Viessmann Vitodens 200-W, Type B2HA, Vitodens 200-W B2HA Installation And Service Instructions Manual

Installation and service
instructions

for contractors

VIESMANN

Vitodens 200-W
Type B2HA, 125 and 150 kW

Wall mounted gas condensing boiler
Natural gas and LPG version

For applicability, see the last page

VITODENS 200-W

5623 520 GB 6/2012

Please keep safe.

2

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

Safety instructions explained

Danger

This symbol warns against the
risk of injury.

!

Please note

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

Note

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

Target group

These instructions are exclusively
designed for qualified personnel.

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

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

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

Regulations

Observe the following when working on
this system

■ all legal instructions regarding the pre­vention of accidents,

■ all legal instructions regarding envi­ronmental protection,

■ the Code of Practice of relevant trade
associations,

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

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

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

– the Water Fittings Regulation or

Water Bylaws in Scotland,

– the current I.E.E. Wiring Regula-

tions.

If you smell gas

Danger

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

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

■ Close the gas shut-off valve.

■ Open windows and doors.

■ Remove all people from the
danger zone.

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

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

Safety instructions

Safety instructions

5623 520 GB

3

If you smell flue gas

Danger

Flue gas can lead to life-threat­ening poisoning.

■ Shut down the heating system.

■ Ventilate the boiler room.

■ Close all doors leading to the
living space.

Working on the system

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

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

■ Safeguard the system against unau­thorised reconnection.

!

Please note

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

Repair work

!

Please note

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

Ancillary components, spare and
wearing parts

!

Please note

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

Safety instructions

Safety instructions

(cont.)

5623 520 GB

4

Installation instructions

Preparing for installation

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

Preparing for installation....................................................................................... 7

Installation sequence

Fitting the boiler and making connections............................................................ 9

Heating water side connection............................................................................. 13

Flue gas connection............................................................................................. 13

Condensate connection........................................................................................ 14

Gas connection.................................................................................................... 15

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

Electrical connections........................................................................................... 17

Closing the control unit casing and inserting the programming unit..................... 27

Service instructions

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance.......................................... 28

Further details regarding the individual steps....................................................... 30

Code 1

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

General/group "1"................................................................................................. 67

Boiler/group "2".................................................................................................... 70

DHW/group "3"..................................................................................................... 70

Solar/group "4"..................................................................................................... 71

Heating circuit 1, heating circuit 2, heating circuit 3/group "5"............................. 73

Code 2

Calling up coding level 2...................................................................................... 80

General/group "1"................................................................................................. 81

Boiler/group "2".................................................................................................... 90

DHW/group "3"..................................................................................................... 92

Solar/group "4"..................................................................................................... 94

Heating circuit 1, heating circuit 2, heating circuit 3/group "5"............................. 98

Diagnosis and service scans

Calling up the service level................................................................................... 107

Diagnosis.............................................................................................................. 108

Checking outputs (relay test)................................................................................ 114

Index

Index

5623 520 GB

5

Troubleshooting

Fault display......................................................................................................... 117

Fault codes........................................................................................................... 119

Repair................................................................................................................... 135

Function description

Constant temperature control unit........................................................................ 143

Weather-compensated control unit...................................................................... 144

Internal extensions (accessories)......................................................................... 145

External extensions (accessories)........................................................................ 148

Control functions.................................................................................................. 152

Assigning heating circuits to the remote control................................................... 160

Electronic combustion control unit........................................................................ 160

Designs

Connection and wiring diagram – internal connections ....................................... 162

Connection and wiring diagram – external connections....................................... 163

Parts lists

Ordering parts...................................................................................................... 165

Overview of the assemblies................................................................................. 166

Casing assembly.................................................................................................. 167

Heat cell assembly............................................................................................... 168

Burner assembly.................................................................................................. 169

Hydraulic assembly.............................................................................................. 169

Control unit assembly........................................................................................... 170

Miscellaneous....................................................................................................... 171

Commissioning/service reports

............................................................................................................................. 173

Specification....................................................................................................... 174

Certificates

Declaration of conformity...................................................................................... 175

Manufacturer's certificate according to the 1st BImSchV [Germany]................... 175

Keyword index.................................................................................................... 176

Index

Index

(cont.)

5623 520 GB

6

Vitodens 200-W, B2HA

Preset for operation with natural gas E and LL.
For conversion to LPG P (without conversion kit), see page 37.

Conversion for other countries

The Vitodens 200-W should generally only be delivered to those countries specified
on the type plate. For deliveries to alternative countries, an approved contractor, on
his own initiative, must arrange individual approval in accordance with the law of the
land.

Multi boiler system

In connection with the installation of a multi boiler system observe the installation
instructions of the multi boiler system accessories.

Preparing for installation

Product information

5623 520 GB

7

Dimensions and connections

!

Please note

To prevent equipment damage,

install all pipework free of load
and torque stresses.

165.5

165.5

923

1440

95

689

278

905

600

P

40

200

855

1975

1950

E

L

M

O

K

H

N

A
B

C

G

D

F

70 70

195

A

Safety valve

B

Expansion vessel connection G1

C

Boiler flow 7 54 mm

D

Cylinder flow 7 42 mm

E

Gas connection R 1

F

Cylinder return 7 42 mm

Preparing for installation

Preparing for installation

5623 520 GB

Installation

8

G

Boiler return 7 54 mm

H

Connection sets (accessories,
shown without the thermal insula­tion supplied)

K

Cable entry area at the back

L

Without connection set (accesso­ries)

M

With connection set (accessories)

N

Recommended dimension (single
boiler system without mounting
frame)

O

Recommended dimension (multi
boiler system and single boiler sys­tem with mounting frame)

P

Condensate drain

Preparing for the boiler installation

Note

This boiler (protection IP X4 D) is
approved for installation in wet rooms
inside safety zone 1 according to
DIN VDE 0100 [Germany], if hosed
water can be prevented.
Observe DIN VDE 0100 [or local regula­tions].

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

2. Prepare gas connection to TRGI [or
local regulations].

3. Prepare the electrical connections.

■

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

■ Accessory cables: NYM with the

required number of conductors for
the external connections.

■

Allow all cables in area "K" to pro­trude 1400 mm from the wall.

Preparing for installation

Preparing for installation

(cont.)

5623 520 GB

9

Removing boiler from packaging and levelling

2x

3.

1.

2..

4.

1. Remove packing cushions and keep
them safe.
They are used as a support during
levelling.

2. Undo two screws on the underside.

3. Remove front panel.

4. Push packing cushions onto the

underside of the boiler.

Installation sequence

Fitting the boiler and making connections

5623 520 GB

Installation

10

A

5.

A

7 9 mm drilled holes for attaching
lifting gear

5.

!

Please note

To prevent damage,
do not level boiler without
packing cushions.

Level boiler with pallet.

Installation sequence

Fitting the boiler and making connections

(cont.)

5623 520 GB

11

Fitting the wall mounting bracket

Note

The enclosed screws and rawl plugs are
only suitable for concrete. For other con­struction materials, use fixings that are
suitable for 145 kg loads.

1975

Ø 12

B

C

D

A

2.

1.

A

Reference point: boiler top edge

B

Installation template (included with
the boiler)

C

Top edge finished floor

D

Recommendation

Installation sequence

Fitting the boiler and making connections

(cont.)

5623 520 GB

Installation

12

Hooking the boiler into the wall mounting bracket and levelling
it

1.

3.

2x

3.

2.

Installation sequence

Fitting the boiler and making connections

(cont.)

5623 520 GB

13

A

B

C

D

E

A

Expansion vessel connection

B

Boiler flow

C

Cylinder flow

D

Cylinder return

E

Boiler return

Note

Residual water may escape when undo­ing the locking caps.

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.

Installation sequence

Heating water side connection

5623 520 GB

Installation

14

A

1. Only for open flue operation:
Remove outer gasket A (ventilation
air).

2. Connect flue pipe or flue ventilation
air pipe.

Flue system installation instruc­tions.

Condensate connection

Connect the condensate hose with a
constant fall and a pipe vent to the public
sewage system or to a neutralising sys­tem.

Installation sequence

Flue gas connection

(cont.)

5623 520 GB

15

A

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.

Seal in gas shut-off valve A into the
gas supply pipe.

2. Carry out a tightness test.

Note

Only use suitable and approved leak
detecting 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.

!

Please note

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

3. Vent the gas line.

Conversion to other gas types:
Service instructions

Opening the control unit casing

!

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.

Installation sequence

Gas connection

5623 520 GB

Installation

16

3.

2.

2x

1.

4.
4x

5.

Installation sequence

Opening the control unit casing

(cont.)

5623 520 GB

17

L N

230V~ 230V~

5

96

40

40962035100

1LN

X4

2 1

2

1

32 15 4

X3

LN

21

M

1~

X19

X14

A

B

21

20

L 1

C

D

145

145

LN

M

1~

A

Radio clock receiver

B

Heating circuit pump or boiler circuit
pump

C

Vitotrol 100 UTDB (only for constant
temperature control)
When making this connection,
remove jumper between "1" and
"L".

D

Vitotrol 100 UTA (only for constant
temperature control)
or
Vitotrol 100 UTDB-RF radio clock
receiver
When making this connection,
remove jumper between "1" and
"L".

