Technical data

www.dimplex.de 01.2012 | Project planning manual for heat pumps for heating and domestic hot water preparation | 39
Brine-to-water heat pump 3.2.5
 If the brine circuit manifolds are mounted inside a building,
the manifolds and all pipes running through the house and
through the wall of the house should be insulated with
steam-resistant material to prevent the formation of conden-
sation.
 The collector pipe in each collector circuit should be no
longer than 100 m and DN 32 heat exchanger pipes should
be no deeper than 80 m, as pressure drops will otherwise
occur.
NOTE
When installing brine circuits of equal length, hydraulic equalisation is
not necessary.
Fig. 3.8: Heat pump circuit on the heat source side
3.2.5 Installation of the brine circuit
 Every brine circuit should be provided with at least one iso-
lating valve.
 Brine circuits must all be of the same length to ensure that
each has an equal flow and abstraction capacity.
 Ground heat collectors should preferably be installed some
months before the start of the heating season to allow the
earth to settle.
 The minimum bend radii as stipulated by the pipe manufac-
turer should be observed.
 The filling and ventilation system should be installed at the
site's highest point.
 All the brine circuit pipes that run through the walls of the
house should be insulated with steam-resistant material to
prevent the formation of condensation.
 All brine-bearing pipes must be made of corrosion-resistant
material.
 The brine circuit manifold and the return collector must be in-
stalled outside the house.
 When installing the brine circulating pump of the heat source
system, the range of operating temperatures of the pump
listed in the installation instructions must be taken into ac-
count. The pump head position must be set in such a way
that no condensation can flow into the connection box.
When installing inside a building, the pump should be insu-
lated with steam-resistant material to prevent the formation
of condensation and ice. Sound insulating measures may
also be necessary.
 The installation clearance between brine-bearing pipes and
water pipes, sewers and buildings should be at least 0,7 m
to prevent frost damage. If this clearance cannot be ensured
for constructional reasons, the pipes should be sufficiently
insulated in the affected area.
 Nothing should be built on top of ground heat collectors, nor
should the surface be sealed in.
NOTE
If the brine circulating pump is installed outdoors, steam-resistant insula-
tion to protect against condensation is not required.
Fig. 3.9: Set-up of the brine circuit inlet pipe including fixtures
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Legend
1) Bracket
2) T-joint
3) Reducing nipple
4) Double nipple
5) Pump connection valve
6) Seal
7) Circulating pump
8) Double nipple
9) Main breather
10) Double nipple
11) Vessel connection assembly with
quick ventilation, safety valve,
pressure gauge
12) Expansion vessel
13) Cap valve with shut-off function
14) Low pressure switch
15) Filter insert
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