Viessmann Vitocal 300-G Installation And Service Instructions Manual page 97

Power supply
(cont.)
Single stage
X3.7
A
X3.6
3
3
kWh
E
3/N
D
4
Diagram excluding fuses and RCD.
A Heat pump control unit (connection
on cross connect PCB)
B Instantaneous heating water heater
(accessory)
C Compressor
D High tariff meter
B
≈
F
4
G
E Ripple control receiver (contact
F Backup fuse ripple control receiver
G TNC system feed
H Economy tariff meter
Installation sequence
C
5 4
3
kWh
3/N
H
4
open: power-OFF enabled)
97