Viessmann VITODENS 050-W Quick guide

Installation and service
instructions
for contractors
VIESMANN
Vitodens 050-W
Type BPJD, 6.5 to 35.0 kW
Wall mounted gas condensing boiler
For natural gas and LPG
Gas Council Number: 47 819 31, 47 819 32
VITODENS 050-W
5675991 GB/en 11/2017 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 envi-
ronmental pollution.
Note
Details identified by the word "Note"
contain additional information.
Target group
These instructions are exclusively
intended for qualified contractors.
■ Work on gas installations may only
be carried out by a registered gas fit-
ter.
■ Work on electrical equipment may
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 to be observed
■ National installation regulations
■ Statutory regulations for the preven-
tion of accidents
■ Statutory regulations for environmen-
tal protection
■ Codes of practice of the relevant
trade associations
■ All current safety regulations as
defined by DIN, EN, DVGW, TRGI,
TRF, VDE and all locally applicable
standards
aÖNORM, EN,
ÖVGW G K directives,
ÖVGW-TRF and ÖVE
cSEV, SUVA, SVGW, SVTI,
SWKI, VKF and EKAS guideline
1942: LPG, part 2
Safety instructions
Safety instructions
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Safety instructions for working on the system
Working on the system
■ Where gas is used as the fuel, close
the main gas shut-off valve and safe-
guard it against unintentional reopen-
ing.
■ Isolate the system from the power
supply, e.g. by removing the separate
fuse or by means of a mains isolator,
and check that it is no longer live.
■ Safeguard the system against recon-
nection.
■ Wear suitable personal protective
equipment when carrying out any
work.
Danger
Hot surfaces can cause burns.
■ Before maintenance and serv-
ice work, switch OFF the
appliance and let it cool down.
■ Never touch hot surfaces on
the boiler, burner, flue system
or pipework.
!Please note
Electronic assemblies can be
damaged by electrostatic dis-
charge.
Prior to commencing work,
touch earthed objects such as
heating or water pipes to dis-
charge static loads.
Repair work
!Please note
Repairing components that fulfil
a safety function can compro-
mise the safe operation of the
system.
Replace faulty components only
with genuine Viessmann spare
parts.
Auxiliary components, spare and
wearing parts
!Please note
Spare and wearing parts that
have not been tested together
with the system can compro-
mise its function. Installing non-
authorised components and
making non-approved modifica-
tions or conversions can com-
promise safety and may invalid-
ate our warranty.
For replacements, use only orig-
inal spare parts supplied or
approved by Viessmann.
Safety instructions
Safety instructions (cont.)
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Safety instructions for operating the system
If you smell gas
Danger
Escaping gas can lead to explo-
sions which may result in seri-
ous injury.
■ Do not smoke. Prevent naked
flames and sparks. Never
switch lights or electrical appli-
ances on or off.
■ Close the gas shut-off valve.
■ Open windows and doors.
■ Evacuate any people from the
danger zone.
■ Notify your gas or electricity
supply utility from outside the
building.
■ Have the power supply to the
building shut off from a safe
place (outside the building).
If you smell flue gas
Danger
Flue gas can lead to life threat-
ening poisoning.
■ Shut down the heating sys-
tem.
■ Ventilate the installation site.
■ Close doors to living spaces
to prevent flue gases from
spreading.
What to do if water escapes from the
appliance
Danger
If water escapes from the appli-
ance there is a risk of electrocu-
tion.
Switch OFF the heating system
at the external isolator (e.g. fuse
box, domestic distribution
board).
Danger
If water escapes from the appli-
ance there is a risk of scalding.
Never touch hot heating water.
Condensate
Danger
Contact with condensate can be
harmful to health.
Never let condensate touch your
skin or eyes and do not swallow
it.
Flue systems and combustion air
Ensure that flue systems are clear and
cannot be sealed, for instance due to
accumulation of condensate or other
external causes.
Avoid continuous condensate disposal
with a wind protector.
Ensure an adequate supply of combus-
tion air.
Inform system users that subsequent
modifications to the building character-
istics are not permissible (e.g. cable/
pipework routing, cladding or parti-
tions).
Safety instructions
Safety instructions (cont.)
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Danger
Leaking or blocked flue sys-
tems, or an inadequate supply
of combustion air can cause life
threatening poisoning from car-
bon monoxide in the flue gas.
Ensure the flue system is in
good working order. Vents for
supplying combustion air must
be non-sealable.
Extractors
Operating appliances that exhaust air
to the outside (extractor hoods, extrac-
tors, air conditioning units, etc.) can
create negative pressure. If the boiler is
operated at the same time, this can
lead to a reverse flow of flue gas.
Danger
The simultaneous operation of
the boiler and appliances that
exhausts air to the outside can
result in life threatening poison-
ing due to a reverse flow of flue
gas.
Fit an interlock circuit or take
suitable steps to ensure an ade-
quate supply of combustion air.
Safety instructions
Safety instructions (cont.)
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Installation instructions
Information
Disposal of packaging.......................................................................................... 8
Symbols................................................................................................................ 9
Intended use......................................................................................................... 10
Product information.............................................................................................. 10
Preparing for installation................................................................................... 13
Installation sequence
Mounting the boiler and making connections....................................................... 17
Opening the programming unit............................................................................. 22
Electrical connections........................................................................................... 23
Service instructions
Commissioning, inspection, maintenance
Steps - commissioning, inspection and maintenance.......................................... 26
Further details regarding the individual steps....................................................... 27
Troubleshooting
Function sequence and possible faults................................................................ 50
Fault display......................................................................................................... 51
Repairs................................................................................................................. 56
Changing the gas type
Converting from LPG to natural gas..................................................................... 67
Control unit
Functions and operating conditions in weather-compensated mode................... 69
Designs
Connection and wiring diagrams.......................................................................... 71
Parts lists
Overview of assemblies....................................................................................... 76
Casing assembly.................................................................................................. 78
Heat cell assembly............................................................................................... 80
Burner assembly.................................................................................................. 82
Hydraulic assembly.............................................................................................. 84
Grundfos hydraulic assembly............................................................................... 86
Control unit assembly........................................................................................... 88
Miscellaneous assembly...................................................................................... 90
Index
Index
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Specification....................................................................................................... 91
Disposal
Final decommissioning and disposal.................................................................... 92
Certificates
Declaration of conformity...................................................................................... 93
Keyword index.................................................................................................... 95
Index
Index (cont.)
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Please dispose of packaging waste in
line with statutory regulations.
DE: Use the disposal system organ-
ised by Viessmann.
AT: Use the ARA statutory disposal
system (Altstoff Recycling Austria
AG, licence number 5766).
CH: Packaging waste is disposed of
by the HVAC contractor.
Information
Disposal of packaging
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Sym-
bol
Meaning
Reference to other document
containing further information
1.
Step in a diagram:
The numbers correspond to
the order in which the steps
are carried out.
Warning of material losses and
environmental pollution
Live electrical area
Pay particular attention.
■ Component must audibly
click into place.
or
■ Acoustic signal
■ Fit new component.
or
■ In conjunction with a tool:
Clean the surface.
Dispose of component correct-
ly.
Dispose of component at a
suitable collection point. Do
not dispose of component in
domestic waste.
Information
Symbols
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Installation

