Power Supply - Viessmann NC-Box Installation And Service Instructions For Contractors

Installation sequence

Power supply

Isolators for non-earthed conductors
■ Install an isolator in the power cable to provide
omnipolar separation from the mains for all active
conductors, corresponding to overvoltage category
III (3 mm) for full isolation. This isolator must be fitted
in the permanent electrical installation in line with
installation requirements, e.g. mains isolator or
upstream circuit breaker.
■ We additionally recommend installing an AC/DC-
sensitive RCD (RCD class B
currents that can occur with energy efficient equip-
ment.
Class A RCDs must not be used and not installed
■
upstream of the class B RCD.
Connection information
■ The power cable is connected to the NC-Box termi-
nal box and routed to the outside through the cable
entry at the factory.
We recommend connecting NC-Box power supply at
■
the power supply of the heat pump control unit.
Connection to the same fuse provides additional pro-
tection in the case of faults and when the power is
switched off. For this, take the power consumption of
the connected consumer into account (fuse protec-
tion, heat pump control unit, max. 16 A).
Heat pump installation and service instructions
Danger
Incorrect electrical installations can lead to seri-
ous injury from electrical current and result in
appliance damage.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■ IEC 60364-4-41
■ VDE regulations
Technical connection requirements specified
■
by the local power supply utility
Protect the power cable with a fuse/MCB of
■
max. 16 A.
14
) for DC (fault)
Colour coding to IEC 60757
L
N
?
Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
fault.
The appliance and pipework must be connected
to the equipotential bonding of the building.
Danger
Incorrect core assignment can lead to serious
injury from electrical current and result in equip-
ment damage.
Never interchange cores "L" and "N".
BN
BU
GNYE
Brown
Blue
Green/yellow