Viessmann Vitodens 242-F Quick guide

Installation and service instructions
for contractors
VIESMANN
Vitodens 242-F
Type B2UA, 3.2 to 26 kW
Gas/solar condensing storage combi boiler
Gas Council No.
41-819-18; 41-819-19
Natural gas and LPG versions
For applicability, see the last page
VITODENS 242-F
5773 238 GB 10/2015 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 pollution.
Note
Details identified by the word "Note" contain additional
information.
Target group
These instructions are exclusively intended for quali-
fied 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 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 prevention of accidents
■Statutory regulations for environmental 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-TR Gas, ÖVGW-TRF and
ÖVE
cSEV, SUVA, SVGW, SVTI, SWKI, VKF and
EKAS guideline 1942: LPG, part 2
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.
Danger
Hot surfaces can cause burns.
■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 assemblies can be damaged by elec-
trostatic discharge.
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 func-
tion can compromise 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 tes-
ted together with the system can compromise its
function. Installing non-authorised components
and making non-approved modifications or con-
versions can compromise safety and may inva-
lidate our warranty.
For replacements, use only original spare parts
supplied or approved by Viessmann.
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. 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 threatening poisoning.
■Shut down the heating system.
■Ventilate the installation site.
■Close doors to living spaces to prevent flue
gases from spreading.
Safety instructions
Safety instructions
5773 238 GB

3
What to do if water escapes from the appliance
Danger
When water escapes from the appliance there is
a risk of electrocution.
Switch off the heating system at the external iso-
lator (e.g. fuse box, domestic power distribu-
tion).
Flue systems and combustion air
Ensure that flue systems are clear and cannot be
sealed, for instance due to accumulation of conden-
sate or other causes. Ensure an adequate supply of
combustion air.
Instruct system users that subsequent modifications to
the building characteristics are not permissible (e.g.
cable/pipework routing, cladding or partitions).
Danger
Leaking or blocked flue systems, or an inade-
quate supply of combustion air can cause life
threatening poisoning from carbon monoxide in
the flue gas.
Ensure the flue system is in good working order.
Vents for supplying combustion air must be non-
closable.
Extractors
Operating appliances that extract air to the outside
(cooker hoods, extractors, air conditioning units, etc.)
can create negative 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 poisoning due to
reverse flow of the flue gas.
Fit an interlock circuit or take suitable steps to
ensure an adequate supply of combustion air.
Safety instructions
Safety instructions (cont.)
5773 238 GB

4
1. Information Disposal of packaging ............................................................................ 7
Symbols ................................................................................................. 7
Intended use .......................................................................................... 7
Maintenance and cleaning ..................................................................... 8
2. Preparing for installation Product information ................................................................................ 9
■Vitodens 242-F, type B2UA ................................................................. 9
Installation preparations ......................................................................... 9
■Handling ............................................................................................. 9
■Dividing the boiler into sections .......................................................... 10
■Siting ................................................................................................... 17
■Preparing for boiler installation ........................................................... 17
3. Installation sequence Installing the boiler ................................................................................. 21
■Removing the front panels .................................................................. 21
■Siting and levelling the boiler .............................................................. 22
■Connections on the heating water and DHW side .............................. 23
■Connections on the solar side ............................................................ 24
■Condensate connection ...................................................................... 25
■Flue outlet ........................................................................................... 25
■Gas connection ................................................................................... 26
Opening the control unit enclosure ........................................................ 27
Electrical connections ............................................................................ 27
■Outside temperature sensor ! .......................................................... 29
■Connecting the collector temperature sensor ..................................... 29
■External demand via switching contact .............................................. 29
■External demand via 0 – 10 V input .................................................... 30
■External blocking via switching contact .............................................. 30
■Power supply for accessories at plug lH (230 V~) ............................. 31
■Power supply fÖ ................................................................................. 32
■Routing the connecting cables and leads ........................................... 33
Closing the control unit enclosure .......................................................... 34
Fitting the front panels ........................................................................... 35
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 36
5. Code 1 "General" .............................................................................................. 68
■Coding ................................................................................................ 68
"Boiler" ................................................................................................. 69
■Coding ................................................................................................ 70
"DHW" ................................................................................................... 70
■Coding ................................................................................................ 70
"Solar" .................................................................................................. 70
■Coding ................................................................................................ 71
"Heating circuit ..." .............................................................................. 71
■Coding ................................................................................................ 71
6. Code 2 "General" .............................................................................................. 75
■Coding ................................................................................................ 75
"Boiler" ................................................................................................. 80
■Coding ................................................................................................ 80
"DHW" ................................................................................................... 81
■Coding ................................................................................................ 81
"Solar" .................................................................................................. 82
■Coding ................................................................................................ 82
"Heating circuit ..." .............................................................................. 83
■Coding ................................................................................................ 83
Index
Index
5773 238 GB

