Viessmann Vitodens 222-F Quick guide

Installation and service instructions
for contractors
VIESMANN
Vitodens 222-F
Type B2TB, 1.8 to 35.0 kW
Gas condensing storage combi boiler
Natural gas and LPG version
For applicability, see the last page
VITODENS 222-F
5789330 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 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 may only be carried out by
a registered gas fitter.
■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 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 G K directives,
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.
■Wear suitable personal protective equipment when
carrying out any work.
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.
Safety instructions
Safety instructions
5789330

3
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.
What to do if water escapes from the appliance
Danger
If water escapes from the appliance there is a
risk of electrocution.
Switch OFF the heating system at the external
isolator (e.g. fuse box, domestic distribution
board).
Danger
If water escapes from the appliance 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 conden-
sate or other external causes.
Avoid continuous condensate disposal with a wind pro-
tector.
Ensure an adequate supply of combustion air.
Inform 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-
sealable.
Extractors
Operating appliances that exhaust air to the outside
(extractor hoods, extractors, 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 poisoning due to a
reverse flow of flue gas.
Fit an interlock circuit or take suitable steps to
ensure an adequate supply of combustion air.
Safety instructions
Safety instructions (cont.)
5789330

4
1. Information Disposal of packaging ............................................................................ 6
Symbols ................................................................................................. 6
Intended use .......................................................................................... 7
Product information ................................................................................ 7
■Vitodens 222-F, type B2TB ................................................................. 7
2. Preparing for installation Preparing for boiler installation .............................................................. 8
Safety assembly to DIN 1988 and EN 806 on the cold water connec-
tion ......................................................................................................... 10
3. Installing the boiler Removing the front panels ..................................................................... 11
Siting and levelling the boiler ................................................................. 12
■Fitting the additional type plate ........................................................... 12
Connections on the heating water and DHW side ................................. 13
■Connection on the DHW side ............................................................. 13
Condensate connection ......................................................................... 13
Flue gas connection ............................................................................... 14
Gas connection ...................................................................................... 15
Opening the control unit enclosure ........................................................ 16
Electrical connections ............................................................................ 16
■External demand via switching contact .............................................. 18
■External demand via 0 – 10 V input .................................................... 18
■External blocking via switching contact .............................................. 19
■Power supply for accessories at plug lH (230 V ~) ............................ 20
■Power supply fÖ ................................................................................. 21
■Routing connecting cables ................................................................. 22
Closing the control unit enclosure .......................................................... 23
Fitting the front panels ........................................................................... 24
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 25
5. Code 1 Calling up coding level 1 ........................................................................ 48
"General"/Group 1 ................................................................................ 48
■Coding ................................................................................................ 48
"Boiler"/Group 2 ................................................................................... 49
■Coding ................................................................................................ 49
"DHW"/Group 3 ..................................................................................... 50
■Coding ................................................................................................ 50
"Heating circuit ..."/Group 5 ................................................................ 50
■Coding ................................................................................................ 50
6. Code 2 Calling up coding level 2 ........................................................................ 52
"General"/Group 1 ................................................................................ 52
■Coding ................................................................................................ 52
"Boiler"/Group 2 ................................................................................... 56
■Coding ................................................................................................ 56
"DHW"/Group 3 ..................................................................................... 57
■Coding ................................................................................................ 57
"Heating circuit ..."/Group 5 ................................................................ 58
■Coding ................................................................................................ 58
7. Diagnosis and service
scans
Service menu ......................................................................................... 61
■Calling up the service menu ............................................................... 61
■Exiting the service menu .................................................................... 61
Diagnosis ............................................................................................... 61
■Operating data .................................................................................... 61
■Brief scan ............................................................................................ 61
■Checking outputs (actuator test) ......................................................... 62
Index
Index
5789330

