Viessmann VITOCAL 350-A Installation And Service Instructions Manual page 40

Installation sequence
Electrical connections: Control panel
External heat pump
A B C
Fig. 34
Sealing mat (for cable entry from below)
A
Mains terminals
B
Power cable 400 V~ with cable fitting
C
Cable bracket (cables secured with cable ties)
E
Connecting cables with plugs: LV lead (< 42 V)
F
and control cable (230 V~) from the heat pump
control unit
40
(cont.)
E
¨
E F
1. Internal heat pump:
Route the 230 V cables through one cable entry,
and the LV lead through the other cable entry in
the l.h. or r.h. side panel.
External heat pump:
Cut one entry in the sealing mat for the 230 V
cables and a second entry for the LV lead. Route
the cables from below through the sealing mat.
2. Route the cables through the prefitted retainers.
Secure the LV lead and 230 V cables separately.
3. Secure the cables below the front edge of the con-
trol panel with a loop (see previous diagram) to the
cable bracket.
4. Push the connecting lead/cables (LV lead < 42 V
and control cable 230 V~) from the heat pump con-
trol unit into the corresponding plug-in connections
on the distributor PCB inside the control panel.
5. Route 400 V~ power cable through cable fitting
and apply strain relief. Carry out the mains connec-
tion according to page 64.
Note
The 400 V~ power supply is protected against
accidental contact with a contact shield. This con-
tact shield can be sealed for power-OFF (if
required).