Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 94

Installation sequence
Power supply
Single stage (type BW)
A
3
3
kWh
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 (type BW)
D High tariff meter
94
(cont.)
X3.7
X3.6
≈
E
F
G
B
C
5
3
kWh
3/N
H
4
4
E Ripple control receiver (contact
open: power-OFF enabled)
F Backup fuse ripple control receiver
G TNC system feed
H Economy tariff meter
4