Viessmann Vitodens 222-F Quick guide

Installation and service instructions
for contractors
VIESMANN
Vitodens 222-F
Type B2TE, 1.9 to 32 kW
Gas condensing storage combi boiler
Natural gas and LPG version
VITODENS 222-F
6130884 GB 6/2019 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
■Relevant country-specific safety regulations
Safety instructions for working on the system
Working on the system
■Where gas is used as the fuel, close the main gas
shut-off valve and safeguard it against unintentional
reopening.
■Isolate the system from the power supply, e.g. by
removing the separate fuse or by means of a mains
isolator, and check that it is no longer live.
■Safeguard the system against reconnection.
■Wear suitable personal protective equipment when
carrying out any work.
Danger
Hot surfaces and fluids can lead to burns or
scalding.
■Before maintenance and service work, switch
OFF the appliance and let it cool down.
■Never touch hot surfaces on the boiler, burner,
flue system or pipework.
!Please note
Electronic 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
Safety instructions
6130884

3
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.
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.)
6130884

4
1. Information Disposal of packaging ............................................................................ 6
Symbols ................................................................................................. 6
Intended use .......................................................................................... 6
Product information ................................................................................ 7
■Vitodens 222-F, type B2TE ................................................................. 7
System examples .................................................................................. 7
Spare parts lists ..................................................................................... 7
2. Preparing for installation Handling ................................................................................................. 8
Siting in recesses ................................................................................... 8
■Relocating the ON/OFF switch and electrical connections (if neces-
sary) .................................................................................................... 8
Preparing for boiler installation .............................................................. 9
■Safety assembly to DIN 1988 and EN 806 ......................................... 12
3. Installation sequence Siting the boiler ...................................................................................... 13
■Type plate ........................................................................................... 13
Removing the front panel ....................................................................... 14
Connections on the heating water and DHW sides ............................... 14
■DHW circulation connection (potable water) ...................................... 15
Filling the trap with water ....................................................................... 15
Flue gas connection ............................................................................... 15
Gas connection ...................................................................................... 16
Electrical connections ............................................................................ 17
■Opening the HMU wiring chamber ..................................................... 17
■On-site connections on HMU heat management unit ......................... 18
■Outside temperature sensor ! .......................................................... 18
■Connecting the circulation pump to P2 ............................................... 19
■Floating switching contact connection ................................................ 19
■Checking the CAN bus terminator switch setting ............................... 19
■Power supply for accessories at plug lH/aBH (230 V ~) ..................... 20
■Power supply fÖ ................................................................................. 22
■WiFi operational reliability and system requirements ......................... 22
■Routing connecting cables/leads ........................................................ 23
Closing the wiring chamber ................................................................... 24
Fitting the front panel and programming unit ......................................... 24
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 25
5. System configuration
(parameters)
Calling up parameters ............................................................................ 55
General .................................................................................................. 55
Boiler ...................................................................................................... 57
DHW ...................................................................................................... 59
Heating circuit 1, Heating circuit 2, Heating circuit 3, Heating circuit 4 .. 60
Subscriber numbers of connected extensions ....................................... 65
6. Diagnosis and service
checks
Service menu ......................................................................................... 67
■Calling up the service menu ............................................................... 67
Diagnosis ............................................................................................... 67
■Checking operating data ..................................................................... 67
Checking outputs (actuator test) ............................................................ 68
7. Troubleshooting Fault display on the programming unit ................................................... 70
■Calling up fault messages .................................................................. 70
■Acknowledging the fault display ......................................................... 70
■Calling up acknowledged fault messages .......................................... 70
■Calling up fault messages from the fault memory (message history) . 71
■Deleting messages ............................................................................. 72
Overview of electronics modules ........................................................... 72
Index
Index
6130884

