Viessmann VITODENS 300-W User manual

VIESMANN
Service instructions
for contractors
Vitodens 300-W
Type WB3C, 3.8 to 35.0 kW
Wall mounted gas fired condensing boiler
Natural gas and LPG version
For applicability, see the last page
VITODENS 300-W
5692 673 GB 5/2008 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.
Target group
These instructions are exclusively
designed for qualified personnel.
&Work on gas equipment must only
be carried out by a qualified gas fit-
ter.
&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.
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).
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 all doors leading to the
living space.
Safety instructions
2
Safety instructions
5692 673 GB

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 dis-
charges.
Touch earthed objects, such as
heating or water pipes, to dis-
charge static loads.
Repair work
!Please note
Repairing components which
fulfil a safety function can com-
promise 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. Instal-
ling non-authorised compo-
nents and non-approved
modifications/conversion can
compromise safety and may
invalidate our warranty.
For replacements, use only ori-
ginal spare parts from
Viessmann or those which are
approved by Viessmann.
Safety instructions (cont.)
3
Safety instructions
5692 673 GB

Commissioning, inspection, maintenance
Steps - commissioning, inspection and maintenance................................... 5
Further details regarding the individual steps .............................................. 7
Coding
Code 1........................................................................................................ 36
Code 2........................................................................................................ 39
Service scans
Service level overview ............................................................................... 61
Temperatures, boiler coding card and brief scans ....................................... 62
Checking outputs (relay test) ...................................................................... 65
Scanning operating conditions and sensors ................................................ 67
Troubleshooting
Fault display ............................................................................................... 69
Fault codes................................................................................................. 71
Repairs ...................................................................................................... 82
Function description
Constant temperature control unit ............................................................... 89
Weather-compensated control unit.............................................................. 90
Extensions for external connections (accessories) ...................................... 93
Control functions ........................................................................................ 96
Remote control DIP switches ...................................................................... 102
Electronic combustion control unit............................................................... 103
Designs
Connection and wiring diagram –internal connections ................................ 105
Connection and wiring diagram –external connections ............................... 107
Parts lists .................................................................................................. 109
Commissioning/service reports ............................................................... 115
Specification............................................................................................. 116
Certificates
Declaration of conformity ............................................................................ 117
Manufacturer's certificate according to the 1st BImSchV [Germany]............. 118
Keyword index .......................................................................................... 119
Index
4
Index
5692 673 GB

For further information regarding the individual steps, see the page indicated
Commissioning steps
Inspection steps
Maintenance steps Page
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•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 all connections on the heating water
side and DHW side for leaks
•06. Checking the power supply connection
• • 07. Setting the time and date (if required) –only for
weather-compensated control units.............................. 10
•08. Selecting the language (if required) –only for
weather-compensated control units.............................. 10
• • 09. Checking the gas type......................................................... 11
•10. Gas type conversion (only for operation with LPG).12
••• 11. Function sequence and possible faults........................ 12
••• 12. Checking the static and supply pressure .................... 14
•13. Setting the maximum output ........................................... 15
•14. Checking the balanced flue system for tightness
(annular gap check) ............................................................. 16
• • 15. Removing the burner and checking the burner
gasket (replace gasket every 2 years)........................... 17
• • 16. Checking the burner gauze assembly........................... 18
• • 17. Checking and adjusting the ignition and ionisation
electrodes ................................................................................ 19
• • 18. Cleaning the combustion chamber/heating
surfaces and fitting the burner ........................................ 20
• • 19. Checking the condensate drain and cleaning the
siphon........................................................................................ 21
• • 20. Checking the neutralising system (if installed)
Steps - commissioning, inspection and maintenance
5
Commissioning, inspection, maintenance
5692 673 GB