Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 52

Installation sequence
Routing cables to the heat pump wiring chamber
1. Route LV leads through "< 42 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 LV leads and 230 V cables as
far apart as possible.
52
400 V~
230 V~
<42 V
3. Route power cable for compressor
through "400 V" entry to the heat
pump wiring chamber.
Always secure power cables with
strain relief fittings.
Note
Additional strain relief fittings are
required on site, as the wall clearance
is ≥ 80 mm.
For power supply, see from
page 71.
(cont.)