10
The appliance is intended solely for
installation and operation in sealed
unvented heating systems that comply
with EN 12828, with due attention paid
to the associated installation, service
and operating instructions. It is only
designed for heating up heating water
that is of potable water quality.
Intended use presupposes that a fixed
installation in conjunction with permissi-
ble, system-specific components has
been carried out.
Commercial or industrial usage for a
purpose other than heating the building
or DHW shall be deemed inappropriate.
Any usage beyond this must be
approved by the manufacturer in each
individual case.
Incorrect usage or operation of the
appliance (e.g. the appliance being
opened by the system user) is prohibi-
ted and will result in an exclusion of lia-
bility. Incorrect usage also occurs if the
components in the heating system are
modified from their intended use (e.g. if
the flue gas and ventilation air paths
are sealed).
Product information
Vitodens 050-W, type BPJD
Preset for operation with natural gas.
Conversion to LPG P requires a gas
conversion kit.
Gas Council No.
■ 29 kW combi: 47 819 31
■ 35 kW combi: 47 819 32
Conversion for other countries
The Vitodens 050-W may generally
only be delivered to countries listed on
the type plate. For deliveries to other
countries, approved contractors must
arrange individual approval on their
own initiative and in accordance with
the law of the country in question.
Product description
The Vitodens 050-W is available as a
gas condensing combi boiler with inte-
gral plate heat exchanger for DHW
heating. For the connection of heating
circuits and the DHW line, see
page 16 onwards.
The Vitodens 050-W is set up for oper-
ation with a constant boiler water tem-
perature.
The appliance is equipped with a
sealed unvented hydraulic system with
2 connections for the heating flow and
return and 2 connections for DHW
heating.
Information
Intended use
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The following components are integra-
ted into the hydraulic system:
■ Circulation pump
■ 3-way diverter valve
■ Safety valve
■ Diaphragm expansion vessel
■ Plate heat exchanger for DHW heat-
ing
Connecting accessories
A time switch (accessories) can be con-
nected to the control unit with a low
voltage supply.
Siting
Suitable siting locations include:
■ Recreational rooms and other living
spaces
■ Ancillary rooms without their own
ventilation
■ Cupboards (open at the top)
■ Recesses without compulsory clear-
ance towards combustible materials
■ Attic rooms (pitched attics and long
panes) where the balanced flue pipe
can be routed directly through the
roof
Since the flue pipe connection for room
sealed operation is surrounded by com-
bustion air (coaxial pipe), no clearances
towards combustible materials need be
maintained. For further details, see the
technical guide on flue systems for the
Vitodens.
The installation room must be safe from
the risk of frost.
Operation of the Vitodens 050-W in wet rooms
Area 0
Area 1
Area
2
Area 2
600
2250
Information
Product information (cont.)
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Installation

