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 38, 47 819 39
VITODENS 050-W
5675991 GB 8/2020 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 pollu-
tion.
Note
Details identified by the
word "Note" contain addi-
tional information.
Target group
These instructions are
exclusively intended for
qualified contractors.
■Work on gas installations
may only be carried out
by a registered gas fitter.
■Work on electrical equip-
ment may only be car-
ried out by a qualified
electrician.
■The system must be
commissioned by the
system installer or a
qualified person author-
ised by the installer.
Safety instructions
Safety instructions
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3
Regulations to be observed
■National installation reg-
ulations
■Statutory regulations for
the prevention of acci-
dents
■Statutory regulations for
environmental protection
■Codes of practice of the
relevant trade associa-
tions
■Relevant country-spe-
cific safety regulations
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
safeguard it against
unintentional reopening.
■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 reconnection.
■Wear suitable personal
protective equipment
when carrying out any
work.
Safety instructions
Safety instructions (cont.)
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Danger
Hot surfaces and flu-
ids can lead to burns
or scalding.
■Before maintenance
and service 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 assem-
blies can be dam-
aged by electrostatic
discharge.
Prior to commencing
work, touch earthed
objects such as heat-
ing or water pipes to
discharge static
loads.
Repair work
!Please note
Repairing compo-
nents that fulfil a
safety function can
compromise the safe
operation of the sys-
tem.
Replace faulty com-
ponents only with
genuine Viessmann
spare parts.
Safety instructions
Safety instructions (cont.)
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5
Auxiliary components,
spare and wearing parts
!Please note
Spare and wearing
parts that have not
been tested together
with the system can
compromise its func-
tion. Installing non-
authorised compo-
nents and making
non-approved modifi-
cations or conver-
sions can compro-
mise safety and may
invalidate our war-
ranty.
For replacements,
use only original
spare parts supplied
or approved by
Viessmann.
Safety instructions
Safety instructions (cont.)
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6
Safety instructions for operating the system
If you smell gas
Danger
Escaping gas can
lead to explosions
which may result in
serious injury.
■Do not smoke. Pre-
vent naked flames
and sparks. Never
switch lights or elec-
trical appliances on
or off.
■Close the gas shut-
off valve.
■Open windows and
doors.
■Evacuate any peo-
ple from the danger
zone.
■Notify your gas or
electricity supply
utility from outside
the building.
■Have the power
supply to the build-
ing shut off from a
safe place (outside
the building).
If you smell flue gas
Danger
Flue gas can lead to
life threatening poi-
soning.
■Shut down the heat-
ing system.
■Ventilate the instal-
lation site.
■Close doors to living
spaces to prevent
flue gases from
spreading.
What to do if water
escapes from the appli-
ance
Danger
If water escapes from
the appliance there is
a risk of electrocu-
tion.
Switch OFF the heat-
ing system at the
external isolator (e.g.
fuse box, domestic
distribution board).
Safety instructions
Safety instructions (cont.)
5675991

7
Danger
If water escapes from
the appliance there is
a risk of scalding.
Never touch hot heat-
ing water.
Condensate
Danger
Contact with conden-
sate can be harmful
to health.
Never let condensate
touch your skin or
eyes and do not
swallow it.
Flue systems and com-
bustion air
Ensure that flue systems
are clear and cannot be
sealed, for instance due to
accumulation of conden-
sate or other external cau-
ses.
Ensure an adequate sup-
ply of combustion air.
Inform system users that
subsequent modifications
to the building characteris-
tics are not permissible
(e.g. cable/pipework rout-
ing, cladding or partitions).
Danger
Leaking or blocked
flue systems, or an
inadequate supply of
combustion air can
cause life threatening
poisoning from car-
bon monoxide in the
flue gas.
Ensure the flue sys-
tem is in good work-
ing order. Vents for
supplying combustion
air must be non-seal-
able.
Safety instructions
Safety instructions (cont.)
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8
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 poi-
soning due to a
reverse flow of flue
gas.
Fit an interlock circuit
or take suitable steps
to ensure an ade-
quate supply of com-
bustion air.
Safety instructions
Safety instructions (cont.)
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Installation instructions
Information
Disposal of packaging.......................................................................................... 11
Symbols................................................................................................................ 12
Intended use......................................................................................................... 13
Product information.............................................................................................. 13
Spare parts lists.................................................................................................... 14
Preparing for installation................................................................................... 15
Installation sequence
Mounting the boiler and making connections....................................................... 20
Opening the programming unit............................................................................. 25
Electrical connections........................................................................................... 26
Service instructions
Commissioning, inspection, maintenance
Steps - commissioning, inspection and maintenance.......................................... 30
Further details regarding the individual steps....................................................... 31
Troubleshooting
Function sequence and possible faults................................................................ 55
Fault display......................................................................................................... 56
Repairs................................................................................................................. 61
Changing the gas type
Converting from LPG to natural gas..................................................................... 73
Control unit
Functions and operating conditions in weather-compensated mode................... 75
Designs
Connection and wiring diagrams.......................................................................... 77
Specification....................................................................................................... 82
Disposal
Final decommissioning and disposal.................................................................... 83
Certificates
Declaration of conformity...................................................................................... 84
Index
Index
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Keyword index.................................................................................................... 85
Index
Index (cont.)
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11
Please dispose of packaging waste in
line with statutory regulations.
Information
Disposal of packaging
5675991
Installation

12
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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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 38
■ 35 kW combi: 47 819 39
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 19 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
5675991
Installation

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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.
Spare parts lists
Information about spare parts can be
found at www.viessmann.com/etapp
or in the Viessmann spare part app.
Information
Product information (cont.)
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Siting
Suitable siting locations include:
■ Recreational rooms and other living
spaces
■ Unventilated ancillary rooms
■ Cabinets (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), maintaining
clearances towards combustible com-
ponents is not required. For further
details, see the technical guide on flue
systems for the Vitodens.
The installation room must be free from
the risk of frost.
Operation of the Vitodens 050-W in wet rooms
Area 0
Area 1
Area
2
Area 2
600
2250
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 Vito-
dens may be installed in safety zone 1
if hosed water (e.g. from massage
showers) is prevented.
Preparing for installation
Preparing for installation
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Installation

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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 shock
currents.
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.
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 (cont.)
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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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Installation

18
Fitting the wall mounting bracket
250
A
Ø10
145
AVitodens installation template
Preparing for installation
Preparing for installation (cont.)
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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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Installation

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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