit. If the boiler is installed out­side wet areas, then the power supply
connection for accessories can be made
directly at the control unit. This connec­tion is switched directly with the ON/OFF
switch of the control unit.

If the total system current exceeds 6 A,
connect one or more extensions via an
ON/OFF switch directly to the mains sup­ply (see next chapter).

Installation sequence

Electrical connections

(cont.)

5773 238 GB

Installation

36

Power supply to all accessories via heat source control unit

145

145

40 A

40

145

145

40 A

40

B C

145

40

96

A

145

145

40 A

40

D

E

Some accessories with direct power supply

145

145

40 A

40

145

145

40 A

40

B C

145

40

96

A

145

145

40 A

40

D

E

A

Heat source control unit

B

Extension kit for heating circuit with
mixer M2

C

Extension kit for heating circuit with
mixer M3

D

Extensions AM1 or EA1

E

ON/OFF switch

The output concerned should only be
used to control an on-site relay if the cur­rent flowing to the connected working
parts (e.g. circulation pumps) is higher
than the safety level of the relevant
accessory.

Accessories Internal fuse

protection

Extension kit for heat­ing circuit with mixer

2 A

Extension AM1 4 A
Extension EA1 2 A

Installation sequence

Electrical connections

(cont.)

5773 238 GB

37

Power supply fÖ

Danger

Incorrect core allocation can
result in serious injury and dam­age to the appliance.
Take care not to interchange
wires "L1" and "N".

■

Remove existing wires from plug fÖ.

■ Install an isolator in the power cable
which simultaneously separates all
non-earthed conductors from the
mains with contact separation of at
least 3 mm.
In addition, we recommend the instal­lation of an AC/DC-sensitive RCD
(RCD class B ) for DC (fault)
currents that can be created by energy
efficient equipment.

■ Max. fuse rating 16 A.

Installation sequence

Electrical connections

(cont.)

5773 238 GB

Installation

38

Routing the connecting cables

!

Please note

Connecting cables will be dam­aged if they touch hot compo­nents.

When routing and securing
cables/leads on site, ensure that
the maximum permissible tem­peratures for these cables/leads
are not exceeded.

A

LV connections

B

230 V connections

C

Internal extension

D

Main PCB

E

Communication module (accesso­ries)

F

Cable grommet for power cable

Installation sequence

Electrical connections

(cont.)

5773 238 GB

39

5.

4.

2.

6.

2x

3.

1.

Installation sequence

Closing the control unit casing

5773 238 GB

Installation

40

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

Note

The programming unit can also be inser­ted into a wall mounting base (accesso­ries) near the boiler.

Wall mounting base installation
instructions

Installation sequence

Closing the control unit casing

(cont.)

5773 238 GB

41

2x

1.

4.

2.

3.

5.

Installation sequence

Fitting the front panels

5773 238 GB

Installation

42

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

Commissioning steps

Inspection steps

Maintenance steps Page

• •

1. Removing the front panels............................................ 45

•

2. Checking the power supply

•

3. Filling the heating system.............................................. 45

•

4. Filling the cylinder on the DHW side............................ 47

•

5. Switching on the power supply and ON/OFF switch

•

6. Changing the language.................................................. 47

•

7. Setting the time and date............................................... 47

•

8. Note on automatic testing of the flue gas temperature

sensor.............................................................................. 48

•

9. Venting the boiler........................................................... 48

•

10. Venting the heating system........................................... 49

•

11. Filling the siphon with water......................................... 50

•

12. Filling the solar circuit................................................... 51

• • •

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

•

14. Designating the heating circuits................................... 52

• •

15. Checking the gas type.................................................... 52

•

16. Gas type conversion (only for operation with LPG).... 53

• • •

17. Checking the static and supply pressure..................... 53

• • •

18. Function sequence and possible faults....................... 55

•

19. Setting the max. heating output.................................... 57

• •

20. Tightness test, balanced flue system (annular gap

check).............................................................................. 58

•

21. Burner removal............................................................... 59

• •

22. Checking the burner gasket and burner gauze

assembly......................................................................... 60

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance

5773 238 GB

43

Commissioning steps

Inspection steps

Maintenance steps Page

•

23. Checking and adjusting the ignition and ionisation

electrodes........................................................................ 61

•

24. Cleaning the heating surfaces....................................... 61

• •

25. Checking the condensate drain and cleaning the

siphon.............................................................................. 62

• •

26. Installing the burner....................................................... 63

•

27. Checking the neutralising system (if installed)

•

28. Checking the anode connection................................... 64

•

29. Testing the anode earth current with an anode tester 65

•

30. Draining the boiler on the DHW side............................ 66

•

31. Cleaning the primary store............................................ 67

•

32. Checking and replacing the magnesium anode (if

required).......................................................................... 68

•

33. Re-assembling and filling the primary store................ 68

• •

34. Checking the diaphragm expansion vessel and

system pressure............................................................. 69

•

35. Checking the pre-charge pressure and the DHW

expansion vessel (if installed)....................................... 70

• • •

36. Checking the function of safety valves

• • •

37. Checking firm seating of electrical connections

• • •

38. Checking all gas equipment for tightness at operating

pressure........................................................................... 70

• •

39. Checking the combustion quality................................. 71

• • •

40. Checking the flue system for unrestricted flow and
tightness

• • •

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

•

42. Matching the control unit to the heating system......... 72

•

43. Adjusting the heating curves........................................ 78

•

44. Connecting the control unit to the LON....................... 81

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance

5773 238 GB

Service

44

Commissioning steps

Inspection steps

Maintenance steps Page

•

45. Scanning and resetting the "Service" display............. 83

• • •

46. Fitting the cover panel and front panels...................... 83

•

47. Instructing the system user........................................... 84

Commissioning, inspection, maintenance

Steps - commissioning, inspection and…

(cont.)

