Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors page 43

Power supply
(cont.)
Power supply with power-OFF: With on-site load disconnect
The power-OFF signal is connected to the on-site con-
tactor of the economy tariff power supply and to the
heat pump control unit. The compressor and instanta-
neous heating water heater are "forced" off when
power-OFF is enabled.
Note
Observe the technical connection conditions of the rel-
evant power supply utility.
A
X3.7
X3.6
X40
3
K
≈
3
kWh
3/N
G
H
F
4
Fig. 33 Diagram excluding fuses and RCD
Heat pump control unit
A
Instantaneous heating water heater
B
Compressor
C
Economy tariff meter
D
E Feed: TNC system
Backup fuse, ripple control receiver
F
Ripple control receiver (contact open: Power-OFF
G
enabled)
Premium tariff meter
H
Mains isolator
K
Installation sequence
B C
5 5
3
kWh
3/N D
4
4
E
43