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1.4 Energy-Efficient Use of the
Heat Pump
With the purchase of this heat pump you are helping to protect
the environment. A prerequisite for energy-efficient operation is
the correct design of the heat source system and heating system
(radiators and circulation pump).
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 de-
sign the heat source and heating system very carefully. A tem-
perature difference of approx. one Kelvin increases the
power consumption by around 2.5 %. When designing the
heating system, it should be borne in mind that special consum-
ers such as e.g. 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 because this increases the tempera-
ture difference, in turn reducing the COP.
Correct adjustment of the heat pump manager is also important
for energy-efficient use of the heat pump. Further information can
be found in the heat pump manager's operating instructions.
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Purpose of the Heat
Pump
2.1 Application
The air-to-water heat pump is to be used exclusively for the heat-
ing of heating water. It can be used in newly built or previously
existing heating systems.
The heat pump is suitable for mono energy and bivalent opera-
tion down to an external temperature of -20 °C.
Proper defrosting of the evaporator is guaranteed by maintaining
a heating water return flow temperature of more than 13 °C dur-
ing continuous operation.
The heat pump is not designed for the increased heat consump-
tion required when a building is being dried out. The additional
heat consumption should be met using special devices provided
by the customer. If a building is to be dried out in autumn or win-
ter, we recommend installing an additional heating element
(available as an accessory).
NOTE
The device is not suitable for operation with a frequency converter.
2.2 Operating Principle
Surrounding air is drawn in by the ventilator and fed via the evap-
orator (heat exchanger). The evaporator cools the air, i.e. it ex-
tracts heat from it. This extracted heat is then transferred to the
working medium (refrigerant) in the evaporator.
The heat is "pumped" to a higher temperature level by increasing
its pressure with the aid of the electrically driven compressors. It
is then transferred to the heating water using the liquifier (heat
exchanger).
Electrical energy is used to raise the temperature of the heat in
the environment to a higher level. Because the energy extracted
from the air is transferred to the heating water, this type of device
is called an air-to-water heat pump.
The air-to-water heat pump consists of the main components
evaporator, ventilator and expansion valve, as well as the low-
noise compressors, liquifier and 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. Steam may be emitted from the air outlet depending on
the atmospheric conditions.
452159.66.04 · FD 9202
LA 17PS - LA 26PS
EN-3
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