5773 238 GB

45

Removing the front panels

See page 21.

Filling the heating system

Fill water

!

Please note

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

■ Flush the heating system thor­oughly before filling.

■ Only use fill water of potable
quality.

■ An antifreeze additive suitable
for heating systems can be
added to the fill water. The anti­freeze manufacturer must ver­ify its suitability.

■ Fill and top-up water with a
water hardness in excess of
the following values must be
softened, e.g. with a small soft­ening system for heating water.

Total permissible hardness of the fill and top-up water
Total heating
output

Specific system volume (Conversion rate 1 mol/m3 = 100
ppm)

kW < 20 l/kW ≥ 20 l/kW to

< 50 l/kW

≥ 50 l/kW

≤ 50

≤ 3.0 mol/m

3

≤ 2.0 mol/m

3

< 0.02 mol/m

3

> 50 to ≤ 200

≤ 2.0 mol/m

3

≤ 1.5 mol/m

3

< 0.02 mol/m

3

> 200 to ≤ 600

≤ 1.5 mol/m

3

≤ 0.02 mol/m

3

< 0.02 mol/m

3

> 600

< 0.02 mol/m

3

< 0.02 mol/m

3

< 0.02 mol/m

3

Conversion rate 1 mol/m3 = 100ppm

Commissioning, inspection, maintenance

Further details regarding the individual steps

5773 238 GB

Service

46

A

B

Shown with connection set for finished walls (accessories)

1. Check the pre-charge pressure of the
diaphragm expansion vessel. See
page 69.

2. Close the gas shut-off valve.

3.

Open shut-off valves B on the heat­ing water side.

4. Fill the heating system via boiler drain
& fill valve A in the heating return
(depending on the connection set
either on the side or above the boiler).

■ Minimum system pressure

> 1.0 bar (0.1 MPa).

■ Permissible operating pressure

3.0 bar (0.3 MPa).

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.

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

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.

6.

Close boiler drain & fill valve A.

Activating the filling function

Service menu

1. Press OK and å simultaneously for

approx. 4 s.

2. "Service functions"

3. "Filling"

Filling function is enabled.

4. Ending filling function:

Press OK or ä.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

47

Filling the cylinder on the DHW side

1.

Lever on valve B must be in the
"left" position.

2. Open on-site DHW supply and a
DHW draw-off point.

3. Once air stops coming out of the
DHW draw-off point, the DHW cylin­der is completely filled.

Changing the language

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

Extended menu:

1. å

2. "Einstellungen"

3. "Sprache"

4. Select the required language with
/ .

Sprache

Dansk

Cesky

Bulgarski

Deutsch

Wählen mit

ê

ê

ç

DE

BG
CZ
DK

ê

ê

(

Setting the time and date

The time and date need to be reset dur­ing commissioning or after a prolonged
time out of use.

Extended menu:

1. å

2. "Settings"

3. "Time / Date"

4. Set current time and date.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

48

Note on automatic testing of the flue gas temperature sensor

As soon as the time and date have been
set, the control unit automatically checks
the function of the flue gas temperature
sensor.
The display shows: "Flue gas temp
sensor test" and "Active".

Note

If the flue gas temperature sensor is
incorrectly positioned, commissioning
will be cancelled and fault message A3
will be shown (see page 145).

Venting the boiler

A

C

B

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

2.

Remove cover panel A.

3. Push the drain hose onto air vent
valve B and connect to 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.

First close air vent valve B.

6. When the required operating pres­sure has built up, close fill valve C.
Open the shut-off valves on the heat­ing water side.

7. Remove drain hose from air vent
valve B and retain.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

49

Venting the heating system

A

1. Close the gas shut-off valve and
switch the control unit ON.

2. Check whether the air vent screw in
quick-action air vent valve A of the
heating circuit pump is open.

3. Activate venting program (see next
chapter).

Note

For function and sequence of the
venting program, see page 162.

4. Check the system pressure.

5. Open the gas shut-off valve.

Activating the venting function

Service menu

1. Press OK and å simultaneously for

approx. 4 s.

2. "Service functions"

3. "Venting"
Venting function is enabled.

4. Ending venting function:
Press OK or ä.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

50

Filling the siphon with water

A

B

C

1. Pivot control unit forward.

2.

Remove retaining clip A.

3.

Pull filler pipe B upwards.

4.

Remove trap C downwards.

5. Fill siphon with water and refit.

6. Check that the condensate pipe is

connected correctly to the siphon and
heat exchanger.

Note

Route the drain hose without any
bends and with a constant fall.

7. Refit cover panel.

8. Secure control unit back into the

operating position.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

51

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 solar circuit with "Tyfocor LS" via
fill valve A.