5
Fault messages ..................................................................................... 73
Repairs .................................................................................................. 89
■Shutting down the boiler ..................................................................... 89
■Draining the boiler on the heating water side ..................................... 90
■Checking the temperature sensors ..................................................... 91
■Information on replacing the HMU heat management unit and BCU
burner control unit ............................................................................... 93
■Checking the plate heat exchanger .................................................... 94
■Removing the hydraulic unit and return pipe ...................................... 95
■Replacing the power cable ................................................................. 96
■Checking the fuse ............................................................................... 97
8. Function description Control functions .................................................................................... 98
■Heating mode ..................................................................................... 98
■Venting program ................................................................................. 98
■Filling program .................................................................................... 98
■Heating curve ..................................................................................... 98
■Screed drying ..................................................................................... 100
■Raising the reduced room temperature .............................................. 102
DHW heating ......................................................................................... 103
■Heating the DHW loading cylinder from cold ...................................... 103
■Reheating when DHW is drawn off .....................................................103
■Increased DHW hygiene .....................................................................104
9. Connection and wiring dia-
gram
HMU heat management unit ..................................................................105
BCU burner control unit ......................................................................... 107
10. Commissioning/service
reports
................................................................................................................108
11. Specification Specification .......................................................................................... 109
Electronic combustion control unit ......................................................... 111
12. Disposal Final decommissioning and disposal ..................................................... 112
13. Certificates Declaration of conformity ....................................................................... 113
Manufacturer's certificate according to the 1st BImSchV [Germany] .... 113
14. Keyword index ................................................................................................................ 114
Index
Index (cont.)
6130884

6
Please dispose of packaging waste in line with statu-
tory regulations.
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.
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.
Information
Disposal of packaging
6130884
Information

7
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 B2TE
Gas condensing storage combi boiler with Inox-Radial
heat exchanger and the following integrated compo-
nents:
■Modulating MatriX Plus burner for natural gas and
LPG
■DHW loading cylinder, 100 l capacity
■Hydraulics with 3-way diverter valve and variable
speed high efficiency circulation pump
■Weather-compensated control unit
■Diaphragm expansion vessel (18 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 switching to LPG or
natural gas M (without conversion kit), see "Commis-
sioning, inspection and maintenance".
The Vitodens 222-F may only be delivered to the coun-
tries specified on the type plate. For deliveries to other
countries, approved contractors must arrange individ-
ual approval on their own initiative and in accordance
with the law of the country in question.
System examples
System examples with hydraulic and electrical connec-
tion diagrams and function descriptions are available
to help setting up the heating system.
Detailed information on system examples can be found
at: www.viessmann-schemes.com
Spare parts lists
Information about spare parts can be found on the
Viessmann spare parts app.
Information
Intended use (cont.)
6130884
Information

8
!Please note
Prevent damage to the appliance during han-
dling.
Never set the appliance down on its front or
sides, or apply any load to these surfaces. If
possible, leave the boiler on the pallet during
handling.
Siting in recesses
When delivered, the ON/OFF switch and the electrical
connections are located on the left-hand side of the
appliance. When installing in recesses, ensure that
access is guaranteed. Otherwise relocate the ON/OFF
switch and electrical connections accordingly. The
ON/OFF switch can be relocated to the right-hand side
or the top. The electrical connections can be relocated
to the right-hand side.
Relocating the ON/OFF switch and electrical connections (if necessary)
1.
8.2.
4.
5.
3.
3.
Fig. 1
Preparing for installation
Handling
6130884
Installation

9
Open the electrical wiring chamber of the HMU. Dis-
connect the cable of the ON/OFF switch and remove.
See electrical connections.
1. Unclip the ON/OFF switch from the frame
2. Remove the ON/OFF switch and its cable.
3. Clip the ON/OFF switch into the corresponding
opening at the top or on the right-hand side.
Reconnect the cable in the HMU wiring chamber
and relieve strain.
4. Release plug of electrical connections by turning it
a quarter turn.
5. Insert plug into the opening on the right-hand side
and secure in place by turning it a quarter turn.
Preparing for boiler installation
Use a connection set – available as an accessory – to
make the connections on the gas and water sides. The
following overview shows sample connection sets for
surface mounting, with connection to the top or side.
Attaching accessories
Before final siting, attach all of the accessories that are
to be mounted from the back of the boiler (e.g. connec-
tion set). First fit the connection set for the DHW circu-
lation pump.
!Please note
To prevent appliance damage,
connect all pipework free of load and torque
stress.
Preparing connections on site:
Connection set installation instructions
Note
Fit safety equipment in accordance with the national
regulations.
Preparing for installation
Siting in recesses (cont.)
6130884
Installation

10
55
946
1001
1111
1221
1276
1440
1452
1488
1503
1563
362
398
410
470
100
50
A
B
C
D
EAB
C
D
E
600
46
50
Ø60
Ø100
A
B
67
50
206
595
600
E
D
220
330
K
H
C
FF
1056
1166
1400
G
F
735
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 accessories)
GExternal plug
HCondensate drain to the side
KArea for electrical cables (on-site junction box)
Note
All height dimensions have a tolerance of +15 mm on
account of the adjustable feet.
Preparing for installation
Preparing for boiler installation (cont.)
6130884
Installation

