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2
Purpose of the heat
pump
2.1 Application
The water-to-water heat pump is to be used exclusively for the
heating of heating water. It can be used in new or already-exis-
ting heating systems. Water is used as the heat transfer medium.
This can be supplied from wells or other similar water systems.
Normally, an intermediate circuit must be provided. If a system is
to be operated without an intermediate circuit, a water analysis
must be carried out, irrespective of the legal stipulations, in order
to establish conclusively whether the ground water is compatible
with the heat pump's evaporator (compare "Heat pumps for hea-
ting purposes" project planning and installation manual).
Neither frost nor temperatures higher than 25°C must occur in
the installation location at any time of the year.
In order to eliminate the risk of corrosion on the evaporator, the
well water must be evaluated regarding the corrosion behaviour
of metallic materials according to DIN 50930.
Details can be found in the project planning and installation ma-
nual for heat pumps for heating purposes.
ATTENTION!
The well water must comply with the required water quality standards.
2.2 Operating principle
A well pump conveys the water to the evaporator of the heat
pump. There, the heat is transferred to the refrigerant in the refri-
gerating circuit.
The refrigerant is drawn in by the electrically driven compressor,
compressed and "pumped" to a higher temperature level. The
electrical operating power supplied during this process is not lost;
rather it is also mostly absorbed by the refrigerant.
The refrigerant is subsequently passed through the liquefier,
where it in turn transfers its heat energy to the heating water.
The heating water is heated, depending on the operating point,
to a maximum of 58 °C ± 2K.
2.3 Functional description for
integrated thermal energy
metering
The compressor manufacturer's performance specifications for
different pressure levels are stored in the heat pump software.
Two additional pressure sensors for determining the current
pressure level are installed in the refrigerating circuit, one before
and one after the compressor. The current heat output can be
calculated from the compressor data stored in the software and
the current pressure level. The integral for the heat output over
the runtime gives the quantity of thermal energy supplied by the
heat pump, which is displayed separately for heating, domestic
hot water preparation and swimming pool water preparation on
the controller's display.
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3
Scope of supply
3.1 Basic device
The basic device consists of a ready-to-use heat pump for indoor
installation, complete with sheet metal casing, control panel and
integrated controller. The refrigerant circuit is hermetically
sealed. It contains the Kyoto protocol approved refrigerant
R404Aa with a GWP value of 3260. It is CFC-free, does not de-
plete ozone and is non-flammable.
All components required for the operation of the heat pump are
located in the control box. A sensor for the external wall temper-
ature including mounting hardware as well as a strainer are sup-
plied with the heat pump. The voltage supply for the load and
control current must be provided by the customer.
The control wire of the brine pump (to be provided by the cus-
tomer) is to be connected to the control box. When so doing, a
motor protecting device is to be installed, if required.
The collector including the brine manifold must be provided by
the customer.
1)
Control
2)
Evaporator
3)
Liquefier
4)
Compressor
5)
Transport securing devices
6)
Filter drier
3.1
E-3
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