Viessmann Vitodens 222-F User manual

Installation and service instructions
for contractors
VIESMANN
Vitodens 222-F
Type B2SB, 1.9 to 26.0 kW
Gas condensing storage combi boiler
Natural gas and LPG version
For applicability, see the last page
VITODENS 222-F
5778 729 GB 9/2016 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-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.
■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
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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).
What to do 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 iso-
lator (e.g. fuse box, domestic power distribu-
tion).
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 causes. 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-
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.)
5778 729 GB

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1. Information Disposal of packaging ............................................................................ 6
Symbols ................................................................................................. 6
Intended use .......................................................................................... 7
Product information ................................................................................ 7
■Vitodens 222-F, type B2SB ................................................................. 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
Connections on the heating water and DHW side ................................. 13
■Connection on the DHW side ............................................................. 13
Flue gas connection ............................................................................... 13
Gas connection ...................................................................................... 14
Opening the control unit enclosure ........................................................ 15
Electrical connections ............................................................................ 15
■Routing the power cable ..................................................................... 16
■Outside temperature sensor ! .......................................................... 18
■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 ................................................................. 21
Closing the control unit enclosure .......................................................... 22
Fitting the front panels ........................................................................... 23
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 24
5. Codes Coding level 1 ........................................................................................ 46
■Calling up coding level 1 ..................................................................... 46
■"General"/Group 1 ............................................................................. 46
■"Boiler"/Group 2 ................................................................................ 47
■"DHW"/Group 3 .................................................................................. 48
■"Heating circuit ..."/Group 5 ............................................................. 48
Coding level 2 ........................................................................................ 49
■Calling up coding level 2 ..................................................................... 49
■"General"/Group 1 ............................................................................. 49
■"Boiler"/Group 2 ................................................................................ 53
■"DHW"/Group 3 .................................................................................. 55
■"Heating circuit ..."/Group 5 ............................................................. 56
6. Diagnosis and service
scans
Service menu ......................................................................................... 57
■Calling up the service menu ............................................................... 57
■Exiting the service menu .................................................................... 57
Diagnosis ............................................................................................... 57
■Operating data .................................................................................... 57
Brief scan ............................................................................................... 57
Checking outputs (actuator test) ............................................................ 59
7. Troubleshooting Fault display ........................................................................................... 60
■Constant temperature control unit ...................................................... 60
Fault codes ............................................................................................ 60
Maintenance .......................................................................................... 67
■Putting the control unit into the service position ................................. 67
■Draining the boiler on the heating water side ..................................... 68
■Checking the outside temperature sensor .......................................... 69
Index
Index
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■Checking the boiler water temperature sensor, cylinder temperature
sensor or flow temperature sensor of low loss header ....................... 70
■Checking the flue gas temperature sensor ......................................... 71
■Checking the temperature limiter ........................................................ 71
■Checking the fuse/MCB ...................................................................... 72
8. Parts lists Overview of assemblies ......................................................................... 73
■Ordering parts ..................................................................................... 73
Casing .................................................................................................... 74
Heat cell ................................................................................................. 76
MatriX cylinder burner ............................................................................ 78
Hydraulics .............................................................................................. 80
Hydraulic block ...................................................................................... 84
DHW cylinder ......................................................................................... 86
Control unit ............................................................................................ 88
Miscellaneous ........................................................................................ 90
Ordering individual parts for accessories ............................................... 92
9. Function description Constant temperature control unit ......................................................... 93
■Heating mode ..................................................................................... 93
■DHW heating with gas condensing combi boiler ................................ 93
■DHW heating with gas condensing boiler ........................................... 93
Internal extensions (accessories) .......................................................... 94
■Internal H1 extension .......................................................................... 94
■Internal H2 extension .......................................................................... 95
External extensions (accessories) ......................................................... 96
■AM1 extension .................................................................................... 96
■EA1 extension .................................................................................... 97
Control functions .................................................................................... 98
■External operating program changeover ............................................ 98
■External blocking ................................................................................ 99
■External demand ................................................................................ 99
■Venting program ................................................................................. 99
■Fill program .........................................................................................100
Electronic combustion control unit ......................................................... 100
10. Connection and wiring dia-
grams
Connection and wiring diagram – internal connections ......................... 101
Connection and wiring diagram – external connections ........................ 102
11. Commissioning/service
reports
................................................................................................................103
12. Specification ................................................................................................................104
13. Certificates Declaration of conformity ....................................................................... 106
■Manufacturer's declaration ................................................................. 106
Manufacturer's certificate according to the 1st BImSchV [Germany] .... 107
14. Keyword index ................................................................................................................108
Index
Index (cont.)
5778 729 GB