11
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.
20
M
N
L
>3°
Fig. 3
2. Prepare the connections on the DHW side. Install
the safety assembly (accessories or on-site provi-
sion) in accordance with EN 806 [or local regula-
tions] in the cold water supply. 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.
Note
Do not connect the DHW cylinder safety valve to
hose L. Do not change the position of hose L
(used for ventilation).
3. Route condensate hose M to side opening H
(see diagram on page 10).
Connect condensate hose with a fall to the on-site
waste water pipe or trap.
Note
■The on-site waste water pipe must have min.
Ø 40 mm to allow inflow with no risk of backing
up.
■Keep the drainage route from the appliance as
short as possible.
■Do not connect the drain hose directly to the on-
site waste water pipe. To prevent bacterial con-
tamination from the drain network, observe a
minimum clearance of 20 mm (see diagram).
!Please note
The drain hose is used to route away any
hot water discharged from the safety valve.
Lay and secure the drain hose in a way that
prevents any risk of scalding.
Note
Route the onward drain line inside the building as
far as possible.
If the onward drain line is routed outside the build-
ing:
■Use a min. Ø 30 mm line.
■Protect the line from frost.
■Keep the line as short as possible.
Preparing for installation
Preparing for boiler installation (cont.)
6130884
Installation

12
4. Prepare gas connection to TRGI [or local regula-
tions].
5. Prepare the electrical connections.
■The appliance is delivered fitted with a power
cable (approx. 1.5 m long).
■Power supply: 230 V, 50 Hz, fuse rating
max. 16 A
Note
Connect the power cable to the electricity supply
using a fixed connection.
■Accessory cables: 0.75 mm2 flexible PVC cable
with required number of cores for external con-
nections.
Note
Route external pipes through guide N.
Safety assembly to DIN 1988 and EN 806
C
F
B
D E GH D
K
D H L M D N K
A
O
Fig. 4
ASafety assembly to DIN 1988 and EN 806 (acces-
sories for connection sets for flush mounting)
BSafety valve
CVisible discharge pipe outlet point
DShut-off valve
EFlow regulating valve (installation recommended)
FPressure gauge connector
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)
Preparing for installation
Preparing for boiler installation (cont.)
6130884
Installation

13
2.
1.
Fig. 5
Type plate
Note
The type plate is attached to cover panel A in the
appliance. See page 35.
Attaching the additional type plate
1. Take the additional type plate from the documenta-
tion supplied with the boiler.
Note
The documentation with additional type plate and
QR code (for registering the appliance) can be
found on top of the appliance.
2. In consultation with the system user, affix the addi-
tional type plate to the outside of the appliance.
The additional type plate must be visible to the flue
gas inspector.
Affix the QR code for appliance registration to the
additional type plate.
Installation sequence
Siting the boiler
6130884
Installation

14
3.
2.
1.
Fig. 6
Connections on the heating water and DHW sides
A
B
D
A B D E
E
D
B
A
C
C
C
E
Fig. 7 Shown with connection sets for surface
mounting (accessories)
AHeating flow R ¾
BDHW R ½
CDHW circulation R ½ (separate accessories)
DCold water R ½
EHeating return R ¾
Installation sequence
Removing the front panel
6130884
Installation

15
DHW circulation connection (potable water)
DHW circulation connection with DHW circulation
pump connection set (accessories)
Separate installation instructions
Filling the trap with water
Note
If there is a risk of frost, only fill the trap just before
commissioning.
Fig. 8
Pour at least 0.3 l of water into the flue gas connection.
Danger
During commissioning, flue gas may escape
from the condensate drain.
Always fill the trap with water before commis-
sioning.
Flue gas connection
Connect the balanced flue pipe.
Flue system installation instructions
Note
The "System certification" 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.
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.
Installation sequence
Connections on the heating water and DHW sides (cont.)
6130884
Installation

16
A
A
A
Fig. 9
1. If the gas connection has not been fitted previ-
ously, seal gas shut-off valve A to the gas con-
nection.
When carrying out any work on gas connection fit-
tings, counterhold with a suitable tool. Never trans-
fer any forces to the internal components.
Information on operation with LPG
Install an external safety solenoid valve if the boiler
is installed below ground level.
An EM-EA1 extension (accessories) is required to
connect the safety solenoid valve.
2. Check for leaks.
Danger
Escaping gas leads to a risk of explosion.
Check all connections on the gas side (also
inside the appliance) 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.
Installation sequence
Gas connection
6130884
Installation

