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HPL 6S-TU(R)W
1.4 Energy-efficient use of the heat
pump
By operating this heat pump, you are helping to protect the envi-
ronment. A prerequisite for energy-efficient operation is the cor-
rect design of the heat source system and heating system.
It is particularly important for the efficiency of a heat pump to
keep the temperature difference between heating water and heat
source as small as possible. For this reason, it is advisable to
design the heat source and heating system very carefully. A tem-
peraturedifference of approximately one Kelvin (1 °C) in-
creases the power consumption by around 2.5 %. When de-
signing the heating system, it should be borne in mind that
special consumers such as domestic hot water preparation
should also be taken into consideration and dimensioned for low
temperatures. Underfloor heating systems (panel heating)
are optimally suited for heat pump use on account of the low flow
temperatures (30 °C to 40 °C).
It is important to ensure that the heat exchangers are not con-
taminated during operation, as this increases the temperature
difference, which in turn reduces the COP.
When set correctly, the heat pump manager is also an essential
factor in the energy-efficient use of the heat pump. Further infor-
mation can be found in the heat pump manager operating in-
structions.
2
Intended use of the heat
pump
2.1 Area of application
The air-to-water heat pump is intended exclusively for heating or,
depending on the device, also cooling heating water. It can be
used in new or existing heating systems.
The heat pump is suitable for mono energy and bivalent opera-
tion.
During continuous operation, proper defrosting of the evaporator
must be guaranteed by maintaining a heating water return
temperature of more than 18 °C.
The heat pump is not designed for the increased heat consump-
tion required when a building is being dried out. For this reason,
the additional heat consumption should be met using special de-
vices provided by the customer. For drying out a building in au-
tumn or winter, it is advisable to install a second heat generator
(e.g. an electric heating element available as an accessory).
NOTE
The device is not suitable for operation with a frequency converter.
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2.2 Operating principle
Heating
Surrounding air is drawn in by the fan and fed through the evap-
orator (heat exchanger). The evaporator cools the air, i.e. ex-
tracts heat from it. This extracted heat is then transferred to the
working medium (refrigerant) in the evaporator.
The heat is brought to a higher temperature level by increasing
its pressure with the aid of an electrically driven compressor. It is
then transferred to the heating water via the liquefier (heat ex-
changer).
Electrical energy is used to raise the temperature of the heat
from the environment to a higher level. Because the energy ex-
tracted from the air is transferred to the heating water, this type
of device is referred to as an air-to-water heat pump.
The main components of an air-to-water heat pump are the evap-
orator, fan and expansion valve, as well as the low-noise com-
pressor, liquefier and the electrical control system.
At low ambient temperatures, humidity accumulates on the evap-
orator in the form of frost, reducing the transfer of heat. Uneven
accumulation during this process does not indicate a fault. The
evaporator is defrosted automatically by the heat pump as re-
quired. Under certain atmospheric conditions, steam may be
emitted from the air outlet.
Cooling (device-dependent)
The functions of the evaporator and the liquefier are reversed in
the "Cooling" operating mode.
The heating water transfers its heat to the refrigerant via the liq-
uefier, which is now functioning as an evaporator. The refrigerant
is brought to a higher temperature level using the compressor.
Heat is transferred to the surrounding air via the liquefier (which,
in heating operation, functions as an evaporator).
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