Viessmann Vitocal 222-A - Electrical Connection

31
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.
Note
Make all connections on the control unit panel (see
page 35) with flexible cables to ensure that it can be
placed in the service position (see page 80).
Danger
Damaged wiring insulation wiring can lead to
serious injury from electrical current and result in
appliance damage.
Route cables so that they cannot touch very hot,
vibrating or sharp-edged components.
Danger
Incorrect wiring can lead to serious injury from
electrical current and result in appliance dam-
age.
Take the following measures to prevent drifting
of wires into the adjacent voltage area:
■
Route LV leads < 42 V separately from cables
> 42 V/230 V~/400 V~ and secure with cable
ties.
■
Only strip the minimum of insulation from
cables as close as possible to the terminals
and bundle tightly to the corresponding termi-
nals.
■
If 2 components are connected to the same
terminal, press both cores together in a single
wire ferrule.
Cable lengths in the indoor/outdoor unit
Cables Indoor unit Outdoor unit, types
221.A04 to A08 221.A10 to A16
Power cables
■
Heat pump control unit
230 V~
1.2 m — —
■
Compressor 230 V~/
400 V~
— 1.2 m 1.9 m
Other connecting cables
■
230 V~, e.g. for circula-
tion pumps
1.2 m — —
■
< 42 V, e.g. for sensors 0.8 m — —
Modbus cable for indoor/
outdoor unit (accessories,
15 m or 30 m)
■
Modbus 0.8 m 1.2 m 1.9 m
Recommended flexible power cables
Indoor unit
Power supply Cable Max. cable length
Heat pump control unit
230 V~
■
Without power-OFF
3 x 1.5 mm
2
■
With power-OFF
5 x 1.5 mm
2
Instantaneous heating water
heater
■
400 V~
5 x 2.5 mm
2
25 m
■
230 V~
7 x 2.5 mm
2
25 m
Installation sequence
Electrical connection
5831412
Installation