Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 97

Power supply
(cont.)
G Ripple control receiver (contact
open: power-OFF enabled) with
backup fuse
Two-stage (type BW + BWS)
X3.7
A
X3.6
3
D
E
3
kWh
3/N
F
G
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 Control unit power supply
E Mains isolator
B
≈
4
K
Installation sequence
H Economy tariff meter
K TNC system feed
C
5 4
3
kWh
3/N
H
4
F High tariff meter
G Ripple control receiver (contact
open: power-OFF enabled) with
backup fuse
H Economy tariff meter
K TNC system feed
L Heat pump compressor stage 2
(type BWS)
L
4
97