■ Minimum system pressure: 1.7 bar

(0.17 MPa)

■ Permissible operating pressure:

6 bar (0.6 MPa)

!

Please note

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

3.

Close ball valve in fill valve A.

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

5. Start the solar circuit pump via the
actuator test (see page 123).

6. Let the solar circuit pump run until the
solar circuit is fully vented. If the sys­tem pressure is below 1.7 bar
(0.17 MPa), add more "Tyfocor LS".

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

8. Check system pressure. If the system
pressure is below 1.7 bar
(0.17 MPa), add more "Tyfocor LS".

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

52

Designating 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.

■ For operation with natural gas no
adjustment is therefore 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).

■ For operation with LPG the burner
must be converted (see "Gas type
conversion" on page 53).

1. Determine the gas type and Wobbe
index by asking your local gas supply
utility or LPG supplier.

2. For operation with LPG, convert the
burner (see page 53).

3. Record the gas type in the report on
page 193.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

53

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 ON/OFF switch .

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

■ Call up code 2

■ "General"

■ Select coding address "11" and

value "9". Confirm with OK. The
display shows "11:0".

■ Select coding address "82" and

value "1" (LPG operation). Confirm
with OK.

■ Select coding address "11" and

value ≠ "9". Confirm with OK. The
display shows "11:0".

■ 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.

Checking the static and supply pressure

Danger

CO build-up as a result of incor­rect burner adjustment can have
serious health implications.
Carry out a CO test before and
after work on gas appliances.

Operation with LPG

Flush the LPG tank twice during com­missioning or replacement. Vent the tank
and gas connection line thoroughly after
flushing.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

54

A

1. Close the gas shut-off valve.

2. Loosen the screw inside test connec-

tor "PE" A at 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

the actual value in the report on
page 193.
Set value: max. 57.5 mbar
(5.75 kPa).

5. Start the boiler.

Note

During commissioning, the boiler can
enter a fault state (fault EE is dis­played) because of air in the gas line.
After approx. 5 s, press reset button
R (see operating instructions) to reset
the burner.

6. Check the supply (flow) pressure.

Set value:

■ Natural gas: 20 mbar (2.0 kPa)

■ LPG: 50 mbar (5.0 kPa)

Note

Use a suitable measuring device with
a resolution of at least 0.1 mbar
(0.01 kPa) to check the supply pres­sure.

7. Record the actual value in the report
on page 193.
Take action as shown in the following
table.

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

55

Supply pressure (flow pressure) Action
For natural gas For LPG

Below 17.4 mbar
(1.74 kPa)

Below 42.5 mbar
(4.25 kPa)

Do not start the boiler. Notify your gas
supply utility or LPG supplier.

17.4 to 25 mbar
(1.74 to 2.5 kPa)

42.5 to 57.5 mbar
(4.25 to 5.75 kPa)

Start the boiler.

Above 25 mbar
(2.5 kPa)

Above 57.5 mbar
(5.75 kPa)

Install a separate gas pressure governor
upstream of the system and regulate the
pre-charge pressure to 20 mbar
(2.0 kPa) for natural gas or 50 mbar
(5.0 kPa) for LPG. Notify your gas supply
utility or LPG supplier.

Function sequence and possible faults

Display Action

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

Yes

Ignition

No

Fault EE

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

56

Yes

Gas train opens

No

Fault EE

Check the gas train
(control voltage
230 V) and 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 sys­tem for tightness
(flue gas recircula­tion); check the gas
flow pressure

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

57

Yes

Automatic calibra­tion of the com­bustion controller

No

Fault E3

Ensure adequate
heat transfer.
Press reset button
R.

Fault Eb Check gap be-

tween 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 124.

Setting the max. heating output

The maximum output for heating oper­ation can be limited. The limit is set via

the modulation range. The max. adjust­able output is limited upwards by the
boiler coding card.

Service menu

1. Press OK and å simultaneously for

approx. 4 s.

2. "Service functions"

3. "Max. output"

4. "Change?" Select "Yes".
A value is shown on the display (e.g.
"85"). In the delivered condition, this
value represents 100 % of rated heat­ing output.

5. Set the required value.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

58

Tightness test, balanced flue system (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.)

5773 238 GB

59

Burner removal

G

B

D

C

E

4x

FF

A

1. Switch OFF the power supply and the
ON/OFF switch at the control unit.

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

3.

Remove cables from fan motor A,
gas train B, ignition and ionisation
electrode C, ignition unit D and
earth tab E.

4.

Undo gas supply pipe fitting F.

5.

Undo four screws G and remove the
burner.

!

Please note

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

60

Checking the burner gasket and burner gauze assembly

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

A

C

2x

2x

B

D

E

F

1.

Remove electrodes B.

2.

Undo two retaining clips C on ther­mal insulation ring D and then
remove thermal insulation ring D.

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

4. Insert new burner gauze assembly

E

with new gasket F and secure.

Torque: 5.0 Nm.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

61

5.

Fit thermal insulation ring D.

6.

Fit 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 sand­paper.

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

Cleaning the heating surfaces

!

Please note

There should be no scratches or
other damage on the heat
exchanger surface that comes
into contact with hot gases. This
could lead to corrosion damage.

Never use brushes to clean the
heating surfaces.

Brushing can cause existing
deposits to get stuck in the coil
gaps.

