Viessmann Vitovalor PT2 E11T Quick guide

Installation and service instructions
for contractors
VIESMANN
Vitovalor PT2
Type E11T, E19T, E25T, E32T, 0.9 to 30.8 kW
Fuel cell based micro CHP unit with integral gas condensing boiler and adjacent
cylinder module
Natural gas version
VITOVALOR PT2
5835783 GB 5/2019 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
5835783

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.)
5835783

4
1. Information Disposal of packaging ............................................................................ 7
Symbols ................................................................................................. 7
Intended use .......................................................................................... 7
Product information ................................................................................ 8
■Vitovalor PT2 ...................................................................................... 8
■Note on positioning ............................................................................. 8
2. Preparing for installation Handling ................................................................................................. 9
Siting ...................................................................................................... 9
■Dimensions of siting options ............................................................... 9
Preparing for installation ........................................................................ 12
Notes on connecting to the mains supply .............................................. 15
■Vitovalor PT2 in mains parallel mode ................................................. 15
■Metering generated power .................................................................. 15
■Property boundaries and transfer point without power storage sys-
tem ...................................................................................................... 17
■Property boundaries and transfer point with power storage system ... 18
■Connection for excess export without power storage system ............ 19
■Connection for excess export with power storage system ................. 21
■Fuse protection ................................................................................... 22
3. Installation sequence Installing and aligning the Vitovalor PT2 ................................................ 24
■Fitting the connection lines on the gas condensing and fuel cell
module ................................................................................................ 24
■Routing drain lines .............................................................................. 24
■Aligning the gas condensing and fuel cell module at the installation
site ...................................................................................................... 26
■Fitting the connection set (accessory) to the cylinder module ............ 27
■Aligning the cylinder module at the installation site ............................ 28
■Detaching the front panels of the gas condensing and fuel cell mod-
ules ..................................................................................................... 29
■Removing the cylinder module front panel ......................................... 30
■Removing the module connection lines .............................................. 31
Heating water and DHW connections .................................................... 31
■Safety assembly to DIN 1988 and EN 806 at the cold water connec-
tion ...................................................................................................... 32
Balanced flue terminal ........................................................................... 32
■Connecting the downstream balanced flue pipe ................................. 32
Condensate connection ......................................................................... 33
Gas connection ...................................................................................... 33
Opening the control unit enclosure on the gas condensing and fuel
cell module ............................................................................................. 34
Electrical connections ............................................................................ 34
■Connecting the cylinder module power supply and PlusBus .............. 35
■Connecting the cylinder module outlet temperature sensor ............... 36
■Outside temperature sensor ! .......................................................... 36
■Connection of floating switching contact ............................................ 36
■Cylinder module control unit ............................................................... 37
■Power supply for accessories (230 V ~) ............................................. 39
■Power supply to the system ................................................................ 40
■Routing connecting cables/leads ........................................................ 40
■Checking the CAN bus terminator setting .......................................... 41
Closing the control unit enclosure .......................................................... 41
Fitting the front panels of the gas condensing and fuel cell module ...... 42
■Fitting the programming unit ............................................................... 42
Fitting the cylinder module front panel ................................................... 43
Splitting the gas condensing and fuel cell modules ............................... 44
■Reassemble the gas condensing and fuel cell module in reverse
order. .................................................................................................. 46
Index
Index
5835783

