Viessmann Vitodens 242-F Quick guide

Installation and service
instructions
for contractors
VIESMANN
Vitodens 242-F
Type B2UA, 3.2 to 26 kW
Gas condensing/solar storage combi boiler
Gas council no.
41-819-18; 41-819-19
Natural gas and LPG version
For applicability, see the last page
VITODENS 242-F
5773 238 GB 4/2013 Please keep safe.

2
Please follow these safety instructions closely to prevent accidents and mate-
rial 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" con-
tain additional information.
Target group
These instructions are exclusively inten-
ded for qualified contractors.
■ Work on gas installations must only be
carried out by a registered gas fitter.
■ 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 working on
this system:
■ Statutory regulations regarding the
prevention of accidents
■ Statutory regulations regarding envi-
ronmental 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
■ Gas Safety (Installation & Use) Regu-
lations
– the appropriate Building Regulation
either the Building regulations, the
Building Regulation (Scotland), Build-
ing Regulations (Northern Ireland),
– the Water Fittings Regulation or
Water Bylaws in Scotland,
– the current I.E.E. Wiring Regula-
tions.
If you smell gas
Danger
Escaping gas can lead to explo-
sions which may result in serious
injury.
■ Do not smoke. Prevent naked
flames and sparks. Do not
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.
■ Shut off the electricity supply to
the building from a safe place
(outside the building).
Safety instructions
Safety instructions
5773 238 GB

3
If you smell flue gas
Danger
Flue gas can lead to life-threat-
ening poisoning.
■ Shut down the heating system.
■ Ventilate the installation site.
■ Close all doors in the living
space.
Flue systems and combustion air
Ensure that flue systems are clear and
cannot be sealed, for instance due to
accumulation of condensate or other
causes. Ensure a sufficient supply of
combustion air.
Instruct system users that subsequent
modifications to the building characteris-
tics are not permissible (e.g. cable/pipe-
work routing, cladding or partitions).
Danger
Life-threatening poisoning
caused by carbon monoxide in
the flue gas occurs as a result of
leaking or blocked flue systems
or an insufficient supply of com-
bustion air.
Ensure the flue system is in
proper working order. It must not
be possible to close apertures for
interconnected combustion air
supply.
Extractors
Operating appliances that extract air to
the outside (cooker hoods, extractors, air
conditioning units, etc.) can create neg-
ative pressure. If the boiler is operated at
the same time, this can lead to reverse
flow of the flue gas.
Danger
The simultaneous operation of
the boiler and appliances that
extract air to the outside can
result in life threatening poison-
ing due to reverse flow of the flue
gas.
Fit an interlock circuit or take suit-
able steps to ensure a sufficient
supply of combustion air.
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 sup-
ply (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.
!Please note
Electronic assemblies can be
damaged by electrostatic dis-
charge.
Prior to commencing any 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 compromise
the safe operation of your sys-
tem.
Defective components must be
replaced with genuine
Viessmann spare parts.
Safety instructions
Safety instructions (cont.)
5773 238 GB

4
Auxiliary components, spare and
wearing parts
!Please note
Spare and wearing parts that
have not been tested together
with the system can compromise
its function. Installing non-author-
ised components and making
non-approved modifications or
conversions can compromise
safety and may invalidate our
warranty.
For replacements, use only orig-
inal spare parts supplied or
approved by Viessmann.
Safety instructions
Safety instructions (cont.)
5773 238 GB

