Electrical Connection Requirements - Viessmann Vitocal 300-G Pro Series Installation And Service Instructions For Contractors

Installation sequence
Power supply
(cont.)

Electrical connection requirements

Note
The type and cross-section of connecting cables must
be determined by an authorised electrician in accord-
ance with the local regulations.
Fuses
Type Main cable
BW 302.D090
BW 302.D110
BW 302.D140
BW 302.D180
BW 302.D230
Power supply with power-OFF without on-site load disconnect (delivered condition)
The power-OFF signal is connected directly to the heat
pump control unit via floating contact. The compres-
sors are shut down when power-OFF is enabled.
Parameter "Output for instant. heating water heater
at power-OFF 790A" determines whether and at what
stage an instantaneous heating water heater (if instal-
led) remains operational during power-OFF.
Note
Observe the technical connection conditions of the rel-
evant power supply utility.
46
Control cable
100 A 25 A
125 A 25 A
125 A 25 A
160 A 25 A
200 A 25 A
Note
The control circuit power supply and the cable for the
power-OFF signal can be combined in a single 5-core
cable.
Cable lengths in the heat pump plus distance to
wall
Control circuit power supply (230 V~ if on
site)
Power circuit power supply (400 V~)
Additional connecting cables
X3.7
A
X3.6
3
D
3
G
kWh
E
3/N
F
4
Fig. 34 Diagram excluding MCB/fuses and RCD
Heat pump control unit
A
B Instantaneous heating water heater
Compressor
C
Heat pump control unit power supply
D
Premium tariff meter
E
F Backup fuse, ripple control receiver
Ripple control receiver (contact open: power-OFF
G
enabled) TNC system feed
Economy tariff meter
H
Feed in: TNC system
K
3 m
3 m
2 m
B
C
5
3
kWh
3/N
H
4
4
K
4