Installation sequence

Electrical connections

5623 520 GB

Installation

18

Connections at plug 230 V~

sÖ

Boiler circuit pump or heating circuit
pump, variable speed with 0 - 10 V
connection

sA

Circulation pump, optional connec­tion:

■ DHW circulation pump

■ External heating circuit pump

■ Circulation pump for cylinder
heating

fÖ

Power supply

lH

■ Power supply for accessories

■ External demand/blocking

■ Vitotrol 100 UTA

■ Vitotrol 100 UTDB

■ Vitotrol 100 UTDB-RF

Connections at LV plug

!

Outside temperature sensor

?

Flow temperature sensor for low
loss header (accessories)

%

Cylinder temperature sensor (part
of the DHW cylinder connection
set)

aVG

KM BUS subscriber (accessory)

■ Vitotrol 200A or 300A remote
control

■ Vitocom 100

■ Extension kit for one heating cir­cuit with mixer

■ Solar control module, type SM1

■ Vitosolic

■ Extension AM1

■ Extension EA1

■ Wireless base station

Information on connecting
accessories

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

Circulation pump at plug sÖ:

A

1~

M

sÖ

L

N

?

x4

B

A

Circulation pump

B

Only with variable speed heating cir­cuit pump:
Plug in 0 - 10 V connection at X4.

Rated current 2(1) A~
Rated voltage 230 V~

Installation sequence

Electrical connections

(cont.)

5623 520 GB

19

Circulation pump at plug sA:

A

1~

M

sA

L

N

?

A

Circulation pump

Rated current 2(1) A~
Rated voltage 230 V~

Set function of connected component
in coding address "39"
Function Code

DHW circulation pump 39:0
Heating circuit pump for
heating circuit without mixer
A1

39:1

Circulation pump for cylinder
heating (delivered condi­tion)

39:2

External demand via switching contact

Connection options:

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

■

Plug lH.

Connection

!

Please note

'Live' contacts lead to short cir­cuits or phase failure.
The external connection must be
floating.

Installation sequence

Electrical connections

(cont.)

5623 520 GB

Installation

20

Plug lH

Extension EA1

A

lH

N

?

1

L

A

Floating contact
When making this connec­tion, remove jumper be­tween 1 and L.

B

[{S

DE

[{D

DE

[{A

DE

A

A

Floating contact

B

Extension EA1

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").

Codes

Plug lH

Extension EA1

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

group "General"/"1" to 2.

■ Select effect of the function on the relevant heating circuit pump in coding address
"d7" in group "Heating circuit"/"5".

■ Select effect of the function on the circulation pump for cylinder heating in 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.)

5623 520 GB

21

L

?

N

L

?

N

fÖ

S

P

aBJ

230 V~

Ö

[{{]

0-10V

f-]

A

=

0-10 V



+

1 2

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).

!

Please note

'Live' contacts lead to short cir­cuits or phase failure.
The external connection must be
floating.

Installation sequence

Electrical connections

(cont.)

5623 520 GB

Installation

22

Plug lH

Extension EA1

A

lH

N

?

1

L

A

Floating contact
When making this connection, re­move jumper between 1 and L.

B

[{SDE[{D

DE

[{A

DE

A

A

Floating contact

B

Extension EA1

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

!

Please note
When blocked, there is no frost
protection for the

heating system.

Codes

Plug lH

Extension EA1

"4b:2" in group "General"/"1" Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) in

group "General"/"1" to 3 or 4.

■ Select effect of the function on the heating circuit pump in coding address "d6" in
group "Heating circuit"/"5".

■ Select effect of the function on the circulation pump for cylinder heating in coding
address "5E" in group "DHW"/"3".

Outside temperature sensor

!

Fitting outside temperature sensor RF
(wireless accessory):

Wireless base station

Installation sequence

Electrical connections

(cont.)

5623 520 GB

23

Fitting location for outside tempera­ture sensor

■ North or north-westerly wall, 2 to

2.5 m above ground level; in multi
storey buildings, in the top 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 up to 35 m with a
cross-section of 1.5 mm

2

Power supply for accessories at plug

lH

230 V~
Where the boiler is installed in a wet
area, the connection of accessories to
the power supply must not be carried out
at the control unit. The power supply
connection for accessories can be made
immediately at the control unit, if the
boiler is installed outside wet areas. 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.)

5623 520 GB

Installation

24

Connection of accessories

Power supply of all accessories via the boiler 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

Boiler control unit

B

Extension kit for heating circuit with
mixer M2

C

Extension kit for heating circuit with
mixer M3

D

Extension AM1, EA1 and/or solar
control module, type SM1

E

ON/OFF switch

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

Accessories Internal fuse

protection

Extension kit for heat­ing circuit with mixer

2 A

Extension AM1 4 A
Extension EA1 2 A
Solar control module,
type SM1

2 A

Installation sequence

Electrical connections

(cont.)

5623 520 GB

25

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".

■ 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.
Furthermore, we recommend instal­ling an AC/DC-sensitive RCD (RCD
class B ) for DC (fault) currents
that can occur with energy efficient
equipment.

■ Max. fuse rating 16 A.

Installation sequence

Electrical connections

(cont.)

5623 520 GB

Installation

26

Routing the connecting cables

!

Please note

If connecting cables touch hot components they will be damaged.
When routing and securing connecting cables on site, ensure that the maxi­mum permissible temperatures for these cables are not exceeded.

5

A

Low voltage connections

B

230 V connections

C

Internal extension

D

Main PCB

E

Communication module

F

Cable grommet for power cable

%

Plugs for connecting the cylinder
temperature sensor to the cable har­ness

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

7

14 mm). Secure the cable with the
cable grommet plugged into the lower
casing section F (black).

Installation sequence

Electrical connections

(cont.)

5623 520 GB

27

1.

3.

2x

2.

4.

4.

6.

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

Note

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

Wall mounting base installation
instructions

Installation sequence

Closing the control unit casing and inserting the programming unit

5623 520 GB

Installation

28

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

Commissioning steps

Inspection steps

Maintenance steps Page

• • •

1. Opening the boiler.......................................................... 30

•

2. Filling the heating system.............................................. 31

•

3. Selecting the language (if necessary) - only for

weather-compensated control units............................. 32

• •

4. Setting the time and date (if required) - only for

weather-compensated control units............................. 33

•

5. Venting the boiler........................................................... 34

•

6. Venting the heating system........................................... 35

•

7. Filling the siphon with water......................................... 35

• • •

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

•

9. Checking the power supply

•

10. Designating heating circuits - only for weather-

compensated control units............................................ 36

• •

11. Checking the gas type.................................................... 36

•

12. Gas type conversion (only for operation with LPG).... 37

• • •

13. Function sequence and possible faults....................... 37

• • •

14. Checking the static and supply pressure..................... 39

•

15. Maximum output setting................................................ 41

•

16. Checking the balanced flue system for tightness

(annular gap check)........................................................ 42

• •

17. Removing the burner and checking the burner gasket 43

• •

18. Checking the burner gauze assembly & replacing if

required........................................................................... 44

• •

19. Checking the flue gas non-return device..................... 45

• •

20. Checking and adjusting the ignition and ionisation

electrodes........................................................................ 46

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance

5623 520 GB

29

Commissioning steps

Inspection steps

Maintenance steps Page

• •

21. Cleaning the combustion chamber/heat exchanger

and installing the burner................................................ 47

• •

22. Checking the condensate drain and cleaning the

siphon.............................................................................. 48

• •

23. Checking the neutralising system (if installed)

• •

24. Checking the diaphragm expansion vessel and

system pressure............................................................. 48

• • •

25. Checking the function of safety valves

• • •

26. Checking firm seating of electrical connections

• • •

27. Checking all gas equipment for tightness at operating

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

• • •

28. Checking combustion quality........................................ 49

• • •

29. Checking the flue system for unrestricted flow and
tightness

• • •

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

•

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

•

32. Adjusting the heating curves (only for weather-

compensated control units)........................................... 58

•

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

•

34. Calling up and resetting the "Service" display............ 62

• • •

35. Fitting the front panel..................................................... 64

•

36. Instructing the system user........................................... 65

Commissioning, inspection, maintenance

Steps - commissioning, inspection and…

(cont.)

5623 520 GB

Service

30

Opening the boiler

2x

2.

1.

4.

3.

Commissioning, inspection, maintenance

Further details regarding the individual steps

5623 520 GB

31

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

kW < 20 l/kW

≥ 20 l/kW to
< 50 l/kW

≥ 50 l/kW

≤ 50

≤ 3.0 mol/m

3

(16.8 °dH)

≤ 2.0 mol/m

3

(11.2 °dH)

< 0.02 mol/m

3

(0.11 °dH)

> 50 to ≤ 200

≤ 2.0 mol/m

3

(11.2 °dH)

≤ 1.5 mol/m

3

(8.4 °dH)

< 0.02 mol/m

3

(0.11 °dH)

> 200 to ≤ 600

≤ 1.5 mol/m

3

(8.4 °dH)

≤ 0.02 mol/m

3

(0.11 °dH)

< 0.02 mol/m

3

(0.11 °dH)

> 600

< 0.02 mol/m

3

(0.11 °dH)

< 0.02 mol/m

3

(0.11 °dH)

< 0.02 mol/m

3

(0.11 °dH)

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

32

A

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

2. Close the gas shut-off valve.

3. Connect the supply hose to boiler

drain & fill valve A.

4. Fill the heating system via boiler drain
& fill valve A. (minimum system
pressure > 1.0 bar).
Permiss. operating pressure: 6 bar.

5.

Close boiler drain & fill valve A.

