Viessmann Vitotronic 200 KW2 Quick guide

VITOTRONIC 200
Installation and
service instructions
for heating engineers
Vitotronic200
TypeKW2
Weather−compensated, digital boiler and heating circuit control unit
See applicability on the last page.
5862700GB2/2005 Please keep safe

2
Safety instructions
Safety instructions
¨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.
HWork on gas equipment must only
be carried out by a registered gas
fitter.
HElectrical work must only be
carried out by a qualified
electrician.
HThe 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
Hall legal instructions regarding the
prevention of accidents,
Hall legal instructions regarding
environmental protection,
Hregulations issued by professional
bodies,
Hall current safety regulations as
defined by DIN, EN, DVGW, TRGI,
TRF, VDE and all locally applicable
standards.
If you notice a smell of gas
¨Danger
Escaping gas can lead to
explosions which may lead to
serious injury.
HDo not smoke! Prevent
naked flames and sparks.
Never switch electrical lights
or equipment.
HOpen windows and doors.
HClose the gas shut−off valve.
HShut down the heating
system.
HRemove all people from the
danger zone.
HObserve the safety
regulations of your local gas
supplier found on the gas
meter.
5862700GB

3
Safety instructions
Safety instructions (cont.)
If you smell flue gas
¨Danger
Flue gas can lead to
life−threatening poisoning.
HShut down the heating
system
HVentilate the boiler room.
HClose all doors leading to the
living space.
Working on the heating system
HIsolate the system from the mains
power supply and check that it is
no longer ’live’, e.g. by removing a
separate fuse or by means of a
mains electrical isolator.
HSafeguard the system against
unauthorised reconnection.
HWhen using gas as fuel, also close
the main gas shut−off valve and
safeguard against unauthorised
reopening.
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
infringe our warranty
conditions.
For replacements, use only
original spare parts from
Viessmann or those which are
approved by Viessmann.
5862700GB

4
Index
Index
Heating system designs
System versions 1 to 5 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
Summary of electrical connections 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inserting cables and applying strain relief 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing the high limit safety cut−out setting 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing the control thermostat setting 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inserting the boiler coding card 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor connection 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pump connection 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External connection to plug X12 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burner connection 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mains power supply 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the top part of the control unit 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Opening the control unit 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commissioning
Controls and display elements 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the heating circuit allocation 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the high limit safety cut−out 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing the display language 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking outputs (actuators) and sensors 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Matching up coding addresses 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting heating curves 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service scans
Service level summary 30
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperatures, boiler coding card and brief scans 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scanning operating conditions 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scanning and resetting the Maintenance display 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting
Faults which are displayed at the programming unit 36
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downloading fault codes from the fault memory (fault history) 42. . . . . . . . . . . . . . . . . . . . . . .
Faults which are not displayed at the programming unit 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Function description
Boiler temperature control 46
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating circuit control 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cylinder temperature control 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5862700GB

5
Index
Index (cont.)
Components
Components from the parts list 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radio clock receiver 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flue gas temperature sensor 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mixer circuit extension kit 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature limiter 66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote control 67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Room temperature sensor 73. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control module V 75. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
KM BUS distributor 76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boiler coding card 76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vitoair draught stabiliser 77. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Function extension 0−10V 78. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coding
Resetting codes to the delivered condition 79
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 1 79. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 2 82. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screed drying function diagrams 102. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burner switching hysteresis 103. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts list 105. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connection and wiring diagram 108. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specification 110. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Settings and equipment 111. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keyword index 115. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applicability 120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5862700GB

6
Heating system designs
System version 1
One direct connected heating circuit without mixer
ABoiler with Vitotronic 200
BDHW cylinder
CKM BUS user or
KM BUS distributor, (only with
several KM BUS users)
DHeating circuit without mixer A1
Plug
!Outside temperature sensor
§Boiler temperature sensor
%Cylinder temperature sensor
sÖA1 Heating circuit pump
(accessory)
sA Cylinder primary pump
(accessory)
sK DHW circulation pump (on site)
fÖ Mains power connection
(230V/50Hz)
fA Burner stage 1
lÖ Burner stage 2/mod.
aVG KM BUS user/distributor
(accessory)
a:A Two−stage/mod. burner
extension
Automatic changeover
00:2 with DHW cylinder
5862700GB
A1
D
B
C
A

