Viessmann Vitovalor 300-P Operating instructions

Installation and service instructions
for contractors
VIESMANN
Vitovalor 300-P
Type C3TB, 1 to 20 kW
Micro CHP unit based on a fuel cell with integral gas condensing boiler
Natural gas version
For applicability, see the last page
VITOVALOR 300-P
5775 636 GB 1/2016 Please keep safe.

2
Please follow these safety instructions closely to
prevent accidents and material losses.
Safety instructions explained
Danger
This symbol warns against the risk of injury.
!Please note
This symbol warns against the risk of material
losses and environmental pollution.
Note
Details identified by the word "Note" contain additional
information.
Target group
These instructions are exclusively intended for quali-
fied contractors.
■Work on gas installations must only be carried out by
a registered gas fitter.
■Work on electrical equipment must only be carried
out by a qualified electrician.
■The system must be commissioned by the system
installer or a qualified person authorised by the
installer.
Regulations to be observed
■National installation regulations
■Statutory regulations for the prevention of accidents
■Statutory regulations for environmental protection
■Codes of practice of the relevant trade associations
■All current safety regulations as defined by DIN, EN,
DVGW, TRGI, TRF, VDE and all locally applicable
standards
aÖNORM, EN, ÖVGW-TR Gas, ÖVGW-TRF and
ÖVE
cSEV, SUVA, SVGW, SVTI, SWKI, VKF and
EKAS guideline 1942: LPG, part 2
Safety instructions for working on the system
Working on the system
■Where gas is used as the fuel, close the main gas
shut-off valve and safeguard it against unintentional
reopening.
■Isolate the system from the power supply, e.g. by
removing the separate fuse or by means of a mains
isolator, and check that it is no longer 'live'.
■Safeguard the system against reconnection.
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.
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.
Safety instructions
Safety instructions
5775 636 GB

3
What to do if water escapes from the appliance
Danger
When water escapes from the appliance there is
a risk of electrocution.
Switch off the heating system at the external iso-
lator (e.g. fuse box, domestic power distribu-
tion).
Flue systems and combustion air
Ensure that flue systems are clear and cannot be
sealed, for instance due to accumulation of conden-
sate or other causes. Ensure an adequate supply of
combustion air.
Instruct system users that subsequent modifications to
the building characteristics are not permissible (e.g.
cable/pipework routing, cladding or partitions).
Danger
Leaking or blocked flue systems, or an inade-
quate supply of combustion air can cause life
threatening poisoning from carbon monoxide in
the flue gas.
Ensure the flue system is in good working order.
Vents for supplying combustion air must be non-
closable.
Extractors
Operating appliances that extract air to the outside
(cooker hoods, extractors, air conditioning units, etc.)
can create negative pressure. If the boiler is operated
at the same time, this can lead to reverse flow of the
flue gas.
Danger
The simultaneous operation of the boiler and
appliances that extract air to the outside can
result in life threatening poisoning due to
reverse flow of the flue gas.
Fit an interlock circuit or take suitable steps to
ensure an adequate supply of combustion air.
Safety instructions
Safety instructions (cont.)
5775 636 GB