Selecting the language (if necessary) - only for weather-com­pensated control units

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

Extended menu:

1. å

2. "Settings"

3. "Language"

Sprache

Cesky

CZ

Deutsch

DE

Dansk
English

DK
GB

Wählen mit

Ø

ç

4. Set the required language with / .

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

33

Setting the time and date (if required) - only for weather-com­pensated control units

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

Extended menu:

1. å

2. "Settings"

3. "Time / Date"

4. Set current time and date.

Note

When time and date have been set, the
control unit automatically checks the
function of the flue gas temperature sen­sor. The display shows: "Test flue gas
temp sensor" and "Active".
For further details regarding the flue gas
temperature sensor test, see
page 139.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

34

Venting the boiler

B

A

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

2. Connect the supply hose to boiler
drain & fill valve A.

3.

Plug the drain hose onto top tap B
and connect to a drain.

4.

Open taps A and B and vent at
mains pressure (purge) until no
sound of escaping air can be heard
and no more air bubbles are visible.

5.

Close taps A and B, open the shut-
off valves on the heating water side.

6. Remove hoses again.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

35

Venting the heating system

1. Close the gas shut-off valve and

switch the control unit ON.

2. Activate venting program (see next
steps).

Note

For function and sequence of the
venting program, see page 154.

3. Check the system pressure.

Activating the venting function

Weather-compensated control unit Constant temperature control unit

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.

Service menu

1. Press OK and å simultaneously for

approx. 4 s.

2.

Select "5" with Ú and confirm with

OK.
"ON" flashes.

3. Activate the venting function with OK.
"EL on" is shown constantly.

4. Ending venting function:
Press ä.

Filling the siphon with water

E

F

C

D

A

B

1.

Pull off cap A downwards.

2.

Undo hose B.

3.

Undo union nut C and pull off siphon
D

downwards.

4.

Fill siphon D with water and refit it.

5.

Refit hose B.

6.

Push on cap A from below.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

36

Designating heating circuits - only for weather-compensated
control units

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.

To enter names for heating circuits:

Operating instructions

Checking the gas type

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

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

15.2 kWh/m3, (34.2 to 54.7 MJ/m3).

■ Convert the burner for operation with
LPG (see "Gas type conversion" on
page 37).

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

2. Convert the burner for operation with
LPG (see page 37).

3. Record the gas type in the report on
page 173.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

37

Gas type conversion (only for operation with LPG)

1

2

A

1.

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

2. Switch ON/OFF switch "8" on.

3. Select the gas type in coding address

"82":

■ Call up code 2

■ Call up "General" (weather-com­pensated control unit)
or
Group "1" (constant temperature
control unit)

■ In coding address "11", select
value "9"

■ In coding address "82", select
value "1" (LPG operation)

■

In code "11", select value ≠ "9".

■ End service functions.

4. Open the gas shut-off valve.

5. Affix label "G 31" (included with the

technical documentation) in a clearly
visible position, near the gas train on
the cover panel.

Function sequence and possible faults

Display Measures

Control unit is­sues a heat de­mand

no

Increase set value
and ensure heat is
drawn off

yes

Fan starts

no

After approx. 51 s
fault F9

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

38

yes

Ignition

no

Fault EE

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

yes

Gas train opens

no

Fault EE

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

yes

Ionisation current
builds
Symbol

A

no

Fault EE

Check the ionisa­tion electrode ad­justment and the
gas line for air­locks

yes

Burner in opera­tion

no

Stops below the
set boiler water
temperature and
restarts immedi­ately

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

39

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 117.

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 supply line thoroughly after
flushing.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

40

A

1. Close the gas shut-off valve.

2.

Undo screw A inside test nipple
"PE" on the gas train, but do not
remove it, and connect the pressure
gauge.

3. Open the gas shut-off valve.

4. Check the static pressure and record

the value in the report on page 173.

Set value: max. 57.5 mbar.

5. Start the boiler.

Note

During commissioning, the boiler can
enter a fault state because of airlocks
in the gas line. After approx. 5 s,
press R to reset the burner.

6. Check the supply (flow) pressure. Set
values:

■ Natural gas 20 mbar

■ LPG 50 mbar

Note

Use a suitable measuring device with
a resolution of at least 0.1 mbar to
measure the supply pressure.

7. Record the actual value in the service
report.
Take the action shown in the follow­ing table.

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

41

9. Danger

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

Open the gas shut-off valve, start the
boiler and check for tightness at test
nipple A.

Supply (flow) pres­sure for natural
gas

Supply (flow)
pressure for LPG

Action

below 15 mbar below 42.5 mbar Do not start the boiler. Notify your gas

supply utility or LPG supplier.
15 to 25 mbar 42.5 to 57.5 mbar Start the boiler.
above 25 mbar above 57.5 mbar Install a separate gas pressure governor

upstream of the system and regulate the

pre-charge pressure to 20 mbar for natu-

ral gas or 50 mbar for LPG. Notify your

gas supply utility or LPG supplier.

Maximum output setting

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.

Weather-compensated control unit:

1. Press OK and å simultaneously

for approx. 4 s.

2. "Service functions"

3. "Max. output"

4. "Change?" Select "Yes".

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

5. Set the required value.

Constant temperature control unit:

1. Press OK and å simultaneously

for approx. 4 s.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

42

2.

Select "3" with Ú and confirm with
OK.
A value flashes on the display (e.g.
"85") and "A" appears. In the deliv­ered condition, this value represents
100 % of rated heating output.

3. Select required value and confirm
with OK.

Checking the balanced flue system for tightness (annular gap
check)

A

A

Combustion air aperture

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.)

5623 520 GB

43

Removing the burner and checking the burner gasket

A

B

C

D

E

F

G

H

K

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

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

3.

Unlock control unit A and pivot for­wards.

4.

Remove cover panel B.

5.

Pull cables from fan motor C, gas
train D, ignition unit E and ionisa­tion electrode F.

6.

Undo gas supply pipe fitting G.

7.

Undo six screws H and remove the
burner.

!

Please note

To prevent damage,
never touch the mesh of the
burner gauze assembly.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

44

8.

Check burner gasket K for damage.
Replace gasket if required.

Checking the burner gauze assembly & replacing if required

C

B

6x

E

F

D

4x

A

1.

Remove electrodes A.

2.

Undo six retaining clips B on ther­mal insulation ring C and then
remove thermal insulation ring C.

3.

Undo four Torx screws D and
remove burner gauze assembly

E

with burner gauze assembly gasket

F

.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

45

4. Insert new burner gauze assembly

E

with new gasket F and secure
with four Torx screws.
Torque: 4.0 Nm

5.

Refit thermal insulation ring C and
electrodes A.

Checking the flue gas non-return device

B

A

1. Undo three screws and remove fan

A

.

2. Remove flue gas non-return device

B

.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

46

3. Check the damper and gasket for dirt

and damage. Replace as neces­sary.

4.

Refit flue gas non-return device B.

5.

Refit fan A and secure with three
screws.
Torque: 3.0 Nm.

Checking and adjusting the ignition and ionisation electrodes

14

±1

6

+2

0

4

+0,5

0

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.

!

Please note

Do not damage the mesh of
the
burner gauze assembly.

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 3 Nm.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

47

Cleaning the combustion chamber/heat exchanger and installing
the burner

A

1.

!

Please note

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

Never use brushes to clean
the heating surface.

Use a vacuum cleaner to remove res­idues from heat exchanger A in the
combustion chamber.

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

3.

Thoroughly flush heat exchanger A
with water.

4. Install the burner and torque the
screws diagonally with 8.5 Nm.

5. Fit the gas supply pipe with a new
gasket. Torque fittings with 15 Nm.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

48

6. Check the gas connections for tight-

ness.

Danger

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

7. Connect the electrical cables/leads to
the corresponding components.

Checking the condensate drain and cleaning the siphon

Note

If condensate escapes at vent aperture

A

or B, clean or (if necessary) replace

the following drain line.

E

F

C

D

A

B

1.

Pull off cap C downwards.

2.

Undo hose D.

3.

Undo union nut E and pull siphon
F

downwards.

4.

Clean siphon F.

5. Check that the condensate can drain
freely to the public sewage system.

6.

Fill siphon F with water and reas­semble.

7.

Refit hose D.

8.

Push on cap C from below.

Checking the diaphragm expansion vessel and system pressure

Note

Carry out this test on a cold system.

1. Drain the system or close the cap
valve on the diaphragm expansion
vessel and reduce the pressure until
the pressure gauge indicates "0".

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

49

2. If the pre-charge pressure of the dia-

phragm expansion vessel is lower
than the static system pressure, top
up with nitrogen until the pre-charge
pressure is raised by 0.1 to 0.2 bar.

3. Top up with water until the charge
pressure of the cooled system is 0.1
to 0.2 bar higher than the pre-charge
pressure of the diaphragm expansion
vessel.
Permiss. operating pressure: 6 bar.

Checking all gas equipment for tightness at operating pressure

Danger

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

Note

Only use suitable and approved leak
detecting 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.

Checking 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 plus the CO2 or O

2

content. For a description of the elec­tronic combustion controller functions,
see page 160.

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 (upper and lower out-

put):
– 7.5 to 9.6 % for natural gas E and LL
– 9.0 to 11.3 % for LPG P

■ For all gas types, the O2 content must
be between 3.8 and 7.3 %.

If the actual CO2 or O2 values lie outside
their respective ranges, check the bal-

anced flue system for tightness, see
page 42.

Note

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

50

A

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 50).

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

mentioned ranges by more than 1 %,
implement steps from page 49.

