Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 42

Installation sequence
Electrical connection
Preparing the electrical connections
Cables
For cable lengths and cable cross-sections: See the
■
following tables.
■ For accessories:
Cables with the required number of cores for exter-
nal connections.
Prepare an on-site distribution box.
Cable lengths in the indoor unit
Connection cables
230 V~, e.g. for circulation pumps
■
Note
Route the cables to the HPMU electronics module so they are flex-
ible.
< 42 V, e.g. for sensors
■
Recommended power cables
Indoor unit
Power supply
Control unit/PCB 230 V~
Instantaneous heating water
heater
For central power supply on types ... SP
Power supply
Indoor unit 230 V~
Outdoor units
Power supply
Outdoor unit 230 V~
Outdoor unit 400 V~
42
Without power-OFF
■
With power-OFF
■
400 V~
■
230 V~
■
Cable lengths in the indoor unit
Cable
2
3 x 1.5 mm
5 x 1.5 mm 2
5 x 2.5 mm 2
7 x 2.5 mm 2
Cable
2
3 x 6.0 mm
Cable
3 x 2.5 mm 2
Or
2
3 x 4.0 mm
2
5 x 2.5 mm
1.3 m
1.3 m
Max. cable length
50 m
50 m
25 m
25 m
Max. cable length
30 m
Max. cable length
20 m
32 m
30 m