5
8. Troubleshooting Fault display ........................................................................................... 64
Fault codes ............................................................................................ 64
Maintenance .......................................................................................... 74
■Putting the control unit into the service position ................................. 74
■Draining the boiler on the heating water side ..................................... 75
■Checking the boiler water temperature sensor, cylinder temperature
sensor or flow temperature sensor of low loss header ....................... 76
■Checking the outlet temperature sensor ............................................. 77
■Checking the plate heat exchanger .................................................... 78
■Checking the flue gas temperature sensor ......................................... 78
■Checking the temperature limiter ........................................................ 79
■Checking the fuse ............................................................................... 80
9. Parts lists Overview of assemblies ......................................................................... 81
■Ordering parts ..................................................................................... 81
Casing .................................................................................................... 82
Hydraulics .............................................................................................. 84
Hydraulic block ...................................................................................... 88
Loading cylinder ..................................................................................... 90
Heat cell ................................................................................................. 92
MatriX cylinder burner ............................................................................ 94
Control unit ............................................................................................ 96
Miscellaneous ........................................................................................ 98
Ordering individual parts for accessories ...............................................100
10. Function description ................................................................................................................101
■Heating mode ..................................................................................... 101
■DHW heating ...................................................................................... 101
Internal extensions .................................................................................102
■Internal H1 extension ..........................................................................102
■Internal H2 extension ..........................................................................103
External extensions (accessories) ......................................................... 104
■AM1 extension ....................................................................................104
■EA1 extension .................................................................................... 105
Control functions ....................................................................................106
■External operating program changeover ............................................ 106
■External blocking ................................................................................ 107
■External demand ................................................................................ 107
■Venting program ................................................................................. 107
■Filling program ....................................................................................108
Electronic combustion control unit ......................................................... 108
11. Connection and wiring dia-
gram
Connection and wiring diagram – internal connections ......................... 109
Connection and wiring diagram – external connections ........................ 110
12. Commissioning/service
reports
................................................................................................................ 112
13. Specification Specification .......................................................................................... 113
14. Certificates Declaration of conformity ....................................................................... 116
Manufacturer's certificate according to the 1st BImSchV [Germany] .... 117
15. Keyword index ................................................................................................................ 118
Index
Index (cont.)
5789330

6
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
Symbol Meaning
Steps required during inspection
Not required during inspection
Steps required during maintenance
Not required during maintenance
Information
Disposal of packaging
5789330
Information

7
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.
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).
Product information
Vitodens 222-F, type B2TB
Gas condensing storage combi boiler with Inox-Radial
heat exchanger and the following integrated compo-
nents:
■Modulating MatriX cylinder burner for natural gas
and LPG
■Integral loading cylinder, capacity
–100 l (13 to 26 kW)
–130 l (35 kW)
■Hydraulics with 3-way diverter valve and variable
speed high efficiency circulation pump
■Vitotronic 100 for constant temperature operation
■Integral diaphragm expansion vessel (12 l capacity)
The selected gas category in the delivered condition
and the associated nominal gas pressure are given on
the boiler type plate. The type plate also shows the
other gas types and pressures with which the boiler
can be operated. A conversion within the stated natu-
ral gas groups is not required. For conversion to LPG
(without conversion kit), see "Commissioning, inspec-
tion and maintenance".
The Vitodens 222-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.
Information
Intended use
5789330
Information

8
Use a connection set or connection kit, 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).
Preparing connections on site:
Connection set installation instructions
or
Assembly kit installation instructions
Note
Fit safety equipment in accordance with the national
regulations.
!Please note
Avoid damaging the appliance.
Connect all pipework free of load and torque
stress.
The following diagram shows sample connection sets
for surface mounting, with connection to the top or
side.
100
569
46
40
50
c
d
e
f
g
h
k
l
m
n
p
a b
140
50
320
361
398
410
80
A
C
D
F
E
B
E
F
B
A
D
C
K
G
H
G
Ø 60,5+0,8
Ø 96-0,5
Fig. 1
q
50
595
50
600
55
220
330
G
C
A
B
F
D
E
Fig. 2
AHeating flow R ¾
BDHW R ½
CGas connection R ¾
DCold water R ½
EHeating return R ¾
FDHW circulation R ½ (separate accessory)
GCondensate drain facing backwards into the wall
HCondensate drain to the side
KWiring area
Rated heating
output
13 -
19 kW
26 kW 35 kW
a (mm) 745 745 945
b (mm) 750 750 950
c (mm) 972 972 1172
d (mm) 1027 1027 1227
e (mm) 1082 1082 1302
f (mm) 1137 1137 1337
g (mm) 1191 1191 1391
h (mm) 1247 1247 1447
k (mm) 1302 1302 1562
l (mm) 1437 1437 1637
m (mm) 1466 1466 1666
n (mm) 1465 1465 1665
p (mm) 1526 1526 1726
q (mm) 201 224 224
Note
All height dimensions have a tolerance of +7 mm on
account of the adjustable feet.
Preparing for installation
Preparing for boiler installation
5789330
Installation

