Viessmann Vitocal 300-G Installation And Service Instructions Manual page 44

Installation sequence
Power supply
(cont.)
2-stage (type BW 301.B + BWS 301.B)
X3.7
A
X3.6
3
≈
3
kWh
E
3/N
D
F
4
Fig. 34 Shown without fuses and RCDs
Heat pump control unit (connection on cross con-
A
nect PCB)
Instantaneous heating water heater (if installed)
B
Compressor, heat pump stage 1 (type BW 301.B)
C
Premium tariff meter
D
Ripple control receiver (contact open: Power-OFF
E
enabled)
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. When power-OFF is enabled,
the compressor and the instantaneous heating water
heater (if installed) are "forced" off; in the 2-stage ver-
sion (type BW 301.B + BWS 301.B), this applies to
both compressors and the instantaneous heating
water heater.
44
B
C
5
3
kWh
3/N
H
4
4
G
K
4 4
Backup fuse, ripple control receiver
F
Feed: TNC system
G
H Economy tariff meter
Compressor, heat pump stage 2 (type BWS 301.B)
K
Note
Observe the technical connection conditions of the rel-
evant power supply utility.