A
B
M
M2
D
C
E
7
Heating system designs
System version 2
One mixer circuit
ABoiler with Vitotronic 200
BDHW cylinder
CKM BUS user or
KM BUS distributor, (only with
several KM BUS users)
DMixer circuit M2
ECheck valve; only required if
joined to a connector.
Plug
!Outside temperature sensor
?Flow temperature sensor
(accessory)
§Boiler temperature sensor
%Cylinder temperature sensor
aJ Return temperature sensor
(accessory)*1
sÖM2Heating circuit pump mixer
circuit (accessory)
sA Cylinder primary pump
(accessory)
sK DHW circulation pump (on site)
fÖ Mains power connection
(230 V/50 Hz)
fA Burner stage 1
gS Mixer motor (accessory)
lÖ Burner stage 2/mod.
aVG KM BUS user/distributor
(accessory)
a:A Two−stage/mod. burner
extension
Required coding
00:3 System with one mixer circuit, without DHW cylinder
or
00:4 System with one mixer circuit, with DHW cylinder
*1e.g. for underfloor heating control via flow and return temperature sensor.
5862700GB

8
Heating system designs
System version 3
One direct connected heating circuit without mixer and one mixer circuit
ABoiler with Vitotronic 200
BDHW cylinder
CKM BUS user or
KM BUS distributor, (only with
several KM BUS users)
DMixer circuit M2
EHeating circuit without mixer A1
FCheck valve; only required, if
joined to a connector.
Plug
!Outside temperature sensor
?Flow temperature sensor
(accessory)
§Boiler temperature sensor
%Cylinder temperature sensor
aJ Return temperature sensor
(accessory)*1
sÖA1 Heating circuit pump
(accessory)
sÖM2Heating circuit pump mixer
circuit (accessory)
sA Cylinder primary pump
(accessory)
sK DHW circulation pump (on site)
fÖ Mains power connection
(230 V/50 Hz)
fA Burner stage 1
gS Mixer motor (accessory)
lÖ Burner stage 2/mod.
aVG KM BUS user/distributor
(accessory)
a:A Two−stage/mod. burner
extension
Automatic changeover
00:6 with DHW cylinder
*1e.g. for underfloor heating control via flow and return temperature sensor.
5862700GB
B
M
M2
D
C
A1
E
A
F

9
Installation
Summary of electrical connections
The illustration shows the bottom part of the control unit as viewed from the
rear.
5862700GB
X12

10
Installation
Summary of electrical connections (cont.)
Plug 230 V~
sÖ Heating circuit pump A1
(accessory)
sÖ Heating circuit pump mixer
circuitM2 (accessory)
sA Cylinder primary pump
(accessory)
sK DHW circulation pump (on site)
fÖ Mains power connection
fA Burner
gS Mixer motor (accessory)
X12 External burner start (stage1)
Low voltage plug
!Outside temperature sensor
?Flow temperature sensor
(accessory)
§Boiler temperature sensor
%Cylinder temperature sensor
aG Flue gas temperature sensor
(accessory)
aJ Return temperature sensor
(accessory)
aVG KM BUS user or distributor
(accessory)
a:A Two−stage/mod. burner
extension (part of the standard
boiler delivery)
When connecting external switching
contacts or components to the
protective low voltage of the control
unit, please observe the safety
requirements of protection class II,
i.e. 8.0 mm air gap/creeping distance
or 2.0 mm insulation thickness from
’live’ components.
Ensure a safe electrical separation
for all on−site components (incl.
PC/laptops) to EN60335 or IEC65.
5862700GB

11
Installation
Inserting cables and applying strain relief
Note
Blank off unnecessary knockouts in the lower part of the control unit with
cable grommets (not cut out).
5862700GB
1.
3.
4.
2.
5.
6.
4.

12
Installation
Changing the high limit safety cut−out setting (if required)
Adjustment to 100ºC (EGO)
In the delivered condition, the high limit safety cut−out is set to 110ºC.
Note
This setting change is irreversible.
If adjusted to 100 ºC, do not set the control thermostat above 75 ºC.
ASlotted screw
5862700GB
A
4.
2.
3.
1.

13
Installation
Changing the high limit safety cut−out setting (cont.)
Adjustment to 100ºC (JUMO)
In the delivered condition, the high limit safety cut−out is set to 110ºC.
Note
If adjusted to 100 ºC, do not set the control thermostat above 75 ºC.
5862700GB
2.
1.
4.
3.
5.
6.

