Fuse Protection - Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors

Preparing for installation
Notes on connecting to the mains supply
GS protection for PV system
R
PV inverter
S
Photovoltaic system
T
Power storage system inverter
U
V Power storage unit
S1 Bidirectional power storage management meter
(power storage system standard delivery)
S2 Bidirectional energy management meter (optional,
not relevant to billing by the grid operator)

Fuse protection

The Vitovalor PT2 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 PT2 is protected by a circuit breaker (MCB).
Depending on the nature of the domestic grid (TT sys-
tem), or as required by DIN VDE 0100-410, a residual
current device (RCD) may also be required.
We recommend installing an AC/DC-sensitive RCD
(RCD class B) for DC (fault) currents that can occur
with energy efficient equipment.
B
kWh
A
S1
RCD
kWh
Z1
D
Fig. 13 Example: Selective sizing of the protective
devices
RCD (on site) e.g. 40 A/0.5 A, 4-pole
A
On-site consumers
B
Fuse/MCB to the sub-distribution board, e.g.
C
3 x 35 A
Selective mains circuit breaker 3 x 63 A
D
On-site consumers
E
RCD Vitovalor PT2 25 A/30 mA, single pole (if
F
required)
Vitovalor PT2
G
Gas condensing module ON/OFF switch
H
Control unit, gas condensing module
K
24
E
RCD RCD
F
C
P
(cont.)
Z1 Balancing bidirectional meter (observe meter cir-
cuit)
Electricity meter for power export and drawing
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
The Vitovalor PT2 must not be installed in the same
final consumer circuit as other consumers.
!
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.
G
K
H
kWh
Z2
L
1~
M
N O
~
400V / 230V~ R
Internal circulation pump
L
GS protection
M
Inverter (DC/AC converter) S
N
Fuel cell stack
O
Property boundary
P
Low voltage grid
R
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)
= 0.75 kVA
EMAX