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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
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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 B2SB
Wall mounted gas condensing boiler with Inox-Radial
heat exchanger and the following integrated compo-
nents:
■Modulating MatriX cylinder burner for natural gas
and LPG
■Integral DHW cylinder with internal indirect coils,
130 l capacity
■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)
Preset for operation with natural gas E and
natural gas LL. For conversion to LPG P (without con-
version kit), see "Commissioning, inspection and main-
tenance".
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
5778 729 GB
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.
!Please note
Avoid damaging the appliance.
Connect all pipework free of load and torque
stress.
The following diagram shows sample connection sets
for installation on finished walls, with connection to the
top or side.
A
C
D
F
E
B
E
F
B
A
D
C
K
G
H
G
100
569
46
40
50
1172
1227
1282
1337
1391
1447
1502
1637
1677
1685
1726
945 950
80
140
50
320
361
398
410
Ø 60,5+0,8
Ø 96-0,5
Fig. 1
G
C
A
B
F
D
E
a
50
595
50
600
55
220
330
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
(kW)
13 19 26
a (mm) 201 201 224
Note
All height dimensions have a tolerance of +7 mm on
account of the adjustable feet.
Preparing for installation
Preparing for boiler installation
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Installation

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1. Prepare the connections on the heating water side.
Thoroughly flush the heating system.
Note
Should an additional expansion vessel be required
on site, connect this vessel in the heating return.
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 page 10).
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
drain line or trap:
■Drain towards the back:
see dimensions for condensate hose M and
position G in diagram on page 8.
■Drain towards the side aperture:
see position H in diagram on page 8.
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 drain line or a trap.
4. Prepare the gas connection according to TRGI or
TRF [or local regulations].
5. Prepare 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/MCB rating 16 A, 230 V~, 50 Hz (duct rout-
ing, see page 16).
■Accessory cables: 0.75 mm² flexible cable with
required number of cores for external connec-
tions
Preparing for installation
Preparing for boiler installation (cont.)
5778 729 GB
Installation

10
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. 4
ASafety assembly (accessories for connection sets
for unfinished walls)
BSafety valve
CVisible discharge pipe outlet point (tundish)
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
Preparing for boiler installation (cont.)
5778 729 GB
Installation

11
1.
4.
2x
3.
2.
5.
Fig. 5
Installing the boiler
Removing the front panels
5778 729 GB
Installation

12
1.
2.
SW17
Fig. 6
Note
Align the boiler flush with the wall.
Installing the boiler
Siting and levelling the boiler
5778 729 GB
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 accessory)
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
Flue gas connection
Note
The "System certificate" and "Skoberne GmbH flue
system" labels enclosed with the technical documenta-
tion may only be used in conjunction with the
Viessmann flue system made by Skoberne.
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 code 7E:1
Installing the boiler
Connections on the heating water and DHW side
5778 729 GB
Installation

14
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.
■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.
Gas connection
A
AA
Fig. 8
1. Seal gas shut-off valve A to the gas connection.
Information on operation with LPG
Install an external safety solenoid valve if the boiler
is installed below ground level.
2. Carry out a tightness test.
Note
Only use suitable and approved leak detection
agents (EN 14291) and devices for the tightness
test. Leak detection agents with unsuitable constit-
uents (e.g. nitrides, sulphides) can cause material
damage.
Remove leak detection agent residues after test-
ing.
!Please note
Excessive test pressure will damage the
boiler and the gas train.
Max. test pressure 150 mbar (15 kPa). If a
higher pressure is required for tightness
tests, disconnect the boiler and the gas train
from the main supply pipe (undo the fitting).
3. Purge the gas line.
Installing the boiler
Flue gas connection (cont.)
5778 729 GB
Installation

15
2x
4x
4.
3.
5.
2.
1.
Fig. 9
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
5778 729 GB
Installation