5. Enter actual values into the report.

6. Select the upper output (see

page 50).

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

mentioned ranges by more than 1 %,
implement steps from page 49.

8. After testing, press OK.

9. Enter actual values into the report.

Select higher/lower heating output

Weather-compensated control unit Constant temperature control unit

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.

Service menu

1. Press OK and å simultaneously for

approx. 4 s.

2. Select " " with Ú and confirm with

OK.
The display shows "I" and "ON" flash­es.

3. Select the lower heating output:
Press OK, "ON" will be displayed con-
stantly.

4. Select the upper heating output:
Press ä.

5. Select "2" with Ú, "ON" flashes.

6. Press OK, "ON" will be displayed con­stantly.

7. Ending output selection:
Press ä.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

51

Matching the control unit to the heating system

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

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

■ For coding steps, see page 66.

System version 1

One heating circuit without mixer A1, with/without DHW heating, with low loss
header

1

2

34

6

5

9

qP

8

7

ID: 4605139_1103_02

1

Vitodens 200-W

2

Outside temperature sensor (only
for weather-compensated control
units)
or
Vitotrol 100 (only for constant tem­perature control units)

3

Boiler circuit pump

4

Circulation pump for cylinder heat­ing

5

DHW cylinder

6

Cylinder temperature sensor

7

Heating circuit without mixer A1
(heating circuit 1)

8

Heating circuit pump A1

9

Low loss header

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

52

qP

Flow temperature sensor, low loss
header

Function/system components Code

Adjust Group

Operation with LPG 82:1 "General"/1
System with low loss header and without DHW circu­lation pump:
Heating circuit pump A1 connection at internal exten­sion H1 or H2

53:2 "General"/1

System with low loss header and with DHW circula­tion pump:
Heating circuit pump A1 connection at extension
AM1, terminal A1

— "General"/1

DHW circulation pump connection at internal exten­sion H1 or H2

— "General"/1

System with low loss header 04:0 "Boiler"/1

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

53

System version 2

One heating circuit with mixer M2, with/without DHW heating, with low loss
header

1

2

4

qW

qE

3

M

7

8

qP

qQ

9

6

5

ID: 4605140_1103_02

1

Vitodens 200-W

2

Outside temperature sensor

3

Boiler circuit pump

4

Circulation pump for cylinder heat­ing

5

DHW cylinder

6

Cylinder temperature sensor

7

Heating circuit with mixer M2 (heat­ing circuit 2)

8

Temperature limiter to restrict the
maximum temperature of underfloor
heating systems

9

Flow temperature sensor M2

qP

Heating circuit pump M2

qQ

Extension kit for one heating circuit
with mixer M2

qW

Low loss header

qE

Flow temperature sensor, low loss
header

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

54

Function/system components Code

Adjust Group

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

■ with DHW cylinder 00:4 "General"

■ without DHW cylinder 00:3 "General"
System with DHW circulation pump
DHW circulation pump connection at internal exten­sion H1 or H2

— "General"

System with low loss header 04:0 "Boiler"

System version 3

One heating circuit with mixer M2, with system separation, with/without DHW
heating

1

6

5

2

4

M

7

8

qP

qQ

qP

qW

9

3

ID: 4605141_1103_02

1

Vitodens 200-W

2

Outside temperature sensor

3

Boiler circuit pump

4

Circulation pump for cylinder heat­ing

5

DHW cylinder

6

Cylinder temperature sensor

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

55

7

Heating circuit with mixer M2 (heat­ing circuit 2)

8

Temperature limiter to restrict the
maximum temperature of underfloor
heating systems

9

Flow temperature sensor M2

qP

Heating circuit pump M2

qQ

Heat exchanger for system separa­tion

qW

Extension kit for one heating circuit
with mixer M2

Function/system components Code

Adjust Group

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

■ with DHW cylinder 00:4 "General"

■ without DHW cylinder 00:3 "General"
System with DHW circulation pump
DHW circulation pump connection at internal exten­sion H1 or H2

— "General"

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

56

System version 4

One heating circuit without mixer, 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)

1

6

5

M

qI

qO

8

7

qE

qZ

qU

2

34

qT

M

qW

qQ

qP

9

qR

ID: 4605142_1103_02

1

Vitodens 200-W

2

Outside temperature sensor

3

Boiler circuit pump

4

Circulation pump for cylinder heat­ing

5

DHW cylinder

6

Cylinder temperature sensor

7

Heating circuit without mixer A1
(heating circuit 1)

8

Heating circuit pump A1

9

Heating circuit with mixer M2 (heat­ing circuit 2)

qP

Flow temperature sensor M2

qQ

Heating circuit pump M2

qW

Extension kit for one heating circuit
with mixer M2

qE

Heating circuit with mixer M3 (heat­ing circuit 3)

qR

Temperature limiter to restrict the
maximum temperature of underfloor
heating systems

qT

Flow temperature sensor M3

qZ

Heating circuit pump M3

qU

Extension kit for one heating circuit
with mixer M3

qI

Low loss header

qO

Flow temperature sensor, low loss
header

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

57

Function/system components Code

Adjust Group

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

■ with DHW cylinder 00:8 "General"

■ without DHW cylinder 00:7 "General"
System without DHW circulation pump
Heating circuit pump A1 connection at internal exten­sion H1 or H2

53:2 "General"

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

— "General"

DHW circulation pump connection at extension AM1,
terminal A2

— "General"

System with low loss header 04:0 "Boiler"

System version 5

Multi boiler system with several heating circuits with mixer and low loss header
(with/without DHW heating)

1

4

6

5

M M

1

4

7

qU

qI

qQ

qP

9

8

32 qW

qE
qR

qT

qZ

ID: 4605016_1103_04

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

58

1

Vitodens 200-W

2

Vitotronic 300-K

3

Outside temperature sensor

4

Boiler circuit pump

5

DHW cylinder

6

Cylinder temperature sensor

7

Circulation pump for cylinder heat­ing

8

Heating circuit with mixer M2 (heat­ing circuit 2)

9

Flow temperature sensor M2

qP

Heating circuit pump M2

qQ

Extension kit for one heating circuit
with mixer M2

qW

Heating circuit with mixer M3 (heat­ing circuit 3)

qE

Temperature limiter to restrict the
maximum temperature of underfloor
heating systems

qR

Flow temperature sensor M3

qT

Heating circuit pump M3

qZ

Extension kit for one heating circuit
with mixer M3

qU

Low loss header

qI

Flow temperature sensor, low loss
header

Required codes Address

Multi boiler system with Vitotronic 300-K 01:2

Note

Codes for multi boiler system, see
Vitotronic 300-K installation and service
instructions

Adjusting the heating curves (only for weather-compensated
control units)

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

Settings in the delivered condition:

■ Slope = 1.4

■ Level = 0

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.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

59

0.2

Outside temperature in °C

Boiler water or

Flow temperature in °C

Slope

2.4

2.6

2.8

3.0

3.2

3.4

90

80

70

60

50

40

30

0 -5 -10 -15 -20510

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. When the
heating circuit pump logic function has
been enabled, the curve modifies the
starting and stopping characteristics of
the heating circuit pump.

Standard set room temperature

90

-20

26 + 20

A

C

D

E

B

Example 1: Change in 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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

60

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: Change in 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.

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.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

61

Connecting the control unit to the LON

The LON communication module must
be plugged in.

Note

The data transfer via the LON can take
several minutes.

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

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

Note

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

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

LON LON LON

Subscriber no. 1
Code "77:1"

Subscriber no. 10
Code "77:10"

Subscriber no. 11
Set code "77:11"

Subscriber no.

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

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

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

Device is fault

manager

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

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

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

Device 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"

—

LON subscriber fault
monitoring
Code "9C:20"

LON subscriber fault
monitoring
Code "9C:20"

LON subscriber fault
monitoring
Code "9C:20"

—

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

62

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")

■ The LON subscriber number must be
programmed in all control units (see
page 61)

■ The LON subscriber list in the fault
manager must be up to date (see
page 61)

Carry out subscriber check:

1. Press OK and å simultaneously

for approx. 4 s.

2. "Service functions"

3. "Subscriber check"

4. Select subscriber (e.g. subscriber

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

■ Successfully tested subscribers
are designated with "OK".

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

Note

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

Note

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

Calling up and resetting the "Service" display

The red fault indicator flashes when the
limits set in coding address "21" and
"23" in group "Boiler" have been
reached.

The following appears on the program­ming unit display:

■ On a constant temperature control
unit:
The specified hours run or the speci­fied interval with calendar symbol
"ý" (subject to setting) and "¸"

■ On a weather-compensated control
unit:
"Service" and "¸"

Acknowledging and resetting service

Press OK to acknowledge a service
message.

Note

An acknowledged service message that
was not reset reappears:

■ On a weather-compensated control
unit, on the following Monday.

■ On a constant temperature control
unit, after seven days.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

63

After a service has been carried out
(resetting service)

Weather-compensated control unit

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.

Constant temperature control unit

Reset code 24:1 in group "2" to 24:0.

Note

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

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

64

Fitting the front panel

2x

1.

2.

Note

Ensure the locking screws are fitted
before operating.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

65

Instructing the system user

The system installer should hand the
operating instructions to the system user
and instruct the user in operating the
system.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5623 520 GB

Service

66

Calling up coding level 1

Note

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

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

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

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

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

Weather-compensated control unit:

1. Press OK and å simultaneously

for approx. 4 s.

