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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 previously 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 flow temperature of more than 18 °C du-
ring 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 electric heating ele-
ment (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 ventilator and fed via the eva-
porator (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 liquefier (heat
exchanger).
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 eva-
porator is defrosted automatically by the heat pump as required.
Steam may be emitted from the air outlet depending on the at-
mospheric conditions.
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All manuals and user guides at all-guides.com
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. The refri-
gerant 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
3.1
E-3
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