Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 95

Power supply
(cont.)
Two-stage (type BW + BWS)
X3.7
A
X3.6
3
3
kWh
E
3/N
D
F
4
Shown excluding fuses and RCD
A Heat pump control unit (connection
on cross connect PCB)
B Instantaneous heating water heater
(on site)
C Heat pump compressor stage 1
(type BW)
D High tariff meter
B
5
≈
kWh
3/N
4
G
Installation sequence
C
4
3
H
4
E Ripple control receiver (contact
open: power-OFF enabled)
F Backup fuse ripple control receiver
G TNC system feed
H Economy tariff meter
K Heat pump compressor stage 2
(type BWS)
K
4
95