Electrical Connection; Required Connections - Viessmann NC-Box Installation And Service Instructions For Contractors

Installation sequence

Electrical connection

Danger
Damaged wiring insulation wiring can lead to
serious injury from electrical current and result in
appliance 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.
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.

Required connections

Heat pump connecting cable ("NC signal")
Switching signal 230 V~ for switching the NC-Box. The
natural cooling function is activated as soon as this
signal is issued.
Note
The heat pump connecting cable is connected to the
NC-Box terminal box and routed to the outside through
the cable entry at the factory.
12
Danger
Incorrect wire assignment can result in serious
injury and damage to the appliance.
Never interchange cores "L" and "N".
Colour coding to IEC 60757
L BN
N BU
GNYE
?
KM BUS cable
For switching the mixer extension kit in the NC-Box.
Brown
Blue
Green/yellow