Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 64

Installation sequence
Power supply
(cont.)
143.4
A
143.1
40
3
D
≈
3
kWh
E G
3/N
F
4
K
Fig. 54 Diagram excluding fuses and RCD
230 V~ junction box
A
Instantaneous heating water heater
B
Power supply with power-OFF: With on-site load disconnect
The power-OFF signal is connected to the on-site con-
tactor for economy tariff power supply and in the
indoor unit 230 V~ junction box.
With heat pump cascades, the power-OFF signal must
be connected to all heat pumps in parallel and in the
same phase. An additional contactor relay is required
for this.
The compressor and instantaneous heating water
heater are "forced" off when power-OFF is enabled.
Electrical connections of the power supply:
Heat pump control unit and instantaneous heating
■
water heater:
Indoor unit 230 V~ junction box: See chapter "Junc-
tion box: 230 V~ components and switching con-
tacts", "Heat pump control unit power supply" and
"Instantaneous heating water heater power supply".
Compressor:
■
Outdoor unit: See chapter "Compressor power sup-
ply".
Note
Observe the technical connection requirements of the
relevant power supply utility.
64
B
C
5 (400 V~) 3 (230 V~)
7 (230 V~) 5 (400 V~)
3
kWh
3/N
H
4
4
Heat pump compressor
C
D Heat pump control unit power supply
Premium tariff meter
E
Ripple control receiver backup fuse
F
Ripple control receiver (contact open: Power-OFF
G
enabled); feed: TNC system
Economy tariff meter
H
Feed: TNC system
K
143.4
A
143.1
40
3
D
L
≈
3
kWh
3/N
E G
F
4
4
K
Fig. 55 Diagram excluding fuses and RCD
230 V~ junction box
A
Instantaneous heating water heater
B
Heat pump compressor
C
Heat pump control unit power supply
D
Premium tariff meter
E
Ripple control receiver backup fuse
F
Ripple control receiver (contact open: Power-OFF
G
enabled) with backup fuse
Economy tariff meter
H
Feed: TNC system
K
Mains isolator
L
C
B
5 (400 V~) 3 (230 V~)
7 (230 V~)
5 (400 V~)
3
kWh
3/N
H
4