Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 111

Power supply
(cont.)
Power-OFF with on-site load disconnection
The power-OFF signal is connected to
the on-site contactor of the low tariff
power supply and in the heat pump con-
trol unit (heat pump type BW). When
power-OFF is enabled, both compres-
sors (type BW+BWS) and the instanta-
neous heating water heater (on site) are
forced OFF.
Single stage (type BW)
X3.7
A
D
E
3
kWh
3/N
F G
4
Diagram excluding fuses and RCD.
A Heat pump control unit (for connec-
tion on cross connect PCB, see
page 225)
X3.6
3
≈
4
K
Installation sequence
Note
Observe the technical connection condi-
tions of the relevant power supply util-
ity.
C
B
5
3
kWh
3/N
H
4
B Instantaneous heating water heater
(on site)
C Heat pump compressor (type BW)
4
111