Start-up and
inspection
START-UP WITH COMPATIBLE HEAT PUMP
NOTE
At cold outdoor temperatures and when the
exhaust air fan in the compatible heat pump is
running, NIBE FLM must not be deactivated
or switched off using the mains plug. This
creates a risk of NIBE FLM freezing.
1.
Set the main switch (SF1) and the switch for the
circulation pump (SF2) on NIBE FLM to position "1".
2.
Set the heat pump's switch (SF1) to " ".
3.
Follow the instructions in the start guide in the heat
pump display. If the start guide does not start when
you start the heat pump, start it manually in menu
5.7.
4.
Check that the fan (GQ2) and circulation pump (GP2)
are running.
Starting-up with ventilation only
In cases where NIBE FLM is to be run with ventilation
only, e.g. before the brine side is ready for connection.
In this mode the circulation pump must be switched off.
1.
Follow points 1-4 under “Starting with NIBE heat
pumps”, but leave the switch for circulation pump
(SF2) in "0" mode.
2.
When the brine side is connected, the switch for
circulation pump (SF2) is set to mode "1".
Commissioning with a compatible heat pump
The first time the heat pump is started a start guide is
started. The start guide instructions state what needs
to carried out at the first start together with a run
through of the heat pump’s basic settings.
The start guide ensures that start-up is carried out cor-
rectly and cannot be bypassed. The start guide can be
started later in menu 5.7.
The brine flow over NIBE FLM is regulated by the circu-
lation pump (GP2) and trim valve (RN1) so that the
temperature difference on brine in and out from NIBE
FLM is 2–4°C. The temperature is measured using ex-
ternal test equipment.
Adjustments are made when the heat pump is in oper-
ation. Temperature difference applies at 20 °C room
temperature and 0 °C in the brine.
The brine flow through NIBE FLM will be from 0.1 l/s
(360 l/h) to 0.15 l/s (540 l/h) at the above temperature
difference, depending on the ventilation flow.
When the heat pump is at a standstill, the internal circu-
lation pump in NIBE FLM gives from 0.085 l/s (306 l/h)
to 0.125 l/s (450 l/h) in the return charging flow to the
collector.
This applies to a heat pump with approximately 4 kW
rated output.
For a 15 kW heat pump, the corresponding flow is from
0.09 l/s (324 l/h) to 0.14 l/s (504 l/h).
Caution
As long as the start guide is active, no function
in the installation will start automatically.
The guide will appear at each installation restart
until it is deselected on the last page.
23Chapter 6 | Commissioning and adjustingNIBE FLM
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