2. "Coding level 1"

3. Select group of required coding

address:

■ "General"

■ "Boiler"

■ "DHW"

■ "Solar"

■ "Heating circuit 1/2/3"

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

Constant temperature control unit:

1. Press OK and å simultaneously

for approx. 4 s.

2.

Select "1" with Ú for coding level 1
and confirm with OK.
"I" flashes on the display for the cod­ing addresses in group 1.

3. Select the group for the required cod­ing address with V/v:

1: "General"
2: "Boiler"
3: "DHW"
4: "Solar"
5: "Heating circuit 1"
6: "All codes std device"

In this group, all coding addresses
are displayed in ascending order.

Confirm selected category with OK.

4. Select coding address with V/v.

Code 1

Calling up coding level 1

5623 520 GB

67

5. Set value according to the following

tables with V/v and confirm with

OK.

6. If you want to reset all codes to
their delivered condition:
Select "7" with Ú and confirm with
OK.
When " " flashes, confirm with OK.

Note

This also resets codes at coding level

2.

General/group "1"

Select "General" for weather-compensated control units (see page 66).
Select "1" for constant temperature control units (see page 66).

Coding

Coding in the delivered condition Possible change
System design

00:1 System version 1:

One heating circuit with­out mixer A1 (heating cir­cuit 1), without DHW
heating

00:2
to
00:10

For system schemes, see
the following table:

Value
address
00: ...

System
version

Description

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

DHW heating (code is adjusted automatically)

3 2.3 One heating circuit with mixer M2 (heating circuit 2), without

DHW heating

4 2.3 One heating circuit with mixer (heating circuit 2), with DHW

heating

5 4 One heating circuit without mixer A1 (heating circuit 1) and

one heating circuit with mixer M2 (heating circuit 2), without
DHW heating (code is adjusted automatically)

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

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

Code 1

Calling up coding level 1

(cont.)

5623 520 GB

Service

68

Value
address
00: ...

System
version

Description

7 4 One heating circuit with mixer M2 (heating circuit 2) and one

heating circuit with mixer M3 (heating circuit 3), without DHW
heating

8 4 One heating circuit with mixer M2 (heating circuit 2) and one

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

9 4 One heating circuit without mixer A1 (heating circuit 1), one

heating circuit with mixer M2 (heating circuit 2) and one heat­ing circuit with mixer M3 (heating circuit 3), without DHW
heating (code is adjusted automatically)

10 4 One heating circuit without mixer A1 (heating circuit 1), one

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

Coding in the delivered condition Possible change
Internal circulation pump function

51:0 System with low loss

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

51:1 System with low loss 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 when run-on time ex­pires.

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 when run-on time ex­pires.

Code 1

General/group "1"

(cont.)

5623 520 GB

69

Coding in the delivered condition Possible change
Subscriber no.

77:1 LON subscriber number

(only for weather-com­pensated control units)

77:2
to
77:99

LON subscriber number,
adjustable from 1 to 99:
1 - 4 = Boiler
5 = Cascade
10 - 97 = Vitotronic 200-H
98 = Vitogate
99 = Vitocom

Note

Allocate each number only
once.

Detached house/apartment building

7F:1 Detached house (only for

weather-compensated
control units)

7F:0 Apartment building

Separate adjustment of
holiday program and time
program for DHW heating
possible.

Lock out controls

8F:0 Operation in the standard

menu and extended
menu enabled.

Note

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

8F:1 Operation in standard

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

8F:2 Operation enabled in the

standard menu and
blocked in the 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 flow temperature for
external demand adjusta­ble from 0 to 127 °C (limited
by boiler-specific parame­ters)

Code 1

General/group "1"

(cont.)

5623 520 GB

Service

70

Select "Boiler" for weather-compensated control units (see page 66).
Select "2" for constant temperature control units (see page 66).

Coding

Coding in the delivered condition Possible change
Single/multi boiler system

01:1 Single boiler system (only

for constant temperature
control units)

01:2 Multi boiler system with

Vitotronic 300-K

Boiler number

07:1 Boiler number in multi

boiler systems (only for
constant temperature
control units)

07:2
to
07:8

Boiler number 2 to 8 in mul­ti boiler systems

Burner service in 100 hours

21:0 No service interval (hours

run) selected

21:1
to
21:100

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

≙

100 h

Service interval in months

23:0 No time interval for burn-

er service

23:1
to
23:24

Interval adjustable from 1
to 24 months

Service status

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

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

Filling/Venting

2F:0 Venting program/fill pro-

gram disabled

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

DHW/group "3"

Select "DHW" for weather-compensated control units (see page 66).
Select "3" for constant temperature control units (see page 66).

Code 1

Boiler/group "2"

5623 520 GB

71

Coding

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

67:40 For solar DHW heating:

Set DHW temperature
40 °C. Reheating is sup­pressed above the selec­ted set temperature (boil­er is only connected as
backup if the rise in cylin­der temperature is too
low).
Cannot be adjusted on
gas condensing combi
boilers.

67:0
to
67:95

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

Enable DHW circulation pump

73:0 DHW circulation pump:

"ON" in accordance with
the time program (only for
weather-compensated
control units)

73:1
to
73:6

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

73:7 Constantly "ON"

Solar/group "4"

Select "Solar" for weather-compensated control units (see page 66).
Select "4" for constant temperature control units (see page 66).

Note

The solar group is only displayed if a solar control module, type SM1, is connected.

Code 1

DHW/group "3"

(cont.)

5623 520 GB

Service

72

Coding

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

02:0 Solar circuit pump is not

speed-controlled.

02:1 Solar circuit pump is

speed-controlled with
wave packet control.

02:2 Solar circuit pump is

speed-controlled with
PWM control.

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

disabled.
0A:1
to
0A:40

Temperature differential

adjustable from 1 to 40 K.

Flow rate solar circuit

0F:70 Solar circuit flow rate at

the maximum pump
speed 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.

Code 1

Solar/group "4"

(cont.)

5623 520 GB

73

Coding in the delivered condition Possible change
Extended solar control functions

20:0 No extended control func-

tion enabled.

20:1 Additional function for

DHW heating.

20:2 Differential temperature

control 2.

20:3 Differential temperature

control 2 and auxiliary func­tion.

20:4 Differential temperature

control 2 for central heating

backup.
20:5 Thermostat function.
20:6 Thermostat function and

auxiliary function.
20:7 Solar heating via external

heat exchanger without ad-

ditional temperature sen-

sor.
20:8 Solar heating via external

heat exchanger with addi-

tional temperature sensor.
20:9 Solar heating of two DHW

cylinders.

Heating circuit 1, heating circuit 2, heating circuit 3/group "5"

Select "Heating circuit ..." for weather-compensated control units (see page 66).
Select "5" for constant temperature control units (see page 66).

Code 1

Solar/group "4"

(cont.)

5623 520 GB

Service

74

Coding

Coding in the delivered condition Possible change
Priority DHW heating

A2:2 Cylinder priority applica-

ble to heating circuit
pump and mixer

A2:0 Without cylinder priority ap-

plied to heating circuit
pump and mixer

A2:1 Cylinder priority only appli-

cable to mixer
A2:3
to
A2:15

Reduced priority applied to

mixer (the heating circuit

receives a reduced amount

of energy)

Economy function outside temperature

A5:5 With heating circuit pump

logic function (economy
mode): 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 (only for

weather-compensated
control units)

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

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5623 520 GB

75

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

A6:36 Extended economy func-

tion disabled (only for
weather-compensated
control units)

A6:5
to
A6:35

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

Extended economy function mixer

A7:0 Without mixer economy

function (only for a weath­er-compensated control
unit and heating circuit
with mixer)

A7:1 With mixer economy func-

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

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

Heating circuit pump
"ON":

■ If the mixer changes to
control function

■ If there is a risk of frost

Pump idle time, transition reduced mode

A9:7 With pump idle time:

Heating circuit pump
"OFF" if the set value is
altered through a change
in operating mode or
through a change in the
set room temperature
(only for weather-com­pensated control units)

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

With pump idle time, ad­justable from 1 to 15. The
higher the value, the longer
the pump idle time.

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5623 520 GB

Service

76

Coding in the delivered condition Possible change
Weather-compensated/room temperature hook-up

b0:0 With remote control:

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

b0:1 Heating mode: weather-

compensated
Reduced mode: with room
temperature hook-up

b0:2 Heating mode: with room

temperature hook-up
Reduced mode: weather­compensated

b0:3 Heating mode/reduced

mode: with room tempera­ture hook-up

Economy function room temperature

b5:0 With remote control: No

room temperature-de­pendent heating circuit
pump logic function (only
for weather-compensa­ted control units; only
change the code for the
heating circuit with mix­er)

b5:1
to
b5:8

Heating circuit pump logic
function, see the following
table:

Parameter ad­dress b5:...