14
Installation
Changing the control thermostat setting (if required)
Adjustment to 87ºC/95ºC
The control thermostat is supplied with a factory setting of 75 ºC.
Note
Do not set the control thermostat above 75 ºC if the high limit safety cut−out
has been adjusted to 100 ºC.
1. Lever out and remove rotary
selector R.
2. Using a pair of pointed pliers,
break off the cams between 75
and 90 or 95 from the stop disc, as
shown in the drawing.
3. Fit rotary selector Rso that the
mark lies between 75 and 90 or 95.
Turn rotary selector Rfully
clockwise to the end stop.
!Please note
Excessive DHW temperatures
can damage the DHW cylinder.
If the system is operated in
conjunction with a DHW
cylinder, ensure that the
maximum permissible DHW
temperature is not exceeded.
If necessary, install suitable
safety equipment for this
purpose.
5862700GB
3.
2.
1.

15
Installation
Inserting the boiler coding card
Only use the boiler coding card included with the boiler product
documentation (also see table).
Insert the boiler coding card through
the cut−out in the cover into slot X7.
Boiler Coding card Part no.
Vitola 200, type VB2A and VX2A E1 7818 915
Vitolaplus 300
Vitocrossal 300, type CU3 Cb 7818 913
5862700GB

16
Installation
Sensor connection
AFlue gas temperature sensor
BBoiler temperature sensor
CCylinder temperature sensor
DOutside temperature sensor
(cores may be interchanged)
Installation point for outside
temperature sensor
HNorth or north−western wall,
2 to 2.5 m above ground level;
in multi−storey buildings, in the
upper half of the second floor
HNot above windows, doors or
ventilation outlets
HNot immediately below balcony
or gutter
HDo not render over
Connection
2−core cable with a maximum
length of 35 m and a
cross−section of 1.5mm2(copper)
EFlow temperature sensor
FReturn temperature sensor
5862700GB
CB
Mixer circuit
1 2 31 2 31 2 3
145 35 1191 2
1 2 3 1 2 3 1 2 3
A
15
E FD
1 2 3
A
17
1 2 3

17
Installation
Pump connection
Available pump connections
sÖ Heating circuit pump A1 and M2
sA Cylinder primary pump
sK DHW circulation pump
Pumps 230 V~ Pumps 400 V~
AContactor
BThree−phase pump
Rated current: 4 (2) A~
Recommended
connecting
cable: H05VVF3G 0.75 mm2
or
H05RNF3G 0.75 mm2
For selecting the contactor:
Rated voltage: 230 V~
Rated current: 4 (2) A ~
Recommended
connecting
cable: H05VVF3G 0.75 mm2
or
H05RNF3G 0.75 mm2
Variable speed pump
Connect at plug aVG in the control unit or in the KM BUS distributor.
5862700GB
M
1~
LN L1L2 L3 N PE
M
3~
A B

18
Installation
External connection to plug X12
!Please note
’Live’ contacts lead to short circuits or phase failure. The external
connections must be zero volt.
AExternal start
(zero volt contact)
Rated voltage: 230 V~
Rated current: 6 A ~
Recommended
connecting
cable: H05VVF3G 0.75 mm2
External burner start (stage 1)
Connect the zero volt contact. If the
contact is closed, the first burner
stage is started, and the boiler water
temperature is regulated by the
control thermostat.
5862700GB
X12
A
12

19
Installation
Burner connection
Pressure−jet oil/gas burner
Connect the burner to DIN 4791.
The burner cables are included in the standard boiler delivery.
Max. current 4 (2) A.
ATo control unit
BTo burner
Burner without plug
Install the mating plug from
Viessmann or from the burner
manufacturer; connect the burner
cable.
Terminal codes
L1 Phase via high limit safety
cut−out to the burner
PE Earthing conductor to burner
N Neutral conductor to burner
T1,T2 Control chain
S3 Connection for burner fault
B4 Connection for hours run
meter
BSignal pass direction:
Control unit →burner
YSignal pass direction:
Burner →control unit
Equipment codes
STB High limit safety cut−out of
control unit
TR Control thermostat
H1 Burner fault signal
BZ Hours run meter
5862700GB
A
B
Fault H1

20
Installation
Burner connection (cont.)
Two−stage/modulating burner extension
The function extension is supplied with the boiler.
Max. power consumption
HTwo−stage: 1 (0.5) A
HModulating: 0.1 (0.05) A
Observe coding addresses 02, 10 to 13, 15 to 18, 1A, 26 and 29 (see overview).
ATo control unit
BTo burner
CJunction box with relays
K1 and K2
Terminal codes
T6, T7, T8 Control chain Burner
stage 2 or modulation
controller (for two−stage
operation via two−point
controller; for modulating
mode via three−point
controller)
T6 From the burner
T7 Mod. burner closed
T8 Mod. burner open/
stage 2 ON
BSignal pass direction:
Control unit →burner
YSignal pass direction:
Burner →control unit
Colour coding to DIN IEC60757
BK black
BN brown
BU blue
5862700GB
C
B
A