4
1. Information Disposal of packaging ............................................................................ 7
Symbols ................................................................................................. 7
Intended use .......................................................................................... 7
Product information ................................................................................ 8
■Vitovalor 300-P, type C3TB ................................................................. 8
■Note on positioning ............................................................................. 8
2. Preparing for installation Handling ................................................................................................. 9
■Fuel cell module ................................................................................. 9
■Gas condensing module ..................................................................... 9
Siting ...................................................................................................... 9
■Dimensions of siting options ............................................................... 10
Preparing for installation ........................................................................ 11
Notes on connecting to the mains supply .............................................. 14
■Vitovalor 300-P in mains parallel mode .............................................. 14
■Metering generated power .................................................................. 14
■Property boundaries and transfer point without power storage sys-
tem ...................................................................................................... 16
■Property boundaries and transfer point with power storage system ... 17
■Connection for excess export without power storage system ............ 18
■Connection for excess export with power storage system ................. 19
■Cable sizing ........................................................................................ 20
■Fuse protection ................................................................................... 20
3. Installation sequence Installing the Vitovalor 300-P ................................................................. 22
■Removing the front panel of the gas condensing module .................. 22
■Connecting the fuel cell module on the heating water and gas sides . 23
■Mounting the diaphragm expansion vessel ........................................ 24
■Aligning the Vitovalor 300-P ............................................................... 25
■Heating water and DHW connections ................................................. 26
■Balanced flue terminal ........................................................................ 27
■Routing drain lines .............................................................................. 29
■Gas connection ................................................................................... 29
Opening the control unit enclosure on the gas condensing module ...... 30
Electrical connections ............................................................................ 31
■Vitotronic 200 ...................................................................................... 31
■Process controller ............................................................................... 32
■Making the electrical connection between the fuel cell module and
the gas condensing module ................................................................ 34
■Outside temperature sensor ! (hard-wired) ..................................... 35
■External demand via switching contact .............................................. 35
■External demand via 0 – 10 V input .................................................... 36
■External blocking via switching contact .............................................. 36
■Power supply for accessories (230 V ~) ............................................. 37
■KM-BUS connections ......................................................................... 38
■Connecting Vitocom 300 to LAN ......................................................... 39
■Power supply to the system ................................................................ 39
■Installing wireless accessories (if present) ......................................... 41
■Routing the connecting cables and leads ........................................... 42
Closing the control unit enclosure .......................................................... 42
■Closing the process controller ............................................................ 43
Fitting the front panels ........................................................................... 44
If required for easier handling: Dismantling the gas condensing mod-
ule .......................................................................................................... 45
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 50
Index
Index
5775 636 GB

5
5. Codes Coding level 1 ........................................................................................ 92
■Calling up coding level 1 ..................................................................... 92
■"General" ........................................................................................... 92
■"Boiler" .............................................................................................. 93
■"DHW" ................................................................................................ 94
■"Heating circuit ..." ........................................................................... 94
Coding level 2 ........................................................................................ 98
■Calling up coding level 2 ..................................................................... 98
■"General" ........................................................................................... 98
■"Boiler" .............................................................................................. 103
■"DHW" ................................................................................................103
■"Heating circuit ..." ........................................................................... 105
6. Diagnosis and service
scans
Gas condensing module ........................................................................ 110
■Service menu ...................................................................................... 110
■Diagnosis ............................................................................................ 111
■Checking outputs (actuator test) ......................................................... 112
Fuel cell module .....................................................................................113
■Calling up power generated ................................................................ 113
■Calling up operating condition ............................................................ 113
■Calling up grid monitoring parameters ................................................ 113
■Resetting fuel cell module data .......................................................... 114
7. Troubleshooting Fault display on gas condensing module ...............................................115
Fault codes for gas condensing module ................................................ 115
Fault display, fuel cell module ................................................................122
■Fault messages .................................................................................. 123
Repairs (gas condensing module) ......................................................... 123
■Putting the control unit into the service position ................................. 123
■Draining the system on the heating water and DHW sides ................ 123
■Checking the outside temperature sensor ..........................................126
■Checking the boiler water temperature sensor, cylinder temperature
sensor or flow temperature sensor of low loss header ....................... 127
■Checking the outlet temperature sensor .............................................128
■Checking the return temperature sensor ............................................ 129
■Checking the buffer temperature sensor ............................................ 130
■Checking the plate heat exchanger .................................................... 130
■Checking the flue gas temperature sensor .........................................131
■Checking the temperature limiter ........................................................133
■Checking the fuse/MCB ......................................................................134
■Mixer extension kit ..............................................................................134
■Checking the Vitotronic 200-H (accessories) ......................................135
8. Parts lists Overview of assemblies .........................................................................137
Casing assembly ................................................................................... 138
Heat cell assembly .................................................................................140
Burner assembly ....................................................................................144
Heat cell hydraulic assembly ................................................................. 146
External connection assembly ............................................................... 148
Buffer cylinder assembly ........................................................................150
DHW cylinder assembly .........................................................................152
Miscellaneous assembly ........................................................................154
Vitovalor VBC 132 control unit assembly ...............................................156
Vitovalor VUC 170 control unit assembly .............................................. 158
Fuel cell assembly ................................................................................. 160
Index
Index
5775 636 GB

