Viessmann Vitodens 200-W System Quick guide

Installation and service instructions
for contractors
VIESMANN
Vitodens 200-W
Type B2HB, B2KB, 1.8 to 35 kW
Wall mounted gas condensing boiler with Vitotronic 200, weather-compensated
Natural gas and LPG version
For applicability, see the last page
VITODENS 200-W
5812781 GB/en 10/2017 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
5812781

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.)
5812781

4
1. Information Disposal of packaging ............................................................................ 7
Symbols ................................................................................................. 7
Intended use .......................................................................................... 7
Product information ................................................................................ 8
■Vitodens 200-W, type B2HB, B2KB .................................................... 8
2. Preparing for installation ................................................................................................................ 9
3. Installation sequence Mounting the boiler and making connections ........................................ 11
■Removing the front panel ................................................................... 11
■Fitting the boiler to the pre-plumbing jig ............................................. 13
■Connections on the heating water and DHW sides ............................ 14
Flue gas connection ............................................................................... 15
Condensate connection ......................................................................... 15
Gas connection ...................................................................................... 16
Opening the control unit enclosure ........................................................ 16
Electrical connections ............................................................................ 18
■Routing connecting cables/leads ........................................................ 19
■Outside temperature sensor ! .......................................................... 19
■Connecting the Vitoconnect 100 connecting cable (accessories) ...... 20
■External demand via switching contact .............................................. 20
■External demand via 0 – 10 V input .................................................... 21
■External blocking via switching contact .............................................. 21
■Power supply for accessories at plug lH (230 V ~) ............................ 22
■Power supply fÖ ................................................................................. 23
■Routing connecting cables/leads ........................................................ 24
Closing the control unit enclosure and inserting the programming unit . 24
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 25
5. Parameter level 1 Calling up parameter level 1 .................................................................. 54
General .................................................................................................. 55
Boiler ...................................................................................................... 56
DHW ...................................................................................................... 57
Solar ...................................................................................................... 57
Heating circuit 1, heating circuit 2, heating circuit 3 ............................... 59
6. Parameter level 2 Calling up parameter level 2 .................................................................. 63
General .................................................................................................. 64
Boiler ...................................................................................................... 71
DHW ...................................................................................................... 74
Solar ...................................................................................................... 77
Heating circuit 1, heating circuit 2, heating circuit 3 ............................... 81
7. Diagnosis and service
checks
Calling up the service menu .................................................................. 89
Exiting the service menu ........................................................................ 90
Changing the passwords ....................................................................... 90
Resetting all passwords to the factory setting ....................................... 90
Diagnosis ............................................................................................... 90
■Calling up operating data .................................................................... 90
■Calling up the device status ................................................................ 91
■Calling up the solar circuit pump status .............................................. 91
■Brief scan ............................................................................................ 91
Checking outputs (actuator test) ............................................................ 93
8. Troubleshooting Fault display ........................................................................................... 95
Fault messages ..................................................................................... 95
Repairs .................................................................................................. 108
■Shutting down the boiler ..................................................................... 108
Index
Index
5812781

