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Electrical connections
General
All electrical equipment, except the outdoor sensors, room
sensors and the current sensors are ready connected at the
factory.
•
Electrical installation and wiring must be carried out in
accordance with national provisions.
•
Disconnect S1256 before insulation testing the house
wiring.
•
If the building is equipped with an earth-fault breaker,
S1256 should be equipped with a separate one.
•
S1256 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 at
least triggering characteristic "C". See section "Technical
specifications" for fuse size.
•
To prevent interference, sensor cables to external connec-
tions 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 S1256, see separate handbook
(WHB).
•
When routing a cable into S1256, the cable grommets (UB1)
and (UB2) must be used.
NOTE
Electrical installation and any servicing must be
carried out under the supervision of a qualified
electrician. Disconnect the current using the cir-
cuit breaker before carrying out any servicing.
20
Chapter 5 | Electrical connections
UB1
UB2
FC1
NOTE
If the supply cable is damaged, only NIBE, its ser-
vice 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 product is started, to prevent
damage to the heat pump electronics.
NOTE
Do not start the system before filling up with wa-
ter. Components in the system could be damaged.
MINIATURE CIRCUIT-BREAKER
The operating circuit in S1256 and some of its internal
components are fused internally by a miniature circuit
breaker (FC1).
S1256-8 3x400 V is not equipped with miniature circuit
breakers (FC1).
NIBE S1256
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