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9. Function description Control unit ............................................................................................ 164
■Heating mode ..................................................................................... 164
■Heating the DHW loading cylinder from cold ......................................164
■Operating the fuel cell module ............................................................164
■Reheating when DHW is drawn off .....................................................164
■Boosting DHW heating ....................................................................... 165
Internal H1 extension (standard delivery) .............................................. 165
Internal H2 extension (accessories) ...................................................... 166
External extensions (accessories) ......................................................... 167
■AM1 extension ....................................................................................167
■EA1 extension .................................................................................... 168
Control functions ....................................................................................169
■External operating program changeover ............................................ 169
■External blocking ................................................................................ 170
■External demand ................................................................................ 170
■Venting program ................................................................................. 171
■Fill program .........................................................................................171
■Screed drying ..................................................................................... 171
■Raising the reduced room temperature .............................................. 173
■Reducing the heat-up time ................................................................. 174
Assigning heating circuits to the remote control .................................... 175
Electronic control unit on the peak load boiler ....................................... 176
10. Connection and wiring dia-
gram
Connection diagram, internal (gas condensing module) ....................... 177
Connection diagram, external (gas condensing module) ...................... 178
Differential temperature controller ......................................................... 179
11. Commissioning/service
reports
................................................................................................................180
12. Specification ................................................................................................................181
13. Disposal Final decommissioning and disposal ..................................................... 182
14. Certificates Declaration of conformity ....................................................................... 183
Manufacturer's certificate according to the 1st BImSchV [Germany] .... 183
15. Keyword index ................................................................................................................184
Index
Index (cont.)
5775 636 GB

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Please dispose of packaging waste in line with statu-
tory regulations.
DE: Use the disposal system organised by
Viessmann.
AT: Use the ARA statutory disposal system (Altstoff
Recycling Austria AG, licence number 5766).
CH: Packaging waste is disposed of by the HVAC
contractor.
Symbols
Symbol Meaning
Reference to other document containing
further information
1.
Step in a diagram:
The numbers correspond to the order in
which the steps are carried out.
Warning of material losses and environ-
mental pollution
Live electrical area
Pay particular attention.
■Component must audibly click into place.
or
■Acoustic signal
■Fit new component.
or
■In conjunction with a tool: Clean the sur-
face.
Dispose of component correctly.
Dispose of component at a suitable collec-
tion point. Do not dispose of component in
domestic waste.
The steps in connection with commissioning, inspec-
tion and maintenance are found in the "Commission-
ing, inspection and maintenance" section and identified
as follows:
Symbol Meaning
Steps required during commissioning
Not required during commissioning
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.
Information
Disposal of packaging
5775 636 GB
Information

8
Commercial or industrial usage for a purpose other
than heating the building or DHW shall be deemed
inappropriate.
Any usage beyond this must be approved by the man-
ufacturer in each individual case.
Incorrect usage or operation of the appliance (e.g. the
appliance being opened by the system user) is prohibi-
ted and 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 300-P, type C3TB
Preset for operation with natural gas E, adjustable to
natural gas LL
The Vitovalor 300-P may in principle be supplied only
to the countries indicated on the type plate. For deliv-
eries 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
When the Vitovalor 300-P is installed close to the
coast, it should be positioned such that the flue gas
and ventilation air apertures do not come into direct
contact with saline air, in order to prevent damage due
to corrosion.
Minimum temperature inside the installation room
+3 °C
Vitovalor 300-P in systems with photovoltaic and
solar thermal equipment
Operating the Vitovalor 300-P in conjunction with a
photovoltaic or solar thermal system is not recommen-
ded. An integral PV system would falsify the statistical
data of the energy manager as it is not designed for
such a combination. Vitovalor 300-P runtimes could be
reduced and economically efficient operation would no
longer be guaranteed. The same applies if the
Vitovalor 300-P is operated in conjunction with a solar
thermal system or any additional heat generator. The
integral heating water buffer cylinder would be heated
additionally which would, in turn, reduce the
Vitovalor 300-P runtime. If the Vitovalor 300-P is nev-
ertheless operated in conjunction with a photovoltaic or
solar thermal system, a higher ranking energy man-
ager must be provided on site.
Information
Intended use (cont.)
5775 636 GB
Information