Note

Discolouration of the heat exchanger
surface is a normal sign of usage. It has
no impact on the function and service life
of the heat exchanger.
The use of chemical cleaning agents is
not necessary.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

62

A

1. Use a vacuum cleaner to remove
deposits from heating surfaces A of
the heat exchanger.

2. If required, rinse heating surfaces

A

with water.

3. Check condensate drain and clean
siphon. See the following chapter.

Checking the condensate drain and cleaning the siphon

A

B

C

Flue gas cascade:

Clean the siphon in the flue gas header
as well.

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

2.

Remove retaining clip A.

3.

Pull filler pipe B upwards.

4.

Remove trap C downwards.

5. Remove the condensate hose from
trap C.

6. Clean the siphon.

7. Fill siphon with water and reassemble

with retaining clip A.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

63

8. Check that the condensate pipe is

connected correctly to the siphon and
heat exchanger.

Note

Route the drain hose without any
bends and with a constant fall.

Installing the burner

G

B

D

C

E

4x

FF

A

1. Install the burner and tighten screws

G

diagonally with 8.5 Nm.

2.

Fit gas supply pipe F with a new
gasket.

3. Check the gas connections for tight­ness.

Danger

Escaping gas leads to a risk of

explosion.
Check all fittings for gas tight­ness.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

64

4.

Connect cables from fan motor A,
gas train B, ionisation electrode

C

, ignition unit D and earth tab

E

.

Checking the anode connection

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

1.

2.

A

Magnesium anode

B

Earth cable

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

65

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.

1.

Remove cover A.

2.

Remove earth cable B from tab
C

.

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

■ If the current measures > 0.3 mA

the anode is OK.

■ If the current measures < 0.3 mA or

if there is no current at all, inspect
the anode visually (see page 68).

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

66

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: To drain the
heating system but not the cylinder
via the cold water connection.

■

Lever position C: To drain the
heating system and the cylinder via
the hot water connection. Cold
water connection remains filled.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

67

Cleaning the primary store

Note

According to EN 806, a visual inspection
and (if necessary) cleaning must be car­ried out no later than two years after
commissioning and thereafter as
required.

2.

1. Drain the primary store.

2.

Remove flange cover A.

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

4. Remove loose deposits with a high
pressure cleaner.

!

Please note

When cleaning the inside,
only use plastic cleaning uten-

sils.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

68

5. 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.

6. Thoroughly flush the primary store
after cleaning.

Checking and replacing the magnesium anode (if required)

Check the magnesium anode. If the
anode has degraded to between 10 and
15 mm Ø, we recommend replacing the
magnesium anode.

Re-assembling and filling the primary store

2.

1. Reconnect the primary store to the
pipework.

2.

Insert new gasket A underneath
flange cover B.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

69

3.

Fit flange cover B and tighten eight
screws D with a maximum torque of
25 Nm.

4.

Push earth cable C onto the tab.

5.

Fit cover E.

6. Fill the primary store with potable
water.

Checking the diaphragm expansion vessel and system pressure

A

Note

(GB only) The diaphragm expansion
vessel can lose some charge pressure
over a time in use. When the boiler heats
up, the pressure gauge will indicate a
higher pressure of 2 or 3 bar (0.2 or

0.3 MPa). The safety valve too can
respond and discharge excess pres­sure.

Check whether the installed diaphragm
expansion vessel is adequate for the
system water volume. (GB only)

Note

Carry out this test on a cold system.

1. Drain the system until the pressure
gauge shows "0".

2. If the diaphragm expansion vessel
pre-charge pressure is lower than the
static system pressure: Top up with
nitrogen at connection A until the
pre-charge pressure is 0.1 to 0.2 bar
(10 to 20 kPa) higher than the static
system pressure.

3. Top up with water until the charge
pressure of the cooled system is 0.1
to 0.2 bar (10 to 20 kPa) higher than
the pre-charge pressure of the dia­phragm expansion vessel.
Permiss. operating pressure: 3 bar
(300 kPa).

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

70

Checking the pre-charge pressure and the DHW expansion ves­sel (if installed)

A

1. Check the static pressure of the DHW
line downstream of the pressure
reducer and adjust if required. Set
value: max. 3.0 bar (0.3 MPa).

2. Close the on-site shut-off valve in the
cold water line.

3.

Turn operating lever of valve A to
the "front" position.

4. Check the pre-charge pressure of the
DHW expansion vessel and adjust if
required. Set value: Static pressure
minus 0.2 bar (0.02 MPa).

5.

Turn operating lever of valve A back
to the "left" position and open the on­site shut-off valve in the cold water
line.

Checking all gas equipment for tightness at operating pressure

Danger

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

Note

Only use suitable and approved leak
detection agents (EN 14291) and devi­ces for the tightness test. Leak detection
agents with unsuitable constituents
(e.g. nitrites, sulphides) can cause mate­rial damage.
Remove residues of the leak detection
agent after testing.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

71

Checking the combustion quality

The electronic combustion controller
automatically ensures optimum combus­tion quality. During commissioning/
maintenance, only the combustion val­ues need to be checked. For this, meas­ure the CO content and the CO2 or O

2

content. For a description of the elec­tronic combustion controller functions,
see page 168.

Note

Operate the appliance with uncontami­nated combustion air to prevent operat­ing faults and damage.

