Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors page 19

Electrical connection
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.
Recommended power cables
Power supply
Heat pump control
■
unit 230 V~
■
Compressor 400 V~
Instantaneous heating water heater
400 V~
(cont.)
Cable
Without power-
OFF
With power-OFF
Required cable lengths in the heat pump plus wall
clearance
Cable lengths
■ Required cable length inside the appliance plus dis-
tance to wall:
0.5 m
Height of wall outlet:
■
800 mm: See "Technical guide for heat pumps".
Max. cable length
2
3 x 1.5 mm
2
5 x 1.5 mm
5 x 2.5 mm 2
5 x 2.5 mm 2
Installation sequence
Fuse rating
B16 A
B16 A
25 m B16 A
25 m B16 A
19