9
If possible, leave the fuel cell module and the gas con-
densing module on their pallet during handling.
Fuel cell module
■When transporting the fuel cell module, keep it upright
at all times on the pallet or its base.
■On delivery, check the tilt indicators on the packaging:
If the tilt angle on delivery is ≥ 60°, reject the delivery
but notify Viessmann.
■If possible, only remove the fuel cell module from its
pallet once it is at its final installation site. Undo the
screws and remove the transport locking plates.
Fig. 1
■Never subject the fuel cell module to strong vibrations
or shaking.
■For easier handling, the fuel cell module may be tilted
up to 90°. See following diagram. Store the fuel cell
module upright.
!Please note
To prevent damage to the appliance, when
transporting up or down stairs, always keep
the underside of the appliance lower than the
top.
A
Fig. 2
AAppliance top
Gas condensing module
!Please note
Prevent damage to the appliance during han-
dling.
Never lay the gas condensing module on its
front or side, or subject it to pressure.
If space constraints make it necessary, the gas
condensing module can be split for handling.
See page 45 for an illustration of the necessary
measures.
Siting
Room height required: min. 2250 mm The Vitovalor 300-P must be installed with the gas
condensing module downstream of the fuel cell mod-
ule in the flue gas flow direction.
Preparing for installation
Handling
5775 636 GB
Installation

10
Dimensions of siting options
2250
1085
5
134
2147
2082
237
595
Fig. 3 Fuel cell module to the left of the gas con-
densing module
Preparing for installation
Siting (cont.)
5775 636 GB
Installation

11
1125
5
40
237
134
2082
2147
2250
20
595
Fig. 4 Fuel cell module to the right of the gas con-
densing module
Preparing for installation
Use a connection set – available as an accessory – to
make the connections on the gas and water sides.
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 sets).
!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.)
5775 636 GB
Installation

12
1932
1998
1667
1766
595
29
Ø 40
177
1139
A
Fig. 5
ACondensate drain in the wall
Observe the necessary fall.
480
398
237
456
595
377
516
191
5
1085
496
1085
5480
377
516
237
595
898
456
104 83
B C
Fig. 6
BFuel cell module to the right of the gas condensing
module
CFuel cell module to the left of the gas condensing
module
Note
All height dimensions have a tolerance of +15 mm on
account of the adjustable feet.
Preparing for installation
Preparing for installation (cont.)
5775 636 GB
Installation

13
Connecting gas and water using connection sets (accessories)
110
165
50 1496
110
165
1551
1661
1771
1826
1932
320
362
398
410
1982
1998
2020
2030
1606
1716
1951
48
Fig. 7 All possible connection sets are shown (con-
nection to the right, left or top).
1. Prepare the connections on the heating water side.
See page 26.
Thoroughly flush the heating system.
Note
Fit the on-site expansion vessel to the heating
return.
2. Prepare the connections on the DHW side. Install
the safety assembly (accessory or on-site provi-
sion) in the cold water line to DIN 1988 and
EN 806 (see page 26).
Recommendation:
Install the safety valve above the DHW cylinder.
This protects the valve against soiling, scaling and
high temperatures.
3. Prepare the connection from the fuel cell module
and from the gas condensing module to on-site
drain or trap:
See diagram on page 12.
4. Prepare gas connection to TRGI [or local regula-
tions].
5. Prepare electrical connections: see following chap-
ter.
!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: NYM with the required number
of cores for external connections.
Preparing for installation
Preparing for installation (cont.)
5775 636 GB
Installation