CO content

■ The CO content must be < 1000 ppm
for all gas types.

CO2 or O2 content

■ The CO2 content must be within the
following limits for upper and lower

heating output respectively:
– 7.5 to 9.5 % for natural gas E and LL
– 8.8 to 11.1 % for LPG P

■ For all gas types, the O2 content must
be between 4.0 and 7.6 %.

If the actual CO2 or O2 values lie outside
their respective ranges, proceed as fol-

lows:

■ Check the balanced flue system for
tightness, see page 58.

■ Check the ionisation electrode and
connecting cable, see page 61.

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 port A on the boiler flue con­nection.

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

3. Set the lower heating output (see
page 72).

4. Check the CO2 content. Should the
actual value deviate from the afore-

mentioned ranges by more than 1 %,
implement steps on page 71.

5. Enter the actual values into the
report.

6. Set the upper heating output (see
page 72).

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

72

7. Check the CO2 content. Should the

actual value deviate from the afore­mentioned ranges by more than 1 %,
implement steps on page 71.

8. After testing, press OK.

9. Enter the actual values into the

report.

Select higher/lower heating output

Service menu

1. Press OK and å simultaneously for

approx. 4 s.

2. "Actuator test"

3. Select the lower heating output:
Select "Base load OFF". Then "Base
load ON" appears and the burner
operates at its lower heating output.

4. Select the upper heating output:
Select "Full load OFF". Then "Full
load ON" appears and the burner
operates at its upper heating output.

5. Ending output selection:
Press ä.

Matching the control unit to the heating system

The control unit must be adjusted subject
to the system equipment level.

■ To do this, select the relevant system
scheme (see the following diagrams).

■ Set the codes in conjunction with the
accessories fitted.

Accessories installation and
service instructions

Note

Various system components are auto­matically recognised by the control unit
and the codes are automatically adjus­ted.
For individual coding steps, see
page 85.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

73

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 Group

Operation with LPG 82:1 "General"
System with DHW circulation pump:
DHW circulation pump connected at internal exten­sion H1 or H2

— —

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

74

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 to restrict 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 Group

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

00:4 "General"

System with DHW circulation pump:
DHW circulation pump connected at internal exten­sion H1 or H2

— —

System with low loss header 04:0 "Boiler"

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

75

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 to restrict 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

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.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

76

Function/system components Code

Adjust Group

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

00:4 "General"

System with DHW circulation pump:
DHW circulation pump connected at internal exten­sion H1 or H2

— —

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 to restrict 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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

77

wQ

Collector temperature sensor

Function/system components Code

Adjust Group

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

00:4 "General"

System with DHW circulation pump:
DHW circulation pump connected at internal exten­sion H1 or H2

— —

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

78

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 to restrict the
maximum temperature of underfloor
heating systems

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 Group

Operation with LPG 82:1 "General"
System with only two heating circuits with mixer, with
extension kit for mixer (without unregulated heating
circuit) with DHW heating

00:8 "General"

System without DHW circulation pump:
Heating circuit pump A1 connected at internal exten­sion H1 or H2

53:2 —

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

— —

DHW circulation pump connected at extension AM1,
terminal A2
or

— —

DHW circulation pump connected at internal exten­sion H1 or H2

— —

System with low loss header 04:0 "Boiler"

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 boiler water or flow temperature in
turn affects the room temperature.

Settings in the delivered condition:

■ Slope = 1.4

■ Level = 0

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

79

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 is adjusta­ble via coding address "9F" in the "Gen-
eral" group.

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

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

Slope setting ranges:

■ Underfloor heating systems: 0.2 to 0.8

■ Low temperature heating systems: 0.8
to 1.6

Selecting the set room temperature

Individually adjustable for each heating
circuit.

The heating curve is offset along the axis
of the set room temperature. With the
heating circuit pump logic function ena­bled, the curve modifies the starting and
stopping characteristics of the heating
circuit pump.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

80

Standard set room temperature

90

-20

26 + 20

A

C

D

E

B

Example 1: Adjustment of the standard
set 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"

Changing the standard set room temper­ature

Operating instructions

Reduced set room temperature

+20 14 5

90

-20

D E

A

C

B

Example 2: Adjustment of the reduced
set 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"

Changing the reduced set room temper­ature

Operating instructions

Changing the slope and level

Individually adjustable for each heating
circuit.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

81

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.

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 200 (example)

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

Note

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

82

All coding addresses in the table are listed in the "General" group.
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".

Control unit receives
the time,
Set code "81:3".

Control unit receives
the time,
Set code "81:3".

Device re-

ceives the

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

Control unit receives
outside tempera­ture,
Set code "97:1".

Control unit receives
outside tempera­ture,
Set code "97:1".

—

Viessmann system
number,
Code "98:1".

Viessmann system
number,
Code "98:1".

Viessmann system
number,
Code "98:1".

—

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

The subscriber check is used to test
communication with the system devices
connected to the fault manager.

Preconditions:

■ The control unit must be programmed

as fault manager (code "79:1" in the
"General" group).

■ The LON subscriber number must be

programmed in all control units.

■ The LON subscriber list in the fault

manager must be up to date.

