Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 33

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.
Note
Make all connections on the control unit panel (see
page 38) with flexible cables to ensure that it can be
placed in the service position (see page 84).
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.
Cable lengths in the indoor/outdoor unit
Cables
Power cables
Other connecting cables
Indoor/outdoor unit bus
cable (flexible data cable)
Recommended flexible power cables
Indoor unit
Power supply
Heat pump control unit 230 V~
Instantaneous heating water
heater
Heat pump control unit
■
230 V~
Compressor 230 V~/
■
400 V~
230 V~, e.g. for circula-
■
tion pumps
< 42 V, e.g. for sensors
■
Modbus
■
Without power-
■
OFF
With power-OFF
■
400 V~
■
230 V~
■
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.
Indoor unit Outdoor unit, types
221.C04 to C08 221.C10 to C16
1.5 m
—
1.5 m
1.1 m
1.1 m
Cable
2
3 x 1.5 mm
2
5 x 1.5 mm
5 x 2.5 mm 2
7 x 2.5 mm 2
Installation sequence
— —
1.2 m 1.9 m
— —
— —
1.2 m 1.9 m
Max. cable length
25 m
25 m
33