5
■Removing the boiler for servicing ....................................................... 109
■Checking the temperature sensors ..................................................... 111
■Checking the outlet temperature sensor or comfort sensor (only for
gas condensing combi boilers) ........................................................... 113
■Checking the plate heat exchanger .................................................... 114
■Checking the temperature limiter ........................................................ 115
■Checking for interchange of flow/return connections in solar circuit ... 115
■Checking the fuse ............................................................................... 116
■Mixer extension kit .............................................................................. 116
■Checking the Vitotronic 200-H (accessories) ......................................117
9. Parts lists Overview of assemblies ......................................................................... 118
■Serial no. 7570775, 7570776, 7570777, 7570779, 7570781,
7570782, 7570783, 7570785 .............................................................. 119
■Serial no. 7570778, 7570780, 7570784, 7570786 ............................. 120
Casing assembly ................................................................................... 122
Heat cell assembly .................................................................................124
MatriX cylinder burner assembly ........................................................... 126
Hydraulic assembly ................................................................................128
■Serial no. 7570775, 7570776, 7570777, 7570779, 7570781,
7570782, 7570783, 7570785 ..............................................................128
■Serial no. 7570778, 7570780, 7570784, 7570786 ............................. 130
Hydraulic assembly, system boiler .........................................................132
Hydraulic assembly, combi boiler .......................................................... 134
Control unit assembly ............................................................................ 136
Miscellaneous assembly ........................................................................138
Ordering individual parts for accessories ...............................................140
10. Function description Control unit ............................................................................................ 141
■Heating mode ..................................................................................... 141
■DHW heating with gas condensing combi boiler ................................ 141
■DHW heating with gas condensing system boiler .............................. 141
■Boosting DHW heating ....................................................................... 141
Internal extensions (accessories) .......................................................... 142
■Internal H1 extension ..........................................................................142
■Internal H2 extension ..........................................................................143
External extensions (accessories) ......................................................... 144
■AM1 extension ....................................................................................144
■EA1 extension .................................................................................... 145
Control functions ....................................................................................146
■External operating program changeover ............................................ 146
■External blocking ................................................................................ 147
■External demand ................................................................................ 147
■Venting program ................................................................................. 147
■Fill program .........................................................................................147
■Screed drying ..................................................................................... 148
■Raising the reduced room temperature .............................................. 149
■Reducing the heat-up time ................................................................. 150
Assigning heating circuits to the remote control .................................... 151
Vitocom 100, type GSM: Entering the PIN code via Vitotronic .............. 152
Hydronic balancing ................................................................................ 152
Electronic combustion control unit ......................................................... 152
11. Connection and wiring dia-
grams
Connection and wiring diagram – internal connections ......................... 154
Connection and wiring diagram – internal connections ......................... 155
12. Commissioning/service
reports
................................................................................................................156
13. Specification Specification .......................................................................................... 157
Index
Index
5812781

6
14. Disposal Final decommissioning and disposal ..................................................... 161
15. Certificates Declaration of conformity ....................................................................... 162
Manufacturer's certificate according to the 1st BImSchV [Germany] .... 163
16. Keyword index ................................................................................................................164
Index
Index (cont.)
5812781

7
Please dispose of packaging waste in line with statu-
tory regulations.
DE: Use the disposal system organised by
Viessmann.
AT: Use the ARA statutory disposal system (Altstoff
Recycling Austria AG, licence number 5766).
CH: Packaging waste is disposed of by the HVAC
contractor.
Symbols
Symbol Meaning
Reference to other document containing
further information
1.
Step in a diagram:
The numbers correspond to the order in
which the steps are carried out.
Warning of material losses and environ-
mental pollution
Live electrical area
Pay particular attention.
■Component must audibly click into place.
or
■Acoustic signal
■Fit new component.
or
■In conjunction with a tool: Clean the sur-
face.
Dispose of component correctly.
Dispose of component at a suitable collec-
tion point. Do not dispose of component in
domestic waste.
The steps in connection with commissioning, inspec-
tion and maintenance are found in the "Commission-
ing, inspection and maintenance" section and identified
as follows:
Symbol Meaning
Steps required during commissioning
Not required during commissioning
Steps required during inspection
Not required during inspection
Steps required during maintenance
Not required during maintenance
Intended use
The appliance is intended solely for installation and
operation in sealed unvented heating systems that
comply with EN 12828, with due attention paid to the
associated installation, service and operating instruc-
tions. It is only designed for heating up heating water
that is of potable water quality.
Intended use presupposes that a fixed installation in
conjunction with permissible, system-specific compo-
nents has been carried out.
Commercial or industrial usage for a purpose other
than heating the building or DHW shall be deemed
inappropriate.
Information
Disposal of packaging
5812781
Information

8
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 200-W, type B2HB, B2KB
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
■Hydraulics with 3-way diverter valve and variable
speed high efficiency circulation pump
■Vitotronic 200 for weather-compensated operation
■Integral diaphragm expansion vessel (10 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 200-W may only be delivered to coun-
tries listed 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.
Information
Intended use (cont.)
5812781
Information

