Power Supply With Power-Off: With On-Site Load Disconnect - Viessmann Vitocal 300-G Series Installation And Service Instructions Manual

Power supply
(cont.)
2-stage (type BW 301.A + BWS 301.A)
X3.7
A
X3.6
3
≈
3
kWh
E
3/N
D
F
4
Fig. 25 Diagram excluding 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.A)
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 (types BW + BWS) both compressors and the
instantaneous heating water heater are switched off.
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.A)
K
Note
Observe the technical connection conditions of the rel-
evant power supply utility.
Installation sequence
37