16
Routing the power cable
C
B
A
230 V~
Fig. 10
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.)
5778 729 GB
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
ARadio clock receiver
BJumper
Connections to 230 V~ plugs
fÖ Power supply
lH ■Power supply for accessories
■External demand/blocking
■Room temperature controller (remove jumper B
when making this connection):
–Vitotrol 100, type UTA
–Vitotrol 100, type UTDB
–Vitotrol 100, type UTDB-RF
Connections to LV plugs
X3 Plug X3 can be removed to facilitate installation.
!Outside temperature sensor
?Flow temperature sensor for low loss header
(accessories)
ARadio clock receiver
X4 KM-BUS connection, variable speed heating cir-
cuit pump (if installed)
X21 CO limiter (accessories)
aVG KM-BUS subscriber (accessories)
To connect several accessories, see page 20.
■Vitocom 100, type GSM
■AM1 extension
■EA1 extension
■Wireless base station
■KM-BUS distributor
Information on connecting accessories
When connecting accessories observe the sep-
arate installation instructions provided with
them.
Installing the boiler
Electrical connections (cont.)
5778 729 GB
Installation

18
Outside temperature sensor !
For fitting the wireless outside temperature sensor
(wireless accessory):
Wireless base station installation and service
instructions
Fitting location for outside temperature sensor
■North or north-western wall, 2 to 2.5 m above ground
level; in multi storey buildings, in the upper half of the
second floor
■Not above windows, doors or vents
■Not immediately below balconies or gutters
■Never render over
Outside temperature sensor connection
2-core lead, length max. 35 m with a cross-section of
1.5 mm2
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 coding address "9b" in group "General"/1.
The boiler water temperature is limited by this set
value and by the electronic maximum limit (coding
address "06" in group "Boiler"/2).
!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 connected, remove jumper
between L and 1)
B
[{S
DE [{D DE
[{A
DE
A
AFloating contact
BEA1 extension
Codes
■"4b:1" in group "General"/1
■Effect of the function on the relevant heating circuit
pump:
coding address "d7" in group "Heating circuit" (only
for weather-compensated control units)
■Effect of the function on the circulation pump for cylin-
der heating:
coding address "5F" in group "DHW"/3
Codes
■Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 2 in
group "General"/1
■Effect of the function on the relevant heating circuit
pump:
coding address "d7" in group "Heating circuit" (only
for weather-compensated control units)
■Effect of the function on the circulation pump for cylin-
der heating:
coding address "5F" in group "DHW"/3
External demand via 0 – 10 V input
Connection at 0 – 10 V input at EA1 extension.
Installing the boiler
Electrical connections (cont.)
5778 729 GB
Installation

19
Ensure DC separation between the earth conductor
and the negative pole of the on-site power source.
U
+
LNL
N
fÖ
SP
aBJ
Ö
[{{]
0-10V f-]
A
+ -
Fig. 12
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 code (see the following table "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.
Plug lH EA1 extension
A
lH
N
?
1L
AFloating contact (when connected, remove jumper
between L and 1)
B
[{S
DE [{D DE
[{A
DE
A
AFloating contact
BEA1 extension
Codes
■"4b:2" in group "General"/1
■Effect of the function on the heating circuit pump:
coding address "d6" in group "Heating circuit" (only
for weather-compensated control units)
■Effect of the function on the circulation pump for cylin-
der heating:
coding address "5E" in group "DHW"/3
Codes
■Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 3 or 4 in
group "General"/1.
■Effect of the function on the heating circuit pump:
coding address "d6" in group "Heating circuit" (only
for weather-compensated control units)
■Effect of the function on the circulation pump for cylin-
der heating:
coding address "5E" in group "DHW"/3
Installing the boiler
Electrical connections (cont.)
5778 729 GB
Installation

20
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 (plastic sheath).
Power supply to all accessories via heat source control unit
fÖ fÖ
B C
aVG fÖ lH
A D
E
aVG aVG f-]
A
aVG aVG f-]
A
fÖ aVG aVG f-]
A
Fig. 13
Some accessories with direct power supply
B CA D
E
fÖ fÖ aVG fÖ lH aVG aVG f-]
A
aVG aVG f-]
A
fÖ aVG aVG f-]
A
Fig. 14
AHeat source control unit
BExtension kit for heating circuit with mixer M2
(control unit for weather-compensated operation
only)
CExtension kit for heating circuit with mixer M3
(control unit for weather-compensated operation
only)
DAM1 extension or EA1 extension
EOn-site ON/OFF switch
fÖ Mains input
fÖAPower outlet
lH Power outlet at the control unit
aVG KM BUS connection
If the current flowing to the connected working parts
(e.g. circulation pumps) is higher than the fuse rating
of the relevant accessory, only use the output con-
cerned to control an on-site relay.
Accessories Internal fuse protec-
tion
Extension kit for heating circuit
with mixer
2 A
AM1 extension 4 A
EA1 extension 2 A
Installing the boiler
Electrical connections (cont.)
5778 729 GB
Installation