Brine Side - Nibe F1345 Installer Manual

Brine side

Collector
Type Surface soil heat, re-
commended collect-
or length (m)
24 kW 3x350-4x400
30 kW 3x450-4x450
40 kW 4x500-6x500
60 kW 6x450-8x450
Applies to PEM hose 40x2.4 PN 6.3.
These are rough example values. At installation the cor-
rect calculations must be made according to local condi-
tions.
Caution
The length of the collector hose varies depend-
ing on the rock/soil conditions, climate zone
and on the climate system (radiators or under-
floor heating).
Max length per coil for the collector should not exceed
500 m.
The collectors must always be connected in parallel with
the possibility of adjusting the flow for the relevant coil.
For surface soil heat, the hose should be buried at a
depth determined by local conditions and the distance
between the hoses should be at least 1 metre.
For several bore holes, the distance between the holes
must be determined according to local conditions.
Ensure the collector hose rises constantly towards the
heat pump to avoid air pockets. If this is not possible,
airvents should be used.
Because the temperature of the brine system may fall
below 0 °C, it must be protected against freezing down
to -15 °C. When making the volume calculation, 1 litre
of ready mixed brine per meter of collector hose (applies
when using PEM-hose 40x2.4 PN 6.3) is used as a guide
value.
Caution
Because the temperature of the brine system
varies depending on the heat source, the 5.1.7
"br pmp al set." menu must be set to a suitable
value.
NIBE F1345
Rock heat, recom-
mended active
drilling depth (m)
2x180-3x180
3x150-5x150
4x170-5x200
6x150-8x180
Connecting the brine side
The pipe connections are on the rear of the heat pump.
■
Insulate all indoor brine pipes against condensation.
■
NOTE
Condensation may drip from the expansion
vessel. Position the vessel so that this does not
harm other equipment.
Caution
When necessary you should install venting
valves in the brine system.
Mark the brine system with the antifreeze that is used.
■
Install the supplied safety valve at the expansion vessel
■
as illustrated in the outline diagram. The entire length
of the overflow water pipe from the safety valves must
be inclined to prevent water pockets and must also be
frost-free.
Install shut off valves as close to the heat pump as
■
possible so that the flow to individual cooling modules
can be shut off. Extra safety valves between the particle
filter and shut off valves (according the outline dia-
gram) are required.
Fit the supplied particle filter on the incoming pipe.
■
Fit the supplied non-return valves on the outgoing
■
pipe.
In the case of connection to an open groundwater sys-
tem, an intermediate frost-protected circuit must be
provided, because of the risk of dirt and freezing in the
evaporator. This requires an extra heat exchanger.
P
Chapter 4 | Pipe connections 17