Electrical Connections - Viessmann Vitocal 300-G Pro Series Installation And Service Instructions For Contractors

Installation sequence

Electrical connections

Routing cables to the heat pump wiring chamber
Danger
Damaged cable insulation can cause injury and
damage to the appliance.
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.
■ Route extra low voltage (ELV) leads < 50 V
separately from cables
Strip the cables of a small amount of insulation
■
close to the terminals and bundle tightly to the
corresponding terminals.
■ Secure cables with cable ties/strain relief fit-
tings.
This ensures that, in the event of a fault, e.g. if a
wire becomes detached, the wires cannot drift
into the adjacent voltage area.
Fig. 27
1. Route LV leads through "< 50 V" entry to heat
pump wiring chamber.
2. Route 230 V cables through "230 V" entry to heat
pump wiring chamber.
Secure 230 V cables with cable ties.
Note
Route extra low voltage (ELV) leads and 230 V
cables far apart.
30
50 V/230 V~/400 V~.
>
400 V~
230 V~
<50 V
When routing the on-site cables, note the location of
the cable entries into the appliance on the back panel.
See page 25.
3. Route power cable for compressor through "400 V"
entry to the heat pump wiring chamber.
Always secure the power cable with strain relief fit-
tings.
Note
On-site strain relief fittings are required since the
wall clearance is ≥ 80 mm.
For power supply, see from page 45.