Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 96

Installation sequence
Power supply
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 (type BW). When power-OFF is
enabled, both compressors (type BW +
BWS) and the instantaneous heating
water heater (on site) are "forced" OFF.
Single stage (type BW)
A
D
E
3
kWh
3/N
F G
4
Diagram excluding fuses and RCD
A Heat pump control unit (connection
on cross connect PCB)
B Instantaneous heating water heater
(on site)
96
(cont.)
X3.7
X3.6
3
≈
K
Note
Observe the technical connection condi-
tions of the relevant power supply util-
ity.
B
5
3
kWh
3/N
H
4
4
C Compressor (type BW)
D Control unit power supply
E Mains isolator
F High tariff meter
C
4