Viessmann Vitocal 300-G Series Installation And Service Instructions Manual page 38

Installation sequence
Power supply
(cont.)
1-stage (type BW 301.A)
X3.7
A
X3.6
3
D
E
≈
3
kWh
3/N
F G
4
Fig. 26 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
Control unit power supply
D
Mains isolator
E
38
C
B
5
3
kWh
3/N
H
4
4
K
F
G
H
K
4
Premium tariff meter
Ripple control receiver (contact open: Power-OFF
enabled) with backup fuse
Economy tariff meter
Feed: TNC system