9
Note
This boiler (IP rating: IP X4) is approved for installation
in wet rooms inside safety zone 1, to DIN VDE 0100.
Exposure to jets of water must be prevented.
For open flue operation, the boiler may only be oper-
ated with a splash cover.
Observe the requirements of DIN VDE 0100.
!Please note
To prevent appliance damage,
connect all pipework free of load and torque
stress.
800 350
812
a
1925
ABCDE F
M
A
375
HH
G
172
202
K50
100
L
Ø 60.5
Ø 96
450
-0.5
+0.8
Fig. 1
ACondensate drain
BHeating flow
CDHW (gas condensing combi boiler)
Cylinder flow (gas condensing system boiler)
DGas connection
ECold water (gas condensing combi boiler)
Cylinder return (gas condensing system boiler)
FHeating return
GFilling/draining
HRetainers for cables
KDrain outlet kit (accessories)
LPower supply area
MDimension for installation with DHW cylinder below
the boiler
Rated heating output
kW
Dim. a
mm
13 and 19 132
26 and 35 156
Preparing for installation
Preparing for installation
5812781
Installation

10
1. Fit the pre-plumbing jig or wall mounting bracket
from the installation accessories provided at the
chosen installation location.
Installation instructions for pre-plumbing jig
or installation accessories
Note
The screws and rawl plugs provided are designed
for concrete. For other construction materials, use
fixing materials with sufficient load bearing
capacity.
2. Prepare the water connections to the valves/fittings
of the pre-plumbing jig.
Thoroughly flush the heating system.
Note
To prevent dirt from entering the connections, do
not remove the protective caps until you are about
to fit the boiler.
Note
If an on-site expansion vessel also has to be instal-
led: Install this expansion vessel in the heating
flow, as the 3-way diverter valve is located in the
heating return.
3. Prepare the gas connection according to TRGI or
TRF [or local regulations].
4. Prepare the electrical connections.
■The appliance is delivered fitted with an approx.
1.5 m long power cable. Fuse max. 16 A, 230 V,
50 Hz.
■Accessory cables: 0.75 mm2 flexible PVC cable
with required number of cores for external con-
nections.
Connection on the DHW side for gas condensing combi boiler
Cold water installation
Fig. 2
ACold water connection, boiler
BDrain outlet
CVisible discharge pipe outlet point
DSafety valve
ENon-return valve
FShut-off valve
GCold water
HSafety assembly
A safety assembly H to DIN 1988 and EN 806 is
required if the mains water supply pressure exceeds
10 bar (1.0 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.
Shock arrestor
If draw-off points that could cause pressure peaks
(water hammer/shock) are connected to the same
pipework as the boiler (such as pressure washers,
washing machines or dishwashers), we would recom-
mend the installation of a shock arrestor near the
source of such pressure shocks.
g: Fit a small domestic expansion vessel if water
hammer occurs.
Preparing for installation
Preparing for installation (cont.)
5812781
Installation

11
Removing the front panel
1.
2x
2.
2.
Fig. 3
1. Unlock the front panel on the underside (push in),
using a screwdriver or similar tool.
2. Swivel the front panel forwards slightly and lift
away upwards.
Installation sequence
Mounting the boiler and making connections
5812781
Installation

12
4.
5.
4x
3.
6.
Fig. 4
3. Remove the installation kit from the gas pipe.
4. Remove the protective caps from the hydraulic
connections and gas connection.
Note
Do not remove the protective caps until you are
about to commence installation.
5. Fit the O-rings from the installation kit to the
hydraulic connections.
6. Lubricate the O-rings with the valve grease sup-
plied. Do not use any other agent.
Installation sequence
Mounting the boiler and making connections (cont.)
5812781
Installation

13
Fitting the boiler to the pre-plumbing jig
3.
4.
4x
1.
8.5.
2.
>0
0
Fig. 5
Note
The diagram shows installation on a surface mounted
pre-plumbing jig.
The boiler can be installed on the following accesso-
ries:
■Pre-plumbing jig for flush mounting
■Pre-plumbing jig for sub-mounting kit
■Mounting frame
■Self-supporting mounting frame
Note
The fitting assembly bears the full weight of the boiler.
1. Remove the protective caps from the hydraulic
connections and gas connection.
2. Take the flat gasket for the gas connection from the
installation kit. Place the flat gasket on the gas
shut-off valve or gas connector (pre-plumbing jig
for sub-mounting kit).
Installation sequence
Mounting the boiler and making connections (cont.)
5812781
Installation

