Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 56

Installation sequence
Power supply
(cont.)
Mains power supply in conjunction with on-site power consumption
Without power-OFF
A
F
G
kWh
L
M
N
Fig. 54
Heat pump
A
Additional consumers (of power generated on site)
B
in the household
Electricity meter
C
Inverter
D
Isolator for the PV system
E
F Terminal
Double-tariff meter (for special tariff for heat pump)
G
Not permissible in conjunction with PV systems for
on-site power consumption
Smart Grid
The Smart Grid functions are switched via both PSU
■
floating contacts.
■ Both floating contacts are connected to the EA1
extension in accordance with Fig. 55.
56
B
A
C
F
N E1E2 D /D
F
L1 L1 L2 L2 L3 L3
H
kWh
L
N
~ ~
=
D
E
F
K
kWh
M
Bi-directional meter (for PV systems to consume
H
power on site):
Energy taken from power supply utility and energy
fed into power supply utility
Meter with reverse block:
K
For energy generated by PV system
Isolator for the domestic power supply connection
L
(distribution panel)
Distribution panel
M
Domestic distribution box
N