General
All electrical equipment, except the outdoor sensors,
room sensors and the current sensors are ready connec-
ted at the factory.
• Electrical installation and wiring must be carried out
in accordance with the stipulations in force.
• Disconnect S1255PC before insulation testing the
house wiring.
• If the building is equipped with an earth-fault breaker,
S1255PC should be equipped with a separate one.
• S1255PC must be installed via an isolator switch. The
cable area has to be dimensioned based on the fuse
rating used.
• If a miniature circuit breaker is used, this must have
motor characteristic "C" as a minimum. See section
"Technical specifications" for fuse size.
• To prevent interference, sensor cables to external
connections must not be laid close to high voltage
cables.
• The minimum area of communication and sensor
cables to external connections must be 0.5 mm² up
to 50 m, for example EKKX, LiYY or equivalent.
• Electrical wiring diagram for the heat pump, see sep-
arate Installer Manual.
• When cable routing in S1255PC, the cable grommets
(UB1 and UB2) must be used.
NOTE
Electrical installation and any servicing must
be carried out under the supervision of a quali-
fied electrician. Disconnect the current using
the circuit breaker before carrying out any ser-
vicing.
NOTE
If the supply cable is damaged, only NIBE, its
service representative or similar authorised
person may replace it to prevent any danger
and damage.
NOTE
Check the connections, main voltage and phase
voltage before the machine is started, to pre-
vent damage to the heat pump electronics.
NOTE
Do not start the system before filling up with
water. Components in the system could be
damaged.
MINIATURE CIRCUIT-BREAKER
The operating circuit in S1255PC and some of its internal
components are fused internally by a miniature circuit
breaker (FC1).
S1255PC-6 3x400 V is not equipped with miniature cir-
cuit breakers (FC1).
17Chapter 5 | Electrical connectionsNIBE S1255PC
5 Electrical connections
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