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

1 RT

actual

> RT

set

+ 5 K RT

actual

< RT

set

+ 4 K

2 RT

actual

> RT

set

+ 4 K RT

actual

< RT

set

+ 3 K

3 RT

actual

> RT

set

+ 3 K RT

actual

< RT

set

+ 2 K

4 RT

actual

> RT

set

+ 2 K RT

actual

< RT

set

+ 1 K

5 RT

actual

> RT

set

+ 1 K RT

actual

< RT

set

6 RT

actual

> RT

set

RT

actual

< RT

set

- 1 K

7 RT

actual

> RT

set

- 1 K RT

actual

< RT

set

- 2 K

8 RT

actual

> RT

set

- 2 K RT

actual

< RT

set

- 3 K

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

C5:20 Electronic minimum flow

temperature limit 20 °C
(only for weather-com­pensated control units)

C5:1
to
C5:127

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

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5623 520 GB

77

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

C6:74 Electronic maximum flow

temperature limit 74 °C
(only for weather-com­pensated control units)

C6:10
to
C6:127

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

Heating program - changeover

d5:0 The external heating pro-

gram changeover
changes the heating pro­gram to "Constant opera­tion with reduced room
temperature" or "Standby
mode" (only for weather­compensated control
units)

d5:1 The external heating pro-

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

Ext. heating program changeover to heating circuit

d8:0 No heating program

changeover via extension
EA1

d8:1 Heating program change-

over via input DE1 at ex­tension EA1

d8:2 Heating program change-

over via input DE2 at ex­tension EA1

d8:3 Heating program change-

over via input DE3 at ex­tension EA1

Screed drying

F1:0 Screed drying function

disabled (only for weath­er-compensated control
units).

F1:1
to
F1:6

Screed drying adjustable in
accordance with 6 selecta­ble temperature/time pro­files (see page 154)

F1:15 Constant flow temperature

20 °C

Party mode time limit

F2:8 Time limit for party mode

or external heating pro­gram changeover via
pushbutton: 8 h (only for
weather-compensated
control units)

*1

F2:0 No time limit for party

mode

*1

F2:1
to
F2:12

Time limit adjustable from 1
to 12 h

*1

*1

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

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5623 520 GB

Service

78

Coding in the delivered condition Possible change
Pump control in only DHW mode

F6:25 In the "Only DHW" oper-

ating mode, the circula­tion pump in the heating
circuit connection set is
permanently on (only for
constant temperature
control units)

F6:0 In the "Only DHW" operat-

ing mode, the circulation
pump in the heating circuit
connection set is perma-

nently off
F6:1
to
F6:24

In the "Only DHW" operat-

ing mode, the circulation

pump in the heating circuit

connection set will be star-

ted 1 to 24 times per day for

10 min each time.

Pump control in standby mode

F7:25 In the "Standby" operat-

ing mode, the circulation
pump in the heating cir­cuit connection set is per­manently on (only for
constant temperature
control units)

F7:0 In the "Standby" operating

mode, the circulation pump

in the heating circuit con-

nection set is permanently

off
F7:1
to
F7:24

In the "Standby" operating

mode, the circulation pump

in the heating circuit con-

nection set will be started 1

to 24 times per day for

10 min each time.

Start temperature raising

F8:-5 Temperature limit for ter-

minating the reduced
mode -5 ºC; see example
on page 157.
Observe the setting of
coding address "A3". (on­ly for weather-compensa­ted control units)

F8:+10
to
F8:-60

Temperature limit adjusta-

ble from

+10 to -60 °C
F8:-61 Function disabled

End temperature raising

F9:-14 Temperature limit for rais-

ing the reduced set room
temperature -14 ºC; see
example on page 157.
(only for weather-com­pensated control units)

F9:+10
to
F9:-60

Temperature limit for rais-

ing the set room tempera-

ture to the value selected

for standard mode adjusta-

ble from

+10 to -60 °C

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5623 520 GB

79

Coding in the delivered condition Possible change
Set flow temperature increase

FA:20 Raising the set boiler wa-

ter temperature or the set
flow temperature when
changing from operation
with reduced room tem­perature to operation with
standard room tempera­ture, by 20 %. See exam­ple on page 158 (only for
weather-compensated
control units).

FA:0
to
FA:50

Temperature rise adjusta­ble from 0 to 50 %

Duration set flow temperature increase

Fb:30 Duration for raising the

set boiler water tempera­ture or the set flow tem­perature (see coding ad­dress "FA") 60 min. See
example on page 158
(only for weather-com­pensated control units).

Fb:0
to
Fb:150

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

Code 1

Heating circuit 1, heating circuit 2, heating…

(cont.)

5623 520 GB

Service

80

Calling up coding level 2

Note

■ At coding level 2, all codes are acces­sible, including the codes at coding
level 1.

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

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

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

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

Weather-compensated control unit:

1. Press OK and å simultaneously

for approx. 4 s.

2. Press OK and ä simultaneously for

approx. 4 s.

3. "Coding level 2"

4. Select group of required coding

address:

■ "General"

■ "Boiler"

■ "DHW"

■ "Solar"

■ "Heating circuit 1/2/3"

■ "All codes std device"
In this group, all coding addresses
(except the coding addresses from
the "Solar" group) are displayed in
ascending order.

5. Select coding address.

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

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

Note

This also resets codes at coding level

1.

Constant temperature control unit:

1. Press OK and å simultaneously

for approx. 4 s.

2. Press OK and ä simultaneously for
approx. 4 s.

3.

Select "2" with Ú for coding level 2
and confirm with OK.
"I" flashes on the display for the cod­ing addresses in category 1.

Code 2

Calling up coding level 2

5623 520 GB

81

4. Select the group for the required cod-

ing address with V/v:

1: "General"
2: "Boiler"
3: "DHW"
4: "Solar"
5: "Heating circuit 1"
6: "All codes std device"

In this group, all coding addresses
are displayed in ascending order.

Confirm selected category with OK.

5. Select coding address with V/v.

6. Set value according to the following

tables with V/v and confirm with

OK.

7. If you want to reset all codes to
their delivered condition:
Select "7" with Ú and confirm with
OK.
When " " flashes, confirm with OK.

Note

This also resets codes at coding level

1.

General/group "1"

Select "General" for weather-compensated control units (see page 80).
Select "1" for constant temperature control units (see page 80).

Coding

Coding in the delivered condition Possible change

00:1 System version 1:

One heating circuit with­out mixer A1 (heating cir­cuit 1), without DHW
heating

00:2
to
00:10

For system schemes, see
the following table:

Value
address
00: ...

System
version

Description

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

DHW heating (code is adjusted automatically)

3 2.3 One heating circuit with mixer M2 (heating circuit 2), without

DHW heating

4 2.3 One heating circuit with mixer (heating circuit 2), with DHW

heating

5 4 One heating circuit without mixer A1 (heating circuit 1) and

one heating circuit with mixer M2 (heating circuit 2), without
DHW heating (code is adjusted automatically)

Code 2

Calling up coding level 2

(cont.)

5623 520 GB

Service

82

Value
address
00: ...

System
version

Description

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

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

7 4 One heating circuit with mixer M2 (heating circuit 2) and one

heating circuit with mixer M3 (heating circuit 3), without DHW
heating

8 4 One heating circuit with mixer M2 (heating circuit 2) and one

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

9 4 One heating circuit without mixer A1 (heating circuit 1), one

heating circuit with mixer M2 (heating circuit 2) and one heat­ing circuit with mixer M3 (heating circuit 3), without DHW
heating (code is adjusted automatically)

10 4 One heating circuit without mixer A1 (heating circuit 1), one

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

Coding in the delivered condition Possible change

11:≠9

No access to the coding
addresses for the com­bustion controller param­eters

11:9 Access open to the coding

addresses for the combus­tion controller parameters

25:0 Without outside tempera-

ture sensor (for constant
temperature control
units)

25:1 With outside temperature

sensor (automatic recogni­tion)

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:1 With flow sensors (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 Function output A1: DHW

circulation pump

Code 2

General/group "1"

(cont.)

5623 520 GB

83

Coding in the delivered condition Possible change

33:2 Function output A1: Circu-

lation pump for cylinder
heating

34:0 Function output A2 at ex-

tension AM1: DHW circu­lation pump

34:1 Function output A2: Heat-

ing circuit pump

34:2 Function output A2: Circu-

lation pump for cylinder
heating

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

matic recognition)

36:0

Function, output aBJ at
extension EA1: Fault
message

36:1

Function output aBJ: Feed
pump

36:2

Function output aBJ: DHW
circulation pump

39:2

Function output sA: Cir­culation pump for cylinder
heating

39:0

Function output sA: DHW
circulation pump

39:1

Function output sA: Heat­ing circuit pump

3A:0 Function input DE1 at ex-

tension EA1: Not as­signed

3A:1 Function input DE1: Heat-

ing program - changeover

3A:2 Function input DE1: Exter-

nal demand with set flow
temperature.
Flow temperature setting:
Coding address 9b.
Internal circulation pump
function: Coding address
3F

3A:3 Function input DE1: Exter-

nal blocking.
Internal circulation pump
function: Coding address
3E

3A:4 Function input DE1: Exter-

nal blocking with fault mes­sage input
Internal circulation pump
function: Coding address
3E

3A:5 Function input DE1: Fault

message input

Code 2

General/group "1"

(cont.)

5623 520 GB

Service

84

Coding in the delivered condition Possible change

3A:6 Function input DE1: Brief

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

3b:0 Function input DE2 at ex-

tension EA1: Not as­signed

3b:1 Function input DE2: Heat-

ing program - changeover

3b:2 Function input DE2: Exter-

nal demand with set flow
temperature.
Flow temperature setting:
Coding address 9b.
Internal circulation pump
function: Coding address
3F

3b:3 Function input DE2: Exter-

nal blocking.
Internal circulation pump
function: Coding address
3E

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: Not as­signed

3C:1 Function input DE3: Heat-

ing program - changeover

Code 2

General/group "1"

(cont.)