14
Vitovalor 300-P in mains parallel mode
During operation of the Vitovalor 300-P, 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 300-P 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 300-P. 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 300-P. This meter captures total electrical
power generated, minus that consumed by the
Vitovalor 300-P itself. The meter is MID-calibrated and
is approved for billing according to DIN VDE AR-N
4105:2011-08 and the German Combined Heat and
Power Generation 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.
Any existing main electricity meter installed in the LV
distribution board (meter cupboard) must be replaced
with a balancing bi-directional meter if excess power is
exported to the grid [check local regulations]. The
change of meter with all necessary formalities must be
undertaken by an authorised electrician in agreement
with the grid operator.
Preparing for installation
Notes on connecting to the mains supply
5775 636 GB
Installation

15
Arrangement of excess export system when con-
nected into a sub-distribution board
RCDRCD
K400 V / 230 V~L
H
G
FkWh
Z2
1~
E
A
C
D
B
~
NM
kWh
Z1
kWh
Z3
Fig. 8
AVitovalor 300-P
BInternal circulation pump
CInternal consumers
DGS protection
EON/OFF switch
FSub-distribution board
GOn-site consumers
HMeter cupboard
KProperty boundary
LLow voltage grid
MInverter (DC/AC converter) SEMAX = 1.5 kVA
NFuel cell stack
Z1 Balancing bi-directional meter
Z2 Net electricity meter (standard delivery
Vitovalor 300-P)
Z3 Bi-directional energy management (not relevant for
billing by the grid operator)
Arrangement of excess export when connected
into a main LV distribution board
RCDRCD
kWh
Z1
HAC 400 V / 230 V~
K
G
FkWh
Z2
1~
E
A
C
D
B
kWh
Z3
~
NM
Fig. 9
AVitovalor 300-P
BInternal circulation pump
CInternal consumers
DGS protection
EON/OFF switch
FMeter cupboard
GOn-site consumers
HProperty boundary
KLow voltage grid
MInverter (DC/AC converter) SEMAX = 1.5 kVA
NFuel cell stack
Z1 Balancing bi-directional meter
Z2 Net electricity meter (standard delivery
Vitovalor 300-P)
Z3 Bi-directional energy management (not relevant for
billing by the grid operator)
Preparing for installation
Notes on connecting to the mains supply (cont.)
5775 636 GB
Installation

16
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
400 V / 230 V~
~
P
kWh
Z1
kWh
Z3
kWh
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 300-P
NGS protection
OInverter (DC/AC converter) SEMAX = 1.5 kVA
PFuel cell
Z1 Balancing bi-directional meter (observe meter cir-
cuit)
Z2 Net electricity meter (standard delivery
Vitovalor 300-P)
Z3 Bi-directional energy management (not relevant for
billing by the grid operator)
Preparing for installation
Notes on connecting to the mains supply (cont.)
5775 636 GB
Installation

17
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
400 V / 230 V~
~
P
kWh
Z1
kWh
Z3
kWh
kWh
Z4
~
U
V
Fig. 11 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 300-P
NGS protection
OInverter (DC/AC converter) SEMAX = 1.5 kVA
PFuel cell
UPower storage system inverter
VPower storage unit
Z1 Balancing bi-directional meter (observe meter cir-
cuit)
Z2 Net electricity meter (standard delivery
Vitovalor 300-P)
Z3 Bi-directional energy management (not relevant for
billing by the grid operator)
Z4 Power storage management bi-directional meter
(power storage system standard delivery)
Preparing for installation
Notes on connecting to the mains supply (cont.)
5775 636 GB
Installation