9
1. Prepare the connections on the heating water side.
Thoroughly flush the heating system.
Note
If an on-site expansion vessel also has to be instal-
led: Install this expansion vessel in the heating
return, as the 3-way diverter valve is located in the
heating flow.
M
L
>200
N
Fig. 3
LTrap air vent valve
MCondensate drain hose
NCable retainer
2. Prepare the connections on the DHW side. Install
the safety assembly (accessories or on-site provi-
sion) in the cold water line to DIN 1988 and
EN 806. See the following chapter.
Recommendation:
Install the safety valve above the DHW cylinder to
protect it against contamination, scaling and high
temperatures.
c: According to W3 "Principles for creating pota-
ble water installations", safety valves must be
drained directly via a visible unrestricted drain or
via a short outlet line to the drain network.
3. Prepare the condensate connection to the on-site
waste water pipe or trap:
■Drain towards the back:
See dimensions for condensate hose M and
position G in the previous diagrams.
■Drain towards the side aperture:
See position H in the previous diagram.
Note
Do not connect the DHW cylinder safety valve to
hose L. Do not change the position of hose L
(used for ventilation).
Route the condensate hose with a U-bend. Con-
nect it with a fall to the on-site waste water pipe or
trap.
4. Prepare the gas connection according to TRGI or
TRF [or local regulations].
5. Prepare the electrical connections.
■The appliance is delivered fitted with an approx.
1.5 m long power cable. Route the cable out-
wards through the cable holder in area N. Max.
fuse rating 16 A, 230 V~, 50 Hz (for cable rout-
ing, see chapter "Electrical connections").
■Accessory cables: 0.75 mm² flexible cable with
required number of cores for external connec-
tions
Preparing for installation
Preparing for boiler installation (cont.)
5789330
Installation

10
Fig. 4
ASafety assembly (accessories 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 outlet
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)
A safety assembly A to DIN 1988 and EN 806 is
required if the mains water supply pressure exceeds
10 bar (1 MPa), and no DHW pressure reducing valve
is installed (to DIN 4753).
Only use a non-return valve or a combined shut-off
and non-return valve in conjunction with a safety valve.
If the safety valve is used, the cold water shut-off valve
on the boiler must not be shut off.
Remove the toggle on the cold water shut-off valve (if
installed) to prevent it being shut off manually.
Preparing for installation
Safety assembly to DIN 1988 and EN 806 on the cold water connection
5789330
Installation

11
1.
4.
2x
3.
2.
5.
Fig. 5
Installing the boiler
Removing the front panels
5789330
Installation

12
1.
2.
SW17
Fig. 6
Note
Position the appliance and accessories so that they
are flush with the wall.
Fitting the additional type plate
1. Take the additional type plate from the documenta-
tion supplied with the boiler.
2. In consultation with the system user, attach the
additional type plate to the outside of the appliance
in a position visible to the flue gas inspector.
Installing the boiler
Siting and levelling the boiler
5789330
Installation

13
A
B
D
E
E
D
B
A
A B D E
C
C
C
Fig. 7 Shown with connection sets for finished walls
(accessories)
AHeating flow R ¾
BDHW R ½
CDHW circulation R ½ (separate accessories)
DCold water R ½
EHeating return R ¾
Connection on the DHW side
The DHW expansion vessel, available as an acces-
sory, is installed in the cold water supply inside the
boiler.
Separate installation instructions
Condensate connection
M
L
>200
Fig. 8
1. Route condensate hose M to the back (drain in
wall G) or to side aperture H (see page 8).
Note
Pull the condensate hose far enough out of the
boiler so that no unnecessary bends are created
inside the boiler.
2. Route condensate hose M as a U-bend and con-
nect with a constant fall and a pipe vent to the pub-
lic sewage system or to a neutralising system.
If necessary, connect to an on-site trap. Ensure
this connection is secure.
Observe local waste water regulations.
Note
Do not connect the DHW cylinder safety valve to
hose L. Do not change the position of hose L
(used for ventilation).
Installing the boiler
Connections on the heating water and DHW side
5789330
Installation