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The Vitodens is approved for installa-
tion in wet rooms (e.g. bathroom or
shower rooms) (protection IP X4 D,
splashproof).
When installing the Vitodens in wet
rooms, observe the safety zones and
minimum wall clearances according to
VDE 0100 [or local regulations] (see
also "Electrical safety zone"). The
Vitodens may be installed in safety
zone 1 if hosed water (e.g. from mas-
sage showers) is prevented.
Electrical equipment in rooms contain-
ing a bathtub or a shower must be
installed in such a way that users can-
not be exposed to dangerous body cur-
rents.
VDE 0100 specifies that cables supply-
ing permanently installed consumers in
zones 1 and 2 should only be run verti-
cally and routed into the equipment
from the back.
Information
Product information (cont.)
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Preparing for boiler installation
Dimensions and connections
41
5
250
400
58 58
123123
B
AC E
F
D
156
350
125
867
68
707
150
642
F
700
Shown without fittings
AHeating flow 7 22 mm
BDHW 7 15 mm
CGas connection 7 22 mm
DCold water 7 15 mm
EHeating return 7 22 mm
FCondensate drain/safety valve
drain: plastic hose 7 22 mm
Preparing for installation
Preparing for installation
5675991
Installation

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Minimum clearances
Maintain a clearance of 700 mm in front
of the Vitodens for maintenance purpo-
ses. Maintenance clearances to the l.h.
or r.h. side of the Vitodens are not
required.
Preparing for installation
Preparing for installation (cont.)
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Fitting the wall mounting bracket
250
A
Ø10
145
AVitodens installation template
Preparing for installation
Preparing for installation (cont.)
5675991
Installation

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1. Position the supplied installation
template on the wall.
2. Mark out the rawl plug holes.
3. Drill 7 10 mm holes and insert the
rawl plugs supplied.
4. Fit the wall mounting bracket with
the screws supplied.
Fitting the pre-plumbing jig or
mounting frame
Pre-plumbing jig or mounting
frame installation instructions
Preparing the connections
!Please note
To prevent appliance damage,
connect all pipework free of load
and torque stress.
1. Prepare the water connections.
Flush the heating system.
2. Prepare the gas connection.
3. Prepare the electrical connections.
■ Cables for accessories:
Sheathed cable, 2-core. For low
voltage, min. 0.5 mm2.
Installation in a cupboard
Any cupboard enclosing the appliance
must be designed and constructed spe-
cifically for this purpose. An existing
cupboard or closet may be used, provi-
ded it is modified accordingly. BS
7698:2000 gives details of the essential
design features for cupboards and clos-
ets, including airing cupboards. The
Vitodens range does not require the
cupboard to be ventilated.
Preparing for installation
Preparing for installation (cont.)
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Removing the front panel and mounting the boiler
2x
1.
2.
3.
1. Undo the screws on the underside
of the boiler; do not remove them
completely.
2. Remove front panel.
3. Hook the boiler into the wall mount-
ing bracket.
Installation sequence
Mounting the boiler and making connections
5675991
Installation

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Fitting the connections on the water side
!Please note
Protect pressure gauge hoses
when welding/soldering copper
pipes to the boiler.
A
¨
zz
B C D
AHeating flow G ¾
BDHW G ½
CCold water G ½
DHeating return G ¾
1. Mount the fittings with gaskets. 2. Install the filling equipment on site.
The filling equipment must comply
with the Fittings Directive G24.2a.
Installation sequence
Mounting the boiler and making connections (cont.)
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Gas connection
A
¨
zz
1. Fit the gas shut-off valve with bend
to connection A.
2. Connect the gas supply to connec-
tion A.
3. Carry out a tightness test.
Note
Only use suitable and approved
leak detection agents (EN 14291)
and devices for the tightness test.
Leak detection agents with unsuita-
ble constituents (e.g. nitrides, sul-
phides) can cause material dam-
age.
Remove residues of the leak detec-
tion agent after testing.
Installation sequence
Mounting the boiler and making connections (cont.)
5675991
Installation

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!Please note
Excessive test pressure will
damage the boiler and the
gas train.
Max. test pressure 150 mbar
(15 kPa). Where higher
pressure is required for
tightness tests, disconnect
the boiler and the gas train
from the main supply pipe
(undo the fitting).
4. Purge the gas line.
Connecting the safety valve and condensate drain
A
■ The condensate pipe is connected to
the discharge pipe of the safety
valve. The condensate hose supplied
meets the temperature requirements
that are part of the CE certification.
■ We recommend connecting the con-
densate pipe to the internal domestic
waste water system, either directly or
via a tundish.
■ If the condensate pipe is routed out-
side the building, use a pipe with min.
7 30 mm and protect the pipe from
frost. Avoid long external pipe runs.
Install a tundish.
!Please note
A frozen condensate pipe can
result in faults and damage to
the boiler.
Always protect condensate
pipes against frost.
■ Observe local building regulations.
Connect condensate pipe A to the
public sewage system with a constant
fall and a pipe vent.
Observe local waste water regulations.
Note
Fill the trap with water before commis-
sioning.
Installation sequence
Mounting the boiler and making connections (cont.)
5675991