17
Opening the HMU wiring chamber
!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.
3.
1.
2x
2.
Fig. 10
Note
For further information on the connections, see the fol-
lowing chapters.
A B
C
6 5 4 3 2 1
6 5 4 3 2 1
1~
M
1~
M
5
40 156 156 P1 96 74 1 91 915P2
Fig. 11
Connections to 230 V~ plugs
fÖ Power supply
lH 230 V input, floating
Output 230 V
aBH Switched power outlet
P1 Cylinder loading pump (connected in the deliv-
ered condition)
Installation sequence
Electrical connections
6130884
Installation

18
P2 230 V parametrisable output:
DHW circulation pump or heating circuit pump for
heating circuit without mixer (in systems with low
loss header)
ABCU burner control unit power supply (connected
in the delivered condition)
BPower supply for accessories
CPlug located externally on the right or left-hand
side of the appliance (see also following diagram)
Connections to extra low voltage (ELV) plugs
!Outside temperature sensor
Terminals 1 and 2 on external plug C
%Cylinder temperature sensor (connected in the
delivered condition)
jF PlusBus
Terminals 5 and 6 on external plug C
lA CAN bus
Information on connecting accessories
When connecting accessories observe the sep-
arate installation instructions provided with
them.
On-site connections on HMU heat management unit
6 5 4 3 2 1
6 5 4 3 2 1
C
Fig. 12
CPlug located externally on the right or left-hand
side of the appliance (supplied separately)
Required plugs are supplied in separate packaging. Provide strain relief for cables in the wiring chamber of
the HMU heat management unit using cable ties.
Outside temperature sensor !
Fitting location for outside temperature sensor
■North or north-westerly 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 up to 35 m with a cross-section
of 1.5 mm2
Installation sequence
Electrical connections (cont.)
6130884
Installation

19
Connecting the circulation pump to P2
B
A
1~
M
Fig. 13
ACirculation pump
BPlug P2 on HMU heat management unit
Possible functions:
■Heating circuit pump for heating circuit without mixer
A1 in connection with low loss header and heating
circuits with mixer
■DHW circulation pump
Connect DHW circulation pumps with standalone
functions directly to the 230 V∼ supply.
Information on priority of connection options:
■If heating circuit pump for heating circuit without
mixer A1 is installed:
Connect heating circuit pump to output P2.
Then connect DHW circulation pump to an EM-P1
extension (accessories).
■If no heating circuit pump for heating circuit without
mixer A1 is connected:
Connect DHW circulation pump to output P2.
The function is selected in the commissioning assistant
by selecting the connected component.
Specification
Rated current 1 A
Rated voltage 230 V ~
Floating switching contact connection
Connection at plug lH
One of the following functions can be connected:
■External demand
■External blocking
■DHW circulation pump external demand (pushbutton
function, pump runs for 5 min). Cannot be connected
with Vitodens 222-W.
■Room temperature controller (room thermostat)
For room temperature-dependent operating mode
A
lH
N
?
1L
Fig. 14
AFloating contact
Assigning functions in the commissioning assis-
tant
See commissioning assistant in "Commissioning".
Checking the CAN bus terminator switch setting
The CAN bus resistor is switched using switch A in
the wiring chamber.
Installation sequence
Electrical connections (cont.)
6130884
Installation

20
1 91 91
ON
A
Fig. 15
■If the device is not integrated into a CAN bus sys-
tem:
Switch A must not be set to "ON".
■If the device is integrated into a CAN bus system and
is located at the beginning or end of this system (not
in the middle) of the CAN bus system (connected to
only one plug lA): Set switch A to "ON".
C C
A
91 91
B B
ON
Fig. 16
■If the device is integrated into a CAN bus system and
is not located at the beginning or end of the CAN
bus system (both plugs lA connected): Do not set
switch A to "ON".
A C
C
B B
91 91
ON
Fig. 17
Power supply for accessories at plug lH/aBH (230 V ~)
When positioned in wet rooms, accessories outside
the wet area must not be connected to the power sup-
ply at the HMU heat management unit. If the boiler is
not sited in a wet room, the power supply for accesso-
ries can be connected directly to the HMU heat man-
agement unit. This connection is switched directly with
the ON/OFF switch of the appliance.
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).
Installation sequence
Electrical connections (cont.)
6130884
Installation