Viessmann Vitocal 300-G Series Installation And Service Instructions Manual page 36

Installation sequence
Power supply
(cont.)
1-stage (type BW 301.A)
X3.7
A
X3.6
3
3
kWh
E
3/N
D
4
Fig. 24 Diagram excluding fuses and RCDs.
Heat pump control unit (connection on cross con-
A
nect PCB)
Instantaneous heating water heater (if installed)
B
Compressor
C
Premium tariff meter
D
36
B
≈
F
4
G
C
5 4
3
kWh
3/N
H
4
Ripple control receiver (contact open: Power-OFF
E
enabled)
Backup fuse, ripple control receiver
F
Feed: TNC system
G
Economy tariff meter
H