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3.1
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 operating instructions of the heat pump manager.
2 Purpose of the heat
pump
2.1 Application
The air-to-water heat pump is to be used exclusively for the hea-
ting of heating water. It can be used in new or already-existing
heating systems.
The heat pump is suitable for mono-energy and bivalent opera-
tion down to an external temperature of -25 °C.
Proper defrosting of the evaporator is guaranteed by maintaining
a heating water return temperature of more than 18 °C during
continuous operation.
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. If a building is to be dried out in
autumn or winter, we recommend installing an additional electric
heating element (available as an accessory).
ATTENTION!
The device is not suitable for operation with a frequency converter.
2.2 Operating principle
Surrounding air is drawn in by the fan and fed through the evapo-
rator (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 brought to a higher temperature level by increasing
its pressure with the aid of the 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 in
the environment to a higher level. As 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, the liquefier and the electrical control sys-
tem.
At low ambient temperatures, humidity accumulates on the eva-
porator in the form of frost, reducing the transfer of heat. 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.
3 Scope of supply
3.1 Basic device
The heat pump is of compact design and is supplied complete
with the components listed below.
The refrigerating circuit contains the Kyoto protocol approved flu-
orinated refrigerant R404A with a GWP value of 3260. It is CFC-
free, non-ozone depleting and non-combustible.
1)
Evaporator
2)
Liquefier
3)
Ventilator
4)
Switch box
5)
Compressor 1
6)
Compressor 2
7)
Filter dryer
8)
Expansion valve
9)
Collector
Summary of Contents for LA 17TU
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