5
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 47
5. System configuration
(parameters)
Calling up parameters ............................................................................ 83
General .................................................................................................. 83
Boiler ...................................................................................................... 85
DHW ...................................................................................................... 87
Heating circuit 1, Heating circuit 2, Heating circuit 3, Heating circuit 4 .. 88
Fuel cell ................................................................................................. 95
6. Diagnosis and service
checks
Gas condensing module ........................................................................ 97
■Service menu ...................................................................................... 97
■Changing the service password ......................................................... 97
■Resetting all passwords to the factory setting .................................... 98
■Diagnosis ............................................................................................ 98
■Checking outputs (actuator and sensor test) ...................................... 98
Fuel cell module .....................................................................................100
■Checking power generated .................................................................100
■Checking the gas consumption to reclaim fuel tax ............................. 101
■Checking operating condition ............................................................. 101
■Checking grid monitoring parameters .................................................101
■Removing the SD card ....................................................................... 102
■Inserting the SD card and saving the fuel cell module data ............... 102
7. Troubleshooting Fault indicator on the programming unit ................................................ 103
Fault messages for gas condensing module ......................................... 104
Fault codes, fuel cell module ................................................................. 126
Repairs .................................................................................................. 126
■Putting the control unit into the service position ................................. 126
■Draining the system on the heating water and DHW sides ................ 127
■Checking the temperature sensors .....................................................130
■Checking the cylinder loading plate heat exchanger .......................... 132
■Checking the system separation plate heat exchanger ...................... 132
■Removing the flow sensor .................................................................. 133
■Removing the hydraulic unit ............................................................... 134
■Replacing the power cable ................................................................. 134
■Checking the fuse ............................................................................... 135
■Mixer extension kit .............................................................................. 135
8. Parts lists Overview of gas condensing module and fuel cell module ....................137
Assembly, Vitovalor sheet metal sections ..............................................138
Casing assembly ................................................................................... 140
Heat cell assembly .................................................................................142
Heat cell module assembly ....................................................................144
Burner assembly ....................................................................................146
Vitovalor hydraulic assembly ................................................................. 148
Hydraulic assembly ................................................................................150
Control unit / electrical components assembly ...................................... 152
HMU/MCU/BCU (control unit and burner control unit) assembly ...........154
Mains distributor box assembly ............................................................. 156
HMI programming unit assembly ........................................................... 158
Fuel cell assembly ................................................................................. 160
Miscellaneous assembly ........................................................................162
Overview cylinder module ......................................................................165
Casing assembly DCF 180 D1 .............................................................. 168
Cylinder module PCB with mounting plate assembly ............................ 170
Cylinder module PCB assembly ............................................................ 172
Vitovalor hydraulics assembly ............................................................... 174
Hydraulics assembly, system separation circuit .................................... 176
Cylinder module assembly .....................................................................178
Index
Index
5835783

6
Cylinder assembly ................................................................................. 180
Vitovalor cylinder module assembly ...................................................... 182
Side mounting kit assembly ................................................................... 184
9. Function description Control unit ............................................................................................ 186
■Heating mode ..................................................................................... 186
■Heating the loading cylinder ............................................................... 186
■Operating the fuel cell module ............................................................ 186
Connection, heating circuit pump for heating circuit without mixer ........186
External extensions (accessories) ......................................................... 187
■EM-EA1 extension .............................................................................. 187
Control functions ....................................................................................187
■Venting program ................................................................................. 187
■Filling program .................................................................................... 188
■Screed drying ..................................................................................... 188
■Raising the reduced room temperature .............................................. 189
Electronic combustion controller of gas condensing module .................191
Electrical output of the fuel cell .............................................................. 192
10. Connection and wiring dia-
gram
Overview connection diagrams ..............................................................193
Mains distributor box ..............................................................................194
Connection diagram, gas condensing module control unit .................... 195
Connection diagram, burner control unit ................................................196
Connection diagram, cylinder module control unit .................................198
11. Commissioning/service
reports
................................................................................................................200
12. Specification ................................................................................................................201
13. Disposal Final decommissioning and disposal ..................................................... 202
14. Certificates Declaration of conformity ....................................................................... 203
Manufacturer's certificate according to the 1st BImSchV [Germany] .... 203
15. Keyword index ................................................................................................................204
Index
Index (cont.)
5835783

7
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 only intended to be installed and
operated 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 the heating of water that is
of potable water quality and for power generation.
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
5835783
Information

