Viessmann Vitocal 252-A Series - Preparing the Electrical Connections

61
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 Cable lengths in the indoor unit
■
230 V~, e.g. for circulation pumps
Note
Route the cables to the HPMU electronics module so they are flex-
ible.
1.3 m
■
< 42 V, e.g. for sensors 1.3 m
Recommended power cables
Indoor unit
Power supply Cable Max. cable length
Control unit/PCB 230 V~
■
Without power-OFF
3 x 1.5 mm
2
50 m
■
With power-OFF
5 x 1.5 mm
2
50 m
Instantaneous heating water heater
400 V~
■
2-phase
5 x 2.5 mm
2
25 m
■
3-phase
5 x 2.5 mm
2
25 m
230 V~
■
1-phase
3 x 2.5 mm
2
25 m
■
2-phase in the 3-phase network
5 x 2.5 mm
2
25 m
■
2-phase in the 1-phase network
7 x 2.5 mm
2
25 m
■
3-phase
7 x 2.5 mm
2
25 m
Heat pumps with central power supply (types ... SP)
Power supply Cable Max. cable length
Indoor unit 230 V~
3 x 6.0 mm
2
30 m
Outdoor units
Power supply Cable Max. cable length
Outdoor unit 230 V~
3 x 2.5 mm
2
20 m
Or
3 x 4.0 mm
2
32 m
Outdoor unit 400 V~
5 x 2.5 mm
2
30 m
Electrical connections
Preparing the electrical connections
6222080
Installation