Viessmann Vitodens 300 Istruzioni operative
VIESMANN
Service instructions
for heating engineers
Vitodens 300
Type WB3A, 4.2 to 13.0 kW
Wall mounted gas fired condensing boiler
Natural gas and LPG version
For applicability, see the last page
VITODENS 300
5692 569 GB 1/2005 Please keep safe
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.
Warranty
Non-observation of our service
instructions will void all warranty
rights.
Target group
These service instructions are exclu-
sively designed for qualified person-
nel.
Work on gas appliances must only be
carried out by a qualified gas fitter.
Only recognised contractors may con-
vert this boiler for use in countries
other than those stated on the type
plate. That contractor must also
arrange the acceptance in accor-
dance with the statutes of that coun-
try.
Work on electrical equipment must
only be carried out by a qualified elec-
trician.
The system must be commissioned by
the system installer or a qualified per-
son authorised by the installer.
Regulations
Observe the following when servicing
the equipment:
&all legal instructions regarding the
prevention of accidents,
&the TRGI, TRF and any special
requirements, or local regulations
&all legal instructions regarding
environmental protection,
&the Code of Practice of relevant
trade associations.
If you smell gas
Danger
Escaping gas can lead to
explosions which may lead to
serious injury.
&Never smoke. Prevent naked
flames and sparks.
&Never switch lights or electri-
cal appliances ON or OFF.
&Open windows and doors.
&Close the gas shut-off valve.
&Remove all people from the
danger zone.
&Observe the safety regula-
tions of your local gas sup-
plier, found on the gas meter.
&Notify your contractor from
outside the building.
Safety instructions
2
Safety instructions
5692 569 GB
If you smell flue gas
Danger
Flue gas can lead to life-threa-
tening poisoning.
&Shut down the heating sys-
tem.
&Ventilate the boiler room.
&Close doors to the living
space.
Repair work
on parts that fulfil a safety function is
not permitted.
Use only original Viessmann spare
parts, or equivalent parts that have
been approved by Viessmann.
Service work on the heating system
&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 mains isola-
tor.
&Safeguard the system against
unauthorised reconnection.
&When using gas as fuel, also close
the main gas shut-off valve and
safeguard against unauthorised
reopening.
Ancillary components, spare and
wearing parts
!Please note
Components which are not
tested with the heating system,
the installation of non-
approved spare parts and un-
authorised conversions may
lead to damage on the heating
system, or may affect its func-
tion and void all warranties.
For conversions or replace-
ments, use only original spare
parts supplied or approved by
Viessmann.
Safety instructions (cont.)
3
Safety instructions
5692 569 GB
Initial start-up, inspection, maintenance
Steps –initial start-up, inspection and maintenance .................................... 5
Further details regarding the individual steps .............................................. 7
Coding
Code 1........................................................................................................ 39
Code 2........................................................................................................ 42
Resetting codes to the delivered condition ................................................. 61
Service scans
Service level overview ................................................................................ 63
Temperatures, boiler coding card and brief scans ....................................... 63
Checking outputs (relay test) ...................................................................... 67
Scanning operating conditions and sensors ................................................ 69
Troubleshooting
Fault display ............................................................................................... 72
Calling up fault codes from the fault memory (fault history) .......................... 73
Fault codes................................................................................................. 74
Repairs ...................................................................................................... 83
Function description
Constant temperature control unit ............................................................... 93
Weather–compensated control unit............................................................. 94
Extensions for external connections (accessories) ...................................... 96
Control functions ........................................................................................ 100
Electronic combustion control unit............................................................... 105
Designs
Connection and wiring diagrams –internal connections .............................. 106
Connection and wiring diagrams –external connections.............................. 107
Parts lists .................................................................................................. 109
Specification............................................................................................. 122
Certificates
Declaration of conformity ............................................................................ 123
Manufacturer's certificate according to the 1st BImSchV [Germany]............. 124
Keyword index .......................................................................................... 125
Index
4
Index
5692 569 GB
For further information regarding individual steps, see the pages indicated.
Commissioning steps
Inspection steps
Maintenance steps Page
!!!
•01. Filling the heating system ................................................. 7
•02. Venting the boiler .................................................................. 8
•03. Venting the heating system............................................... 8
•04. Filling the siphon with water............................................. 9
•05. Checking the power supply connection
•06. Selecting the language (if required) - only for
weather-compensated control units ............................. 9
• • 07. Setting the time and date (if required) –only for
weather-compensated control units ............................. 10
• • 08. Checking the gas type......................................................... 10
•09. Changing the gas type (only for operation with
LPG) ........................................................................................... 11
••• 10. Function sequence and possible faults ....................... 11
••• 11. Checking the static and supply pressure .................... 13
••• 12. Checking the combustion quality................................... 15
•13. Setting the maximum output ........................................... 16
••• 14. Checking all connections on the primary and DHW
side for leaks
••• 15. Checking the burner (recording values on page
116 of the commissioning report)
•16. Checking the balanced flue system for soundness
(annular gap check) ............................................................. 17
• • 17. Removing the burner and checking the burner
gasket (replace gasket every two years)...................... 18
• • 18. Checking the burner gauze assembly........................... 19
• • 19. Checking and adjusting the ignition and ionisation
electrodes ................................................................................ 20
Steps –initial start-up, inspection and maintenance
5
Initial start-up, inspection, maintenance
5692 569 GB
Commissioning steps
Inspection steps
Maintenance steps Page
!!!
