Nibe S2125, Installer Manual, Page: 30 / 64

Preparations
Caution
Check the miniature circuit-breaker (FC1). It could
have tripped during transport.
NOTE
Do not start S2125 if there is a risk that the water
in the system has frozen.
COMPRESSOR HEATER
S2125 is equipped with a compressor heater that heats the
compressor before start-up and when the compressor is
cold.
Compressor heater (EB10) is activated when the heat pump
is connected to the supply voltage. The compressor needs
to be heated up before starting for the first time. From the
time the indoor module/control module is connected and a
heating demand arises, it may take a while before the com-
pressor reaches the permitted start value.
NOTE
The compressor heater must have been active for
a while, prior to starting for the first time, until the
discharge sensor (BT14) has reached its set tem-
perature, see section “Start-up and inspection”.
Filling and venting
Fill the heating system to the necessary pressure. The heat
pump is equpped with an automatic venting valve, which
closes when the heat pump is filled with liquid.
Start-up and inspection
1. Communication cable must be connected.
2. If cooling operation with S2125 is wanted, DIP switch S1
position 4 must be changed according to the description
in section "Cooling".
3. Turn the isolator switch on.
4. Ensure that the S2125 is connected to the power source.
5. Check that fuse (FC1) is on.
6. Reinstall the removed panels and cover.
7. After the power to S2125 has been switched on, and
there is a compressor demand from the indoor mod-
ule/control module, the compressor starts once it has
warmed up.
8. Adjust the charge flow according to size. Also see sec-
tion “Adjustment, charge flow”.
9. Adjust menu settings via the indoor module/control
module as necessary.
10. Fill in "Inspection of the installation", in section "Import-
ant information".
NOTE
The live external control must be taken into con-
sideration when connecting.
Post adjustment and venting
Air is initially released from the hot water and venting may
be necessary. If bubbling sounds can be heard from the heat
pump, the charge pump or radiators, the entire system re-
quires further venting. When the system has stabilised
(correct pressure and all air eliminated), the automatic
heating control system can be set as required.
NIBE S2125 Chapter 6 | Commissioning and adjusting 30
Commissioning and adjusting