8
Incorrect usage or operation of the appliance (e.g. the
appliance being opened by the system user) is prohibi-
ted and results 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
Vitovalor PT2
Preset for operation with natural gas E, adjustable to
natural gas LL
The Vitovalor PT2 may in principle be supplied only to
the countries indicated on the type plate. For deliveries
to other countries, approved contractors must arrange
individual approval on their own initiative and in
accordance with the law of the country in question.
Note on positioning
If the Vitovalor PT2 is installed in close proximity to the
coast, the appliance should be positioned so that the
flue gas and ventilation air apertures do not come into
direct contact with saline air, in order to prevent dam-
age due to corrosion.
Do not install or operate the Vitovalor PT2 in unheated
rooms. Minimum temperature inside the installation
room +3 °C
Vitovalor PT2 in systems with photovoltaic and
solar thermal equipment
It is not possible to operate the Vitovalor PT2 in con-
junction with a solar thermal system. This would
reduce the runtimes of the Vitovalor PT2 and economi-
cally efficient operation would no longer be guaran-
teed.
If combining with a photovoltaic system, ensure that
the electricity meter is arranged correctly. An incor-
rectly arranged electricity meter would distort the stat-
istical data of the energy manager. This would reduce
the runtimes of the Vitovalor PT2 and economically
efficient operation would no longer be guaranteed.
Information
Intended use (cont.)
5835783
Information

9
Gas condensing and fuel cell module:
■If possible, leave the modules in their packaging dur-
ing handling.
■When transporting, keep upright at all times on the
pallet or its base.
■If possible, remove from pallet only at final location.
■Never subject the module to strong vibrations or
shaking.
■Always store standing up.
■May be tilted briefly, up to a maximum of 90°, during
handling. See following diagram.
!Please note
To prevent damage to the appliance, when
transporting up or down
stairs, always keep the underside of the appli-
ance lower than the top.
A
Fig. 1
AAppliance top
!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 space constraints make it necessary, the gas
condensing and fuel cell module can be split for
handling.
See page 44 for an illustration of the necessary
measures.
Siting
Dimensions of siting options
Install the Vitovalor so that one side of the cylinder
module is accessible for the water side connections on
the connection set.
No clearance is required behind the appliance.
Make sure there is sufficient space for the condensate
drain pipe opposite the cylinder module adjacent to the
gas condensing and fuel cell module.
Note
All height dimensions have a tolerance of +15 mm on
account of the adjustable feet.
Preparing for installation
Handling
5835783
Installation

10
Installation versions for room heights > 2030 mm
Cylinder module to the left of the gas condensing and fuel cell module
1800
185
475
1205
595
1240
1310
1829
1979 3°
1979 3°
A
Fig. 2
AWiring area
Note
Height of balanced flue terminal including balanced
flue pipe 1000 mm in length.
Preparing for installation
Siting (cont.)
5835783
Installation

11
Cylinder module to the right of the gas condensing and fuel cell module
1979
1800
125
185
595
1240
1310
1829
1979
3°
3°
1205
A
Fig. 3
AWiring area
Note
Height of balanced flue terminal including balanced
flue pipe 1000 mm in length.
Installation version for room heights ≥ 2000 mm
≤2030 mm
The cylinder module can only be installed to the right
of the gas condensing and fuel cell module.
A special balanced flue inspection bend (can be deliv-
ered on request) is required for this installation version.
Preparing for installation
Siting (cont.)
5835783
Installation

12
125
185
595
1205
1240
1310
1829
A
3°
1800
1920
Fig. 4
AWiring area
Preparing for installation
Use a connection set – available as an accessory – to
make the connections on the water side.
Fitting 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).
!Please note
Avoid damaging the appliance.
Connect all pipework free of load and torque
stress.
Preparing connections on site:
Connection set installation instructions
Preparing for installation
Siting (cont.)
5835783
Installation

13
1800
1826
1800
22 1205
190
595
A
300
B
C
352
Fig. 5
ACondensate drain
Observe the necessary fall.
BClearance for connections on the water side
CClearance for condensate drain pipe connection
Note
All height dimensions have a tolerance of +15 mm on
account of the adjustable feet.
Preparing for installation
Preparing for installation (cont.)
5835783
Installation