5623 520 GB

85

Coding in the delivered condition Possible change

3C:2 Function input DE3: Exter-

nal demand with set flow
temperature.
Flow temperature setting:
Coding address 9b.
Internal circulation pump
function: Coding address
3F

3C:3 Function input DE3: Exter-

nal blocking.
Internal circulation pump
function: Coding address
3E

3C:4 Function input DE3: Exter-

nal blocking with fault mes­sage input
Internal circulation pump
function: Coding address
3E

3C:5 Function input DE3: Fault

message input

3C:6 Function input DE3: Brief

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

3d:5 DHW circulation pump

runtime for brief opera­tion: 5 min

3d:1
to
3d:60

DHW circulation pump run­time adjustable from 1 to
60 min

3E:0 Boiler circuit pump stays

in control mode on "Ex­ternal blocking" signal

3E:1 Boiler circuit pump is stop-

ped on "External blocking"
signal

3E:2 Boiler circuit pump is star-

ted on "External blocking"
signal

3F:0 Boiler circuit pump stays

in control mode on "Ex­ternal demand" signal

3F:1 Boiler circuit pump is stop-

ped on "External demand"
signal

Code 2

General/group "1"

(cont.)

5623 520 GB

Service

86

Coding in the delivered condition Possible change

3F:2 Boiler circuit pump is star-

ted on "External demand"
signal

4b:0

Function input lH: Room
thermostat (Vitotrol 100)
for constant temperature
control

4b:1 External demand
4b:2 External blocking

51:0 System with low loss

header:
Boiler circuit pump is al­ways started when there
is a heat demand

51:1 System with low loss head-

er:
When there is heat de­mand, the boiler circuit
pump will only be started if
the burner is running.
Circulation pump is switch­ed off when run-on time ex­pires.

51:2 System with heating water

buffer cylinder:
When there is heat de­mand, the boiler circuit
pump will only be started if
the burner is running.
Circulation pump is switch­ed off when run-on time ex­pires.

52:0 Without flow temperature

sensor for low loss head­er

52:1 With flow temperature sen-

sor for low loss header (au­tomatic recognition)

53:1

Function connection sK
of the internal extension:
DHW circulation pump

53:0

Function connection sK:
Central fault message

53:2

Function connection sK:
External heating circuit
pump (heating circuit 1)

53:3

Function connection sK:
External circulation pump
for cylinder heating

54:0 Without solar thermal

system

54:1 With Vitosolic 100 (auto-

matic recognition)

54:2 With Vitosolic 200 (auto-

matic recognition)

Code 2

General/group "1"

(cont.)

5623 520 GB

87

Coding in the delivered condition Possible change

54:3 With solar control module

SM1 without auxiliary func­tion (automatic recogni­tion)

54:4 With solar control module

SM1 with auxiliary function,
e.g. central heating backup
(automatic recognition)

6E:50 No correction of meas-

ured outside tempera­ture

6E:0
to
6E:100

Outside temperature cor­rection in 0.1 K steps
0 to 49 = -5 K to -0.1 K
51 to 100 = 0.1 K to 5 K

76:0 Without communication

module

76:1 With LON communication

module (recognised auto­matically; only for weather­compensated control
units)

76:2 With cascade communica-

tion module (recognised
automatically; only for con­stant temperature control
units)

77:1 LON subscriber number

(only for weather-com­pensated control units)

77:2
to
77:99

LON subscriber number,
adjustable from 1 to 99:
1 - 4 = Boiler
5 = Cascade
10 - 97 = Vitotronic 200-H
98 = Vitogate
99 = Vitocom

Note

Allocate each number only
once.

79:1 With LON communication

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

79:0 Control unit is not fault

manager

Code 2

General/group "1"

(cont.)

5623 520 GB

Service

88

Coding in the delivered condition Possible change

7b:1 With LON communication

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

7b:0 Does not transmit time

7F:1 Detached house (only for

weather-compensated
control units)

7F:0 Apartment building

Separate adjustment of
holiday program and time
program for DHW heating
possible.

80:6 If a fault occurs for at least

30 s, a fault message is
displayed

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

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

81:1 Automatic summer/win-

tertime changeover

81:0 Manual summer/winter-

time changeover

81:2 Use of the radio clock re-

ceiver (automatic recogni­tion)

81:3 With LON communication

module: The control unit re­ceives the time

82:0 Operation with natural

gas

82:1 Operation with LPG (only

adjustable if coding ad­dress 11:9 has been set)

88:0 Temperature display in

°C (Celsius)

88:1 Temperature display in °F

(Fahrenheit)
8A:175 Do not adjust.
8F:0 Operation in the standard

menu and extended
menu enabled.

Note

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

8F:1 Operation in the standard

menu and extended menu

blocked.

Emissions test mode can

be enabled.

8F:2 Operation enabled in the

standard menu; blocked in

the extended menu.

Emissions test mode can

be enabled.

Code 2

General/group "1"

(cont.)

5623 520 GB

89

Coding in the delivered condition Possible change

90:128 Time constant for calcu-

lating the adjusted out­side temperature 21.3 h

90:1
to
90:199

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

94:0 Without Open Therm ex-

tension

94:1 With Open Therm exten-

sion (automatic recogni­tion)

95:0 Without Vitocom 100

communication interface

95:1 With Vitocom 100 commu-

nication interface (auto­matic recognition)

97:0 With LON communication

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

97:1 Control unit receives out-

side temperature

97:2 Control unit transmits the

outside temperature to the
Vitotronic 200-H

98:1 Viessmann system num-

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

98:1
to
98:5

System number adjustable
from 1 to 5

99:0 Do not adjust
9A:0 Do not adjust
9b:70 Set flow temperature for

external demand 70 °C

9b:0
to
9b:127

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

9C:20 Monitoring LON subscrib-

ers.

9C:0 No monitoring
9C:5
to

Time adjustable from 5 to
60 min

Code 2

General/group "1"

(cont.)

5623 520 GB

Service

90

Coding in the delivered condition Possible change

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

9C:60

9F:8 Differential temperature

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

9F:0
to
9F:40

Differential temperature

adjustable from 0 to 40 K

Boiler/group "2"

Select "Boiler" for weather-compensated control units (see page 80).
Select "2" for constant temperature control units (see page 80).

Coding

Coding in the delivered condition Possible change

01:1 Single boiler system (only

for constant temperature
control units)

01:2 Multi boiler system with

Vitotronic 300-K

04:1 Minimum burner pause

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

04:0 Minimum burner pause set

permanently (specified by

boiler coding card)

06:... Maximum limit of the boil-

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

06:20
to
06:127

Maximum limit of the boiler

water temperature within

the ranges specified by the

boiler
07:1 Boiler number in multi

boiler systems (only for
constant temperature
control units)

07:2
to
07:8

Boiler number 2 to 8 in mul-

ti boiler systems

Code 2

General/group "1"

(cont.)

5623 520 GB

91

Coding in the delivered condition Possible change

08:... Maximum burner heating

output in kW in the case
of a multi boiler system

08:0
to
08:199

Maximum burner heating
output adjustable from 0 to
199 kW (limited by boiler­specific parameters) in

steps of 1 kW
0d:0 Do not adjust
0E:0 Do not adjust
13:1 Do not adjust
14:1 Do not adjust
15:1 Do not adjust
21:0 No service interval (hours

run) selected

21:1
to
21:100

Number of hours run be-

fore the burner should be

serviced is adjustable from

100 to 10,000 h

One adjusting step

≙

100 h
23:0 No time interval for burn-

er service

23:1
to
23:24

Interval adjustable from 1

to 24 months

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

dress is automatically set

and must be manually re-

set after a service has been

carried out)
28:0 No burner interval igni-

tion

28:1
to
28:24

Interval adjustable from 1 h

to 24 h. The burner is force-

started once every 30 s

(only when operating with

LPG).
2E:0 Do not adjust
2F:0 Venting program/fill pro-

gram disabled

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

30:3 Boiler circuit pump speed

controlled via 0-10 V in­terface (do not adjust)

38:0 Status burner control unit:

Operational (no fault)

38:≠0

Status burner control unit:

Faults

Code 2

Boiler/group "2"

(cont.)

5623 520 GB

Service

92

Select "DHW" for weather-compensated control units (see page 80).
Select "3" for constant temperature control units (see page 80).

Coding

Coding in the delivered condition Possible change

56:0 Set DHW temperature

adjustable from 10 to
60 °C

56:1 Set DHW temperature ad-

justable from 10 to over
60 °C

Note

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

58:0 Without auxiliary function

for DHW heating

58:10
to
58:60

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

59:0 Cylinder heating:

Starting point -2.5 K
Stopping point +2.5 K

59:1
to
59:10

Starting point adjustable
from 1 to 10 K below the set
value

5b:0 DHW cylinder directly

connected to the boiler

5b:1 DHW cylinder connected

downstream of the low loss
header

5E:0 Circulation pump for cyl-

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

5E:1 Circulation pump for cylin-

der heating stops at signal
"External blocking"

5E:2 Circulation pump for cylin-

der heating starts at signal
"External blocking"

5F:0 Circulation pump for cyl-

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

5F:1 Circulation pump for cylin-

der heating stops at signal
"External demand"

5F:2 Circulation pump for cylin-

der heating starts at signal
"External demand"

Code 2

DHW/group "3"

5623 520 GB

93

Coding in the delivered condition Possible change

60:20 During DHW heating, the

boiler water temperature
is max. 20 K higher than
the set DHW tempera­ture

60:5
to
60:25

The differential between

the boiler water tempera-

ture and the set DHW tem-

perature is adjustable from

5 to 25 K
62:2 Circulation pump with

2 min run-on time after
cylinder heating

62:0 Circulation pump without

run-on

62:1
to
62:15

Run-on time adjustable

from 1 to 15 min

63:0 Without auxiliary function

for DHW heating (only for
constant temperature
control units)

63:1 Auxiliary function: 1 x daily
63:2
to
63:14

Every 2 days to every 14

days

63:15 2 x daily
65:0 Do not adjust.
67:40 For solar DHW heating:

Set DHW temperature
40 °C. Reheating is sup­pressed above the selec­ted set temperature (boil­er is only connected as
backup if the rise in cylin­der temperature is too
low).