14
3. Danger
Take care not to injure your hands.
Do not take hold of the boiler at the back of
the side panels. Hatched area in the dia-
gram.
Fitting the boiler:
■Align the boiler with the outer ends of the wall
mounting bracket.
■Lower the boiler vertically into position.
■The supporting surface of the boiler must rest on
the fitting assembly.
4. Take 4 screws from the installation kit and screw
them into the fitting assembly from below.
Torque 3 Nm. Never tighten the screws with a
cordless screwdriver.
Danger
Injury can be caused if the boiler is not ade-
quately secured.
Screws must be inserted to fasten the boiler
securely.
Note
When correctly installed, the boiler will not rest on
the hooks of the wall mounting bracket (see dia-
gram).
5. Tighten the union nut on the gas pipe.
Torque 30 Nm.
Connections on the heating water and DHW sides
A B C D FE
Fig. 6 Diagram shows connections for gas con-
densing combi boiler
AHeating flow G ¾
BDHW G ½ (gas condensing combi boiler)
Cylinder flow G ¾ (gas condensing system boiler)
CGas connection R ½
DCold water G ½ (gas condensing combi boiler)
Cylinder return G ¾ (gas condensing system
boiler)
EHeating return G ¾
FFilling/draining
If the connections have not been fitted previously,
make the connections on the heating water and DHW
sides.
Installation sequence
Mounting the boiler and making connections (cont.)
5812781
Installation

15
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 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.
Condensate connection
Fig. 7
1. Attach the supplied condensate hose to the trap.
2. Connect the condensate hose with a constant fall
and a pipe vent to the drain network or to a neutral-
ising system.
Note
Observe local waste water regulations.
Installation sequence
Flue gas connection
5812781
Installation

16
A
Fig. 8
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".
Opening the control unit enclosure
!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.
Installation sequence
Gas connection
5812781
Installation

17
2x
4x
2x
5.
2.
1.
3.
4.
6.
Fig. 9
Installation sequence
Opening the control unit enclosure (cont.)
5812781
Installation

18
L N
230V~ 230V~
96 40
1LN
145
2
1
5
40962035100
2 1 3 2 15 4 28
B
A
X21 X9
Fig. 10
ARadio clock receiver
BJumper
Connections to 230 V~ plugs
fÖ Power supply
lH ■Power supply for accessories
■External demand/blocking
Connections to LV plugs
X3 Plug X3 can be disconnected to facilitate installa-
tion.
!Outside temperature sensor
?Flow temperature sensor for low loss header
(accessories)
X21 CO limiter (accessories)
%Type B2HB:
Cylinder temperature sensor (supplied with DHW
cylinder connection set)
Type B2KB:
Comfort sensor (connected at the factory)
aVG KM-BUS subscriber (accessories)
To connect several accessories, see page 22.
■Vitotrol 200-A or 300-A remote control unit
■Vitocom 100, type GSM
■Mixer extension kit
■Solar control module, type SM1
■Vitosolic
■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.
Installation sequence
Electrical connections
5812781
Installation

19
Routing connecting cables/leads
1.
2.
A
B
2.
Fig. 11
ALV leads
B230 V cables
1. Take the cable retainers from the installation kit
and attach them to the fitting assembly.
2. Feed the cables through the cable retainers into
the control unit enclosure.
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
Installation sequence
Electrical connections (cont.)
5812781
Installation

20
Connecting the Vitoconnect 100 connecting cable (accessories)
3.
1.
2.
Fig. 12
Installing the Vitoconnect 100
Vitoconnect 100 installation and commissioning
instructions
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 value set
in parameter "9b" in the "General" group. The boiler
water temperature is limited by this set value and the
electronic maximum limit (parameter "06" in the
"Boiler" group).
!Please note
Live contacts lead to short circuits or phase fail-
ure.
The external connection must be potential-free
and meet the requirements of protection class II.
Installation sequence
Electrical connections (cont.)
5812781
Installation