5
Installation instructions
Preparing for installation
Product information.............................................................................................. 7
Preparing the installation...................................................................................... 7
Installation sequence
Installing the boiler............................................................................................... 21
Opening the control unit casing............................................................................ 29
Electrical connections........................................................................................... 30
Closing the control unit casing............................................................................. 39
Fitting the front panels.......................................................................................... 41
Service instructions
Commissioning, inspection, maintenance
Steps - commissioning, inspection and maintenance.......................................... 42
Further details regarding the individual steps....................................................... 45
Code 1
Calling up coding level 1...................................................................................... 85
"General".............................................................................................................. 85
"Boiler" ................................................................................................................. 88
"DHW".................................................................................................................. 89
"Solar".................................................................................................................. 89
"Heating circuit ..."................................................................................................ 90
Code 2
Calling up coding level 2...................................................................................... 97
"General".............................................................................................................. 97
"Boiler".................................................................................................................. 105
"DHW".................................................................................................................. 106
"Solar".................................................................................................................. 108
"Heating circuit ..."................................................................................................ 110
Diagnosis and service scans
Service menu....................................................................................................... 119
Diagnosis.............................................................................................................. 120
Checking outputs (actuator test).......................................................................... 123
Troubleshooting
Fault display......................................................................................................... 124
Fault codes........................................................................................................... 125
Repair................................................................................................................... 137
Index
Index
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Function description
Control unit........................................................................................................... 151
Internal extensions (accessories)......................................................................... 153
External extensions (accessories)........................................................................ 156
Control functions.................................................................................................. 160
Allocating heating circuits to the remote control................................................... 168
Electronic combustion control unit........................................................................ 168
Designs
Internal connection diagram................................................................................. 170
External connection diagram................................................................................ 171
Connection diagram, solar control module........................................................... 173
Parts lists
Ordering individual parts...................................................................................... 174
Overview of the assemblies................................................................................. 175
Casing.................................................................................................................. 176
Hydraulics............................................................................................................. 178
Cylinder module................................................................................................... 181
Heat cell............................................................................................................... 186
Control unit........................................................................................................... 189
Miscellaneous....................................................................................................... 191
Commissioning/service reports........................................................................ 193
Specification....................................................................................................... 194
Certificates
Declaration of conformity...................................................................................... 195
Manufacturer's certificate according to the 1st BImSchV [Germany]................... 196
Keyword index.................................................................................................... 197
Index
Index (cont.)
5773 238 GB

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Vitodens 242-F, type B2UA
Preset for operation with natural gas E
and natural gas LL.
For conversion to LPG P (without con-
version kit), see page 53.
In principle the Vitodens 242-F may only
be delivered to countries listed on the
type plate. For deliveries to alternative
countries, an approved contractor must
arrange individual approval on his own
initiative and in accordance with the law
of the country in question.
Intended use
The appliance is only intended to be
installed and operated in sealed unven-
ted heating systems that comply with
EN 12828, with due attention paid to the
associated installation, service and
operating instructions. It is only designed
for the heating of water that is of potable
water quality.
Intended usage presupposes that a fixed
installation in conjunction with permissi-
ble, system-specific components has
been carried out.
Commercial or industrial usage for a pur-
pose other than heating the building or
DHW does not comply with regulations.
Any usage beyond this must be
approved by the manufacturer for the
individual case.
Incorrect usage or operation of the appli-
ance (e.g. the appliance being opened
by the system user) is prohibited and
results in an exclusion of liability. Incor-
rect usage also occurs if the components
in the heating system are modified from
their intended function (e.g. if the flue
gas and ventilation air paths are
sealed).
Preparing the installation
Handling
If possible, leave the boiler on the pallet
during handling.
If space constraints make it necessary,
the boiler can be split for handling.
!Please note
Prevent damage to the appliance
during handling.
Never set the boiler down on its
front or sides, or apply any load
to these surfaces.
Preparing for installation
Product information
5773 238 GB
Installation

8
Dividing the boiler into sections
6.
7.
3.
5.
2.
1.
4. 2x
Preparing for installation
Preparing the installation (cont.)
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8.
9.
4x
8x
12.
10.
11.
Preparing for installation
Preparing the installation (cont.)
5773 238 GB
Installation

10
13.
14.
15.
Preparing for installation
Preparing the installation (cont.)
5773 238 GB

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16.
Preparing for installation
Preparing the installation (cont.)
5773 238 GB
Installation

