Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 63

Power supply
(cont.)
?
N
L3
L
N ?
2
1
L2
L1
Fig. 53
Types
All types
Power supply with power-OFF: Without on-site load disconnect
The power-OFF signal is connected directly into
the 230 V~ junction box of the indoor unit; with heat
pump cascades the connection is only made at the
lead heat pump.
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".
Cable
5 x 2.5 mm
Recommended power cable: H07RN-F
■
The use of PVC cable is not permissible.
■ Do not use wire ferrules.
The PE wire must be longer than the L1, L2, L3 and
N wires.
Shield the power cable from direct sunlight.
■
Max. cable length
30 m
2
Note
Observe the technical connection requirements of the
relevant power supply utility.
Installation sequence
Max. fuse rating
B16A
63