Service menu:

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

2. "Service functions"

3. "Subscriber check"

4. Select subscriber (e.g. subscriber 10).

5. Start the subscriber check with "OK".

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

83

■ 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
"Delete list?" (subscriber list is upda­ted).

Note

During the subscriber check, the display
for the relevant subscriber shows the
subscriber no. and "Wink" for approx.
1 min.

Scanning and resetting the "Service" display

After the limits specified in coding
addresses "21" and "23" in the "Boiler"
group have been reached, the red fault
indicator flashes and "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
(resetting service)

1. Press OK and å simultaneously

for approx. 4 s.

2. "Service functions"

3. "Service reset"

Note

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

Fitting the cover panel and front panels

■

Fit the cover panel; see position A in
diagram on page 48.

■ Fit the front panels; see page 41.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

Service

84

Instructing the system user

The system installer should hand the
operating instructions to the system user
and instruct the user in operating the
system.
This includes all components installed as
accessories, e.g. remote control units. In
addition, the system installer must make
the user aware of the required mainte­nance work.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5773 238 GB

85

■ On control units for weather-compen­sated operation codes are displayed
as plain text.

■ Codes that have not been assigned a
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
labelled "Heating circuit 1" and the
heating circuits with mixer are labelled

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

If the heating circuits were individually
named, the selected name and
"HC1", "HC2" or "HC3" appears
instead.

1. Press OK and å simultaneously

for approx. 4 s.

2. "Coding level 1"

3. Select the required coding address

group:

■ "General"

■ "Boiler"

■ "DHW"

■ "Solar"

■ "Heating circuit 1/2/3"

■ "All codes std device"
In this group, all coding addresses
from coding level 1 (except coding
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 at coding level

2.

"General"

Select group "General" (see page 85).

Code 1

Calling up coding level 1

5773 238 GB

Service

86

Coding

Coding in the delivered condition Possible change
System design

00:2 One heating circuit with-

out mixer A1 (heating cir­cuit 1)

00:4
to
00:10

For system schemes, see
the following table:

Value ad­dress
00: ...

Description

2 One heating circuit without mixer A1 (heating circuit 1) (code is set au-

tomatically)
4 One heating circuit with mixer M2 (heating circuit 2)
6 One heating circuit without mixer A1 (heating circuit 1)

One heating circuit with mixer M2 (heating circuit 2)

(code is set automatically)
8 One heating circuit with mixer M2 (heating circuit 2)

One heating circuit with mixer M3 (heating circuit 3)
10 One heating circuit without mixer A1 (heating circuit 1)

Two heating circuits with mixer M2 (heating circuit 2) and M3 (heating

circuit 3)

(code is set automatically)

Code 1

"General"

(cont.)

5773 238 GB

87

Coding in the delivered condition Possible change
Internal circulation pump function

51:0 Internal circulation pump

always starts when there
is a heat demand

51:1 System with low loss head-

er:
When there is a heat de­mand, the internal circula­tion pump is only started if
the burner is operational.
Circulation pump is switch­ed off on expiry of run-on
time.

51:2 System with heating water

buffer cylinder:
When there is a heat de­mand, the internal circula­tion pump is only started if
the burner is operational.
Circulation pump is switch­ed off on expiry of run-on
time.

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 - 97 = Vitotronic 200-H
98 = Vitogate
99 = Vitocom

Detached house/apartment building

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

Holiday program and time
program for DHW heating
can be set separately

Code 1

"General"

(cont.)

5773 238 GB

Service

88

Coding in the delivered condition Possible change
Lock out controls

8F:0 Operation enabled in

standard menu and ex­tended menu.

Note

The respective code is
only activated when you
exit the service menu.

8F:1 Operation blocked in

standard menu and exten­ded menu.
Emissions test mode can
be enabled.

8F:2 Operation enabled in

standard menu and
blocked in extended
menu.
Emissions test mode can
be enabled.

Set flow temperature for external demand

9b:70 Set flow temperature for

external demand 70 °C

9b:0
to
9b:127

Set value adjustable from 0
to 127 °C (limited by boiler­specific parameters)

"Boiler"

Select group "Boiler" (see page 85).

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 interval for burner

service

23:1
to
23:24

Interval adjustable from 1
to 24 months

Code 1

"General"

(cont.)

5773 238 GB

89

Coding in the delivered condition Possible change
Service status

24:0 "Service" not shown on

display

24:1 "Service" is shown on dis-

play (the address is auto­matically set and must be
manually reset after the
service)

Filling/Venting

2F:0 Venting program/fill pro-

gram disabled

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

"DHW"

Select group "DHW" (see page 85).

Coding

Coding in the delivered condition Possible change
Set DHW temperature reheating suppression

67:40 For solar DHW heating:

Set DHW temperature
40 °C. DHW reheating is
suppressed above the
selected set temperature.
(DHW heating by the boil­er only if solar energy is
not sufficient).

67:0
to
67:95

Set DHW temperature ad­justable from 0 to 95 °C
(limited by boiler-specific
parameters).
Observe the setting of cod­ing address "56".

Enable DHW circulation pump

73:0 DHW circulation pump:

"ON" according to time
program

73:1
to
73:6

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

73:7 Constantly "ON"

"Solar"

Select group "Solar" (see page 85).

Code 1

"Boiler"

(cont.)