• • 20. Cleaning the combustion chamber/heating
surfaces and fitting the burner ........................................ 21
• • 21. Checking the condensate drain and cleaning the
siphon........................................................................................ 22
• • 22. Checking the neutralising system (if installed)
• • 23. Checking the diaphragm expansion vessel and
system pressure.................................................................... 22
••• 24. Checking the function of all safety valves
••• 25. Checking the tightness of electrical connections
••• 26. Checking all gas equipment for soundness at
operating pressure .............................................................. 23
••• 27. Checking the ionisation current ..................................... 24
••• 28. Checking external LPG safety valve (if required)
•29. Matching the control unit to the heating system ...... 25
•30. Connecting the weather-compensated control unit
into the LON system (e.g. with the Vitotronic 050) . . . 31
•31. Implementing a user check (in conjunction with
the LON system) .................................................................... 32
•32. Adjusting the heating curve (only for weather-
compensated control units).............................................. 33
•33. Instructing the system user .............................................. 37
•34. Scanning and resetting the "Maintenance" display 37
Steps –initial start-up, inspection and . . . (cont.)
6
Initial start-up, inspection, maintenance
5692 569 GB
Filling the heating system
!Please note
Unsuitable fill water increases the level of deposits and corrosion and
may lead to boiler damage.
&Thoroughly flush the entire heating system prior to filling it with water.
&Only use fill water of potable quality.
&Soften fill water harder than 3.58 mmol/l.
&An anti-freeze additive suitable for heating systems can be mixed with
the fill water.
1. Check the inlet pressure of the dia-
phragm expansion vessel.
2. Close the gas shut-off valve.
3. Drain the heating system via boiler
fill & drain valve A(minimum sys-
tem pressure >0.8 bar).
Note
&If the control unit had not already
been switched ON before filling
began: The diverter valve is in its
central position, and the system
will be completely filled.
&If the control unit had already
been switched ON before filling
began: In code 1, set coding
address "2F:2" (see page 39).
&At this point, the diverter valve is
in its central position.
&Whilst the filling program runs,
the display shows "bF" (constant
temperature control unit) or
"Filling" (weather-compensated
control unit).
4. Close boiler fill & drain valve A.
5. Set coding address "2F:0".
Further details regarding the individual steps
7
Initial start-up, inspection, maintenance
5692 569 GB
Venting the boiler
1. Close the shut-off valves on the
heating water side.
2. Connect the drain hose between
top valve Band a drain outlet.
3. Open valves Aand B, and vent
at mains pressure until no sound of
escaping air can be heard.
4. Close valves Aand Band open
the primary shut-off valves.
Venting the heating system
1. Close the gas shut-off valve and
switch ON the control unit.
Further details regarding the individual steps (cont.)
8
Initial start-up, inspection, maintenance
5692 569 GB
2. Activate the venting program via
coding address "2F:1".
Note
To call up code 1 and for setting the
coding address, see page 39.
For function and sequence of the
venting program, see page 101.
Whilst the venting program runs,
the display shows "EL" (constant
temperature control unit) or
"Venting" (weather-compensated
control unit).
3. Check the system pressure.
Filling the siphon with water
1. Remove the retaining clip and
siphon A.
2. Fill the siphon with water.
3. Fit siphon Aand secure with the
retaining clip.
Selecting the language (if required) - only for weather-com-
pensated control units
1. Press c.
The display shows "Select heating
circuit".
2. Press d.
3. After approx. 4 s press c.
4. Select the required language with
b.
5. Confirm with d.
Further details regarding the individual steps (cont.)
9
Initial start-up, inspection, maintenance
5692 569 GB
Setting the time and date (if required) –only for weather-
compensated control units
Note
During commissioning, or after prolonged time out of use, it may be necessary
to set the time and date, if the time flashes in the display.
1. Set the correct time with a/b.
2. Confirm with d.
3. Set the current date with a/b.
4. Confirm with d.
Checking the gas type
The boiler is equipped with an electronic combustion control unit, which adjusts
the burner for optimum combustion in accordance with the prevailing gas qual-
ity.
&For natural gas, there is consequently no adjustment required across the
entire Wobbe range.
&The boiler can be operated in the Wobbe index range 10.0 to 16.1 kWh/m
3
(36.0 to 58.0 MJ/m
3
).
&The burner must be adjusted for operation with LPG (see "Changing the gas
type" on page 11).
1. Determine the gas type and Wobbe
index (Wo) by asking your local
mains gas or LPG supplier.
2. Convert the burner for operation
with LPG (see page 10).
3. Record the gas type in the service
report on page 116.
Further details regarding the individual steps (cont.)
10
Initial start-up, inspection, maintenance
5692 569 GB
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