General
• Electrical installation and wiring must be carried out
in accordance with national provisions.
• Disconnect S2125 before insulation testing the house
wiring.
• If a miniature circuit breaker is used, this must have
motor characteristic "C" as a minimum. See section
"Technical specifications" for fuse size.
• If the building is equipped with an RCD, S2125 must
be equipped with a separate one.
• S2125 must be installed via an isolator switch. The
cable area has to be dimensioned based on the fuse
rating used.
The RCD should have a nominal tripping current of no
more than 30 mA. The incoming supply must be 400V
3N~ 50Hz via an electrical distribution unit with fuses.
For 230V~ 50Hz, the incoming supply must be 230V~
50Hz via distribution box with fuses.
• The routing of cables for heavy current and signals
should be made out through the cable glands on the
heat pump's right-hand side, seen from the front.
• The communication cable must be a screened cable
with three conductors.
• Connect the charge pump to the control module. See
where the charge pump is to be connected in the In-
staller Manual for your control module.
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
Check the connections, main voltage and phase
voltage before the product is started, to pre-
vent damage to the heat pump electronics.
NOTE
The live external control must be taken into
consideration when connecting.
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
Do not start the system before filling up with
water. Components in the system could be
damaged.
NOTE
To prevent interference, sensor cables to ex-
ternal connections must not be laid close to
high voltage cables.
Accessibility, electrical
connection
See section "Removing the side panel and top panel".
25Chapter 5 | Electrical connectionsNIBE S2125
5 Electrical connections
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