5773 238 GB

Service

90

Coding

Coding in the delivered condition Possible change
Speed control solar circuit pump

02:1 Solar circuit pump (multi

stage) is speed-control­led with wave packet con­trol.

02:0 Solar circuit pump (multi

stage) is not speed-control­led.

02:2 Do not adjust

Cylinder maximum temperature

08:60 Set DHW temperature

(maximum cylinder tem­perature) 60 °C.

08:10
to
08:90

Set DHW temperature ad­justable from 10 to 90 °C.

Stagnation time reduction

0A:5 Temperature differential

for stagnation time reduc­tion (reduction in the
speed of the solar circuit
pump to protect system
components and heat
transfer medium) 5 K.

0A:0 Stagnation time reduction

is disabled.
0A:1
to
0A:40

Temperature differential

adjustable from 1 to 40 K.

Flow rate solar circuit

0F:70 The flow rate of the solar

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

0F:1
to
0F:255

Flow rate adjustable from

0.1 to 25.5 l/min.

1 step ≙ 0.1 l/min.

"Heating circuit ..."

Select group "Heating circuit ..." (see
page 85).

Code 1

"Solar"

(cont.)

5773 238 GB

91

Coding

Coding in the delivered condition Possible change
Economy function outside temperature

A5:5 With heating circuit pump

logic function (economy
control): 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 fol-

lowing 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

Coding in the delivered condition Possible change
Extended economy function adjusted outside temperature

A6:36 Extended economy mode

disabled

A6:5
to
A6:35

Extended economy control

enabled, i.e. the burner and

heating circuit pump stop

and the mixer is closed at a

variable value, adjustable

between 5 and 35 °C plus

1 °C. The base value is the

adjusted outside tempera-

ture. This value is based on

the actual outside temper-

ature and a time constant

which takes into account

the cooling down of an

average building.

Code 1

"Heating circuit ..."

(cont.)

5773 238 GB

Service

92

Coding in the delivered condition Possible change
Extended economy function mixer

A7:0 Only for heating circuit

with mixer:
Without mixer economy
function

A7:1 With mixer economy func-

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

■ If the mixer has been
closed for longer than
20 min.

Heating circuit pump
"ON":

■ If the mixer changes to
control function

■ If there is a risk of frost

Pump idle time, transition reduced mode

A9:7 With pump idle time:

Heating circuit pump
"OFF" if set value is modi­fied 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.
1 = short idle time
15 = long idle time

Weather-compensated/room temperature hook-up

b0:0 Only for heating circuit

with mixer and remote
control:
Heating mode/reduced
mode: Weather-compen­sated

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

Code 1

"Heating circuit ..."

(cont.)

5773 238 GB

93

Coding in the delivered condition Possible change
Economy function room temperature

b5:0 Only for heating circuit

with mixer and remote
control:
Without room tempera­ture-dependent heating
circuit pump logic func­tion

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

Coding in the delivered condition Possible change
Min. flow temperature heating circuit

C5:20 Electronic minimum flow

temperature limit 20 °C
(only in operation with
standard room tempera­ture)

C5:1
to
C5:127

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

Max. flow temperature heating circuit

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)

Code 1

"Heating circuit ..."

(cont.)

5773 238 GB

Service

94

Coding in the delivered condition Possible change
Heating program - changeover

d5:0 With external operating

program changeover (ob­serve setting for coding
addresses "3A", "3b" and
"3C" in the "General"
group).
Operating program
switches to "Constant
central heating with re­duced room tempera­ture" or "Standby mode"
(subject to the setting of
the set reduced room
temperature).

d5:1 The operating program

switches to "Constant op­eration with standard room
temperature".

Ext. heating program changeover to heating circuit

d8:0 With extension EA1:

No operating program
changeover.

d8:1 Operating program

changeover via input DE1.

d8:2 Operating program

changeover via input DE2.

d8:3 Operating program

changeover via input DE3.

Max. pump speed in standard mode

E6:... Only for heating systems

without a heating circuit
with mixer:
Maximum speed of the in­ternal variable speed
heating circuit pump in %
of the max. speed in
standard mode. Value is
specified by boiler-specif­ic parameters (only for
weather-compensated
control units).

E6:0
to
E6:100

Maximum speed adjusta­ble from 0 to 100 %

Code 1

"Heating circuit ..."

(cont.)

5773 238 GB

95

Coding in the delivered condition Possible change
Min. pump speed

E7:30 Only for heating systems

without a heating circuit
with mixer:
Minimum speed of the in­ternal variable speed
heating circuit pump:
30 % of the max. speed
(only for weather-com­pensated control units)

E7:0
to
E7:100

Minimum speed adjustable
from 0 to 100 % of the max­imum speed

Screed function

F1:0 Screed drying disabled. F1:1

to
F1:6

Only for heating circuit with
mixer:
6 different temperature/
time profiles can be selec­ted for screed drying (see
page 163)

F1:15 Constant flow temperature

20 °C

Party mode time limit

F2:8 Time limit for party mode

or external operating pro­gram changeover via but­ton: 8 h

*1

Note

Observe settings of cod­ing addresses "3A", "3b"
and "3C" in group "Gen-
eral", as well as "d5" and
"d8" in group "Heating
circuit...".

F2:0

No time limit.

*1

F2:1
to
F2:12

Time limit adjustable from 1
to 12 h

*1

*1

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

Code 1

"Heating circuit ..."