18
Connection for excess export without power storage system
On-site energy consumption to paragraphs 33 and 4(3)
KWK [Germany]
B
C
D
E
F
G
K
L
Z2b
A
N
O
H1~/N/PE
M
400 V / 230 V~
~
P
kWh
Z1
kWh
Z3
kWh
Z3b
G
K
L
Z2a
=
R
S
T
1~/N/PE
~
Fig. 12
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 300-P
NGS protection
OInverter (DC/AC converter) SEMAX = 1.5 kVA
PFuel cell
RGS protection for PV system
SPV inverter
TPhotovoltaic system
Z1 Balancing bi-directional meter (observe meter cir-
cuit)
Electricity meter for power export and drawing
Z2a Export/generation meter, PV system power gen-
eration
Z2b Export/generation meter for power generation by
Vitovalor 300-P (standard delivery with
Vitovalor 300-P)
Z3 Bi-directional energy management meter
(optional, not relevant to billing by the grid opera-
tor)
Z3b Export/generation meter for Vitovalor 300-P alone
Preparing for installation
Notes on connecting to the mains supply (cont.)
5775 636 GB
Installation

19
Connection for excess export with power storage system
On-site energy consumption to paragraphs 33 and 4(3)
KWK [Germany]
B
C
D
E
F
G
K
L
Z2b
A
N
O
H1~/N/PE
M
400 V / 230 V~
~
P
kWh
Z1
kWh
Z3
kWh
Z3b
G
K
L
Z2a
=
R
S
T
1~/N/PE
~
kWh
Z4
~
U
V
kWh
Fig. 13
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 300-P
NGS protection
OInverter (DC/AC converter) SEMAX = 1.5 kVA
PFuel cell
RGS protection for PV system
SPV inverter
TPhotovoltaic system
UPower storage system inverter
VPower storage unit
Z1 Balancing bi-directional meter (observe meter cir-
cuit)
Electricity meter for power export and drawing
Preparing for installation
Notes on connecting to the mains supply (cont.)
5775 636 GB
Installation

20
Z2a Export/generation meter, PV system power gen-
eration
Z2b Export/generation meter for power generation by
Vitovalor 300-P (standard delivery with
Vitovalor 300-P)
Z3 Bi-directional energy management meter
(optional, not relevant to billing by the grid opera-
tor)
Z3b Export/generation meter for Vitovalor 300-P alone
Z4 Power storage management bi-directional meter
(power storage system standard delivery)
Cable sizing
Inadequate cross-sections result in yield losses when
generating power. Consequently, select larger cross-
sections for the Vitovalor 300-P power cable than is
technically required. Cross-sections recommended in
line with economic considerations:
Cable lengths in m Recommended cable
≤ 35 NYM 3 x 2.5 mm2
> 35 ≤ 55 NYM 3 x 4 mm2
> 55 ≤ 80 NYM 3 x 6 mm2
Fuse protection
The Vitovalor 300-P has been factory-tested as a unit
that is ready for connection. Only an adequately sized
power cable needs to be connected on site. This cable
should be routed either to the main LV distribution
board (mains distribution or meter cupboard) or to the
nearest suitable sub-distribution board. The
Vitovalor 300-P is protected by a mains isolator.
Depending on the nature of the domestic grid, or as
required by DIN VDE 0100-410, a residual current
device (RCD) may also be required.
!Please note
Switching off by means of an emergency stop
switch for the heating system can damage the
appliance.
Remove any emergency stop switches from the
existing heating system.
Mains isolator:
■B response characteristics
■1-pole
■Response current 10 A
■Design breaking capacity to EN 60898: 10 kA
■Design voltage 230 V/400 V∼
RCD:
■RCD 25 A
■2-pole
■Response current 10 A
■For AC and pulsating DC fault currents
■Design residual current 30 mA
■Design voltage 230/400 V∼
■Surge current resistance 1 kA
Never install the Vitovalor 300-P downstream of exist-
ing fuses/MCBs. In the case of a consumer short cir-
cuit there is a risk that high currents may flow which
are impermissible and load the cables to excess.
During installation, the electrician must also test the
selectivity of the residual current device (RCD) and the
protective equipment (overload/short circuit protection)
Preparing for installation
Notes on connecting to the mains supply (cont.)
5775 636 GB
Installation