5
7. Diagnosis and service
scans
Service menu ......................................................................................... 89
■Calling up the service menu ............................................................... 89
■Exiting the service menu .................................................................... 89
Diagnosis ............................................................................................... 89
■Calling up operating data .................................................................... 89
■Brief scan ............................................................................................ 90
Checking outputs (actuator test) ............................................................ 91
8. Troubleshooting Fault display ........................................................................................... 93
Fault codes ............................................................................................ 93
Maintenance .......................................................................................... 100
■Putting the control unit into the service position ................................. 100
■Draining the boiler on the heating water side ..................................... 101
■Checking the outside temperature sensor ..........................................101
■Checking the boiler temperature sensor, cylinder temperature sen-
sor or flow temperature sensor for low loss header ............................103
■Checking the collector temperature sensor or cylinder temperature
sensor on the solar control module .................................................... 104
■Checking the outlet temperature sensor .............................................105
■Checking the plate heat exchanger .................................................... 105
■Checking the flue gas temperature sensor .........................................106
■Checking the temperature limiter ........................................................107
■Checking the fuse/MCB ......................................................................109
■Checking the solar control module fuse ............................................. 109
■Mixer extension kit ..............................................................................109
■Checking the Vitotronic 200-H (accessories) ...................................... 111
9. Function description Control unit ............................................................................................ 112
■Heating mode ..................................................................................... 112
■Heating the DHW loading cylinder from cold ...................................... 112
■Reheating when DHW is drawn off ..................................................... 112
■DHW heating via solar collectors ........................................................ 113
■Boosting DHW heating ....................................................................... 113
Internal extensions (accessories) .......................................................... 113
■Internal extension H1 .......................................................................... 113
■Internal extension H2 .......................................................................... 114
External extensions (accessories) ......................................................... 115
■AM1 extension .................................................................................... 115
■EA1 extension .................................................................................... 116
Control functions .................................................................................... 118
■External operating program changeover ............................................ 118
■External blocking ................................................................................ 118
■External demand ................................................................................ 119
■Venting program ................................................................................. 119
■Fill program ......................................................................................... 119
■Screed drying ..................................................................................... 119
■Raising the reduced room temperature .............................................. 121
■Reducing the heat-up time ................................................................. 122
Allocating heating circuits to the remote control .................................... 123
Electronic combustion control unit ......................................................... 124
10. Designs Internal connection diagram .................................................................. 125
External connection diagram ................................................................. 126
Connection diagram, solar control module ............................................ 127
11. Parts lists Ordering parts ........................................................................................128
Overview of assemblies .........................................................................129
Casing assembly ................................................................................... 130
Hydraulic assembly ................................................................................132
Cylinder module assembly .....................................................................136
Index
Index
5773 238 GB

6
Loading cylinder assembly .................................................................... 138
Heat cell assembly .................................................................................140
MatriX cylinder burner assembly ........................................................... 142
Control unit assembly ............................................................................ 144
Miscellaneous ........................................................................................ 146
12. Commissioning/service
reports
................................................................................................................148
13. Specification ................................................................................................................149
14. Certificates Declaration of conformity ....................................................................... 150
Manufacturer's certificate according to the 1st BImSchV [Germany] .... 150
15. Keyword index ................................................................................................................151
Index
Index (cont.)
5773 238 GB