14
Connections on the water side with connection set (standard delivery)
1676
1621
1511
1456
1566
A
B
C
D
E
E
D
C
B
A
F
1882
G
F
62
110
Fig. 6
AHeating return R ¾
BCold water R ½
CDHW circulation R ½ (accessory)
DDHW R ½
EHeating flow R ¾
FManometer and drain valve
GGas shut-off valve
Depending on the layout of the modules: Connections
towards the free side on the cylinder module to the
right or left.
Note
All height dimensions have a tolerance of +15 mm on
account of the adjustable feet.
1. Prepare the connections on the heating water side.
Thoroughly flush the heating system.
Note
Fit the on-site expansion vessel (if required) to the
heating return.
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 32).
Recommendation:
Install the safety valve above the DHW cylinder.
This protects the valve against contamination, scal-
ing and high temperatures.
3. Prepare gas connection to TRGI [or local regula-
tions].
Preparing for installation
Preparing for installation (cont.)
5835783
Installation

15
4. Prepare electrical connections: See following chap-
ter.
The appliance is delivered fitted with a power cable
(approx. 2 m long).
!Please note
Switching off by means of an emergency
stop switch for the heating system can dam-
age the appliance.
Remove any emergency stop switches from
the existing heating system.
Accessory cables: Flexible cables with required
number of cores for external connections
Notes on connecting to the mains supply
Vitovalor PT2 in mains parallel mode
During operation of the Vitovalor PT2, any generated
power is fed into the building distribution system and/or
exported to the grid. This operating mode is described
as mains parallel mode. For this, the Vitovalor PT2 is
mechanically coupled to the grid.
Separate guidelines and regulations apply to this mode
of operation which must be taken into account when
making the electrical connection to the mains:
■Current technical connection conditions for connec-
tions to the LV grid. These connection conditions
must be obtained from the relevant power supply util-
ity.
■The applicable DIN VDE guidelines, specifically
DIN VDE 0100, Part 701, DIN VDE 0100-551,
DIN VDE 0126-1-1 and DIN VDE AR-N 4105
■Connect the power supply (230 V/50 Hz) via a per-
manent connection.
■Regulations on safety at work and those of appropri-
ate trade associations
■LV connection ordinances as well as supplementary
conditions of the relevant grid operator
■Any applicable statutory or local regulations
Notify the local grid operator before commissioning the
Vitovalor PT2. We recommend you contact the local
grid operator prior to installation and clarify any techni-
cal points as well as the acceptance procedure. Hand
the relevant application forms as per VDE AR-N 4105
[or local regulations] to the relevant grid operator.
Application forms [for German grid operators] are
available at www.viessmann.de.
Note
Different documentation may be required by grid oper-
ators in other regions.
Metering generated power
A net AC meter (Z2) is integrated into the
Vitovalor PT2. This meter captures total electrical
power generated, minus that consumed by the
Vitovalor PT2 itself. The meter is MID-calibrated and is
approved for billing according to DIN VDE AR-N
4105:2011-08 and the German CHP Act (KWKG).
The calibration of the integral meter is valid for 8 years.
After expiry of this time, the meter must be recalibrated
or be replaced by a qualified contractor. The power
supply utility must also be notified of any new meter.
Replace any existing main electricity meter installed in
the LV distribution board (meter cupboard) with a bal-
ancing bidirectional meter if excess power is exported
to the grid [check local regulations]. The change of
meter with all necessary formalities must be under-
taken by an authorised electrician in agreement with
the grid operator.
Preparing for installation
Preparing for installation (cont.)
5835783
Installation

16
Arrangement of excess export system when con-
nected into a sub-distribution board
RCDRCD
M400V / 230V~ N
L
K
HkWh
Z2
1~
BC
F
G
E
~
PO
kWh
Z1
kWh
A
D
S1
Fig. 7
AVitovalor PT2
BFuel cell module ON/OFF switch
CGas condensing module ON/OFF switch
DControl unit, gas condensing module
EInternal circulation pump
FInternal consumers
GGS protection
HSub-distribution board
KOn-site consumers
LMeter cupboard
MProperty boundary
NLow voltage grid
OInverter (DC/AC converter) SEMAX = 1.5 kVA
PFuel cell stack
S1 Bidirectional energy management meter (not rele-
vant for billing by the grid operator)
Z1 Balancing bidirectional meter
Z2 Export meter (standard delivery on Vitovalor PT2)
Arrangement of excess export when connected
into a main LV distribution board
RCDRCD
kWh
Z1
L
AC 400V / 230V~ M
K
HkWh
Z2
1~
F
G
E
kWh
S1
~
ON
BC
A
D
Fig. 8
AVitovalor PT2
BFuel cell module ON/OFF switch
CGas condensing module ON/OFF switch
DControl unit, gas condensing module
EInternal circulation pump
FInternal consumers
GGS protection
HMeter cupboard
KOn-site consumers
LProperty boundary
MLow voltage grid
NInverter (DC/AC converter) SEMAX = 1.5 kVA
OFuel cell stack
S1 Bidirectional energy management meter (not rele-
vant for billing by the grid operator)
Z1 Balancing bidirectional meter
Z2 Export meter (standard delivery on Vitovalor PT2)
Preparing for installation
Notes on connecting to the mains supply (cont.)
5835783
Installation