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sF
%
%
17.
19.
21.
20.
18.
Preparing for installation
Preparing the installation (cont.)
5773 238 GB

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24.
22.
23.
Preparing for installation
Preparing the installation (cont.)
5773 238 GB
Installation

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27.
26.
25.
Preparing for installation
Preparing the installation (cont.)
5773 238 GB

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28.
2x
2x
29.
30.
Preparing for installation
Preparing the installation (cont.)
5773 238 GB
Installation

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Siting
Required room height: at least 2100 mm
Preparing for boiler installation
Use a connection set, available as an
accessory, to make the connection on
the gas and water sides.
Fitting accessories
Fit all accessories that are installed at
the back of the boiler (e.g. connection
sets).
!Please note
Avoid device damage.
Connect all pipework free of load
and torque stress.
Preparing the connections on site:
Connection set installation
instructions.
Preparing for installation
Preparing the installation (cont.)
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The following overview shows sample
connection sets for installation on fin-
ished walls, with connection to the top or
side.
65
1930
2008
100
719
46
40
50
1367
1422
1477
1532
1587
1642
1697
1752
1807
1875
1900
1135 1100
140
60
320
370
436
449
A
H
AH
B
D
F
E
G
C
G
E
C
B
F
D
M
K
K
L
Preparing for installation
Preparing the installation (cont.)
5773 238 GB
Installation

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440
55
220
330
a
50
595
50
600
C
F
D
A
B
E
G
H
ASolar return R¾
BHeating flow R¾
CDHW R½
DGas connection R½
EDHW circulation R½ (separate
accessory)
FCold water R½
GHeating return R¾
HSolar flow R¾
KCondensate drain facing backwards
into the wall
LCondensate drain to the side
MWiring area
Rated heating output range 3.2 to 19 kW 6.5 to 26 kW
a (mm) 201 224
Note
All height dimensions have a tolerance
of +15 mm due to the adjustable feet.
1. Prepare the heating water connec-
tions.
Thoroughly flush the heating sys-
tem.
Note
Should an additional expansion ves-
sel be required on site, connect this
vessel in the heating return.
Preparing for installation
Preparing the installation (cont.)
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2. Prepare the connections on the DHW
side. Install the safety assembly
(accessory or on-site provision) in the
cold water line in accordance with
DIN 1988 and EN 806 (see
page 20).
Recommendation:
Install the safety valve above the
DHW cylinder to protect it against
contamination, scaling and high tem-
peratures.
3. Prepare the solar connections.
>200
O
N
NDrain for DHW safety valve and/or
siphon air vent valve
OCondensate drain hose
4. Prepare the condensate connection
to the on-site drain line or siphon:
■ Drain towards the back:
See dimensions for condensate
hose O and position K in the dia-
gram on page 17.
■ Drain towards the side aperture:
See position L in diagram on
page 17.
5. Prepare the gas connection accord-
ing to TRGI or TRF [or local regula-
tions].
6. Prepare the electrical connections.
■Power cable: NYM-J 3 x 1.5 mm2,
max. fuse rating 16 A,
230 V/50 Hz.
■ Accessory cables: NYM with the
required number of cores for the
external connections.
■Allow all cables in area M in the
diagram on page 18 to protrude
2000 mm from the wall.
Preparing for installation
Preparing the installation (cont.)
5773 238 GB
Installation

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Safety assembly in accordance with DIN 1988 and EN 806 to the cold water
connection
ASafety assembly (accessory for the
connection sets on unfinished
walls)
BSafety valve
CVisible discharge pipe outlet point
DShut-off valve
EFlow regulating valve (installation
recommended)
FPressure gauge connection
GNon-return valve
HDrain
KCold water
LDrinking water filter
MPressure reducer to DIN 1988-2,
Dec. 1988 issue
NNon-return valve/pipe separator
OCold water connection at connec-
tion set (accessories)
Preparing for installation
Preparing the installation (cont.)
5773 238 GB