7
Please dispose of packaging waste in line with statu-
tory regulations.
DE: Use the disposal system organised 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.
Symbols
Symbol 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 environ-
mental 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 sur-
face.
Dispose of component correctly.
Dispose of component at a suitable collec-
tion point. Do not dispose of component in
domestic waste.
The steps in connection with commissioning, inspec-
tion and maintenance are found in the "Commission-
ing, inspection and maintenance" section and identified
as follows:
Symbol Meaning
Steps required during commissioning
Not required during commissioning
Steps required during inspection
Not required during inspection
Steps required during maintenance
Not required during maintenance
Intended use
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 instruc-
tions. 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 permissible, system-specific compo-
nents has been carried out.
Information
Disposal of packaging
5773 238 GB
Information

8
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 man-
ufacturer 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 liability. 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).
Maintenance and cleaning
Danger
During maintenance and cleaning, combustion
residues pose a danger to the respiratory tract.
Wear a dust mask to protect your respiratory
tract.
Note
Observe the country-specific regulations on the dis-
posal of any materials and waste.
Note
Before restarting the heating system, return any
removed components and cables to their original posi-
tion and secure them.
Information
Intended use (cont.)
5773 238 GB
Information

9
Vitodens 242-F, type B2UA
Preset for operation with natural gas E and
natural gas LL.
For conversion to LPG P (without conversion kit), see
page 44.
The Vitodens 242-F may only be delivered to countries
listed on the type plate. For deliveries to other coun-
tries, approved contractors must arrange individual
approval on their own initiative and in accordance with
the law of the country in question.
Installation preparations
Handling
If possible, leave the boiler on the pallet during han-
dling.
If space constraints make it necessary, the boiler can
be split for handling.
!Please note
Prevent damage to the appliance during han-
dling.
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

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

11
8.
9.
4x
8x
12.
10.
11.
Fig. 2
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation

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13.
14.
15.
Fig. 3
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation

13
16.
Fig. 4
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation

14
sF
%
%
17.
19.
21.
20.
18.
Fig. 5
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation

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24.
22.
23.
Fig. 6
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation

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27.
26.
25.
Fig. 7
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation

17
28.
2x
2x
29.
30.
Fig. 8
Siting
Required room height: at least 2100 mm
Preparing for boiler installation
A connection set, available as an accessory, must be
used to make the connections 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 appliance damage.
Connect all pipework free of load and torque
stress.
Preparing the connections on site:
Connection set installation instructions
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation

18
The following overview shows sample connection sets
for installation on finished 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
Fig. 9
440
55
220
330
a
50
595
50
600
C
F
D
A
B
E
G
H
Fig. 10
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.
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation

19
1. Prepare the heating water connections.
Thoroughly flush the heating system.
Note
Should an additional expansion vessel be required
on site, connect this vessel in the heating return.
2. Prepare the connections on the DHW side. Install
the safety assembly (accessory or on-site provi-
sion) 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
temperatures.
Note
Never connect the safety valve drain line to hose
N. Never change the position of hose N (used for
ventilation).
3. Prepare the solar connections.
>200
O
N
Fig. 11
NSiphon ventilation
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 diagram on page 18.
■Drain towards the side aperture:
See position L in diagram on page 18.
5. Prepare the gas connection according to TRGI or
TRF [or local regulations].
6. Prepare the electrical connections.
■Power cable: NYM-J 3 x 1.5 mm2, max. fuse rat-
ing 16 A, 230 V/50 Hz.
■Accessory cables: NYM with the required number
of cores for external connections.
■Allow all cables in area M in the diagram on
page 18 to protrude 2000 mm from the wall.
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation

20
Safety assembly to DIN 1988 and EN 806 on the cold water connection
C
F
B
D E GH D
K
D H L M D N K
A
O
Fig. 12
ASafety assembly (accessory for connection sets for
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 connection set (accesso-
ries)
Preparing for installation
Installation preparations (cont.)
5773 238 GB
Installation