67:0

to

67:95

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

6F:... Maximum output for

DHW heating in %, speci­fied by the boiler coding
card

6F:0

to

6F:100

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

71:0 DHW circulation pump:

"ON" in accordance with
the time program (only for
weather-compensated
control units)

71:1 "OFF" during DHW heating

to set value 1

71:2 "ON" during DHW heating

to set value 1

72:0 DHW circulation pump:

"ON" in accordance with
the time program (only for
weather-compensated
control units)

72:1 "OFF" during DHW heating

to set value 2

72:2 "ON" during DHW heating

to set value 2

Code 2

DHW/group "3"

(cont.)

5623 520 GB

Service

94

Coding in the delivered condition Possible change

73:0 DHW circulation pump:

"ON" in accordance with
the time program (only for
weather-compensated
control units)

73:1
to
73:6

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

73:7 Constantly "ON"

Solar/group "4"

Select "Solar" for weather-compensated control units (see page 80).
Select "4" for constant temperature control units (see page 80).

Note

The solar group is only displayed if a solar control module, type SM1, is connected.

Coding

Coding in the delivered condition Possible change

00:8 Start temperature differ-

ential for solar circuit
pump 8 K .

00:2
to
00:30

Start temperature differen­tial adjustable from 2 to
30 K.

01:4 Stop temperature differ-

ential for solar circuit
pump 4 K.

01:1
to
01:29

Stop temperature differen­tial adjustable from 1 to
29 K.

02:0 Solar circuit pump is not

speed-controlled.

02:1 Solar circuit pump is

speed-controlled with
wave packet control.

02:2 Solar circuit pump is

speed-controlled with
PWM control.

03:10 Temperature differential

for the start of the speed
control 10 K.

03:5
to
03:20

Temperature differential
adjustable from 5 to 20 K.

04:4 Controller amplification of

the speed control 4 %/K.

04:1
to
04:10

Controller amplification ad­justable from 1 to 10 %/K.

05:10 Minimum speed of the so-

lar circuit pump 10 % of
the maximum speed.

05:2
to
05:100

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

Code 2

DHW/group "3"

(cont.)

5623 520 GB

95

Coding in the delivered condition Possible change

06:75 Maximum speed of the

solar circuit pump 75 % of
the maximum possible
speed.

06:1

to

06:100

Maximum speed of the so­lar circuit pump is adjusta­ble from 1 to 100 %.

07:0 Interval function of the so-

lar circuit pump switched
off.

07:1 Interval function of the so-

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

08:60 Set DHW temperature

(maximum cylinder tem­perature) 60 °C.

08:10

to

08:90

Set DHW temperature ad­justable from 10 to 90 °C.

09:130 Maximum collector tem-

perature (to protect the
system components)
130 °C.

09:20

to

09:200

Temperature adjustable
from 20 to 200 °C.

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.

0b:0 Frost protection function

for solar circuit switched
off.

0b:1 Frost protection function

for solar circuit switched on

(not required with

Viessmann heat transfer

medium).

0C:1 Delta T monitoring

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

0C:0 Delta T monitoring switch-

ed off.

0d:1 Night circulation monitor-

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

0d:0 Night circulation monitor-

ing switched off.

Code 2

Solar/group "4"

(cont.)

5623 520 GB

Service

96

Coding in the delivered condition Possible change

0E:1 Heat statement in con-

junction with Viessmann
heat transfer medium.

0E:2 Never adjust.
0E:0 No heat statement.

0F:70 Solar circuit flow rate at

the maximum pump
speed 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

10:0 Target temperature con-

trol switched off (see cod­ing address "11").

10:1 Target temperature control

switched on.

11:50 Set solar DHW tempera-

ture 50 °C.

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

■ Code "20:9" (heating of
two DHW cylinders) is
selected:
When one DHW cylin­der reaches its set
DHW temperature, the
second DHW cylinder
is heated.

11:10
to
11:90

The set solar DHW temper­ature is adjustable from 10
to 90 °C.

12:20 Minimum collector tem-

perature (minimum start
temperature for the solar
circuit pump) 20 °C.

12:0 No minimum limit enabled.
12:1
to
12:90

Minimum collector temper­ature adjustable from 1 to
90 °C.

20:0 No extended control func-

tions enabled.

20:1 Additional function for

DHW heating.

20:2 Differential temperature

control 2.

20:3 Differential temperature

control 2 and auxiliary func­tion.

20:4 Differential temperature

control 2 for central heating
backup.

20:5 Thermostat function.

Code 2

Solar/group "4"

(cont.)

5623 520 GB

97

Coding in the delivered condition Possible change

20:6 Thermostat function and

auxiliary function.

20:7 Solar heating via external

heat exchanger without ad­ditional temperature sen­sor.

20:8 Solar heating via external

heat exchanger with addi­tional temperature sensor.

20:9 Solar heating of two DHW

cylinders.

22:8 Start temperature differ-

ential with central heating
backup (code "20:4" must
be selected) 8 K.

22:2
to
22:30

Start temperature differen­tial adjustable from 2 to
30 K.

23:4 Shutdown temperature

differential with central
heating backup (code
"20:4" must be selected)
4 K.

23:2
to
23:30

Shutdown temperature dif­ferential adjustable from 1
to 29 K.

24:40 Start temperature for

thermostat function (code
"20:5" or "20:6" must be
selected) 40 °C.

24:0
to
24:100

Start temperature for ther­mostat function adjustable
from 0 to 100 K.

25:50 Shutdown temperature

for thermostat function
(code "20:5" or "20:6"
must be selected) 50 °C.

25:0
to
25:100

Shutdown temperature for
thermostat function adjust­able from 0 to 100 K.

26:1 Priority for DHW cylinder

1 with alternate heating.
(Code "20:9" must be se­lected).

26:0 Priority for DHW cylinder 1

without alternate heating.

26:2 Priority for DHW cylinder 2

without alternate heating.

26:3 Priority for DHW cylinder 2

with alternate heating.

26:4 Alternate heating without

priority for either DHW cyl­inder.

27:15 Alternate heating time

15 min.

27:5
to
27:60

The alternate heating time
is adjustable from 5 to
60 min.

Code 2

Solar/group "4"

(cont.)

5623 520 GB

Service

98

Coding in the delivered condition Possible change

The DHW cylinder with­out priority is heated at
most for the duration of
the set alternate heating
time if the DHW cylinder
with priority is heated up.

28:3 Alternate pause time

3 min.
After the selected alter­nate heating time for the
DHW cylinder without pri­ority has expired, the rise
in collector temperature is
captured during the alter­nate pause time.

28:1
to
28:60

The alternate pause time is
adjustable from 1 to
60 min.

Heating circuit 1, heating circuit 2, heating circuit 3/group "5"

Select "Heating circuit ..." for weather-compensated control units (see page 80).
Select "5" for constant temperature control units (see page 80).

Coding

Coding in the delivered condition Possible change

A0:0 Without remote control A0:1 With Vitotrol 200A/200RF

(automatic recognition)

A0:2 With Vitotrol 300A/300RF

or Vitohome 300 (automat­ic recognition)

A1:0 All possible settings at

the remote control can be
accessed

A1:1 Only party mode can be set

at the remote control (only
for Vitotrol 200 and
200 RF)

A2:2 Cylinder priority applica-

ble to heating circuit
pump and mixer

A2:0 Without cylinder priority ap-

plied to heating circuit
pump and mixer

A2:1 Cylinder priority only appli-

cable to mixer

Code 2

Solar/group "4"

(cont.)

5623 520 GB

99

Coding in the delivered condition Possible change

A2:3
to
A2:15

Reduced priority applied to
mixer (the heating circuit
receives a reduced amount
of energy)

A3:2 Outside temperature be-

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

A3:-9
to
A3:15

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

!

Please note

When selecting a value below 1 °C, there is a risk of pipes outside the thermal
envelope of the building freezing up.
The standby mode in particular should be taken into consideration, e.g. during
holidays.

Parameter Heating circuit pump
address A3:... "On" "Off"

-9 -10 °C -8 °C

-8 -9 °C -7 °C

-7 -8 °C -6 °C

-6 -7 °C -5 °C

-5 -6 °C -4 °C

-4 -5 °C -3 °C

-3 -4 °C -2 °C

-2 -3 °C -1 °C

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

1 °C
to

3 °C
to

15 14 °C 16 °C

Coding in the delivered condition Possible change

A4:0 With frost protection (only

for weather-compensa­ted control units).

A4:1 No frost protection; this set-

ting is only possible if code
"A3:-9" has been selected.

Code 2

Heating circuit 1, heating circuit 2, heating…

(cont.)

5623 520 GB

Service

100

Coding in the delivered condition Possible change

Note

"Important" observe for
code "A3".

A5:5 With heating circuit pump

logic function (economy
mode): 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 (only for

weather-compensated
control units)

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

Code 2

Heating circuit 1, heating circuit 2, heating…

(cont.)

5623 520 GB