Technical data
40 | Project planning manual for heat pumps for heating and domestic hot water preparation | 01.2012 www.dimplex.de
3.2.5 Brine-to-water heat pump
The main breather with micro-bubble separator should be posi-
tioned at the highest and warmest point in the brine circuit. The
equipment for the brine circuit can be installed either inside or
outside the building.
NOTE
The brine circuit cable and fixtures must be fitted with diffusion-proof in-
sulation. The function of the individual components must not be re-
stricted.
NOTE
The dirt trap included in the scope of supply of the heat pump (mesh size
0.6 mm) protects the evaporator of the heat pump; it should be installed
directly in the heat pump inflow and be cleaned after a brine circulating
pump flush cycle of approx. 1 day.
NOTE
Insulating materials that do not absorb any moisture should be used to
prevent the insulation from becoming soaked. The joints should also be
glued so that no moisture can penetrate through to the cold side (e.g.
brine pipe) of the insulation.
The following brine accessories packages are available:
Table 3.4: Brine accessory packages for different heat pumps
NOTE
The brine accessory packages SZB 140E to SZB 220E include an elec-
tronically controlled brine circulating pump, which can be activated by
the heat pump manager WPM EconPlus via a 0 - 10 V signal.
ATTENTION!
For borehole heat exchangers, the free compressions specified in the
device information must be taken into account (max. heat exchanger
depth for DN 32 is 80 m).
Insufficient brine solution and leakage
A "low-pressure switch" (available as an accessory) can be in-
stalled in the brine circuit to diagnose a lack of fluid, a leakage in
the brine circuit or to comply with the regulations of the local au-
thorities. In the event of a drop in pressure, the low-pressure
switch sends a signal to the heat pump manager, which is then
either indicated in the display or blocks the heat pump.
1) Section of pipe with internal and external threads
2) Pressure switch with connector and connector seal
Fig. 3.10: Low-pressure switch for the brine circuit (assembly and wiring)
The piece of pipe shown in the drawing must be installed in the
brine circuit between the cap valve and the expansion vessel.
The pressure switch must be connected to the connecting stub
on the section of pipe. The cap valve with shut-off function ena-
bles the low-pressure switch to be installed and removed easily
and checked for correct function. When carrying out the function
check on the low-pressure switch, hold the drain valve open until
the pressure switch shuts off the heat pump manager and the
heat pump via a digital signal in response to the pressure drop in
the brine circuit. Catch the brine fluid in a suitable container. If the
low-pressure switch does not shut off the heat pump during obvi-
ous pressure drop, the function of the sensor should be checked
and the sensor replaced if necessary. Once the check is com-
plete, fill the brine circuit again with the collected brine fluid Then
check the brine circuit for leaks and check the function of the heat
pump.
Brine
accessories
package
Heat pump
Circulating
pump
SZB 140E SI 6 - 14TU Stratos 25/1-8
SZB 180E SI 18TU Stratos 30/1-8
SZB 220E SI 22TU Stratos 30/1-12
SZB 250
SI 24TE
SIH 2TE
Top-S 40/10
SZB 300 SI 30TE Top-S 40/10
SZB 400
SI 37TE
SIH 40TE
Top-S 40/10
SZB 500 SI 50TE Top-S 50/10
SZB 680
SI 6 - 11TE
SI(H) 6 - 11TE
Top-S 25/7.5
SZB 700 SI 17TE Top-S 30/10
SZB 750 Si 75TE Top-S 65/13
SZB 1000 SI 100TE Top-S 65/13
SZB 1300 SI 130TE Top-S 65/15
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