(cont.)

5773 238 GB

Service

96

Coding in the delivered condition Possible change
Start temperature raising

F8:–5 Temperature limit for ter-

minating reduced mode
–5 °C, see example on
page 165.
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 set reduced room
temperature –14 °C, see
example on page 165.

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

Set flow temperature increase

FA:20 Raising the set boiler wa-

ter or flow temperature by
20 % when changing
from operation with re­duced room temperature
to operation with stand­ard room temperature.
See example on
page 166.

FA:0
to
FA:50

Temperature rise adjusta­ble from 0 to 50 %

Duration set flow temperature increase

Fb:60 Duration of the set boiler

water or flow temperature
rise (see coding address
"FA") 60 min. See exam­ple on page 166.

Fb:0
to
Fb:300

Duration adjustable from 0
to 300 min.

Code 1

"Heating circuit ..."

(cont.)

5773 238 GB

97

■ All codes are accessible in coding
level 2.

■ Codes that have not been assigned a
function due to the heating system
equipment level or the setting of other
codes are not displayed.

■ The heating circuit without mixer is
labelled "Heating circuit 1" and the
heating circuits with mixer are labelled

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

If the heating circuits were individually
named, the selected name and
"HC1", "HC2" or "HC3" appears
instead.

1. Press OK and å simultaneously

for approx. 4 s.

2. Press OK and simultaneously for

approx. 4 s.

3. "Coding level 2"

4. Select the required coding address

group:

■ "General"

■ "Boiler"

■ "DHW"

■ "Solar"

■ "Heating circuit 1/2/3"

■ "All codes std device"
In this group, all coding addresses
from coding level 1 (except 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 at coding level

1.

"General"

Select group "General" (see page 97).

Code 2

Calling up coding level 2

5773 238 GB

Service

98

Coding

Coding in the delivered condition Possible change

00:2 One heating circuit with-

out mixer A1 (heating cir­cuit 1)

00:4
to
00:10

For system schemes, see
the following table:

Value ad­dress
00: ...

Description

2 One heating circuit without mixer A1 (heating circuit 1) (code is set au-

tomatically)
4 One heating circuit with mixer M2 (heating circuit 2)
6 One heating circuit without mixer A1 (heating circuit 1)

One heating circuit with mixer M2 (heating circuit 2)

(code is set automatically)
8 One heating circuit with mixer M2 (heating circuit 2)

One heating circuit with mixer M3 (heating circuit 3)
10 One heating circuit without mixer A1 (heating circuit 1)

Two heating circuits with mixer M2 (heating circuit 2) and M3 (heating

circuit 3)

(code is set 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

2A:0 Without wireless outside

temperature sensor

2A:1 With wireless outside tem-

perature sensor (automatic
recognition)

2A:2 Wireless outside tempera-

ture sensor not used
2d:0 Do not adjust
32:0 Without extension AM1 32:1 With extension AM1 (auto-

matic recognition)
33:1 Function output A1 at ex-

tension AM1:
Heating circuit pump

33:0 DHW circulation pump
33:2 Circulation pump for cylin-

der heating
34:0 Function output A2 at ex-

tension AM1:
DHW circulation pump

34:1 Heating circuit pump
34:2 Circulation pump for cylin-

der heating

Code 2

"General"

(cont.)

5773 238 GB

99

Coding in the delivered condition Possible change

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 Feed pump
36:2 DHW circulation pump

3A:0 Function input DE1 at ex-

tension EA1:
No function

3A:1 Operating program

changeover

3A:2 External demand with set

flow temperature.
Set value setting: Coding
address "9b" in this group.
Internal circulation pump
function: Coding address
"3F" in this group.

3A:3 External blocking.

Internal circulation pump
function: Coding address
"3E" in this group.

3A:4 External blocking with fault

message input.
Internal circulation pump
function: Coding address

"3E" in this group.
3A:5 Fault message input
3A:6 Brief operation, DHW cir-

culation pump (pushbutton

function).

DHW circulation pump run-

time adjustment: Coding

address "3d" in this group

3b:0 Function input DE2 at ex-

tension EA1:
No function

3b:1 Operating program

changeover
3b:2 External demand with set

flow temperature.

Set value setting: Coding

address "9b" in this group.

Internal circulation pump

function: Coding address

"3F" in this group.
3b:3 Function input DE2: Exter-

nal blocking.

Code 2

"General"

(cont.)

5773 238 GB

Service

100

Coding in the delivered condition Possible change

Internal circulation pump
function: Coding address
"3E" in this group.

3b:4 Function input DE2: Exter-

nal blocking with fault mes­sage input
Internal circulation pump
function: 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

3C:0 Function input DE3 at ex-

tension EA1:
No function

3C:1 Operating program

changeover

3C:2 External demand with set

flow temperature.
Set value setting: Coding
address "9b" in this group.
Internal circulation pump
function: Coding address
"3F" in this group.

3C:3 External blocking.

Internal circulation pump
function: Coding address
"3E" in this group.

3C:4 External blocking with fault

message input
Internal circulation pump
function: Coding address

"3E" in this group.
3C:5 Fault message input
3C:6 Brief operation, DHW cir-

culation pump (pushbutton

function).

Code 2

"General"

(cont.)

5773 238 GB