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1.4 Energy-Efficient Use of the Heat
Pump
By operating this heat pump you are helping to protect our en-
vironment. Both the heating system and the heat source must
be properly designed and dimensioned to ensure efficient op-
eration. It is particularly important to keep water flow tempera-
tures as low as possible. All connected energy consumers
should therefore be suitable for low flow temperatures. Raising
the heating water temperature by 1 K corresponds to an in-
crease in energy consumption of approx.
2.5 %. Low-temperature heating systems with flow tempera-
tures between 30 °C and 50 °C are particularly well-suited for
energy-efficient operation.
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 newly built or previ-
ously existing heating systems. Water is used as the heat car-
rier. It can be supplied by wells or other water systems.
In order to eliminate the risk of corrosion at 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
manual for heat pumps for heating purposes.
ATTENTION!
!!
The well water must comply with the required water quality
standards.
(see Cap. 9.4 on pag. 10)
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 re-
frigerating circuit.
The refrigerant is drawn in by the electrically driven compres-
sor, compressed and “pumped” to a higher temperature level.
The electrical power needed to run the compressor is not lost in
this process. Most of it is absorbed by the refrigerant as well.
Subsequently, the refrigerant is passed through the condenser
where it transfers its heat energy to the heating water.
Depending on the set operating point (thermostat setting), the
heating water is thus heated up to a max. of 62 °C.
3
Basic Device
The basic device consists of a ready-to-use heat pump for in-
door installation, complete with casing, switch box and inte-
grated Heat pump manager. The refrigeration circuit is "her-
metically sealed" and contains the fluorinated refrigerant
R410A included in the Kyoto protocol. Information on the GWP
value and CO
2
equivalent of the refrigerant can be found in the
chapter Device information. The refrigerant is CFC-free, non-
ozone depleting and non-combustible.
All components required for the operation of the heat pump are
located in the switch box. An external wall temperature sensor
including fixing accessories and a dirt trap are supplied with the
heat pump. The supply for the load current and the control volt-
age must be installed at the building site.
The supply lead of the well pump (to be provided by the cus-
tomer) must be connected to the switch box. It is important to
ensure that the integrated motor protection is sufficient for the
pump provided by the customer.
1) Liquifier
2) Control panel
3) Evaporator
4) Compressor
5) Filter dryer
6) Economizer
7) Expansion valve
