Electrical Connections; Routing Cables To The Heat Pump Wiring Chamber - Viessmann Vitocal 300-G Pro Installation And Service Instructions For Contractors

Installation sequence

Electrical connections

Routing cables to the heat pump wiring chamber

Danger
Damaged wiring insulation can lead to serious
injury from electrical current and result in appli-
ance 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.
■ Route LV leads < 50 V separately from cables
> 50 V/230 V~/400 V~.
Only strip the minimum of insulation from
■
cables, as close to the terminals as possible,
and bundle them close 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. 22
1. Route LV leads through "< 50 V" entry to heat
pump wiring chamber.
2. Route 230 V cables through the "230 V~" entry to
the heat pump wiring chamber.
Secure 230 V cables with cable ties.
Note
Route LV leads and 230/400 V cables as far apart
as possible.
30
When routing the on-site cables, note the location of
the cable entries into the appliance on the back panel.
400 V~
230 V~
<50 V
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
Additional strain relief fittings are required on site,
as the wall clearance is ≥ 80 mm.
For power supply, see from page 45.