14
■The condensate pipe is connected to the discharge
pipe of the safety valve. The condensate hose sup-
plied meets the temperature requirements that are
part of the CE certification.
■We recommend connecting the condensate pipe
internally to the domestic waste water system, either
directly or via a tundish.
■If the condensate pipe is routed outside the building,
use a pipe with min. 7 30 mm and protect the pipe
from frost. Avoid long external pipe runs.
!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.
Observe local waste water regulations.
Note
Fill the trap with water before commissioning.
Flue gas connection
Note
■The labels "System certificate" and "Skoberne GmbH
flue system" enclosed with the technical documenta-
tion may only be used in conjunction with the
Viessmann flue system made by Skoberne.
■During installation and positioning of the flue system,
observe Building Regulations Part L and BS 5440
[GB only].
Connecting the balanced flue pipe
Flue system installation instructions.
Connecting several Vitodens to a shared flue sys-
tem
If connecting several Vitodens to a shared flue system,
install a back draught safety device in each boiler.
■Multiple vertical connections:
Back draught safety device available as separate
accessory
■Flue gas cascade:
Back draught safety device in standard delivery for
the flue gas cascade (accessories)
Install the back draught safety device:
Back draught safety device installation instruc-
tions
Change control unit to operation with a shared flue
system:
■In the commissioning assistant, select the "Multiple
connections" setting under "Flue system"
or
■Set parameter/code 7E:1
Do not carry out commissioning until the following
conditions are met:
■Free passage through the flue gas pipes.
■Flue system with positive pressure is gas-tight.
■Inspection port covers checked for secure and tight
seating.
■Apertures for ensuring sufficient combustion air sup-
ply are open and cannot be closed off.
■Applicable regulations on installing and commission-
ing flue systems have been followed.
Danger
Leaking or blocked flue systems or an insuffi-
cient supply of combustion air cause life threat-
ening poisoning due to carbon monoxide in the
flue gas.
Ensure the flue system functions correctly. Aper-
tures for combustion air supply must not be able
to be closed off.
Prevent condensate drainage via a wind protec-
tor.
Installing the boiler
Condensate connection (cont.)
5789330
Installation

15
A
AA
Fig. 9
1. If the gas connection has not been fitted previ-
ously, seal gas shut-off valve A to the gas con-
nection.
Information on operation with LPG
Install an external safety solenoid valve if the boiler
is installed below ground level.
2. Danger
Escaping gas leads to a risk of explosion.
Check all gas connections for tightness.
Note
Only use suitable and approved leak detection
agents (EN 14291) and devices for the tightness
test. Leak detection agents with unsuitable constit-
uents (e.g. nitrides, sulphides) can cause material
damage.
Remove residues of the leak detection agent after
testing.
!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 tight-
ness tests, disconnect the boiler and the gas
train from the main supply pipe (undo the fit-
ting).
3. Purge the gas line.
Conversion to alternative gas types:
See "Commissioning, inspection and mainte-
nance".
Installing the boiler
Gas connection
5789330
Installation

16
2x
4x
4.
3.
5.
2.
1.
Fig. 10
Electrical connections
!Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Prior to commencing any work, touch earthed
objects such as heating or water pipes to dis-
charge static loads.
Installing the boiler
Opening the control unit enclosure
5789330
Installation

17
L N
230V~ 230V~
96 40
1LN
145
2
1
40962035100
2 1 3 2 15 4 21
B
A
X21
20
21
Fig. 11
Connections to 230 V~ plugs
fÖ Power supply
The power cable is connected in the delivered con-
dition.
lH ■Power supply for accessories
■External demand/blocking
Connections to LV plugs
X3 Remove for easier installation.
!Outside temperature sensor
?Flow temperature sensor for low loss header
(accessories)
ARadio clock receiver
X14 aVG KM-BUS subscriber (accessories)
■Vitotrol 200-A or Vitotrol 300-A remote control
■Vitocom 100, type GSM
■Mixer extension kit
■AM1 extension
■EA1 extension
■Wireless base station
■KM-BUS distributor
X21 CO limiter (accessories)
Information on connecting accessories
When connecting accessories observe the sep-
arate installation instructions provided with
them.
Routing the power cable
C
B
A
230 V~
Fig. 12
Note
The power cable (already connected to the control
unit) is packed in the appliance behind the control unit.
ALON communication module (accessories)
BMain PCB
CInternal extension (accessories)
Installing the boiler
Electrical connections (cont.)
5789330
Installation