17
Property boundaries and transfer point without power storage system
B
C
D
E
F
G
K
L
Z2
1~
A
N
O
H
1~/N/PE
M
400V / 230V~
~
P
kWh
Z1
kWh
S1
kWh
Fig. 9 Source: VDE AR-N 4105
ALow voltage grid
BMain power supply
CDomestic distribution box
DProperty boundary
EGrid operator
FCustomer
GPower distribution
HOn-site consumers
KShort circuit protection
LOverload protection, RCD
MVitovalor PT2
NGS protection
OInverter (DC/AC converter) SEMAX = 1.5 kVA
PFuel cell
S1 Bidirectional energy management meter (not rele-
vant for billing by the grid operator)
Z1 Balancing bidirectional meter (observe meter cir-
cuit)
Z2 Export meter (standard delivery on Vitovalor PT2)
Preparing for installation
Notes on connecting to the mains supply (cont.)
5835783
Installation

18
Property boundaries and transfer point with power storage system
B
C
D
E
F
G
K
L
Z2
1~
A
N
O
H
1~/N/PE
M
400V / 230V~
~
P
kWh
Z1
kWh
S2
kWh
kWh
S1
~
U
V
Fig. 10 Source: VDE AR-N 4105
ALow voltage grid
BMain power supply
CDomestic distribution box
DProperty boundary
EGrid operator
FCustomer
GPower distribution
HOn-site consumers
KShort circuit protection
LOverload protection, RCD
MVitovalor PT2
NGS protection
OInverter (DC/AC converter) SEMAX = 1.5 kVA
PFuel cell
UPower storage system inverter
VPower storage unit
S1 Bidirectional power storage management meter
(power storage system standard delivery)
S2 Bidirectional energy management meter (not rele-
vant for billing by the grid operator)
Z1 Balancing bidirectional meter (observe meter cir-
cuit)
Z2 Export meter (standard delivery on Vitovalor PT2)
Preparing for installation
Notes on connecting to the mains supply (cont.)
5835783
Installation

19
Connection for excess export without power storage system
On-site energy consumption to paragraphs 33 and 4(3)
of the German CHP Act (KWKG)
B
C
D
E
F
G
K
L
Z3
A
N
O
H1~/N/PE
M
400V / 230V~
~
P
kWh
Z1
kWh
Z4
G
K
L
Z2
=
R
S
T
1~/N/PE
~
kWh
S1
kWh kWh
Fig. 11
ALow voltage grid
BMain power supply
CDomestic distribution box
DProperty boundary
EGrid operator
FCustomer
GPower distribution
HOn-site consumers
KShort circuit protection
LOverload protection, RCD
MVitovalor PT2
NGS protection
OInverter (DC/AC converter) SEMAX = 1.5 kVA
PFuel cell
RGS protection for PV system
SPV inverter
TPhotovoltaic system
S1 Bidirectional energy management meter (optional,
not relevant to billing by the grid operator)
Z1 Balancing bidirectional meter (observe meter cir-
cuit)
Electricity meter for power export and drawing
Preparing for installation
Notes on connecting to the mains supply (cont.)
5835783
Installation

20
Z2 Export meter for PV system power generation
Z3 Export meter for power generation by
Vitovalor PT2 (standard delivery with
Vitovalor PT2)
Z4 Export meter for Vitovalor PT2 alone
Preparing for installation
Notes on connecting to the mains supply (cont.)
5835783
Installation