18
External demand via switching contact
Connection options:
■EA1 extension (accessory, see separate installation
instructions)
■Plug lH
When the contact is closed, burner operation is load-
dependent. The boiler water is heated to the set value
selected in parameter/coding address "9b" in the
"General"/1 group. The boiler water temperature is
limited by this set value and by the electronic maxi-
mum limit (coding address "06" in the "Boiler"/2
group).
!Please note
Live contacts lead to short circuits or phase fail-
ure.
The external connection must be floating and
meet the requirements of protection class II.
Plug lH EA1 extension
A
lH
N
?
1L
AFloating contact (when connecting, remove jumper
between L and 1)
B
[{S
DE [{D DE
[{A
DE
A
AFloating contact
BEA1 extension
Parameters/codes
■"4b:1" in the "General"/1 group
■Effect of the function on the relevant heating circuit
pump:
Parameter/coding address "d7" in the "Heating cir-
cuit" group (only for weather-compensated control
units)
■Effect of the function on the circulation pump for cylin-
der heating:
Parameter/coding address "5F" in the "DHW"/3
group
Parameters/codes
■Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 2 in the
"General"/1 group
■Effect of the function on the relevant heating circuit
pump:
Parameter/coding address "d7" in the "Heating cir-
cuit" group (only for weather-compensated control
units)
■Effect of the function on the circulation pump for cylin-
der heating:
Parameter/coding address "5F" in the "DHW"/3
group
External demand via 0 – 10 V input
Connection at 0 – 10 V input at EA1 extension.
Ensure DC separation between the earth conductor
and the negative pole of the on-site power source.
Installing the boiler
Electrical connections (cont.)
5789330
Installation

19
U
+
LNL
N
fÖ
SP
aBJ
Ö
[{{]
0-10V f-]
A
+ -
Fig. 13
0 to 1 V No specification for set boiler water
temperature
1 V Set value 10 °C
10 V Set value 100 °C
External blocking via switching contact
Connection options:
■Plug lH
■EA1 extension (accessory, see separate installation
instructions)
When the contact is closed, the burner is switched off.
The heating circuit pump and (if installed) the circula-
tion pump for cylinder heating are switched according
to the set parameter/code (see the following table
"Parameters/codes").
!Please note
Live contacts lead to short circuits or phase fail-
ure.
The external connection must be floating and
meet the requirements of protection class II.
Installing the boiler
Electrical connections (cont.)
5789330
Installation

20
Plug lH EA1 extension
A
lH
N
?
1L
AFloating contact (when connecting, remove jumper
between L and 1)
B
[{S
DE [{D DE
[{A
DE
A
AFloating contact
BEA1 extension
Parameters/codes
■"4b:2" in the "General"/1 group
■Effect of the function on the heating circuit pump:
Parameter/coding address "d6" in the "Heating cir-
cuit" group (only for weather-compensated control
units)
■Effect of the function on the circulation pump for cylin-
der heating:
Parameter/coding address "5E" in the "DHW"/3
group
Parameters/codes
■Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 3 or 4 in
the "General"/1 group
■Effect of the function on the heating circuit pump:
Parameter/coding address "d6" in the "Heating cir-
cuit" group (only for weather-compensated control
units)
■Effect of the function on the circulation pump for cylin-
der heating:
Parameter/coding address "5E" in the "DHW"/3
group
Power supply for accessories at plug lH (230 V ~)
Where the boiler is sited in a wet room, accessories
outside the wet area must not be connected to the
power supply at the control unit. If the boiler is not
sited in a wet room, the power supply for accessories
can be connected at the control unit. This connection
is switched directly with the ON/OFF switch of the con-
trol unit.
If the total system current exceeds 6 A, connect one or
more extensions directly to the mains supply via an
ON/OFF switch (see next chapter).
Note
Connect all accessories to the power supply with flexi-
ble cables.
Installing the boiler
Electrical connections (cont.)
5789330
Installation